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時間:2022-08-15 來源:本站 點擊:258次

Yanqing's competition venues for Beijing 2022 fully covered with 5G******

BEIJING, Dec. 17 (Xinhua) -- With less than 50 days away before the Beijing 2022 Olympic Winter Games, full coverage of 5G signals has been in place at the National Sliding Center and the National Alpine Skiing Center.。

The two venues, located in the Yanqing competition zone, are set to host the alpine skiing, bobsleigh, skeleton and luge competitions during the Games.。

According to China Unicom, a leading telecom firm in China and the official telecommunication services partner for the Games, more than 30 5G base stations have been set up at the venues to ensure real-time weather forecast, timing and scoring, as well as media coverage.。

Yang Peng, deputy general manager of the network department of China Unicom Beijing, said that weather conditions play a pivotal role in alpine skiing, making 5G-backed real-time weather data collection for a forecast one of the top priorities for the event.。

"The 5G coverage enables real-time transmission of initial velocity, instantaneous speed and other data of athletes for timing and scoring," said Zhang Jia, director of Winter Olympics Office of China Unicom Beijing.。

Remote medical care can also be empowered by 5G during the Games in case of any injury, Zhang added.。

The 2022 Winter Olympics will open on February 4. Enditem。

Chinese yuan weakens to 6.4145 against USD Thursday******

BEIJING, Nov. 11 (Xinhua) -- The central parity rate of the Chinese currency renminbi, or the yuan, weakened 197 pips to 6.4145 against the U.S. dollar Thursday, according to the China Foreign Exchange Trade System.。

In China's spot foreign exchange market, the yuan is allowed to rise or fall by 2 percent from the central parity rate each trading day.。

The central parity rate of the yuan against the U.S. dollar is based on a weighted average of prices offered by market makers before the opening of the interbank market each business day. Enditem。

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坚决杜绝德尔塔及奥密克戎肺炎疫情键入 重点地区来返西安工作人员将被赋码管理方法******

本报讯 (小编 李亮黎)1月2日至今,河南、上海、广东省深圳市陆续产生德尔塔株引发的当地疫情;1月8日天津又发生了奥密克戎突变株引发的当地疫情,目前为止,总计验出40例病毒感染者。以上地域疫情所汇报的病案活动轨迹涉及到医院门诊、药房、院校、餐饮店、市集及其城市公共交通等好几个群体聚集场地,小区散播和疫情外流风险性很高,为严格预防河南、上海、广东省深圳市、天津疫情与本市疫情累加,西安市疾控中心提示广大群众积极上报行程安排。尤其是14日内与中国汇报的诊断病案以及密切接触者有触碰史或是活动轨迹有相交的来(返)西安人员;有中国中风险地域所属县(区)旅居生活史来(返)西安人员;尤其是河南省郑州市,许昌市禹州市、周口市太康县、信阳市固始县、商丘市睢阳区、安阳市文峰区、滑县,上海浦东新区、上海奉贤、上海市宝山区,浙江绍兴、金华市及其天津产业生态圈、广东深圳市龙岗区的来(返)西安人员,第一时间积极向所属小区(村)、企业或所住宾馆上报,并相互配合做好信息备案、抗体检测及集中化防护14天等防控措施。








在发射升空三十天后,詹姆斯·韦伯望远镜(James Webb Telescope)于北美时间1月24日抵达距离地球150万公里的目的地——第二拉格朗日点。该点始终与地球和太阳保持在几乎同一直线上,使得仪器运转保持相对稳定。现在,地球上的控制人员将会在接下来的几个月对望远镜进行调节,为科学研究做准备。

James Webb telescope parked in observing position

Thirty days after it was launched, the James Webb telescope has arrived at the position in space where it will observe the Universe.

在发射升空三十天后,詹姆斯·韦伯望远镜(James Webb Telescope)已经在太空中抵达其将要观测宇宙的位置。

The Lagrange Point 2, as it's known, is a million miles (1.5 million km) from Earth on its nightside.

这个被称为拉格朗日L2点(Lagrange Point 2)的位置,在地球阴面之外100万英里(150万公里)处。

Webb was finally nudged into an orbit around this location thanks to a short, five-minute thruster burn.


Controllers back on Earth will now spend the coming months tuning the telescope to get it ready for science.


Key tasks include switching on the observatory's four instruments, and also focusing its mirrors - in particular, its 6.5m-wide segmented primary reflector.


