ஜப்பான் ஆராய்ச்சியாளர்கள் அதிக சேமிக்கும் (கொள்ளவு) இடம்
கொண்ட ஒரு பிரத்யேக டிஸ்க் ஒன்றை உருவாக்கியுள்ளனர்
இதைப் பற்றிய சிறப்பு பதிவு.
எளிதாக எங்கும் எடுத்துசெல்ல சிடி, டிவிடி டிஸ்க் வந்த போதும்
மிக மிக அதிக அளவு கொள்ளவு கொண்ட ஒரு பிரத்யேக டிஸ்க்
ஒன்றை ஜப்பான் ஆராய்ச்சியாளர்கள் உருவாக்கியுள்ளனர்.இதன்
சேமிக்கும் அளவு 25 TB சற்று விரிவாக பார்ப்போம்.
8 Bits = 1 Byte
1024 Bytes = 1 Kilobyte (KB)
1024 Kilobytes = 1 Megabyte (MB)
1024 Megabytes = 1 Gigabyte (GB)
1024 Gigabytes = 1 Terabyte (TB )
இப்போது நாம் பயன்படுத்திக் கொண்டிருக்கும் CD யின் சேமிப்பு
இடம் 700 MB ,அதே போல் இப்போது நாம் பயன்படுத்திக்
கொண்டிருக்கும் DVD -யின் சேமிப்பு இடம் 4.7 GB . தற்போது
ஆராய்ச்சியாளர்கள் உருவாக்கியுள்ள இந்த டிஸ்க்-ன் சேமிப்பு
இடம் 25 TB . இந்த டிஸ்க் டைட்டானியம் ஆக்ஸைடு
மெட்டிரியல் கொண்டு உருவாக்கப்பட்டுள்ளது .ஒளிக்கற்றைகளை
இந்த டிஸ்க் -ன் மீது செலுத்தி தகவல்களை சேமிக்கின்றனர்
ஒளிக்கற்றைகளை செலுத்தும் போது வெவ்வேறு வண்ணம்
மூலம் இங்கு சேமிக்கப்படுகிறது.இதனால் இங்கு தகவல்களை
சேமிக்கும் நேரமும் எடுக்கும் நேரமும் மிகக் குறைவாகத்தான்
ஆகும். இதன் விலையும் அதிகமாக இருக்கப்போவதில்லை
என்று அறிவித்துள்ளனர்.
நன்றி: வின்மணி
  The outer E-ring on Saturn extends about 240,000km into space A colossal new ring has been identified around Saturn. The dusty hoop extends some 13 million km (8 million miles) from the planet, about 50 times further out into space than its more familiar rings. Scientists tell the journal Nature that the tenuous ring is probably made up of debris kicked off Saturn's moon Phoebe by small impacts. They think this dust then migrates towards the planet where it is picked up by another Saturnian moon, Iapetus.
The discovery would appear to resolve a longstanding mystery in planetary science: why the walnut-shaped Iapetus has a two-tone complexion, with one side of the moon significantly darker than the other. "It has essentially a head-on collision. The particles smack Iapetus like bugs on a windshield," said Anne Verbiscer from the University of Virginia, US. Observations of the material coating the dark face of Iapetus indicate it has a similar composition to the surface material on Phoebe. The scale of the new ring feature is astonishing. Nothing like it has been seen elsewhere in the Solar System. The more easily visible outlier in Saturn's famous bands of ice and dust is its E-ring, which encompasses the orbit of the moon Enceladus. This circles the planet at a distance of just 240,000km. The newly identified torus is not only much broader and further out, it is also tilted at an angle of 27 degrees to the plane on which the more traditional rings sit.
