Computing error lets people grab Bitcoin tokens for $0 on Japan’s Zaif exchange.
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Category: computing – Page 729
Although mobile devices such as tablets and smartphones let us communicate, work and access information wirelessly, their batteries must still be charged by plugging them in to an outlet. But engineers at the University of Washington have for the first time developed a method to safely charge a smartphone wirelessly using a laser.
As the team reports in a paper published online in December in the Proceedings of the Association for Computing Machinery on Interactive, Mobile, Wearable & Ubiquitous Technologies, a narrow, invisible beam from a laser emitter can deliver charge to a smartphone sitting across a room — and can potentially charge a smartphone as quickly as a standard USB cable. To accomplish this, the team mounted a thin power cell to the back of a smartphone, which charges the smartphone using power from the laser. In addition, the team custom-designed safety features — including a metal, flat-plate heatsink on the smartphone to dissipate excess heat from the laser, as well as a reflector-based mechanism to shut off the laser if a person tries to move in the charging beam’s path.
“Safety was our focus in designing this system,” said co-author Shyam Gollakota, an associate professor in the UW’s Paul G. Allen School of Computer Science & Engineering. “We have designed, constructed and tested this laser-based charging system with a rapid-response safety mechanism, which ensures that the laser emitter will terminate the charging beam before a person comes into the path of the laser.”
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Networks that harness entanglement and teleportation could enable leaps in security, computing and science.
- By Davide Castelvecchi, Nature magazine on February 16, 2018
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Try a quick experiment: Take two flashlights into a dark room and shine them so that their light beams cross. Notice anything peculiar? The rather anticlimactic answer is, probably not. That’s because the individual photons that make up light do not interact. Instead, they simply pass each other by, like indifferent spirits in the night.
But what if light particles could be made to interact, attracting and repelling each other like atoms in ordinary matter? One tantalizing, albeit sci-fi possibility: light sabers — beams of light that can pull and push on each other, making for dazzling, epic confrontations. Or, in a more likely scenario, two beams of light could meet and merge into one single, luminous stream.
It may seem like such optical behavior would require bending the rules of physics, but in fact, scientists at MIT, Harvard University, and elsewhere have now demonstrated that photons can indeed be made to interact — an accomplishment that could open a path toward using photons in quantum computing, if not in lightsabers.
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Quantum computing has taken a step forward with the development of a programmable quantum processor made with silicon.
The team used microwave energy to align two electron particles suspended in silicon, then used them to perform a set of test calculations.
By using silicon, the scientists hope that quantum computers will be more easy to control and manufacture.
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Science’s pirate queen
Posted in computing, law, neuroscience, open access, science
These campaigns could erode the base of the Legal Open Access movement: scientists’ awareness of their options for sharing research. Elbakyan, on the other hand, would be left unaffected. The legal campaigns against Sci-Hub have — through the Streisand effect — made the site more well-known than most mainstay repositories, and Elbakyan more famous than legal Open Access champions like Suber.
The threat posed by ACS’s injunction against Sci-Hub has increased support for the site from web activists organizations such as the EFF, which considesr the site “a symptom of a serious problem: people who can’t afford expensive journal subscriptions, and who don’t have institutional access to academic databases, are unable to use cutting-edge scientific research.”
In cramped quarters at Russia’s Higher School of Economics, shared by four students and a cat, sat a server with 13 hard drives. The server hosted Sci-Hub, a website with over 64 million academic papers available for free to anybody in the world. It was the reason that, one day in June 2015, Alexandra Elbakyan, the student and programmer with a futurist streak and a love for neuroscience blogs, opened her email to a message from the world’s largest publisher: “YOU HAVE BEEN SUED.”
It wasn’t long before an administrator at Library Genesis, another pirate repository named in the lawsuit, emailed her about the announcement. “I remember when the administrator at LibGen sent me this news and said something like ‘Well, that’s… that’s a real problem.’ There’s no literal translation,” Elbakyan tells me in Russian. “It’s basically ‘That’s an ass.’ But it doesn’t translate perfectly into English. It’s more like ‘That’s fucked up. We’re fucked.’”.
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