中山便血的原因是什么呢(中山排便有血是什么原因) (今日更新中)

SAN FRANCISCO, May 26 (Xinhua) -- Internet advertising revenues in the United States surged to 7.3 billion U.S. dollars in the first quarter of 2011, the highest first-quarter revenue level on record for the industry, said a new report released on Thursday.The numbers also represented a 23-percent increase over the same period a year earlier, the Interactive Advertising Bureau ( IAB) and PricewaterhouseCoopers said in the report."The consistent and considerable year-over-year growth we're seeing demonstrates that digital media is an increasingly popular destination for ad dollars, and for good reason," Randall Rothenberg, chief executive officer of the IAB, said in a statement."As Americans spend more time online for information and entertainment purposes, digital advertising and marketing has emerged as one of the most effective tools businesses have to attract and retain customers," he added."These numbers indicate that the interactive advertising field hasn't simply bounced back since the recession; it's growing with dynamic energy," noted David Silverman, a partner at PricewaterhouseCoopers.IAB, a trade association for interactive marketing, comprised more than 500 media and technology companies who are responsible for selling 86 percent of online advertising in the United States.

You can think of NASA's Discovery program as a sort of outer-space American Idol: every few years the agency invites scientists to propose unmanned planetary missions. The projects have to address some sort of fundamental science question, and (this is the tough part) they have to be relatively cheap to pull off — say, half a billion dollars or so. Then the proposals go through a grueling competition before judges who aren't as nasty as Simon Cowell but who are every bit as tough. The one left standing at the end gets the equivalent of a recording contract: NASA supplies the funding and the launch vehicle, and away the winner goes — to orbit Mercury, as the Messenger spacecraft is doing right now; or to rendezvous with a couple of asteroids, as the Dawn mission will start doing this July; or to smash into a comet on purpose, a feat achieved by Deep Impact in 2005, a mission not to be confused with the movie of the same name. Now it's time for the next contenders. NASA has just announced that the first round of the latest Discovery competition is over, with three entries out of 28 moving on to the finals. They are, in increasing distance from Earth: the Geophysical Monitoring Station (GEMS) lander, which would use seismometers to study the interior of Mars; the Comet Hopper, which would do just that, leaping from place to place across the surface of Comet 46P/Wirtanen to see how different parts of the tumbling body react to heating by the sun; and the Titan Mare Explorer (TiME), which would plop into a sea of liquid hydrocarbons on Saturn's moon Titan — the first oceangoing vessel ever to set sail on another world. If you had to come up with a theme that ties all three missions together, it would be "origins." The Titan explorer, for example, will be studying a place that — in a crude way, at least — resembles the early planet Earth at a time when life arose here. Titan, with a thick atmosphere and a bizarro-world form of weather featuring toxic winds and hydrocarbon rain, is home to a mix of complex chemistry, complete with organic molecules. The oceans provide a medium in which the molecules can move around and interact with each other. It's even conceivable, though clearly a long shot, that some form of microscopic life already exists on this frigid moon. The Mars lander, by contrast, would visit a place where the seas — plain water in this case — vanished long ago. But the mission of GEMS goes far deeper than that. By analyzing Marsquakes on the Red Planet, GEMS will try to get a handle on what the interior of Mars is like. Scientists don't currently know whether the planet's core is liquid, like Earth's, or solid, or some mushy consistency in between. It all depends on how efficiently Mars has cooled since it formed 4.5 billion years ago, and that depends in turn on the planet's internal structure. "That's the mission," says Bruce Banerdt, of NASA's Jet Propulsion Laboratory, the lead scientist for GEMS. "We want to understand how Mars was built." Along with sensitive seismographic equipment, GEMS will drill down about 20 ft. (6 m) with a thermometer-equipped probe, trying to figure out how quickly the temperature rises with depth. "That will let us extrapolate all the way down to the center," Banerdt says, "which will tell us how fast Mars is cooling."

