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发布时间: 2025-05-24 11:25:15北京青年报社官方账号
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  昌吉哪个医院治阳痿早泄好   

JERUSALEM, Dec. 11 (Xinhua) -- Kfir Damari, a communication systems engineer, has a dream: to land a miniature spacecraft on the moon sometime in 2013.Damari is one of the founders of Team SpaceIL, a non-profit organization representing Israel in the Google Lunar X Competition. The prize: 20 million U.S. dollars to the first of the 26 international teams currently registered that lands an unmanned craft on the moon, moves it a minimum of 500 meters across the lunar surface and transmits live high-resolution images back to earth."It's a tough mission, but I believe that if everyone in Israel joins hands it's possible," Damari told Xinhua.It is exactly the kind of entrepreneurial spirit that Israel, a country largely void of natural resources, counts on to make it a global leader in technological innovation.The two other men behind the initiative are Yonatan Winetraub, 25, a systems engineer at Israel Aerospace Industries (IAI) and a graduate of NASA's International Space University, and Yariv Bash, 31, a computer scientist and electronics engineer. The three first met at an innovation conference held by IAI a year ago.They describe the lander as a nano-satellite, whose design was revealed at the project's official inauguration ceremony on Thursday. The vessel weighs 100 kg, 80 percent of which are fuel, and is outfitted with rocket boosters and a panoramic camera."It's somewhat of a cellular phone sitting on a large fuel tank. All the technology that we require is basically contained in a typical smartphone with its communication and imaging features," Damari said.Launched in 2007, the Lunar X Prize aims to encourage space enthusiasts and engineers worldwide to develop cheap technologies for robotic space exploration.The Israelis have slated a modest 15 million U.S. dollars for the endeavor, 90 percent of which must come from private contributions according to the competition's rules. They have already raised 3.5 million dollars.The fact that they have formed a non-profit NGO in itself is worthy of praise. Most other teams have obtained the patronage of private corporations for whom money is not a problem, with some reportedly allotting up to 100 million U.S. dollars.To compensate for the disparities in funding, Damari and his partners have enlisted the support of 120 local volunteers, many of them engineers holding top positions in the technological and scientific community as well as the country's leading defense industries.Rona Ramon, the widow of Israeli astronaut Ilan Ramon killed aboard the Columbia Space Shuttle in 2003, was one of the sponsors too.In a bid to keep costs down, SpaceIL is heavily relying on the existing knowledge accumulated by Israel's defense industries over the past decades in building and launching mainly small, lightweight communications and military surveillance satellites into space.The challenge, Damari said, is to take that know-how a step further. The professionals who have volunteered for the project, among them some of Israel's most revered space experts, are currently grappling with several issues, including the ignition system, optic-visual navigation, beaming imagery to earth and the intricacies of enabling the nano-satellite a smooth lunar landing.SpaceIL is still searching for a third party that they will lease to launch their vehicle into space. Once there, they will have to navigate it to the moon on their own.While 20 million U.S. dollars is a major motivator for anyone, the Israelis said they're not seeking personal gain, but rather plan to invest the prize money in the vision that originally prompted their registration in December last year: inspiring the country's younger generation to pursue engineering and the sciences and to dream big, just like Neil Armstrong did when he disembarked from the Apollo 11 and took the first step on the moon in 1969.The funds, they said, will be funneled to educational programs that seek to rejuvenate youths' interest in science disciplines, which have been on the decline in the country's high schools in recent decades."We hope to attract the next generation of kids, to enable them to be engineers and scientists and to make sure that we have more people that can build spaceships in Israel in the future," said Damari.He and the other men behind the initiative also acknowledge that their motives are no less driven by patriotism. Winning the Lunar X has the potential to create national pride and put Israel "on the map as a start-up nation" by accomplishing a feat reserved for superpowers."The moon is something you see every day. I think that for me personally, space exploration is the way to enlist the nation to do something that has not yet been done," said Damari, who started programming aged six and wrote his first computer virus aged 11."It's also about exploring new borders, going the distance. (The project) will leverage Israel's space industry. I'm sure that all the industries that will partner with us will learn a lot and develop new applications, especially for the civilian market," he said.On Thursday, Israeli President Shimon Peres, whose name has become synonymous with the nation's hi-tech industries, honored the trio by unveiling their model at the ceremony held at MABAT -- IAI's missiles and space division near Tel Aviv."More than Israel is leading technology, it is likely to lead Israel. It's the key to our economy ... If they win the prize, and I'm sure they will, it will also reward Israel with the deepest appreciation and the best deterrence," Peres told a crowd of senior executives from local defense industries."I admire your audacity and vision," he complimented the three scientists.Will they realize their ambition? Damari expressed humble optimism, "It's not easy, but certainly possible ... We believe we can win."

