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pacome delva

A Battery Made With Paper - 0 views

sciencenow.sciencemag.org/...2

phy nrg nan carbon_nanotubes batteries

shared by pacome delva on 09 Dec 09 - Cached
LeopoldS liked it
  • Researchers are reporting that they've made batteries and other energy-storage devices by printing layers of carbon nanotube–based ink atop standard photocopy paper. The result is a highly conductive sheet that can carry a charge and be easily incorporated into a flexible battery. Because of paper's low cost, that could help lower the price of batteries used in electric vehicles, wind farms, and other renewable sources.
  • LeopoldS on 13 Dec 09
     
    can we use it for space :-) ?
pacome delva

Is exoplanet a 'waterworld'? - 0 views

physicsworld.com/...41258

phy astrophysics exoplanet

shared by pacome delva on 17 Dec 09 - Cached
  • Together, these parameters suggest that GJ 1214b has the same density of water – and Charbonneau told physicsworld.com that it is very likely that the exoplanet is made entirely of liquid water.
  • The research is reported in Nature.
pacome delva

Algae Show a Knack for Quantum Mechanics -- Berardelli 2010 (203): 3 -- ScienceNOW - 1 views

sciencenow.sciencemag.org/...3

phy bio quantum_physics photosynthesis

shared by pacome delva on 04 Feb 10 - Cached
  • the discovery will open up a new field of research, and it could lead to a new generation of superefficient light-sensitive devices.
  • the experiments showed that the electron vibrations resulting from the photons striking the antennas persisted at full strength four times longer than expected. The reason, the researchers report this week in Nature, is that quantum mechanics controls the energy. "It was an utter surprise," says physical chemist and co-author Gregory Scholes of the University of Toronto in Canada. For the results to have occurred, he explains, a property called quantum coherence must have been operating.
  • the research "will open an entirely new area of biophysics." And that effort should have "huge implications," he says, "not only for how we think about biophysics, but also light harvesting and light-sensitive devices."
  • pacome delva on 04 Feb 10
     
    Very interesting work, showing that apparently algae mastered quantum coherence a few years before us... Inspiring for a new type of light-sensitive devices, and perhaps other applications...
Francesco Biscani

How to quadruple your productivity with an army of student interns - 6 views

blog.ksplice.com/...oductivity-with-an-intern-army

inf

shared by Francesco Biscani on 13 Mar 10 - Cached
  • Francesco Biscani on 13 Mar 10
     
    Potential lessons for out own trainee program?
  • LeopoldS on 16 Mar 10
     
    well - part of it we already do ... e.g. : (did you see the picture in the report?) "Tolerate a little crowding. It took a little creativity to suddenly find a dozen new workspaces in our two-room office. Fortunately, we've found that a room can always fit one more person-and by induction, you can fit as many as you need. (All those years we spent proving math theorems came in handy after all.) "
Juxi Leitner

Grappling With Space Debris - 1 views

www.spacedaily.com/...ing_With_Space_Debris_999.html

space debris security

shared by Juxi Leitner on 23 Mar 10 - Cached
  • Fortunately, as we speak, the very best space engineers are tackling the problem of how to tackle space debris and get it out of the way.
  • Juxi Leitner on 23 Mar 10
     
    another of those articles...
  • nikolas smyrlakis on 24 Mar 10
     
    i guess when it says about the very best engineers tackling the problem as we speak, it refers to our brainstorms. How did they find out?
LeopoldS

Spaceflight Now | Atlas Launch Report | Air Force spaceplane is an odd bird with a twisted past - 3 views

spaceflightnow.com/...100402x37update

spaceflight suborbital defence

shared by LeopoldS on 06 Apr 10 - Cached
  • LeopoldS on 06 Apr 10
     
    Juxi are you following this one? any idea on its purpose?
  • Ma Ru on 07 Apr 10
     
    Not that I'm an expert in the field in any way, but there are two things I could think of: 1) possibility of bringing the payload back means that it can collect huge amounts of data which wouldn't be possible to be transferred via radio in reasonable time and/or you can bring back data you don't want to be intercepted by enemy 2) I remember reading somewhere that possibility of re-entry from orbit means you can strike any country without violating the airspace of the neighbouring countries. As the project is now managed by military, a purely civil purpose can be safely ruled out in my opinion.
pacome delva

Fruit Fly Aerial Maneuver Explained - 1 views

focus.aps.org/st13

bio biomimicry fruit_fly

shared by pacome delva on 12 Apr 10 - Cached
LeopoldS liked it
  • Insects can execute flying feats more impressive than fighter jets, and a team of researchers has now learned the trick behind one of them. They used high speed video cameras and a new 3D reconstruction technique to show how fruit flies execute their acrobatic turns. As they report in the 9 April Physical Review Letters, despite the complex wing motions, a fly can execute quick pirouettes by adjusting just a single parameter that controls the difference between the way its left and right wings oscillate. The results may be relevant for engineers designing flight control strategies for tiny robotic insects for search-and-rescue and surveillance.
pacome delva

