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</head>

<body lang=3DEN-US link=3Dblue vlink=3Dpurple style=3D'tab-interval:.5in'>

<div class=3DSection1>

<h1>Robustness of a Reflective Solar Cooker</h1>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><b style=3D=
'mso-bidi-font-weight:
normal'><span style=3D'font-size:14.0pt;mso-bidi-font-size:10.0pt'><o:p>&nb=
sp;</o:p></span></b></p>

<h2><i style=3D'mso-bidi-font-style:normal'>Li-Yan Zhu and Yun K. Ki</i><st=
1:PersonName><i
 style=3D'mso-bidi-font-style:normal'>m</i></st1:PersonName><i style=3D'mso=
-bidi-font-style:
normal'><o:p></o:p></i></h2>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></p>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></p>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>Introduction<o:p></o:p=
></span></b></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>In the spring of 2002, we described a parabolic solar
cooker for unattended cooking [1]. It cooks at a substantially constant pow=
er
for two hours without adjust<st1:PersonName>m</st1:PersonName>ent. This rob=
ust
design is based on three techniques: a te<st1:PersonName>m</st1:PersonName>=
plate
for ai<st1:PersonName>m</st1:PersonName>ing ahead of the sun [2]; a dark pot
with suitable depth; and a reflector opti<st1:PersonName>m</st1:PersonName>=
ized
for <i>angular tolerance</i>.<span style=3D'mso-spacerun:yes'>&nbsp; </span=
>The
last two techniques will be explained in this article.</p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText>The angular tolerance of an infinitesi<st1:PersonNam=
e>m</st1:PersonName>ally
s<st1:PersonName>m</st1:PersonName>all reflecting surface is the acceptable
range of its orientation.<span style=3D'mso-spacerun:yes'>&nbsp; </span>It
characterizes the robustness of a reflecting surface against <st1:PersonNam=
e>m</st1:PersonName>anufacturing
tolerance and solar <st1:PersonName>m</st1:PersonName>ove<st1:PersonName>m<=
/st1:PersonName>ent.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The angular tolerance is not unifo=
r<st1:PersonName>m</st1:PersonName>
over the entire reflector.<span style=3D'mso-spacerun:yes'>&nbsp; </span>It=
 is
usually <st1:PersonName>m</st1:PersonName>ost stringent at the ri<st1:Perso=
nName>m</st1:PersonName>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Obviously, the tolerance can be
increased by <st1:PersonName>m</st1:PersonName>aking the reflector s<st1:Pe=
rsonName>m</st1:PersonName>aller,
or <st1:PersonName>m</st1:PersonName>aking the cookware bigger.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>In either case the <i>gain</i>, de=
fined
as the ratio of cooking power with and without the reflector, is reduced.<s=
pan
style=3D'mso-spacerun:yes'>&nbsp; </span>Our objective is to <st1:PersonNam=
e>m</st1:PersonName>axi<st1:PersonName>m</st1:PersonName>ize
the gain while achieving the desired angular tolerance.</p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt'>This
objective will be acco</span><st1:PersonName><span style=3D'font-size:12.0p=
t;
 mso-bidi-font-size:10.0pt'>m</span></st1:PersonName><span style=3D'font-si=
ze:
12.0pt;mso-bidi-font-size:10.0pt'>plished by opti</span><st1:PersonName><sp=
an
 style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></st1:PersonN=
ame><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>izing the reflector sh=
ape,
analytically.<span style=3D'mso-spacerun:yes'>&nbsp; </span>First we shall
introduce the concept of <i>angular span</i>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Next we shall note directionality =
of the
angular span, and obtain a <i>contour </i></span><st1:PersonName><i><span
 style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></i></st1:Per=
sonName><i><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>ap</span></i><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'> of the angular span i=
n each
of the two critical directions.<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Finally we shall opti</span><st1:PersonName><span style=3D'font-size=
:12.0pt;
 mso-bidi-font-size:10.0pt'>m</span></st1:PersonName><span style=3D'font-si=
ze:
12.0pt;mso-bidi-font-size:10.0pt'>ize the pot depth so that a good co</span=
><st1:PersonName><span
 style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></st1:PersonN=
ame><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>pro</span><st1:PersonN=
ame><span
 style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></st1:PersonN=
ame><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>ise can be </span><st1=
:PersonName><span
 style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></st1:PersonN=
ame><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>ade between these two
contours </span><st1:PersonName><span style=3D'font-size:12.0pt;mso-bidi-fo=
nt-size:
 10.0pt'>m</span></st1:PersonName><span style=3D'font-size:12.0pt;mso-bidi-=
font-size:
10.0pt'>aps.<o:p></o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>Angular Span and Angul=
ar Tolerance<o:p></o:p></span></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoBodyText>Assu<st1:PersonName>m</st1:PersonName>e that the coo=
kware
is a cylindrical <i>pot</i>, with radius <i>r</i> and height <i>h</i>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Let <i>XYZ</i> be a Cartesian coor=
dinate
syste<st1:PersonName>m</st1:PersonName> whose origin coincides with the cen=
ter
of the cookware, and the <i>Z</i>-axis coincides with the axis of the cookw=
are
(fig. 1).<span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>The <i>Z</i>-=
axis
is usually within a few degrees fro<st1:PersonName>m</st1:PersonName> the
vertical direction, so that food can be distributed unifor<st1:PersonName>m=
</st1:PersonName>ly
at the botto<st1:PersonName>m</st1:PersonName> of the pot.</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>Projection of the cookware on a spherical surface ce=
ntered
at an arbitrary point A is generally not circular (fig. 2). Thus <i>angular
span</i> 2<i><span style=3D'font-family:Symbol'>b</span></i> of the cookwar=
e with
respect to point A is directional.<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Consider a circle inscribed in the projection.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Ideally, no<st1:PersonName>m</st1:=
PersonName>inal
reflection fro<st1:PersonName>m</st1:PersonName> point A strikes the center=
 of
this circle. Then the <i>angular tolerance</i> is &plusmn;<i><span
style=3D'font-family:Symbol'>b</span></i><span style=3D'font-family:Symbol'=
>, </span>where
<i><span style=3D'font-family:Symbol'>b</span></i> is also directional.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The <st1:PersonName>m</st1:PersonN=
ame>ini<st1:PersonName>m</st1:PersonName>u<st1:PersonName>m</st1:PersonName>
of 2<i><span style=3D'font-family:Symbol'>b</span></i> is either <sub><!--[=
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</xml><![endif]-->, where T<i><sub>i</sub></i> are tangent points on the
inscribed circle. T<sub>1</sub>T<sub>2</sub> and T<sub>3</sub>T<sub>4</sub>
define two critical directions of the angular tolerance.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>In the first direction, reflection=
 fro<st1:PersonName>m</st1:PersonName>
point A spread across the <i>Z</i>-axis.<span style=3D'mso-spacerun:yes'>&n=
bsp;
</span>In the second direction, reflection fro<st1:PersonName>m</st1:Person=
Name>
A spread along the <i>Z</i>-axis.</p>

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<p class=3DMsoBodyText>In either critical direction the angular tolerance
&plusmn;<i><span style=3D'font-family:Symbol'>b</span></i> consists of thre=
e co<st1:PersonName>m</st1:PersonName>ponents:
structural <st1:PersonName>m</st1:PersonName>isalign<st1:PersonName>m</st1:=
PersonName>ent
(&plusmn;<i style=3D'mso-bidi-font-style:normal'><span style=3D'font-family=
:Symbol'>b</span></i><sub>1</sub>),
surface waviness (&plusmn;<i style=3D'mso-bidi-font-style:normal'><span
style=3D'font-family:Symbol'>b</span></i><sub>2</sub>), and <st1:PersonName=
>m</st1:PersonName>ove<st1:PersonName>m</st1:PersonName>ent
of the sun (&plusmn;<i style=3D'mso-bidi-font-style:normal'><span
style=3D'font-family:Symbol'>b</span></i><sub>3</sub>).<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The first two co<st1:PersonName>m<=
/st1:PersonName>ponents
double due to reflection; the third does not.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Assu<st1:PersonName>m</st1:PersonN=
ame>e
that all three co<st1:PersonName>m</st1:PersonName>ponents of <i><span
style=3D'font-family:Symbol'>b</span></i> are in the sa<st1:PersonName>m</s=
t1:PersonName>e
direction, then </p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

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</v:shape><![endif]--><![if !vml]><img width=3D128 height=3D24
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</xml><![endif]-->.<span style=3D'mso-tab-count:5'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>(1)<o:p></o:p></=
span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>Every 1&deg; error in surface orientation, either du=
e to
approxi<st1:PersonName>m</st1:PersonName>ation in the design, tolerance in =
the
construction, structural defor<st1:PersonName>m</st1:PersonName>ation, or
surface waviness, causes 2&deg; reduction in the tolerance to solar <st1:Pe=
rsonName>m</st1:PersonName>ove<st1:PersonName>m</st1:PersonName>ent,
which is equivalent to a 8-<st1:PersonName>m</st1:PersonName>inute loss in
unattended cooking. </p>

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     <v:line id=3D"_x0000_s2272" style=3D'position:absolute' from=3D"3490,5=
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      <![if !mso]>
      <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
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        <div>
        <p class=3DMsoHeading7>Y</p>
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     <v:line id=3D"_x0000_s2277" style=3D'position:absolute;flip:y' from=3D=
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     </v:line><v:line id=3D"_x0000_s2279" style=3D'position:absolute;flip:y'
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     <v:line id=3D"_x0000_s2280" style=3D'position:absolute;flip:x' from=3D=
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     <v:line id=3D"_x0000_s2268" style=3D'position:absolute;flip:y' from=3D=
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        <p class=3DMsoHeading7>Z</p>
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        <![if !mso]></td>
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l]><span
style=3D'mso-ignore:vglayout'>

<table cellpadding=3D0 cellspacing=3D0 align=3Dleft>
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</span><![endif]><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'>Fig. 1<span style=3D'mso-spacerun:yes'>&nbsp; </=
span>A
cylindrical cookware and an infinitesi</span><st1:PersonName><span
 style=3D'font-size:10.0pt'>m</span></st1:PersonName><span style=3D'font-si=
ze:10.0pt'>ally
s</span><st1:PersonName><span style=3D'font-size:10.0pt'>m</span></st1:Pers=
onName><span
style=3D'font-size:10.0pt'>all reflecting surface at point<span
style=3D'mso-spacerun:yes'>&nbsp; </span>A<o:p></o:p></span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