"There's a pretty intensive effort to take all of those 18 segments from their current state and get them to act as one big mirror, and also to get the secondary mirror into its optimised condition," explained Charlie Atkinson, the chief engineer on Webb at Northrop Grumman, the American aerospace company that co-led the telescope's development with the US space agency (Nasa).

“将全部18个部分从现在的状态调节成一面大主镜,还要将副镜调到最佳状态,当中有颇为繁重的工作要做,”诺斯洛普·格鲁曼公司(Northrop Grumman)的韦伯望远镜首席工程师查理·阿特金森(Charlie Atkinson)解释说。这家美国航天企业与美国太空总署(NASA)联合主导这个望远镜的研发。

Webb, billed as the successor to the famous Hubble Space Telescope, was launched on 25 December by an Ariane-5 rocket from French Guiana.

韦伯被标榜为著名的哈勃太空望远镜(Hubble Space Telescope)继任者。它在12月25日在法属圭亚那用一枚亚利安5号运载火箭发射升空。

Its overarching goals are to take pictures of the very first stars to shine in the Universe and to probe far-off planets to see if they might be habitable.


Europe's Ariane-5 gave the new observatory a near-perfect trajectory and velocity to get it out to L2. Even so, two course correction burns were necessary, with the third on Monday tipping Webb into its planned parking position.


The Lagrange Point 2 is one of five gravitational "sweet-spots" around the Sun and Earth where satellites can hold their position with few orbital adjustments, thus conserving fuel.


The other advantage is that Webb will not experience at L2 the big swings in temperature and light endured by space telescopes positioned much closer to Earth.


This is vital for the mission. It's designed to view the cosmos in infrared light and must maintain therefore constant super-cold conditions for its hardware.


Infrared light has waves that are just longer than those of visible light. "Seeing" in the infrared will allow the telescope to, for example, look through dust to image stars that would otherwise be obscured.


Webb will now circle L2, keeping the Earth and the Sun in a near-straight line.


"L2 is pseudo-stable," said Jean-Paul Pinaud, who leads the Northrop engineers that keep Webb on track.

“L2点是假稳定状态,”负责领导诺斯洛普·格鲁曼公司的工程师确保韦伯保持轨道的让-保罗·皮诺(Jean-Paul Pinaud)说。

"The flight operations team is preparing routine station-keeping burns. They'll be doing those every 20 days or so with the trajectory calculations provided by our flight dynamics team. We'll set them up in a similar way, and then fire the thruster. But the burns will be quite small."


Hidden behind a big sunshield, Webb's optics and instruments will soon cool to about -230C (some sections of the telescope are already there). When that happens, controllers will switch on Webb's Near Infrared Camera (NIRCam) to take a picture of a test star to begin the process of aligning the big mirror.


"We know when we first focus on a star in space, we'll actually see 18 different spots of light because the 18 individual mirror segments won't be aligned," said Nasa instrument systems engineer Begoña Vila.

“在我们第一次聚焦于太空中的一颗星的时候,我们会看到18个不同的光点,因为18块单独的镜元件并没有在同一个平面上,”太空总署的设备系统工程师贝戈尼娅·维拉(Begoña Vila)说。

"But we'll adjust the mirrors to bring all the spots together to make a single star that's not aberrated and good for normal operations. It's a long process. It can take up to three months during commissioning, and we are ready to do that.”


Focusing involves driving small actuators, or motors, on the back of the 18 segments of the primary mirror to harmonise their curvature. The current misalignment, which is measured in millimetres, will be brought down to one measured in nanometres - a factor of a million improvement.


Similar adjustments will be applied to the 74cm-diameter secondary reflector which sits out in front of the primary mirror and is used to bounce light back towards the instruments.


So far, the Webb mission has not put a step wrong. The launch and journey out to L2 passed off without incident.


And even the complex business of unfolding the telescope after it came off the top of the Ariane rocket was made to look like the easiest of rehearsals.


"We were thrilled with the precision and success of all those deployments," said Kyle Hott, the mission systems engineering lead at Northrop.

“我们对所有这些程序的精确和成功感到激动,”此次任务的诺斯洛普·格鲁曼公司系统工程师主管凯尔·霍特(Kyle Hott)说。

"It's pretty incredible to think that it was all just a concept on paper decades ago, and now it's actually here, arriving at L2. Morale is high and we're so very excited."





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