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<div class="moz-cite-prefix">Do histórico destas coisas ...<br>
<br>
Que não se esqueçam de usar antenas flexíveis (há por aí diversas
de portátil) e uns avisos vistosos para terem cuidado com elas e
não esquecerem ligar as baterias antes de o lançar em orbita ...<br>
<br>
73!<br>
<br>
On 22-06-2012 12:21, João Gonçalves Costa wrote:<br>
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<p class="MsoNormal"><span lang="EN-US">Students build
Supercapacitor battery for next ARISSat <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Penn State students have
built a state-of-the-art supercapacitor battery for the next
amateur radio ARISSat satellite.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">On Feb. 3, 2006,
astronauts tossed an old spacesuit off the International
Space Station. Inside was an amateur radio transmitter, a
temperature sensor and some batteries.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The suit was a DIY
satellite. It circled the Earth twice, repeating a greeting
recorded in multiple languages; ham radio operators listened
in as it passed overhead. </span>Then the batteries died.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-US">The Radio Amateur
Satellite Corporation, or AMSAT, tried again in 2011. The
battery in that satellite, a more traditional box design,
also failed.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">For the next model,
AMSAT, a volunteer group, turned to the School of
Engineering at Penn State Erie, The Behrend College. Three
students designed a brand-new battery: a 1.8 kg cube powered
by 15 supercapacitors, each roughly the size of a film
canister.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">The battery was built to
handle 16 charge cycles in a 24-hour period. That will power
the satellite in dark orbits, when the solar panels are not
facing the sun.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">To activate the battery
before those solar panels charge, the students – David
Jesberger, of St. Marys; Kathleen Nicholas, of Pittsburgh;
and Jacob Sherk, of Elizabethtown – added four 9-volt
Duracells.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">AMSAT hopes to fit the
satellite into a rocket payload and onto the International
Space Station sometime in 2013. The astronauts won’t have to
do much with it.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">“It’s simple by design.
They flip a switch, and they throw it out,” said Dakshina
Murthy Bellur, an assistant professor of electrical and
computer engineering at Penn State Behrend. He supervised
the battery work, which counted as the students’ senior
capstone project.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">All three students have
since graduated. All three have jobs: Nicholas and Jesberger
signed on with defense contractors, and Sherk works at the
Three Mile Island nuclear power plant.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">They continue to track
the AMSAT project. They want to know when their battery,
upon which they laser-etched with their names and a Nittany
Lion paw print, gets a launch date.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">“That’s going to be
cool,” Jesberger said. “We’ll have our signatures in space.”<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">Source Pennsylvania
State University <a class="moz-txt-link-freetext" href="http://live.psu.edu/story/60125">http://live.psu.edu/story/60125</a><o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal">ARISSat <a moz-do-not-send="true"
href="http://www.arissat.org/">http://www.arissat.org/</a> <o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<br>
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