Sciences & Technology
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Veille sur les évolutions des sciences et des technologies
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New type of graphene-based transistor will increase the clock speed of processors

New type of graphene-based transistor will increase the clock speed of processors | Sciences & Technology | Scoop.it

"Scientists have developed a new type of graphene-based transistor and modeling demonstrates that it has ultralow power consumption compared with other similar transistor devices. The findings have been published in a paper in the journal Scientific Reports. The most important effect of reducing power consumption is that it enables increased processor clock speeds—according to calculations, as much as two orders of magnitude higher..."

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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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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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Nobel Prize For Physics 2013

Nobel Prize For Physics 2013 | Sciences & Technology | Scoop.it
Francois Englert and Peter W. Higgs won the 2013 Nobel Prize For Physics on Tuesday for their research into the Higgs boson particle, nicknamed the "God particle."
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Un transistor high-K en oxyde de germanium et titane

Un transistor high-K en oxyde de germanium et titane | Sciences & Technology | Scoop.it
Des chercheurs du laboratoire national Brookhaven ont mesuré les performances d’un transistor en oxyde de germanium et titane utilisant une couche isolante high-K en dioxyde de hafnium, selon Phys.org.
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La masse se mesure aussi en secondes

La masse se mesure aussi en secondes | Sciences & Technology | Scoop.it
C'est une magnifique et profonde expérience de physique que publie Science dans son numéro du 1er février.

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New two-dimensional semiconductor has ideal band gap for solar harvesting

New two-dimensional semiconductor has ideal band gap for solar harvesting | Sciences & Technology | Scoop.it
(Phys.org)—At its heart, photovoltaics research is about finding materials with specific properties that make them good at absorbing sunlight and converting it into electricity.

 

Read more, very interesting...:

http://phys.org/news/2012-11-two-dimensional-semiconductor-ideal-band-gap.html

 


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[VIDEO] - The Most Astounding Fact (Neil DeGrasse Tyson)

Astrophysicist Dr. Neil DeGrasse Tyson was asked by a reader of TIME magazine, "What is the most astounding fact you can share with us about the Universe?" This is his answer.


Via Sakis Koukouvis
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Vonny~'s comment, April 1, 2012 10:31 AM
Thank you .. this is wonderful!!!!
Sakis Koukouvis's comment, April 1, 2012 10:33 AM
Yes, it is wonderful!
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Transparent, flexible supercapacitors pave the way for a multitude of applications

Transparent, flexible supercapacitors pave the way for a multitude of applications | Sciences & Technology | Scoop.it
"The standard appearance of today's electronic devices as solid, black objects could one day change completely as researchers make electronic components that are transparent and flexible. Working toward this goal, researchers in a new study have developed transparent, flexible supercapacitors made of carbon nanotube films. The high-performance devices could one day be used to store energy for everything from wearable electronics to photovoltaics..."
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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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Le borophène devient un possible concurrent du graphène

Le borophène devient un possible concurrent du graphène | Sciences & Technology | Scoop.it

"Des chercheurs de l’université Brown aux États-Unis viennent de démontrer qu’une feuille d’une épaisseur d'un atome de bore était possible. Leurs résultats ont été publiés dans la revue Nature Communications. Concrètement, ils ont réussi à arranger 36 atomes de bore ensemble, montrant que les modèles théoriques établis par la communauté scientifique avant leur expérience étaient corrects. Ce n’est pas un borophène, mais on s’y approche..."

 

English article : http://www.nature.com/ncomms/2014/140120/ncomms4113/full/ncomms4113.html

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Changes Approved For 19 Chemical Elements

Changes Approved For 19 Chemical Elements | Sciences & Technology | Scoop.it
Nineteen elements on the periodic table — including gold, cadmium, arsenic and aluminum — are getting their atomic weights adjusted.
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Quantum Tricks Drive Magnetic Switching into the Fast Lane | News | Scientific Computing

Quantum Tricks Drive Magnetic Switching into the Fast Lane | News | Scientific Computing | Sciences & Technology | Scoop.it
Researchers at the U.S. Department of Energy's Ames Laboratory, Iowa State University, and the University of Crete in Greece have found a new way to switch magnetism that is at least 1000 times faster than currently used in magnetic memory...
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Happy Birthday! The Transistor Turns 65 This Week

Happy Birthday! The Transistor Turns 65 This Week | Sciences & Technology | Scoop.it
This one invention at Bell Labs changed everything about our world -- and in some ways was the biggest thing that happened in the entire 20th century.
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Tableau périodique des éléments illustré

Tableau périodique des éléments illustré | Sciences & Technology | Scoop.it
Periodic Table of the Elements, in Pictures...

 

La table de Mendeleïev illustrée, et quelques autres illustrations pour la physique. C'est bien réalisé ; il ne manque que la même chose en Français...

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