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helium discussion - 0 views

www.infidels.org/...helium.html helium atmosphere science
shared by terencepf on 03 Dec 10 - No Cached
  • terencepf on 03 Dec 10
     
    This link has a nice concise explanation of helium escaping the atmosphere. http://www.astronomynotes.com/solarsys/s3.htm (this link describes the mechanics of particles escaping the atmosphere, this includes escape velocity, thermal and nonthermal process) http://www.springerlink.com/content/k094u75188h64516/fulltext.pdf ( and if you are really interested, this paper discuss helium in the atmosphere (production and loss) in much more detail )
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Visualizing science - 2 views

vimeo.com/6644720 fun inf
shared by Ian Carnelli on 16 Feb 10 - Cached
  • Ian Carnelli on 16 Feb 10
     
    toxiclibs is an independent, open source library collection for computational design tasks with Java & Processing
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The Quasar That Built a Galaxy - 0 views

sciencenow.sciencemag.org/...2 phy astrophysics quasars galaxy_formation
shared by pacome delva on 03 Dec 09 - Cached
Nicholas Lan liked it
  • One of the quasar's jets is aimed directly at the galaxy, and the team thinks it's likely that the jet is driving the star-making process by blasting matter into the galaxy.
  • The discovery creates a new picture of galaxy formation
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Quantum computer takes on quantum chemistry - physicsworld.com - 1 views

physicsworld.com/...41432 phy quantum_computation
shared by pacome delva on 21 Jan 10 - Cached
  • The process is done 20 times to create a 20-bit binary number that represents the energy of the hydrogen molecule to a precision of about one part per million.
  • Aspuru-Guzik described the two-qubit calculation as a "baby step forward," and added that a 128-qubit system would be needed to work out the energy levels of a simple molecule such as water.
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artificial inorganic leaf (AIL) - 1 views

www.sciencedaily.com/...100325131549.htm nrg nan bio
shared by Nicholas Lan on 29 Mar 10 - Cached
  • Nicholas Lan on 29 Mar 10
     
    bit confused about what they actually have achieved so far but sounds like it might turn out to be interesting. "The scientists first infiltrated the leaves of Anemone vitifolia -- a plant native to China -- with titanium dioxide in a two-step process. Using advanced spectroscopic techniques, the scientists were then able to confirm that the structural features in the leaf favorable for light harvesting were replicated in the new TiO2 structure. Excitingly, the AIL are eight times more active for hydrogen production than TiO2 that has not been "biotemplated" in that fashion. AILs also are more than three times as active as commercial photo-catalysts. Next, the scientists embedded nanoparticles of platinum into the leaf surface. Platinum, along with the nitrogen found naturally in the leaf, helps increase the activity of the artificial leaves by an additional factor of ten."
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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
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Public asked to define a galaxy - 1 views

www.abc.net.au/...3117570.htm space open-thing-stuff
shared by Joris _ on 22 Jan 11 - No Cached
  • Joris _ on 22 Jan 11
     
    "collective wisdom" to define what a "galaxy" is. Is it really a good approach ? It does not seem any sociologist is involved in the process. http://arxiv.org/PS_cache/arxiv/pdf/1101/1101.3309v1.pdf
  • Luzi Bergamin on 22 Jan 11
     
    How about "collective wisdom" on what "stupid research" is?
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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."
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[1105.0158] Detecting emergent processes in cellular automata with excess information - 2 views

arxiv.org/1105.0158 nan AI technology
shared by santecarloni on 10 May 11 - No Cached
  • santecarloni on 10 May 11
     
    maybe this is useful...
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Honda Improves Process for Making Nanotubes - Reviews by PC Magazine - 0 views

www.pcmag.com/...0,2817,2353656,00.asp technology phy nanotubes NRG
shared by Juxi Leitner on 08 Oct 09 - Cached
  • Honda Research Institute USA plans to publish results of new research on Friday that shows that the company has improved the success rate of growing carbon nanotubes with metallic properties, a key to using them in future power devices.
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Physics - Addressing the crowd - 0 views

physics.aps.org/...PhysRevLett.103.080404 phy atom_lattice nan
shared by pacome delva on 31 Aug 09 - Cached
  • Setting up patterns by removing atoms from specific sites allows the team to watch in situ tunneling processes and microengineer novel atomic interactions.
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The Origin of Artificial Species: Creating Artificial Personalities - 0 views

