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Luzi Bergamin

World Fertility Patterns 2009 - 1 views

www.un.org/...worldfertility2009.htm

shared by Luzi Bergamin on 09 Mar 10 - Cached
  • Luzi Bergamin on 09 Mar 10
     
    fertility world_population
  • Luzi Bergamin on 09 Mar 10
     
    Perhaps Mister Burkeman should have read this first...
pacome delva

"Quantum trampoline" measures gravity - 2 views

physicsworld.com/...41208

phy atom_interferometry atom_gravimeter

shared by pacome delva on 15 Dec 09 - Cached
  • Physicists in France have come up with a new way of using bouncing ultracold atoms to measure the acceleration due to gravity. The technique involves firing vertical laser pulses at a collection of free-falling atoms, which bounces some atoms higher than others. When the atoms recombine at the centre of the experiment, they create an interference pattern that reveals that g is 9.809 m/s2 – just as expected for their Paris lab.
  • pacome delva on 15 Dec 09
     
    That's the lab I worked...
  • Dario Izzo on 16 Dec 09
     
    just being cinical ... but did not we know that g = 9.809 in Paris? I can also create a complex measurement procedure that will held pi = 3.1415, just as expected!!!
  • pacome delva on 17 Dec 09
     
    well, sure... the interest of such gravimeter is to be absolute, and for now slightly more accurate than the other type of absolute gravimeter which uses retroreflector and interferometry ( http://en.wikipedia.org/wiki/Gravimeter ). While the latter ones reached their limit in term of sensitivity, the atomic ones can be enhanced in many ways (using cooler atoms, better optics, etc...)
pacome delva

Power Law Explains Insurgent Violence - 1 views

sciencenow.sciencemag.org/...1

war power_law

shared by pacome delva on 18 Dec 09 - Cached
  • To try to explain the mechanism behind these patterns, the team borrowed a simple computer model from economics. The model treated all insurgencies like a marketplace--groups of people constantly deciding whether to act. Rather than coordinating, the groups simply watch the news. The size of the carnage reported at any given time determines the probability that a group of a given size will strike next. Like clockwork, the attacks over the course of the conflict--from the smallest to the most deadly--have the same distribution.
Joris _

Researchers Claim They Can Translate Infant Cries, But is it Just Noise? | Popular Science - 0 views

www.popsci.com/...ate-infant-cries-it-just-noise

shared by Joris _ on 22 Mar 10 - Cached
  • Joris _ on 22 Mar 10
     
    nice conclusion! Published paper: "Statistical method for classifying cries of baby based on pattern recognition of power spectrum" in Int. J. Biometrics, 2010, 2, 113-123
  • Ma Ru on 23 Mar 10
     
    This must have been a hot topic is space research during last months... well, at least within the ESA's Advanced Concepts Team ;-)
Juxi Leitner

Networked Networks Are Prone to Epic Failure | Wired Science | Wired.com - 1 views

www.wired.com/...networked-networks

tech networks failure

shared by Juxi Leitner on 27 Apr 10 - Cached
  • The interconnections fueled a cascading effect, with the failures coursing back and forth. A damaged node in the first network would pull down nodes in the second, which crashed nodes in the first, which brought down more in the second, and so on. And when they looked at data from a 2003 Italian power blackout, in which the electrical grid was linked to the computer network that controlled it, the patterns matched their models’ math.
  • Juxi Leitner on 27 Apr 10
     
    that would be an interesting "Systems of Systems" study for once ...
pacome delva

Phantom menace to dark matter theory - space - 08 July 2009 - New Scientist - 0 views

www.newscientist.com/...ace-to-dark-matter-theory.html

phy mond gravitation

shared by pacome delva on 05 Aug 09 - Cached
  • If MOND exists, it will appear as if there is an anomalous, "phantom" mass in that region, exerting a gravitational force on the bodies in our solar system.
  • According to Milgrom, this force should cause the orbits of the planets to precess - that is, their elliptical orbits around the sun should slowly change their orientation, over time tracing out a pattern like the petals of a flower.
pacome delva

Physics - Addressing the crowd - 0 views

physics.aps.org/...PhysRevLett.103.080404

phy atom_lattice nan

shared by pacome delva on 31 Aug 09 - Cached
  • Setting up patterns by removing atoms from specific sites allows the team to watch in situ tunneling processes and microengineer novel atomic interactions.
LeopoldS

