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Thijs Versloot

Minimagnetospheres - towards magnetic deflector shields - 1 views

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    The study gave insight that already weak magnetic fields can deflect energetic particles due to charge separation and the formation of strong electric fields
Beniamino Abis

Spider Silk Grabs Electrically Charged Insects in Midair - 1 views

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    Certain strands of spider silk are attracted to statically charged objects, according to a new study, enhancing an arachnid's ability to catch prey.
jcunha

Superfast light source made from artificial atom - 0 views

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    A new more efficient type of single photon light source consisting of a quantum dot reproduces 1954 Robert Dicke theoretical proposal. Applications in quantum communications directly on the target. "All light sources work by absorbing energy - for example, from an electric current - and emit energy as light. But the energy can also be lost as heat and it is therefore important that the light sources emit the light as quickly as possible, before the energy is lost as heat."
LeopoldS

Strong evidence for d-electron spin transport at room temperature - 2 views

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    Strong evidence for d-electron spin transport at room temperature
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    WOW! Great non-local signals, at room temperature!!! Spin transistor on the way finally!? (of course electric field gate controlled is fundamental) See more about the "quest" for the spin transistor here: http://spectrum.ieee.org/semiconductors/processors/the-quest-for-the-spin-transistor
Lionel Jacques

Exotic explanation for Pioneer anomaly ruled out - 1 views

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    "Given that for both craft electricity is supplied by a radioisotope thermoelectric generator (RTGs) powered by the heat given off by the radioactive decay of plutonium - an energy source that decays exponentially with time - Turyshev and others suggested that the extra acceleration could be caused by thermal radiation being emitted from the craft in a preferred direction. "
Lionel Jacques

Quirky solar cell sets new efficiency record - physicsworld.com - 1 views

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    Researchers in the US have built a new type of solar cell that emits light as well as absorbs it, making it the most efficient solar cell ever developed. The efficiency of their prototype cell allows it to convert 28.6% of the Sun's energy into electricity.
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    well, the text is at best misleading ... the most efficient solar cells are well over 35% and approach the 40s with concentration! what they have done is to increase the limit of a single junction cell it seems to me ... still, nteresting though from text most details on how this was done are missing ... paper is not yet published, correct?
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    I learn of it in a workshop few weaks ago. It's on GaAs and I think that the key theoretical aspects are explained here: http://arxiv.org/abs/1106.1603
Lionel Jacques

IBM looking to put lithium-air batteries on the road - 0 views

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    f existing lithium-ion batteries were scaled up to match the range capacity of gas-powered vehicles, they would be unfeasibly large and heavy. Lithium-air batteries, which have the potential to provide energy densities that rivals traditional gasoline-powered engines, are seen as a possible solution.
Luís F. Simões

Cyborg snails power up : Nature News & Comment - 0 views

  • Molluscs with implanted biofuel cells produce electricity from glucose.
  • http://dx.doi.org/10.1021/ja211714w
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    coming soon to a garden near you: Snail Sensor Networks
LeopoldS

Nuclear powered drones? - 2 views

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    Not explicit but smells like RTGs
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    "The effort contrasted and compared eight heat sources technologies, three power conversion, two dual cycle propulsion system configurations, and a single electrical power generation scheme." Yes, it's about RTGs, at least partially.
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    The quote "it was disappointing to all that the political realities would not allow use of the results" may refer to RTGs too :-)
Lionel Jacques

LED converts heat into light - 0 views

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    "A light-emitting diode (LED) that emits more light energy than it consumes in electrical energy has been unveiled by researchers in the US. The device - which has a conventional efficiency of greater than 200% - behaves as a kind of optical heat pump that converts lattice vibrations into infrared photons, cooling its surroundings in the process."
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    Sorry, did not see that you have already posted this one ...
johannessimon81

3D-solar cells much more efficient - 1 views

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    3-dimensional silicon solar cell produces at least 250% of the power of a basic silicon solar cell.
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    Any idea of the technology behind ... Sounds too much advertisement what is in the article " Now, our near term objective is to continue to improve the fabrication process and the power output, as we optimize the cost of manufacturing. We believe that the result will be a 50% reduction in the cost of solar electricity. Perhaps the installed system cost savings will be even greater"
LeopoldS