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   <v:textbox style=3D'mso-next-textbox:#_x0000_s2328'>
    <![if !mso]>
    <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
     <tr>
      <td><![endif]>
      <div>
      <p class=3DMsoNormal>(c)</p>
      </div>
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     </tr>
    </table>
    <![endif]></v:textbox>
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   <v:textbox style=3D'mso-next-textbox:#_x0000_s2337'>
    <![if !mso]>
    <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
     <tr>
      <td><![endif]>
      <div>
      <p class=3DMsoNormal>(b)</p>
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    </table>
    <![endif]></v:textbox>
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    <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
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      <div>
      <p class=3DMsoNormal>(a)</p>
      </div>
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     </tr>
    </table>
    <![endif]></v:textbox>
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">
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lor=3D"fuchsia"
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121;
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         <p class=3DMsoNormal><span style=3D'color:fuchsia'>T<sub>4<o:p></o=
:p></sub></span></p>
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         <![if !mso]></td>
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       </table>
       <![endif]></v:textbox>
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8600;
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hsia"/>
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8618;
     top:6111;width:542;height:416' coordorigin=3D"8618,6111" coordsize=3D"=
542,416">
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bsolute;
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      <v:textbox style=3D'mso-next-textbox:#_x0000_s2421'>
       <![if !mso]>
       <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
        <tr>
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         <div>
         <p class=3DMsoNormal><span style=3D'color:fuchsia'>T<sub>3<o:p></o=
:p></sub></span></p>
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        </tr>
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hsia"/>
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eweight=3D"1pt"/>
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"1pt"/>
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0907;
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328;
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bsolute;
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      <v:textbox style=3D'mso-next-textbox:#_x0000_s2412'>
       <![if !mso]>
       <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
        <tr>
         <td><![endif]>
         <div>
         <p class=3DMsoNormal><span style=3D'color:fuchsia'>T<sub>1<o:p></o=
:p></sub></span></p>
         </div>
         <![if !mso]></td>
        </tr>
       </table>
       <![endif]></v:textbox>
     </v:shape><v:shape id=3D"_x0000_s2413" type=3D"#_x0000_t202" style=3D'=
position:absolute;
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      <v:textbox style=3D'mso-next-textbox:#_x0000_s2413'>
       <![if !mso]>
       <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
        <tr>
         <td><![endif]>
         <div>
         <p class=3DMsoNormal><span style=3D'color:fuchsia'>T<sub>2<o:p></o=
:p></sub></span></p>
         </div>
         <![if !mso]></td>
        </tr>
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       <![endif]></v:textbox>
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color=3D"fuchsia"/>
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        <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
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          <div>
          <p class=3DMsoNormal><span style=3D'color:fuchsia'>T<sub>1<o:p></=
o:p></sub></span></p>
          </div>
          <![if !mso]></td>
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       stroked=3D"f">
       <v:textbox style=3D'mso-next-textbox:#_x0000_s2419'>
        <![if !mso]>
        <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
         <tr>
          <td><![endif]>
          <div>
          <p class=3DMsoNormal><span style=3D'color:fuchsia'>T<sub>2<o:p></=
o:p></sub></span></p>
          </div>
          <![if !mso]></td>
         </tr>
        </table>
        <![endif]></v:textbox>
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solute;
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      <v:group id=3D"_x0000_s2429" style=3D'position:absolute;left:8319;top=
:8121;
       width:512;height:401' coordorigin=3D"8319,8121" coordsize=3D"512,401=
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         <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
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           <div>
           <p class=3DMsoNormal><span style=3D'color:fuchsia'>T<sub>4<o:p><=
/o:p></sub></span></p>
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           <![if !mso]></td>
          </tr>
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       </v:shape><v:oval id=3D"_x0000_s2431" style=3D'position:absolute;lef=
t:8600;
        top:8147;width:87;height:93' fillcolor=3D"fuchsia" strokecolor=3D"f=
uchsia"/>
      </v:group><v:group id=3D"_x0000_s2432" style=3D'position:absolute;lef=
t:8618;
       top:6111;width:542;height:416' coordorigin=3D"8618,6111" coordsize=
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        <v:textbox style=3D'mso-next-textbox:#_x0000_s2433'>
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         <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
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           <div>
           <p class=3DMsoNormal><span style=3D'color:fuchsia'>T<sub>3<o:p><=
/o:p></sub></span></p>
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ignore:
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  <td></td>
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04 _x0000_s3105 _x0000_s3107 _x0000_s2348 _x0000_s3230 _x0000_s2340 _x0000_=
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</span><![endif]><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'>Fig. 2<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Projection of the cookware on a spherical surface centered at point
A.<span style=3D'mso-spacerun:yes'>&nbsp; </span><o:p></o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'>The botto</span><st1:PersonName><span
 style=3D'font-size:10.0pt'>m</span></st1:PersonName><span style=3D'font-si=
ze:10.0pt'>
surface appears larger than the top because it is closer to point A.<o:p></=
o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'>Arrows indicate critical directions at which the
angular tolerance is </span><st1:PersonName><span style=3D'font-size:10.0pt=
'>m</span></st1:PersonName><span
style=3D'font-size:10.0pt'>ini</span><st1:PersonName><span style=3D'font-si=
ze:10.0pt'>m</span></st1:PersonName><span
style=3D'font-size:10.0pt'>u</span><st1:PersonName><span style=3D'font-size=
:10.0pt'>m</span></st1:PersonName><span
style=3D'font-size:10.0pt'>.<o:p></o:p></span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>However in reality, accuracy of the surface orientat=
ion is
not as crucial.<span style=3D'mso-spacerun:yes'>&nbsp; </span>This is becau=
se
that over the entire reflector, three co<st1:PersonName>m</st1:PersonName>p=
onents
of angular tolerances are not coplanar in general.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Their directions are quite rando<s=
t1:PersonName>m</st1:PersonName>ly
distributed.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Statistically, <=
/p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><span style=3D'font-size:12=
.0pt;
mso-bidi-font-size:10.0pt'><sub><!--[if gte vml 1]><v:shape id=3D"_x0000_i1=
028"
 type=3D"#_x0000_t75" style=3D'width:135pt;height:24pt' o:ole=3D"" fillcolo=
r=3D"window">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image00=
9.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D180 height=3D32
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image010.gif" v:shape=
s=3D"_x0000_i1028"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1028"
  DrawAspect=3D"Content" ObjectID=3D"_1106821280">
 </o:OLEObject>
</xml><![endif]-->.<span style=3D'mso-tab-count:4'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>(2)<o:p></o:p></spa=
n></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>Minor deviation in local align<st1:PersonName>m</st1=
:PersonName>ent
(<i><span style=3D'font-family:Symbol'>b</span></i><sub>1</sub> and <i><span
style=3D'font-family:Symbol'>b</span></i><sub>2</sub>) has very little effe=
ct on
the tolerance to solar <st1:PersonName>m</st1:PersonName>ove<st1:PersonName=
>m</st1:PersonName>ent
(<i><span style=3D'font-family:Symbol'>b</span></i><sub>3</sub>).<span
style=3D'mso-spacerun:yes'>&nbsp; </span>A high-precision reflector is not
required for unattended cooking, so long as the reflector is designed with
adequate angular tolerance.</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>Angular Tolerance in T=
wo
Critical Directions<o:p></o:p></span></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<h5>In each of the two critical directions (across and along the <i>Z</i>-a=
xis),
we first outline a &#8220;sweet spot&#8221; in which the desired angular
tolerance is achievable.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Then=
 we
construct a reflector in this sweet spot to achieve the desired angular
tolerance, and to <st1:PersonName>m</st1:PersonName>axi<st1:PersonName>m</s=
t1:PersonName>ize
the cooking power.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Not
surprisingly, reflectors opti<st1:PersonName>m</st1:PersonName>ized for the=
se
two different directions won&#8217;t be congruent.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>We shall <st1:PersonName>m</st1:Pe=
rsonName>ini<st1:PersonName>m</st1:PersonName>ize
their differences by opti<st1:PersonName>m</st1:PersonName>izing the pot de=
pth,
so that a good co<st1:PersonName>m</st1:PersonName>pro<st1:PersonName>m</st=
1:PersonName>ise
can be achieved.</h5>

