Showing posts with label Science. Show all posts
Showing posts with label Science. Show all posts

Thursday, August 11, 2011

China launches first aircraft carrier on maiden sea trial



Color China Photo - In this photo taken on Aug. 6, 2011, a Chinese aircraft carrier, which had been under refurbishment, is docked at Dalian port in in northeast Liaoning province. China's first aircraft carrier …more

China's first aircraft carrier is seen at its shipyard at Dalian Port in northeast …



In this photo taken on Aug. 6, 2011, a Chinese aircraft carrier, which had been under

BEIJING (Reuters) - China launched its first aircraft carrier for a maiden run on Wednesday, a step likely to boost patriotic pride at home and jitters abroad about Beijing's naval ambitions.



The long-awaited debut of the vessel, a refitted former Soviet craft, marked a step forward in China's long-term plan to build a carrier force that can project power into the Asian region, where seas are spanned by busy shipping lanes and thorny territorial disputes.



"Its symbolic significance outweighs its practical significance," said Ni Lexiong, an expert on Chinese maritime policy at the Shanghai University of Political Science and Law.



"We're already a maritime power, and so we need an appropriate force, whether that's aircraft carriers or battleships, just like the United States or the British empire did," he said in a telephone interview.



The carrier "left its shipyard in Dalian Port in northeast Liaoning province on Wednesday morning to start its first sea trial," said the official Xinhua news agency, describing the trip as a tentative test run for the unfinished ship.



The aircraft carrier, which is about 300 meters (984 feet) long, plowed through fog and sounded its horn three times as it left the dock, Xinhua said on its military news microblog.



Xinhua said that "building a strong navy that is commensurate with China's rising status is a necessary step and an inevitable choice for the country to safeguard its increasingly globalised national interests."



Chinese citizens said the carrier launch showed their country deserved more respect from the rest of the world, despite problems it faces at home.



A high-speed train crash last month left many Chinese people bemoaning what they called officials' reckless hunger for passing technological milestones.



"An aircraft carrier is the mark of major powers," Pan Chunli, a 29-year-old IT technician in Beijing told Reuters.



"China has grown dramatically. The whole world should take a fresh look at China, viewing it as a rising power that it has the ability to defend its rights and territory."



Retired Chinese navy Rear Admiral Yin Zhuo told state-run television that his country intended to build an air carrier group, but the task would be long and difficult.



"As for forming a carrier group, I think that will take at least ten years," he told a Chinese television broadcast on the carrier launch.



PRESTIGE AND POWER



Last month, China confirmed that it was refitting the old, unfinished Soviet carrier hull bought from Ukraine's government, and sources told Reuters it was also building two of its own carriers.



"China has had a longstanding fascination with the national prestige attached to aircraft carriers, and this first sea trial may be seen as a crucial step toward the goal of achieving great naval power status," said Chengxin Pan, an expert on China at Deakin University in Australia.



If Beijing is serious about having a viable carrier strike group, however, it will need three carriers, Ashley Townshend at the Lowy Institute for International Policy in Sydney told Reuters in an interview before the debut of the vessel.



China would also have to develop support ships and aircraft for any carrier group, Townshend said.



In China's neighborhood, India and Thailand already have aircraft carriers, and Australia has ordered two multi-purpose carriers. The United States operates 11 carriers.



Before the launch, a Pentagon spokesman played down the likelihood of any immediate leaps from China's carrier program. U.S. experts on the Chinese navy agreed.



"A newly-wed couple wants a 'starter home', a new great power wants a 'starter carrier'," Andrew Erickson of the U.S. Naval War College and Gabriel Collins, a security analyst, wrote in a note about the carrier launch (www.andrewerickson.com).



"China's 'starter carrier' is of very limited military utility, and will primarily serve to confer prestige on a rising great power, to help the military master basic procedures, and to project a bit of power," they wrote.



LONG-STANDING DISPUTES



But the carrier is just one part of China's naval modernization drive, which has forged ahead while other powers tighten their military budgets to cope with debt woes.



"For many neighbors, it may symbolize something different and more unsettling," said Pan, the Deakin University lecturer, referring to China's carrier.



"It is inevitable that neighboring countries will react with some alarm, especially given recent disputes in the South China Sea as well as the maritime incident between China and Japan last year," he said.



China has been building new submarines, ships and anti-ship ballistic missiles as part of its naval modernization.



The country's growing reach at sea is triggering regional jitters that have fed into long-standing territorial disputes, and could speed up military expansion across Asia.



In the past year, China has had run-ins at sea with Japan, Vietnam and the Philippines. The incidents -- boat crashes and charges of territorial incursions -- have been minor, but the diplomatic fallout often heated.



"They want to assert their dominance in East Asia as well as the Chinese sea and they have very ambitious plans of asserting their claims over some islands," retired Indian Major General Ashok Mehta, a defense analyst in Delhi, said of China.



"India has lot of catching up to do and the history of India's catching up is not very impressive," he said, noting New Delhi's plan to have three aircraft carriers by 2015.



Last week, Japan warned that China's naval forces were likely to increase activities around its waters.



But China did not want to rile its neighbors with the carrier debut, said Ni, the Shanghai professor.



"A single, solitary aircraft carrier floating on the sea, without the accompanying forces, doesn't constitute a battle force," said Ni. "It would be a sitting duck if you tried to send it out."



(Additional reporting by Sabrina Mao and Sally Huang in Beijing; Manoj Kumar in New Delhi; Manny Mogato in Manila; Jeremy Laurence in Seoul; Michael Perry in Sydney; and Kiyoshi Takenaka in Tokyo; Editing by John Chalmers) …

Surprise Underwater Volcanic Eruption Discovered



The discovery came as a surprise, as researchers attempted to recover instruments they'd left behind to monitor the peak a year earlier. When the researchers hefted a seafaring robotic vehicle overboard to fetch the instruments, the feed from the onboard camera sent back images of an alien seafloor landscape.