Achtung! Die Spottdrossel kann Sie aus einer ganzen Menschenmenge herauspicken - Natur ... - 0 views

derstandard.at/?url=/?id=1242316155037

BIO AI birds pattern recognition

shared by LeopoldS on 18 May 09 - Cached
  • LeopoldS on 18 May 09
     
    incredible ... sorry for the german post but could not find to find the original paper (Tobias?)
ESA ACT

Is mathematical pattern the theory of everything? - 0 views

www.newscientist.com/...mg19626303.900

PHY crackpot

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    Widely believed to be nonsense among serious theorists.
ESA ACT

Large-scale pattern growth of graphene films for stretchable transparent electrodes : A... - 0 views

www.nature.com/...nature07719.html

electricity NAN nanotechnology polymerElectronics ENG NRG Chemistry

shared by ESA ACT on 24 Apr 09 - Cached
  • ESA ACT on 24 Apr 09
     
    wow ... look at this!
pacome delva

Ants Take a Cue From Facebook - ScienceNOW - 2 views

news.sciencemag.org/...-take-a-cue-from-facebook.html

bio ant social_network

shared by pacome delva on 13 Apr 11 - No Cached
  • This pattern of interactions matches how humans share information on social networking sites like Facebook, says the study's lead author, biologist Noa Pinter-Wollman. Most Facebook users are connected to a relatively small number of friends. A handful of users, however, have thousands of friends and act as information hubs.
  • computer simulations of the ants' social networks showed that information flows fastest when a small number of individuals act as information hubs. Fast-flowing information allows ant colonies to respond faster to threats such as predators and weather hazards, Pinter-Wollman says.
  • These well-connected ants might have an advantage in responding to threats, but they are also more vulnerable to infectious diseases, which can spread quickly through the colony.
  • pacome delva on 13 Apr 11
     
    for Tobi! nice analogy between the threat and the fast responding in human network
  • Ma Ru on 13 Apr 11
     
    Yet another example of "because scientifically accurate title would sound sooo boring".
Paul N

Bacteria Living in 'Cloud Cities' May Control Rain and Snow Patterns : DNews - 1 views

news.discovery.com/...nd-snow-an-unlikely-couple.htm

BIO science

shared by Paul N on 23 Aug 14 - No Cached
  • Paul N on 23 Aug 14
     
    Some bacteria can influence the weather. Up high in the sky where clouds form, water droplets condense and ice crystal grow around tiny particles. Typically these particles are dust, pollen, or even soot from a wildfire. But recently scientists have begun to realize that some of these little particles are alive - they are bacteria evolved to create ice or water droplets around themselves. old but might be worth a discussion
Thijs Versloot

The challenges of Big Data analysis @NSR_Family - 2 views

nsr.oxfordjournals.org/...293.full

big data

shared by Thijs Versloot on 27 Aug 14 - No Cached
  • Thijs Versloot on 27 Aug 14
     
    Big Data bring new opportunities to modern society and challenges to data scientists. On the one hand, Big Data hold great promises for discovering subtle population patterns and heterogeneities that are not possible with small-scale data. On the other hand, the massive sample size and high dimensionality of Big Data introduce unique computational and statistical challenges, including scalability and storage bottleneck, noise accumulation, spurious correlation, incidental endogeneity and measurement errors. These challenges are distinguished and require new computational and statistical paradigm. This paper gives overviews on the salient features of Big Data and how these features impact on paradigm change on statistical and computational methods as well as computing architectures.
annaheffernan

How to make tiny 3D flowers and peacocks from silicon - 1 views

physicsworld.com/...wers-and-peacocks-from-silicon

technology science PHY NAN

shared by annaheffernan on 27 Jan 15 - No Cached
  • annaheffernan on 27 Jan 15
     
    "Tilted table", "peacock" and "triple-floor building" are just three of many fantastical 3D structures that have been created by compressing simple 2D patterns. The new technique for creating these objects is called compressive buckling, and has been developed by researchers in the US, China and South Korea.
annaheffernan

