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Ma Ru

Russian cargo rocket crashes - 1 views

edition.cnn.com/...index.html

space news crash Russia ATV

shared by Ma Ru on 24 Aug 11 - No Cached
  • Ma Ru on 24 Aug 11
     
    So... basically they are the only guys who now do human spaceflight?
  • Joris _ on 26 Aug 11
     
    and 2nd failed launch for Russian in 10 days. http://www.nasaspaceflight.com/2011/08/proton-m-launches-russias-ekspress-am4-communications-satellite/ although this one is a giant space debris stuck on the GTO.
  • Ma Ru on 01 Sep 11
     
    ESA's article on the consequences for ISS: http://www.esa.int/esaCP/SEM6GJUTTRG_index_0.html What is not clear is if the rocket that failed is the same variant as used in manned missions. [Edit] According to this article: http://www.interfax.com/newsinf.asp?pg=3&id=268437 "The first and second stages of the Soyuz-FG space rocket used for manned launches differ from those of the Soyuz-U, but the third stage [the one that failed - MR] is identical in both rockets". Thus the stay of astronauts currently at ISS may prolong a little bit.
LeopoldS

[0812.2633] Ghost imaging with a single detector - 2 views

arxiv.org/0812.2633

PHY NAN

shared by LeopoldS on 20 Sep 11 - No Cached
  • LeopoldS on 20 Sep 11
     
    anything happening on this since 3 years?
  • pacome delva on 28 Sep 11
     
    yes it seems like. most of it seems however directed toward understanding this effect, and not toward applications. But i'm still convinced that we could find many very interesting applications !!! a few references from ADS: 1 2011PhRvA..83f3807B 1.000 06/2011 A E X R C U Brida, G.; Chekhova, M. V.; Fornaro, G. A.; Genovese, M.; Lopaeva, E. D.; Berchera, I. Ruo Systematic analysis of signal-to-noise ratio in bipartite ghost imaging with classical and quantum light 2 2011PhRvA..83e3808L 1.000 05/2011 A E R U Liu, Ying-Chuan; Kuang, Le-Man Theoretical scheme of thermal-light many-ghost imaging by Nth-order intensity correlation 3 2011PhRvA..83e1803D 1.000 05/2011 A E R C U Dixon, P. Ben; Howland, Gregory A.; Chan, Kam Wai Clifford; O'Sullivan-Hale, Colin; Rodenburg, Brandon; Hardy, Nicholas D.; Shapiro, Jeffrey H.; Simon, D. S.; Sergienko, A. V.; Boyd, R. W.; Howell, John C. Quantum ghost imaging through turbulence 4 2011SPIE.7961E.160O 1.000 03/2011 A E T Ohuchi, H.; Kondo, Y. Complete erasing of ghost images caused by deeply trapped electrons on computed radiography plates 5 2011ApPhL..98k1115M 1.000 03/2011 A E R U Meyers, Ronald E.; Deacon, Keith S.; Shih, Yanhua Turbulence-free ghost imaging 6 2011ApPhL..98k1102G 1.000 03/2011 A E R C U Gan, Shu; Zhang, Su-Heng; Zhao, Ting; Xiong, Jun; Zhang, Xiangdong; Wang, Kaige Cloaking of a phase object in ghost imaging 7 2011RScI...82b3110Y 1.000 02/2011 A E R U Yang, Hao; Zhao, Baosheng; Qiu
Juxi Leitner

Real-Life Cyborg Astrobiologists to Search for Signs of Life on Future Mars Missions - 0 views

www.dailygalaxy.com/...e-on-future-mars-missions.html

technology novelty detection inf science

shared by Juxi Leitner on 03 Nov 09 - Cached
LeopoldS liked it
  • EuroGeo team developed a wearable-computer platform for testing computer-vision exploration algorithms in real-time at geological or astrobiological field sites, focusing on the concept of "uncommon mapping"  in order to identify contrasting areas in an image of a planetary surface. Recently, the system was made more ergonomic and easy to use by porting the system into a phone-cam platform connected to a remote server.
  • a second computer-vision exploration algorithm using a  neural network in order to remember aspects of previous images and to perform novelty detection
  • Juxi Leitner on 03 Nov 09
     
