宜宾家医院体检做得好嘉兴体检中心,大理肺咳嗽疼是什么原因,呼伦贝尔科体检什么时候好,三门峡体检医院哪家比较专业,惠州查心脏的好方法,宿迁体检中心,南阳个中老年人做个全面体检要多少费用

BEIJING, July 26 (Xinhuanet) -- Hong Kong scientists announced that they had determined the idea of time travel is impossible by proving nothing can travel faster than the speed of light.The finding is contained in a study done by a research team from Hong Kong University of Science and Technology. The study was published Monday in a scientific journal "Physical Review Letters" in the United States."The study, which showed that single photons also obey the speed limit c, confirms Einstein's causality, that is, an effect cannot occur before its cause," the university said on its website."By showing that single photons cannot travel faster than the speed of light, our results bring a closure to the debate on the true speed of information carried by a single photon." said Professor Du Shengwang, who led the study.The possibility of time travel was raised 10 years ago when scientists discovered the optical pulses in some specific medium might propagate information in a faster-than-light speed."Our findings will also likely have potential applications by giving scientists a better picture on the transmission of quantum information." Du said.

JIANGYIN, Jiangsu, July 1 (Xinhua) -- China's manned deep-diving submersible, the Jiaolong, embarked on a journey on Friday during which it will make a 5,000-meter dive in the Pacific Ocean.During the dive, the submersible will undergo several operational tests in which it will take photos, shoot video, survey seabeds and take samples from the ocean floor, according to Jin Jiancai, deputy director of the submersible's diving test program team.The tests will be conducted in the Pacific Ocean in accordance with a contract signed between the China Ocean Mineral Resources Research & Development Association and the International Seabed Authority (ISA).The submersible is scheduled to spend 47 days at sea, according to a statement from the Ministry of Science and Technology.A submersible differs from a submarine, as it typically depends on another vessel or facility for support.The Jiaolong, designed to reach a depth of 7,000 meters, completed 17 dives in the South China Sea between May 31 and July 18 last year, reaching 3,759 meters during its deepest dive.In the year since the submersible's last dive, program team members have made several technical improvements to the submersible and its support vessel, Jin said.Jin said the program team members are "very confident" about the test.He also stressed that the test will be carried out in accordance with the provisions of the United Nations Convention on the Law of the Sea as well as the ISA's rules and regulations.The Jiaolong is the world's first manned submersible designed to reach depths of 7,000 meters below sea level, according to Xu Qinan, the submersible's chief designer.

TEHRAN, June 15 (Xinhua) -- Iran puts the Rasad (surveillance) satellite in the orbit on Wednesday, the state IRIB TV website reported.The Rasad satellite will render images to the country, said the report.All the procedure of designing, construction, testing and preparations to launch the satellite have been conducted domestically by Iranian experts, according to IRIB.The Rasad, weighs 15.3 kilograms and has been designed to be launched at 260 kilometers above the earth, said IRIB, adding that it will circle the earth 15 times in 24 hours.

BUDAPEST, June 25 (Xinhua) -- Visiting Chinese Premier Wen Jiabao made a five-point proposal here Saturday to enhance China's cooperation with countries in Central and Eastern Europe.When delivering a speech at the China-Central and East European Countries Economic and Trade Forum, Wen said China cherished its longstanding and deep friendship with the countries in the region."Over the past several decades, although the international situation and the domestic situations of both sides have undergone big changes, we have always enjoyed mutual respect, mutual trust, mutual understanding and mutual support," Wen said. Chinese Premier Wen Jiabao addresses the China-Central and Eastern European Countries Economic and Trade Forum in Budapest, Hungary, June 25, 2011.He said cooperation in various fields between the two sides had made tremendous progress, referring to the rapid growth of two-way trade, the burgeoning of mutual investment, the expansion of cooperation areas and the improvement of cooperation mechanisms.China encouraged its companies to "go global" and saw Central and Eastern Europe as a strategic priority, the Chinese leader said, adding that his current visit was "both a journey of friendship and a journey of cooperation."

LOS ANGELES, June 4 (Xinhua) -- Pregnant women who eat high-fat diet may be more likely to have a higher rate of stillbirth, a new study suggests.Researchers at Oregon Health & Science University (OHSH) came to the conclusion after observing 24 pregnant Japanese macaques that ate either a diet comprising 32 percent calories from fat or a control diet with 14 percent fat calories for at least four years.The researchers found the monkeys that ate a high-fat diet experienced a significant decrease in blood flow from the uterus to the placenta, a reduction of 38 percent to 56 percent, and a rise in placental inflammation.This was the case regardless of whether the monkeys were obese or slender. The risk of stillbirth was further compounded, however, when the monkeys were obese with hyper-insulinemia, or pre-diabetes.A large order of McDonald's french fries are shown May 22, 2008. McDonald's has switched to cooking oils free of trans fats in all of its restaurants in the United States and Canada, Chief Executive Jim Skinner said on may 23Eating a high-fat diet decreases blood flow from the mother to the placenta, the temporary organ that nourishes the unborn fetus, thus raising the risk of stillbirth, the researchers explained.Because the placental structure of the Japanese macaque is very similar to that in humans, cause and effect can be better established, the researchers said.Additional studies are needed to determine exactly how a high- fat diet decreases placental blood flow, the researchers noted.This is the first study to explain exactly how a fatty diet contributes to stillbirth, the researchers said in the study appearing in the June edition of the journal Endocrinology.The researchers hope their work will inform expectant moms and their physicians about the inherent dangers of a high-calorie, high- fat diet."This study demonstrates that maternal diet during pregnancy has a profound influence on both placental and fetal development," said Antonio Frias, M.D., principal investigator and assistant professor of obstetrics and gynecology (perinatology/maternal-fetal medicine) in the OHSU School of Medicine."The high-calorie, high-fat diet common in our society has negative effects on placental function and may be a significant contributor to adverse pregnancy outcomes, such as stillbirth."Previous studies have shown that nearly all adverse outcomes during pregnancy -- abnormal fetal growth, preeclampsia, preterm labor and stillbirth -- are in some way associated with an abnormally developed, or damaged, placenta, the temporary organ that nourishes the unborn fetus.In addition, maternal obesity has been associated with placental inflammation and dysfunction and an increased risk of stillbirth.Taking these findings into account, the researchers hypothesized that eating a diet high in fat during pregnancy also may increase the risk of placental inflammation and the risk of stillbirth.The researchers said they plan to conduct further studies on the impact of dietary changes and diet supplementation on improving outcomes in both monkeys and humans.