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Old 03-09-2013, 01:19 PM   #1681
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I still don't fully grasp it but I definitely have a better feel for what I'm seeing now, thanks.

Some folks at Lockheed & USC talking about D-Wave's quantum computers
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What's this about a brownie in motion?

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Old 03-09-2013, 02:27 PM   #1682
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^fing amazing....
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Old 03-12-2013, 08:18 PM   #1683
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I had to share this. Part of my homework today was to model a chaotic pendulum in python and plot the output for a given number of "snapshots" of time. This is a graph of the pendulum angle vs the angular velocity; it's gorgeous.
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Old 03-12-2013, 08:26 PM   #1684
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Old 03-14-2013, 11:38 AM   #1685
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Old 04-02-2013, 11:31 AM   #1686
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Old 04-03-2013, 09:44 AM   #1687
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I want to build an ionocraft now
http://phys.org/news/2013-04-thruste...ternative.html
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When a current passes between two electrodes-one thinner than the other-it creates a wind in the air between. If enough voltage is applied, the resulting wind can produce a thrust without the help of motors or fuel.

This phenomenon, called electrohydrodynamic thrust-or, more colloquially, "ionic wind"-was first identified in the 1960s. Since then, ionic wind has largely been limited to science-fair projects and basement experiments; hobbyists have posted hundreds of how-to videos on building "ionocrafts"-lightweight vehicles made of balsa wood, aluminum foil and wire-that lift off and hover with increased voltage. Despite this wealth of hobbyist information, there have been few rigorous studies of ionic wind as a viable propulsion system. Some researchers have theorized that ionic thrusters, if used as jet propulsion, would be extremely inefficient, requiring massive amounts of electricity to produce enough thrust to propel a vehicle. Now researchers at MIT have run their own experiments and found that ionic thrusters may be a far more efficient source of propulsion than conventional jet engines. In their experiments, they found that ionic wind produces 110 newtons of thrust per kilowatt, compared with a jet engine's 2 newtons per kilowatt. The team has published its results in the Proceedings of the Royal Society. Steven Barrett, an assistant professor of aeronautics and astronautics at MIT, envisions that ionic wind may be used as a propulsion system for small, lightweight aircraft. In addition to their relatively high efficiency, ionic thrusters are silent, and invisible in infrared, as they give off no heat-ideal traits, he says, for a surveillance vehicle. "You could imagine all sorts of military or security benefits to having a silent propulsion system with no infrared signature," says Barrett, who co-authored the paper with graduate student Kento Masuyama.

Read more at: http://phys.org/news/2013-04-thruste...ative.html#jCp
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Old 04-03-2013, 07:14 PM   #1688
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You want to float on a bubble of ions?
This is more fun.
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Old 04-11-2013, 10:04 AM   #1689
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Awesome and unique materials:
Gallium, the Metal That Melts at room temp.


The effects of Gallium on Aluminum


Spoon made of Gallium


If poured into a glass, sulfur hexafluoride sinks through normal air and pools invisibly at the bottom of the container. Just like water, it can support the weight of less dense objects on top of it. If inhaled, it does the opposite of helium and makes your voice much deeper.


Hydrophobic coatings. Put a droplet out on the treated part, and it will actively flee to the untreated area.


Hydrophobic sand.


Hot ice, scientifically known as sodium acetate, is a liquid that will turn solid at the slightest provocation. Touching it with your finger, bumping it too hard, or speaking a few angry words will cause it to spring from a clear, water-like state into solid ice-like crystals.




Nitinol, an alloy of nickel and titanium has the impressive ability to "remember" its original shape after you've gone and bent the crap out of it. All it takes is a little heat. I use this stuff all the time at work, it's pretty awesome. They even make a super elastic version of it that has a 200%+ elongation with shape memory all while still having the other properties of metals.



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Old 04-11-2013, 10:13 AM   #1690
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Europeans are stoopid. They keep splitting countries, while being jealous of our powa. Of course the EU is good for them, but does that have any real power?

Not even mentioning the efficiencies of larger countries.

As divided as this country is, at least we are one.
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Old 04-12-2013, 12:35 PM   #1691
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Chemistry is sooo fvcking cool, but it hates me. My brain just doesn't want to understand.

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Old 04-16-2013, 11:24 AM   #1692
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Old 04-17-2013, 11:14 PM   #1693
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Just a quick update on the Large Hardon Collider.

http://hasthelargehadroncolliderdest...eworldyet.com/
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Old 04-18-2013, 05:19 PM   #1694
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Solar technology keeps getting better.....




A special coating could dramatically improve the percentage of energy that can be harvested from solar cells by splitting photons in two, new research suggests.

For every photon (or particle of light) that hits a solar cell, the coating - called pentacene - doubles the number of electrons, and energy, that can be harvested, at least with high-energy blue or green wavelengths of light.

