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BEIJING, Dec. 28 (Xinhuanet) -- China started to run its own satellite positioning system, Beidou, on Tuesday as the country climbed the global tech ladder and challenged the monopoly of the West. Beidou, or Big Dipper, the domestic version of the US Global Positioning System (GPS), started providing navigation, positioning and timing data on a pilot basis to China and the neighboring area for free on Tuesday, Ran Chengqi, director of the China Satellite Navigation Office, said. The system, with 10 orbiting satellites, covers an area from Australia in the south to Russia in the north. Signals can reach the Xinjiang Uygur autonomous region in the west and the Pacific Ocean in the east, Ran said. With six more satellites to be launched next year, the system will cover a wider area and eventually the entire globe by 2020 with a constellation of 35 satellites, he said. The accuracy of the positioning service will also improve as more satellites orbit. During the trial run Beidou can offer positioning to within 25 meters but when the system is officially launched next year accuracy will be enhanced to within 10 meters, he said. With the system operational China is the third member of an elite group, along with the US and Russia, to develop a satellite navigation system. The US spent 20 years and more than billion on the GPS. Completed in 1994, the system has 24 navigation satellites and is widely used around the world. Beidou has its own unique features, Ran said. "It not only tells users where they are and what time it is but also allows users to tell others the information through short messages," Ran said, adding that this feature is being considered by other systems. Russia's Glonass system achieved a 24-satellite constellation in 1996 but succumbed to funding problems. The rebuilding of the Glonass system is almost finished and Russian media reported that the system resumed service earlier this month. The European Union and the European Space Agency are building the Galileo satellite navigation system. Japan and India also intend to build independent regional navigation systems. "Countries build their own systems because owning an independent satellite navigation system is important to economic development and national security," said Pang Zhihao, deputy editor-in-chief of the monthly publication Space International. There have long been concerns that the US might take its dominant GPS offline in certain international emergencies. Ran said that the Beidou system will be "helpful" to national defense. An "independent and controllable" satellite navigation system can guarantee national economic development as well as scientific and industrial strength, he said. China started to reduce its reliance on the GPS in 2000, when it sent an experimental pair of positioning satellites into orbit. But Ran stressed that Beidou is "built for the world", as the compatibility of various systems enhances reliability for users. "If you only use GPS there will be blind spots. But from demonstrations I saw recently, receivers that are compatible with Beidou will overcome these problems," he said. He encouraged enterprises at home and abroad to join the research and development of application terminals compatible with Beidou. The office put a test version of the system's Interface Control Document online on Tuesday, which is a technical document vital for the manufacturing and development of receivers and chips. The prospects for the country's satellite navigation industry look bright, experts said. Analysts estimated that around 2020 the industry's output will reach 0 billion globally, including 400 billion yuan ( billion) to 500 billion yuan from China. According to the 2011 Report on Application of Geosaptial Information in China released on Monday, the number of satellite navigation application terminals in China has grown from less than 100,000 in 2000 to more than 10 million in 2009. The number is expected to reach 340 million by 2015. An insider said a compatible receiver for car use costs 1,600 yuan to 3,000 yuan, higher than a GPS receiver. "Chips supporting both GPS and Beidou systems have been developed, and terminals have been produced. There are no technical hurdles for the industry," said Han Shaowei, CEO of Beijing-based Unicore Communications Inc, a major navigation chip and core component provider. Beidou application terminals have been put into use in vehicles, such as government cars in Guangdong province. Ran said that private terminal makers in Guangdong are testing their receivers on the road, and the products seem stable. "The price of the compatible terminals is expected to be slashed next year," he said.

BEIJING, Oct. 26 (Xinhuanet) -- The question, why the first documented supernova was super-sized and grew so fast, has puzzled astronomers for centuries. Now it is solved by US researchers.The supernova, an exploded star, was observed in 185 A.D. and documented as a mysterious "guest star" by Chinese astronomers. It was visible for eight months.Scientists later found the supernova, 8,000 light years away, was a bigger-than-expected supernova remnant. BBC reported that if the infrared light it emits could be seen by human eyes, it would appear to be as large as the full Moon in the sky.Through observations in space telescopes, researchers of a latest study revealed that the explosion took place in a cavity in space, which allowed the star's remains to travel out much faster and farther. The study was published online in the Astrophysical Journal Monday.The supernova was "two to three times bigger than we would expect for a supernova that was witnessed exploding nearly 2,000 years ago. Now, we've been able to finally pinpoint the cause," stated Brian Williams, lead author of the study and an astronomer at North Carolina State University in Raleigh.