Mapping Turbulence in the Solar Wind - 0 views

focus.aps.org/st16

phy astrophysics solar_wind formation_flying turbulence

shared by pacome delva on 03 May 10 - Cached
  • a team reports studying the turbulent flow of solar wind particles by monitoring the accompanying waves of magnetic field. The team used a cluster of satellites to measure the field in unprecedented spatial detail. They found that the waves aren't equally strong in all directions but are larger in certain preferred directions, as theorists had predicted. The observation will help astrophysicists better understand the consequences of the solar wind, including its effect on the transmission of cosmic rays, particles that arrive at Earth from elsewhere in our galaxy.
Juxi Leitner

A Cyborg Space Race - 1 views

www.spacedaily.com/...A_Cyborg_Space_Race_999.html

exploration robot human tech

shared by Juxi Leitner on 02 May 10 - Cached
  • There is more discussion in the space community on how to alter entire planets to suit humans - a process called "terraforming" - than there is on changing man to suit space.
  • making the machines our "avatars" for space exploration
  • Perhaps a brain implant linking us to our robots would be the next step in space exploration, greatly reducing communication time across the vast expanse of space
pacome delva

Dark matter 'no result' comes under fire - 3 views

physicsworld.com/...42554

phy astrophysics dark_matter controversy

shared by pacome delva on 07 May 10 - Cached
  • On Monday the XENON100 collaboration published an analysis of the first experimental results from its dark-matter detector. It reported no evidence of dark matter, the substance thought to constitute over 80% of mass in the universe. The experiment covered a similar parameter range as dark-matter searches DAMA and CoGeNT, which have previously claimed possible evidence for dark matter. As a result, the XENON100 team concluded that both the DAMA and CoGeNT evidence could be excluded. But now the DAMA and CoGeNT collaborations claim that the XENON100 researchers' analysis is flawed, and that their original evidence for dark matter should remain intact
Isabelle DB

Global Warning - a project of the National Security Journalism Initiative - 0 views

global-warning.org/main

Arctic Climate Change Global Warming and Security Environment Energy Youth Students Water Military

shared by Isabelle DB on 12 Jan 11 - No Cached
  • Isabelle DB on 12 Jan 11
     
    "WASHINGTON, D.C. - In a three-month investigation, a team of Northwestern University student reporters has found that the US nation's security establishment is not adequately prepared for many of the environmental changes that are coming faster than predicted and that threaten to reshape demands made on the military and intelligence community. This is despite the fact that the Defense Department has called climate change a potential "accelerant of instability." The Medill School of Journalism graduate student team began publication on January 10 of its findings on the national security implications of climate change with a series of print, video and interactive stories."
Giusi Schiavone

coming back to the Moon - 2 views

www.googlelunarxprize.org/...about-the-prize

shared by Giusi Schiavone on 28 Feb 11 - Cached
  • Giusi Schiavone on 28 Feb 11
     
    The $30 million Google Lunar X PRIZE will be awarded to the first privately funded teams to build robots that successfully land on the lunar surface, explore the Moon by moving at least 500 meters (~1/3 of a mile), and return high definition video and imagery. The Google Lunar X PRIZE expires whenever all prizes are claimed, or at the end of 2015. As of midnight on December 31st, 2010, the team registration for the Google Lunar X PRIZE is closed. No additional applicants will be accepted to join the competition. ...too late
  • LeopoldS on 02 Mar 11
     
    please see the act report on this from a few years ago - its on the wiki - should we maybe make an update analysis? any volunteers? Giusi?
  • Giusi Schiavone on 02 Mar 11
     
    I'll have a look
Luís F. Simões

The Fallout of a Helium-3 Crisis : Discovery News - 3 views

news.discovery.com/...fall-of-a-helium-3-crisis.html

helium crisis moon mining

shared by Luís F. Simões on 22 Feb 11 - No Cached
  • So short in fact, that last year when the looming crisis, which reporters had been covering for years, became official, the price of helium-3 went from $150 per liter to $5,000 per liter.
  • The science, medical and security uses for helium-3 are so diverse that the crisis banded together a hodge-podge of universities, hospitals and government departments to try and find workable alternatives and engineer ways to recycle the gas they do have.
  • Luís F. Simões on 22 Feb 11
     
    So, which shall it be? Are we going to increase the production of hydrogen bombs, or can we finally go back to the Moon (http://en.wikipedia.org/wiki/Helium-3#Extraterrestrial_supplies) ?
  • dejanpetkow on 23 Feb 11
     
    None of these. Either you recycle, or you take it from natural sources on Earth. Although most people don't know - there is plenty of natural He3 on Earth. It's just nonsens to use it for energy production (in fusion reactors) since the energy belance for getting the He3 from these source on Earth is just negative. Or you try to substitute He3.
Giusi Schiavone

Glutamate receptors-like (GLRs) and D-serine connecting plant with animal nervous system - 3 views

neurosciencenews.com/ion-and-animal-nervous-systems

shared by Giusi Schiavone on 21 Mar 11 - No Cached
  • Giusi Schiavone on 21 Mar 11
     
