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Posted 10 June 2009 - 04:13 AM
Posted 03 July 2009 - 02:01 AM
waistlines temporarily, which possibly explains why some gas giants are unexpectedly large.
"Astronomers have power leveling found a lot of planets whose
sizes cannot be explained by standard theory," says Laurent Ibgui of Princeton University. The difference
between predicted and measured widths of so-called "hot Jupiters" can be 30 per cent or more.
Previously, astronomers assumed that, because cold gas takes up less volume than hot gas, hot Jupiters would
shrink as they lost their initial heat.
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Now a computer simulation by Ibgui suggests this effect can be temporarily halted in hot Jupiters that begin
life in highly elliptical orbits. These planets are alternately squeezed and stretched as they circle their
stars, resulting in "tidal heating" that warms the gas inside the planet. This counteracts the cooling
effect, inflating the planet - an effect that can last for a billion years or more. Eventually, though, the
planet's orbit will become more circular, and the hot Jupiter resumes shrinking. Ibgui presented the research
at an American Astronomical Society meeting in Pasadena, California, last week.
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The model doesn't quite explain the superpuffy appearance of all hot Jupiters, says Jonathan Fortney of the
University of California, Santa Cruz. "It requires these planets to start their lives on very eccentric
orbits, which is possible, but not currently the preferred scenario."
Posted 12 October 2009 - 08:04 AM
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The detention came after several needle attacks had been reported to local police since late last month. The needle attacks in Xi'an followed similar attacks in the Xinjiang Uygur autonomous region.
The suspect, Wang Xing, 26, a male villager in Liucun village of Chang'an district, pricked a female college student's back with a needle-like bamboo stick on Sept 12 in a downtown street of the district, said Liu Liju, a police officer with the publicity section of Chang'an district public security bureau, in an interview with China Daily.
"The suspect confessed his criminal acts and we requested approval from the municipal procuratorate to arrest the suspect on Tuesday," Liu said.
The student suffered a minor injury and is doing fine now, police said.
3 sentenced over needle attacks in Urumqi
Suspects sentenced over needle attacks in Urumqi
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Several needle attacks have been reported since late last month, said Qian Baiyun, director of the publicity department of Xi'an public security bureau.
His bureau has sent more than 2,400 policemen to patrol downtown areas around the clock to keep public order and search for any potential criminals.
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Starting Sept 13, every bus in the city will be checked by policemen with police dogs before it begins operation every morning. More than 5,000 plain-clothes police and security staff will be on duty on every bus to guard its safety, Qian said.
Local police also announced that they will crack down on the needle attacks, which are considered a serious criminal activity, according to the law.
The police said in a statement that those who have carried out needle attacks should give themselves up to police as soon as possible. Those who do will receive a reduction in or exemption from punishment if they report and expose other attackers.
Those who received the needle-like pricks are showing no obvious trauma or any other complications, the police said.
Ma Zhonglin, deputy director of Xi'an public security bureau, said that his bureau had taken strict measures to ensure social order and has worked hard to track down criminals as soon as possible.
"And we should remind local residents to heighten their vigilance and strengthen their own security precautions. But they should remain calm and report to police when they find any suspects," Ma said.
Wu Kejun, a local resident, said that he did not think the so-called needle attacks would destroy public order. Most people believe the police will keep good public order in the city.
Xi'an municipal public security bureau has set up a special police hotline for the needle attacks and promised to reward those who provide clues and information to crack the cases or catch the suspects.
In order to keep order to usher in the coming National Day holiday from Oct 1 to 8, the Xi'an police bureau put some 14,000 policemen into a high state of alert and organized more than 38,000 militias, security volunteers and information staff to guard shops and markets, communities and schools.
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