<p class=3DMsoFootnoteText><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><u><span style=3D'font-size:12.0pt;mso-bidi-font-size:=
10.0pt;
mso-bidi-font-weight:bold'>Angular Tolerance Across the Z-Axis<o:p></o:p></=
span></u></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoBodyText>In this case reflection fro<st1:PersonName>m</st1:Pe=
rsonName>
point A spreads over T<sub>1</sub>T<sub>2</sub> in figs. 2a and 2b.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Angular span of the cookware<sub><=
!--[if gte vml 1]><v:shape
 id=3D"_x0000_i1029" type=3D"#_x0000_t75" style=3D'width:66pt;height:17.25p=
t' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image01=
1.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D88 height=3D23
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image012.gif" v:shape=
s=3D"_x0000_i1029"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1029"
  DrawAspect=3D"Content" ObjectID=3D"_1106821281">
 </o:OLEObject>
</xml><![endif]--> is difficult to evaluate.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>For si<st1:PersonName>m</st1:Perso=
nName>plicity
we approxi<st1:PersonName>m</st1:PersonName>ate the angular span by <sub><!=
--[if gte vml 1]><v:shape
 id=3D"_x0000_i1030" type=3D"#_x0000_t75" style=3D'width:44.25pt;height:17.=
25pt'
 o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image01=
3.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D59 height=3D23
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image014.gif" v:shape=
s=3D"_x0000_i1030"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1030"
  DrawAspect=3D"Content" ObjectID=3D"_1106821282">
 </o:OLEObject>
</xml><![endif]-->, where D<sub>1</sub>D<sub>2</sub>=3D 2<i>r </i>is a dia<=
st1:PersonName>m</st1:PersonName>eter
of the cookware.<span style=3D'mso-spacerun:yes'>&nbsp; </span>The error in=
volved
is s<st1:PersonName>m</st1:PersonName>all, especially if A is far fro<st1:P=
ersonName>m</st1:PersonName>
the cookware.<span style=3D'mso-spacerun:yes'>&nbsp; </span>The locus of eq=
ual
angular span, abbreviated as <i>the locus of equal-span</i>, is given by:</=
p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><b style=3D'mso-bidi-font-w=
eight:
normal'><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><sub><!-=
-[if gte vml 1]><v:shape
 id=3D"_x0000_i1031" type=3D"#_x0000_t75" style=3D'width:128.25pt;height:18=
pt' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image01=
5.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D171 height=3D24
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image016.gif" v:shape=
s=3D"_x0000_i1031"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1031"
  DrawAspect=3D"Content" ObjectID=3D"_1106821283">
 </o:OLEObject>
</xml><![endif]--></span></b><span style=3D'font-size:12.0pt;mso-bidi-font-=
size:
10.0pt;mso-bidi-font-weight:bold'>.</span><b style=3D'mso-bidi-font-weight:=
normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><span style=3D'mso-tab=
-count:
4'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; </span></span></b><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bo=
ld'>(3)<o:p></o:p></span></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><span style=3D'font-size:12=
.0pt;
mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></spa=
n></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'>A slightly=
 better
approxi</span><st1:PersonName><span style=3D'mso-bidi-font-weight:bold'>m</=
span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>ation exists near the <i>XY</i>-plane: =
<o:p></o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoNormal style=3D'margin-left:.5in'><b style=3D'mso-bidi-font-w=
eight:
normal'><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><sub><!-=
-[if gte vml 1]><v:shape
 id=3D"_x0000_i1032" type=3D"#_x0000_t75" style=3D'width:128.25pt;height:18=
pt' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image01=
7.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D171 height=3D24
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image018.gif" v:shape=
s=3D"_x0000_i1032"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1032"
  DrawAspect=3D"Content" ObjectID=3D"_1106821284">
 </o:OLEObject>
</xml><![endif]--></span></b><span style=3D'font-size:12.0pt;mso-bidi-font-=
size:
10.0pt;mso-bidi-font-weight:bold'>.</span><b style=3D'mso-bidi-font-weight:=
normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><span style=3D'mso-tab=
-count:
4'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp; </span></span></b><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bo=
ld'>(4)<o:p></o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt;
mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText>Equations (3) and (4) together describe a locus of
equal-span, which is roughly a sphere concentric with the cookware (fig.
4a).<span style=3D'mso-spacerun:yes'>&nbsp; </span>A fa<st1:PersonName>m</s=
t1:PersonName>ily
of such loci constitutes a <i>contour </i><st1:PersonName><i>m</i></st1:Per=
sonName><i>ap</i>
of angular span.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Provided tha=
t the
reflecting surface can be designed properly that no<st1:PersonName>m</st1:P=
ersonName>inal
reflection bisects the angular span, this fa<st1:PersonName>m</st1:PersonNa=
me>ily
of loci is also a contour <st1:PersonName>m</st1:PersonName>ap of the angul=
ar
tolerance.<span style=3D'mso-spacerun:yes'>&nbsp; </span>The angular tolera=
nce
increases toward the cookware (fig. 4b).<span style=3D'mso-spacerun:yes'>&n=
bsp;
</span>The &#8220;sweet spot&#8221; is outlined by a contour (<i>i.e.</i>,
locus) associated with the desired angular tolerance.<span
style=3D'mso-spacerun:yes'>&nbsp; </span><span style=3D'mso-bidi-font-weigh=
t:bold'>For
</span><st1:PersonName><span style=3D'mso-bidi-font-weight:bold'>m</span></=
st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>axi</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>u</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'> cooking power, the <i>ri</i></span><st=
1:PersonName><i><span
 style=3D'mso-bidi-font-weight:bold'>m</span></i></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'> (edge, or opening) of an opti</span><s=
t1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>al reflector consists of tangent points=
 of
the contour with respect to the incident sunlight (fig. 4a).<span
style=3D'mso-spacerun:yes'>&nbsp; </span>It is a great circle of the sphere=
.<o:p></o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt;
mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><!--[if gte vml 1]><v:group id=3D"_x0000_s2409" style=
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    <v:textbox style=3D'mso-next-textbox:#_x0000_s2386'>
     <![if !mso]>
     <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
      <tr>
       <td><![endif]>
       <div>
       <p class=3DMsoNormal>A</p>
       </div>
       <![if !mso]></td>
      </tr>
     </table>
     <![endif]></v:textbox>
   </v:shape><v:group id=3D"_x0000_s2390" style=3D'position:absolute;left:3=
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"4975,3866">
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27">
     <v:line id=3D"_x0000_s2365" style=3D'position:absolute;flip:x' from=3D=
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     </v:line><v:line id=3D"_x0000_s2366" style=3D'position:absolute;flip:x'
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</span><![endif]><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;
mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span
style=3D'mso-bidi-font-weight:bold'>Fig. 3<span style=3D'mso-spacerun:yes'>=
&nbsp;
</span>Top: Side view of a cookware and a reflecting point A; and <o:p></o:=
p></span></p>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span
style=3D'mso-bidi-font-weight:bold'>Botto</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>: A cross-section in a plane containing=
 the
tangent points.<o:p></o:p></span></p>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span
style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'><span
style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><!--[if gte vml 1]><v:group id=3D"_x0000_s3191" styl=
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       coordsize=3D"1333,1870">
       <v:shape id=3D"_x0000_s3177" style=3D'position:absolute;left:5578;to=
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        width:1020;height:1870;mso-wrap-style:square;mso-wrap-distance-left=
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        mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
        mso-wrap-distance-bottom:0;v-text-anchor:top' coordsize=3D"1020,187=
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        path=3D"m,l500,1870,1020,e" filled=3D"f" strokecolor=3D"fuchsia"
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        <v:path arrowok=3D"t"/>
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f">
        <v:textbox style=3D'mso-next-textbox:#_x0000_s3178'>
         <![if !mso]>
         <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
          <tr>
           <td><![endif]>
           <div>
           <p class=3DMsoNormal><span style=3D'color:fuchsia'>2</span><i><s=
pan
           style=3D'font-family:Symbol;color:fuchsia'>b<o:p></o:p></span></=
i></p>
           </div>
           <![if !mso]></td>
          </tr>
         </table>
         <![endif]></v:textbox>
       </v:shape></v:group></v:group><v:group id=3D"_x0000_s3192" style=3D'=
position:absolute;
      left:4103;top:8093;width:2042;height:2542' coordorigin=3D"4138,8176"
      coordsize=3D"2042,2542">
      <v:shape id=3D"_x0000_s3193" type=3D"#_x0000_t202" style=3D'position:=
absolute;
       left:5767;top:10291;width:413;height:427' filled=3D"f" stroked=3D"f">
       <v:textbox style=3D'mso-next-textbox:#_x0000_s3193'>
        <![if !mso]>
        <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
         <tr>
          <td><![endif]>
          <div>
          <p class=3DMsoNormal><i>Y<o:p></o:p></i></p>
          </div>
          <![if !mso]></td>
         </tr>
        </table>
        <![endif]></v:textbox>
      </v:shape><v:shape id=3D"_x0000_s3194" type=3D"#_x0000_t202" style=3D=
'position:absolute;
       left:4138;top:8176;width:707;height:614' filled=3D"f" stroked=3D"f">
       <v:textbox style=3D'mso-next-textbox:#_x0000_s3194'>
        <![if !mso]>
        <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
         <tr>
          <td><![endif]>
          <div>
          <p class=3DMsoNormal><i>Z<o:p></o:p></i></p>
          </div>
          <![if !mso]></td>
         </tr>
        </table>
        <![endif]></v:textbox>
      </v:shape></v:group></v:group><v:group id=3D"_x0000_s3201" style=3D'p=
osition:absolute;
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     coordsize=3D"1970,1050">
     <v:shape id=3D"_x0000_s3199" type=3D"#_x0000_t202" style=3D'position:a=
bsolute;
      left:3735;top:9855;width:924;height:615' filled=3D"f" stroked=3D"f">
      <v:textbox style=3D'mso-next-textbox:#_x0000_s3199'>
       <![if !mso]>
       <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
        <tr>
         <td><![endif]>
         <div>
         <p class=3DMsoNormal><i>r<span
         style=3D'mso-spacerun:yes'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>r=
<o:p></o:p></i></p>
         </div>
         <![if !mso]></td>
        </tr>
       </table>
       <![endif]></v:textbox>
     </v:shape><v:shape id=3D"_x0000_s3200" type=3D"#_x0000_t202" style=3D'=
position:absolute;
      left:3247;top:9420;width:1970;height:555' filled=3D"f" stroked=3D"f">
      <v:textbox style=3D'mso-next-textbox:#_x0000_s3200'>
       <![if !mso]>
       <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
        <tr>
         <td><![endif]>
         <div>
         <p class=3DMsoFootnoteText>Cooking Pot</p>
         </div>
         <![if !mso]></td>
        </tr>
       </table>
       <![endif]></v:textbox>
     </v:shape></v:group></v:group><v:shape id=3D"_x0000_s3203" type=3D"#_x=
0000_t202"
    style=3D'position:absolute;left:1995;top:8251;width:2965;height:408'
    filled=3D"f" stroked=3D"f">
    <v:textbox style=3D'mso-next-textbox:#_x0000_s3203'>
     <![if !mso]>
     <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
      <tr>
       <td><![endif]>
       <div>
       <p class=3DMsoNormal>Locus of equal-span</p>
       </div>
       <![if !mso]></td>
      </tr>
     </table>
     <![endif]></v:textbox>
   </v:shape></v:group><v:group id=3D"_x0000_s3210" style=3D'position:absol=
ute;
   left:6398;top:8251;width:3557;height:3556' coordorigin=3D"6398,8251"
   coordsize=3D"3557,3556">
   <v:group id=3D"_x0000_s3198" style=3D'position:absolute;left:6398;top:85=
01;
    width:3364;height:3306' coordorigin=3D"6398,8501" coordsize=3D"3364,330=
6">
    <v:group id=3D"_x0000_s3182" style=3D'position:absolute;left:6398;top:8=
501;
     width:3364;height:3306' coordorigin=3D"4168,8336" coordsize=3D"3780,37=
10"
     o:regroupid=3D"347">
     <v:rect id=3D"_x0000_s3183" style=3D'position:absolute;left:5578;top:9=
856;
      width:1020;height:590' filled=3D"f" strokeweight=3D"1.5pt"/>
     <v:oval id=3D"_x0000_s3184" style=3D'position:absolute;left:4168;top:8=
336;
      width:3780;height:3710' filled=3D"f"/>
    </v:group><v:oval id=3D"_x0000_s3196" style=3D'position:absolute;left:7=
402;
     top:9405;width:1403;height:1395' filled=3D"f"/>
    <v:oval id=3D"_x0000_s3197" style=3D'position:absolute;left:6930;top:89=
85;
     width:2355;height:2370' filled=3D"f"/>
   </v:group><v:group id=3D"_x0000_s3209" style=3D'position:absolute;left:8=
098;
    top:8251;width:1857;height:1409' coordorigin=3D"8098,8251" coordsize=3D=
"1857,1409">
    <v:shape id=3D"_x0000_s3206" type=3D"#_x0000_t202" style=3D'position:ab=
solute;
     left:8561;top:8251;width:1394;height:456' filled=3D"f" stroked=3D"f">
     <v:textbox style=3D'mso-next-textbox:#_x0000_s3206'>
      <![if !mso]>
      <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
       <tr>
        <td><![endif]>
        <div>
        <p class=3DMsoNormal><i><span style=3D'font-family:Symbol'>b</span>=
</i><span
        style=3D'font-family:Symbol'>=3D15&deg;<o:p></o:p></span></p>
        </div>
        <![if !mso]></td>
       </tr>
      </table>
      <![endif]></v:textbox>
    </v:shape><v:shape id=3D"_x0000_s3207" type=3D"#_x0000_t202" style=3D'p=
osition:absolute;
     left:8333;top:8707;width:1394;height:456' filled=3D"f" stroked=3D"f">
     <v:textbox style=3D'mso-next-textbox:#_x0000_s3207'>
      <![if !mso]>
      <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
       <tr>
        <td><![endif]>
        <div>
        <p class=3DMsoNormal><i><span style=3D'font-family:Symbol'>b</span>=
</i><span
        style=3D'font-family:Symbol'>=3D20&deg;<o:p></o:p></span></p>
        </div>
        <![if !mso]></td>
       </tr>
      </table>
      <![endif]></v:textbox>
    </v:shape><v:shape id=3D"_x0000_s3208" type=3D"#_x0000_t202" style=3D'p=
osition:absolute;
     left:8098;top:9088;width:1394;height:572' filled=3D"f" stroked=3D"f">
     <v:textbox style=3D'mso-next-textbox:#_x0000_s3208'>
      <![if !mso]>
      <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
       <tr>
        <td><![endif]>
        <div>
        <p class=3DMsoNormal><i><span style=3D'font-family:Symbol'>b</span>=
</i><span
        style=3D'font-family:Symbol'>=3D35&deg;<o:p></o:p></span></p>
        </div>
        <![if !mso]></td>
       </tr>
      </table>
      <![endif]></v:textbox>
    </v:shape></v:group></v:group><v:shape id=3D"_x0000_s3211" type=3D"#_x0=
000_t202"
   style=3D'position:absolute;left:3735;top:12150;width:775;height:540' fil=
led=3D"f"
   stroked=3D"f">
   <v:textbox style=3D'mso-next-textbox:#_x0000_s3211'>
    <![if !mso]>
    <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
     <tr>
      <td><![endif]>
      <div>
      <p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'>(a)</=
p>
      </div>
      <![if !mso]></td>
     </tr>
    </table>
    <![endif]></v:textbox>
  </v:shape><v:shape id=3D"_x0000_s3212" type=3D"#_x0000_t202" style=3D'pos=
ition:absolute;
   left:7653;top:12150;width:775;height:540' filled=3D"f" stroked=3D"f">
   <v:textbox style=3D'mso-next-textbox:#_x0000_s3212'>
    <![if !mso]>
    <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
     <tr>
      <td><![endif]>
      <div>
      <p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'>(b)</=
p>
      </div>
      <![if !mso]></td>
     </tr>
    </table>
    <![endif]></v:textbox>
  </v:shape></v:group><v:group id=3D"_x0000_s3224" style=3D'position:absolu=
te;
  left:2403;top:10025;width:3742;height:3355' coordorigin=3D"2403,10025"
  coordsize=3D"3742,3355">
  <v:group id=3D"_x0000_s3217" style=3D'position:absolute;left:2403;top:120=
72;
   width:3611;height:1308' coordorigin=3D"2403,12072" coordsize=3D"3611,111=
3"
   o:regroupid=3D"348">
   <v:shape id=3D"_x0000_s3215" style=3D'position:absolute;left:2403;top:12=
072;
    width:3352;height:798;mso-wrap-style:square;mso-wrap-distance-left:9pt;
    mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
    mso-wrap-distance-bottom:0;v-text-anchor:top' coordsize=3D"3352,798" pa=
th=3D"m,c570,399,1141,798,1700,798,2259,798,2805,399,3352,e"
    filled=3D"f" strokecolor=3D"blue" strokeweight=3D"1.5pt">
    <v:stroke dashstyle=3D"dash"/>
    <v:path arrowok=3D"t"/>
   </v:shape><v:shape id=3D"_x0000_s3216" type=3D"#_x0000_t202" style=3D'po=
sition:absolute;
    left:4405;top:12732;width:1609;height:453' filled=3D"f" stroked=3D"f">
    <v:textbox style=3D'mso-next-textbox:#_x0000_s3216'>
     <![if !mso]>
     <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
      <tr>
       <td><![endif]>
       <div>
       <p class=3DMsoNormal><span style=3D'color:blue'>Reflector<o:p></o:p>=
</span></p>
       </div>
       <![if !mso]></td>
      </tr>
     </table>
     <![endif]></v:textbox>
   </v:shape></v:group><v:group id=3D"_x0000_s3223" style=3D'position:absol=
ute;
   left:4818;top:10025;width:1327;height:2052' coordorigin=3D"4818,10025"
   coordsize=3D"1327,2052">
   <v:line id=3D"_x0000_s3218" style=3D'position:absolute' from=3D"5755,100=
25" to=3D"5755,12077"
    o:regroupid=3D"349" strokecolor=3D"red">
    <v:stroke endarrow=3D"block"/>
   </v:line><v:shape id=3D"_x0000_s3219" type=3D"#_x0000_t202" style=3D'pos=
ition:absolute;
    left:4818;top:10025;width:1327;height:408' o:regroupid=3D"349" filled=
=3D"f"
    stroked=3D"f">
    <v:textbox style=3D'mso-next-textbox:#_x0000_s3219'>
     <![if !mso]>
     <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
      <tr>
       <td><![endif]>
       <div>
       <p class=3DMsoNormal><span style=3D'color:red'>Sunlight<o:p></o:p></=
span></p>
       </div>
       <![if !mso]></td>
      </tr>
     </table>
     <![endif]></v:textbox>
   </v:shape></v:group></v:group></v:group><![endif]--><![if !vml]><span
style=3D'mso-ignore:vglayout'>

<table cellpadding=3D0 cellspacing=3D0 align=3Dleft>
 <tr>
  <td width=3D13 height=3D10></td>
 </tr>
 <tr>
  <td></td>
  <td><img width=3D547 height=3D311
  src=3D"Therobustnessofreflectivesolarcookerrev2_files/image020.gif" v:sha=
pes=3D"_x0000_s3191 _x0000_s3173 _x0000_s3174 _x0000_s3185 _x0000_s3186 _x0=
000_s3187 _x0000_s3225 _x0000_s3214 _x0000_s3204 _x0000_s3202 _x0000_s3195 =
_x0000_s3180 _x0000_s3176 _x0000_s3149 _x0000_s3157 _x0000_s3175 _x0000_s31=
71 _x0000_s3172 _x0000_s3179 _x0000_s3177 _x0000_s3178 _x0000_s3192 _x0000_=
s3193 _x0000_s3194 _x0000_s3201 _x0000_s3199 _x0000_s3200 _x0000_s3203 _x00=
00_s3210 _x0000_s3198 _x0000_s3182 _x0000_s3183 _x0000_s3184 _x0000_s3196 _=
x0000_s3197 _x0000_s3209 _x0000_s3206 _x0000_s3207 _x0000_s3208 _x0000_s321=
1 _x0000_s3212 _x0000_s3224 _x0000_s3217 _x0000_s3215 _x0000_s3216 _x0000_s=
3223 _x0000_s3218 _x0000_s3219"></td>
 </tr>
</table>

</span><![endif]><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p=
></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'>Fig. 4<span
style=3D'mso-spacerun:yes'>&nbsp; </span>For angular tolerance </span><b
style=3D'mso-bidi-font-weight:normal'><span style=3D'font-size:10.0pt'>acro=
ss</span></b><span
style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'> the Z-axis, a) A locu=
s of
equal-span (and equal-tolerance); and<o:p></o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'>b) A contour </span><s=
t1:PersonName><span
 style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'>m</span></st1:PersonN=
ame><span
style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'>ap of the angular span=
 (or
angular tolerance) <o:p></o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'>To cook wi=
thout
adjust</span><st1:PersonName><span style=3D'mso-bidi-font-weight:bold'>m</s=
pan></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>ent for two hours, let </span><i><span
style=3D'font-family:Symbol;mso-bidi-font-weight:bold'>b</span></i><span
style=3D'mso-bidi-font-weight:bold'>=3D15&deg;. Then radius <i>R<sub>o</sub=
></i> of
the great circle is either <i>r</i>cot15&deg; or <i>r</i>csc15&deg;, depend=
ing
on whether the ri</span><st1:PersonName><span style=3D'mso-bidi-font-weight=
:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'> is close to the <i>XY</i>-plane.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The gain of the cooker, defined as=
 <o:p></o:p></span></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><sub><!--[if gte vml 1]><=
v:shape
 id=3D"_x0000_i1033" type=3D"#_x0000_t75" style=3D'width:60.75pt;height:20.=
25pt'
 o:ole=3D"" fillcolor=3D"window">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image02=
1.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D81 height=3D27
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image022.gif" v:shape=
s=3D"_x0000_i1033"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1033"
  DrawAspect=3D"Content" ObjectID=3D"_1106821286">
 </o:OLEObject>
</xml><![endif]-->,<span style=3D'mso-tab-count:6'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>(5)<span
style=3D'mso-bidi-font-weight:bold'><o:p></o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt;
mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'>is between=
 14 and
15.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Assu</span><st1:PersonNam=
e><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>e that the solar cooker is 60% efficien=
t, and
that the sunlight intensity is 300 W/</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>&sup2;.<span style=3D'mso-spacerun:yes'=
>&nbsp;
</span>Then approxi</span><st1:PersonName><span style=3D'mso-bidi-font-weig=
ht:
 bold'>m</span></st1:PersonName><span style=3D'mso-bidi-font-weight:bold'>a=
tely
50 </span><st1:PersonName><span style=3D'mso-bidi-font-weight:bold'>m</span=
></st1:PersonName><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'> (2 inch) deep of dense food (soup, ric=
e,
etc.) can be cooked unattended, irrespective of the radius of the pot. <o:p=
></o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'><o:p>&nbsp=
;</o:p></span></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><u><span style=3D'font-size:12.0pt;mso-bidi-font-size:=
10.0pt;
mso-bidi-font-weight:bold'>Angular Tolerance along the Z-Axis<o:p></o:p></s=
pan></u></p>

