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Thijs Versloot

Linked Open Earth Observation Data for Precision Farming - 1 views

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    Lots of Earth Observation data has become available at no charge in Europe and the US recently and there is a strong push for more open EO data. With precision farming, advanced agriculture using GPS, satellite observations and tractors with on-board computers, the farming process is performed as accurately and efficiently as possible. This is achieved by combining data from earth observations with other geospatial sources such as cadastral data, data on the quality of the soil, vegetation and protected areas. This enables the farmer to find the optimal trade-off in maximizing his yield with minimal use of fertilizers and pesticides while respecting environmental protection.
Athanasia Nikolaou

Perovskite Solar Cells Get the Lead Out - 1 views

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    The fast developping solar cell technology of perovskites. "Perovskites are a broad class of crystalline minerals that have been known for well over a century. But their ability to convert solar energy to electricity came to light only in 2009. Since then, the efficiency of perovskite solar cells has climbed from 3.8% to 19.3%, a pace of improvement unmatched by any other solar technology. By comparison, crystalline silicon solar cells, the leading commercial technology, convert about 25% of solar energy to electricity."
johannessimon81

The Universe Is Programmable. We Need an API for Everything - 3 views

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    Interesting ideas - though some metaphors are a bit far fetched. Personally, I think it could be interesting if every scientific article would also have a how-to or tutorial section that gives a recipe of how to apply the newly gained knowledge. Of course, that might be tough to do... :-)
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    The API of the world is already there (a bit), it is the previous knowledge developed by others. Open Source projects such as the wheel or the brick, allow everyday amazing new APPs to be build such as buildings and cars .... There still is merit, though, in learning from software developments techniques in the everyday world projects. This is indeed the motivation for the ACT to do work in open source (SOCIS, GSoC) and push its members to use stuff like wiki, svn, github, jenkins, and alike. This way we are performing and fostering (http://www.oxforddictionaries.com/definition/english/foster) research into working methods in the hope we will be able to export some of its benefit to the larger ESA.
Beniamino Abis

Laser-Plasma Particle Accelerator - 1 views

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    Can we have one?
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    They say they create 2 GeV electrons in a very small setup. However the laser they use is more than 10 meters in length. Still a really nice result.
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    Compared to a 27km circumference this is major achievement and it is indeed already foreseen that future colliders will include this technology as beam fillers and pre-accelerators at some point. The technique is quite elegant and a lot more energy efficient. Nevertheless, there are also thoughts that future particle colliders might actually go towards space and study collisions orginating from extremely energetic cosmic particles
Thijs Versloot

Graphene coated silicon super-capacitors for energy storage - 1 views

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    Recharge in seconds and efficiently store power for weeks between charges. Added bonus is the cheap and abundant components needed. One of the applications they foresee is to attach such a super-capacitor to the back of solar panels to store the power and discharge this during the night
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    very nice indeed - is this already at a stage where we should have a closer look at it? what you think? With experience in growing carbon nanostructures, Pint's group decided to try to coat the porous silicon surface with carbon. "We had no idea what would happen," said Pint. "Typically, researchers grow graphene from silicon-carbide materials at temperatures in excess of 1400 degrees Celsius. But at lower temperatures - 600 to 700 degrees Celsius - we certainly didn't expect graphene-like material growth." When the researchers pulled the porous silicon out of the furnace, they found that it had turned from orange to purple or black. When they inspected it under a powerful scanning electron microscope they found that it looked nearly identical to the original material but it was coated by a layer of graphene a few nanometers thick. When the researchers tested the coated material they found that it had chemically stabilized the silicon surface. When they used it to make supercapacitors, they found that the graphene coating improved energy densities by over two orders of magnitude compared to those made from uncoated porous silicon and significantly better than commercial supercapacitors. Transmission electron microscope image of the surface of porous silicon coated with graphene. The coating consists of a thin layer of 5-10 layers of graphene which filled pores with diameters less than 2-3 nanometers and so did not alter the nanoscale architecture of the underlying silicon. (Cary Pint / Vanderbilt) The graphene layer acts as an atomically thin protective coating. Pint and his group argue that this approach isn't limited to graphene. "The ability to engineer surfaces with atomically thin layers of materials combined with the control achieved in designing porous materials opens opportunities for a number of different applications beyond energy storage," he said.
Nina Nadine Ridder