    well a bit misleading title...
pacome delva

Physics - Atoms in a lattice keep time - 0 views

physics.aps.org/...PhysRevLett.103.063001

phy metrology atomic_clocks atom_interferometry

shared by pacome delva on 05 Aug 09 - Cached
  • If your wristwatch was as accurate as today’s atomic clocks, it would not gain or lose a second in 80 million years.
  • The NIST group traps and cools neutral 171Yb atoms and loads them into a one-dimensional lattice, so that about 30,000 atoms fill several hundred lattice sites.
  • Lemke et al. compare their optical lattice clock with the current standard atomic fountain clock and find that the accuracy of the Yb lattice clock potentially challenges the current standard.
Joris _

Physicists Propose Scheme for Teleporting Light Beams - 0 views

www.physorg.com/news166779852.html

PHY

shared by Joris _ on 15 Jul 09 - Cached
  • it’s possible that a physical object (e.g. a quantum field) in one location could emerge at another location in the same quantum state
  • pacome delva on 16 Jul 09
     
    have to be carefull this article is really badly written. Teleportation is not some matter that disapear from somewhere to reappear somewhere else... Usually we talk about entangled particles (by essence quantum theory is non-local), and teleportation means that if you force (with a measurement) one particle to take a particular quantum state then the other one will have the same quantum state. There it seems that the same could be done with a quantum field, which is the second quantization of the quantum theory: the state of a quantum field can contain a mixture of n-particles states (meaning that the number of particles is not defined, only the mean value). If you measure the number of particle then you force the quantum field to "choose" a particular quantum state (which can be the vacuum). Teleportation means that you will have exactly the same measure on another quantum field, which is somehow intricated to your first one.
Francesco Biscani

Saturn's moon Enceladus spews clues on habitability: Scientific American Blog - 0 views

www.scientificamerican.com/...post.cfm

bio astronomy

shared by Francesco Biscani on 25 Jun 09 - Cached
pacome delva liked it
  • Francesco Biscani on 25 Jun 09
     
    More amazing stuff from Saturn.
  • pacome delva on 25 Jun 09
     
    Europe is less far and there is also an ocean beneath the surface (at least we think...), and it's bigger. Nasa planned a mission to Europe some years ago but it was cancelled because of budget cut because of... war in Irak !
Luís F. Simões

Following SpaceX down the rabbit hole -- The Space Review - 4 views

www.thespacereview.com/...1

SpaceX launcher

shared by Luís F. Simões on 19 Apr 11 - No Cached
  • He then went on to remind the press that his company’s goal is to continue to lower the cost of access to space because high launch costs were “the fundamental factor preventing humanity from becoming a spacefaring civilization.”
  • First, two Falcon Heavy launches could field a return to the Moon
  • Second, a single Falcon Heavy could launch a Mars sample return mission.
  • ...3 more annotations...
  • Also possible with a single launch: a first ever human mission to an asteroid.
  • what effect Falcon Heavy might have on the costs of supporting the International Space Station. The ability to launch twice the supply capacity provided by the shuttle at something on the order of 20 percent of the cost changes the calculus entirely. So much so in fact, it opens the door for contemplating an entirely different future for ISS in which it never follows Mir into the Pacific.
  • Following conclusions offered by the Augustine Committee, the Obama Administration cancelled Project Constellation as unaffordable under existing budget limits, and supported instead the ambling, but cost-contained “flexible path.” If the Falcon Heavy is available, however, the rationale for selecting the flexible path—because it’s the only thing we can afford—simply doesn’t exist.
  • Luís F. Simões on 19 Apr 11
     
    an analysis of implications of the Falcon Heavy announcement
LeopoldS

Asian Journal of Andrology - Second to fourth digit ratio: a predictor of adult penile length - 1 views