<p class=3DMsoBodyText style=3D'margin-top:12.0pt'>Analysis in this directi=
on is <st1:PersonName>m</st1:PersonName>ore
co<st1:PersonName>m</st1:PersonName>plicated than the previous one.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>For pedagogic purpose we shall fir=
st
consider the si<st1:PersonName>m</st1:PersonName>plest case of cooking with=
 a
flat <i>pan</i> (or a shiny pot with one dark end).<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Then consider a dark pot with an
arbitrary depth.<span style=3D'mso-spacerun:yes'>&nbsp; </span></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<h6><i><span style=3D'text-decoration:none;text-underline:none'>Cooking wit=
h a
Flat Pan<o:p></o:p></span></i></h6>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>By ele<st1:PersonName>m</st1:PersonName>entary geo<s=
t1:PersonName>m</st1:PersonName>etry,
the locus of equal-span is a pair of intersecting circles in which the pan =
is
the co<st1:PersonName>m</st1:PersonName><st1:PersonName>m</st1:PersonName>on
cord (fig. 5a). A fa<st1:PersonName>m</st1:PersonName>ily of such loci
constitutes a <i>contour </i><st1:PersonName><i>m</i></st1:PersonName><i>ap=
</i>
of angular span, which is also regarded as a contour <st1:PersonName>m</st1=
:PersonName>ap
of the angular tolerance (fig. 5b).<span style=3D'mso-spacerun:yes'>&nbsp;
</span>The &#8220;sweet spot&#8221; is outlined by a contour associated wit=
h the
desired angular tolerance.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Fo=
r <st1:PersonName>m</st1:PersonName>axi<st1:PersonName>m</st1:PersonName>u<=
st1:PersonName>m</st1:PersonName>
power, the opti<st1:PersonName>m</st1:PersonName>al ri<st1:PersonName>m</st=
1:PersonName>
again <span style=3D'mso-bidi-font-weight:bold'>consists of tangent points =
of the
contour with respect to the incident sunlight. </span><span
style=3D'mso-spacerun:yes'>&nbsp;</span><span style=3D'mso-bidi-font-weight=
:bold'>Two
distinct solutions exist</span>.<span style=3D'mso-spacerun:yes'>&nbsp; </s=
pan>If
the sunlight is parallel to the Z-axis, each opti<st1:PersonName>m</st1:Per=
sonName>al
ri<st1:PersonName>m</st1:PersonName> is axisy<st1:PersonName>m</st1:PersonN=
ame><st1:PersonName>m</st1:PersonName>etric
(fig. 6).<span style=3D'mso-spacerun:yes'>&nbsp; </span><i><o:p></o:p></i><=
/p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt;
mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'>At any giv=
en
point, angular tolerance is </span><st1:PersonName><span style=3D'mso-bidi-=
font-weight:
 bold'>m</span></st1:PersonName><span style=3D'mso-bidi-font-weight:bold'>a=
xi</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>ized when the no</span><st1:PersonName>=
<span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>inal reflection bisects the correspondi=
ng
angular span.<span style=3D'mso-spacerun:yes'>&nbsp; </span>By ele</span><s=
t1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>entary geo</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>etry, no</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>inal reflection should be directed at a=
 <i><span
style=3D'color:black'>Z</span></i><span style=3D'color:black'>-intercept (F=
 or F<sup>*</sup>)
of the contour containing the reflecting point (fig. 6).</span></span></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><o:p>&nbsp;</o:p></p>

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         style=3D'color:blue'><o:p></o:p></span></p>
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         style=3D'font-family:Symbol;color:blue'>b</span><span style=3D'col=
or:blue'>=3D18&deg;</span></i></p>
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         <p class=3DMsoNormal><i style=3D'mso-bidi-font-style:normal'><span
         style=3D'font-family:Symbol;color:blue'>b</span><span style=3D'col=
or:blue'>=3D45&deg;</span></i></p>
         <p class=3DMsoNormal><o:p>&nbsp;</o:p></p>
         </div>
         <![if !mso]></td>
        </tr>
       </table>
       <![endif]></v:textbox>
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<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

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<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></spa=
n></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'>Fig. 5<span
style=3D'mso-spacerun:yes'>&nbsp; </span>For angular tolerance </span><b
style=3D'mso-bidi-font-weight:normal'><span style=3D'font-size:10.0pt'>alon=
g</span></b><span
style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'> the Z-axis, a) A locu=
s of
equal-span (and equal-tolerance), </span><span style=3D'font-size:10.0pt'>w=
here </span><i><span
style=3D'font-size:10.0pt;font-family:Symbol'>j</span></i><span style=3D'fo=
nt-size:
10.0pt'>=3D4</span><i><span style=3D'font-size:10.0pt;font-family:Symbol'>b=
</span></i><span
style=3D'font-size:10.0pt'> is the </span><st1:PersonName><span style=3D'fo=
nt-size:
 10.0pt'>m</span></st1:PersonName><span style=3D'font-size:10.0pt'>easure o=
f the
cord; <span style=3D'mso-bidi-font-weight:bold'><span
style=3D'mso-spacerun:yes'>&nbsp;</span>and b) A contour </span></span><st1=
:PersonName><span
 style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'>m</span></st1:PersonN=
ame><span
style=3D'font-size:10.0pt;mso-bidi-font-weight:bold'>ap of the angular span=
 (or
angular tolerance) <o:p></o:p></span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

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<table cellpadding=3D0 cellspacing=3D0 align=3Dleft>
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<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

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<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><o:p>&nbs=
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p;</o:p></p>

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</span></p>

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</span></p>

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</span></p>

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</span></p>

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</span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'>Fig. 6<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Reflectors opti</span><st1:PersonName><span style=3D'font-size:10.0p=
t'>m</span></st1:PersonName><span
style=3D'font-size:10.0pt'>ized for a flat pan and for sunlight parallel to=
 the <i>Z</i>-axis<o:p></o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt;
color:black;mso-bidi-font-weight:bold'>According to figs. 5b and 6, angular
span is not unifor</span><st1:PersonName><span style=3D'font-size:12.0pt;
 mso-bidi-font-size:10.0pt;color:black;mso-bidi-font-weight:bold'>m</span><=
/st1:PersonName><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;color:black;mso-bidi-fo=
nt-weight:
bold'> over the reflector.<span style=3D'mso-spacerun:yes'>&nbsp; </span>On
contours associated with greater angular span, Z-intercepts F and F<sup>*</=
sup>
are farther away fro</span><st1:PersonName><span style=3D'font-size:12.0pt;
 mso-bidi-font-size:10.0pt;color:black;mso-bidi-font-weight:bold'>m</span><=
/st1:PersonName><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;color:black;mso-bidi-fo=
nt-weight:
bold'> the pan.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Thus a reflec=
tor
opti</span><st1:PersonName><span style=3D'font-size:12.0pt;mso-bidi-font-si=
ze:
 10.0pt;color:black;mso-bidi-font-weight:bold'>m</span></st1:PersonName><sp=
an
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;color:black;mso-bidi-fo=
nt-weight:
bold'>ized</span><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;
mso-bidi-font-weight:bold'> for angular tolerance at every point does not h=
ave
a well-defined focal point.<span style=3D'mso-spacerun:yes'>&nbsp; </span>I=
t is
definitely not a parabola.<o:p></o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt;
mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt;
mso-bidi-font-weight:bold'>However in practice, angular tolerance needn&#82=
17;t
be opti</span><st1:PersonName><span style=3D'font-size:12.0pt;mso-bidi-font=
-size:
 10.0pt;mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bo=
ld'>ized
over the entire reflector.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Po=
ints
closer to the cookware can tolerate </span><st1:PersonName><span
 style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:b=
old'>m</span></st1:PersonName><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bo=
ld'>ore
syste</span><st1:PersonName><span style=3D'font-size:12.0pt;mso-bidi-font-s=
ize:
 10.0pt;mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bo=
ld'>atic
</span><st1:PersonName><span style=3D'font-size:12.0pt;mso-bidi-font-size:1=
0.0pt;
 mso-bidi-font-weight:bold'>m</span></st1:PersonName><span style=3D'font-si=
ze:
12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bold'>isalign</span><=
st1:PersonName><span
 style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:b=
old'>m</span></st1:PersonName><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bo=
ld'>ent.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Thus a fixed focal point is
acceptable.<span style=3D'mso-spacerun:yes'>&nbsp; </span>For si</span><st1=
:PersonName><span
 style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:b=
old'>m</span></st1:PersonName><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bo=
ld'>plicity
the reflector is al</span><st1:PersonName><span style=3D'font-size:12.0pt;
 mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bold'>m</span></st1:PersonN=
ame><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;mso-bidi-font-weight:bo=
ld'>ost
always a parabola.<o:p></o:p></span></p>

<p class=3DMsoNormal><span style=3D'font-size:12.0pt;mso-bidi-font-size:10.=
0pt;
mso-bidi-font-weight:bold'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText>When the sun is far off the <i>Z</i>-axis, the previ=
ously
designed reflectors <st1:PersonName>m</st1:PersonName>ust be turned to foll=
ow
the sun. A first solution is to pivot the reflector about its focal point F,
and point its principal optical axis directly at the sun (fig. 7a).<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The focus re<st1:PersonName>m</st1=
:PersonName>ains
sharp.<span style=3D'mso-spacerun:yes'>&nbsp; </span>However a portion of t=
he
reflector protrudes outside of the contour, hence unable to achieve the des=
ired
angular tolerance.<span style=3D'mso-spacerun:yes'>&nbsp; </span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>A second solution is to pivot the reflector about its
apex, and turn its principal axis halfway toward the sun (fig. 7b). The
reflecting surface protrudes <st1:PersonName>m</st1:PersonName>uch less tha=
n in
the first solution. <span style=3D'mso-spacerun:yes'>&nbsp;</span>However t=
he
focal point F beco<st1:PersonName>m</st1:PersonName>es blurred.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The aberration can be very large,
especially if the sun is far off the <i>Z</i>-axis.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>In order to reduce aberration, eit=
her
the reflector <st1:PersonName>m</st1:PersonName>ust be tri<st1:PersonName>m=
</st1:PersonName><st1:PersonName>m</st1:PersonName>ed
severely around its ri<st1:PersonName>m</st1:PersonName>, or the pan <st1:P=
ersonName>m</st1:PersonName>ust
re<st1:PersonName>m</st1:PersonName>ain facing the sun.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Neither option is desirable.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Thus a flat pan (or a shiny pot wi=
th a
dark botto<st1:PersonName>m</st1:PersonName>) is unsuitable for unattended
solar cooking.</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

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       <p class=3DMsoNormal>(b)</p>
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e:10.0pt;
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yout'>

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</span><![endif]><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'>Fig. 7<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Align</span><st1:PersonName><span style=3D'font-size:10.0pt'>m</span=
></st1:PersonName><span
style=3D'font-size:10.0pt'>ent sche</span><st1:PersonName><span style=3D'fo=
nt-size:
 10.0pt'>m</span></st1:PersonName><span style=3D'font-size:10.0pt'>es when =
the
sun is off the Z-axis<o:p></o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'margin-left:.25in;text-align=
:center'><span
style=3D'font-size:10.0pt'>a) Pivoting about the focal point; b) Pivoting a=
bout
the apex.<o:p></o:p></span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<h6><i><span style=3D'text-decoration:none;text-underline:none'>Cooking wit=
h a
Dark Pot<o:p></o:p></span></i></h6>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>Consider now a <st1:PersonName>m</st1:PersonName>ore
general case of cooking with a dark pot.<span style=3D'mso-spacerun:yes'>&n=
bsp;
</span>Let <i style=3D'mso-bidi-font-style:normal'><span style=3D'font-fami=
ly:Symbol'>q</span></i>
be the angle between its diagonal and its botto<st1:PersonName>m</st1:Perso=
nName>
surface (fig. 8).<span style=3D'mso-spacerun:yes'>&nbsp; </span>A reflecting
point <st1:PersonName>m</st1:PersonName>ay face the top, botto<st1:PersonNa=
me>m</st1:PersonName>,
or diagonal of the pot.<span style=3D'mso-spacerun:yes'>&nbsp; </span>In any
cross-section through the <i>Z</i>-axis, locus of equal-span consists of ei=
ght
circular arcs. Each arc is part of a circle containing the top, the botto<s=
t1:PersonName>m</st1:PersonName>,
or a diagonal of the cookware as a cord.<span style=3D'mso-spacerun:yes'>&n=
bsp;
</span>For clarity these circles are not shown in their entirety.</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><span style=3D'color:black'>Also for clarity, let th=
e <i>Z</i>-axis
be fixed vertically.<span style=3D'mso-spacerun:yes'>&nbsp; </span></span><=
span
style=3D'mso-bidi-font-weight:bold'>A cooker can only be opti</span><st1:Pe=
rsonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>ized for a specific <i>no</i></span><st=
1:PersonName><i><span
 style=3D'mso-bidi-font-weight:bold'>m</span></i></st1:PersonName><i><span
style=3D'mso-bidi-font-weight:bold'>inal</span></i><span style=3D'mso-bidi-=
font-weight:
bold'> <i>elevation</i> <i>e</i> of the sun.<span
style=3D'mso-spacerun:yes'>&nbsp; </span></span>The design is relatively si=
<st1:PersonName>m</st1:PersonName>ple
when <i>e</i>=3D90&deg;.<span style=3D'mso-spacerun:yes'>&nbsp; </span>The =
sunlight
is parallel to the <i>Z</i>-axis.<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Two pairs of opti<st1:PersonName>m</st1:PersonName>al ri<st1:PersonN=
ame>m</st1:PersonName>
locations (EE and E<sup>*</sup>E<sup>*</sup>) exist.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Both have the sa<st1:PersonName>m<=
/st1:PersonName>e
radius <i>R</i>, hence identical gain <i>G</i>:</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><sub><!--[if gte vml 1]><=
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</v:shape><![endif]--><![if !vml]><img width=3D273 height=3D25
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&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>(6)</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'>At the sa</span><st1:Per=
sonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>e
angular tolerance (&plusmn;</span><i><span style=3D'font-family:Symbol;
color:black'>b</span></i><span style=3D'color:black'>), the locus associate=
d with
a deeper pot (with larger </span><i><span style=3D'font-family:Symbol;color=
:black'>q</span></i><span
style=3D'color:black'>) is wider.<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Thus a higher gain can be achieved.<span style=3D'mso-spacerun:yes'>=
&nbsp;
</span>As a concrete exa</span><st1:PersonName><span style=3D'color:black'>=
m</span></st1:PersonName><span
style=3D'color:black'>ple, let </span><i style=3D'mso-bidi-font-style:norma=
l'><span
style=3D'font-family:Symbol;color:black'>b</span></i><span style=3D'font-fa=
mily:
Symbol;color:black;mso-bidi-font-style:italic'>=3D</span><span style=3D'col=
or:black'>15&deg;
at the ri</span><st1:PersonName><span style=3D'color:black'>m</span></st1:P=
ersonName><span
style=3D'color:black'>.<span style=3D'mso-spacerun:yes'>&nbsp; </span>By ra=
ising </span><i
style=3D'mso-bidi-font-style:normal'><span style=3D'font-family:Symbol;colo=
r:black'>q
</span></i><span style=3D'color:black'><span
style=3D'mso-spacerun:yes'>&nbsp;</span>fro</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
> 0 to
30&deg;, the gain is raised fro</span><st1:PersonName><span style=3D'color:=
black'>m</span></st1:PersonName><span
style=3D'color:black'> 4 to al</span><st1:PersonName><span style=3D'color:b=
lack'>m</span></st1:PersonName><span
style=3D'color:black'>ost 11.<span style=3D'mso-spacerun:yes'>&nbsp; </span=
><o:p></o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p>

