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Francesco Biscani

Claimed Proof That P != NP - 4 views

science.slashdot.org/...Claimed-Proof-That-P--NP

inf

shared by Francesco Biscani on 09 Aug 10 - Cached
LeopoldS liked it
  • Ma Ru on 10 Aug 10
     
    Yet another one? Wish him good luck... I doubt anyone will waste time peer-reviewing his article. Here's quite a nice overview of the efforts on the problem: http://www.win.tue.nl/~gwoegi/P-versus-NP.htm
  • LeopoldS on 11 Aug 10
     
    thanks Marek - very nice link indeed ... did not know about it
duncan barker

ESA Proves General Theory of Relativity Wrong???? - 3 views

refreshingnews9.blogspot.com/...hat-proves-general-theory.html

science space

shared by duncan barker on 12 Aug 10 - Cached
  • Luzi Bergamin on 12 Aug 10
     
    Not again, pleeeaaase!!! Alright, you don't know the story, ask Dario or Leo...
  • LeopoldS on 12 Aug 10
     
    he just did .... don't worry, it's already over again .... how are you btw?
duncan barker

Challenging Existence of 'Absolute Time' - 3 views

www.21stcenturysciencetech.com/...time.html

phy

shared by duncan barker on 12 Aug 10 - Cached
  • Luzi Bergamin on 12 Aug 10
     
    I doubt that Shnoll is really the first one making such experiments, but perhaps they are more complete than any others done before. Similar things are very popular in the context of Psychology and more exotic fields. If I remember correctly someone ran long experiments with random number generators... Mostly the stories died after a short time, since the experiments are not reproducable. Anyway, why do these guys always have to claim that their work is somehow fundamentally changing our view of physics, notoriously referring to Einstein-Bohr debates and this stuff. That's nonsense! If these effects exist the first explanation is always much simpler. There is somewhere something that influences physics on Earth in a defined way. But this influence depends on the relative position or whatever of the Earth to that whatever-it-is. No problem with absolute time and all that sh...
  • LeopoldS on 12 Aug 10
     
    Two years ago, nearly unnoticed in the West, the Russian biophysicist S.E. Shnoll published a paper in the prominent Russian physics journal Uspekhi Fisicheskikh Nauk ..... ah then ...
  • Luzi Bergamin on 12 Aug 10
     
    You are right, Leo, they are mostly Russians that publish in some unspellable Journals nobody knows.... or then they are supported by Templeton Foundation.
pacome delva

Direction Changes of Insect Swarms - 2 views

focus.aps.org/st4

phy swarms

shared by pacome delva on 28 Jul 10 - Cached
  • Swarms of insects or schools of fish can suddenly switch direction, seemingly at random. A research team now believes they understand why. In the August Physical Review E they describe experiments with locusts and their mathematical model of the swarm. The model suggests that tiny alignment errors between neighboring individual locusts within the swarm, which normally cancel each other, can accumulate over long times and eventually cause the entire swarm to suddenly move in a new direction.
Joris _

NASA's next destination: a near-Earth asteroid? | National | Chron.com - Houston Chronicle - 0 views

www.chron.com/...7188211.html

NEO Human_Exploration

shared by Joris _ on 07 Sep 10 - No Cached
  • At a workshop last month in Washington, D.C., NASA canvassed the scientific, human spaceflight and planetary defense communities about their priorities for a mission to a near-Earth asteroid.
  • an asteroid mission is possible as early as 2019 using a pair of enhanced Orion spacecraft with a two-person crew.
  • November 2019 and spend three months flying more than 7 million miles to an asteroid that's about 33 feet across.
  • ...2 more annotations...
  • he crew would "park" their vehicle nearby and spacewalk over
  • After about five days the crew would climb back into one of the capsules and spend three months flying home.
nikolas smyrlakis

The Space Game - 3 views

games.slashdot.org/...h-Design-Your-Route-To-Jupiter

space game

shared by nikolas smyrlakis on 05 Oct 10 - No Cached
  • nikolas smyrlakis on 05 Oct 10
     
    already on slashdot with a lot of comments. Amazing work, I have no words ! I will just start playing
  • nikolas smyrlakis on 05 Oct 10
     
    best comment, act style : If we assume teleporters, it wouldn't even take a second. Therefore my completely unrealistic solution is much better than your completely unrealistic
Joris _

Is It Time To Revamp Systems Engineering? | AVIATION WEEK - 1 views

www.aviationweek.com/...story.jsp

engineering

shared by Joris _ on 02 Nov 10 - No Cached
LeopoldS liked it
  • They both believe the systems engineering processes that have served the aerospace and defense community since pre-Apollo days are no longer adequate for the large and complex systems ­industry is now developing.
  • Joris _ on 02 Nov 10
     
    1) it has to actively work and produce a result that's what you intended 2) the design must be robust. 3) it should be efficient 4) it should minimize unintended consequences. "But we have to establish a formal, mathematically precise mechanism to measure complexity and adaptability . . . [where] adaptability means the system elements have sufficient margin, and can serve multiple purposes." "We need to break the paradigm of long cycles from design to product" some interesting questions....
  • ...1 more comment...
  • LeopoldS on 02 Nov 10
     
    indeed ... already hotly debated in CDF ... any suggestions in addition to what we already contributed to this (e.g. system level optimisation)
  • Joris _ on 03 Nov 10
     
    what is the outcome of the CDF study ? I think actually that optimisation is not at all the key point. As it is stressed in this news, it is robustness (points 2 and 4). This is something we should think about ...
  • Luzi Bergamin on 03 Nov 10
     