  昌吉哪个医院治阳痿早泄好   

WASHINGTON, Oct. 6 (Xinhua) -- The U.S. Food and Drug Administration (FDA) and the National Institutes of Health (NIH) announced Thursday a joint, large-scale, national study of tobacco users to monitor and assess the behavioral and health impacts of new government tobacco regulations.The initiative is the first large-scale NIH/FDA collaboration on tobacco regulatory research since the U.S. Congress granted FDA the authority to regulate tobacco products in an act in 2009. Scientists at NIH's National Institute on Drug Abuse and the FDA's Center for Tobacco Products will coordinate the effort."The launch of this study signals a major milestone in addressing one of the most significant public health burdens of the 21st century," said FDA Commissioner Margaret Hamburg in a statement. "The results will strengthen FDA's ability to fulfill our mission to make tobacco-related death and disease part of America's past and will further guide us in targeting the most effective actions to decrease the huge toll of tobacco use on our nation's health."Investigators will follow more than 40,000 users of tobacco- product and those at risk for tobacco use ages 12 and older. They will examine what makes people susceptible to tobacco use; evaluate use patterns and resulting health problems; study patterns of tobacco cessation and relapse in the era of tobacco regulation; evaluate the effects of regulatory changes on risk perceptions and other tobacco-related attitudes; and assess differences in attitudes, behaviors and key health outcomes in racial-ethnic, gender, and age subgroups."We are pleased to collaborate with the FDA on this study that may provide us with a better understanding of the impact of product regulation on tobacco prevention and cessation," said NIH Director Francis Collins.While smoking rates have dropped significantly since their peak in the 1960s, nearly 70 million Americans ages 12 and older were current users of tobacco products in 2010. As a result, death and disease caused by tobacco use is still a tremendous public health burden. Tobacco use is the leading preventable cause of disease, disability, and death in the United States. Cigarette smoking results in more than 443,000 premature deaths in the United States each year -- more than alcohol, illegal drug use, homicide, suicide, car accidents, and AIDS combined.

  昌吉哪个医院治阳痿早泄好   

BEIJING, Dec. 30 (Xinhua) -- China will push to properly resolve the case of a Chinese skipper indicted by Japan, the Foreign Ministry said Friday.Spokesman Hong Lei said this is a common fishing case, and the Chinese embassy in Japan has dispatched officials to visit the skipper.China requests that Japan ensure the rights of the Chinese skipper, Hong said, and China is communicating closely with Japan in order to properly resolve the case.The Chinese government has been requiring fishermen to fish legally, Hong said, adding that the competent authorities have done a lot in this area, and he promised to promote the management and education of Chinese fishermen.Japanese prosecutors have indicted the captain of a Chinese fishing boat for illegally operating in Japanese waters, a local official said Friday.The Nagasaki District Public Prosecutors Office has finalized its case against Zhong Jinyin, 39, following his December 20 arrest near islands off southwest Japan, according to the official.The prosecutors have not indicated whether the skipper has admitted to the charge.

  

