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中国成功发射北斗三号系统首颗倾斜地球同步轨道卫星******

原标题:中国成功发射北斗三号系统首颗倾斜地球同步轨道卫星

中新网四川西昌4月20日电(郭超凯)北京时间4月20日22时41分,中国在西昌卫星发射中心用长征三号乙运载火箭,发射第44颗北斗导航卫星。

郭文彬 摄

北斗卫星导航系统工程总设计师杨长风介绍称,此次发射的卫星是北斗三号系统第20颗组网卫星,属于北斗三号系统首颗倾斜地球同步轨道卫星。这种包含倾斜地球同步轨道、地球同步轨道、中圆地球轨道三种不同类型轨道卫星的混合星座设计是北斗系统独有、国际首创,将有效增加亚太地区卫星可见数,为亚太地区提供更优质服务。

这次发射是2019年度北斗导航卫星首次发射,拉开了今年北斗高密度组网的序幕。今年计划发射8-10颗北斗三号组网卫星,完成所有中圆地球轨道卫星发射,进一步完善全球系统星座布局,全面提升系统服务性能和用户体验。

自去年底北斗三号工程建成基本系统、开通全球服务以来,北斗系统运行平稳,经全球范围测试评估,在全球区域定位精度优于10米,在亚太区域定位精度优于5米,满足指标要求。

郭文彬 摄

杨长风表示,经过多年发展,北斗已形成完整产业链,在中国交通、农业、公安、测绘等行业以及大众领域已实现规模化应用。今年,将逐步加大与互联网、大数据、人工智能等新兴技术的深度创新融合,不断催生“北斗+”融合应用新模式和新业态。据统计,截至2018年底,国产北斗导航型芯片模块等基础产品销量已突破7000万片,国产高精度板卡和天线销量分别占国内市场份额的30%和90%。

郭文彬 摄

目前,北斗系统在印度尼西亚土地确权、科威特建筑施工、乌干达国土测绘、缅甸精准农业、马尔代夫海上打桩、柬埔寨无人机、泰国仓储物流、巴基斯坦机场授时以及俄罗斯电力巡检等领域得到广泛应用。北斗高精度产品出口90多个国家和地区,北斗地基增强技术和产品成体系输出海外。

月亮与火箭的合影。郭文彬 摄

用于执行第100次发射任务的长征三号乙运载火箭由中国航天科技集团一院抓总研制,此次发射的北斗三号系统首颗倾斜地球同步轨道卫星由中国航天科技集团五院抓总研制。后续,该卫星将变轨进入工作轨道,并进行一系列在轨测试,将与此前发射的18颗中圆地球轨道卫星和1颗地球同步轨道卫星进行组网,提供服务。(完)

Biden intends to run again in 2024: White House******

AFP。

US President Joe Biden and First Lady Jill Biden board Air Force One at Joint Base Andrew's, Maryland, on November 22.。

US President JoeBiden intends to run for re-election in 2024, White Housespokeswoman Jen Psaki told reporters on Monday.。

Biden, 79, has suffered a dip in his job approval ratings inrecent months, leading some Democrats to wonder whether he mightnot seek another four-year term.。

"He is. That's his intention," Psaki said as Biden flewaboard Air Force One for a Thanksgiving event with US troopsin Fort Bragg, North Carolina.。

Democrats were rattled by Republican victories in Virginia'sstate elections earlier this month and a narrow Democraticvictory in New Jersey.。

Questions have arisen about the viability of Vice PresidentKamala Harris in 2024 should Biden decide not to run again. Arecent USA TODAY/Suffolk University poll found her with a 28 percentjob approval rating.。

Biden underwent his first physical examination on Fridaysince taking office in January and doctors found he has astiffened gait and attributed frequent bouts of coughing to acidreflux. Doctors said he was fit to serve.。

Biden's political prospects appeared to have been buoyedlast week by congressional passage of a US$1 trillioninfrastructure plan. Still being debated is another US$2 trillionin spending on a social safety net package.。

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Countdown to Beijing 2022******

BEIJING, Dec. 7 (Xinhua) -- Under the appeal of the Olympic Motto of "Faster, Higher, Stronger - Together," political neutrality of sport and support for the Beijing 2022 Olympic Winter Games is the broad consensus of the international community and the common aspiration of sporting world, a spokesperson of the organizing committee told Xinhua in an exclusive interview.。

The spokesperson said that political neutrality has accompanied the development of Olympic Movement throughout Olympic history. As it sets out in the Olympic Charter, "sports organisations within the Olympic Movement shall apply political neutrality," and the International Olympic Committee (IOC) opposes "any political or commercial abuse of sport and athletes."