    SYSTEM OF SYSTEMS, SYSTEM OF SYSTEMS!!! :-D
pacome delva

Neutron Star Formation Could Awaken the Vacuum | Physical Review Focus - 0 views

focus.aps.org/st14

phy quantum_field_theory general_relativity

shared by pacome delva on 05 Nov 10 - No Cached
  • Lima and Vanzella joined with George Matsas of São Paulo State University in their latest work to examine a model of the highly-curved spacetime that appears during formation of an ultradense neutron star. For some reasonable values of the mass and size of the star, they predict that the vacuum energy will grow within milliseconds for some values of the coupling parameter. At this point the vacuum energy would begin to induce additional gravitational effects, which they haven't yet calculated, so they don't know how the star would be affected. If further research shows such a neutron star to be unstable, the existence of stable neutron stars of particular sizes could rule out the existence fields of the type they modeled.
Joris _

Cross-section of innovators discusses the future at TEDxNASA - dailypress.com - 2 views

www.dailypress.com/...-tedx-20101104,0,1840857.story

TED

shared by Joris _ on 05 Nov 10 - No Cached
  • Joris _ on 05 Nov 10
     
    hmmm, we could have done something! ... http://www.tedxnasa.com
Joris _

Japan plans to send a robot to the moon | The Australian - 1 views

www.theaustralian.com.au/...story-e6frg8y6-1225947783972

robot space moon

shared by Joris _ on 04 Nov 10 - No Cached
  • the little android's oil bearings and ultrasonic sensors will not work in the lunar vacuum
  • The one-sixth gravity presents problems for stable movement, and Moon dust clogs joints.
  • the Japan Aerospace Exploration Agency (Jaxa), the country's space agency. It runs the rockets needed to deliver their robot to the Moon and, so far, has been distinctly cool on the idea.
  • Joris _ on 04 Nov 10
     
    Interesting! I like the quote "Maybe China would allow that to be a one-way trip but, in Japan, it would have to be a return ticket" talking about a human mission ....
santecarloni

Space-time cloak could hide events : Nature News - 3 views

www.nature.com/...news.2010.611.html

phy cloak space-time

shared by santecarloni on 19 Nov 10 - No Cached
LeopoldS liked it
  • santecarloni on 19 Nov 10
     
    I think they are taking it a bit too far....
  • ...1 more comment...
  • Luzi Bergamin on 19 Nov 10
     
    I'm a little bit surprised as well about the crude story of the burglar, pure nonsense, of course! But the paper is deadly serious, Alberto and Paul are my best collaborators in metamaterials and optics, they are not this type of TV-show scientists as Leonhardt etc. But as Alberto told me: just put the name "cloak" in the title and you're in all the news. It's not science, it's kindergarden :-(.
  • LeopoldS on 20 Nov 10
     
    is my memory wrong or isn't this what you have already mentioned as theoretically possible a few years back when discussing this, Luzi?
  • Luzi Bergamin on 21 Nov 10
     
    Very well possible that I mentioned this. In fact I was one of the first who took spacetime transformations in transformation optics seriously. But first, my name is not Leonhardt and I don't work at Imperial, that's why nobody cites me and second I most probably found the idea too stupid to be published. You see the two reasons why I'm not successful in science...
pacome delva

A Phase Transition for Light | Physical Review Focus - 3 views

focus.aps.org/st19

phy liquid_light electromagnetism

shared by pacome delva on 22 Nov 10 - No Cached
  • A computer simulation shows the transition from "fermionic" to "liquid" light.
  • The possibility of sending this type of "self-focused" light pulse long distances could be important for remote sensing applications, such as LIDAR, which uses laser light the way radar uses radio waves.
  • LeopoldS on 23 Nov 10
     
    what the heck is this?? sounds really strange but highly interesting to me ....
  • LeopoldS on 23 Nov 10
     
    can we use this for energy transmission?
  • LeopoldS on 23 Nov 10
     
    read it now more carefully and the answer is probably no ...
Luís F. Simões

Why the World Is Running Out of Helium - Slashdot - 0 views

science.slashdot.org/...World-Is-Running-Out-of-Helium

helium fusion

shared by Luís F. Simões on 03 Dec 10 - No Cached
  • Luís F. Simões on 03 Dec 10
     
    following up on the lunchtime discussion. An older link is available here: http://science.slashdot.org/article.pl?sid=08/01/14/0219246
LeopoldS

Times Higher Education - Top nations in physics - 5 views

www.timeshighereducation.co.uk/story.asp

statistics physics PHY

shared by LeopoldS on 18 Feb 10 - Cached
  • LeopoldS on 18 Feb 10
     
    another stat on publication comparisons - this time physics
  • Nicholas Lan on 26 Feb 10
     
    see, it's not just football where Scotland compete separately from england
nikolas smyrlakis

How Twitter and Facebook Make Us More Productive | Magazine - 1 views

www.wired.com/...st_essay_distraction

twitter facebook distraction

shared by nikolas smyrlakis on 24 Feb 10 - Cached
  • nikolas smyrlakis on 24 Feb 10
     
    "This means that tweets about Lady Gaga's lingerie can help someone debugging Perl code. (Or a tweet about Perl code may help Lady Gaga's underwear stylist.) "
Joris _

Why Computers Can't Mimic The Brain - Forbes.com - 3 views

www.forbes.com/...ology-breakthroughs-brain.html

BIO brain

shared by Joris _ on 06 Dec 09 - No Cached
  • engineers seem to have a diminished ability to understand biology
  • Remember them the next time you read a story claiming some brain-like accomplishment of a computer. The only really human thing these programs are doing is attracting attention to themselves
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