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QINGDAO, Shandong, Dec. 26 (Xinhua) -- China's largest rail vehicle maker, CSR Corp. Ltd, over the weekend launched its first test train that features speeds reaching up to 500 km per hour.The six-car train with a fairshaped head is the newest in the CRH series. It has a maximum tractive power of 22,800 kilowatts, compared with 9,600 kilowatts for the CRH380 trains currently in service on the Beijing-Shanghai High-Speed Railway, which hold the world speed record of 300 km per hour.The grey-color train carrying testing and data processing facilities was designed and produced by CSR Sifang Locomotive & Rolling Stock Co., Ltd (Sifang Locomotive), a CSR subsidiary based in the coastal city of Qingdao in eastern Shandong province.Ding Sansan, the company's chief technician, said the concept of the the super-speed train design was inspired by China's ancient sword. The bodywork uses plastic materials reinforced with carbon fiber.Shen Zhiyun, a locomotive expert and academician with both the Chinese academies of sciences and engineering, said the testing of the super-speed train with speeds of up to 500 km per hour will provide useful reference for current high-speed railway operations.

WASHINGTON, Jan. 2 (Xinhua) -- A systematic review of previous studies suggests that there may be a positive connection between physical activity and children's academic performance, according to a report published Monday in the Archives of Pediatrics & Adolescent Medicine.A group of scientists at the Vrije Universiteit (Free University) Medical Center in the Netherlands reviewed evidence on the relationship between physical activity and academic performance because of concerns that pressure to improve test scores may often mean more instructional time for classroom subjects with less time for physical activity.The authors identified 10 observational and four interventional studies for review, 12 of which were done in the United States, one in Canada and one in South Africa. Sample sizes ranged from 53 to about 12,000 participants between the ages of eight years and 18 years old. Follow-up varied from eight weeks to more than five years."According to the best-evidence synthesis, we found strong evidence of a significant positive relationship between physical activity and academic performance. The findings of one high-quality intervention study and one high-quality observational study suggest that being more physically active is positively related to improved academic performance in children," the report said.Background information in the article suggests that exercise may help cognition by increasing blood and oxygen flow to the brain, increasing levels of norepinephrine and endorphin to decrease stress and improve mood, and increasing growth factors that help create new nerve cells and support synaptic plasticity."More high-quality studies are needed on the dose-response relationship between physical activity and academic performance and on the explanatory mechanisms, using reliable and valid measurement instruments to assess this relationship accurately," the report concluded.

TEHRAN, Oct. 9 (Xinhua) -- Iran is going to launch domestically- built Navid satellite by Safir satellite launcher by the end of March 2012, the semi-official Mehr news agency reported on Sunday.Navid (promise) is a research satellite and is currently undergoing pre-launch tests, said the report without further details.In June, Iran put the Rasad (surveillance) satellite in the orbit to render images to the country.Iran put a satellite into orbit in 2009 and sent some small animals into space in 2010. It plans to send man into space by 2020.

PHNOM PENH, Oct. 3 (Xinhua) -- Cambodia reported on Monday that some 54 Cambodian children had been killed by dengue fever in the first nine months of this year, compared to 37 kids dying of the disease in the whole year of 2010.From January to September this year, some 12,392 cases of dengue fever had been reported with 54 children killed by the disease. The whole year 2010 reported only 5,497 cases, Ngan Chantha, director of dengue control at the Ministry of Health, said on Monday."This year's rainy season has been plagued by floods, leading to more cases of the disease," he said. "I would like to appeal to parents to let their children sleep under mosquito nets and if their kids have any symptom that is suspicious of the disease, they should urgently send them for medical attention."Dengue is caused by mosquitoes. The disease causes an acute illness of sudden onset that usually follows symptoms such as headache, fever, exhaustion, severe muscle and joint pain, swollen glands and rash.In Cambodia, the outbreak of dengue fever usually begins at the onset of the rainy season from May to October. 

SAN FRANCISCO, Jan. 13 (Xinhua) -- Google seems to get no blessings for a good start for its New Year resolutions as the Internet search giant got an earful of complaints about its new social search service and felt mortified by a customer-poaching scandal in its Kenyan division.On Tuesday, Google announced "search plus your world" to deliver personalized search results by embedding its social service Google+ to its search engine.Although Google called it as "a beautiful journey begins," competitors and industry watchers said it was "a bad day for the Internet." They accused the company of using its dominant search engine to promote its own social networking site by giving Google+ pages and profiles an artificially prominent position in search results.The search giant first had a public bickering with Twitter which issued a statement on Tuesday saying that "As we've seen time and time again, news breaks first on Twitter. We're concerned that as a result of Google's changes, finding this information will be much harder for everyone."Google on Wednesday made a statement on its official Google+ page, saying that "We're a bit surprised by Twitter's comments because they chose not to renew their agreement with us last summer." The agreement, in which Twitter gave Google access to public tweets, expired last July and was not renewed.Twitter fired back by demonstrating the inefficiency of the new Google search feature. Twitter general counsel Alex Macgillivray tweeted a page of Google search results for the search term "@WWE" which did not include World Wrestling Entertainment's Twitter page, but Google+ page.Macgillivray noted that with 792,642 followers on Twitter compared with 24,900 followers on Google+, WWE's Twitter page is a more relevant social source than Google page and should be presented in Google's search results.Facebook, Google+'s major rival, has been remaining silent this week publicly while its employees criticized Google's moves in public status updates. Several prominent Facebook engineers and directors shared a tech blog about switching default search engine to Microsoft's Bing after "Google broke itself."Facebook has been working with Microsoft to allow Bing to reveal more personalized content.Industry watchers are also crying foul at the privacy and antitrust concerns raised by the new search feature. Search Engine Land, a tech blog closely following Google's news, posted several examples of how Google favors its own social networking service.Industry watchdog Electronic Privacy Information Center told the Los Angeles Times that the group is considering filing a complaint with the U.S. Federal Trade Commission (FTC). The organization once made the complaint that resulted in Google's settlement with the FTC last year that requires the Mountain View, California-based company to submit to external audits of their privacy practices every other year.On Friday, a Kenyan business directory startup Mocality said that Getting Kenyan Businesses Online, a Google-backed initiative to give small businesses free websites for one year, routinely accessed Mocality's database to obtain sales leads.The Search giant's Kenyan division called Mocality customers to pitch Google's alternative service, claiming they have had a partnership with Mocality. Mocality CEO Stefan Magdalinski said there is no such partnership.In a statement sent to the U.S. media, Google said it is " mortified" to learn that a team representing Google improperly used Mocality's data and misrepresented their relationship with the Kenyan company, noting that it "unreservedly apologized to Mocality" and is still investigating the issue.On Monday, BBC revealed that Google admitted profiting from advertisements of illegal websites selling drugs, fake passports and unauthorized tickets for the 2012 Olympics.The ads had been removed by Google after they were brought to the company's attention, but the search giant told BBC that the company "keeps any money it might make from companies advertising illegal services before such ads are removed."Meanwhile, on Thursday, Microsoft announced it has signed a patent licensing agreement with LG Electronics on the manufacturer 's devices running Google Android platform, leaving Motorola Mobility the only major Android-powered device maker that refuses to strike a deal with Microsoft.After the announcement, Microsoft's directors have been taking to Twitter to taunt Google as the two companies had a history of public back-and-forth. But so far, it appeared that Google didn't have time to needle back.