This in itself strongly links the ring's origin to Phoebe, which also takes a highly inclined path around Saturn. Scientists suspected the ring might be present and had the perfect tool in the Spitzer space telescope to confirm it. The US space agency observatory is well suited to picking up the infrared signal expected from cold grains of dust about 10 microns (millionths of a metre) in size. The ring would probably have a range of particle sizes - some bigger than this, and some smaller - and modelling indicates the pressure of sunlight would push the smallest of these grains towards the orbit of Iapetus, which is circling Saturn at a distance of 3.5 million km. "The particles are very, very tiny, so the ring is very, very tenuous; and actually if you were standing in the ring itself, you wouldn't even know it," Dr Verbiscer told BBC News. "In a cubic km of space, there are all of 10-20 particles." Indeed, so feeble is the ring that scientists have calculated that if all the material were gathered up it would fill a crater on Phoebe no more than a kilometre across. The moon is heavily pockmarked. It is clear that throughout its history, Phoebe has been hit many, many times by objects. Some will also have been orbiting Saturn; others will have come from deep space. | ||||
UN Secretary General Ban Ki-moon has called for urgent action on climate change, saying negotiations on reducing emissions were proceeding too slowly. He said failure to reach agreement at December's climate talks in Copenhagen would be "morally inexcusable". He was speaking at a UN meeting attended by about 100 world leaders in New York to revitalise the talks. Attention is likely to focus on Chinese President Hu Jintao, who is expected to unveil new steps to tackle emissions. The summit in Copenhagen is aimed at approving a global climate change treaty. Negotiators are trying to agree on a replacement for the Kyoto Protocol to limit carbon emissions. Chinese targets Mr Ban called the meeting an attempt to inject momentum into the deadlocked climate talks."Your decisions will have momentous consequences," he told the assembled leaders. "The fate of future generations, and the hopes and livelihoods of billions today, rest, literally, with you," he added. United States President Barack Obama said Americans understood the gravity of the climate threat and were determined to act, but there was much more work to be done. "If we are flexible and pragmatic; if we can resolve to work tirelessly in common effort, then we will achieve our common purpose: a world that is safer, cleaner, and healthier than the one we found; and a future that is worthy of our children," he said. According to the BBC's UN correspondent, Barbara Plett, discussions have stalled because rich nations are not pledging to cut enough carbon to take the world out of danger, while poorer countries are refusing to commit to binding caps, saying this would prevent them from developing their economies. China's role is crucial, because it is both an emerging economy and a big polluter, our correspondent says. The UN's chief climate change negotiator, Yvo de Boer, says he expects an important announcement from Beijing during the meeting. "China domestic policy is already very ambitious but yes I do expect something dramatic," he said.President Hu Jintao is expected to announce "carbon intensity targets" aimed at making Chinese industry more efficient, so that less carbon is produced per unit of energy generated. China has already leapfrogged the United States to become the world's biggest wind power market, and is a growing force in solar power - and analysts say President Hu may advance the country's renewable energy targets even further. But the BBC correspondent in Beijing, Quentin Sommerville, says it is unlikely that the Chinese will agree to a cap on their carbon emissions. Despite all its advances in green technology, China still gets 70% of its energy from coal - and as its economy increases, this means yet more growth in greenhouse gases, our correspondent says. Pressure on US There is also concern about the world's other big polluter, the United States.
President Barack Obama has recognised climate change as a pressing issue, unlike the previous administration, our UN correspondent says. He has already announced a target of returning to 1990 levels of greenhouse emissions by 2020, but critics say Washington is moving too slowly on legislation which does not go far enough. President Obama is currently dogged by domestic issues such as the economy and healthcare reforms, but his speech to the UN meeting will still be watched for signs he is willing to fulfil his pledge to take the lead in reaching a global carbon deal. A demonstration of political will by both China and the US will be important in breaking the deadlock in negotiations, correspondents say. China and the US each account for about 20% of the world's greenhouse gas pollution from coal, natural gas and oil. The European Union is responsible for 14%, followed by Russia and India with 5% each. | |||