Graphite + water = the future of energy storage - Monash University - 6 views

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    any idea how this works - who wants to have a closer look at it?
  • ...3 more comments...
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    Water is used for keeping the graphene stacks separate. Without water or some other separation method the different graphene stacks would just stick together and graphene would lose its nice properties (like a huge surface). So, water has nothing to do with energy but is just the material which keeps the graphene stacks at distance. The result is a gel. Still, energy needs to be stored in the gel.
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    and the different graphene layers act as anodes and cathodes??
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    Layer orientation in a gel is random. Additionally to that, cathodes and anodes are about charge seperation. Graphene layers are (as far as I understand) supposed to provide huge surfaces to which something, maybe a charge, can be attached. So do we need ions and electrons? Probably not. Probably just electrons which can travel easily through the gel. I guess the whole gel (and all layers inside) would be nagtively charged, making the gel blob a fluid cathode. But again, it's just a guess.
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    Wouldn't it be worth having a closer look?
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    it's still not clear to me how to get electricity in and out of this thing?
LeopoldS

Particle self-bunching in the Schwinger effect in spacetime-dependent electric fields - 3 views

shared by LeopoldS on 11 Nov 11 - No Cached
pacome delva liked it
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    magic :-)
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    "self-bunching effect" haha
santecarloni

Graphene Battery Turns Ambient Heat Into Electric Current - Technology Review - 0 views

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    "Physicists have built a graphene battery that harvests energy from the thermal movement of ions in solution." Can it actually work?
Tom Gheysens

Biomimicr-E: Nature-Inspired Energy Systems | AAAS - 4 views

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    some biomimicry used in energy systems... maybe it sparks some ideas
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    not much new that has not been shared here before ... BUT: we have done relativley little on any of them. for good reasons?? don't know - maybe time to look into some of these again more closely Energy Efficiency( Termite mounds inspired regulated airflow for temperature control of large structures, preventing wasteful air conditioning and saving 10% energy.[1] Whale fins shapes informed the design of new-age wind turbine blades, with bumps/tubercles reducing drag by 30% and boosting power by 20%.[2][3][4] Stingray motion has motivated studies on this type of low-effort flapping glide, which takes advantage of the leading edge vortex, for new-age underwater robots and submarines.[5][6] Studies of microstructures found on shark skin that decrease drag and prevent accumulation of algae, barnacles, and mussels attached to their body have led to "anti-biofouling" technologies meant to address the 15% of marine vessel fuel use due to drag.[7][8][9][10] Energy Generation( Passive heliotropism exhibited by sunflowers has inspired research on a liquid crystalline elastomer and carbon nanotube system that improves the efficiency of solar panels by 10%, without using GPS and active repositioning panels to track the sun.[11][12][13] Mimicking the fluid dynamics principles utilized by schools of fish could help to optimize the arrangement of individual wind turbines in wind farms.[14] The nanoscale anti-reflection structures found on certain butterfly wings has led to a model to effectively harness solar energy.[15][16][17] Energy Storage( Inspired by the sunlight-to-energy conversion in plants, researchers are utilizing a protein in spinach to create a sort of photovoltaic cell that generates hydrogen from water (i.e. hydrogen fuel cell).[18][19] Utilizing a property of genetically-engineered viruses, specifically their ability to recognize and bind to certain materials (carbon nanotubes in this case), researchers have developed virus-based "scaffolds" that
Thijs Versloot

Nanophononic metamaterials to boost thermoelectric performance - 0 views

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    Thermoelectric materials can see their performance radically improved via the utilization of an array of 'nanoscale pillars,' according to new research from the University of Colorado Boulder. These tiny pillars, built directly onto the thermoelectric material, will reduce the heat flow through the material by a factor of two while not affecting the electrical flow.
johannessimon81

Earth's inner core rotates eastward while the outer core rotates westward - 0 views

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    Apparently the core does not only produce a magnetic field - it is also an electric motor!
Athanasia Nikolaou

Polymer scientists jam nanoparticles, trapping liquids in useful shapes - 1 views

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    Inserting a droplet of polymer enriched water into oil and manipulating its shape by applying an electric field. The shape remains intact after cease of the forcing. <br /> "Russell (...) points out that the advance holds promise for a wide range of different applications including in drug delivery, biosensing, fluidics, photovoltaics, encapsulation and bicontinuous media for energy applications and separations media."
Thijs Versloot

Combined nanoplasmonic and optical resonators produces laser-like light emission - 0 views

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    "We have made optical systems at the microscopic scale that amplify light and produce ultra-narrowband spectral output," explained J. Gary Eden, a professor of electrical and computer engineering (ECE) at Illinois. "These new optical amplifiers are well-suited for routing optical power on a chip containing both electronic and optical components.
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