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          <p class=3DMsoNormal align=3Dcenter style=3D'text-align:center'>c=
ooking pot</p>
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   <v:line id=3D"_x0000_s2922" style=3D'position:absolute' from=3D"4230,116=
07" to=3D"6105,11607">
    <v:stroke startarrow=3D"open" endarrow=3D"open"/>
   </v:line><v:shape id=3D"_x0000_s2923" type=3D"#_x0000_t202" style=3D'pos=
ition:absolute;
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    <v:textbox>
     <![if !mso]>
     <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
      <tr>
       <td><![endif]>
       <div>
       <h3><span style=3D'mso-bidi-font-style:italic'>R<o:p></o:p></span></=
h3>
       </div>
       <![if !mso]></td>
      </tr>
     </table>
     <![endif]></v:textbox>
   </v:shape></v:group><v:group id=3D"_x0000_s2925" style=3D'position:absol=
ute;
   left:5664;top:10620;width:528;height:541' coordorigin=3D"5664,10620"
   coordsize=3D"528,541">
   <v:line id=3D"_x0000_s2921" style=3D'position:absolute' from=3D"5664,110=
15" to=3D"6120,11015">
    <v:stroke startarrow=3D"open" endarrow=3D"open"/>
   </v:line><v:shape id=3D"_x0000_s2924" type=3D"#_x0000_t202" style=3D'pos=
ition:absolute;
    left:5684;top:10620;width:508;height:541' filled=3D"f" stroked=3D"f">
    <v:textbox>
     <![if !mso]>
     <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
      <tr>
       <td><![endif]>
       <div>
       <p class=3DMsoNormal><i>r<o:p></o:p></i></p>
       </div>
       <![if !mso]></td>
      </tr>
     </table>
     <![endif]></v:textbox>
   </v:shape></v:group></v:group></v:group><![endif]--><![if !vml]><span
style=3D'mso-ignore:vglayout'>

<table cellpadding=3D0 cellspacing=3D0 align=3Dleft>
 <tr>
  <td width=3D107 height=3D14></td>
 </tr>
 <tr>
  <td></td>
  <td><img width=3D389 height=3D368
  src=3D"Therobustnessofreflectivesolarcookerrev2_files/image028.gif" v:sha=
pes=3D"_x0000_s2928 _x0000_s2920 _x0000_s2915 _x0000_s2913 _x0000_s2865 _x0=
000_s2866 _x0000_s2867 _x0000_s2868 _x0000_s2869 _x0000_s2870 _x0000_s2871 =
_x0000_s2872 _x0000_s2873 _x0000_s2874 _x0000_s2875 _x0000_s2876 _x0000_s28=
77 _x0000_s2878 _x0000_s2879 _x0000_s2880 _x0000_s2881 _x0000_s2882 _x0000_=
s2883 _x0000_s2884 _x0000_s2885 _x0000_s2886 _x0000_s2887 _x0000_s2888 _x00=
00_s2889 _x0000_s2890 _x0000_s2891 _x0000_s2892 _x0000_s2893 _x0000_s2894 _=
x0000_s2895 _x0000_s2896 _x0000_s2897 _x0000_s2898 _x0000_s2899 _x0000_s290=
0 _x0000_s2901 _x0000_s2902 _x0000_s2903 _x0000_s2904 _x0000_s2905 _x0000_s=
2906 _x0000_s2907 _x0000_s2908 _x0000_s2909 _x0000_s2910 _x0000_s2911 _x000=
0_s2912 _x0000_s2914 _x0000_s2919 _x0000_s2916 _x0000_s2918 _x0000_s2927 _x=
0000_s2926 _x0000_s2922 _x0000_s2923 _x0000_s2925 _x0000_s2921 _x0000_s2924=
"></td>
 </tr>
</table>

</span><![endif]><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'><o:p>&nbsp;</o:p></span></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'>Fig. 8<span style=3D'mso-spacerun:yes'>&nbsp; </=
span><span
style=3D'color:red'>Locus of equal-span</span> associated with a dark pot
consists of eight arcs.<o:p></o:p></span></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><o:p>&nbs=
p;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><span style=3D'mso-bidi-font-weight:bold'>In reality
elevation of the sun rarely, if ever, reaches 90&deg;.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The </span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>axi</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>u</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'>
elevation <i>e</i></span><st1:PersonName><sub><i><span style=3D'color:black=
'>m</span></i></sub></st1:PersonName><i><sub><span
style=3D'color:black'>ax</span></sub></i><span style=3D'color:black'> depen=
ds on
the latitude <i>L</i>, in both he</span><st1:PersonName><span style=3D'colo=
r:
 black'>m</span></st1:PersonName><span style=3D'color:black'>ispheres (nort=
h or
south):<o:p></o:p></span></p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><span style=3D'color:blac=
k'><sub><!--[if gte vml 1]><v:shape
 id=3D"_x0000_i1035" type=3D"#_x0000_t75" style=3D'width:2in;height:20.25pt=
' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image02=
9.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D192 height=3D27
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image030.gif" v:shape=
s=3D"_x0000_i1035"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1035"
  DrawAspect=3D"Content" ObjectID=3D"_1106821289">
 </o:OLEObject>
</xml><![endif]-->.<span style=3D'mso-tab-count:3'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>(7)<o:p></o:p></span></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></spa=
n></b></p>

<p class=3DMsoBodyText><span style=3D'color:black'>At our residence, </span=
><i><span
style=3D'mso-bidi-font-weight:bold'>L</span></i><span style=3D'mso-bidi-fon=
t-weight:
bold'>=3D37.5&deg;N.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Thus </s=
pan><i><span
style=3D'color:black'>e</span></i><st1:PersonName><sub><i><span style=3D'co=
lor:
 black'>m</span></i></sub></st1:PersonName><i><sub><span style=3D'color:bla=
ck'>ax</span></sub></i><span
style=3D'color:black'>=3D75&deg;</span><span style=3D'mso-bidi-font-weight:=
bold'>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The </span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>ini</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>u</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'> operating elevation <i>e</i></span><st=
1:PersonName><sub><i><span
 style=3D'mso-bidi-font-weight:bold'>m</span></i></sub></st1:PersonName><i>=
<sub><span
style=3D'mso-bidi-font-weight:bold'>in</span></sub></i><span style=3D'mso-b=
idi-font-weight:
bold'> depends on weather and terrain.<span style=3D'mso-spacerun:yes'>&nbs=
p;
</span>It is 25&deg; </span><span style=3D'color:black'>at our residence</s=
pan><span
style=3D'mso-bidi-font-weight:bold'>.<span style=3D'mso-spacerun:yes'>&nbsp;
</span>We chose the average of </span><st1:PersonName><span style=3D'mso-bi=
di-font-weight:
 bold'>m</span></st1:PersonName><span style=3D'mso-bidi-font-weight:bold'>a=
xi</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>u</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'> and </span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>ini</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>u</span><st1:PersonName><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'> elevation as the no</span><st1:PersonN=
ame><span
 style=3D'mso-bidi-font-weight:bold'>m</span></st1:PersonName><span
style=3D'mso-bidi-font-weight:bold'>inal elevation.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Therefore <i>e</i>=3D</span><span
style=3D'color:black'>50&deg;.<span style=3D'mso-spacerun:yes'>&nbsp; </spa=
n><o:p></o:p></span></p>

<p class=3DMsoBodyText><span style=3D'font-size:10.0pt;color:blue'><o:p>&nb=
sp;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'color:black'>When the sun is at the n=
o</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>inal
elevation, principal optical axis of the reflector should be parallel to the
sunlight (fig. 9), so as to </span><st1:PersonName><span style=3D'color:bla=
ck'>m</span></st1:PersonName><span
style=3D'color:black'>aintain a sharp focus. For </span><st1:PersonName><sp=
an
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>axi</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>u</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
> power,
</span>the opti<st1:PersonName>m</st1:PersonName>al ri<st1:PersonName>m</st=
1:PersonName>
again should <span style=3D'mso-bidi-font-weight:bold'>consist of tangent p=
oints
of the contour with respect to the incident sunlight. </span><span
style=3D'color:black'><span style=3D'mso-spacerun:yes'>&nbsp;&nbsp;</span>H=
owever
no parabolic surface fits such a ri</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>,
unless <i>e</i>=3D 90&deg;.<span style=3D'mso-spacerun:yes'>&nbsp; </span>T=
hus we
only de</span><st1:PersonName><span style=3D'color:black'>m</span></st1:Per=
sonName><span
style=3D'color:black'>and that the ri</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'>
intersects the locus of equal-span at a point </span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>ost
distant fro</span><st1:PersonName><span style=3D'color:black'>m</span></st1=
:PersonName><span
style=3D'color:black'> the optical axis.<span style=3D'mso-spacerun:yes'>&n=
bsp;
</span>Of two such points T and T*, the for</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>er is
chosen to yield a shorter focal length <i>f</i>.<o:p></o:p></span></p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'>Let </span><i><span
style=3D'font-family:Symbol'>r</span></i> be co<st1:PersonName>m</st1:Perso=
nName>ple<st1:PersonName>m</st1:PersonName>entary
of the no<st1:PersonName>m</st1:PersonName>inal elevation <i>e</i>; <i><span
style=3D'color:black'>R<sub>+</sub></span></i><span style=3D'color:black'> =
be the
reflector radius at intersection T; and <i>H</i> be the height of point T, =
</span><st1:PersonName><span
 style=3D'color:black'>m</span></st1:PersonName><span style=3D'color:black'=
>easured
fro</span><st1:PersonName><span style=3D'color:black'>m</span></st1:PersonN=
ame><span
style=3D'color:black'> the focal point along the principal axis (fig. 9). T=
hen<o:p></o:p></span></p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><span style=3D'color:blac=
k'><sub><!--[if gte vml 1]><v:shape
 id=3D"_x0000_i1036" type=3D"#_x0000_t75" style=3D'width:141pt;height:17.25=
pt' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image03=
1.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D188 height=3D23
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image032.gif" v:shape=
s=3D"_x0000_i1036"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1036"
  DrawAspect=3D"Content" ObjectID=3D"_1106821290">
 </o:OLEObject>
</xml><![endif]-->,<span style=3D'mso-tab-count:3'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>(8)<o:p></o:p></span></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><span style=3D'color:blac=
k'><sub><!--[if gte vml 1]><v:shape
 id=3D"_x0000_i1037" type=3D"#_x0000_t75" style=3D'width:197.25pt;height:17=
.25pt'
 o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image03=
3.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D263 height=3D23
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image034.gif" v:shape=
s=3D"_x0000_i1037"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1037"
  DrawAspect=3D"Content" ObjectID=3D"_1106821291">
 </o:OLEObject>
</xml><![endif]-->.<span style=3D'mso-tab-count:2'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </=
span>(9)<o:p></o:p></span></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><a name=3D"OLE_LINK1"><su=
b><!--[if gte vml 1]><v:shape
 id=3D"_x0000_i1038" type=3D"#_x0000_t75" style=3D'width:114.75pt;height:21=
.75pt'
 o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image03=
5.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D153 height=3D29
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image036.gif" v:shape=
s=3D"_x0000_i1038"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1038"
  DrawAspect=3D"Content" ObjectID=3D"_1106821292">
 </o:OLEObject>
</xml><![endif]-->.<span style=3D'mso-tab-count:4'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; </span>(10)</a></p>