    The release reports that researcher José Feijó says the " findings, implicating analogous genes in growth processes in both plants and animals, underscores how evolution re-uses successful mechanisms, over and over again."
Christos Ampatzis

Academic publishers make Murdoch look like a socialist - 4 views

www.guardian.co.uk/...c-publishers-murdoch-socialist

science

shared by Christos Ampatzis on 02 Sep 11 - No Cached
  • Christos Ampatzis on 02 Sep 11
     
    Who are the most ruthless capitalists in the western world? Whose monopolistic practices make Walmart look like a corner shop and Rupert Murdoch a socialist? You won't guess the answer in a month of Sundays. While there are plenty of candidates, my vote goes not to the banks, the oil companies or the health insurers, but - wait for it - to academic publishers.
  • LeopoldS on 11 Sep 11
     
    fully agree ... "But an analysis by Deutsche Bank reaches different conclusions. "We believe the publisher adds relatively little value to the publishing process … if the process really were as complex, costly and value-added as the publishers protest that it is, 40% margins wouldn't be available." Far from assisting the dissemination of research, the big publishers impede it, as their long turnaround times can delay the release of findings by a year or more." very nice also: "Government bodies, with a few exceptions, have failed to confront them. The National Institutes of Health in the US oblige anyone taking their grants to put their papers in an open-access archive. But Research Councils UK, whose statement on public access is a masterpiece of meaningless waffle, relies on "the assumption that publishers will maintain the spirit of their current policies". You bet they will. In the short term, governments should refer the academic publishers to their competition watchdogs, and insist that all papers arising from publicly funded research are placed in a free public database. In the longer term, they should work with researchers to cut out the middleman altogether, creating - along the lines proposed by Björn Brembs of Berlin's Freie Universität - a single global archive of academic literature and data. Peer-review would be overseen by an independent body. It could be funded by the library budgets which are currently being diverted into the hands of privateers. The knowledge monopoly is as unwarranted and anachronistic as the corn laws. Let's throw off these parasitic overlords and liberate the research that belongs to us."
  • Christos Ampatzis on 12 Sep 11
     
    It is a really great article and the first time I read something in this direction. FULLY AGREE as well. Problem is I have not much encouraging to report from the Brussels region...
Luís F. Simões

Wind Power Without the Blades: Big Pics : Discovery News - 4 views

news.discovery.com/...-power-without-the-blades.html

NRG wind energy biomimicry

shared by Luís F. Simões on 19 Sep 11 - No Cached
  • The carbon-fiber stalks, reinforced with resin, are about a foot wide at the base tapering to about 2 inches at the top. Each stalk will contain alternating layers of electrodes and ceramic discs made from piezoelectric material, which generates a current when put under pressure. In the case of the stalks, the discs will compress as they sway in the wind, creating a charge.
  • Based on rough estimates, said Núñez-Ameni the output would be comparable to that of a conventional wind farm covering the same area
  • After completion, a Windstalk should be able to produce as much electricity as a single wind turbine, with the advantage that output could be increased with a denser array of stalks. Density is not possible with conventional turbines, which need to be spaced about three times the rotor's diameter in order to avoid air turbulence. But Windstalks work on chaos and turbulence so they can be installed much closer together, said Núñez-Ameni.
  • ...1 more annotation...
  • Núñez-Ameni also reports that the firm is currently working on taking the Windstalk idea underwater. Called Wavestalk, the whole system would be inverted to harness energy from the flow of ocean currents and waves.
  • Luís F. Simões on 19 Sep 11
     
    additional information: http://atelierdna.com/?p=144
  • LeopoldS on 24 Sep 11
     
    isn't this a bit of a contradiction: on the one hand: "Based on rough estimates, said Núñez-Ameni the output would be comparable to that of a conventional wind farm covering the same area" and on the other: "After completion, a Windstalk should be able to produce as much electricity as a single wind turbine, with the advantage that output could be increased with a denser array of stalks. Density is not possible with conventional turbines, which need to be spaced about three times the rotor's diameter in order to avoid air turbulence. " still, very interesting concept!
nikolas smyrlakis

SPACE.com -- White House Panel Backs Commercial Alternatives to NASA's New Rocket - 1 views

www.space.com/...spaceflight-review-report.html

space.com nasa human spaceflight aresI

shared by nikolas smyrlakis on 26 Oct 09 - Cached
  • nikolas smyrlakis on 26 Oct 09
     
    "Seeking a Human Spaceflight Program Worthy of a Great Nation" - NASA's and Lockheed Martin's 2nd thoughts of returning to the moon..
Juxi Leitner

Martian Projects Shall Use Nuclear Energy - 0 views

www.marsdaily.com/...ll_Use_Nuclear_Energy_999.html

technology nrg nuclear propulsion

shared by Juxi Leitner on 02 Nov 09 - Cached
  • Since current rocket technologies are not sufficient for the future exploration of Mars and the whole Solar system, and since no alternative energy resources have been found as of now, the only possible way to implement those projects would be by using nuclear energy, Lopota said at an academic conference on aerospace.
  • LeopoldS on 04 Nov 09
     
    blablabla
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