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santecarloni

Microscope probes living cells at the nanoscale - physicsworld.com - 1 views

physicsworld.com/...47866

microscope BIO phy science

shared by santecarloni on 29 Nov 11 - No Cached
  • santecarloni on 29 Nov 11
     
    Researchers in the US and UK say they have invented a new microscopy technique for imaging live tissue with unprecedented speed and resolution. The technique involves using the tiny tip of an atomic force microscope to tap on a living cell and analysing the resulting vibrations to reveal the mechanical properties of cell tissue. The team says that the technique could have widespread applications in medicine. However, another expert in the field suggests that the group has not demonstrated the superiority of the technique to those already available.
santecarloni

New Kind of Metal in the Earth | Geophysical Laboratory - 0 views

www.gl.ciw.edu/...new-kind-metal-earth

phy space

shared by santecarloni on 21 Dec 11 - No Cached
  • santecarloni on 21 Dec 11
     
    New experiments and supercomputer computations discovered that iron oxide undergoes a new kind of transition under deep Earth conditions. Iron oxide, FeO, is a component of the second most abundant mineral at Earth's lower mantle, ferropericlase. The finding, published in an upcoming issue of Physical Review Letters, could alter our understanding of deep Earth dynamics and the behavior of the protective magnetic field, which shields our planet from harmful cosmic rays.
Tobias Seidl

Frontiers | Alternatives to Peer Review: Novel Approaches for Research Evaluation | Fro... - 6 views

www.frontiersin.org/...full

peer review research Science

shared by Tobias Seidl on 19 Jan 12 - No Cached
  • Tobias Seidl on 19 Jan 12
     
    Some new field of game for the ACT?
  • LeopoldS on 20 Jan 12
     
    Very interesting paper!
santecarloni

Rydberg atom simulates Trojan asteroids - physicsworld.com - 3 views

physicsworld.com/...48489

atom trojan asteroids phy Space

shared by santecarloni on 02 Feb 12 - No Cached
  • santecarloni on 02 Feb 12
     
    The atom may not be a planetary system, but under specific circumstances it can behave like one. That is the curious finding of physicists in Austria and the US, who have confirmed a 1994 prediction that, in the presence of an applied electromagnetic field, electrons in very highly energized atomic states should behave like the Trojan asteroids of Jupiter.
  • LeopoldS on 05 Feb 12
     
    Bohr's model finally not so wrong?
Tom Gheysens

Cheap battery stores energy for a rainy day : Nature News & Comment - 0 views

www.nature.com/...energy-for-a-rainy-day-1.14486

energy battery science phy nature

shared by Tom Gheysens on 16 Jan 14 - No Cached
  • Tom Gheysens on 16 Jan 14
     
    Thijs interested? quinones are my field
  • Thijs Versloot on 20 Jan 14
     
    I think the major benefit of this system is the low cost of the products involved compared to standard flow batteries. However, two issues still remain, corrosion and size. I think these things need to be big right due to the volumetric storage using quinones? Nevertheless, it is interesting to see where this development will lead to. "The system is far from perfect, however: bromine and hydrobromic acid are corrosive, and could cause serious pollution if they leaked. "The bromine is, right now, the Achilles heel of this particular battery," Aziz says. The answer could be to go completely organic, he adds: "We are working on replacing the bromine with a different quinone." Are there quinones which would not be corrosive but retain good volumetric performance?
Marcus Maertens

Physicists create synthetic magnetic monopole predicted more than 80 years ago - 1 views

phys.org/...c-magnetic-monopole-years.html

PHY

shared by Marcus Maertens on 30 Jan 14 - No Cached
  • Marcus Maertens on 30 Jan 14
     
    Hall's team adopted an innovative approach to investigating Dirac's theory, creating and identifying synthetic magnetic monopoles in an artificial magnetic field generated by a Bose-Einstein condensate, an extremely cold atomic gas tens of billionths of a degree warmer than absolute zero.
LeopoldS