SAN FRANCISCO, Dec. 29 (Xinhua) -- The United States Patent and Trademark Office on Thursday published a patent application from Apple related to face and presence detection for iOS devices, which is expected to be one of the next chapters for mobile security.According to AppleInsider, a news and rumor website focusing on Apple, the patent is entitled "low threshold face recognition" which is a low-computation solution for quickly and accurately recognizing a user on iPhone, iPad, iPod Touch and MacBook.Patently Apple, a blog focusing on Apple's latest intellectual properties, said that iOS devices would acknowledge the presence of the potential user by turning on the display and then trigger a subsequent process for recognizing the potential user's face.Currently, most face recognition systems tend to be robust ones working in various lighting conditions, orientations, scale and etc., which will require computing resources and drain battery life. There are also security-type face recognition systems working under controlled lighting conditions which could be ineffective due to factors like proximity of the user to the camera.Google's latest Android 4.0 operating system, codenamed Ice Cream Sandwich, already features face detection. But it is reported that the feature doesn't always work and can be bypassed by using a photograph of the phone's owner.Apple's solution would reduce the impact of lighting conditions and biometric distortions on an image, said AppleInsider, citing the filing. Apple said it would rely on a "high information portion" of a human face, such as eyes, mouth or the tip of a user 's nose.The "likely presence" of a human face in front of the camera would be captured through an "orange-distance filter" which would also be used to detect the potential user's skin tone and measure the distance of their face from the camera.Meanwhile, iOS devices could also be set to recognize faces of multiple users, presenting each user with a personalized configuration.According to AppleInsider, the patent application was first filed by Apple in June, 2009.Analysts said that the proposed technology could be Apple's next big innovation as it has record of redesign and give its unique appeal to products that have not caught on with the general public.

BEIJING, Nov. 19 (Xinhua) -- China on Saturday again called for appropriately addressing the alleged plot to assassinate the Saudi Arabian Ambassador to the United States.Foreign Ministry Spokesman Liu Weimin made the remarks in a written statement in Beijing.The UN General Assembly on Friday adopted a resolution titled "Terrorist Attacks on Internationally Protected Persons," expressing deep concern over the assassination plot and calling on Iran "to comply with all of its obligations under international law."Liu said China abstained from the vote on the resolution, because the case is highly complicated and sensitive at present and relevant parties still have different views on the issue.He said any conclusion or action must be based on comprehensive, impartial, objective and transparent investigation and substantial evidence."Before facts are checked out, parties should adopt a prudent attitude, refrain from jumping to conclusions, and avoid actions that may complicate and worsen the situation," he said.He said China hopes those countries concerned will continue to appropriately address the issue through dialogue and make joint efforts to maintain peace and stability in the Middle East and the Gulf Region.Liu also reaffirmed that China opposes all forms of terrorism, and always stands for compliance with international law and the basic norms governing international relations in handling state-to-state relations as well as the effective protection of the safety of diplomatic personnel.Chinese Permanent Representative to the United Nations Li Baodong previously addressed the UN General Assembly on Friday in order to explain China's position on the issue after he abstained from voting on the draft resolution.

BEIJING, Oct. 24 (Xinhuanet) -- Thirty-year-old Chen Liang acquired his iPhone 4S in a relatively straightforward way without visiting the gray market. He typed "Looking for an iPhone 4S through weibo" on the Chinese equivalent of Twitter at 9 am on Oct 17 and secured one by 2 pm that day.The software engineer was lucky. Thousands of Chinese Apple fans are desperate for the 4S regardless of the price and effort required after China was left out of Apple's list of first and second groups of countries where it launched its latest product."A friend's friend in Canada put me in contact with a supplier and I'm getting one for just 5,500 yuan (9). Unauthorized Apple retailers are setting their floor price at 8,000 yuan," said Chen, from Jiangsu province.A proud Apple customer shows off the new iPhone 4S he purchased at an Apple store in Munich, Germany."I need to have one because I see the potential of its cloud computing service and artificial intelligence application. That's currently a wide open area in China. Simply speaking, other smartphones allow you to access search engines while the 4S's cloud search using Siri - a voice recognition and talking assistant - helps to filter irrelevant results and makes suggestions for you. My work-related curiosity drove me to get one because it is the future for phones."Jin Jianhan, who works at a Shanghai-based IT company, says he will do whatever it takes to get a 4S because "it's very important to get an Apple product when it's first launched".Jin plans to contact his friends in the United States to see whether they can send him one and to keep an eye on the Hong Kong market in case the special administrative region gets the green light to sell the devices in the third round of agreements."I'd try both ways and go for the overseas one first even it won't cover my domestic Apple guarantee," said Jin. "I will take the Hong Kong 4S when it's available to replace the American one."In its first round of agreements, Apple launched the iPhone 4S in the United States, Canada, Australia, the United Kingdom, France, Germany and Japan. Apple said on Oct 17, the third day after its release, that more than four million iPhone 4S devices had been sold. That figure is more than double the 1.7 million units of the iPhone 4 that Apple sold during its first three days on the market in June last year.The second group of countries to be licensed were mostly other European states. They will get the product by the end of October. Apple China refused to give a date for when it will be sold on the mainland.Meanwhile, Apple fans all over the world are paying their respects to Apple guru Steve Jobs by snapping up the iPhone 4S in record numbers. Wang Bo, who works as an industrial designer in Sydney, Australia, reserved his at a local store."It's the last Apple product that he (Steve Jobs) ever worked with," said Wang. "I'm buying it as a souvenir."In Huaqiangbei, an area in Shenzhen known for its many consumer electronics shops, unauthorized Apple dealer Zhou Bin has been happy to work overtime since the night of Oct 15, the first day that he received supplies of the iPhone 4S.

来源：资阳报