vendredi 14 mars 2008
Groupe CNW | PERIMETER INSTITUTE FOR THEORETICAL PHYSICS | Avec les élèves en tête, l'Institut canadien Perimeter offre une nouvelle vidéo sur la "mat
WATERLOO, ON, le 11 mars /CNW/ - L'Institut Perimeter de physique
théorique offre maintenant le premier volet d'une nouvelle série de ressources
éducatives pour l'école conçues pour aider les enseignants du secondaire à
présenter divers sujets scientifiques à leurs élèves.
Le premier module, portant sur 'Le mystère de la matière noire', comprend
un DVD de 25 minutes et un guide de l'enseignant, accompagnés de feuillets
d'activités pour les élèves et de suggestions de démonstrations pratiques. La
version intégrale de la vidéo et du jeu de documents peut être consultée en
ligne à l'adresse www.perimeterinstitute.ca et est offerte aux éducateurs en
version imprimée.
Conception créatrice et sur mesure
Décrite par la célèbre scientifique Vera Rubin comme '... inventive,
artistique et scientifiquement valide', la série Perimeter Explorations répond
à la princip"
La matière sombre est (encore) dans le noir | Agence Science-Presse
(Agence Science-Presse) – Les scientifiques d’un peu partout continuent de chercher la preuve de l’existence de la matière sombre. Et leur dernier échec... a été accueilli par une bonne main d’applaudissements!
Il est rare que des « non-résultats » soient accueillis avec enthousiasme. Ici, c’est parce que cet échec marque, malgré tout, une étape importante : l’un des plus puissants détecteurs de matière sombre du monde, installé au fond d’une mine du Minnesota, vient d’entrer en fonction; et ses premiers résultats, présentés le 22 février lors d’un congrès en Californie, donc ceux de ses nouveaux instruments, qui atteignent un plus haut niveau de sensibilité que jamais, ne révèlent rien. Sauf que ces instruments ne fonctionnent pas encore à plein rendement: les physiciens étaient donc heureux d’apprendre qu’on avait en quelque sorte franchi une nouvelle étape... même si on n’avait encore rien trouvé!
Tout ceci vous semble un peu obscur? Vous n’êtes pas le seul, puisqu’un journal du Minnesota n’a rien trouvé de mieux comme titre que : « Des scientifiques bâtissent une grosse ma"
lundi 29 octobre 2007
globeandmail.com: Deactivating brain area can stop addictions cold
Les neutrinos du CERN "photographiés" en Italie
lundi 22 octobre 2007
Actualité > Un nouvel accélérateur à Fermilab ?
mercredi 19 septembre 2007
Large Hadron Collider Project To Study The Origins Of Matter
Large Hadron Collider Project To Study The Origins Of Matter
Science Daily — The Scientific Information Port (PIC), a technological centre located on the campus of the UAB, recently started work on the first stage of the European project Large Hadron Collider (LHC), the largest particle accelerator in the world, which has the aim of reproducing conditions similar to those produced during the Big Bang in order to study the origins of matter.
The PIC, along with other computational centres located around the world, began to receive data on cosmic rays collected by ATLAS, one of the four detectors that will be used in the project. These data will be used to test the system before the accelerator is started up in April 2008.
The LHC project will be carried out by the European Laboratory for Particle Physics (CERN), and consists of a large particle accelerator located in a 27 kilometre-long underground tunnel which straddles the border between France and Switzerland. Inside the tunnel, proton beams will be accelerated at speeds close to the speed of light and will be made to collide. This will allow conditions of extremely high density energy to be reproduced, close to those of the initial instants of the universe, the Big Bang.
In this way we will be able to study the origin of matter and test the Standard Model of particle physics, that is the theory in force which explains the behaviour of elemental particles and which needs to be tested to check its validity.
The acceleration and collision of high energy particles generates enormous information which is detected by four pieces of apparatus. The detectors send this information to a series of computational centres located in Europe, Asia and America which store and process the data. One such centre is the PIC, a technological centre in which the UAB, the Centre for Energy, Environmental and technological Research (CIEMAT), the Generalitat of Catalonia and the Institute of High Energy Physics (IFAE) all participate.
Between 23 August and 3 September they decided to started to check how the system was working, by making one of the detectors, called ATLAS, detect data coming from cosmic rays and then transmit these data to various computational centres, including the PIC. It was, therefore, the first exercise where LHC data were sent in real time to centres outside the CERN.
During these days information on ten million events has been stored (particle collisions). This information will be used to test the data acquisition, distribution and detection systems. One analysed, the data will be used to refine the calibration parameters of the detector before it is put to work in 2008, with data coming from the experiments on particle acceleration and collision.
Note: This story has been adapted from a news release issued by Universitat Autonoma de Barcelona.
mardi 21 août 2007
Veille Sciences
Departmental and End User Computing
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Canadians use desktops, laptop to develop solar car By: Briony Smith IT World Canada (20 Aug 2007) | ||||||||||||||||
Queen’s University’s solar-powered vehicle program just got a great boost in its quest to craft the best solar vehicle in the world, thanks to Lenovo’s donation of some high-end hardware. Queen’s has a long-standing stake in the world of solar-powered vehicle racing, having hosted a team for the last two decades. The university’s Solar Vehicle Team, led by senior engineering student Jonathan Mash, is in the process of putting the finishing touches on Aurum, the university’s eleventh solar vehicle. Come autumn, the eight-man team will maneuver the vehicle 3,000 km down the length of Australia, from Darwin to Adelaide, in the World Solar Challenge. Competing as they are against near 50 other teams from almost two-dozen countries, Lenovo’s just-announced two-year sponsorship of the team comes just in time, and is outfitting the team with a Lenovo ThinkPad R60 and a pair of ThinkCentre desktops. The team is comprised of 50 undergrads from all disciplines who volunteer their time during the schoolyear, while the summer is staffed by a dozen full-time, paid students. According to Mash, they had been getting along with mediocre technology. “Before we got the Lenovo stuff, we’d been running Windows 95 on an old Compaq-style machine. The software we run is pretty heavy-duty stuff. We’d literally turn it on one day, load in some data, and then come back in a couple of days, and it might be done,” he said. “Now, with the new stuff, you can come back and hour later and it’s done.” This was a problem for a team who created a lot of proprietary software, dealt with heavy detail-rich data loads (including Ansys’ Fluent aerodynamics software), and even made their own hardware. “Every year, everything on the car is student-designed, from the electrical to the shape to the mechanics,” said Mash. (The University of Calgary and the University of Waterloo, two of the 10 or so active solar vehicle teams in the country, are also participating in the Challenge.) The ThinkCentre A60 (including a 17-inch monitor) will aid in designing circuit boards for the vehicle’s on-board telemetry system. Said Mash: “The telemetry system tracks battery, performance, solar collection -- solar vehicles are really finicky, so you need really good strategy to win the race, with detailed and fast information. You can’t plug it into the wall when you run out of batteries -- the only source of power is the sun, and that’s only out during certain times.”
The system, according to Mash, wirelessly sends data to the vehicle that trails Aurum, where team members utilize on the ThinkPad their in-house software that, said Mash, “can take in data, and can predict how fast you could drive and things like that, depending on the conditions.” While the program is proprietary, Mash said that he’d be happy to share it with the other teams. “Well,” he said, “At least the Canadian ones!” | ||||||||||||||||