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Luís F. Simões

Alice and Bob in Cipherspace » American Scientist - 1 views

www.americanscientist.org/...issue.aspx

INF cryptography

shared by Luís F. Simões on 11 Sep 12 - No Cached
  • A new form of encryption allows you to compute with data you cannot read
  • The technique that makes this magic trick possible is called fully homomorphic encryption, or FHE. It’s not exactly a new idea, but for many years it was viewed as a fantasy that would never come true. That changed in 2009, with a breakthrough discovery by Craig Gentry, who was then a graduate student at Stanford University. (He is now at IBM Research.) Since then, further refinements and more new ideas have been coming at a rapid pace.
Tom Gheysens

Discovery of a kernel for controlling biomolecular regulatory networks : Scientific Rep... - 1 views

www.nature.com/...srep02223.html

shared by Tom Gheysens on 25 Jul 13 - No Cached
  • Tom Gheysens on 25 Jul 13
     
    What synthetic biology can offer to AI... 
johannessimon81

New discovery of unknown lifeforms underneath ice in Antarctica - 1 views

www.mdpi.com/680

BIO science

shared by johannessimon81 on 11 Sep 13 - No Cached
  • johannessimon81 on 11 Sep 13
     
    2nd find within a year of unknown lifeforms. 23% unknown DNA.
johannessimon81

Astronomers Uncover a 'Transformer' Pulsar: switching between X-ray and Radio - 0 views

www.nasa.gov/...s-uncover-a-transformer-pulsar

space science

shared by johannessimon81 on 26 Sep 13 - No Cached
  • johannessimon81 on 26 Sep 13
     
    In a feat never before observed, a newly discovered pulsar shifts back and forth between emitting X-rays and radio waves. The discovery represents a long-sought "middle" phase in the life of these powerful objects.
johannessimon81

Weather patterns on Exoplanet detected - 1 views

news.discovery.com/...chance-of-maelstrom-131001.htm

space science

shared by johannessimon81 on 02 Oct 13 - No Cached
  • Thijs Versloot on 02 Oct 13
     
    so it took us 70% of the time Earth is in the habitable zone to develop, would this be normal or could it be much faster? In other words, would all forms of life that started on a planet that originated at a 'similar' point in time like us, be equally far developed?
  • Paul N on 24 Oct 13
     
    That is actually quite tricky to estimate rly. If for no other reason than the fact that all of the mass extinctions we had over the Earth's history basically reset the evolutionary clock. Assuming 2 Earths identical in every way but one did not have the dinosaur wipe-out impact, that would've given non-impact Earth 60million years to evolve a potential dinosaur intelligent super race.
  • johannessimon81 on 25 Oct 13
     
    The opposite might be true - or might not be ;-). Since usually the rate of evolution increases after major extinction events the chance is higher to produce 'intelligent' organisms if these events happen quite frequently. Usually the time of rapid evolution is only a few million years - so Earth is going quite slow. Certainly extinction events don't reset the evolutionary clock - if they would never have happened Earth gene pool would probably be quite primitive. By the way: dinosaurs were a quite diverse group and large dinosaurs might well have had cognitive abilities that come close to whales or primates - the difference to us might be that we have hands to manipulate our environment and vocal cords to communicate in very diverse ways. Modern dinosaur (descendents), i.e. birds, contain some very intelligent species - especially with respect to their body size and weight.
Thijs Versloot

New evidence for oceans of water deep in the Earth @Science - 0 views

phys.org/...vidence-oceans-deep-earth.html

science earth water ocean crust

shared by Thijs Versloot on 13 Jun 14 - No Cached
  • Thijs Versloot on 13 Jun 14
     
    Researchers from Northwestern University and the University of New Mexico report evidence for potentially oceans worth of water deep beneath the United States. Though not in the familiar liquid form-the ingredients for water are bound up in rock deep in the Earth's mantle-the discovery may represent the planet's largest water reservoir.
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.
johannessimon81

Should We Remake Mars in Earth's Image? - 1 views

news.discovery.com/...ars-in-earths-image-131023.htm

terraforming bio space

shared by johannessimon81 on 27 Oct 13 - No Cached
LeopoldS liked it
  • LeopoldS on 27 Oct 13
     
