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quinta-feira, 22 de julho de 2010

Instructables e Notícias

Um projecto Fm com o Arduino:


http://www.instructables.com/id/Arduino-FM-radio-receiver-shield/

E para algo completamente diferente, cultivar Cogumelos com borra de café e copos de plástico:


http://www.instructables.com/id/Gourmet-mushrooms-in-an-old-coffee-cup/


Mais uma notícia de Astronomia, uma estrela realmente grande:

Scientists Discover Most Massive Star

Published July 21, 2010


LONDON -- A huge ball of brightly burning gas drifting through a neighboring galaxy may be the heaviest star ever discovered -- hundreds of times more massive than the sun, scientists said Wednesday after working out its weight for the first time.

Those behind the find say the star, called R136a1, may once have weighed as much as 320 solar masses. Astrophysicist Paul Crowther said the obese star -- twice as heavy as any previously discovered -- has already slimmed down considerably over its lifetime.

In fact, it's burning itself off with such intensity that it shines at nearly 10 million times the luminosity of the sun.
"Unlike humans, these stars are born heavy and lose weight as they age," said Crowther, an astrophysicist at the University of Sheffield in northern England. "R136a1 is already middle-aged and has undergone an intense weight loss program."


Baterias melhores e mais seguras para os Automóveis:

Safer, Longer-Lasting Batteries for Cars

A startup company has a printing method for solid-state batteries.

By Katherine Bourzac

An Orlando startup has developed new manufacturing techniques that could improve the stability and lifetime of batteries used in electric vehicles. Planar Energy, a spin-off of the National Renewable Energy Laboratories (NREL), is working on scaling up solid-state lithium-ion batteries.
Conventional batteries, which typically use a liquid electrolyte, can suffer from undesirable chemical reactions that damage the battery's cathode. Replacing the liquid electrolyte with a solid ion conductor can improve battery stability and lifetime, and also allow a battery to be smaller because additional components aren't needed to maintain stability. Solid electrolytes are also compatible with a wider range of battery chemistries that could potentially offer higher power or storage density.

But solid-state batteries are expensive to make and have been difficult to scale up to the size needed for laptops or vehicles. Like other solid-state devices, solid-state batteries are normally made using complex, costly, vacuum-based deposition methods. The vacuum deposition limits the thickness of solid-state batteries, which, in turn, limits their energy storage capacity. So these thin-film batteries have been limited to use in small devices.

http://www.technologyreview.com/energy/25825/

E Micro-cápsulas que comunicam como as Células!

Synthetic Cell-Like Microcapsules Communicate Like Biological Cells, Cooperate Like Ants
By Clay Dillow Posted 07.20.2010 at 5:02 pm

Taking cues from slime molds, ants, and living biological cells, a team of University of Pittsburgh researchers has designed a system of artificial cells that can communicate with one another and cooperate to carry out tasks. The computer models they've devised could lead to artificial cellular systems that perform highly specialized jobs at the microscopic level.
The artificial cells are more like microcapsules that can move independently and deposit cargo wherever it's needed. But directing these microcapsules -- or more accurately, getting them to direct themselves -- is the real breakthrough.

http://www.popsci.com/science/article/2010-07/synthetic-cell-microcapsules-communicate-biological-cells-cooperate-ants

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