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Sciences & Technology
Veille sur les évolutions des sciences et des technologies
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Perovskites provide big boost to silicon solar cells

Perovskites provide big boost to silicon solar cells | Sciences & Technology | Scoop.it
Stacking perovskites onto a conventional silicon solar cell dramatically improves the overall efficiency of the cell, according to a new study led by Stanford University scientists.
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Zinc oxide materials tapped for tiny energy harvesting devices

Zinc oxide materials tapped for tiny energy harvesting devices | Sciences & Technology | Scoop.it

"Today, we're surrounded by a variety of electronic devices that are moving increasingly closer to us - we can attach and wear them, or even implant electronics inside our bodies.

 

Many types of smart devices are readily available and convenient to use. The goal now is to make wearable electronics that are flexible, sustainable and powered by ambient renewable energy.

This last goal inspired a group of Korea Advanced Institute of Science and Technology (KAIST) researchers to explore how the attractive physical features of zinc oxide (ZnO) materials could be more effectively used to tap into abundant mechanical energy sources to power micro devices. They discovered that inserting aluminum nitride insulating layers into ZnO-based energy harvesting devices led to a significant improvement of the devices' performance. The researchers report their findings in the journal Applied Physics Letters..."

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The future is bright, the future is quantum dot televisions

The future is bright, the future is quantum dot televisions | Sciences & Technology | Scoop.it

 

The Consumer Electronics Show (CES) has arrived again, the world's largest consumer electronics and technology exhibition in Las Vegas, where manufacturers will show off the new technologies available in 2015 (...)

Korean electronics and display manufacturer LG has set the ball rolling by announcing its 4K ultra high-definition television displays (UHDTVs) that use quantum dot technology, an improved method for producing colour displays.

What exactly is a quantum dot?


Read more at: http://phys.org/news/2015-01-future-bright-quantum-dot-televisions.html#jCp

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Texas Instruments builds an alternative energy for the Internet of Things

Texas Instruments builds an alternative energy for the Internet of Things | Sciences & Technology | Scoop.it
The Internet of Things is nothing without batteries and plugs. But it's possible to build a sensor network that uses harvested energy that comes from changes in temperature, vibrations, wind and light, as Texas Instruments will demonstrate at the Consumer Electronics Show in January.
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An Infographic In Celebration of Computer Science Education Week

An Infographic In Celebration of Computer Science Education Week | Sciences & Technology | Scoop.it
It’s easy to take digital technology for granted these days. To students who were practically born with an iPad in their hands, it’s hard to imagine a time when a world of history and knowledge wasn’t just a few swipes away.
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Des rayons cosmiques plus riches que prévu

Des rayons cosmiques plus riches que prévu | Sciences & Technology | Scoop.it
Après plusieurs décennies d'études, les chercheurs se demandent encore de quoi sont fait les rayons cosmiques ultra-énergétiques, en provenance des confins de la Galaxie.
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Pour une éthique de la recherche en robotique

Pour une éthique de la recherche en robotique | Sciences & Technology | Scoop.it

"À l’occasion de la remise d’un rapport préconisant l’adoption de règles éthiques encadrant la recherche et la production robotiques, Raja Chatila, directeur de l’Institut des systèmes intelligents et de robotique, précise la nature et l’intérêt de telles règles..."

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La batterie du futur sera produite dans les Pyrénées

La batterie du futur sera produite dans les Pyrénées | Sciences & Technology | Scoop.it
Le géant canadien de l'énergie Hydro-Québec va développer dans son futur laboratoire de recherche de Lacq (Pyrénées-Atlantiques), une technologie révolutionnaire permettant de produire d'ici à 2020 la batterie du futur.
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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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Laser pulses used to track motion of electrons in metals with attosecond precision

Laser pulses used to track motion of electrons in metals with attosecond precision | Sciences & Technology | Scoop.it

"It is easy to measure electric current. But it is extremely hard to watch the individual electrons which make up this current. Electrons race through the metal with a speed of several million meters per second, and the distance they have to cover between two adjacent atoms is very small. This means that tiny time intervals have to be resolved in order to watch the electrons dashing through the metal.

 

Measurements in Garching (Germany) and theoretical calculations at the Vienna University of Technology (Austria) have now made this possible. As it turns out, the motion of the electrons in the metal is remarkably similar to ballistic motion in free space. The results have now been published in the journal Nature..."

 

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Honda FCV Concept fuel-cell vehicle makes debut in Detroit

Honda FCV Concept fuel-cell vehicle makes debut in Detroit | Sciences & Technology | Scoop.it
Honda has taken full opportunity of the timing of the 2015 North American International Auto Show in Detroit this month to announce up and coming launches.
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How did we find the distance to the sun?

How did we find the distance to the sun? | Sciences & Technology | Scoop.it
How far is the Sun? It seems as if one could hardly ask a more straightforward question. Yet this very inquiry bedeviled astronomers for more than two thousand years.
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Thermoelectric power plants could offer economically competitive renewable energy

Thermoelectric power plants could offer economically competitive renewable energy | Sciences & Technology | Scoop.it
(Phys.org)—A new study predicts that large-scale power plants based on thermoelectric effects, such as small temperature differences in ocean water, could generate electricity at a lower cost than photovoltaic power plants.
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Research team announces new class of compounds that appear to be effective against malaria

Research team announces new class of compounds that appear to be effective against malaria | Sciences & Technology | Scoop.it
(Phys.org) —A large team of researchers with members from around the globe has announced that a class of compounds they've been studying (pyrazoleamides) appears to be successful in fighting malaria.
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The Easiest Raspberry Pi Media Centre, With RasPlex

The Easiest Raspberry Pi Media Centre, With RasPlex | Sciences & Technology | Scoop.it
The Raspberry Pi is a surprisingly capable little computer. In the past, we've show you how to make a Raspberry Pi home theatre with Rasbmc. Since we published that guide, an easier to use and better performing operating system has been released. Today I'm going to show you how with RasPlex; it's the easiest way…
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Toyota lance "Mirai", véhicule du futur roulant à l'hydrogène

Toyota lance "Mirai", véhicule du futur roulant à l'hydrogène | Sciences & Technology | Scoop.it
Le constructeur nippon Toyota, pionnier des véhicules hybrides, a franchi mardi une nouvelle étape en présentant une berline fonctionnant à l'hydrogène, premier modèle de ce type commercialisé à grande échelle dans le monde, même si ses objectifs restent modestes.
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Un nouveau type de batterie lithium-soufre

Un nouveau type de batterie lithium-soufre | Sciences & Technology | Scoop.it
Des chercheurs de General Motors dirigés par Xingcheng Xiao déclarent avoir surmonté les obstacles menant à la conception d'une batterie lithium-soufre (Li-S), un modèle de batterie rechargeable qui a le potentiel de laisser la technologie...
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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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