An optical lattice clock with accuracy and stability at the 10-18 level : Nature : Natu... - 0 views

www.nature.com/...nature12941.html

physics clock PHY

shared by LeopoldS on 23 Jan 14 - No Cached
  • LeopoldS on 23 Jan 14
     
    Progress in atomic, optical and quantum science1, 2 has led to rapid improvements in atomic clocks. At the same time, atomic clock research has helped to advance the frontiers of science, affecting both fundamental and applied research. The ability to control quantum states of individual atoms and photons is central to quantum information science and precision measurement, and optical clocks based on single ions have achieved the lowest systematic uncertainty of any frequency standard3, 4, 5. Although many-atom lattice clocks have shown advantages in measurement precision over trapped-ion clocks6, 7, their accuracy has remained 16 times worse8, 9, 10. Here we demonstrate a many-atom system that achieves an accuracy of 6.4 × 10−18, which is not only better than a single-ion-based clock, but also reduces the required measurement time by two orders of magnitude. By systematically evaluating all known sources of uncertainty, including in situ monitoring of the blackbody radiation environment, we improve the accuracy of optical lattice clocks by a factor of 22. This single clock has simultaneously achieved the best known performance in the key characteristics necessary for consideration as a primary standard-stability and accuracy. More stable and accurate atomic clocks will benefit a wide range of fields, such as the realization and distribution of SI units11, the search for time variation of fundamental constants12, clock-based geodesy13 and other precision tests of the fundamental laws of nature. This work also connects to the development of quantum sensors and many-body quantum state engineering14 (such as spin squeezing) to advance measurement precision beyond the standard quantum limit.
Thijs Versloot

The big data brain drain - 3 views

jakevdp.github.io/...big-data-brain-drain

big data

shared by Thijs Versloot on 04 Mar 14 - No Cached
  • Thijs Versloot on 04 Mar 14
     
    Echoing this, in 2009 Google researchers Alon Halevy, Peter Norvig, and Fernando Pereira penned an article under the title The Unreasonable Effectiveness of Data. In it, they describe the surprising insight that given enough data, often the choice of mathematical model stops being as important - that particularly for their task of automated language translation, "simple models and a lot of data trump more elaborate models based on less data." If we make the leap and assume that this insight can be at least partially extended to fields beyond natural language processing, what we can expect is a situation in which domain knowledge is increasingly trumped by "mere" data-mining skills. I would argue that this prediction has already begun to pan-out: in a wide array of academic fields, the ability to effectively process data is superseding other more classical modes of research.
Isabelle Dicaire

Measuring height by connecting clocks - 2 views

www.sciencedaily.com/...131002103036.htm

shared by Isabelle Dicaire on 06 Oct 13 - No Cached
annaheffernan liked it
  • Isabelle Dicaire on 06 Oct 13
     
    They were able to compare the ticking rates of two optical clocks separated by 2000 km, with the objective of computing sea level based on the effect gravity has on the clock ticking rate. They did the experiment using glass optical fibers, but I wonder if we could one day do the same from orbit, to measure the gravitational field around Earth.
  • Nicholas Lan on 09 Oct 13
     
    isn't this is effectively what pacome has been doing with his time for the last few years? e.g. http://arxiv.org/pdf/1308.6766v1.pdf also mentioning the ACES experiment
tvinko

Massively collaborative mathematics : Article : Nature - 28 views

www.nature.com/...461879a.html

INF collaboration p2p

shared by tvinko on 13 Nov 09 - Cached
  • tvinko on 13 Nov 09
     
    peer-to-peer theorem-proving
  • ...14 more comments...
  • Francesco Biscani on 13 Nov 09
     
    Or: mathematicians catch up with open-source software developers :)
  • Francesco Biscani on 13 Nov 09
     
    "Similar open-source techniques could be applied in fields such as [...] computer science, where the raw materials are informational and can be freely shared online." ... or we could reach the point, unthinkable only few years ago, of being able to exchange text messages in almost real time! OMG, think of the possibilities! Seriously, does the author even browse the internet?
  • Joris _ on 14 Nov 09
     