www.physorg.com/news161517506.html ai behaviour robots
shared by Joris _ on 15 May 09 - Cached
  • The first artificial creature to receive the genomic personality is Rity, a dog-like software character that lives in a virtual 3D world in a PC
  • In Rity, internal states such as motivation, homeostasis and emotion change according to the incoming perception
  • The internal control architecture processes incoming sensor information, calculates each value of internal states as its response, and sends the calculated values to the behavior selection module to generate a proper behavior.
  • Joris _ on 15 May 09
     
    they have found Christina's dog !!
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Ion trap quantum computing - 0 views

www.physorg.com/news161348276.html
shared by Joris _ on 14 May 09 - Cached
  • One of the most important considerations in quantum computing is the fact that quantum computing scales polynomially, rather than exponentially, as classical computing does
  • his process would allow us to take problems of great complexity and still solve them on a humanly possible timescale. This could provide the key to modeling complex systems - especially perhaps in biology - that we can’t solve now. This would be a tremendous advantage over classical computing.
  • Joris _ on 14 May 09
     
    a follow-up question: Can quantum computer be efficient for global optimisation ?
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MIT OpenCourseWare | Sloan School of Management | 15.351 Managing the Innovation Proces... - 0 views

ocw.mit.edu/...index.htm innovation management Managment
shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Good for the coming group discussion - DI
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BBC NEWS | Asia-Pacific | Scientists bring snow to Beijing - 2 views

news.bbc.co.uk/...8337337.stm china asia Weather Modification Office climate change
shared by nikolas smyrlakis on 02 Nov 09 - Cached
  • nikolas smyrlakis on 02 Nov 09
     
    Did you know about this Weather Modification Office? Promising or dodgy?
  • Friederike Sontag on 03 Nov 09
     
    Yes. In China it happens apparently quite often that weather is regionally modified, e.g. in order to have good weather conditions during certain events (like olympics in Beijing). But also in other countries weather modification is applied, for reasons of agriculture, pollution, skiing, etc. Obviously, one wonders on the environmental impact of such an artificial cloud feeding process with silver iodide. I just googled, stumbling upon this report http://www.weathermodification.org/AGI_toxicity.pdf which published the result: no environmentally harmful effects...
  • Friederike Sontag on 03 Nov 09
     
    and w.r.t. ur question: I mean different weather conditions which we experience locally (like droughts or other extreme weather events) are (often) due to large-scale/global climatic changes. Hence, cloud seeding just describes a local, short-term mitigation of these events. However, there is a geoengineering proposal (so climate modification) which also suggests to seed clouds above the sea (i.e. increase cloud coverage, e.g. by using seaspray as cloud condesation nuclei), thereby increasing the planetary albedo (Earth reflectance) and reducing the energy reaching the Earth surface. If this idea is promising or not, I couldn't judge upon, but for sure it is worthwhile to take a closer look at.
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Prepare and transmit electronic text - American Institute of Physics - 2 views

www.aip.org/...compuscript.html acta futura publications latex xml INF
shared by LeopoldS on 07 Nov 09 - Cached
  • LeopoldS on 07 Nov 09
     
    new revTex version available ... what do they mean by this? how do they use XML and latex to XML? would this also be an option for acta futura? "While we appreciate the benefits to authors of preparing manuscripts in TeX, especially for math-intensive manuscripts, it is neither a cost-effective composition tool (for the volume of pages AIP currently produces) nor is it a format that can be used effectively for online publishing."
  • Francesco Biscani on 11 Nov 09
     
    Dunno really, they may have some in-house process that converts LaTeX to XML for some reason. Probably they are using some subset of SGML, the standard generalized markup language from which both HTML and XML derive. Don't think is really relevant for Acta Futura, and the rest of the world seems to get along with TeX just fine...
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Dark Matter or Black Hole Propulsion? - 1 views

www.newscientist.com/...s-for-interstellar-travel.html NRG propulsion star travel space PHY
shared by Ma Ru on 25 Nov 09 - Cached
  • Ma Ru on 25 Nov 09
     
