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Until Tomorrow,
Erin
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New ESA satellite starts operations
The European Space Agency says its GIOVE-B satellite
transmitted its first navigation signals Wednesday. ESA
scientists called the event a "truly historic step for
satellite navigation since GIOVE-B (Galileo in Orbit Validation
Element) is now, for the first time, transmitting the GPS-
Galileo common signal using a specific optimized waveform,
MBOC (multiplexed binary offset carrier)." That waveform was
approved in an agreement signed by the European Union and the
United States for their respective systems, Galileo and the
future GPS-III. The 1,100-pound satellite that was launched
April 27 is continuing testing for Europe's planned $5.3 billion
global positioning system that is to become operational in 2013.
"Now with GIOVE-B broadcasting its highly accurate signal in
space we have a true representation of what Galileo will offer
to provide the most advanced satellite positioning services,
while ensuring compatibility and interoperability with GPS,"
said Galileo Project Manager Javier Benedicto.
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MIT building low-cost solar concentrator
A team of Massachusetts Institute of Technology students is
building a prototype power concentrator with a goal of
revolutionizing the solar energy field. Led by MIT mechanical
engineering graduate student Spencer Ahrens, the team is
assembling a 12-foot-square mirrored dish capable of concentrating
sunlight by a factor of 1,000. But it's being built from simple,
inexpensive industrial materials selected for price, durability
and ease of assembly rather than for optimum performance. Ahrens
said the goal is to make a dish that, in mass production, can be
competitive in cost with other energy sources and produce heat
for space heating and electric power at the same time. "The
technical challenge here is to make it simple," Ahrens said.
"We're using all commodity materials that are all in high
production." Ahrens said the dish, in the Sun Belt, could make
about 10,000 peak watts of heat and 3,500 peak watts of electricity.
"It's designed for long life -- we hope they will last more than
30 years with good maintenance -- and for indigenous manufacturing
in the developing world with minimal tooling," he said.
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Platypus genome provides evolution insight
U.S. and British researchers say an analysis of platypus DNA
holds potential for advances in human disease prevention.
Researchers said they now have a better understanding of mammalian
evolution. "With adaptations like webbed feet to fit its aquatic
lifestyle and the poison spurs that decorate males, the platypus
represents for many a patchwork of evolutionary development,"
Louisiana State University officials said Wednesday in a news
release. "Their genomic organization was strange and a little
unexpected," LSU biologist Mark Batzer said in a statement. "It
appeared much more bird- and reptile-like than mammalian, even
though it is indeed classified as a mammal." Batzer said the
research provides insight into mammalian gene regulation and
immune systems.
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