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jaihobah

A Brain Built From Atomic Switches Can Learn - 0 views

www.quantamagazine.org/ic-switches-can-learn-20170920

AI PHY NAN

shared by jaihobah on 21 Sep 17 - No Cached
  • jaihobah on 21 Sep 17
     
    A tiny self-organized mesh full of artificial synapses recalls its experiences and can solve simple problems. Its inventors hope it points the way to devices that match the brain's energy-efficient computing prowess.
LeopoldS

Ultra-efficient ionization of heavy atoms by intense X-ray free-electron laser pulses : Nature Photonics : Nature Publishing Group - 0 views

www.nature.com/...nphoton.2012.261.html

PHY

shared by LeopoldS on 17 Nov 12 - No Cached
  • LeopoldS on 17 Nov 12
     
    Extremely charged Xe ions by stripping off more electrons than previously thought possible ...
jcunha

ALPHA observes light spectrum of antimatter for first time - 1 views

phys.org/...alpha-spectrum-antimatter.html

ALPHA antimatter spectrum

shared by jcunha on 20 Dec 16 - No Cached
  • jcunha on 20 Dec 16
     
    The ALPHA collaboration reports the first ever measurement on the optical spectrum of an antimatter hydrogen atom. Optical transitions shown to be the same as for normal hydrogen. Paper at http://www.nature.com/nature/journal/vaap/ncurrent/full/nature21040.html#affil-auth
Alexander Wittig

MAIUS 1 - First Bose-Einstein condensate generated in space - 0 views

www.dlr.de/...year-all

shared by Alexander Wittig on 24 Jan 17 - No Cached
jcunha liked it
  • Alexander Wittig on 24 Jan 17
     
    For the first time, ultra-cold atoms interfere in space The MAIUS 1 experiment was launched on 23 January 2017 at 3:30 CET on board a sounding rocket from Esrange Space Center near Kiruna in northern Sweden. German scientists have, for the first time, succeeded in producing a Bose-Einstein condensate in space and using it for interferometry experiments.
santecarloni

Laser gyroscope measures the Earth's 'wobble' - physicsworld.com - 2 views

physicsworld.com/...47665

gyroscope laser Phy space

shared by santecarloni on 07 Nov 11 - No Cached
  • santecarloni on 07 Nov 11
     
    An international team of researchers have developed a new type of gyroscope that is the first to measure the "wobble" in the rotational axis of the Earth from a ground-based laboratory. Astronomers normally track this wobble by continuously monitoring the position of distant objects, such as quasars. But this new method will provide a much simpler and cheaper alternative to these large-scale astronomical readings, the scientists claim.
  • LeopoldS on 12 Nov 11
     
    is this of any use for spacecraft?
  • pacome delva on 15 Nov 11
     
    mmm it's like saying that you can replace satellite tracking by accelerometers on-board satellites... for Leo: you'd better put an atomic gyro on a spacecraft these laser gyro are huge !
H H

Attractive force arises from black-body radiation, say physicists - 0 views

physicsworld.com/...-body-radiation-say-physicists

shared by H H on 25 Jul 13 - No Cached
  • H H on 25 Jul 13
     
    Black-body radiation can give rise to a net attractive force between tiny objects. That is the claim made by physicists at the University of Innsbruck in Austria, who have calculated the strength of this new force between a speck of dust and a hydrogen atom. Under some cirmustances this force could be stronger than gravitation. Read the paper here: http://prl.aps.org/abstract/PRL/v111/i2/e023601
johannessimon81

Cosmological model without accelerated expansion proposed - 1 views

www.nature.com/...e-may-not-be-expanding-1.13379

science cosmology

shared by johannessimon81 on 07 Aug 13 - No Cached
  • johannessimon81 on 07 Aug 13
     
    Redshift in this model is partially produced by a change in the masses of elementary particles (and atoms)
  • ...3 more comments...
  • Thijs Versloot on 25 Aug 13
     
    It seems to solve the problem of infinite energy density at the singularity in any case. I would love to see a way of experimentally verifying this, although most people seem to believe it is wrong. I read the following quote though by Dirac to Pauli "we all agree your idea is crazy, but the real question is it crazy enough to be correct?"
  • H H on 25 Aug 13
     
    As far as I can see, this is not untestable per se, rather an explanation to the redshift that is equivalent to accelerating expansion. It is not that the theory is untestable, rather just another way of looking at it. Kind of like that its sometimes convenient to consider light a particle, sometimes a wave. In the same way it could sometime convenient to view the universe as static with increasing mass instead.
  • Thijs Versloot on 26 Aug 13
     
    Well the premiss "matter getting heavier" may be up to falsification in some way or another. Currently, there is no absolute method to determine mass so it might even be plausible that this is actually the case. I don't think it is related but there is a problem with the 1kg-standards (1 official and 6 copies) where the masses seem to deviate.
  • johannessimon81 on 26 Aug 13
     