    Anyone out there still doing propulsion stuff? Two more papers just waiting to get busted... http://arxiv.org/abs/0908.1429v1 http://arxiv.org/abs/0908.1803
  • ...5 more comments...
  • Luzi Bergamin on 26 Nov 09
     
    What an awful bunch of complete nonsense!!! But I don't think anybody wants to hear MY opinion on this...
  • pacome delva on 26 Nov 09
     
    wow, is this serious at all...!?
  • Luzi Bergamin on 26 Nov 09
     
    Are you joking?? The BH drive propses a BH with a lifetime of about an year, just 10^7 tons, peanuts!! Then you have to produce it, better not on Earth, so you do this in space, with a laser that produces an equivalent of 10^9 tons highly foucussed, even more peanuts!! Reasonable losses in the production process (probably 99,999%) are not yet taken into account. Engineering problems... :-) The DM drive is even better, they want to collect DM and compress it in a propulsion chamber. Very easy to collect and compress a gas of particles that traverse the Earth without any interaction. Perhaps if the walls of the chamber are made of artificial BHs?? Who knows??
  • LeopoldS on 26 Nov 09
     
    WRONG!!! we are all just WAITING for your opinion on this ....!!!
  • pacome delva on 27 Nov 09
     
    well, yes my remark was ironic... I'm surprised they did a magazine on these concepts...! But the press is always waiting for sensational. They do not even wait for the work to be peer-reviewed now to make an article on it ! This is one of the bad sides of arxiv in my opinion. It's like a journalist that make an article with a copy-paste in wikipedia ! Anyway, this is of course complete bullsh..., and I would have laughed if I had read this in a sci-fi book... but in a "serious" article i'm crying... For the DM i do not agree with your remark Luzi. It's not dark energy they want to use. The DM is baryonic, it's dark just because it's cold so we don't see it by usual means. If you believe the in the standard model of cosmology, then the DM should be somewhere around the galaxies. But it's of course not uniformly distributed, so a DM engine would work (if at all...) only in the periphery of galaxies. It's already impossible to get there...
  • Luzi Bergamin on 27 Nov 09
     
    One reply to Pacome, though the discussion exceeds by far the relevance of the topic already. Baryonic DM is strictly limited by cosomology, if one believes in these models, of course. Anyway, even though most DM is cold, we are constantly bombarded by some DM particles that come together with cosmic radiation, solar wind etc. etc. If DM easily interacted with normal matter, we would have found it long ago. In the paper they consider DM as neutralinos, which are neither baryonic nor strongly or electromagnetically interacting.
  • pacome delva on 27 Nov 09
     
    well then I agree, how the fu.. they want to collect them !!!
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Pioneer Anomaly Solved By 1970s Computer Graphics Technique - Technology Review - 4 views

www.technologyreview.com/...26589 pioneer anomaly PHY astrophysics
shared by Luís F. Simões on 31 Mar 11 - No Cached
Nicholas Lan liked it
  • Now Frederico Francisco at the Instituto de Plasmas e Fusao Nuclear in Lisbon Portugal, and a few pals, say they've worked out where the thermal calculations went wrong. These guys have redone the calculations using a computer model of not only how the heat is emitted but how it is reflected off the various parts of the spacecraft too. The reflections turn out to be crucial.
  • Ref: arxiv.org/abs/1103.5222: Modelling The Reflective Thermal Contribution To The Acceleration Of The Pioneer Spacecraft
  • santecarloni on 01 Apr 11
     
    This is really cool. I know one of the authors and he is a good guy... the only thing that leaves me unsatisfied is that if the whole issue is related to thermal effects one should have seen the Pioneer effect all the time and not only at about 10 AU... ...or is there some thermal process that kicked in only at this distance?
  • Luís F. Simões on 26 Jul 11
     
    Here's an update on this theory: NASA Releases New Pioneer Anomaly Analysis "The mysterious force acting on the Pioneer spacecraft seems to be falling exponentially. That's a strong clue that on-board heat is to blame, says NASA." Heat emission 'most likely cause' of pioneer anomaly "What's more interesting is that, contrary to the original analysis conducted all those years ago, the deceleration does seem to be decelerating at an exponential rate -- just as one might expect from the radioactive decay of plutonium-238, which powers the two spacecraft. Turyshev concludes, "The most likely cause of the Pioneer anomaly is the anisotropic emission of on-board heat.""
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