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Hubert Reeves ausculte la crise écologique en sondant l'univers et l'humanité

Hubert Reeves ausculte la crise écologique en sondant l'univers et l'humanité | Sciences & Technology | Scoop.it
Le célèbre astrophysicien vient de sortir un nouvel ouvrage pour tenter de réconcilier la belle histoire du cosmos avec la moins belle histoire d'Homo sapiens...

Via Hubert MESSMER @Zehub on Twitter, Dominique VOLPE
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Copper iodide phosphors could mean less-expensive and toxic LEDs | Ben Coxworth | GizMag.com

Copper iodide phosphors could mean less-expensive and toxic LEDs | Ben Coxworth | GizMag.com | Sciences & Technology | Scoop.it

Everybody loves LEDs, as they're far more efficient and longer-lasting than traditional incandescent bulbs. They're also more economical to use in the long run, although they're costlier on a per-bulb basis. That price gap could soon be closing, however, as scientists have discovered a cheaper alternative to one of their most expensive ingredients.

White light-emitting LEDs use metals known as rare earth elements (REEs) for their phosphors – these are the materials that convert the light emitted from LED chips into longer wavelengths, allowing the bulbs to put out full-spectrum visible light.

The mining and processing of REEs is hazardous, however, leaving China as just about the only country currently supplying them in substantial quantities. This drives up their price, which could climb even higher as demand for LED-based technologies increases.

Led by Prof. Jing Li, a team of scientists from New Jersey's Rutgers University has now discovered that a family of materials made from relatively cheap and abundant copper iodide can be substituted for REEs.


Via Chuck Sherwood, Senior Associate, TeleDimensions, Inc
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Nvidia's Maxwell graphics chips for laptops can beat some powerful gaming desktops

Nvidia's Maxwell graphics chips for laptops can beat some powerful gaming desktops | Sciences & Technology | Scoop.it
With Maxwell, laptop graphics will be 80% as speedy as desktop graphics.

 

"Computer gaming is about to take a big leap forward. Nvidia is launching its next-generation graphics chips for laptops today that the company claims are at about 75 percent of the performance of the fastest desktop graphics processing units (GPU)s..."

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Une petite histoire du nucléaire: Stagg Field, 1942 [1/2]

Une petite histoire du nucléaire: Stagg Field, 1942 [1/2] | Sciences & Technology | Scoop.it
1942, sous les gradins du stade de Stagg Field, dans la banlieue de Chicago. Le premier réacteur nucléaire de l'Histoire va démarrer sous la houlette du physicien italien Enrico Fermi.
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MIT's improved all-liquid battery could make renewable energy more competitive | Nick Lavars | GizMag.com

MIT's improved all-liquid battery could make renewable energy more competitive | Nick Lavars | GizMag.com | Sciences & Technology | Scoop.it

Our ability to store energy has proven a big hurdle in the adoption of renewable energies. But now a team of researchers from MIT have developed a new all-liquid battery system that extends the life of such devices while also costing less to make, a development they say could make wind and solar energy more competitive with traditional sources of power.

Donald Sadoway, a professor of Materials Chemistry at MIT, has been exploring the potential of electrical-grid-scale liquid batteries for some time. These batteries comprise layers of molten material, the varying densities of which cause the layers to separate naturally, much like oil and water.

With magnesium used for one electrode, antimony for another and molten salt serving as the electrolyte, these systems needs to be heated to 700° C (1,292° F) to operate. But the researchers found that exchanging some of the materials, using one electrode made from lithium and another from a combination of lead and antimony, reduces the operating temperature to 450-500° C (842-932° F).

What truly surprised the researchers was the benefits of both the antimony and lead when mixed together to create the electrode. They had anticipated that the higher voltage of the antimony would be compromised by the lead, and the lead's lower melting point would be compromised by the addition of the antimony. Rather, they found that, while the combined melting point lay in between that of the individual materials, the hybrid metal retained the higher voltage of the antimony.

"We hoped (the characteristics of the two metals) would be nonlinear,” Sadoway says. “They proved to be (nonlinear), but beyond our imagination. There was no decline in the voltage. That was a stunner for us.”

