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发布时间: 2025-05-30 12:36:22北京青年报社官方账号
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  郑州飞秒近视手术价格   

Aerospace experts saved the country's first ever manned space mission as the spaceship faced a potentially lethal impact while flying through the communications blackout area before landing, the country's space authorities revealed yesterday.China became only the third country to put a man in space, after the former Soviet Union and the United States, when Yang Liwei orbited the Earth in 2003 in what was a resounding success for its space program.But Xinhua News Agency reported that this was almost not so, quoting the Xi'an Satellite Monitor and Control Center's report on the dangers the Shenzhou V rocket faced."Yang lost every means to communicate with the ground command and control headquarters as he entered the ( Earth atmosphere), which fell in the worst-case scenario prepared by the space mission team," Xinhua quoted Dong Deyi, head of the center, as saying.Communications go down when any spacecraft re-enters the Earth's atmosphere, but in Yang's case, "even radar could not capture any signal from the returning module", Dong was quoted as saying. "After the Shenzhou V came out of the blackout area, the echo signals from the spaceship were still volatile, which sufficiently threatened the safe landing of astronaut Yang."Mission control promptly ordered optical guiding and tracking instead of a communication-guided landing, Dong was quoted as saying."Aerospace technologists used cinetheodolites (optical trackers) on the ground to measure the spacecraft's position and record movements. Precise positioning of the spacecraft enabled officers to properly control the slow-down parachute, which was vital to a soft landing."But the landing was 9 km east of the planned site, Dong said.China began its clandestine manned space program in 1992. The country has since spent at least 20 billion yuan (.64 billion) on the project and sent three astronauts into orbit.Dong also revealed that at least three orbiting satellites were malfunctioning during certain periods, but all had been salvaged by experts since October 2006.The Xi'an center, established on June 23, 1967, in the mountains of Northwest China, has monitored and controlled more than 100 satellites and the six Shenzhou spaceships. According to official records, China now has at least 19 satellites orbiting the earth.China plans to chart every inch of the moon's surface as part of its ambitious space program.China, which plans to launch a lunar orbiter called "Chang'e I" in the second half of this year to take 3D images, would aim to land an unmanned vehicle on its surface by 2010, Zhang Yunchuan, minister of the commission of science, technology and industry for national defense, said on Friday.Xinhua-Agencies

  郑州飞秒近视手术价格   

CHANGSHA -- Central China's Hunan Province said it has taken effective measures to prevent epidemics after about 2 billion rats chomped their way through cropland around the Dongting Lake, the country's second largest freshwater lake. "It's not possible for rodent-borne diseases to break out in the lake area," said Chen Xiaochun, vice director of the provincial health department. Local health authorities have been watching closely over the rodent situation after the rats fled their flooded island homes and invaded 22 counties around the Dongting Lake last week, he told a press conference on Wednesday. Results of their observation are reported daily to the provincial health department and the public, he said. Meanwhile, local health and disease prevention and control authorities have intensified management of raticide and pesticide, for fear they might contaminate food and water, Chen added. No human infection of any rat-borne disease has been reported in the central Chinese province since 1944. The provincial government also ruled out widespread suspicions that rats flooded the area because one of their natural enemies -- snakes -- had been served at dinner tables. "The Dongting Lake area is not an ideal habitat for snakes," said Deng Sanlong, a top forestry official in the province, "and the only two species that inhabitate the region feed largely on fish and frogs." He said the top enemy of the rats are hawks that spend winter in the wetland around the lake but fly away in spring. China's Ministry of Agriculture and the Hunan provincial government have allocated 900,000 yuan in total to eradicate the rats.

  郑州飞秒近视手术价格   

Chinese auditors said it found no embezzlement or misappropriation of construction fund in the ongoing Three Gorges project, however, they also detected some problems and flaws in the project management. The National Audit Office (NAO) said the overall quality control of the project was fine and total investment were kept under control. All 11 major projects were up to the standards, as were main materials such as steel and cement, said an audit report by the NAO. It said total inflation-adjusted investment, expected to be 78 billion yuan, could be more than 35 billion yuan less than planned in 1994. By the end of 2005, the country had spent 64.2 billion yuan on the project. The NAO, however, also detected extra construction costs of 488 million yuan, most of which was incurred by project construction contractors who exaggerated their expenditure. The office also found 20.4 hectares of land illegally used without governmental permission, while another 110 hectares approved for use had been left idle. "The problems are largely due to lack of laws and regulations and imperfection in internal control," said Pan Xiaojun, senior official with the NAO. The company said it had already corrected the use of 139 million yuan of fund involving violation of rules, and a total 17 measures had been adopted to improve management over the project. The office said 21 power station construction projects, most of which involved a single contract value of less than 10 million yuan were not put out to tender. A few construction companies were discovered to have subcontracted their projects against regulations and obtained illegal charge of 53.45 million yuan. About half of the 1,448 supervisors sampled were found to have no licenses for the work. The China Three Gorges Corporation said it had strengthened the implementation of public bidding to ensure the fairness of the results and avoid the influence of people, and it also added detailed terms about contracting in contracts to prevent illegal contracting. The unlicensed supervisors had been fired and supervision over the project supervisors were enhanced, according to the company. The report said that the project across the Yangtze River, the construction of which began in 1993, had played a "better-than-expected" role in flood prevention, power generation and shipping. "It's possible to put the project into full operation by 2009 as planned, and the project is running a bit ahead of schedule," it said. The fourteen generators in a power plant had been put into operation a year earlier than planned in 2005, the office said. Upon its completion, the Three Gorges dam will produce 85 billion kwh of electricity annually for supply to central and eastern China. The dam, which is 2,309 meters long and 185 meters high, will be installed with 26 turbo-generators, each with a generation capacity of 700,000 kilowatts. The audit, which took 150 auditors more than six months to complete, covered areas including fund raising, management and use, construction management as well as benefit of the project.

