Jeżeli do oprogramowania inżynierskiego można podpiąć własne procedury to NVIDIA udostępnia darmowy driver NVCC za pomocą którego można kompilować kod napisany w C. Można to robić z Visual Studio (od wersji 10) pod Windows lub używając gcc pod Linuxem.
Wówczas oprogramowanie optymalizuje się pod posiadaną kartę graficzną. Warto mieć kartę o CUDA capability większym niż 2.0 ze względu na obsługę typu double.Zobacz Komentarze Newsów
Czy ktoś z forum korzysta może z Elmera? Bardzo ciekawi mnie jak to działa. Bo z tego tutka wynika, że jest OK, a tymczasem ja próbowałem... bezskutecznieZobacz Komentarze Newsów
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Dodane dnia 02/01/2009 01:34
New High-Tech Material for Space Elevator Project Developed by Cambridge University Team
Ever since it was first popularised by Arthur C Clarke, the idea of a r0;space elevatorr1; has languished in the realms of science fiction. But now a team of British scientists has taken the first step on what could be a high-tech stairway to heaven. Spurred on by a 4 millons dollars research prize from Nasa, a team at Cambridge University has created the worldr17;s strongest ribbon: a cylindrical strand of carbon that combines lightweight flexibility with incredible strength and has the potential to stretch vast distances.
The development has been seized upon by the space scientists, who believe the technology could allow astronauts to travel into space via a cable thousands of miles long r12; a space elevator.
They predict the breakthrough will revolutionise space travel. It has a point, though at this stage it is still a tenuous one. Such an elevator could potentially offer limitless and cheap space travel. At a stroke, it would make everything from tourism to more ambitious expeditions to Mars commercially viable. The idea couldnr17;t come too soon for Nasa, which spends an estimated £308m every time the shuttle blasts off, not to mention burning about 900 tons of polluting rocket fuel.
The American space agency is already staring at a black hole in its finances that means it will not replace its ageing shuttle fleet r12; due to retire in 2010 r12; until 2014 at the earliest. Without its own transport, Nasa has recently contracted private firms such as SpaceX, headed by Elon Musk, the internet entrepreneur, to provide transport to and from the International Space Station. The idea of an elevator could solve the problem r12; although perhaps not quickly enough for Nasa.
Space elevator project design
The Cambridge team is making about 1 gram of the high-tech material per day, enough to stretch to 18 miles in length. r0;We have Nasa on the phone asking for 144,000 miles of the stuff, but there is a difference between what can be achieved in a lab and on an industrial level,r1; says Alan Windle, professor of materials science at Cambridge University, who is anxious not to let the work get ahead of itself.
Enthusiasts say space elevators will be able to lift material more than 22,000 miles into orbit for as little as £300 per pound weight, compared with about £14,000 per pound using existing rockets. That would open up the possibility of tourists visiting a sky hotel in orbit, with a view previously enjoyed only by astronauts. It would also allow for far cheaper travel to the moon and planets since most of the energy required by rockets is used simply to escape Earthr17;s gravity.
The concept of a lift into space was first proposed in 1895 by Konstantin Tsiolkovsky, a Russian scientist who was inspired by the Eiffel tower. The idea continued to be batted around in scientific circles until the late 1970s when Clarke based his novel The Fountains of Paradise on the idea. In it he asked: r0;If the laws of celestial mechanics make it possible for an object to stay fixed in the sky, might it not be possible to lower a cable down to the surface and so establish an elevator system linking Earth to space?r1;
At the time the answer was a resounding r0or1;, and Clarke admitted the idea would be met with laughter for years to come, but over the past decade the concept has moved from the fringes of the scientific establishment towards the mainstream.
The theory sounds plausible: a cable is extended up to a station 22,245 miles into space r12; the point at which satellites stay in geostationary orbit r12; and kept under tension by the competing forces of gravity on Earth and the outward centrifugal acceleration at the platform end. The cable then extends a further 40,000 miles into space to a counterweight that helps keep the whole structure stable. An elevator is attached and powered up the cable much like a train on a celestial track.
The idea is still in the realms of science fiction, and no one is expecting it to become a reality for at least another decade, but the concept is gaining currency. Last year saw the formation of the International Space Elevator Consortium, an independent group designed to promote the idea.
Nasa has pledged $4m over five years from its Centennial Challenges programme to the Elevator: 2010 competition. The contest challenges teams to build working scale models of an elevator that can travel 1km vertically upwards at a minimum speed of 2 metres per second. The best performance so far is just 100 metres at a speed of 1.8 metres per second. The next challenge is scheduled for April.
r0;We are talking about something totally different from the conventional concept of space travel,r1; says Ben Shelef, chief executive officer of the Spaceward Foundation, Nasar17;s partner in the project. r0;This is not about three astronauts on a special mission, it is about hundreds of tons a day being lifted into orbit. I often say that we shouldnr17;t be dealing with Nasa on this, we should be dealing with the US Department of Transportation.r1;
Shelefr17;s plans have big long-term goals. r0;It will start with supplies, but many of the worldr17;s problems are due to overcrowding so eventually we see the elevator as a way of shifting human life off Earth and into space.r1;
Given the distance any cable would have to stretch and the stresses it is under at the top to support its own weight, it would need to taper as it reaches Earth. A conventional cable that is one strand thick at Earth level would therefore be about as wide as the whole planet at 22,000 miles. And this is the problem the Cambridge team thinks it may have solved.
The discovery in the 1990s of r0anotubesr1; (a cylindrical version of carbon) meant that for the first time a material strong and light enough was possible. However, these nanotubes proved too brittle to be formed into long strands. The Cambridge team has found a way of combining separate nanotubes into web-like structures that bind to form longer strands.
r0;The key thing is that the process essentially makes carbon into smoke, but because the smoke particles are long thin nanotubes, they entangle and hold hands. We are actually making elastic smoke, which we can then wind up into a fibre,r1; says Windle.
He also suggests the technique has enormous possibilities r12; many of them more mundane r12; for everything from bulletproof vests to car manufacture. However, it is the possibility that it could be used for a space elevator that excites him. r0;It is an eye-catching idea, and you have to aim high,r1; he says, adding that the creation of material strong enough for such an idea is about five to 10 years away.
The teamr17;s results were outlined at a conference last month in Luxembourg, which gathered together hundreds of futurists, Nasa researchers and representatives of the European Space Agency. John Winter of EuroSpaceward, the agency that organised the conference, says the advance proves the idea of stretching a cable, or tether, from the Earth to a station in space, along which a vehicle can travel, is closer to becoming a reality than previously thought.
r0;The biggest problem has always been finding a material that is strong enough and lightweight enough to stretch tens of thousands of miles into space,r1; says Winter. r0;This isnr17;t going to happen probably for the next decade at least, but in theory this is now possible. The advances in materials for the tether are very exciting.r1;
http://www.timesonline.co.uk
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or1;, and Clarke admitted the idea would be met with laughter for years to come, but over the past decade the concept has moved from the fringes of the scientific establishment towards the mainstream.
