Ressources énergétiques et énergie électrique

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En-ROADS - Climate Interactive Climate Change Solutions Simulator En-ROADS is a transparent, freely-available policy simulation model that gives everyone the chance to design their own scenarios to limit future global warming. You can try your own experiments and assumptions, and get immediate feedback on the likely impacts. The simulation, developed by Climate Interactive, Ventana Systems, and MIT Sloan, runs on an ordinary laptop in a fraction of a second, is available online, offers an intuitive interface, has been carefully grounded in the best available science, and has been calibrated against a wide range of existing integrated assessment, climate and energy models.

VO Solar System Portal The IMCCE is a research institute of the Paris Observatory of Paris, associated with the CNRS (UMR8028), whose work concerns mainly the dynamic and planetologic studies of the bodies of the solar system and of the terrestrial environment: planets, natural satellites, asteroids, comets and meteoroids. For this reason, IMCCE has the ambition to place at the disposal of the Virtual observatory its knowledge and its expertise concerning the dynamics and the physics of the bodies of the solar system through databases, ephemeris computation services, tools of simulation, and numerical computation services fully compliant with the interoperability concept of the Virtual Observatory. The first stage of VO-IMCCE project consisted, in 2003, to carry out an interconnection between VizieR (CDS) and the IMCCE service of calculation of ephemerides for the asteroids. In 2004, we began the development of tools and services in the framework of the Virtual Observatory.

Tiny optical frequency clock measures time accurately to 270 quintillionths of a second Researchers at the UCLA Henry Samueli School of Engineering and Applied Science have created an optical clock that's just 1 cubic centimeter—small enough to fit on a standard silicon chip—and can track time intervals with precision to 270 quintillionths of second. (One quintillionth is equivalent to 1 times 10 to the negative 18th power, or 0.000000000000000001.) Today's most accurate clocks, atomic clocks, are used to keep time for the Internet and satellite communications, and help astronomers detect Earth-like planets beyond our solar system. Their accuracy—to "only" within a tenth of trillionths of a second, or 1 times 10 to the negative 13th power—is based on the naturally occurring frequencies of atoms that respond to radiation. Previous optical clocks were much larger than the new one developed at UCLA: They used large fiber lasers that needed to be housed in equipment about the size of a desktop computer.

Using optical fiber to generate a two-micron laser Lasers with a wavelength of two microns could move the boundaries of surgery and molecule detection. Researchers at EPFL have managed to generate such lasers using a simple and inexpensive method. In recent years, two-micron lasers (0.002 millimetre) have been of growing interest among researchers. In the areas of surgery and molecule detection, for example, they offer significant advantages compared to traditional, shorter-wavelength lasers.However, two-micron lasers are still in their infancy and not yet as mature as their telecom counterparts (1.55-micron). Moreover sources currently used in labs are typically bulky and expensive.

Make an Electromagnet A large iron nail (about 3 inches) About 3 feet of THIN COATED copper wire A fresh D size battery Some paper clips or other small magnetic objects 1. Leave about 8 inches of wire loose at one end and wrap most of the rest of the wire around the nail. Try not to overlap the wires. 2. Climate.NASA: Causes › en español Scientists attribute the global warming trend observed since the mid-20th century to the human expansion of the "greenhouse effect"1 — warming that results when the atmosphere traps heat radiating from Earth toward space. Certain gases in the atmosphere block heat from escaping. Long-lived gases that remain semi-permanently in the atmosphere and do not respond physically or chemically to changes in temperature are described as "forcing" climate change. Gases, such as water vapor, which respond physically or chemically to changes in temperature are seen as "feedbacks." Gases that contribute to the greenhouse effect include:

Sub-solar and sub-lunar points. Current zenith locations. Not small-screen optimized, but you should be able to scroll sideways. The Map The sub solar point is the yellow marker. The blue one is the ”sub lunar” point. When you are at these locations, you will have the Sun/Moon directly over your head. Hyper-precise atomic clocks face off to redefine time A strontium-ion optical clock housed at the National Physical Laboratory in Teddington, UK. Happy birthday, caesium clock. Now move over. As the atomic clock used to define time itself turns 60, tests are set to begin on a new generation of clocks that are designed to give the caesium version a run for its money.

sans titre Chemotherapeutic drugs excel at fighting cancer, but they're not so efficient at getting where they need to go. They often interact with blood, bone marrow and other healthy bodily systems. This dilutes the drugs and causes unwanted side effects. Now, researchers are developing a better delivery method by encapsulating the drugs in nanoballoons – which are tiny modified liposomes that, upon being struck by a red laser, pop open and deliver concentrated doses of medicine. Described April 3 in the journal Nature Communications, the innovation could improve cancer treatment, reduce its side effects and boost research about the disease, which annually kills millions of people worldwide. A Wire Maze With an Electronics Twist Here is a SIMPLE and really FUN electronics project you can make at home. You don't need to make a printed circuit board which makes everything a whole lot easier! I'm sure you've played the "Wire Maze game"...(also called "Sammy the Snake" by shop teachers in our district... ) You thread a wire loop through a maze. A few years ago I built a simple latching circuit that would light (and keep lit) an LED if you touched the wire with the loop. Kids liked it but they were not thrilled by it so I added a ZAPPER in the handle.

SPIRIT & SPIRIT2 — LEGOS Summary The SPIRIT (SPOT 5 stereoscopic survey of Polar Ice: Reference Images and Topographies) project took place during the Fourth International Polar Year (2007/09) and built up a large archive of SPOT 5 stereoscopic images covering most polar ice masses. It allowed the free delivery of high resolution (5-m) ortho-images and 40-m digital elevation models (see "The Product"), data which have already contributed to >100 publications. These data are freely available for the glaciological community (see "Get Data").

NSTMF Gravity Observations Runaway planet! That object’s velocity is faster than any nearby gravitational force. How fast does a rocket need to travel to leave Earth? Any projectile must reach a speed of seven miles per second to break free of our planet’s gravity. The gravity on Mars’ moon, Deimos, is so low that if you jumped you could reach escape velocity!

Top-precision optical atomic clock starts ticking A state-of-the-art optical atomic clock, collaboratively developed by scientists from the University of Warsaw, Jagiellonian University, and Nicolaus Copernicus University, is now "ticking away" at the National Laboratory of Atomic, Molecular and Optical Physics in Toruń, Poland. As the first of its kind in Poland and one of just a handful of clocks of this caliber in the world, the new clock will keep track of the passage of time with extraordinary precision. Physicists from Warsaw, Toruń, and Cracow have constructed an atomic clock that is one of just a few of its kind in the world - already now, at an early stage of operation, it has most likely become Poland's most precise clock. The theoretical stability of the new clock, stemming from the advanced physical mechanisms it harnesses, means that it would take tens of billions of years for an error of a single second to accumulate - which is several times longer than the time that has passed since the Big Bang.

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