"At first we were really confused, and thought we were in the wrong place," said Bill Chadwick, a geologist with Oregon State University. "Finally we figured out we were in the right place but the whole seafloor had changed, and that's why we couldn't recognize anything. All of a sudden it hit us that, wow, there had been an eruption. So it was very exciting."



In addition to producing hardened lakes of blobby lava, in places more than a mile (1.6 km) across, the eruption changed the architecture of the region's seafloor hot springs.



"There are more vents, they're higher temperature, and there are microbes living in them that are usually deep in the crust that come up to the surface in these events," Chadwick told OurAmazingPlanet.



Eruption predicted



The Axial Volcano rises 3,000 feet (900 m) above the seafloor, the most active of a string of volcanoes along the Juan de Fuca Ridge, a plate boundary where the seafloor is slowly pulling apart.



Chadwick and colleagues have been keeping tabs on the peak since it last erupted in 1998. Thanks to a monitoring system they developed to measure the mountain's minute movements, the team predicted the volcano was due for another eruption sometime between 2011 and 2014.



"So for me, it's a very exciting thing that this worked!" Chadwick said.



The instruments kept track of the movement of the seafloor, which very gradually inflates and deflates like a giant, magma-filled balloon, Chadwick said, collapsing suddenly after an eruption, and rising, in this case, by about 6 inches (15 cm) per year in the lead up to an eruption.



First long-term picture



Scientists have long known about the existence of subsea volcanoes, but information on their behavior is relatively sparse. Eruptions were first observed in the 1990s, and, although technology has improved, getting to the underwater peaks to study them is difficult.



Data from the Axial Seamount's recent eruption will provide the first long-term picture of a subsea volcano from one eruption to the next. [Infographic: Tallest Mountain to Deepest Ocean Trench]



Chadwick said scientists are still trying to figure out how seafloor volcanoes differ from their terrestrial counterparts.



It could be it's easier to predict ocean eruptions, Chadwick said. It's possible that because the crust is thinner there, and magma is in ready supply, the mountains' slow inflations provide a good analogue for knowing when eruptions will occur. However, he cautioned that a single successful prediction wasn’t enough to forecast what the future holds.



"At Axial we've only seen this once, so we don't know for sure it's going to be reliable," Chadwick said. "So we'll certainly keep making these measurements, and hopefully be around to see what happens next."

Tuesday, July 12, 2011

What's Next For NASA?


"As a former astronaut and the current NASA Administrator, I'm here to tell you that American leadership in space will continue for at least the next half-century because we have laid the foundation for success -- and failure is not an option."
Charles Bolden, NASA Administrator
National Press Club, July 1, 2011
The end of the space shuttle program does not mean the end of NASA, or even of NASA sending humans into space. NASA has a robust program of exploration, technology development and scientific research that will last for years to come. Here is what's next for NASA:

NASA is designing and building the capabilities to send humans to explore the solar system, working toward a goal of landing humans on Mars. We will build the Multi-Purpose Crew Vehicle, based on the design for the Orion capsule, with a capacity to take four astronauts on 21-day missions.

We will soon announce the design for the heavy-lift Space Launch System that will carry us out of low Earth orbit. We are developing the technologies we will need for human exploration of the solar system, including solar electric propulsion, refueling depots in orbit, radiation protection and high-reliability life support systems.

International Space Station
The International Space Station is the centerpiece of our human spaceflight activities in low Earth orbit. The ISS is fully staffed with a crew of six, and American astronauts will continue to live and work there in space 24 hours a day, 365 days a year. Part of the U.S. portion of the station has been designated as a national laboratory, and NASA is committed to using this unique resource for scientific research.

The ISS is a test bed for exploration technologies such as autonomous refueling of spacecraft, advanced life support systems and human/robotic interfaces. Commercial companies are well on their way to providing cargo and crew flights to the ISS, allowing NASA to focus its attention on the next steps into our solar system.

Aeronautics
NASA is researching ways to design and build aircraft that are safer, more fuel-efficient, quieter, and environmentally responsible. We are also working to create traffic management systems that are safer, more efficient and more flexible. We are developing technologies that improve routing during flights and enable aircraft to climb to and descend from their cruising altitude without interruption.

We believe it is possible to build an aircraft that uses less fuel, gives off fewer emissions, and is quieter, and we are working on the technologies to create that aircraft. NASA is also part of the government team that is working to develop the Next Generation Air Transportation System, or NextGen, to be in place by the year 2025. We will continue to validate new, complex aircraft and air traffic control systems to ensure that they meet extremely high safety levels.

Science
NASA is conducting an unprecedented array of missions that will seek new knowledge and understanding of Earth, the solar system and the universe. On July 16, the Dawn spacecraft begins a year-long visit to the large asteroid Vesta to help us understand the earliest chapter of our solar system's history. In August, the Juno spacecraft will launch to investigate Jupiter's origins, structure, and atmosphere. The September launch of the National Polar-orbiting Operational Environmental Satellite System Preparatory Project is a critical first step in building a next-generation Earth-monitoring satellite system.

NASA returns to the moon to study the moon's gravity field and determine the structure of the lunar interior with the October launch of GRAIL. In November, we launch the Mars Science Laboratory named Curiosity on its journey to Mars to look for evidence of microbial life on the red planet. And in February 2012, we will launch the Nuclear Spectroscopic Telescope Array to search for black holes, map supernova explosions, and study the most extreme active galaxies.