www.nature.com/...aja201175a.html

bio fun

shared by LeopoldS on 04 Jul 11 - No Cached
  • LeopoldS on 04 Jul 11
     
    enjoy measuring ...
  • LeopoldS on 06 Jul 11
     
    nobody viewing this paper ... strange ...
dejanpetkow

Bioengineering to generate healthy skin - 1 views

www.sciencedaily.com/...111017075511.htm

skin BIO science

shared by dejanpetkow on 18 Oct 11 - No Cached
  • That is, using a small biopsy from a specific patient, they can generate almost the entire cutaneous surface of that individual in the lab.
  • that it is possible to isolate epidermic stem cells from patients with different genetic skin diseases, cultivate them and, using molecular engineering as a first step, incorporate the therapeutic genes into each patient's genome to take the place of the one that the patient does not have or that functions abnormally. Afterwards, in the second step, the stem cells would be assembled into patches ready to be transplanted onto the patients.
  • "What we did in this case -- explains Marcela del Río -- was to transfer a normal SPINK-5 gene to a patient's stem cells and later use these cells to generate skin that could be transplanted to experimental models, such as mice."
  • dejanpetkow on 18 Oct 11
     
    Nice approach to generate healthy skin and to patch parts or to replace the overall human skin. Next step - clinical studies.
Lionel Jacques

The end of GMT ? - 3 views

www.theregister.co.uk/...atomic_time_could_replace_gmt

technology science

shared by Lionel Jacques on 04 Nov 11 - No Cached
pacome delva liked it
  • Lionel Jacques on 04 Nov 11
     
    Greenwich could lose its place at the centre of global time if a move to "atomic time" is voted in by the International Telecommunication Union in Geneva in January 2012.
  • ...1 more comment...
  • Ma Ru on 04 Nov 11
     
    The article says it can lead to abandoning the Daylight Wasting Time in winter, so if that's the case, I'm definitely for.
  • pacome delva on 07 Nov 11
     
    Haha this is really a British article... Already since 1972 we don't use GMT but UTC, which is based on atomic clocks. However British continue to call it GMT... The question is to drop the leap second in UTC, and France is definitely for this change (for scientific motives of course...;) I don't see how this is connected to winter time however... And they shouldn't worry Greenwich is still the beginning of the world with 0 degree longitude !
  • Ma Ru on 07 Nov 11
     
    "the end of GMT as an international standard could accelerate the move to keep British Summer Time into the winter, letting us have lighter evenings." As I understand it, if GMT looses its "prestigious" status, then it would be easier to push through all-year BST in UK.
LeopoldS

Finally, a New Clue to Solve the CIA's Mysterious Kryptos Sculpture | WIRED - 2 views

www.wired.com/...second-kryptos-clue

shared by LeopoldS on 21 Nov 14 - No Cached
  • LeopoldS on 21 Nov 14
     
    anybody wanna try? surprising to me
anonymous

Nasa validates 'impossible' space drive (Wired UK) - 3 views

www.wired.co.uk/...lidates-impossible-space-drive

PHY space nasa propulsion emdrive

shared by anonymous on 31 Jul 14 - No Cached
  • anonymous on 31 Jul 14
     
    NASA validates the EmDrive (http://emdrive.com/) technology for converting electrical energy into thrust. (from the website: "Thrust is produced by the amplification of the radiation pressure of an electromagnetic wave propagated through a resonant waveguide assembly.")
  • ...3 more comments...
  • LeopoldS on 01 Aug 14
     
    I would be very very skeptic on this results and am actually ready to take bets that they are victims of something else than "new physics" ... some measurement error e.g.
  • anonymous on 02 Aug 14
     
    Assuming that this system is feasible, and taking the results of Chinese team (Thrust of 720 mN http://www.wired.co.uk/news/archive/2013-02/06/emdrive-and-cold-fusion), I wonder whether this would allow for some actual trajectory maneuvers (and to which degree). If so, can we simulate some possible trajectories, e.g. compare the current solutions to this one ? For example, Shawyer (original author) claims that this system would be capable of stabilizing ISS without need for refueling. Other article on the same topic: http://www.theverge.com/2014/8/1/5959637/nasa-cannae-drive-tests-have-promising-results
  • Thijs Versloot on 04 Aug 14
     
