A single layer of tin atoms could be the world's first material to conduct electricity with 100 percent efficiency at the temperatures that computer chips operate, according to a team of theoretical physicists led by researchers from the U.S.
Déjà annoncé comme un chef-d'oeuvre, le film d’Alfonso Cuaron, Gravity, sort ce mercredi dans les salles. Il retrace l’histoire de deux astronautes américains menacés par un nuage de débris spatiaux. L’occasion de revenir sur un sujet polémique.
A pair of breakthroughs in the field of silicon photonics by researchers at the University of Colorado Boulder, the Massachusetts Institute of Technology and Micron Technology Inc. could allow for the trajectory of exponential improvement in microprocessors that began nearly half a century ago—known as Moore's Law—to continue well into the future, allowing for increasingly faster electronics, from supercomputers to laptops to smartphones.
The research team, led by CU-Boulder researcher Milos Popovic, an assistant professor of electrical, computer and energy engineering, developed a new technique that allows microprocessors to use light, instead of electrical wires, to communicate with transistors on a single chip, a system that could lead to extremely energy-efficient computing and a continued skyrocketing of computing speed into the future.
Popovic and his colleagues created two different optical modulators—structures that detect electrical signals and translate them into optical waves—that can be fabricated within the same processes already used in industry to create today's state-of-the-art electronic microprocessors. The modulators are described in a recent issue of the journal Optics Letters.
First laid out in 1965, Moore's Law predicted that the size of the transistors used in microprocessors could be shrunk by half about every two years for the same production cost, allowing twice as many transistors to be placed on the same-sized silicon chip. The net effect would be a doubling of computing speed every couple of years.
The projection has held true until relatively recently. While transistors continue to get smaller, halving their size today no longer leads to a doubling of computing speed. That's because the limiting factor in microelectronics is now the power that's needed to keep the microprocessors running. The vast amount of electricity required to flip on and off tiny, densely packed transistors causes excessive heat buildup.
"The transistors will keep shrinking and they'll be able to continue giving you more and more computing performance," Popovic said. "But in order to be able to actually take advantage of that you need to enable energy-efficient communication links."
Could the famed 'Big Bang' theory need a revision? A group of theoretical physicists suppose the birth of the universe could have happened after a four-dimensional star collapsed into a black hole and ejected debris.
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With oil supplies around the world fast depleting, researchers around the world have been trying to find an alternative that could sustain the energy needs of mankind. A team at Israel’s Ben Gurion University may have come up with an alternative fuel, made from water and carbon dioxide.
Unlike other fuel alternatives available today, the “green feed” created at BGU has a significant advantage: it can be turned into fuel using existing oil refining methods and delivered to gas stations using existing infrastructure. Professor Moti Hershkowitz, who led the research team, predicts that this breakthrough technology should be commercially viable within 10 years.
“It is an extraordinary challenge to convert carbon dioxide and hydrogen to green feed,” says Herskowitz, “The technology is based on novel specially tailored catalysts and catalytic processes.” Hershkowitz explains that until the process is fully implemented, it will be possible to use the green fuel mixed with other available forms of green fuel.
The process is patent pending, “and we are ready to take off,” demonstrate and commercialize it, asserts Herskowitz. Bench experiments have been conducted and scale-up should be relatively simple, he says. Herskowitz believes that, “As technological breakthroughs, such as carbon dioxide capture from various sources including air and water splitting, become technologically and economically feasible, this process will become the dominant technology for production of liquid fuels.”
Les croyances sont générées par la machine à croire sans soucis automatique de la vérité. L'intérêt pour ce qui est vrai est une "organisation" supérieure de l'orientation cognitive acquise qui reflète une philosophie sous-jacente présupposant une réalité objective pas toujours perçue par nos sens.
Silicon Valley : à San Francisco, les drones de Skycatch font rêver ... La Tribune.fr Une vingtaine de toutes jeunes pousses y partagent aussi un étage, aux frais du business angel Allen Morgan qui se décrit comme un « sherpa de startups.
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