    It should not be impossible to verify a change in mass(es) over time. For example the electron cyclotron frequency scales ~e/m while the Hydrogen emission frequencies scale with ~m*e^4. Using multiple relationships like that which can be easily and accurately measured an increase in the mass of fundamental particles should - in principle - be detectable (even if the mass of the earth increases at the same time changing the relativistic reference frame).
  • Thijs Versloot on 26 Aug 13
     
    The Watt balance and a definition using the Planck's constant seems to do the trick and is currently being discussed. Would the electron charge not be problematic as it is related to Coulombs which depends on Amperes which is defined by Newtons which hence depends back on the mass again?
johannessimon81

Physicists Succeed in Making 'Impossible' Gamma-Ray Lens - 0 views

www.wired.com/...gamma-ray-lens

technology PHY space science

shared by johannessimon81 on 22 Aug 13 - No Cached
  • johannessimon81 on 22 Aug 13
     
    High energy gamma rays are shown to be bent slightly by specialized lenses. The effect is likely due to pair-creation close to the atomic nuclei in the material.
Thijs Versloot

Existence of new element confirmed - 1 views

www.lunduniversity.lu.se/o.o.i.s

science

shared by Thijs Versloot on 28 Aug 13 - No Cached
  • Thijs Versloot on 28 Aug 13
     
    An international team of researchers, led by physicists from Lund University, have confirmed the existence of what is considered a new element with atomic number 115. The experiment was conducted at the GSI research facility in Germany. The results confirm earlier measurements performed by research groups in Russia.
Luís F. Simões

Singularity University, class of 2010: projects that aim to impact a billion people within ten years - 8 views

www.kurzweilai.net/ty-webinar-today-sneak-preview

AI robotics biomedicine biotechnology electronics energy nanotechnology singularity futures social ethics space synthetic biology computer science defence

shared by Luís F. Simões on 22 Sep 10 - No Cached
  • Luís F. Simões on 22 Sep 10
     
    At the link below you find additional information about the projects: Education: Ten weeks to save the world http://www.nature.com/news/2010/100915/full/467266a.html
  • ...8 more comments...
  • LeopoldS on 23 Sep 10
     
    this is the podcast I was listening to ...
  • Dario Izzo on 23 Sep 10
     
    We can do it in nine :)
  • LeopoldS on 24 Sep 10
     
    why wait then?
  • Juxi Leitner on 24 Sep 10
     
    hmm, wonder how easy it is to get funding for that, 25k is a bit steep for 10weeks :)
  • Dario Izzo on 26 Sep 10
     
    well, we wait for the same fundings they get and then we will do it in nine.... as we say in Rome "a mettece un cartello so bboni tutti". (italian check for Juxi)
  • LeopoldS on 26 Sep 10
     
    and what you think about the project subjects?
  • LeopoldS on 26 Sep 10
     
    I like the fact that there are quite a lot of space projects .... and these are not even bad in my view: The space project teams have developed imaginative new solutions for space and spinoffs for Earth. The AISynBio project team is working with leading NASA scientists to design bioengineered organisms that can use available resources to mitigate harsh living environments (such as lack of air, water, food, energy, atmosphere, and gravity) - on an asteroid, for example, and also on Earth . The SpaceBio Labs team plans to develop methods for doing low-cost biological research in space, such as 3D tissue engineering and protein crystallization. The Made in Space team plans to bring 3D printing to space to make space exploration cheaper, more reliable, and fail-safe ("send the bits, not the atoms"). For example, they hope to replace some of the $1 billion worth of spare parts and tools that are on the International Space Station.
  • Dario Izzo on 26 Sep 10
     
    and all in only a three months summer graduate program!! that is impressive. God I feel so stupid!!!
  • LeopoldS on 26 Sep 10
     
    well, most good ideas probably take only a second to be formulated, it's the details that take years :-)
  • Dario Izzo on 26 Sep 10
     
    I do not think the point of the SU is to formulate new ideas (infact there is nothing new in the projects chosen). Their mission is to build and maintain a network of contacts among who they believe will be the 'future leaders' of space ... very similar to our beloved ISU.
Thijs Versloot

Stimulated mutual annihilation: How to make a gamma-ray laser with positronium - 1 views

www.sciencedaily.com/...140501165654.htm

laser antimatter

shared by Thijs Versloot on 02 May 14 - No Cached
  • Thijs Versloot on 02 May 14
     
    Theorists expect that positronium, a sort of 'atom' consisting of an electron and an anti-electron, can be used to make a powerful gamma-ray laser. Scientists now report detailed calculations of the dynamics of a positronium BEC. This work is the first to account for effects of collisions between different positronium species.
Thijs Versloot

Boron 'buckyball' discovered - 1 views

phys.org/...2014-07-boron-buckyball.html

science boron nanotechnology

shared by Thijs Versloot on 15 Jul 14 - No Cached
  • Thijs Versloot on 15 Jul 14
     