 

Click headline to read more--


Via Chuck Sherwood, Senior Associate, TeleDimensions, Inc
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Sciences pour Tous, site d'information scientifique

Sciences pour Tous, site d'information scientifique | Sciences & Technology | Scoop.it

Le magazine en ligne Sciences pour Tous ouvre un espace de rencontre avec ceux qui font la science à l’Université : publications scientifiques, portraits de chercheurs, reportages photo et articles "grand angle" pour faire dialoguer sciences et société.


Via Audrey Bardon, michel verstrepen
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Sharp to mass-produce low-power mobile displays in 2017

"Sharp has set 2017 as its target for mass production of a new display it says will reduce power consumption in smartphones and tablets.

 

The MEMS-IGZO display, being developed under a 2012 tie-up with Qualcomm subsidiary Pixtronix, could be used in smartphones and tablets as well as larger displays.

 

Compared to current LCDs, MEMS-IGZO technology can operate without blurring the image in temperatures down to minus 30 C, offers better color purity and gamut, and has ultra-low power consumption (...)"

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Germanene: a novel two-dimensional germanium allotrope akin to graphene and silicene - IOPscience

Germanene: a novel two-dimensional germanium allotrope akin to graphene and silicene - IOPscience | Sciences & Technology | Scoop.it

"We have grown an atom-thin, ordered, two-dimensional multi-phase film in situ through germanium molecular beam epitaxy using a gold (111) surface as a substrate. (...)

 

After the successful synthesis of silicene in 2012, which was followed by a surge of studies on elemental, novel two-dimensional (2D) materials beyond graphene, a daunting quest was to obtain germanene, the germanium-based analogue of graphene, already predicted to possibly exist in 2009. Although its fully hydrogenated form, germanane, was fabricated using a wet chemistry method in 2013, germanene has remained elusive. Here we show compelling experimental and theoretical evidence of its synthesis by dry epitaxial growth on a gold (111) surface. (...)"

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Wolfram + Raspberry Pi Project: A Wolfram Engine on Every Raspberry Pi

Wolfram + Raspberry Pi Project: A Wolfram Engine on Every Raspberry Pi | Sciences & Technology | Scoop.it
A pilot release of the Wolfram Language and Mathematica is now available for every Raspberry Pi computer.

 

Learn more:

 

http://gustmees.wordpress.com/2014/08/24/coding-a-new-trend-in-education-and-a-big-responsibility/

 


Via Gust MEES
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Gust MEES's curator insight, September 6, 4:34 PM
A pilot release of the Wolfram Language and Mathematica is now available for every Raspberry Pi computer.


Learn more:


http://gustmees.wordpress.com/2014/08/24/coding-a-new-trend-in-education-and-a-big-responsibility/


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Highly conductive organic metal looks promising for disposable electronic devices

Highly conductive organic metal looks promising for disposable electronic devices | Sciences & Technology | Scoop.it

"(Phys.org) —Although organic materials are often used as semiconductors, such as in organic LEDs and organic transistors, organic materials that have an electrical conductivity as high as that of metals are still very scarce. One problem with developing organic metals is that there is a tradeoff in terms of their crystalline structure: a high crystallinity is required for high conductivity, but is detrimental to the materials' processability. (...)"

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Overview | Introducing the Raspberry Pi Model B+ | Adafruit Learning System

Overview | Introducing the Raspberry Pi Model B+ | Adafruit Learning System | Sciences & Technology | Scoop.it

"Yep, that's right, the fantastic engineers at Raspberry Pi HQ have blessed us with a new design. They've taken all the feedback over the last 3 years and rolled out a nice updated Pi with many fixes and extras...all at the same price! (...)"

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Faut-il craquer pour l'audio HD ? - Quel avantage par rapport au MP3 ?

Faut-il craquer pour l'audio HD ?  - Quel avantage par rapport au MP3 ? | Sciences & Technology | Scoop.it
Flac, Blu-Ray Pure Audio, lossless, 16 ou 24 bits, la rédaction de Tom's Guide vous explique tout sur le son sans perte et l'audio HD.
Terheck's insight:

Si vous aimez la musique et vous posez encore la question de l'intérêt des formats sans perte type FLAC par rapport au MP3, cette article devrait vous convaincre.