The findings were reported today (April 18) in the journal Science.

"We think it's an exciting direction for solar to improve its efficiency," said study co-author Marc Baldo, an electrical engineer at the Massachusetts Institute of Technology.
Low efficiency

One of the barriers to the wider adoption of solar energy is its high cost. One of the best ways to make the technology more affordable is to increase how efficiently the solar cells harvest energy from the sun, Baldo said.

Light creates electricity in silicon solar cells when each photon dislodges a single electron in the silicon, leaving behind a "hole" - an effective positive charge - where it once was. An electric field across the silicon drives the electrons away from the holes into a conducting metal material, where they then flow as current.

But silicon solar cells only absorb photons from some parts of the visible light spectrum. Sunlight at shorter blue and green wavelengths converts into heat, effectively wasting that light, Baldo told LiveScience.

Double the power
Baldo and his colleagues wanted to see if they could use the wasted blue and green light. Since the 1960s, scientists had noticed that under a magnetic field, photons hitting a material called pentacene underwent a process called singlet fission, in which two electrons were produced for every photon - two instead of one.

To see whether that process could be harnessed in solar cells, the researchers first measured the electrons that were produced for each photon of light. They confirmed that pentacene seemed to be producing two electrons for every photon of light.

Next, they wanted to see whether pentacene coated on top of a silicon solar cell could harness more energy. They found that a test solar cell worked in just that way, increasing the amount of energy harvested from the blue and green spectrum.

But the pentacene coating only works on blue and green wavelengths of light, not the entire visible spectrum, so the efficiency would only go up about 6 percent, Baldo said. "It doesn't do anything to red light or the infrared light, since we don't have enough energy to cut those photons in two," Baldo told LiveScience.

Boost in efficiency
The study is the first to show that the physical process that occurs in pentacene can actually be used to make energy, said Christopher Bardeen, a physical chemist at the University of California Riverside who was not involved in the study.

"It's a first step towards developing solar cells that could actually be significantly more efficient than today," Bardeen told LiveScience.
Follow Tia Ghose on Twitter @tiaghose. Follow LiveScience @livescience, Facebook & Google+. Original article on LiveScience.com.


3D-Textured Solar Cells Will Be Tested in Space
SPACE.com
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Solar Leasing Embraces ACPV: SolarBridge Technologies Partners with Sunnova, ET to Offer TrueAC Solar Leases
PRWeb
Solar leasing provider Sunnova partners with SolarBridge Technologies and ET Solar to offer residential ...
e Run to Help Herculaneum High School Improve Energy Efficiency
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Learning opportunities created for students through collaboration with Microgrid Energy and Missouri ...
Study: Solar Panels May Now Be a Net Energy Producer


http://news.yahoo.com/solar-cell-cou...191105885.html
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Old 04-18-2013, 05:26 PM   #1695
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More solar news...........a few years ago the efficiency of solar energy conversion was only about 5 percent, now it is up to 21 percent.

---------------------------
The EROEI for photovoltaics is estimated to be less than that of legacy oil and gas fields, but higher than the oil sands and ethanol. SUNPOWER (NASDAQ: SPWR) recently released its third-generation Maxeon solar cells in the X-Series panels with a confirmed 21.5% efficiency. These panels are some of the most efficient commercially available panels on the market. They are backed by a 25-year warranty that is one of the strongest in the industry.

http://beta.fool.com/mrcanadian1/201...gyholnk0000001

Our top-of-the-line solar panels give homeowners more energy. They deliver the highest efficiency available in a residential solar panel today, at a record-breaking 21.5%.1 That means homeowners get more electricity, more flexibility, more peace of mind, and lower electricity bills.


http://us.sunpowercorp.com/
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Old 04-19-2013, 03:22 PM   #1696
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This is 13 light years tall
http://www.spacetelescope.org/static.../heic1307a.jpg
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Old 04-19-2013, 04:37 PM   #1697
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It is hard for me to wrap my mind around something that large.

Especially when you consider every speck of 'dust' in that cloud is a star or a planet.
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Old 04-19-2013, 04:50 PM   #1698
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^ Amazing isn't it? Really goes to show how insignificant we really are in the universe. I think it would be awesome to see what the sky looks like from a planet in a nebula, I'm sure it looks incredible.

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Old 04-19-2013, 05:04 PM   #1699
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^ Amazing isn't it? Really goes to show how insignificant we really are in the universe. I think it would be awesome to see what the sky looks like from a planet in a nebula, I'm sure it looks incredible.
I want to see pics of Earth from Mars or Venus. And I want to see pics of Mars' moons as if someone was standing on Mars.

Or pics of Jupiter from Mars and what it would look like to have a visual of being on Jupiter with all those moons in the sky at one time.
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Old 04-19-2013, 05:16 PM   #1700
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That's amazing. Simply freaking awesome.
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