    Strange that this article is based on the 2001 paper that furthermore was subseded by another one of the same authors from 2006 but not mentioned.
Luís F. Simões

Timelapse video of asteroid discoveries in our solar system from 1980-2010 (watch in 10... - 5 views

www.youtube.com/watch

asteroid detection solar system WISE

shared by Luís F. Simões on 13 Sep 10 - No Cached
Joris _ liked it
  • Ma Ru on 14 Sep 10
     
    Nice... Now I have a lame question: after you have discovered ~500k asteroids, all moving (I assume more or less) chaotically in that asteroid belt, how do you tell one from another?
  • ...1 more comment...
  • Joris _ on 14 Sep 10
     
    hmm, not very chaotic indeed - laws of Kepler plus some perturbations.
  • Ma Ru on 15 Sep 10
     
    That's what I thought but when presented as a green "goo" in the video, it appears rather unordered... so I guess this is just an impression evoked by a not-to-scale presentation?
  • Francesco Biscani on 19 Sep 10
     
    It depends... orbits can be chaotic if the orbital period is in a resonance with Jupiter, although such orbits are not stable. Such configurations tend to get disrupted pretty quickly (in cosmic terms :P) http://en.wikipedia.org/wiki/Kirkwood_gap
Ma Ru

"discovery of an exceptional object in our cosmic neighborhood" - 2 views

www.nasa.gov/...HQ_M10-157_Chandra_Update.html

space news science x-ray chandra

shared by Ma Ru on 14 Nov 10 - No Cached
  • Ma Ru on 14 Nov 10
     
    This enigmatic statement is said to have generated a lot of hype in the blogosphere... in case you want to watch, 12:30 EST is 17:30 GMT and 18:30 CET.
Christos Ampatzis

NASA news conference Dec. 2, on extraterrestrial life?! - 3 views

www.nasa.gov/...M10-110.html

space BIO fun

shared by Christos Ampatzis on 01 Dec 10 - No Cached
  • Christos Ampatzis on 01 Dec 10
     
    Let's start betting which party Aliens vote: GREEN, BLUE, RED, BLACK?
  • ...3 more comments...
  • Luís F. Simões on 01 Dec 10
     
    yes, the internet is going crazy over this one :) (http://cumbriansky.wordpress.com/2010/11/30/nasas-astrobiology-press-conference/) This is the most likely scenario I've seen so far for what will be announced tomorrow: http://skymania.com/wp/2010/11/alien-life-form-is-here-on-earth.html/ "...discovery of microbes in a deadly poisonous lake that get their energy from arsenic. Experts say this shows they had a completely different origin to any other creature known on our planet. It means that life began not just once but at least twice on Earth."
  • Joris _ on 02 Dec 10
     
    well, we've all seen the movie Evolution (http://www.imdb.com/title/tt0251075/) ;p ... this is exactly this scenario indeed.
  • Ma Ru on 02 Dec 10
     
    yaaawnnn... Let's wait until they actually announce it.
  • nikolas smyrlakis on 02 Dec 10
     
    http://astrobiology.nasa.gov/ for the moment is down. My bet, the microbe they found notified its cousins and they are currently invading the US
  • Luís F. Simões on 02 Dec 10
     
    you can still see the rest of it here: http://www.nasa.gov/multimedia/nasatv/index.html a good link with a summary and discussion on the announcement is here: http://www.guardian.co.uk/science/2010/dec/02/nasa-life-form-bacteria-arsenic
santecarloni