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How To Host A Website With Raspberry Pi

How To Host A Website With Raspberry Pi | Sciences & Technology | Scoop.it

"Running your own Web server is the ultimate mark of online independence—and it only need cost you $35.

 

Never underestimate the miniscule, $35 Raspberry Pi. Although it’s marketed as an experimental machine aimed at helping you learn to code, there’s nothing entry-level about its capabilities. 

In a pinch, you can even use your Raspberry Pi as a Web server. You can host a simple site or store files in the cloud so you can access them at any time—no monthly hosting fees, limited templates, or other barriers to your creativity (...)"

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NASA’s tiny 460GHz vacuum transistor that could one day replace silicon FETs | Nano Technology

NASA’s tiny 460GHz vacuum transistor that could one day replace silicon FETs | Nano Technology | Sciences & Technology | Scoop.it
Way back in the salad days of digital computing (the 1940s and '50s), computers were made of vacuum tubes -- big, hot, clunky devices that, when you got right down to it, were essentially glorified light bulbs. This is why early computers like the ENIAC weighed more than 27 tons and consumed more power than a small town. Later, obviously, vacuum tubes would be replaced by probably the greatest invention of all time -- the solid-state transistor -- which would allow for the creation of smaller, faster, cheaper, and more reliable computers. Fast forward to 2014, though, and the humble CMOS field-effect transistor (FET) is starting to show its age. We've pretty much hit the limit on shrinking silicon transistors any further, and they can't operate at speeds much faster than a few gigahertz. Which is why NASA's Ames Research Center is going back to the future with its new vacuum transistor -- a nanometer-scale vacuum tube that, in early testing, has reached speeds of up to 460GHz.

Via Gust MEES
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Diane Johnson's curator insight, June 25, 12:13 PM

Great engineering connections!

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Samsung reveals five-times faster Wi-Fi

Samsung reveals five-times faster Wi-Fi | Sciences & Technology | Scoop.it
Samsung has revealed new technology making Wi-Fi speeds five-times faster for devices than the current norm
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Post-4K OLED TV: Where does picture quality go from here? - CNET

Post-4K OLED TV: Where does picture quality go from here? - CNET | Sciences & Technology | Scoop.it
Now that there are 4K OLED televisions, can picture quality get any better? Have we achieved perfection? If so, where do we go from here? Here's a list of next steps.
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ARM aims to put real brains into devices for the Internet of things

ARM aims to put real brains into devices for the Internet of things | Sciences & Technology | Scoop.it

"ARM wants to supercharge dumb appliances with better processors to build the Internet of things.

 

ARM has shipped more than 8 billion of its Cortex-M chips to date. But that may look small compared to the number of chips that it could ship for the Internet of things, or everyday objects that have both computing and connectivity. (...)"

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Twitter : une passerelle entre les physiciens et le grand public

Twitter : une passerelle entre les physiciens et le grand public | Sciences & Technology | Scoop.it
Les physiciens se mettent à gazouiller ! En effet, ils sont de plus en plus nombreux à partager quotidiennement leur passion et les résultats de leurs recherches sur Twitter. Le célèbre oiseau est-il en passe de changer le monde de la vulgarisation scientifique ?

Via Audrey Bardon
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Hy-Cycle, le vélo qui carbure à l’hydrogène

Hy-Cycle, le vélo qui carbure à l’hydrogène | Sciences & Technology | Scoop.it
Hy-Cycle est un vélo innovant qui se distingue par son système de propulsion. Mis au point par des ingénieurs australiens, il carbure à l’hydrogène. Présenté comme une solution de mobilité urbaine, il constitue un moyen simple et écolo de se déplacer.
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How Intel's Edison Stacks Up Against Arduino And Raspberry Pi

How Intel's Edison Stacks Up Against Arduino And Raspberry Pi | Sciences & Technology | Scoop.it

"At long last, Intel has shipped its shipped its tiny Edison computer. Announced in January, this $50 module—which Intel insists on calling a "development platform"—is ready for your latest maker projects.