How to make droplets chase each other and self-assemble into devices - 0 views

physicsworld.com/...and-self-assemble-into-devices

technology science PHY FUN

shared by annaheffernan on 17 Mar 15 - No Cached
  • annaheffernan on 17 Mar 15
     
    Droplets can be made to chase each other around a track and even self-assemble into devices, simply by mixing two everyday liquids. This remarkable discovery made by scientists in the US has already been used to create beautiful shapes and patterns, and could also be exploited to create optical components that assemble themselves and even to clean surfaces. It looks very like Jojo's self-assembling balls :p
Athanasia Nikolaou

Media Gallery for summer inspiration - 1 views

www.dynamicalsystems.org/pi

MATH PHY

shared by Athanasia Nikolaou on 05 Aug 14 - No Cached
  • Athanasia Nikolaou on 05 Aug 14
     
    Bifurcations, patterns and other visualised mathematical problems for zen. Even found an oscillatory chemical reaction "Belousov-Zhabotinsky". Had no idea such a thing existed :-)
Thijs Versloot

Is increased light exposure from screens and phones bad for your health? @Wired - 1 views

www.wired.com/...ificial-light-may-be-unhealthy

shared by Thijs Versloot on 19 Mar 15 - No Cached
  • Thijs Versloot on 19 Mar 15
     
    As Stevens says in the new article, researchers now know that increased nighttime light exposure tracks with increased rates of breast cancer, obesity and depression. Correlation isn't causation, of course, and it's easy to imagine all the ways researchers might mistake those findings. The easy availability of electric lighting almost certainly tracks with various disease-causing factors: bad diets, sedentary lifestyles, exposure to they array of chemicals that come along with modernity. Very difficult to prove causation I would think, but there are known relationships between hormone levels and light.
  • Paul N on 21 Mar 15
     
    There is actually a windows program called flux, that changes the temperature on your screen to match normal light cycles. When the sun sets it switches to a "warmer" more reddish tint on your screen to promote sleepiness. The typically bright blue/neon white settings of most pc settings is quite "awakening" and keeps your brain running for longer. This impacts your sleeping patterns and all the consequences of that. Amazingly, this flux thing does have an effect. That being said, I wouldn't be too quick to blame it all on PC/artificial lighting time. Sedentary lifestyles, etc can very well place one in a position of long term pc/phone usage so it's quite hard to draw a causal link.
  • LeopoldS on 23 Mar 15
     
    nice - also exists for MAC btw: https://justgetflux.com/news/pages/mac/
jcunha

A Metalens with a Near-Unity Numerical Aperture - 0 views

pubs.acs.org/...acs.nanolett.8b00368

PHY metalens

shared by jcunha on 03 Apr 18 - No Cached
  • jcunha on 03 Apr 18
     
    A flat metalens based on the control of the diffraction pattern of individual nanoantennas can achieve NA~1 bending light at angles as high as 82º
LeopoldS

The Moon's mantle unveiled - 2 views

www.nature.com/...d41586-019-01479-x

China Moon exploration geology

shared by LeopoldS on 17 May 19 - No Cached
  • LeopoldS on 17 May 19
     
    first science results reported in Nature (as far as I know) from the Yutu-2 and Chang'e mission .... and they look very good!
  • Athanasia Nikolaou on 17 May 19
     
    Sure they are very useful! It will be even better if they manage to fit the data to modeled circulation of the lunar magma ocean that was formed posterior to the "Theia" body collision with Earth. The collision was the cause of the magma ocean in the first place. The question now is how this circulation pattern of the lava-moon "froze" in time upon phase transition to solid. Because, what crystallizes last in sequence, is more rich in "incompatible" with the crystal structure, elements, we might combine data+models to predict their location. Those incompatible tracers are mainly radioactively decaying elements that produce heat (google publications about lunar KREEP elements (potassium (K), rare earth elements(REE), and phosphorus(P)). By knowing where the KREEP is: - we know where to dig for them mining (if they are useful for something, eg. Phosphorus for plants to be grown on the Moon) - we avoid planning to build the future human colony on top of radioactives, of course. The hope is that the Moon, due to lack of plate tectonics, has preserved this "signature of the freezing sequence". Let's see.
  • LeopoldS on 19 May 19
     
    thanks Nasia! very interesting comment
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