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Omar Loisel
Works at Expert Configuration Management - Integration - Dev but above all curious about everything (that's why I will never be a great poker player).
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Omar Loisel

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+Brian Koberlein I would like to know what do you think about that ?
 
BOSS makes the most precise measurement yet of the universe's expansion.

"An artist's conception of how BOSS (Baryon Oscillation Spectroscopic Survey) uses quasars to measure the distant universe. Light from distant quasars is partly absorbed by intervening gas, which is imprinted with a subtle ring-like pattern of known physical scale."

Read more in this story by  +Lawrence Berkeley National Laboratory  for +Astronomy magazine

http://www.astronomy.com/news/2014/04/boss-makes-the-most-precise-measurement-yet-of-the-universes-expansion
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Omar Loisel

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Dans un futur proche, le monde tel que nous le connaissons n'existe plus, les continents ont été modifiés, les villes détruites, et les sociétés radicalement écrasées. Seules quelques poignées d'humains ont survécu à ce qu'on appelle « le grand bouleversement », on les divise en deux catégories, les Niveaux 1, suffisamment conscients pour évoluer dans le monde qui les entoure, et les Niveaux 0, humanoïdes gravement décérébrés, domestiqués par les Niveaux 1.
Dans ce nouveau monde, Hector et Karl, deux nomades suivis par leur étrange compagnon Moulineks, vont voir leur destin brusquement changer lorsqu'un homme leur confie la mission de protéger le secret du « Multicube ». Grâce à un simple parchemin, ils vont commencer un très long voyage à la recherche de l'objet, croisant sur leur route de nouveaux amis et de terribles adversaires . Réussiront-ils à finir leur quête ?

Korben: http://urlc.fr/JKzHsD
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je suis tres interesse j'aime la science.
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Omar Loisel

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Quatrième article pour “dans les coulisses d’une app” de “My System Coach” :  Le design et l’ergonomie. Ou comment essayer de ne pas trop perdre l’utilisateur dans une appli moche.
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Omar Loisel

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Cefaly, des électrodes externes contre la migraine

Une entreprise belge propose un appareil simple pour lutter contre la migraine. Placée au niveau du front, une électrode adhésive en forme de diadème aide à réduire la douleur et à prévenir les crises. Les États-Unis ont ouvert leur marché à cette thérapie innovante contre les troubles migraineux.

Plus d'info: http://urlc.fr/JBh2Kf

Entre violents maux de tête, vomissements et nausées, la migraine peut parfois gâcher la vie et rendre le quotidien difficile. De nombreuses personnes sont victimes de ce mal qui touche près de 12 % des Français, des femmes pour la plupart. Le système Cefaly, développé par une entreprise belge, pourrait faciliter la vie des malades. © rachel a. k., Flickr, cc by nc sa 2.0
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La science est toujour en evolution et a la disposition de l etre humain si ce dernier l etulise dans le bon sence
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Omar Loisel

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Tectonique des plaques : les origines enfin élucidées

Les plaques tectoniques sont mobiles les unes par rapport aux autres à la surface de la Terre. Comment leur découpage s’est-il produit ? Des chercheurs français proposent le premier modèle qui explique le phénomène sur Terre et indique pourquoi il ne s’est pas produit sur Vénus, pourtant considérée comme la planète jumelle de la Terre.

Plus d'info: http://urlc.fr/6KXLZh

Cette carte représente les principales plaques tectoniques de la Terre. Les surfaces sont déformées par la projection de Mercator. Comment ces plaques se sont-elles formées ? Une nouvelle étude montre qu’il s’agirait d’un équilibre entre des mouvements rapides de convection du manteau terrestre et une cicatrisation plus lente. © Wikimedia Commons, DP
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You are so interesting Omar,!
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Put a Ring On It

Astronomers have found an asteroid with a ring system, and the results have been published Nature (pdf: http://goo.gl/kvPF2u). While this is the first discovery of a ring system about an asteroid, such a thing isn’t entirely unexpected.  We have known for a while that asteroids can have moons, for example.  But what’s particularly interesting is how they discovered these rings.

