南京大功率工业吸尘器(邵阳工业吸尘器) (今日更新中)

LOS ANGELES, May 25 (Xinhua) -- NASA project managers bade farewell to the Mars rover Spirit on Wednesday after sending a final set of commands to the stranded vehicle.This marks the completion of one of the most successful missions of interplanetary exploration ever launched, NASA's Jet Propulsion Laboratory (JPL) said."Last night, just after midnight, the last recovery command was sent to Spirit," said John Callas, the Mars Exploration Rover Project manager at NASA's Jet Propulsion Laboratory (JPL) in Pasadena, Los Angeles."It would be an understatement to say this was a significant moment. Since the last communication from Spirit on March 22, 2010, as she entered her fourth Martian winter, nothing has been heard from her."NASA has tried in vain to regain communication with Spirit since it got stuck in sand about two years ago. The rover last communicated on March 22, 2010, as Martian winter approached and the rover's solar-energy supply declined.NASA checked frequently in recent months for possible reawakening of Spirit as solar energy available to the rover increased during Martian spring, but to no avail.A series of additional re-contact attempts ended on Wednesday, designed for various possible combinations of recoverable conditions, according to JPL."Our job was to wear these rovers out exploring, to leave no unutilized capability on the surface of Mars, and for Spirit, we have done that," said Callas.

LOS ANGELES, May 23 (Xinhua) -- NASA's Gravity Recovery And Interior Laboratory spacecraft (Grail) will begin final preparations for a launch on a Moon mission in late summer, the Jet Propulsion Laboratory (JPL) said on Monday.The dynamic duo will orbit the moon to determine the structure of the lunar interior from crust to core and to advance understanding of the thermal evolution of the moon, according to JPL in Pasadena, Los Angeles.After arriving at the Astrotech payload processing facility in Titusville, Florida last week, the Grail twins, known as Grail-A and Grail-B, were removed from their shipping containers Monday. Later this week, they will begin functional testing to verify their state of health, said JPL.The twins were shipped from Lockheed Martin Space Systems, Denver.Over the next four months at the Astrotech facility, the spacecraft will undergo final testing, fueling and packaging in the shroud that will protect them as the Delta II launch vehicle lifts them into space. The spacecraft will then be transported to the Cape Canaveral Air Force Station for installation atop the rocket that will carry them toward the moon, JPL said."We're only a few full moons away from a mission that will reveal clues not only into the history of the moon and Earth, but will provide important data for future lunar exploration," said Maria Zuber, Grail's principal investigator, based at the Massachusetts Institute of Technology.Grail will be carried into space aboard a United Launch Alliance Delta II Heavy rocket lifting off from Launch Complex-19 at the Cape Canaveral Air Force Station in Florida. The launch period opens Sept. 8, 2011, and extends through Oct. 19. For a Sept. 8 liftoff, the launch window opens at 5:37 a.m. PDT (8:37 a.m. EDT) and remains open through 6:16 a.m. PDT (9:16 a.m. EDT).Grail-A and Grail-B will fly in tandem orbits around the moon for several months to measure its gravity field in unprecedented detail.The mission will also answer longstanding questions about Earth' s moon, and provide scientists a better understanding of how Earth and other rocky planets in the solar system formed, according to JPL, which manages the Grail mission.

LOS ANGELES, April 29 (Xinhua) -- Clinical and teaching microbiology laboratories are linked with a nationwide salmonella outbreak in the United States that has killed one person and sickened dozens of others, health officials confirmed on Friday.Since August, about 73 people in 35 states have been sickened by salmonella bacteria, and some of those cases involve a strain of Salmonella typhimurium sold commercially to laboratories, officials from the Centers for Disease Control and Prevention (CDC) said in remarks published by msnbc.com.Illnesses have been tied to laboratories from Alaska to New York, with most reporting one or two cases. Five cases have been reported in Washington state and four in Minnesota.The first illness occurred late August and the most recent cases were reported March 8, according to the CDC.The patients include employees and students of the laboratories, as well as children in the homes of people who work or study at the labs.Patients ranged in age from less than one to 91, with a median age of 24, the CDC said.Cases that developed after March 19 may not yet be included in the total because of the lag time in assessing and reporting illness, said the report.CDC officials warned that bacteria used in the labs can be transmitted through contaminated lab coats, pens, notebooks, car keys and other items brought into the labs.The CDC is working with local and state health departments, the American Society for Microbiology and the Association of Public Health Laboratories to track the outbreak, the report said.Salmonella infections typically result in diarrhea, fever and abdominal cramps. They can be dangerous in very young children or people with compromised immune systems.

WASHINGTON, May 25 (Xinhua) -- The number of young adults in the United States with high blood pressure may be much higher than previously reported, according to a new study by researchers at the University of North Carolina (UNC) at Chapel Hill.Researchers analyzed data on more than 14,000 men and women between 24 and 32 years old in 2008 from the National Longitudinal Study of Adolescent Health, known as Add Health. They found 19 percent had elevated blood pressure, also referred to as hypertension. Only about half of the participants with elevated blood pressure had ever been told by a health-care provider that they had the condition."The findings are significant because they indicate that many young adults are at risk of developing heart disease, but are unaware that they have hypertension," said Quynh Nguyen, a doctoral student at UNC's Gillings School of Global Public Health and the study's lead author. Hypertension is a strong risk factor for stroke and coronary heart disease, the leading cause of death for adults in the United States.The findings were published this week in the journal Epidemiology.Kathleen Mullan Harris, Add Health's principal investigator and a co-author of the paper, said the findings were noteworthy because they were from the first nationally representative, field- based study of blood pressure to focus on young adults."The message is clear," said Harris. "Young adults and the medical professionals they visit shouldn't assume they're not old enough to have high blood pressure. This is a condition that leads to chronic illness, premature death and costly medical treatment."

BEIJING, Feb. 10 (Xinhua) -- More than 9,300 kidnapped children in China have been rescued since April 2009 since a nationwide campaign was launched to crack down on human trafficking, according to the Ministry of Public Security Thursday.In a statement, the ministry encouraged the involvement of civilians in providing clues to help the police rescue minors -- especially those being abused and forced to beg on the streets.In less than three weeks, a Chinese microblog called "Street Photos to Rescue Child Beggars" attracted 175,000 followers and posted more than 2,500 images of begging children online for parents to identify.The blog was set up last month by a professor with the Rural Development Institute of the Beijing-based China Academy of Social Sciences. It has helped rescue six children so far.However, the ministry noted in the statement that children kidnapped to become beggars took up only a small portion of all cases of child beggars. In most cases, children were taken to beg along with their parents or relatives.The ministry has urged police authorities across the country to closely cooperate with civil affairs, urban management and health departments in apprehending people who force children to become beggars.

来源：资阳报