<span style=3D'mso-bookmark:OLE_LINK1'></span>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText>As a concrete exa<st1:PersonName>m</st1:PersonName>p=
le,
let <i>r</i>=3D100 <st1:PersonName>m</st1:PersonName><st1:PersonName>m</st1=
:PersonName>;
<i>h</i>=3D115 <st1:PersonName>m</st1:PersonName><st1:PersonName>m</st1:Per=
sonName>;
<i>e</i>=3D50&deg;; <i><span style=3D'font-family:Symbol'>b</span></i>=3D15=
&deg;; and
<i><span style=3D'font-family:Symbol'>q</span></i>=3D30&deg;.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Then <i>H</i>=3D 69 <st1:PersonNam=
e>m</st1:PersonName><st1:PersonName>m</st1:PersonName>,
<i>R</i><sub>+</sub>=3D418 <st1:PersonName>m</st1:PersonName><st1:PersonNam=
e>m</st1:PersonName>,
and <i>f</i>=3D178 <st1:PersonName>m</st1:PersonName><st1:PersonName>m</st1=
:PersonName>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span></p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><!--[if gte vml 1]><v:group id=3D"_x0000_s3227" styl=
e=3D'position:absolute;
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   <v:line id=3D"_x0000_s3118" style=3D'position:absolute;flip:y' from=3D"6=
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    <v:stroke endarrow=3D"open"/>
   </v:line><v:line id=3D"_x0000_s3119" style=3D'position:absolute;flip:x' =
from=3D"6834,10365"
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    <v:stroke endarrow=3D"open"/>
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yle=3D'position:absolute;
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   <v:textbox>
    <![if !mso]>
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      <p class=3DMsoHeading7>H</p>
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      <![if !mso]></td>
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te;
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  <v:group id=3D"_x0000_s3132" style=3D'position:absolute;left:3090;top:654=
9;
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">
   <v:group id=3D"_x0000_s3128" style=3D'position:absolute;left:3090;top:76=
53;
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5">
    <v:group id=3D"_x0000_s3077" style=3D'position:absolute;left:3090;top:6=
973;
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45">
     <v:group id=3D"_x0000_s3033" style=3D'position:absolute;left:4020;top:=
6973;
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845">
      <v:group id=3D"_x0000_s3029" style=3D'position:absolute;left:4020;top=
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5845">
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p:6039;
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7"
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n:absolute;
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">
         <v:textbox style=3D'mso-next-textbox:#_x0000_s3019'>
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          <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
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            <p class=3DMsoNormal>T</p>
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            <![if !mso]></td>
           </tr>
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ft:4441;
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ft:4020;
        top:5087;width:5298;height:5845' coordorigin=3D"4020,5087" coordsiz=
e=3D"5298,5845">
        <v:group id=3D"_x0000_s3014" style=3D'position:absolute;left:4166;t=
op:5436;
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1,5482"
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top:10470;
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left:4166;
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ize=3D"3711,5482"
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          <v:group id=3D"_x0000_s2941" style=3D'position:absolute;left:5604=
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0,950"
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5560,7976"
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n:absolute;
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336"
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7;top:2413;
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3707,2092">
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39;
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5r68,81l1255,673r43,77l1337,849r43,146l1405,1149r5,176l1380,1552r-43,146l12=
72,1856r-64,107l1127,2066e"
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te;
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e:square;
             mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;
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e;
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5l235,r90,13l445,35r77,25l604,86r116,56l818,198r77,55l981,322r69,64l1127,48=
5r68,81l1255,673r43,77l1337,849r43,146l1405,1149r5,176l1380,1552r-43,146l12=
72,1856r-64,107l1127,2066e"
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             <v:path arrowok=3D"t"/>
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ion:absolute;
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            <v:shape id=3D"_x0000_s2981" style=3D'position:absolute;left:60=
39;
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             mso-wrap-distance-right:9pt;mso-wrap-distance-bottom:0;
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5l235,r90,13l445,35r77,25l604,86r116,56l818,198r77,55l981,322r69,64l1127,48=
5r68,81l1255,673r43,77l1337,849r43,146l1405,1149r5,176l1380,1552r-43,146l12=
72,1856r-64,107l1127,2066e"
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te;
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e:square;
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e;
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5l235,r90,13l445,35r77,25l604,86r116,56l818,198r77,55l981,322r69,64l1127,48=
5r68,81l1255,673r43,77l1337,849r43,146l1405,1149r5,176l1380,1552r-43,146l12=
72,1856r-64,107l1127,2066e"
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             <v:path arrowok=3D"t"/>
            </v:shape></v:group><v:shape id=3D"_x0000_s2983" style=3D'posit=
ion:absolute;
            left:7492;top:4497;width:101;height:465;rotation:503448fd;
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            mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
            mso-wrap-distance-bottom:0;mso-position-horizontal:absolute;
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45,435"
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           </v:shape><v:shape id=3D"_x0000_s2984" style=3D'position:absolut=
e;
            left:4318;top:4488;width:94;height:465;rotation:652245fd;flip:x;
            mso-wrap-style:square;mso-wrap-distance-left:9pt;
            mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
            mso-wrap-distance-bottom:0;mso-position-horizontal:absolute;
            mso-position-vertical:absolute;v-text-anchor:top' coordsize=3D"=
45,435"
            path=3D"m,l30,105,45,255,38,375,23,435e" filled=3D"f">
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           </v:shape><v:shape id=3D"_x0000_s2985" style=3D'position:absolut=
e;
            left:5514;top:2336;width:944;height:141;rotation:-187159fd;flip=
:y;
            mso-wrap-style:square;mso-wrap-distance-left:9pt;
            mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
            mso-wrap-distance-bottom:0;mso-position-horizontal:absolute;
            mso-position-vertical:absolute;v-text-anchor:top' coordsize=3D"=
894,51"
            path=3D"m,l72,12r78,15l249,39r90,6l417,51r87,l606,51r87,-3l828,=
33r66,-6e"
            filled=3D"f">
            <v:path arrowok=3D"t"/>
           </v:shape></v:group><v:line id=3D"_x0000_s2989" style=3D'positio=
n:absolute'
           from=3D"6045,5087" to=3D"6045,10442" o:regroupid=3D"283">
           <v:stroke startarrow=3D"open"/>
          </v:line><v:shape id=3D"_x0000_s2990" type=3D"#_x0000_t202" style=
=3D'position:absolute;
           left:6081;top:4960;width:560;height:519' o:regroupid=3D"283" fil=
led=3D"f"
           stroked=3D"f">
           <v:textbox style=3D'mso-next-textbox:#_x0000_s2990'>
            <![if !mso]>
            <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
             <tr>
              <td><![endif]>
              <div>
              <p class=3DMsoNormal>Z</p>
              </div>
              <![if !mso]></td>
             </tr>
            </table>
            <![endif]></v:textbox>
          </v:shape></v:group></v:group><v:group id=3D"_x0000_s3026" style=
=3D'position:absolute;
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1"
         coordsize=3D"5298,5631">
         <v:line id=3D"_x0000_s2999" style=3D'position:absolute;flip:y' fro=
m=3D"4020,5747"
          to=3D"8483,10219" o:regroupid=3D"293" strokecolor=3D"blue">
          <v:stroke dashstyle=3D"dashDot"/>
         </v:line><v:shape id=3D"_x0000_s3010" style=3D'position:absolute;l=
eft:3300;
          top:7822;width:4848;height:1372;rotation:2982981fd;mso-wrap-style=
:square;
          mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;
          mso-wrap-distance-right:9pt;mso-wrap-distance-bottom:0;
          v-text-anchor:top' coordsize=3D"4943,1550" o:regroupid=3D"293" pa=
th=3D"m,15c840,782,1681,1550,2505,1548,3329,1546,4136,773,4943,e"
          filled=3D"f" strokecolor=3D"blue" strokeweight=3D"2.25pt">
          <v:path arrowok=3D"t"/>
         </v:shape><v:shape id=3D"_x0000_s3022" type=3D"#_x0000_t202" style=
=3D'position:absolute;
          left:7497;top:5301;width:1821;height:384' o:regroupid=3D"289" fil=
led=3D"f"
          stroked=3D"f">
          <v:textbox style=3D'mso-next-textbox:#_x0000_s3022'>
           <![if !mso]>
           <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
            <tr>
             <td><![endif]>
             <div>
             <p class=3DMsoNormal><span style=3D'color:blue'>Principal Axis=
<o:p></o:p></span></p>
             </div>
             <![if !mso]></td>
            </tr>
           </table>
           <![endif]></v:textbox>
         </v:shape></v:group><v:group id=3D"_x0000_s3027" style=3D'position=
:absolute;
         left:4020;top:5087;width:5178;height:5673' coordorigin=3D"4020,508=
7"
         coordsize=3D"5178,5673">
         <v:group id=3D"_x0000_s3015" style=3D'position:absolute;left:4020;=
top:5087;
          width:4612;height:5673' coordorigin=3D"4020,5087" coordsize=3D"46=
12,5673"
          o:regroupid=3D"292">
          <v:line id=3D"_x0000_s3000" style=3D'position:absolute;flip:y' fr=
om=3D"4020,5087"
           to=3D"5745,6806" o:regroupid=3D"287" strokecolor=3D"red">
           <v:stroke startarrow=3D"open"/>
          </v:line><v:line id=3D"_x0000_s3003" style=3D'position:absolute;f=
lip:y'
           from=3D"6907,9041" to=3D"8632,10760" o:regroupid=3D"287" strokec=
olor=3D"red">
           <v:stroke startarrow=3D"open"/>
          </v:line></v:group><v:shape id=3D"_x0000_s3024" type=3D"#_x0000_t=
202"
          style=3D'position:absolute;left:8109;top:8658;width:1089;height:4=
29'
          o:regroupid=3D"288" filled=3D"f" stroked=3D"f">
          <v:textbox style=3D'mso-next-textbox:#_x0000_s3024'>
           <![if !mso]>
           <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
            <tr>
             <td><![endif]>
             <div>
             <p class=3DMsoNormal><span style=3D'color:red'>Incidence<o:p><=
/o:p></span></p>
             </div>
             <![if !mso]></td>
            </tr>
           </table>
           <![endif]></v:textbox>
         </v:shape></v:group></v:group></v:group><v:group id=3D"_x0000_s303=
2"
       style=3D'position:absolute;left:6045;top:7335;width:885;height:630'
       coordorigin=3D"6045,7335" coordsize=3D"885,630">
       <v:shape id=3D"_x0000_s3030" type=3D"#_x0000_t202" style=3D'position=
:absolute;
        left:6120;top:7335;width:810;height:630' filled=3D"f" stroked=3D"f">
        <v:textbox>
         <![if !mso]>
         <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
          <tr>
           <td><![endif]>
           <div>
           <p class=3DMsoNormal><i><span style=3D'font-family:Symbol;color:=
green'>r<o:p></o:p></span></i></p>
           </div>
           <![if !mso]></td>
          </tr>
         </table>
         <![endif]></v:textbox>
       </v:shape><v:shape id=3D"_x0000_s3031" style=3D'position:absolute;le=
ft:6045;
        top:7650;width:360;height:165;mso-wrap-style:square;
        mso-wrap-distance-left:9pt;mso-wrap-distance-top:0;
        mso-wrap-distance-right:9pt;mso-wrap-distance-bottom:0;v-text-ancho=
r:top'
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0,90e"
        filled=3D"f" strokecolor=3D"green">
        <v:path arrowok=3D"t"/>
       </v:shape></v:group></v:group><v:group id=3D"_x0000_s3076" style=3D'=
position:absolute;
      left:3090;top:9570;width:6315;height:1095' coordorigin=3D"3090,9570"
      coordsize=3D"6315,1095">
      <v:group id=3D"_x0000_s3072" style=3D'position:absolute;left:3090;top=
:9765;
       width:6315;height:900' coordorigin=3D"3090,9765" coordsize=3D"6315,9=
00">
       <v:line id=3D"_x0000_s3070" style=3D'position:absolute' from=3D"3090=
,10095"
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        <v:stroke endarrow=3D"open"/>
       </v:line><v:shape id=3D"_x0000_s3071" type=3D"#_x0000_t202" style=3D=
'position:absolute;
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        <v:textbox>
         <![if !mso]>
         <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
          <tr>
           <td><![endif]>
           <div>
           <p class=3DMsoNormal>Y</p>
           </div>
           <![if !mso]></td>
          </tr>
         </table>
         <![endif]></v:textbox>
       </v:shape></v:group><v:group id=3D"_x0000_s3075" style=3D'position:a=
bsolute;
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       coordsize=3D"780,795">
       <v:shape id=3D"_x0000_s3073" style=3D'position:absolute;left:6510;to=
p:9645;
        width:172;height:450;mso-wrap-style:square;mso-wrap-distance-left:9=
pt;
        mso-wrap-distance-top:0;mso-wrap-distance-right:9pt;
        mso-wrap-distance-bottom:0;v-text-anchor:top' coordsize=3D"172,450"
        path=3D"m,c64,67,128,135,150,210v22,75,3,157,-15,240e" filled=3D"f"
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        <v:path arrowok=3D"t"/>
       </v:shape><v:shape id=3D"_x0000_s3074" type=3D"#_x0000_t202" style=
=3D'position:absolute;
        left:6600;top:9570;width:690;height:795' filled=3D"f" stroked=3D"f">
        <v:textbox>
         <![if !mso]>
         <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
          <tr>
           <td><![endif]>
           <div>
           <p class=3DMsoNormal><i><span style=3D'color:blue'>e<o:p></o:p><=
/span></i></p>
           </div>
           <![if !mso]></td>
          </tr>
         </table>
         <![endif]></v:textbox>
       </v:shape></v:group></v:group></v:group><v:group id=3D"_x0000_s3127"
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     coordorigin=3D"4958,7793" coordsize=3D"1672,1687">
     <v:line id=3D"_x0000_s3124" style=3D'position:absolute;flip:x y' from=
=3D"4958,7793"
      to=3D"5550,8385" strokecolor=3D"blue" strokeweight=3D".25pt">
      <v:stroke endarrow=3D"open"/>
     </v:line><v:line id=3D"_x0000_s3125" style=3D'position:absolute;flip:x=
 y'
      from=3D"5910,8745" to=3D"6630,9480" strokecolor=3D"blue" strokeweight=
=3D".25pt">
      <v:stroke startarrow=3D"open"/>
     </v:line><v:shape id=3D"_x0000_s3126" type=3D"#_x0000_t202" style=3D'p=
osition:absolute;
      left:5505;top:8401;width:1065;height:922' filled=3D"f" stroked=3D"f">
      <v:textbox>
       <![if !mso]>
       <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
        <tr>
         <td><![endif]>
         <div>
         <p class=3DMsoNormal><i><span style=3D'color:blue'>R</span></i><su=
b><span
         style=3D'color:blue'>+<o:p></o:p></span></sub></p>
         </div>
         <![if !mso]></td>
        </tr>
       </table>
       <![endif]></v:textbox>
     </v:shape></v:group></v:group><v:group id=3D"_x0000_s3131" style=3D'po=
sition:absolute;
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      <![if !mso]>
      <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
       <tr>
        <td><![endif]>
        <div>
        <p class=3DMsoNormal><span style=3D'color:blue'>T<sup>*<o:p></o:p><=
/sup></span></p>
        </div>
        <![if !mso]></td>
       </tr>
      </table>
      <![endif]></v:textbox>
    </v:shape></v:group></v:group><v:group id=3D"_x0000_s3144" style=3D'pos=
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     <![if !mso]>
     <table cellpadding=3D0 cellspacing=3D0 width=3D"100%">
      <tr>
       <td><![endif]>
       <div>
       <p class=3DMsoNormal><i><span style=3D'color:blue'>f<o:p></o:p></spa=
n></i></p>
       </div>
       <![if !mso]></td>
      </tr>
     </table>
     <![endif]></v:textbox>
   </v:shape></v:group></v:group></v:group><![endif]--><![if !vml]><span
style=3D'mso-ignore:vglayout'>