    Jul 13, Nanotechnology/Nanomaterials Researchers have shown that clusters of 40 boron atoms form a molecular cage similar to the carbon buckyball. This is the first experimental evidence that such a boron cage structure exists. Credit: Wang lab / Brown UniversityThe discovery 30 years ago of soccer-ball-shaped carbon molecules called buckyballs helped to spur an explosion of nanotechnology research.
annaheffernan

Superabsorbing rings could lead to better cameras and solar cells - 2 views

physicsworld.com/...better-cameras-and-solar-cells

PHY science technology solar quantum

shared by annaheffernan on 06 Oct 14 - No Cached
  • annaheffernan on 06 Oct 14
     
    Rings of excited atoms that harness a quantum effect to absorb light at an enhanced rate could be used in future technologies such as highly sensitive cameras, solar cells and systems for optical power transmission.
johannessimon81

New Form of Carbon is Stronger Than Graphene and Diamond - 0 views

www.technologyreview.com/...nger-than-graphene-and-diamond

science technology

shared by johannessimon81 on 23 Aug 13 - No Cached
  • johannessimon81 on 23 Aug 13
     
    "Chemists have calculated that chains of double or triple-bonded carbon atoms, known as carbyne, should be stronger and stiffer than any known material."
aborgg

Electron waves refract negatively - 1 views

www.nature.com/...nphys3460.html

PHY science technology

shared by aborgg on 17 Sep 15 - No Cached
  • aborgg on 17 Sep 15
     
    Waves of electrons have been bent backward in a sheet of graphene, allowing physicists to focus electrons the way a lens focuses light. Electrons coursing through a sheet of carbon atoms exhibited negative refraction, bending at angles not seen in nature. By exploiting this unusual bending, the researchers created a lenslike device to focus the electrons to a tiny point. The new technique could help physicists learn how to manipulate electrons in the tight confines of miniaturized electronic devices, where the particles often behave like waves.
jcunha

Nature: Spawning rings of exceptional points out of Dirac cones - 3 views

www.nature.com/...nature14889.html

technology lasers QM PHY Dirac Cone

shared by jcunha on 10 Sep 15 - No Cached
LeopoldS liked it
  • jcunha on 10 Sep 15
     
    Dirac cones, a band-structure of two cones touching each other, are the key to understand graphene exceptional properties. They also appear in the theory of photon waveguides and atoms in optical lattices. In here, the study of a Dirac cone deformation in an open system (a system that is perturbed by external agents) lead to the deformation of the Dirac cone, meaning a change in the fundamental properties of the system. This change is such that strange phenomena such as unidirectional transmission or reflection or lasers with single mode (really single) operation can be achieved. Proved experimentally in photonic crystals. New way for extremely pure lasers?
pacome delva

The Coolest Antiprotons - 2 views

focus.aps.org/st1

phy antiprotons antihydrogen

shared by pacome delva on 05 Jul 10 - Cached
  • Researchers cooled a cloud of about 4,000 antiprotons down to 9 kelvin using a standard approach for cooling atoms that has never been used with charged particles or ions. The technique could provide a new way to create and trap antihydrogen, which could help researchers probe a basic symmetry of nature.
  • hydrogen and antihydrogen should share many basic traits, like mass, magnetic moment, and emission spectrum. If antihydrogen and hydrogen have even slightly different spectra, it indicates some new physics principles beyond the standard model, a very big deal.
  • pacome delva on 05 Jul 10
     
    antihydrogen propulsion...?
  • ...1 more comment...
  • LeopoldS on 05 Jul 10
     
    how to efficiently direct it?
  • Nicholas Lan on 06 Jul 10
     
    didn't roger write an assessment of antimatter propulsion when he was in the ACT?
  • pacome delva on 06 Jul 10
     
    yeah the problem is the amount of antimatter you can get and more specifically how to trap it. I found that you would need around one gram to go to the outer Solar System. So we are far from that, but finding an efficient way to trap it, with an electromagnetic trap rather than solid walls is a first step !
Ma Ru

Yet another issue to take into account when you want to travel at c - 1 views

www.newscientist.com/...lls-especially-warp-speed.html

PHY interstellar travel human spaceflight speed of light

shared by Ma Ru on 19 Feb 10 - Cached
  • Ma Ru on 19 Feb 10
     
    While my attitude to articles about interstellar travel is generally sceptical, this one seems to raise quite an interesting point... Physicists?
  • ...1 more comment...
  • pacome delva on 19 Feb 10
     
    mmm, I think that if we manage to travel at 99.999998 per cent the speed of light, we'll have the technology to deviate these atoms ! one way could be a super strong magnetic field, or a super laser that would act as an ice breaker with the radiation pressure (the good thing is that light always travel at the speed of light, even if you are at 99.999998 per cent the speed of light)
  • Francesco Biscani on 19 Feb 10
     
    Also, remember never to dereference null pointers.
  • Ma Ru on 19 Feb 10
     
    True, it's almost like installing accelerometers upside down...
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