Testing shows using microwaves to propel a craft into space might work - 4 views

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    A team of researchers at Colorado based Escape Dynamics is reporting that initial tests indicate that it might really be possible to launch space-planes into space using microwaves sent from the ground, to allow for a single stage spacecraft. If the idea pans out, the cost savings for sending satellites (or perhaps humans) into orbit could be considerable.
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    Not very new, but a very slick video nonetheless! Will it work? I am not so sure whether "just engineering" applies in this case. The array of antenna's required is quite significant to compensate for beam losses. Wall plug efficiency is not that high therefore, then again.. solar energy is for free almost in the future so who cares.. let's go for it! :)
Nina Nadine Ridder

Going solid-state could make batteries safer and longer-lasting - 3 views

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    If you pry open one of today's ubiquitous high-tech devices-whether a cellphone, a laptop, or an electric car-you'll find that batteries take up most of the space inside. Indeed, the recent evolution of batteries has made it possible to pack ample power in small places.
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    solidstate batteries would be perfect indeed, but up to now I know of no solid electrolyte that can do the trick. The article itself does not mention any material beyond superionic lithium-ion conductors, but does not specify which one in particular. The premis seems to be "if it conducts fast enough, the battery can conduct efficiently"
Nina Nadine Ridder

Microscopic fish are 3-D-printed to do more than swim: Researchers demonstrate a novel ... - 1 views

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    Useful for space exploration, e.g. subsurface water reservoirs such as Europa or Enceladus? Nanoengineers at the University of California, San Diego used an innovative 3-D printing technology they developed to manufacture multipurpose fish-shaped microrobots -- called microfish -- that swim around efficiently in liquids, are chemically powered by hydrogen peroxide and magnetically controlled.
Daniel Hennes

V3Solar puts a new spin on PV efficiency - 1 views

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    "V3Solar has developed a cone-shaped solar energy harvester that is claimed to generate over 20 times more electricity than a flat panel thanks to a combination of concentrating lenses, dynamic spin, conical shape, and advanced electronics."
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    Hmm.. that seems counter intuitive... how would it ever be that much better than a flat panel? Rotating the PV will only make sure only parts are illuminated. Operating temperature is a better argument, but that comes at the cost of exposure. Came across this little gem of a webpage, maybe we should outsource our impossibility EM drive work next time? :) https://www.metabunk.org/debunked-v3solars-spinning-solar-panel-cone-spin-cell-coolspin.t1166/
jcunha

New methods to make longer streams of plasma with greater longevity could lead to laser... - 0 views

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    More developments in the laser filamentation community. Makes me wonder again about Christophe's ideas for a space-formed filament as new and efficient microwave waveguide.
jcunha

Introducing A Brain-inspired Computer [IBM TrueNorth] - 0 views

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    Built in Silicon technology (Samsung's 28 nm process), its power is measured as one million neurons and 256 million synapses. It contains 5.4 million transistor being the largest IBM chip in these terms. All this said, it consumes less than 100 mW!! "These systems can efficiently process high-dimensional, noisy sensory data in real time, while consuming orders of magnitude less power than conventional computer architectures." IBM is working with initLabs to integrate the DVS retinal camera with these chips = real time image neuro-like image processing. In what seems to be a very successful project hugely funded by DARPA, "Our sights are now set high on the ambitious goal of integrating 4,096 chips in a single rack with 4 billion neurons and 1 trillion synapses while consuming ~4kW of power."
jcunha

Chemical analysis in Earth and Space via Raman Spectroscopy - 2 views

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    "A new lightweight, energy-efficient tool for analyzing a material's chemical makeup could improve the detection abilities of various technologies, ranging from bomb-detecting drones to space rovers searching for signs of life". Raman Spectroscopy is about measuring vibrational modes in molecules. This vibrational modes are in the meV typically, turning Raman Spectroscopy into a high precision technique. This impressive work shows a new technique based on the use of optical fibers coupled to photomultipliers allowing its use, author's word, in extreme conditions such as unmanned aircraft vehicles (UAVs) and Mars/Moon rovers.
Thijs Versloot