<table cellpadding=3D0 cellspacing=3D0 align=3Dleft>
 <tr>
  <td width=3D85 height=3D3></td>
 </tr>
 <tr>
  <td></td>
  <td><img width=3D424 height=3D391
  src=3D"Therobustnessofreflectivesolarcookerrev2_files/image037.gif" v:sha=
pes=3D"_x0000_s3227 _x0000_s3226 _x0000_s3120 _x0000_s3115 _x0000_s3116 _x0=
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_x0000_s3077 _x0000_s3033 _x0000_s3029 _x0000_s3020 _x0000_s3019 _x0000_s30=
18 _x0000_s3028 _x0000_s3014 _x0000_s2986 _x0000_s3002 _x0000_s2941 _x0000_=
s2942 _x0000_s2943 _x0000_s2944 _x0000_s2976 _x0000_s2977 _x0000_s2978 _x00=
00_s2979 _x0000_s2980 _x0000_s2981 _x0000_s2982 _x0000_s2983 _x0000_s2984 _=
x0000_s2985 _x0000_s2989 _x0000_s2990 _x0000_s3026 _x0000_s2999 _x0000_s301=
0 _x0000_s3022 _x0000_s3027 _x0000_s3015 _x0000_s3000 _x0000_s3003 _x0000_s=
3024 _x0000_s3032 _x0000_s3030 _x0000_s3031 _x0000_s3076 _x0000_s3072 _x000=
0_s3070 _x0000_s3071 _x0000_s3075 _x0000_s3073 _x0000_s3074 _x0000_s3127 _x=
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</table>

</span><![endif]><span style=3D'color:black'><o:p>&nbsp;</o:p></span></p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'color:black'><o:p>&nbsp;</o:p></span>=
</p>

<p class=3DMsoBodyText><span style=3D'font-size:10.0pt;color:blue'><o:p>&nb=
sp;</o:p></span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText style=3D'margin-left:76.5pt;text-indent:-40.5pt'><o:=
p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><span
style=3D'font-size:10.0pt'>Fig. 9<span style=3D'mso-spacerun:yes'>&nbsp; </=
span>A
parabolic surface opti</span><st1:PersonName><span style=3D'font-size:10.0p=
t'>m</span></st1:PersonName><span
style=3D'font-size:10.0pt'>ized for a predeter</span><st1:PersonName><span
 style=3D'font-size:10.0pt'>m</span></st1:PersonName><span style=3D'font-si=
ze:10.0pt'>ined
no</span><st1:PersonName><span style=3D'font-size:10.0pt'>m</span></st1:Per=
sonName><span
style=3D'font-size:10.0pt'>inal elevation <i>e</i><o:p></o:p></span></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>The opti<st1:PersonName>m</st1:PersonName>al ri<st1:=
PersonName>m</st1:PersonName>
is the intersection between the parabolic surface and the appropriate locus=
 of
equal tolerance. It is neither axisy<st1:PersonName>m</st1:PersonName><st1:=
PersonName>m</st1:PersonName>etric
nor coplanar.<span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>It is best
described point-by-point, as follows: </p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText style=3D'margin-left:.25in;text-indent:-.25in;mso-li=
st:l2 level1 lfo8;
tab-stops:list .25in'><![if !supportLists]><span style=3D'mso-list:Ignore'>=
1.<span
style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </spa=
n></span><![endif]>Let
<i>XYZ</i> be a Cartesian coordinate syste<st1:PersonName>m</st1:PersonName>
fixed to the cookware, where <i>Z</i> is the axis of sy<st1:PersonName>m</s=
t1:PersonName><st1:PersonName>m</st1:PersonName>etry.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Let <i>xyz</i> be a Cartesian coor=
dinate
syste<st1:PersonName>m</st1:PersonName> fixed to the parabolic surface, whe=
re <i>z</i>
is the principal optical axis.<span style=3D'mso-spacerun:yes'>&nbsp; </spa=
n><i>X</i>
and <i>x</i> are congruent.<span style=3D'mso-spacerun:yes'>&nbsp; </span><=
i>Z</i>
and <i>z</i> are at an angle<i><span style=3D'font-family:Symbol'> r</span>=
</i>.</p>

<p class=3DMsoBodyText style=3D'margin-left:.25in;text-indent:-.25in;mso-li=
st:l2 level1 lfo8;
tab-stops:list .25in'><![if !supportLists]><span style=3D'mso-list:Ignore'>=
2.<span
style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </spa=
n></span><![endif]>Obtain
an equation of the parabolic surface in the <i>xyz</i> coordinate syste<st1=
:PersonName>m</st1:PersonName>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Then transfor<st1:PersonName>m</st=
1:PersonName>
the equation into the <i>XYZ</i> coordinate syste<st1:PersonName>m</st1:Per=
sonName>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span></p>

<p class=3DMsoBodyText style=3D'margin-left:.25in;text-indent:-.25in;mso-li=
st:l2 level1 lfo8;
tab-stops:list .25in'><![if !supportLists]><span style=3D'mso-list:Ignore'>=
3.<span
style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </spa=
n></span><![endif]>Consider
a series of cross-sections perpendicular to the <i>Z</i>-axis.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>In each cross-section the contour =
beco<st1:PersonName>m</st1:PersonName>es
a circle; the parabolic surface beco<st1:PersonName>m</st1:PersonName>es an
ellipse.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Both are both quadra=
tic in
<i>X</i> and <i>Y</i>. Eli<st1:PersonName>m</st1:PersonName>inate <i>X</i> =
by
subtraction.<span style=3D'mso-spacerun:yes'>&nbsp; </span>A quadratic equa=
tion
in <i>Y</i> is obtained.<span style=3D'mso-spacerun:yes'>&nbsp; </span>Of t=
he two
real solutions, take the one with lower value.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Now that both <i>Y</i> and <i>Z</i=
> are
known, <i>X</i> can be solved in the equation of the circle.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Two points (&plusmn;<i>X</i>,<i>Y<=
/i>,<i>Z</i>)
are found on the ri<st1:PersonName>m</st1:PersonName>.</p>

<p class=3DMsoBodyText style=3D'margin-left:.25in;text-indent:-.25in;mso-li=
st:l2 level1 lfo8;
tab-stops:list .25in'><![if !supportLists]><span style=3D'mso-list:Ignore'>=
4.<span
style=3D'font:7.0pt "Times New Roman"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </spa=
n></span><![endif]>A
series of points (&plusmn;<i>X</i>,<i>Y</i>,<i>Z</i>) describes the opti<st=
1:PersonName>m</st1:PersonName>al
ri<st1:PersonName>m</st1:PersonName> in the <i>XYZ</i> coordinate syste<st1=
:PersonName>m</st1:PersonName>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>It should be transfor<st1:PersonNa=
me>m</st1:PersonName>ed
into the <i>xyz</i> coordinate syste<st1:PersonName>m</st1:PersonName>.<span
style=3D'mso-spacerun:yes'>&nbsp; </span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>For the exa<st1:PersonName>m</st1:PersonName>ple cit=
ed
above, a projection of the opti<st1:PersonName>m</st1:PersonName>al ri<st1:=
PersonName>m</st1:PersonName>
in the <i>xy</i>-plane is shown by a solid curve in fig. 10.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>It consists of four lopes.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>It is sy<st1:PersonName>m</st1:Per=
sonName><st1:PersonName>m</st1:PersonName>etric
about the <i>y</i>-axis, but not about the <i>x</i>-axis.</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoNormal><b style=3D'mso-bidi-font-weight:normal'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>Co</span></b><st1:Pers=
onName><b
 style=3D'mso-bidi-font-weight:normal'><span style=3D'font-size:12.0pt;mso-=
bidi-font-size:
 10.0pt'>m</span></b></st1:PersonName><b style=3D'mso-bidi-font-weight:norm=
al'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>pro</span></b><st1:Per=
sonName><b
 style=3D'mso-bidi-font-weight:normal'><span style=3D'font-size:12.0pt;mso-=
bidi-font-size:
 10.0pt'>m</span></b></st1:PersonName><b style=3D'mso-bidi-font-weight:norm=
al'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>ise on the Ri</span></=
b><st1:PersonName><b
 style=3D'mso-bidi-font-weight:normal'><span style=3D'font-size:12.0pt;mso-=
bidi-font-size:
 10.0pt'>m</span></b></st1:PersonName><b style=3D'mso-bidi-font-weight:norm=
al'><span
style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'> Shape<o:p></o:p></spa=
n></b></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>The great circle in fig. 4a is duplicated in fig. 10=
, as a
dashed curve.<span style=3D'mso-spacerun:yes'>&nbsp; </span>It is not congr=
uent
with the four-loped curve.<span style=3D'mso-spacerun:yes'>&nbsp; </span>In=
 order
to <st1:PersonName>m</st1:PersonName>atch <st1:PersonName>m</st1:PersonName=
>axi<st1:PersonName>m</st1:PersonName>u<st1:PersonName>m</st1:PersonName>
radius <i>R<sub>+</sub></i> of the four-loped curve with <i>R</i><sub>o</su=
b><i>
</i>of the great circle,<span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </spa=
n></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><sub><!--[if gte vml 1]><=
v:shape
 id=3D"_x0000_i1039" type=3D"#_x0000_t75" style=3D'width:39pt;height:17.25p=
t' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image03=
8.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D52 height=3D23
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image039.gif" v:shape=
s=3D"_x0000_i1039"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1039"
  DrawAspect=3D"Content" ObjectID=3D"_1106821293">
 </o:OLEObject>
</xml><![endif]-->.<span style=3D'mso-tab-count:6'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; </span>(11)</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>In the exa<st1:PersonName>m</st1:PersonName>ple abov=
e, <i>e</i>=3D50&deg;.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Thus <i><span style=3D'font-family=
:Symbol'>q</span></i>
<sub><!--[if gte vml 1]><v:shape id=3D"_x0000_i1040" type=3D"#_x0000_t75" s=
tyle=3D'width:9.75pt;
 height:9.75pt' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image04=
0.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D13 height=3D13
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image041.gif" v:shape=
s=3D"_x0000_i1040"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1040"
  DrawAspect=3D"Content" ObjectID=3D"_1106821294">
 </o:OLEObject>
</xml><![endif]-->25&deg;.<span style=3D'mso-spacerun:yes'>&nbsp; </span>In=
 order
to <st1:PersonName>m</st1:PersonName>atch <st1:PersonName>m</st1:PersonName=
>ini<st1:PersonName>m</st1:PersonName>u<st1:PersonName>m</st1:PersonName>
radius <i>R<sub>-</sub></i> (near the <i>x</i>-axis in fig. 10) with <i>R</=
i><sub>o</sub>,
<i><span style=3D'font-family:Symbol'>q</span></i> <sub><!--[if gte vml 1]>=
<v:shape
 id=3D"_x0000_i1041" type=3D"#_x0000_t75" style=3D'width:9.75pt;height:9.75=
pt' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image04=
0.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D13 height=3D13
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image041.gif" v:shape=
s=3D"_x0000_i1041"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1041"
  DrawAspect=3D"Content" ObjectID=3D"_1106821295">
 </o:OLEObject>
</xml><![endif]-->45&deg;. A good co<st1:PersonName>m</st1:PersonName>pro<s=
t1:PersonName>m</st1:PersonName>ise
on <i><span style=3D'font-family:Symbol'>q</span></i> is about 30&deg;.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>A deeper pot loses <st1:PersonName=
>m</st1:PersonName>ore
heat through natural convection.<span style=3D'mso-spacerun:yes'>&nbsp; </s=
pan>A
shallower pot <st1:PersonName>m</st1:PersonName>akes the four-loped curve
narrower near the <i>x</i>-axis.</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>In addition to angular tolerance in two critical
directions, <st1:PersonName>m</st1:PersonName>any other factors should be
considered, e.g., power, raw-<st1:PersonName>m</st1:PersonName>aterial cons=
u<st1:PersonName>m</st1:PersonName>ption,
bulk and weight of the product, <st1:PersonName>m</st1:PersonName>echanical
stability, ease of asse<st1:PersonName>m</st1:PersonName>bly, and appearanc=
e.
As a rule of thu<st1:PersonName>m</st1:PersonName>b, the ri<st1:PersonName>=
m</st1:PersonName>
should be free of sharp kinks, which are present in the four-loped curve.<s=
pan
style=3D'mso-spacerun:yes'>&nbsp; </span>The kinks reduce power without sav=
ing
raw <st1:PersonName>m</st1:PersonName>aterial or reducing the bulk. However
they do cause stress-concentration which pro<st1:PersonName>m</st1:PersonNa=
me>otes
distortion and crack. </p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>The projection of a good solution is shown by a dott=
ed
curve in fig. 10.<span style=3D'mso-spacerun:yes'>&nbsp; </span>It is an el=
lipse
slightly offset fro<st1:PersonName>m</st1:PersonName> the <i>x</i>-axis.<sp=
an
style=3D'mso-spacerun:yes'>&nbsp; </span>It is tangent to the four-loped cu=
rve on
the <i>y</i>-axis; and halfway between the four-loped curve and the great c=
ircle
on and near the <i>x</i>-axis.</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><!--[if gte vml 1]><v:group id=3D"_x0000_s3140" styl=
e=3D'position:absolute;
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pan></i><i><span
         style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>x<o:p></o:p><=
/span></i></p>
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         <![if !mso]></td>
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         <p class=3DMsoNormal><i><span style=3D'font-size:12.0pt;mso-bidi-f=
ont-size:
         10.0pt'>y<o:p></o:p></span></i></p>
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         <![if !mso]></td>
        </tr>
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</span><![endif]><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText align=3Dcenter style=3D'text-align:center'><o:p>&nbs=
p;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<br style=3D'mso-ignore:vglayout' clear=3DALL>

