濮阳东方妇科评价(濮阳东方医院妇科做人流非常好) (今日更新中)

LOS ANGELES, April 7 (Xinhua) -- Using NASA's Galaxy Evolution Explorer (GEE) satellite, U.S. astronomers are hunting for nearby, hard-to-see stars which could very well be home to the easiest-to-see alien planets, it was announced on Thursday.U.S. astronomers are ferreting out the new targets after the glare of bright, shining stars has frustrated most efforts at visualizing distant worlds, NASA's Jet Propulsion Laboratory (JPL) said.So far, only a handful of distant planets, or exoplanets, have been directly imaged. Small, newborn stars are less blinding, making the planets easier to see, but the fact that these stars are dim means they are hard to find in the first place."Fortunately, the young stars emit more ultraviolet light than their older counterparts, which makes them conspicuous to the ultraviolet-detecting GEE," JPL said in a press release."We've discovered a new technique of using ultraviolet light to search for young, low-mass stars near the Earth," said David Rodriguez, a graduate student of astronomy at University of Californian, Los Angeles. "These young stars make excellent targets for future direct imaging of exoplanets."Young stars, like human children, tend to be a bit unruly -- they spout a greater proportion of energetic X-rays and ultraviolet light than more mature stars. In some cases, X-ray surveys can pick out these youngsters due to the "racket" they cause. However, many smaller, less "noisy" baby stars perfect for exoplanet imaging studies have gone undetected except in the most detailed X-ray surveys. To date, such surveys have covered only a small percentage of the sky, according to JPL in Pasadena, Los Angeles.Rodriguez and his team figured that the GEE, which has scanned about three-quarters of the sky in ultraviolet light, could fill this gap.Astronomers compared readings from the telescope with optical and infrared data to look for the telltale signature of rambunctious junior stars. Follow-up observations of 24 candidates identified in this manner determined that 17 of the stars showed clear signs of youth, validating the team's approach, JPL said."The Galaxy Evolution Explorer can readily select young, low- mass stars that are too faint to turn up in all-sky X-ray surveys, which makes the telescope an incredibly useful tool," Rodriguez said in the release.

TOKYO, March 20 (Xinhua) -- Traces of radioactive iodine had been detected in Tokyo and the surrounding Kanto region, according to the results of an investigation of radioactivity in precipitation and dust conducted by the government, local media reported on Sunday.Radioactive iodine was found in Tokyo, Saitama, Chiba, Yamanashi, Tochigi and Gunma prefectures, the Kyodo News said, citing the Ministry of Education, Culture, Sports, Science and Technology. The ministry added that the levels detected in the investigation alone would not affect human health.An employee of Yamagata city office holds a Geiger counter to detect radiation when evacuees from the vicinity of Fukushima nuclear plant wish to be screened upon their arrival at an evacuation centre set in a gymnasium in Yamagata, northern Japan March 19, 2011, eight days after Japan's devastating earthquake and tsunami.The investigation was carried out following the nuclear crisis at the Fukushima Daiichi nuclear power plant, the government said Sunday.The ministry said that a separate research has already shown that radioactive materials in the air and tap water in Tokyo and the five prefectures pose no threat to human health, according to Kyodo News report.

CANBERRA, May 10 (Xinhua) -- Technology may have a harmful effect on children's development and creativity, Australia's report found on Tuesday.The Pilot Pen Australia Creativity Report found that children could be depending too much on technology such as computers.Written by psychologist Kimberley O'Brien, the report suggested that students are becoming scared of handwritten tasks as there is no spelling or grammar check tool to pick up their mistakes as they go along."Children who develop this kind of dependency on computer software are less likely to write using a pen and paper given that they will feel a vulnerability to failure," the report said.It said using software that immediately tells children to correct errors like spelling and grammar could disrupts their thought patterns and stunts their ideas, and children who hand write are able to produce almost twice as many ideas as those using computer technology to write a creative story.The report studied 300 Year five and six children, and found handwritten essays were completed significantly faster and contained a higher standard of sentence structure, grammar, punctuation, cohesion, ideas development and organization than those completed using keyboards.A further study found students in Years two, four and six produced up to twice as many ideas writing on pen and paper as those on computers.O'Brien said the results were due to computers putting extra pressure on writers to edit as they go rather than get their ideas down first and edit minor mistakes later.O'Brien said children were most likely to develop their handwriting skills between the ages of eight and 10, and she urged all teachers and parents to ensure their children met community standards for legible handwriting.However, she said that computers are a good support tool, and they should not replace handwriting entirely.

来源：资阳报