The total solar eclipse, as seen across Asia People in Asia have seen the longest total solar eclipse this century, with large areas of India and China plunged into darkness. Amateur stargazers and scientists travelled far to see the eclipse, which lasted six minutes and 39 seconds at its maximum point. The eclipse could first be seen early on Wednesday in eastern India. It then moved east across India, Nepal, Burma, Bangladesh, Bhutan, China, Japan and the Pacific. The eclipse first became total over India at 0053GMT, and was last visible from land at Nikumaroro Island in the South Pacific nation of Kiribati. It ended at 0418GMT. Elsewhere, a partial eclipse was visible across much of Asia. Mixed blessing In India, millions gathered in open spaces from the west coast to the northern plains, with clouds parting in some cities at dawn - just before the total eclipse.But thick clouds and an overcast sky obscured the view at the Indian village of Taregna, "epicentre" of the eclipse, says our correspondent in the area. Many of the thousands of people who gathered there to watch the eclipse left the village disappointed. "We were apprehensive of this cloudy weather but it was still a unique experience with morning turning into night for more than three minutes," scientist Amitabh Pande told the Associated Press news agency. Some enthusiasts in India were on board a special chartered flight for a close-up view of the eclipse. The BBC's Sanjoy Majumder, who was on the flight, said that from a vantage point of 41,000ft (12,500m), it was a celestial spectacle like few others. Among the passengers were a man who was witnessing it for the eighth time, scientists, amateur astronomers and children. In India and Nepal, where it is considered auspicious to watch the eclipse while immersed in holy water, crowds gathered at rivers or ponds, including tens of thousands of people at Varanasi on the Ganges."We have come here because our elders told us this is the best time to improve our afterlife," said Bhailal Sharma, a villager who had travelled to Varanasi from central India. The event in Varanasi was marred, however, when a woman was killed and several others injured in a stampede on the river banks, police said. For others, the eclipse was seen to be a bad omen. In Nepal, authorities shut all schools for the day to avoid exposing students to any ill-effects, says the BBC's Joanna Jolly in Kathmandu. Some parents in Delhi kept their children from attending school at breakfast because of a Hindu belief that it is inauspicious to prepare food during an eclipse, while pregnant women were advised to stay inside due to a belief that the eclipse could harm a foetus.
"My mother and aunts have called and told me stay in a darkened room with the curtains closed, lie in bed and chant prayers," said Krati Jain, a software worker in Delhi who is expecting her first child. Authorities in China, where an eclipse was a bad omen in ancient culture, reassured the public that services would run normally. In the east of the country, heavy cloud or rain obscured it. Pollution was also a barrier, with thick smog in Beijing blotting out the sky. 'Special opportunity' The last total eclipse, in August 2008, lasted two minutes and 27 seconds. Alphonse Sterling, a Nasa astrophysicist who followed the latest eclipse from China, said scientists were hoping data from it would help explain solar flares and other structures of the sun and why they erupt.
"We'll have to wait a few hundred years for another opportunity to observe a solar eclipse that lasts this long, so it's a very special opportunity," Shao Zhenyi, an astronomer at the Shanghai Astronomical Observatory in China told the Associated Press. Solar eclipses allow scientists to see the gases surrounding the sun, or its corona. Solar scientist Lucie Green, from University College London, was aboard an American cruise ship heading for the point near the Japanese island of Iwo Jima, where the axis of the Moon's shadow passed closest to Earth. "The [Sun's] corona has a temperature of 2 million degrees but we don't know why it is so hot," she said. "What we are going to look for are waves in the corona. "The waves might be producing the energy that heats the corona. That would mean we understand another piece of the science of the Sun." The next total solar eclipse will occur on 11 July, 2010. It will be visible in a narrow corridor over the southern hemisphere, from the southern Pacific Ocean to Argentina.