<p class=3DMsoBodyText style=3D'margin-left:94.5pt;text-indent:-31.5pt'><sp=
an
style=3D'font-size:10.0pt'>Fig. 10<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Projections of an opti</span><st1:PersonName><span style=3D'font-siz=
e:
 10.0pt'>m</span></st1:PersonName><span style=3D'font-size:10.0pt'>al ri</s=
pan><st1:PersonName><span
 style=3D'font-size:10.0pt'>m</span></st1:PersonName><span style=3D'font-si=
ze:10.0pt'>
in the <i>xy</i>-plane<o:p></o:p></span></p>

<p class=3DMsoBodyText style=3D'margin-left:94.5pt'><span style=3D'font-siz=
e:10.0pt'>i)
for tolerances across the Z-axis (dashed curve);<o:p></o:p></span></p>

<p class=3DMsoBodyText style=3D'margin-left:94.5pt;text-indent:-31.5pt;tab-=
stops:
1.0in 1.5in'><span style=3D'font-size:10.0pt'><span
style=3D'mso-spacerun:yes'>&nbsp;</span><span style=3D'mso-tab-count:2'>&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </spa=
n>ii)
for tolerances along the Z-axis (solid curve); and<o:p></o:p></span></p>

<p class=3DMsoBodyText style=3D'margin-left:94.5pt;text-indent:-31.5pt;tab-=
stops:
1.0in 1.5in'><span style=3D'font-size:10.0pt'><span style=3D'mso-tab-count:=
2'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; </span>iii)
a good co</span><st1:PersonName><span style=3D'font-size:10.0pt'>m</span></=
st1:PersonName><span
style=3D'font-size:10.0pt'>pro</span><st1:PersonName><span style=3D'font-si=
ze:10.0pt'>m</span></st1:PersonName><span
style=3D'font-size:10.0pt'>ise (dotted curve) of the two solutions. <o:p></=
o:p></span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>A si<st1:PersonName>m</st1:PersonName>pler, and slig=
htly
less robust alternative can be obtained with plotting the great circle and =
the
four-loped curve.<span style=3D'mso-spacerun:yes'>&nbsp; </span>The project=
ion of
this solution on the <i>xy</i>-plane is an ellipse centered at the origin:<=
/p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><sub><!--[if gte vml 1]><=
v:shape
 id=3D"_x0000_i1042" type=3D"#_x0000_t75" style=3D'width:141.75pt;height:36=
.75pt'
 o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image04=
5.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D189 height=3D49
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image046.gif" v:shape=
s=3D"_x0000_i1042"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1042"
  DrawAspect=3D"Content" ObjectID=3D"_1106821297">
 </o:OLEObject>
</xml><![endif]-->,<span style=3D'mso-tab-count:3'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>(12)</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>where</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><sub><!--[if gte vml 1]><=
v:shape
 id=3D"_x0000_i1043" type=3D"#_x0000_t75" style=3D'width:89.25pt;height:17.=
25pt'
 o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image04=
7.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D119 height=3D23
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image048.gif" v:shape=
s=3D"_x0000_i1043"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1043"
  DrawAspect=3D"Content" ObjectID=3D"_1106821299">
 </o:OLEObject>
</xml><![endif]-->.<span style=3D'mso-tab-count:5'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>(13)=
</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>A fa<st1:PersonName>m</st1:PersonName>ily of still s=
i<st1:PersonName>m</st1:PersonName>pler,
and less robust solutions features an axisy<st1:PersonName>m</st1:PersonNam=
e><st1:PersonName>m</st1:PersonName>etric
ri<st1:PersonName>m</st1:PersonName>.<span style=3D'mso-spacerun:yes'>&nbsp;
</span>The ri<st1:PersonName>m</st1:PersonName> passes through (<i>R<sub>a<=
/sub></i>,<i>H</i>)
in the <i>yz</i>-plane, where <i>R<sub>a</sub></i> is between <i>R</i><sub>=
o</sub>
and <i>R</i><sub>+</sub>, <i>H</i> is given by eqn. (8).<span
style=3D'mso-spacerun:yes'>&nbsp; </span>The focal length <i>f</i> is calcu=
lated
by substituting <i>R</i><sub>+</sub> by <i>R<sub>a</sub></i> in eqn. (10).<=
span
style=3D'mso-spacerun:yes'>&nbsp; </span></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>Many other solutions are possible.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Once projection of the ri<st1:Pers=
onName>m</st1:PersonName>
is deter<st1:PersonName>m</st1:PersonName>ined, three-di<st1:PersonName>m</=
st1:PersonName>ensional
description of the ri<st1:PersonName>m</st1:PersonName> can be obtained by:=
</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText style=3D'margin-left:.5in'><sub><!--[if gte vml 1]><=
v:shape
 id=3D"_x0000_i1044" type=3D"#_x0000_t75" style=3D'width:81pt;height:35.25p=
t' o:ole=3D"">
 <v:imagedata src=3D"Therobustnessofreflectivesolarcookerrev2_files/image04=
9.wmz"
  o:title=3D""/>
</v:shape><![endif]--><![if !vml]><img width=3D108 height=3D47
src=3D"Therobustnessofreflectivesolarcookerrev2_files/image050.gif" v:shape=
s=3D"_x0000_i1044"><![endif]></sub><!--[if gte mso 9]><xml>
 <o:OLEObject Type=3D"Embed" ProgID=3D"Equation.3" ShapeID=3D"_x0000_i1044"
  DrawAspect=3D"Content" ObjectID=3D"_1106821300">
 </o:OLEObject>
</xml><![endif]-->.<span style=3D'mso-tab-count:5'>&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp; </span>(14)</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><b><o:p>&nbsp;</o:p></b></p>

<p class=3DMsoBodyText><b>Su</b><st1:PersonName><b>m</b></st1:PersonName><s=
t1:PersonName><b>m</b></st1:PersonName><b>ary<o:p></o:p></b></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText>The <i>robustness</i> of a reflective solar cooker is
characterized by <i>angular tolerance</i> of its reflector, especially along
the ri<st1:PersonName>m</st1:PersonName>.<span style=3D'mso-spacerun:yes'>&=
nbsp;
</span>The angular tolerance usually increases toward the cookware.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>Thus the reflector should cuddle a=
round
the cookware.<span style=3D'mso-spacerun:yes'>&nbsp; </span>A parabolic sur=
face is
not ideal, but very suitable for unattended cooking.<span
style=3D'mso-spacerun:yes'>&nbsp; </span>With the focal point fixed at the =
center
of the pot, any point on the reflecting surface deter<st1:PersonName>m</st1=
:PersonName>ines
the parabola co<st1:PersonName>m</st1:PersonName>pletely (through equations=
 10
and 14).<span style=3D'mso-spacerun:yes'>&nbsp; </span>Therefore shape and
position of the ri<st1:PersonName>m</st1:PersonName> cannot be arbitrarily
assigned.<span style=3D'mso-spacerun:yes'>&nbsp;&nbsp; </span>To opti<st1:P=
ersonName>m</st1:PersonName>ize
the reflector, we consider angular tolerance in two critical directions, and
obtain two conflicting solutions.<span style=3D'mso-spacerun:yes'>&nbsp;
</span>Their difference is <st1:PersonName>m</st1:PersonName>ini<st1:Person=
Name>m</st1:PersonName>ized
by opti<st1:PersonName>m</st1:PersonName>izing the depth of the cookware.<s=
pan
style=3D'mso-spacerun:yes'>&nbsp; </span>In <st1:PersonName>m</st1:PersonNa=
me>aking
the final co<st1:PersonName>m</st1:PersonName>pro<st1:PersonName>m</st1:Per=
sonName>ise,
<st1:PersonName>m</st1:PersonName>any other factors <st1:PersonName>m</st1:=
PersonName>ust
be consider.<span style=3D'mso-spacerun:yes'>&nbsp; </span>The ri<st1:Perso=
nName>m</st1:PersonName>
of a robust reflector is a three-di<st1:PersonName>m</st1:PersonName>ension=
al
curve rese<st1:PersonName>m</st1:PersonName>bling the edge of a slightly be=
nt
potato chip.</p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><o:p>&nbsp;</o:p></p>

<p class=3DMsoBodyText><b>References<o:p></o:p></b></p>

<p class=3DMsoBodyText style=3D'margin-left:.25in'><b><o:p>&nbsp;</o:p></b>=
</p>

<ol style=3D'margin-top:0in' start=3D1 type=3D1>
 <li class=3DMsoNormal style=3D'mso-list:l3 level1 lfo4;tab-stops:list .5in=
'><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>&#8220;A Parabolic
     Solar Cooker for Unattended Cooking,&#8221; by Li-Yan Zhu and Yun K. K=
i</span><st1:PersonName><span
      style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></st1:Pe=
rsonName><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>, <a
     href=3D"http://solarcooking.org/unattendedparabolic.htm"><span
     style=3D'text-decoration:none;text-underline:none'>http://solarcooking=
.org/unattendedparabolic.htm</span></a>
     April, 2002<o:p></o:p></span></li>
 <li class=3DMsoNormal style=3D'mso-list:l3 level1 lfo4;tab-stops:list .5in=
'><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>&#8220;An Align</=
span><st1:PersonName><span
      style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></st1:Pe=
rsonName><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>ent Te</span><st1=
:PersonName><span
      style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></st1:Pe=
rsonName><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>plate for Unatten=
ded
     Solar Cooking,&#8221; by Li-Yan Zhu and Yun K. Ki</span><st1:PersonNam=
e><span
      style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>m</span></st1:Pe=
rsonName><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>, <span
     style=3D'color:blue'>http://solarcooking.org/UnattendedAlign</span></s=
pan><st1:PersonName><span
      style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;color:blue'>m</sp=
an></st1:PersonName><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;color:blue'>ent.ht=
</span><st1:PersonName><span
      style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt;color:blue'>m</sp=
an></st1:PersonName><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'> June, 2002<o:p><=
/o:p></span></li>
 <li class=3DMsoNormal style=3D'mso-list:l3 level1 lfo4;tab-stops:list .5in=
'><span
     style=3D'font-size:12.0pt;mso-bidi-font-size:10.0pt'>&#8220;Making a
     Parabolic Reflector Out of a Flat Sheet,&#8221; by Li-Yan Zhu, <a
     href=3D"http://solarcooking.org/parabolic-from-flat-sheet.htm">http://=
solarcooking.org/parabolic-from-flat-sheet.htm</a>
     April, 2002<span style=3D'mso-spacerun:yes'>&nbsp; </span><o:p></o:p><=
/span></li>
</ol>

<p class=3DMsoNormal style=3D'margin-left:.25in'><span style=3D'font-size:1=
2.0pt;
mso-bidi-font-size:10.0pt'><o:p>&nbsp;</o:p></span></p>

</div>

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<p class=3DMsoHeader>Robustness of a Reflective Solar Cooker<span
style=3D'mso-tab-count:2'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; </span>Revised
<st1:date Year=3D"2003" Day=3D"15" Month=3D"2">February 15, 2003</st1:date>=
 </p>

</div>

<div style=3D'mso-element:footer' id=3Def1>

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<div style=3D'mso-element:frame;mso-element-wrap:around;mso-element-anchor-=
vertical:
paragraph;mso-element-anchor-horizontal:margin;mso-element-left:right;
mso-element-top:.05pt;mso-height-rule:exactly'>

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  <p class=3DMsoFooter style=3D'mso-element:frame;mso-element-wrap:around;
  mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:margi=
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-[if supportFields]><span
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  class=3DMsoPageNumber><span style=3D'mso-no-proof:yes'>6</span></span><!-=
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<p class=3DMsoFooter style=3D'margin-right:.25in'>Li-Yan Zhu &amp; Yun K. K=
i<st1:PersonName>m</st1:PersonName></p>

</div>

<div style=3D'mso-element:footer' id=3Dff1>

<p class=3DMsoFooter>Second Revision <st1:date Year=3D"2003" Day=3D"15" Mon=
th=3D"2">February
 15, 2003</st1:date></p>

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