    I do not agree with you F., you are citing out of context! Sharing messages does not make a collaboration, nor does a forum, .... You need a set of rules and a common objective. This is clearly observable in "some team", where these rules are lacking, making team work inexistent. The additional difficulties here are that it involves people that are almost strangers to each other, and the immateriality of the project. The support they are using (web, wiki) is only secondary. What they achieved is remarkable, disregarding the subject!
  • Francesco Biscani on 14 Nov 09
     
    I think we will just have to agree to disagree then :) Open source developers have been organizing themselves with emails since the early '90s, and most projects (e.g., the Linux kernel) still do not use anything else today. The Linux kernel mailing list gets around 400 messages per day, and they are managing just fine to scale as the number of contributors increases. I agree that what they achieved is remarkable, but it is more for "what" they achieved than "how". What they did does not remotely qualify as "massively" collaborative: again, many open source projects are managed collaboratively by thousands of people, and many of them are in the multi-million lines of code range. My personal opinion of why in the scientific world these open models are having so many difficulties is that the scientific community today is (globally, of course there are many exceptions) a closed, mostly conservative circle of people who are scared of changes. There is also the fact that the barrier of entry in a scientific community is very high, but I think that this should merely scale down the number of people involved and not change the community "qualitatively". I do not think that many research activities are so much more difficult than, e.g., writing an O(1) scheduler for an Operating System or writing a new balancing tree algorithm for efficiently storing files on a filesystem. Then there is the whole issue of scientific publishing, which, in its current form, is nothing more than a racket. No wonder traditional journals are scared to death by these open-science movements.
  • LeopoldS on 15 Nov 09
     
    here we go ... nice controversy! but maybe too many things mixed up together - open science journals vs traditional journals, conservatism of science community wrt programmers (to me one of the reasons for this might be the average age of both groups, which is probably more than 10 years apart ...) and then using emailing wrt other collaboration tools .... .... will have to look at the paper now more carefully ... (I am surprised to see no comment from José or Marek here :-)
  • Joris _ on 15 Nov 09
     
    My point about your initial comment is that it is simplistic to infer that emails imply collaborative work. You actually use the word "organize", what does it mean indeed. In the case of Linux, what makes the project work is the rules they set and the management style (hierachy, meritocracy, review). Mailing is just a coordination mean. In collaborations and team work, it is about rules, not only about the technology you use to potentially collaborate. Otherwise, all projects would be successful, and we would noy learn management at school! They did not write they managed the colloboration exclusively because of wikipedia and emails (or other 2.0 technology)! You are missing the part that makes it successful and remarkable as a project. On his blog the guy put a list of 12 rules for this project. None are related to emails, wikipedia, forums ... because that would be lame and your comment would make sense. Following your argumentation, the tools would be sufficient for collaboration. In the ACT, we have plenty of tools, but no team work. QED
  • LeopoldS on 15 Nov 09
     
    the question on the ACT team work is one that is coming back continuously and it always so far has boiled down to the question of how much there need and should be a team project to which everybody inthe team contributes in his / her way or how much we should leave smaller, flexible teams within the team form and progress, more following a bottom-up initiative than imposing one from top-down. At this very moment, there are at least 4 to 5 teams with their own tools and mechanisms which are active and operating within the team. - but hey, if there is a real will for one larger project of the team to which all or most members want to contribute, lets go for it .... but in my view, it should be on a convince rather than oblige basis ...
  • Dario Izzo on 15 Nov 09
     
    It is, though, indicative that some of the team member do not see all the collaboration and team work happening around them. We always leave the small and agile sub-teams to form and organize themselves spontaneously, but clearly this method leaves out some people (be it for their own personal attitude or be it for pure chance) For those cases which we could think to provide the possibility to participate in an alternative, more structured, team work where we actually manage the hierachy, meritocracy and perform the project review (to use Joris words).
  • Joris _ on 15 Nov 09
     