NASA - NASA Sets News Conference on Astrobiology Discovery; Science Journal Has Embargo... - 1 views

www.nasa.gov/...HQ_M10-167_Astrobiology.html

ET astrobiology space

shared by santecarloni on 01 Dec 10 - No Cached
  • santecarloni on 01 Dec 10
     
    I will put it on my calendar...
pacome delva

Special relativity passes key test - 2 views

physicsworld.com/...40834

phy quantum_gravity special_relativity gamma_ray_burst

shared by pacome delva on 15 Dec 09 - Cached
  • Granot and colleagues studied the radiation from a gamma-ray burst – associated with a highly energetic explosion in a distant galaxy – that was spotted by NASA's Fermi Gamma-ray Space Telescope on 10 May this year. They analysed the radiation at different wavelengths to see whether there were any signs that photons with different energies arrived at Fermi's detectors at different times.
  • According to Granot, these results "strongly disfavour" quantum-gravity theories in which the speed of light varies linearly with photon energy, which might include some variations of string theory or loop quantum gravity. "I would not use the term 'rule out'," he says, "as most models do not have exact predictions for the energy scale associated with this violation of Lorentz invariance. However, our observational requirement that such an energy scale would be well above the Planck energy makes such models unnatural."
  • Dario Izzo on 16 Dec 09
     
    essentially they made an experiment that does not prove or disprove anything -big deal-... what is the scientific value of "strongly disfavour"??? I also like the sentence "most models do not have exact predictions for the energy scale associated with this violation of Lorentz invariance" ... but if this is true WHAT IS THE POINT OF THE EXPERIMENT!!!! God, physics is in trouble ....
  • pacome delva on 17 Dec 09
     
    hum, null result experiments are not useless !!! there is always the hope of finding "something wrong", which would lead to a great discovery. For the state of theoretical physics (the "no exact predictions" quote), i totally agree that physics is in trouble... That's what happen when physicists don't care anymore about experiments...! All you can do now is drawing "nice"graph with upper bounds on some parameters of an all tunable weird theory !
pacome delva

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
pacome delva

Higgs hunters face long haul - 2 views

physicsworld.com/...41631

phy higgs particles

shared by pacome delva on 05 Feb 10 - Cached
  • to reduce the chances of the LHC being derailed again by a similar accident, physicists at the Geneva lab have decided to run the collider at just half its design energy for the next 18-24 months.
  • Once the 7 TeV run is over, CERN will shut the LHC down in 2012 for a year or more to prepare it to go straight to maximum-energy 14 TeV collisions in 2013. This will be a complex job that will involve replacing some 10,000 superconducting magnet connections with more robust ones.
  • choosing to stay at lower energies is a big price to pay in terms of the Higgs search. "We will need more than twice the data at 7 TeV compared to that needed at 10 TeV to reach the same discovery potential," she says. "At this energy we can at best expect to exclude a Higgs with a mass between 155 and 175 GeV."
  • pacome delva on 05 Feb 10
     
    no Higgs boson before 2013... and a replacement of 10,000 superconducting magnet connections ! Reminds me of the the gravitational detectors... no detection before an upgrade in 2013...! There are the big announcements to make the cash flow... and reality !
  • Luzi Bergamin on 05 Feb 10
     
    Higgs is almost 81, so he should better invest in his health if he wants the Nobel prize... But who cares, it's another 5 years window where high-energy theorists can produce nonsense with no experimental evidence. They should be happy!
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...
Luís F. Simões

Polynomial Time Code For 3-SAT Released, P==NP - Slashdot - 0 views

science.slashdot.org/...me-Code-For-3-SAT-Released-PNP

INF computer science mathematics algorithm complexity P=NP?

shared by Luís F. Simões on 20 Jan 11 - No Cached
  • "Vladimir Romanov has released what he claims is a polynomial-time algorithm for solving 3-SAT. Because 3-SAT is NP-complete, this would imply that P==NP. While there's still good reason to be skeptical that this is, in fact, true, he's made source code available and appears decidedly more serious than most of the people attempting to prove that P==NP or P!=NP. Even though this is probably wrong, just based on the sheer number of prior failures, it seems more likely to lead to new discoveries than most. Note that there are already algorithms to solve 3-SAT, including one that runs in time (4/3)^n and succeeds with high probability. Incidentally, this wouldn't necessarily imply that encryption is worthless: it may still be too slow to be practical."
  • Luís F. Simões on 20 Jan 11
     
    here we go again...
  • Luís F. Simões on 28 Feb 11
     
    slashdot: "Russian computer scientist Vladimir Romanov has conceded that his previously published solution to the '3 SAT' problem of boolean algebra does not work."
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