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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, April 1 (Xinhua) -- A NASA Gulfstream-III aircraft equipped with a synthetic aperture radar is scheduled to depart Sunday, April 3 on a nine-day mission to image Hawaii volcanoes, the Jet Propulsion Laboratory (JPL) announced on Friday.The aircraft will fly from the Dryden Aircraft Operations Facility in Palmdale, California to the Big Island of Hawaii to study the Kilauea volcano that recently erupted, said JPL in Pasadena, Los Angeles.The mission will help scientists better understand processes occurring under Earth's surface, JPL said.Developed by JPL, the Uninhabited Aerial Vehicle Synthetic Aperture Radar, or UAVSAR, uses a technique called interferometric synthetic aperture radar that sends pulses of microwave energy from the aircraft to the ground to detect and measure very subtle deformations in Earth's surface, such as those caused by earthquakes, volcanoes, landslides and glacier movements.As the Gulfstream-III flies at an altitude of about 12,500 meters, the radar, located in a pod under the aircraft's belly, will collect data over Kilauea, according to JPL.The UAVSAR's first data acquisitions over this volcanic region took place in January 2010, when the radar flew over the volcano daily for a week. The UAVSAR detected deflation of Kilauea's caldera over one day, part of a series of deflation-inflation events observed at Kilauea as magma is pumped into the volcano's east rift zone.This month's flights will repeat the 2010 flight paths to an accuracy of within 5 meters, or about 16.5 feet, assisted by a Platform Precision Autopilot designed by engineers at NASA's Dryden Flight Research Center on Edwards Air Force Base, California, JPL said.By comparing these camera-like images, interferograms are formed that reveal changes in Earth's surface, said JPL.Between March 5 and 11, 2011, a spectacular fissure eruption occurred along the east rift zone. Satellite radar imagery captured the progression of this volcanic event."The April 2011 UAVSAR flights will capture the March 2011 fissure eruption surface displacements at high resolution and from multiple viewing directions, giving us an improved resolution of the magma injected into the east rift zone that caused the eruption," said JPL research scientist Paul Lundgren."Our goal is to be able to deploy the UAVSAR on short notice to better understand and aid in responding to hazards from Kilauea and other volcanoes in the Pacific region covered by this study," Lundgren added.

BEIJING, Feb. 19 (Xinhua) -- Chinese Vice Premier Li Keqiang has demanded the comprehensive enforcement of the country's food safety laws, urging checks to be tightened against unsafe food products.China should enhance efforts to ensure food safety, which is crucial for protecting human lives and improving people's living standards, Li said while addressing a meeting on food safety on Friday, according to an official statement issued Saturday.Also, emphasis should be directed to both special campaigns, which are launched to check against unsafe food, as well as daily supervision of food manufacturers, he said.The meeting also heard reports on food safety delivered by officials from health and agriculture ministries, the State Administration for Industry and Commerce, and the General Administration of Quality Supervision, Inspection and Quarantine.Participants at the meeting agreed that China should improve its system to monitor and assess food safety risks and enhance emergency response capabilities in this regard.They also called for improvement of food safety-related laws and regulations, as well as measures to target those core factors that affect the safety of food products.At the meeting, local government departments were asked to closely cooperate and improve the system to ensure food safety.Further, the participants agreed that authorities should publicize accurate information about food safety in a timely manner, and do more to forge a social atmosphere favorable for ensuring food safety.

CHICAGO, Jan. 20 (Xinhua) -- Chinese President Hu Jintao arrived here on Thursday afternoon from Washington, after meetings with U.S. President Barack Obama on major bilateral and world issues.During their talks Wednesday, the two leaders agreed to build a China-U.S. cooperative partnership based on mutual respect and mutual benefit.In Chicago, Hu will meet local officials and visit a high school, Chinese officials said.Chinese President Hu Jintao (R front) meets with Mayor of Chicago Richard Daley(L front) in Chicago, the United States, Jan. 20, 2011. Hu arrived in Washington Tuesday for a four-day visit to the United States. The trip, his second as head of state, is aimed at enhancing the positive, cooperative and comprehensive relationship between China and the United States.The Chinese president visited the United States in April 2006.

BEIJING, Jan. 22 (Xinhua) -- Chinese President Hu Jintao has just ended his four-day landmark visit to the United States.During the visit, both sides agreed to build a China-U.S. cooperative partnership based on mutual respect and mutual benefit, which is to lead the development of bilateral ties in the future.It is widely believed that, in the new era, China and the United States need to enhance their political and economic relations, as well as boost cooperation in regional and international affairs.In order to achieve that, observers from across the world hold that the key lies in common actions.BLUEPRINT FOR BILATERAL RELATIONSReiterating their commitment to developing a positive, cooperative and comprehensive China-U.S. relationship as they agreed in 2009, Chinese and U.S. leaders also vowed to build "a cooperative partnership based on mutual respect and mutual benefit", during Hu's visit to Washington.The two terms showed a kind of progress which represented the increasing common interests and mutual need of the two sides over the recent period, as well as more and more challenges that required the joint efforts of the largest developed and developing countries, Chinese Vice Foreign Minister Cui Tiankai said.Yuan Peng, director of the America Studies of China Institute for Contemporary International Relations (CICIR), said the new expression of bilateral ties was positive, objective and pragmatic.As the deepening and development of the previous expression, the new term was a highlight of President Hu's U.S. visit, Yuan said.The joint statement issued by both sides during Hu's stay, which is built upon bilateral efforts to establish the cooperative partnership based on mutual respect and mutual benefit, is a clear reflection of the two countries' resolution and pragmatic attitude in jointly meeting global challenges, according to Chen Kang, professor at Lee Kuan Yew School of Public Policy at the National University of Singapore.In a nutshell, every word matters in the new expression.As "mutual respect" urges both China and the United States to respect each other's core interests and path of development, "mutual benefit" means that both countries are expected to achieve a win-win situation rather than a win-lose one, and bring about common prosperity."Partnership," meanwhile, shows that the two powers, instead of being rivals, are closely linked with each other in actions to cope with regional and international issues.Fu Mengzi, a researcher with the Beijing-based CICIR, told Xinhua, while every country attached great importance to their own national interest, their respective interests were neither unilateral nor absolute."When seeking its own interest, a country should meanwhile take into consideration the interest and major concerns of other countries," Fu said, adding that only by so doing could a win-win result rather than a zero-sum relationship be achieved.