Intel has hinted at big plans for Edison; it clearly hopes to seed the device, or something like it, so widely that it might end up a standard for the still-emerging Internet of Things. For now, however, Intel is positioning Edison as a DIY device for makers and hobbyists, promising to "lower the barriers to entry for entrepreneurs of all sizes" by including specs for makers and a forum for showing off Edison-based projects. Indeed, the only places Edison is available for sale so far are hobby sites. (...)"

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Flying Robot Rockstars

"KMel Robotics presents a team of flying robots that have taken up new instruments to play some fresh songs. The hexrotors create music in ways never seen before, like playing a custom single string guitar hooked up to an electric guitar amp. Drums are hit using a deconstructed piano action. And there are bells. Lots of bells."

Terheck's insight:

Have you ever seen drones playing music? No?

check it out then!

 

More to see on http://kmelrobotics.com

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Microsoft vs Google – Who leads the artificial intelligence race?

Microsoft vs Google – Who leads the artificial intelligence race? | Sciences & Technology | Scoop.it

"AI is back. For the first time since the 1980's, artificial intelligence researchers are making tangible progress on hard problems, and people are starting to talk seriously about strong AI again.  In the mean time, our increasingly data-driven world has kicked off an arms race between companies  ..."


Via Leona Ungerer, juandoming
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Healable Supramolecular Polymers as Organic Metals - Journal of the American Chemical Society (ACS Publications)

Healable Supramolecular Polymers as Organic Metals - Journal of the American Chemical Society (ACS Publications) | Sciences & Technology | Scoop.it

"Organic materials exhibiting metallic behavior are promising for numerous applications ranging from printed nanocircuits to large area electronics. However, the optimization of electronic conduction in organic metals such as charge-transfer salts or doped conjugated polymers requires high crystallinity, which is detrimental to their processability. To overcome this problem, the combination of the electronic properties of metal-like materials with the mechanical properties of soft self-assembled systems is attractive but necessitates the absence of structural defects in a regular lattice (...)"

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Discover the Poppy Project, an Open-source humanoid platform

Discover the Poppy Project, an Open-source humanoid platform | Sciences & Technology | Scoop.it

The Poppy project aims at building an Open-source humanoid platform based on robust, flexible, easy-to-usehardware and software.
Designed by the Flowers Lab at Inria Bordeaux and Ensta ParisTech (France), its development aims at providing an affordable and hackable humanoid robot for science, education, art and geeks.


Via Jean-Philippe BOCQUENET
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These Mad Scientists Want to Replace Solar Panels With Potted Plants

These Mad Scientists Want to Replace Solar Panels With Potted Plants | Sciences & Technology | Scoop.it
Designer Fabienne Felder teamed up with Cambridge scientists to explore solar cells that use moss to generate electricity.

 

"Designer Fabienne Felder wants to reupholster jumbo jets with moss. In her vision, passengers will sit on verdant tufts while the bryophytes purify the air and use electrons captured during photosynthesis to power the Direct TV panels on the seat backs. Many would think Felder was crazy, but biochemist Dr. Paolo Bombelli and plant scientist Ross Dennis from the University of Cambridge were impressed with her brio and offered her the opportunity to collaborate (...)"

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Electrostatics do the trick: Simple model describes what happens between organic semiconductors and metals

Electrostatics do the trick: Simple model describes what happens between organic semiconductors and metals | Sciences & Technology | Scoop.it
Organic semiconductors allow for flexible displays, solar cells, and other applications. One common problem in these devices, however, is the interface between the metallic contacts and the organic semiconductor material, where undesirable losses occur. Now researchers have shown what these losses depend upon.

 

From :

Helmholtz-Zentrum Berlin für Materialien und Energie. "Electrostatics do the trick: Simple model describes what happens between organic semiconductors and metals." ScienceDaily. ScienceDaily, 23 June 2014. <www.sciencedaily.com/releases/2014/06/140623104257.htm>.

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