SAN FRANCISCO, March 22 (Xinhua) -- Apple Inc. on Tuesday announced that iPad 2, the second-generation of its popular tablet computer, will be available in China's Hong Kong, Korea, Singapore and additional countries and regions in April.The company also confirmed that iPad 2 will go on sale in 25 countries on March 25 in addition to the United States, where the device first hit market on March 11 and has seen strong demand."While competitors are still struggling to catch up with our first iPad, we've changed the game again with iPad 2," Steve Jobs, Apple's chief executive officer, said in a statement."We're experiencing amazing demand for iPad 2 in the U.S., and customers around the world have told us they can't wait to get their hands on it. We appreciate everyone's patience and we are working hard to build enough iPads for everyone," he noted.Apple had planned to released iPad 2 in Japan on March 25, but delayed the launch in the aftermath of the catastrophic March 11 earthquake and ensuing tsunami in the country.The 25 countries where iPad 2 will go on sale on March 25 include Australia, Austria, Belgium, Canada, the Czech Republic, Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Mexico, the Netherlands, New Zealand, Norway, Poland, Portugal, Spain, Sweden, Switzerland and Britain.

LOS ANGELES, April 2 (Xinhua) -- The United States could soon be faced with an epidemic of Non-Alcoholic Fatty Liver Disease ( NAFLD), one of the major contributing factors of chronic liver disease (CLD), the American Association for the Advancement of Science (AAAS) reported Saturday.If the current rates of obesity and diabetes continue for another two decades, the prevalence of NAFLD in the U.S. is expected to increase by 50 percent in 2030, AAAS said.The prediction is based on pre-existing clinical survey data over a 10 year period (1988-1994, 1999-2004 and 2005-2008), which included 39,500 adults from three survey cycles, according to the AAAS.Over the three cycles, the prevalence of NAFLD doubled from 5. 51 percent to 11 percent respectively. Furthermore, during the first survey cycle (1988-1994) 46.8 percent of all CLD's was related to NAFLD but by 2005-2008 this had increased to 75.1 percent. In addition, the prevalence of obesity and diabetes, the two key risk factors for NAFLD also steadily increased."If the obesity epidemic is anything to go by, the U.S. NAFLD epidemic may have a ripple effect worldwide," said Mark Thursz, Vice Secretary of the European Association for the Study of the Liver. "It is imperative that health systems continue to drive effective educational programs to reinforce awareness among the general public to alert them of the risks of obesity and promote the importance of diet and exercise."Non-alcoholic fatty liver disease is fast becoming one of the top concerns for clinicians due to the obesity epidemic and it's potential to progress to advanced liver disease which significantly impacts on overall liver-related mortality, Thursz said in remarks published by AAAS' website EurekAlert.org.NAFLD, considered as one of the major causes of morbidity and mortality worldwide, is the term used to describe fat build-up in liver cells in people who do not drink alcohol excessively. The disease is the most common persistent liver disorder in Western countries with an estimated overall prevalence of 20-30 percent, according to AAAS.NAFLD encompasses a spectrum of liver disease associated with insulin resistance, diabetes and obesity and as such people most at risk of NAFLD are those who are obese, have insulin resistance associated with diabetes, high blood pressure and cholesterol.

BEIJING, Jan. 24 (Xinhua) -- Chinese Premier Wen Jiabao called on the public to give suggestions on the government work during his visit to central China's Henan Province on Friday and Saturday.Wen visited urban communities and villages in Henan to hear citizens' voices, to prepare for the Report on the Work of the Government, which he will deliver at the National People's Congress in March.He made his first stop at a renovated shanty-town in the city of Hebi, an industrial city reliant on coal mining.Wen visited the family of Song Helian, a factory worker who has just moved from a 50-square-meter room to a three-bedroom apartment.Chinese Premier Wen Jiabao (R, front), who is also a member of the Standing Committee of the Political Bureau of the Communist Party of China (CPC) Central Committee, attends a symposium in Hebi, central China's Henan Province, Jan. 21, 2011. Wen Jiabao visited urban communities and villages in Henan on Jan. 21 and 22 to hear citizens' voices, to prepare for the Report on the Work of the Government, which he will deliver at the National People's Congress in March. He told local cadres the renovation of shantytowns has a direct bearing on people's livelihoods and must be carried out successfully.During his meeting with residents of a community, Wen told them, "The job of the government is to serve the people and to secure a better life for the people. You are in the best position to criticize the government's work report and the next five-year plan."The residents and Wen talked about recent price rises, medical insurance and employment for laid-off workers among other things.During a visit to a village, Wen met with villagers and stressed the importance of agricultural technology.Wen also called for greater efforts to improve rural health facilities.

来源：资阳报