    I am, and was, involved in "collaboration" but I can say from experience that we are mostly a sum of individuals. In the end, it is always one or two individuals doing the job, and other waiting. Sometimes even, some people don't do what they are supposed to do, so nothing happens ... this could not be defined as team work. Don't get me wrong, this is the dynamic of the team and I am OK with it ... in the end it is less work for me :) team = 3 members or more. I am personally not looking for a 15 member team work, and it is not what I meant. Anyway, this is not exactly the subject of the paper.
  • tvinko on 15 Nov 09
     
    My opinion about this is that a research team, like the ACT, is a group of _people_ and not only brains. What I mean is that people have feelings, hate, anger, envy, sympathy, love, etc about the others. Unfortunately(?), this could lead to situations, where, in theory, a group of brains could work together, but not the same group of people. As far as I am concerned, this happened many times during my ACT period. And this is happening now with me in Delft, where I have the chance to be in an even more international group than the ACT. I do efficient collaborations with those people who are "close" to me not only in scientific interest, but also in some private sense. And I have people around me who have interesting topics and they might need my help and knowledge, but somehow, it just does not work. Simply lack of sympathy. You know what I mean, don't you? About the article: there is nothing new, indeed. However, why it worked: only brains and not the people worked together on a very specific problem. Plus maybe they were motivated by the idea of e-collaboration. No revolution.
  • Francesco Biscani on 15 Nov 09
     
    Joris, maybe I made myself not clear enough, but my point was only tangentially related to the tools. Indeed, it is the original article mention of "development of new online tools" which prompted my reply about emails. Let me try to say it more clearly: my point is that what they accomplished is nothing new methodologically (i.e., online collaboration of a loosely knit group of people), it is something that has been done countless times before. Do you think that now that it is mathematicians who are doing it makes it somehow special or different? Personally, I don't. You should come over to some mailing lists of mathematical open-source software (e.g., SAGE, Pari, ...), there's plenty of online collaborative research going on there :) I also disagree that, as you say, "in the case of Linux, what makes the project work is the rules they set and the management style (hierachy, meritocracy, review)". First of all I think the main engine of any collaboration like this is the objective, i.e., wanting to get something done. Rules emerge from self-organization later on, and they may be completely different from project to project, ranging from almost anarchy to BDFL (benevolent dictator for life) style. Given this kind of variety that can be observed in open-source projects today, I am very skeptical that any kind of management rule can be said to be universal (and I am pretty sure that the overwhelming majority of project organizers never went to any "management school"). Then there is the social aspect that Tamas mentions above. From my personal experience, communities that put technical merit above everything else tend to remain very small and generally become irrelevant. The ability to work and collaborate with others is the main asset the a participant of a community can bring. I've seen many times on the Linux kernel mailing list contributions deemed "technically superior" being disregarded and not considered for inclusion in the kernel because it was clear that
  • pacome delva on 18 Nov 09
     
    hey, just catched up the discussion. For me what is very new is mainly the framework where this collaborative (open) work is applied. I haven't seen this kind of working openly in any other field of academic research (except for the Boinc type project which are very different, because relying on non specialists for the work to be done). This raise several problems, and mainly the one of the credit, which has not really been solved as I read in the wiki (is an article is written, who writes it, what are the names on the paper). They chose to refer to the project, and not to the individual researchers, as a temporary solution... It is not so surprising for me that this type of work has been first done in the domain of mathematics. Perhaps I have an ideal view of this community but it seems that the result obtained is more important than who obtained it... In many areas of research this is not the case, and one reason is how the research is financed. To obtain money you need to have (scientific) credit, and to have credit you need to have papers with your name on it... so this model of research does not fit in my opinion with the way research is governed. Anyway we had a discussion on the Ariadnet on how to use it, and one idea was to do this kind of collaborative research; idea that was quickly abandoned...
  • Francesco Biscani on 18 Nov 09
     
    I don't really see much the problem with giving credit. It is not the first time a group of researchers collectively take credit for a result under a group umbrella, e.g., see Nicolas Bourbaki: http://en.wikipedia.org/wiki/Bourbaki Again, if the research process is completely transparent and publicly accessible there's no way to fake contributions or to give undue credit, and one could cite without problems a group paper in his/her CV, research grant application, etc.
  • pacome delva on 18 Nov 09
     