BEIJING, Oct. 3 (Xinhuanet) -- Ziqian (not his real name, but an avatar he uses online) is in Paris working on his master's degree, but he stays in close touch with his contacts in China through Sina Corp's Weibo, a micro blog platform. It was a pleasant way to keep up with acquaintances. But that all changed when Ziqian quoted a blog post from an alumnus of his alma mater, Nanjing University, on July 5. It said the school did not organize students to sing Red songs ahead of July 1, the 90th anniversary of the founding of the Communist Party of China. Ziqian suddenly found himself inundated with comments from enraged bloggers whom he didn't know. He had lost all integrity, they said.Ziqian spent the whole night arguing with one netizen who assailed him with insults. He was left feeling tired and puzzled.He said he would have given up micro-blogging altogether as "purely useless", but he uses it to stay in touch with his girlfriend.Micro-blogging has been growing rapidly, dwarfing the many other forms of social networking that came into being only three or four years ago.Famed for spreading messages almost instantly and supervising the doings of agencies and organizations, micro blogs have already won some notable battles.In March, micro-bloggers persuaded the city of Nanjing, Jiangsu province, to spare 600 old trees that were to be cut down; they also organized assistance to earthquake victims in Japan.In July, they brought the Red Cross Society of China and other philanthropies under scrutiny.But, like everything in life, there is also a downside to micro-blogging.In the Weibo-dominated virtual world, Ziqian's experience has proved a common occurrence. A 28-year-old woman, surnamed Zhang, who declined to disclose her full name, works at a TV station in Jiangsu province. She recounted her recent encounter with online abusive remarks.After watching a popular talent show, Zhang wrote half-jokingly online - without using her real name - that the program was boring and lacked imagination. Regarding herself as an "industry insider", Zhang believed her reasoning had some objective basis.Nevertheless, she was soon confronted with a wave of criticism, some of it vulgar, saying she had no appreciation for the arts."I was very depressed by the comments. It's like you get kidnapped by mainstream opinion," she said. "I lost the desire to share my views with others.""I respect the freedom of speech doctrine, and everyone is allowed to publicize his or her thoughts," Zhang wrote in a separate post. "But don't hurl random assaults at others and take for granted that whatever you say is truth."Micro blogs have also made some ordinary people famous, though not in the way they would like.Zhang Mingyi, 22, is one such person.After appearing on a dating show on Shanghai-based Dragon TV, she said her micro blog inboxes were filled every day with letters lashing out at her, because of her open enthusiasm for Japanese culture and a failed marriage.Some netizens are relentless in their resentment of her. Even her micro blog followers received warnings to stay away from the "quisling". One such message read: "Go tell her to marry a Japanese man. Don't act so shamelessly in China".Similarly, Guo Meimei, now a household name, said she was being stalked and even threatened in early September, after she bragged in a micro blog post about her wealth and - untruthfully - claimed to hold a position at the Red Cross Society of China.Bloggers launched a vast campaign boycotting a song she released online and an online game she endorsed. They satirized her plastic surgeries and gossiped about her whereabouts. In a recent interview with China Daily, Guo said the animosity she stirred was so intense that she had even considered suicide."I feel like I am an enemy of the state," she said. "The truth is that I am just a stupid girl who did something really stupid. No matter what I do, nobody wants to forgive me."Celebrities are more likely to become the targets of the word-of-mouth maelstrom online. Yang Lan, for instance, a famous TV anchorwoman, came under tremendous pressure as bloggers dug into her connections with China-Africa Hope Project, an organization set up by a prominent philanthropist, Lu Junqing, that became controversial because he empowered his 24-year-old daughter to manage the charity's substantial donated funds.Bloggers questioned whether the purpose of Lu's initiative was charity or cashing in on donators. Rumors held sway on micro blogs.A recent study from University of Michigan suggests that it is crucial that people distinguish between the truth and unfounded rumors in online social media, where vast amounts of information are easily spread across a large network by sources of unverified authority.According to Xie Gengyun, author of the 2010 China Micro Blog Annual Report and deputy dean at the Arts and Humanities Research Institute at Shanghai Jiaotong University, micro blogs can generate and spread unfounded rumors, such as the "Shanxi earthquake" and "Louis Cha's death"."Micro-bloggers are currently the better-educated people in China. But users will soon include those at the grassroots level, and the function of micro blogs will change from celebrity-watching to online socializing and venting about life's disappointments," Xie said.China's Internet, with more registered users than any other nation, is a lively forum for public opinion, said Xinhua News Agency. But "concocting rumors is itself a social malady, and the spread of rumors across the Internet presents a massive social threat."The micro blog platform tends to breed more rumors and assaults than other channels because of the limited amount of characters each post can use, according to Xiong Yihan, a sociologist with Fudan University."The word limit has made it hard to present a balanced and fair opinion. Besides, posts with extreme views are more likely to be forwarded online, because they satisfy people's thirst for the unknown," Xiong said.Xiong said Internet companies should suspend the accounts of users who spread rumors or libelous statements.

  

WASHINGTON, Dec. 7 (Xinhua) -- Drugs that affect the levels of an important brain protein involved in learning and memory reverse cellular changes in the brain seen during aging, according to an animal study published Wednesday in the Journal of Neuroscience. The findings could one day aid in the development of new drugs that enhance cognitive function in older adults.Aging-related memory loss is associated with the gradual deterioration of the structure and function of synapses (the connections between brain cells) in brain regions critical to learning and memory, such as the hippocampus.Recent studies suggested that histone acetylation, a chemical process that controls whether genes are turned on, affects this process. Specifically, it affects brain cells' ability to alter the strength and structure of their connections for information storage, a process known as synaptic plasticity, which is a cellular signature of memory.In the current study, Cui-Wei Xie, of the University of California, Los Angeles, and colleagues found that compared with younger rats, hippocampi from older rats have less brain-derived neurotrophic factor (BDNF) -- a protein that promotes synaptic plasticity -- and less histone acetylation of the Bdnf gene. By treating the hippocampal tissue from older animals with a drug that increased histone acetylation, they were able to restore BDNF production and synaptic plasticity to levels found in younger animals."These findings shed light on why synapses become less efficient and more vulnerable to impairment during aging," said Xie, who led the study. "Such knowledge could help develop new drugs for cognitive aging and aging-related neurodegenerative diseases, such as Alzheimer's disease," she added.

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