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Neil Armstrong: 'The ultimate peaceful competition' Two of the astronauts who took part in the first Moon landing 40 years ago have called for renewed efforts to send a manned mission to Mars. At a rare public reunion of the Apollo 11 crew, Buzz Aldrin and Michael Collins said Mars instead of the Moon should be the focus of exploration. Neil Armstrong, the first man on the Moon, said the race to get to the Moon had been the ultimate peaceful contest. He said it was an "exceptional national investment" for the US and ex-USSR. The trio spoke at an event at Washington DC's National Air and Space Museum to mark the 40th anniversary of their mission.They are due to meet President Obama at the White House on Monday. Mr Armstrong told the audience: "It was the ultimate peaceful competition: USA vs USSR. "I'll not assert that it was a diversion which prevented a war, nevertheless it was a diversion. "Eventually, it provided a mechanism for engendering co-operation between former adversaries. In that sense, among others, it was an exceptional national investment for both sides." Fellow astronaut Mr Aldrin spoke of the inspiration provided by then-President John F Kennedy which led to the "betterment of America, and ultimately the ending of the Cold War". "Apollo 11 is a symbol of what a great nation and a great people can do if we work hard, work together and have strong leaders with vision and determination," he said.But he also pushed for a mission to Mars: "The best way to honour and remember all those who were part of the Apollo programme is to follow in our footsteps; to boldly go again on a new mission of exploration." Mr Collins, who circled the Moon alone while Mr Armstrong and Mr Aldrin walked on it, said Mars was more interesting than the Moon. "Sometimes I think I flew to the wrong place. Mars was always my favourite as a kid and it still is today." He urged further exploration, saying: "I worry that the current emphasis on returning to the Moon will cause us to become ensnared in a technological briar patch needlessly delaying for decades the exploration of Mars - a much more worthwhile destination." Other Nasa astronauts gave a news conference at Nasa headquarters in Washington DC on Monday. Eugene Cernan, who was the last astronaut to step off the Moon, concurred with the Apollo 11 astronauts urging a new focus on Mars."We need to go back to the Moon, we need to learn a little bit more about what we think we know already, we need to establish bases, put new telescopes there, get prepared to go to Mars. The ultimate goal, truly, is to go to Mars," he told journalists. Mr Cernan said that when he came back from the Moon in 1972, he believed that Nasa would mount a return mission to the lunar surface by 1980 and a manned mission to Mars by the turn of the century. "My glass has been half empty for three decades at least. Hopefully, we can turn that around because what we did then is do-able again," he said. "I think the next major goal is not to spend three days, or three weeks or three months on the Moon, but to have you folks, or your kids, or your grand-kids sit here and talk to a group of guys who can tell you what it was like to go to Mars."
But Mr Aldrin disagreed with the view that astronauts should test capabilities for a long-duration flight on the Moon before attempting a journey to Mars. "Why go to the most difficult place to do that? Why not do it on the International Space Station," he said. The US space agency's currently stated aim is to return astronauts to the Moon by 2020. But that vision is under review, along with the space vehicles that would get them there. Nasa is due to retire its space shuttles next year and replace them with the Orion spacecraft, an Apollo-like capsule that would launch on a new rocket called Ares 1. Another rocket, Ares V, would have the capability to launch heavy payloads - service and cargo modules - that would be needed to service Moon missions. | |
 The carnivorous theropod Banjo is likened to the velociraptor |
Australian palaeontologists say they have discovered three new dinosaur species after examining fossils dug up in Queensland.
Writing in the journal PLOS One, they describe one of the creatures as a fearsome predator with three large slashing claws on each hand.
The other two were herbivores: one a tall giraffe-like creature, the other of stocky build like a hippopotamus.
The fossils date back nearly 100m years to the middle of the Cretaceous period.
They were found in rocks known as the Winton Formation.
Beyond velociraptor
Queensland Museum palaeontologist, Scott Hucknell, said the carnivore, Australovenator wintonensis, was even bigger and more terrifying than velociraptor made famous in the Jurassic Park movies.
"The cheetah of his time, Banjo was light and agile. He could run down most prey with ease over open ground," he told reporters.
The dinosaurs have been named after characters in Australia's famous song, Waltzing Matilda.
The carnivore has been named named after Banjo Patterson, who composed Waltzing Matilda in Winton in 1885, the Sydney Morning Herald newspaper explained.
Clancy, Witonotitan wattsi, was a tall slender animal, while Matilda, Diamantinasaurus matildae, was more stocky and hippo-like.
These two plant-eating, four-legged sauropod species are new types of titanosaurs - the largest animals ever to walk the earth.
Banjo and Matilda - possibly predator and his prey - were found buried together in a 98m year old billabong, or stagnant pond.
Breakthrough
The find was published in the public access journal Public Library of Science One, and was announced by Queensland Premier Anna Bligh at the Australian Age of Dinosaurs Museum of Natural History in Winton.
She said the discoveries were a major breakthrough in the scientific understanding of prehistoric life in Australia.
Museum Victoria palaeontologist, John Long, said the finds were "amazing".
The newspaper quoted him saying that the finds put Australia back on the international map of big dinosaur discoveries for the first time since 1981, when the discovery of Muttaburrasaurus, a large four-legged herbivore that could rear up on two legs, was announced.
The new species will be part of the Australian Age of Dinosaurs Museum of Natural History under construction in Winton. This aims to house the world's largest collection of Australian dinosaur fossils when it is completed in 2015.
The particles smack Iapetus like bugs on a windshield 