The asteroid in question is known as  Chariklo, a 130 kilometer wide object that orbits between the orbits of Saturn and Uranus.  It is the largest example of the Centaur group, which are likely Kuiper belt objects that were captured by the gravitational pull of the outer planets.  In the Summer of 2013, Chariklo passed in front of a dim, 12th-magnitude star as seen from parts of South America.  It is a phenomenon known as an occultation.

Such an event is a great opportunity to better determine the size and shape of an asteroid, so a team of astronomers dispersed through Brazil, Argentina, Uruguay and Chile made observations of the occultation.  Since each observation is made from a different vantage point, Chariklo’s occultation of the background star occurs at a slightly different orientation.  By combining these different observations the team could map the overall shape of the asteroid.

But what the team found was that from some vantage points the background star dimmed a couple times before being occulted by Chariklo, then dimmed a couple times after the occultation as well. Analysis of these pre and post dips makes it pretty clear that there are at least two rings around the asteroid.

Knowing that Chariklo has a ring system, the team was also able to determine a bit about the composition of the rings.  As Chariklo (or any other ringed object) orbits the Sun, there are times when the rings are seen more edge on, and times when we see more of the rings.  The team compared spectral observations of the asteroid between 1997 and 2008, and found that the asteroid gradually dimmed during that period.  The observation of water ice in the spectrum also faded during that period.  This would be consistent with a ring system containing ice (which is very reflective) gradually shifting to an edge-on orientation.

One of the more surprising aspects of the discovery is that the rings are so sharp and dense.  Typically a ring system would diffuse over time unless there are shepherd moons to keep the rings in order.  So it may be that Chariklo has not only a ring system, but a moon system as well.

To determine whether that is the case, it will likely take some high resolution imaging.  But that remains to be seen.

Image: Lucie Maquet

Paper:  F. Braga-Ribas, B. Sicardy, et al. A ring system detected around the Centaur (10199) Chariklo. Nature (2014) doi:10.1038/nature13155.
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Omar Loisel

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Éruption de Santorin : nouveau rebondissement dans la datation

L'éruption minoenne qui a donné lieu à la formation de la caldera de Santorin a peut-être été à l'origine du mythe de l'Atlantide. Il y a quelques années, des datations au carbone 14 et l'étude des cernes de croissances des oliviers avaient situé l'événement au XVIIe avant J.-C. Mais une équipe de chercheurs met en doute la solidité de ces estimations, revenant aux âges avancés auparavant par les archéologues.

Plus d'info: http://urlc.fr/fdJsnH

Une vue de la caldera de Santorin, située en mer Égée. Elle provient d'une éruption de type plinien datant du IIe millénaire avant J.-C. qui projeta des pierres ponces et des cendres sur environ 60 m d'épaisseur autour du volcan, et jusqu'à 900 km au sud. Le volume de ponces qui fut éjecté lors de cette explosion est estimé à 30 km3. © Hartmut Inerle, Wikipédia, cc by sa 3.0
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Omar Loisel

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Partant du principe simple qu'une fois en ligne, vos données ne sont pas en sécurité, des chercheurs du MIT ont mis au point un framework (basé sur Meteor) nommé Mylar qui permet de sécuriser des applications web en chiffrant toutes les données en amont, c'est à dire directement sur votre navigateur avant de les envoyer au serveur.
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Large Predators Roamed Oceans Soon after Permian Extinction

A new study shows that large predators roamed the oceans soon after the End-Permian extinction--suggesting that ecosystems recovered more rapidly than previously thought.