  

Construction workers toil on the roof of a new building being erected in Beijing April 1, 2007. [Reuters]Stronger-than-expected economic figures have prompted a number of international economic research institutions to revise upwards their forecasts for China's gross domestic product (GDP) growth. Almost all the major economic indexes in the first two months of this year have exceeded those for the same period last year. "The country's GDP growth in the first quarter will be faster than in the equivalent period last year and also that of the previous quarter," Chen Dongqi, deputy director of the Institute of Economic Research of the National Development and Reform Commission, said. The State Information Center has adjusted its GDP growth forecast for the first quarter from 10.2 percent to about 11 percent. Despite the government last year adopting a number of tightening measures, economic growth has shown clear signs of rebounding in the past quarter. Statistics show that urban fixed-asset investment picked up moderately to 23.4 percent year-on-year in January-February, and from about 20 percent in the fourth quarter of last year, reversing the trend of a gradual slowdown since last July. Meanwhile, the trade surplus registered a massive leap of 230 percent, and retail sales were up 14.7 percent on the first two months of last year. "Industrial growth is a key driving force behind overall economic growth, and power generation is also a useful indicator," Chen said. According to the National Bureau of Statistics, China's industrial output rose 18.5 percent year-on-year while industrial profits soared 43.8 percent in the first two months. Growth in power generation also accelerated to 16.6 percent year-on-year from less than 14 percent in the same period last year. Despite expectations the government will introduce another round of tightening measures soon, global investment bank, Lehman Brothers, still revised up its forecast for the Chinese economy. According to a recent report by the firm, the first quarter growth forecast has been raised from 9.8 percent to 10.1 percent, and the annual growth rate from 9.6 percent to 9.8 percent. "In the light of the stronger-than-expected figures in the first two months of this year and the likely policy responses, we have lifted our full-year growth projections for this year to 10 percent from 9.1 percent, based mainly on stronger growth in credit, investment and exports," Qu Hongbin, the chief China economist with HSBC, said. Domestic banks extended new loans of 982 billion yuan (7 billion) in the first two months of this year compared with 716 billion yuan ( billion) in the same period of 2006. The government forecast early last month that the country's GDP is to grow by about 8 percent this year. The country has just witnessed four consecutive years of double-digit growth, including 10.7 percent GDP growth last year, the fastest in a decade. The latest official forecast reflects the authorities' determination to shift the focus of economic growth from quantity to quality.

  

BEIJING - The world's most populous nation began its week-long Lunar New Year holiday on Wednesday, but hundreds of thousands of people will probably spend the biggest festival of the year in the cold and dark.Currently, more than 3,000 people, including electricians, soldiers and armed police are struggling to repair power lines damaged by prolonged snow, rain and sleet to restore the power supply for Chenzhou, a city of about 4 million in central China's Hunan Province, which started its 12th day of power blackouts and water cuts on Wednesday.Staff workers of Hunan Grid repair the collapsed high-voltage power transmission tower in Changsha, capital of South China's Hunan Province, Feb. 3, 2008. [Xinhua] Wednesday marks the eve of Lunar New Year, known as Spring Festival, the most important festival for family gatherings in China with a population of 1.3 billion."Parts of the power lines have been recovered, and power supply will restore gradually for citizens in Chenzhou starting today," said Huang Qiang, vice general manager of the Hunan Electric Power Company under the State Grid Corporation of China.But power service is not expected to be resumed by 6:00 p.m. Wednesday, in eight counties, including Guiyang, Jiahe in Hunan Province, Zixi, Lichuan, Yihuang and Le'an in Jiangxi Province, Pingtang in Guizhou Province and Ziyuan in the Guangxi Zhuang Autonomous Region, the disaster relief and emergency command center under the State Council, China's cabinet, said in a statement late Tuesday.Freak winter weather featuring prolonged snow, rain and sleet since mid-January in China's eastern, central and southern regions has downed power lines, covered roads with thick ice, brought trains, buses and planes to standstill and stranded millions of people.The snow havoc, the worst in five decades, and even in a century in few areas, has led to deaths, structural collapses, blackouts, accidents, transport problems and livestock and crop losses in 19 provinces, municipalities and autonomous regions, according to the Ministry of Civil Affairs.More than 100 million people have been affected, and at least 60 people have died in the freezing weather.

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