    To be exact, the chinese reported 720mN and the americans found ~50microN. The first one I simply do not believe and the second one seems more credible, yet it has to be said that measuring such low thrust levels on a thrust-stand is very difficult and prone to measurement errors. @Krzys, the thrust level of 720mN is within the same range of other electric propulsion systems which are considered - and even used in some cases - for station keeping, also for the ISS actually (for which there are also ideas to use a high power system delivering several Newtons of thrust). Then on the idea, I do not rule out that an interaction between the EM waves and 'vacuum' could be possible, however if this would be true then this surely would be detectable in any particle accelerator as it would produce background events/noise. The energy densities involved and the conversion to thrust via some form of interaction with the vacuum surely could not provide thrusts in the range reported by the chinese, nor the americans. The laws of momentum conservation would still need to apply. Finally, 'quantum vacuum virtual plasma'.. really?
  • annaheffernan on 04 Aug 14
     
    I have to join the skeptics on this one ...
  • Marcus Maertens on 09 Aug 14
benjaminroussel

The problems with forcing regular password expiry - NCSC Site - 2 views

www.ncsc.gov.uk/...orcing-regular-password-expiry

security

shared by benjaminroussel on 29 Jan 19 - No Cached
  • benjaminroussel on 29 Jan 19
     
    Not new, but always good to read: British intelligence recommend not having password expiry dates. Something we should apply at ESA!
  • Marcus Maertens on 30 Jan 19
     
    I second that. It has been an open secret for long though that frequent password changes are creating more problems than they solve. See Bruce Schneier: https://www.schneier.com/blog/archives/2016/08/frequent_passwo.html
jaihobah

Scientists plan huge European AI hub to compete with US - 1 views

www.theguardian.com/...pean-ai-hub-to-compete-with-us

AI

shared by jaihobah on 26 Apr 18 - No Cached
  • jaihobah on 26 Apr 18
     
    "Leading scientists have drawn up plans for a vast multinational European institute devoted to world-class artificial intelligence (AI) research in a desperate bid to nurture and retain top talent in Europe. The new institute would be set up for similar reasons as Cern, the particle physics lab near Geneva, which was created after the second world war to rebuild European physics and reverse the brain drain of the brightest and best scientists to the US."
Alexander Wittig

Calling Bullshit - 2 views

callingbullshit.org/index.html

science

shared by Alexander Wittig on 27 Feb 17 - No Cached
LeopoldS and jcunha liked it
  • Alexander Wittig on 27 Feb 17
     
    A college course at University of Washington on "Calling Bullshit". We should invite them to give a lunch lecture at ESA... Our aim in this course is to teach you how to think critically about the data and models that constitute evidence in the social and natural sciences. While bullshit may reach its apogee in the political domain, this is not a course on political bullshit. Instead, we will focus on bullshit that comes clad in the trappings of scholarly discourse. Our learning objectives are straightforward. After taking the course, you should be able to: * Remain vigilant for bullshit contaminating your information diet. * Recognize said bullshit whenever and wherever you encounter it. * Figure out for yourself precisely why a particular bit of bullshit is bullshit. * Provide a statistician or fellow scientist with a technical explanation of why a claim is bullshit. * Provide your crystals-and-homeopathy aunt or casually racist uncle with an accessible and persuasive explanation of why a claim is bullshit. We will be astonished if these skills do not turn out to be among the most useful and most broadly applicable of those that you acquire during the course of your college education.
  • LeopoldS on 01 Mar 17
     
    love it: "Politicians are unconstrained by facts. Science is conducted by press release. Higher education rewards bullshit over analytic thought. Startup culture elevates bullshit to high art. Advertisers wink conspiratorially and invite us to join them in seeing through all the bullshit - and take advantage of our lowered guard to bombard us with bullshit of the second order. The majority of administrative activity, whether in private business or the public sphere, seems to be little more than a sophisticated exercise in the combinatorial reassembly of bullshit. We're sick of it. It's time to do something, and as educators, one constructive thing we know how to do is to teach people. So, the aim of this course is to help students navigate the bullshit-rich modern environment by identifying bullshit, seeing through it, and combating it with effective analysis and argument."
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