Read more: http://urlc.fr/ksE3MD

Fossil and life reconstruction of Askeptosaurus, a large marine saurian from the Triassic time period. Such thalattosaurs ('marine or ocean lizards') could reach more than four meters in length. Credit: UZH
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In his circles
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Ingénieur informaticien - computer engineer
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  • Expert Configuration Management - Integration - Dev but above all curious about everything (that's why I will never be a great poker player).
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Palaiseau - Vanves - Paris - Berlin - Dusseldorf - Tacoma (WA)
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Amateur astronomy, cosmology, astrophysics and physics in general, music, film, photography, painting, sports and many other things - Amateur d'astronomie, de cosmologie, d'astrophysique et de physique en général, de musique, de cinéma, de photo, de peinture, de sport ainsi que de beaucoup d'autres choses
Introduction
Omar est mon prénom musulman; aussi beaucoup me connaissent également sous le prénom de Stéphane.
My hobbies? science, techno, photos, sport, music ... to sum up : life
I am an eternal seeker, that's why I try to forget everything I know. Beware of certainty and fight ignorance, the cancer in the world.
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Ma femme Zohra, mon fils Mustapha
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Stéphane Loisel
Omar Loisel's +1's are the things they like, agree with, or want to recommend.
Tchaïkovsky: Casse-Noisette (Les Etoiles du Bolchoï)
market.android.com

Shop Google Play on the web. Purchase and enjoy instantly on your Android phone or tablet without the hassle of syncing.

DiskUsage
market.android.com

DiskUsage provides a way to find files and directories on storage card which consume a lot of space.Displays diagram with directories/subdir

Gravity's lingua franca: Unifying general relativity and quantum theory ...
phys.org

(Phys.org) —Mathematics is, in essence, an artificial language for precisely articulating theories about the physical world. Unlike natural

Entropie et température
webinet.cafe-sciences.org

Dernier épisode de ma série sur la température... Maintenant que vous avez compris qu'entropie, manque d'information et désordre d'un systèm

Au fait c'est quoi l'entropie?
webinet.cafe-sciences.org

J'ai volontairement omis de vous parler d'entropie dans mon dernier billet sur les températures absolues négatives, car cette notion est tel

The emergence of complex behaviors through causal entropic forces
phys.org

(Phys.org) —An ambitious new paper published in Physical Review Letters seeks to describe intelligence as a fundamentally thermodynamic proc

Do Share
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The Archaeology News Network: Homing in on supernova originsHoming in on...
archaeologynewsnetwork.blogspot.com

Type Ia supernovae are important stellar phenomena, used to measure the expansion of the universe. But astronomers know embarrassingly littl

ZAGAT
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Trusted ratings & reviews for restaurants, nightspots, hotels and more.

University of Toronto scientists cast doubt on renowned uncertainty prin...
www.artsci.utoronto.ca

FOR IMMEDIATE RELEASE from the UNIVERSITY OF TORONTO Sept. 7, 2012. University of Toronto scientists cast doubt on renowned uncertainty prin

Why You'll Never Escape From A Black Hole : Starts With A Bang
scienceblogs.com

"They say 'A flat ocean is an ocean of trouble. And an ocean of waves... can also be trouble.' So, it's like, that balance. You know, it's t

Galaxies near the speed of light! : Starts With A Bang
scienceblogs.com

"The only reason for time is so that everything doesn't happen at once." -Albert Einstein Now that you know how many galaxies are in our exp

Two new surprises for three-body physics -
physicsworld.com

Efimov-like trimers could exist for long-range interactions and for fermions

DVICE: Quantum simulator can outperform a universe-sized computer
dvice.com

We always knew that one day, quantum computers would be powerful enough to blow traditional processors out of the water. A new quantum simul

Quantum Mechanics - Curiosity
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Quantum mechanics is a fascinating topic with lots a questions surrounding it. Learn more about quantum mechanics from Curiosity.

arXiv.org Search
arxiv.org

Back to Search form. The URL for this search is http://arxiv.org/find/quant-ph/1/au:+Gosson_M/0/1/0/all/0/1. Showing results 1 through 23 (o

What are quarks, and why do they have colors and flavors?
io9.com

Quarks make up all matter, but have never been seen by themselves. And they have "flavors" and "colors" — though neither term has any releva

The End of Space and Time? - Professor Robbert Dijkgraaf
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Robbert Dijkgraaf's focus is on string theory, quantum gravity, and the interface between mathematics and particle physics, bringing them to