Electromagnetism generated by symmetry breaking in dielectrics - 0 views

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    Using dielectric materials as efficient EM radiators and receivers can scale down these antenna's to the chip level, reducing both weight and power consumption. The infamous internet-of-things one step closer. But could we also transmit power this way?? "In dielectric aerials, the medium has high permittivity, meaning that the velocity of the radio wave decreases as it enters the medium," said Dr Dhiraj Sinha, the paper's lead author. "What hasn't been known is how the dielectric medium results in emission of electromagnetic waves. This mystery has puzzled scientists and engineers for more than 60 years." The researchers determined that the reason for this phenomenon is due to symmetry breaking of the electric field associated with the electron acceleration The researchers found that by subjecting the piezoelectric thin films to an asymmetric excitation, the symmetry of the system is similarly broken, resulting in a corresponding symmetry breaking of the electric field, and the generation of electromagnetic radiation.
aborgg

Graphene sponge can absorb light and emit energetic electrons for breakthrough solar sa... - 1 views

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    The unique structure and properties of graphene and the morphology of the bulk graphene material make it capable of not only absorbing light at various wavelengths but also emitting energetic electrons efficiently enough to drive the bulk material following Newtonian mechanics.
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    Hard to believe this should actually work, but would be quite a breakthrough indeed. I wonder, since the material should build up a significant electric potential over time, thus, pulling back the ejected electrons. Well, the paper apparently is not peer-reviewed, and I found some rather critical comments in some forums. Let's see if the experiment will be verified by another research team in due course.
Joris _

Spaceflight Now | Breaking News | Space agencies tackle waning plutonium stockpiles - 2 views

  • For every 100 watts of heat that I've got, the best I can do is get 8 watts of electricity
  • NASA is developing an Advanced Stirling Radioisotope Generator to improve the efficiency by a factor of four
Juxi Leitner

Fabbaloo - Fabbaloo Blog - Sintering the Moon - 0 views

  • So let's recap here: ubiquitous uniformly-powdery lunar soil can be very efficiently fused using microwaves. That sounds very similar to technologies used in 3D printing,
sreejanag

The creator of Dilbert and his experience with energy efficiency - 4 views

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    Funny read, if nothing else!
Nicholas Lan

ignobel winners 2010 - 2 views

shared by Nicholas Lan on 14 Oct 10 - Cached
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    cheers to luca for pointing out the management one. netlogo model "demonstrating mathematically that organizations would become more efficient if they promoted people at random."
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    do you trust netlogo for this? :-)
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    for the ignobel or the random promotions ? :P
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    Nah... Marek's recognition reward definitively goes to: "Microbiological Laboratory Hazard of Bearded Men" (...) WHO ATTENDED THE CEREMONY: Manuel S. Barbeito was unable to travel, due to health reasons. :D
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    The page itself should be awarded with the ugliest layout. I have suggested to our management the implementation of the random promotion. Perhaps it is the future of democracy: representatives chosen at random.
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    you mean "your management" at your current place?
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    Yes, it is not what is written? Indeed, it is already implemented. You are talking with the director of the Institute. I have been unlucky with the toss.
LeopoldS

Comparison of Two GaN Transistor Technologies in Broadband Power Amplifiers  ... - 1 views

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    interesting paper for wireless energy transmission ... Duncan have a look ...
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    Yeah, its nice to see some research into semiconductors which aren't silicon. This paper would be useful for us if we wanted to do a study of the efficiency of the DC to microwave conversion systems for SPS.
Joris _

Is It Time To Revamp Systems Engineering? | AVIATION WEEK - 1 views

  • They both believe the systems engineering processes that have served the aerospace and defense community since pre-Apollo days are no longer adequate for the large and complex systems ­industry is now developing.
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    1) it has to actively work and produce a result that's what you intended 2) the design must be robust. 3) it should be efficient 4) it should minimize unintended consequences. "But we have to establish a formal, mathematically precise mechanism to measure complexity and adaptability . . . [where] adaptability means the system elements have sufficient margin, and can serve multiple purposes." "We need to break the paradigm of long cycles from design to product" some interesting questions....
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    indeed ... already hotly debated in CDF ... any suggestions in addition to what we already contributed to this (e.g. system level optimisation)
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    what is the outcome of the CDF study ? I think actually that optimisation is not at all the key point. As it is stressed in this news, it is robustness (points 2 and 4). This is something we should think about ...
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    SYSTEM OF SYSTEMS, SYSTEM OF SYSTEMS!!! :-D
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