    Well my point was more that it could be a problem with how the actual system works. Let say you want a grant or a position, then the jury will count the number of papers with you as a first author, and the other papers (at least in France)... and look at the impact factor of these journals. Then you would have to set up a rule for classifying the authors (endless and pointless discussions), and give an impact factor to the group...?
  • tvinko on 18 Nov 09
     
    it seems that i should visit you guys at estec... :-)
  • LeopoldS on 18 Nov 09
     
    urgently!! btw: we will have the ACT christmas dinner on the 9th in the evening ... are you coming?
Thijs Versloot

Magnetic bubble may give space probes a soft landing - 4 views

www.newscientist.com/article/mg22329763.100-magnetic-bubble-may-give-space-probes-a-soft-landing.html?cmpid=RSS|NSNS|2012-GLOBAL|physics-math#.U7aeTnWSzmE

magnetoshell aerocapture plasma entry

shared by Thijs Versloot on 04 Jul 14 - No Cached
  • Thijs Versloot on 04 Jul 14
     
    I am also looking into this idea since some time and it seems NASA is already ahead, awarding two contract to investigate magnetoshell aerocapture. This could be interesting for probes that want to enter eg Marsian atmospheres at relatively high velocity. Or for multiple re-entry s/c at Earth. The idea of the experiment, The satellite will carry a copper coil, powered by a lithium-ion battery, that generates a magnetic field around the probe. As it descends, the spacecraft will eject a small amount of plasma. This gets trapped in the magnetic field, creating a protective bubble that stops air molecules colliding with the craft and producing heat.
  • LeopoldS on 05 Jul 14
     
    A few years back Mimmo has worked on this, rather from the theory side if I remember well ...
  • Paul N on 11 Jul 14
     
    The power requirements for such a thing must be HUGE!
Thijs Versloot

Electromagnetism generated by symmetry breaking in dielectrics - 0 views

phys.org/...tism-enable-antennas-chip.html

science technology antenna electromagnetism

shared by Thijs Versloot on 09 Apr 15 - No Cached
  • Thijs Versloot on 09 Apr 15
     
    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.
Joris _

Sonic Screwdriver Could Produce Ultrasonic Force Fields To Manipulate Objects | Popular... - 4 views

www.popsci.com/...ipulate-objects-scientists-say

technology

shared by Joris _ on 09 Dec 10 - No Cached
  • terencepf on 10 Dec 10
     
    Dear Santa...
Tobias Seidl

Protection mechanisms of the iron-plated armor of a deep-sea hydrothermal vent gastropo... - 1 views

www.pnas.org/...987.abstract

BIO material impact

shared by Tobias Seidl on 20 Jan 10 - Cached
  • Tobias Seidl on 20 Jan 10
     
    Here, we report new materials and mechanical design principles of the iron-plated multilayered structure of the natural armor of Crysomallon squamiferum, a recently discovered gastropod mollusc from the Kairei Indian hydrothermal vent field, which is unlike any other known natural or synthetic engineered armor.
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.
Luís F. Simões

Lockheed Martin buys first D-Wave quantum computing system - 1 views

www.dwavesys.com/...pressreleases.html

quantum_computation

shared by Luís F. Simões on 26 May 11 - No Cached
  • D-Wave develops computing systems that leverage the physics of quantum mechanics in order to address problems that are hard for traditional methods to solve in a cost-effective amount of time. Examples of such problems include software verification and validation, financial risk analysis, affinity mapping and sentiment analysis, object recognition in images, medical imaging classification, compressed sensing and bioinformatics.
  • Luís F. Simões on 26 May 11
     
    According to the company's wikipedia page, the computer costs $ 10 million. Can we then declare Quantum Computing has officially arrived?! quotes from elsewhere in the site: "first commercial quantum computing system on the market"; "our current superconducting 128-qubit processor chip is housed inside a cryogenics system within a 10 square meter shielded room" Link to the company's scientific publications. Interestingly, this company seems to have been running a BOINC project, AQUA@home, to "predict the performance of superconducting adiabatic quantum computers on a variety of hard problems arising in fields ranging from materials science to machine learning. AQUA@home uses Internet-connected computers to help design and analyze quantum computing algorithms, using Quantum Monte Carlo techniques". List of papers coming out of it.
LeopoldS

