2018-01-21 18:30:00

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Tour buses drive along the winding roads at Guoliang village, Central China's Henan province, in this file photo. [Photo/VCG]


To symbolize the city's attachment to the fine material, a gift package for the B20 Summit guests contains a pure silk scarf. More than 800 participants at the B20 Summit received such scarves.Three other foundations were punished for violations including failing to submit annual work reports to regulators or failing to publicly disclose information, the MCA said, without detailing the penalties.

BEIJING - The cylinder-shaped black object bears no resemblance to any ordinary clock, but it is one of the most advanced timepieces ever.

It was sent to space with the Space Laboratory of China's Tiangong-2 on Thursday, becoming the first ever cold atom clock working in space.

"This clock is so accurate that it should not lose one second in 30 to 300 million years in space," says Liu Liang, professor and director of the Key Laboratory of Quantum Optics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences.

Unlike ordinary clocks, the timekeeping device is based on atomic physics.

And unlike the most atomic clocks, this clock uses more advanced "cold atom" technology, ensuring its ultra precision.

A mechanical watch loses almost one second a day; a quartz watch loses about one second every 10 days; the hydrogen atomic clock loses about one second over millions of years; the cold atom clock exceeds all in accuracy, Liu says.

Scientists attribute its accuracy to the microgravity environment in space as well as the coldness of the atoms the clock uses.

Under microgravity conditions, the cold atoms, pushed by lasers, perform a uniform motion in a straight line. By observing their performance, scientists get more precise atomic clock signal than under the gravity conditions on Earth.

Moreover, the laser cooling technology helps to eliminate the influence of atomic thermal motion on the clock's performance.

"Though molecules and atoms can't be seen in a room, they are actually moving at high-speed, and the speed is equivalent to temperature," Liu explains.

"We use laser cooling technology to slow down the atoms to a temperature that a refrigerator could never reach, so they nearly stay still," Liu says. "By observing the almost static atoms we make our measurements more precise."

Scientists believe that putting such a clock in space will help set a time standard to synchronize other atomic clocks in space more precisely.

"A more accurate clock system in space will benefit us on Earth," Liu says, citing possible substantial improvements in navigation and positioning accuracy.

Scientists say the development of cold atom technology could also make many experiments possible, such as deep space navigation and positioning, dark matter probes, and even gravitational wave exploration.

"A lot of research is based on our measurement of time and space. If we could detect subtle changes in time and space, we could make discoveries beyond the range of existing technology," Liu says.

"In the future, there will be more accurate clocks than this cold atom clock and our ultimate goal is to make a clock that will never be a second fast or slow over the life of the universe."


《环球时报》记者在孟买一家老牌电影院感受过观影前播放国歌的场面。五十年代后期,退踞台湾的国民党空军装备了美制高空高速侦察机,凭借先进的飞机性能和高空优势频繁进入中国大陆领空。她在中国国际商会主办的 APEC(亚太经合组织)未来之声 中国区选拔赛总决赛中夺得桂冠,作为中国青年代表赴秘鲁首都立马,参加2016年APEC正式会议。目前,事故涉嫌责任人已被控制,事故原因仍在调查中。










Move aside Shanghai Tower, there's a new big boy in the town. Shenzhen, China's southern city neighboring Hong Kong, has announced a plan to build a skyscraper as high as 739 meters on the old site of Huanyu Tower in the newly designed Caiwuwei central financial district.At one point, Leonard had to cross a river during the race. Instead of thinking about beating others, he stopped and carried Gobi across. After the race, Leonard decided to take her home to Scotland.


Kurt Straif, a program director at the IARC, said the risk is small, but significant. "For an individual, the risk of developing colorectal cancer because of their consumption of processed meat remains small, but this risk increases with the amount of meat eaten," he said.Xi made the remarks Tuesday at a group study attended by members of the Political Bureau of the CPC Central Committee.