Human Brain Project - Goals - 3 views

www.humanbrainproject.eu/goals.html

AI bio technology science

shared by LeopoldS on 20 May 11 - No Cached
  • LeopoldS on 20 May 11
     
    can we contribute in any way to this - or alternatively benefit from this research already now?
  • ...4 more comments...
  • Luzi Bergamin on 20 May 11
     
    Watch out!! I read quite a lot about the contribution by EPFL (apparently coordinator) and their boss, Henry Markram. From what I read, this is not really science, but mainly a PR campaign. The main motor in this project is attracting a lot of money and the main aim to do so is promising a lot of stuff that nobody will be able to deliver. Accordingly, Markram is a very controversial person in the business...
  • Luzi Bergamin on 20 May 11
     
    Oups, sorry! Of course I meant, "the main MEAN to do so...", but the aim justifies the means. Well, that's exactly Markram's motto, I guess.
  • LeopoldS on 21 May 11
     
    interesting info indeed ... I though still think that the overall goal of this project, even if too ambitious for the time being is interesting, no?
  • Luzi Bergamin on 22 May 11
     
    It's not about interesting or not, it's about serious science or not. Also the goal of a fortune-teller is interesting, isn't it? Any description of a good science project is too ambitious, that's normal and not necessarily PR. But personally I think there is a certain limit where a science project becomes a bad SciFi thriller. This one here is a dime novel, I think. But the too ambitious is not the only point I became very doubtful. I have seen quite a number of scientists and engineers from different fields; what I read about the character and attitude of this guy just hints towards the worst case scenario. It's presumptive evidence, I know...
  • LeopoldS on 22 May 11
     
    that bad! wow ....
  • Luzi Bergamin on 22 May 11
     
    You know me, I'm the bullshitter... You remember Kurzweil and his Singularity-nonsense. In a way this was very similar. Though I think Kurzweil and Markram are very different characters (The Singularity essentially is a religion, I can't see anything like that in Markram's claims) they seem to share an important point: they are both complete nerds that apparently never spent a single thought on the limits of science (in its English meaning) in general nor of their particular research field in specific. One may find this excusable, I don't. But even then, they make claims that the nerdest nerd must know that they are completely unrealistic and thus I just have to assume that they claim their nonsense on purpose. The reason in Markram's case clearly seems to be money. But all this does not mean that these nerds cannot produce valuable results.
Tobias Seidl

WikiCFP : Call For Papers of Conferences, Workshops and Journals - 3 views

www.wikicfp.com/cfp

conferences call

shared by Tobias Seidl on 17 Jun 11 - No Cached
LeopoldS and Dario Izzo liked it
  • Tobias Seidl on 17 Jun 11
     
    This is my first post to the ACT-Diigo in 18 months! Anyways a semantic wiki which collects calls for papers on all different fields - that should have been an ACT invention. SHAME ON YOU!!!
  • LeopoldS on 19 Jun 11
     
    nice!
  • Ma Ru on 20 Jun 11
     
    Come on guys, it's out there for centuries...
ESA ACT

Magnetically responsive elastic microspheres - 0 views

scitation.aip.org/...GetabsServlet

NAN BIO technology

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    Microspheres can behave as a smart material controllable through an external magnetic field. Owing to the transparency, biocompatibility and nontoxicity of PDMS, the magnetically responsive elastic microspheres may have potential applications in drug deli
ESA ACT

Electric fields could give subs 'fish-like' sense - tech - 04 May 2007 - New Scientist ... - 0 views

www.newscientisttech.com/...-give-subs-fishlike-sense.html

BIO Sensors

shared by ESA ACT on 24 Apr 09 - No Cached
  • ESA ACT on 24 Apr 09
     
    Physicists: Can this work also outside water?
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