Politicizing sport is against the spirit of the Olympic Charter. It does harm to the common interest of athletes and the big Olympic Family.。

The spokesperson continued to emphasize that the Olympic Winter Games is a sport extravaganza for countries and regions around the world, and a platform for athletes worldwide to compete in the spirit of fair play.。

"How many Olympic Games can an athlete participate in their career? For some, an absence of one could be a regret of a lifetime. Based on the accreditation application so far, competing in Beijing 2022 is the aspiration of winter sports athletes worldwide," the spokesperson said. "Moreover, against the backdrop of surging COVID-19 pandemic and economical downturn, a successful Beijing Winter Olympics will strengthen global solidarity to fight against the virus and demonstrate the Olympic spirit of 'Together.'

According to the spokesperson, supporting for the Beijing 2022 is the broad consensus of the international community as leaders of multiple countries have voiced firm support for the Olympic and Paralympic Winter Games in various forms.。

As the spokesperson pointed out, supporting Beijing 2022 has been written into important documents of the BRICS Summit, the Shanghai Cooperation Organization Summit and other multilateral mechanisms. The Meeting of China-Russia-India Foreign Ministers and the Ministerial Conference of the Forum on China-Africa Cooperation have all expressed support for China's successful hosting of the Games.。

"We look ahead to Beijing Winter Olympics and Paralympics 2022, as opportunities for competition for athletes from around the world, which serves as a symbol of humanity's resilience," read the G20 Rome Leaders' Declaration.。

The Beijing Winter Olympic Truce Resolution was adopted by consensus and co-sponsored by 173 Member States at the 76th session of the United Nations General Assembly. IOC president Thomas Bach has repeatedly expressed confidence in a successful Beijing 2022 and many chiefs of International Federations (IFs) have voiced support.。

The spokesperson noted that about 120 diplomatic envoys, senior diplomats and representatives of National Olympic Committees (NOCs) from more than 70 countries and regions attended the second briefing of the Beijing 2022 Olympic and Paralympic Winter Games online and offline. Juan Antonio Samaranch, chairman of the IOC's Beijing 2022 Coordination Commission, spoke highly of the Games preparations in a video address. In interviews with media, ambassadors voiced their confidence in a successful Olympic Winter Games and expectation for excellent performances of athletes worldwide.。

As the spokesperson said, all the preparations for the Games have been completed. All competition venues have finished construction and have gone through homologation by IFs, ready for hosting competitions. Ten international test events and three international training weeks have been or to be held from October to December this year, with over 2,000 athletes, team officials and technical officials coming to China.。

"We applied a unified high standard for the three competition zones and put health of participants as top priority. Through the test events and training weeks, we have gained experience in pandemic prevention and control measures including vaccination, COVID-19 test upon entry and closed-loop management," said the spokesperson, adding that Beijing's promise to engage 300 million people in winter sports is becoming a reality.。

"We have the confidence and ability to overcome the difficulties and challenges, successfully complete all preparatory works and deliver a simple, safe and splendid Olympic Winter Games," the spokesperson said. Enditem。

Possibility of further volcanic eruptions in Tonga can't be excluded, says expert******

The volcano in Tonga might go quiet after eruption, but the possibility of further explosions can't be excluded, a British expert on volcanoes said Tuesday.。

As rescue teams continued to head to the collection of islands in the Pacific Ocean, Professor Mike Burton from the University of Manchester told Xinhua in an interview that "Because the volcano is basically submarine, we don't know what's going on."

"Almost anything could happen, and we just have to wait and see at this point," said the volcanologist at the university's Department of Earth and Environmental Sciences.。

The eruption on Saturday propelled thousands of tons of ash high into the atmosphere and set off a tsunami. Many of the roughly 170 islands around Tonga are covered with a thick layer of volcanic ash.。

The Tonga volcano, hundreds of kilometers underwater, and around 65 kilometers from Tonga's capital, is something of a mystery, said Burton, who tries to understand when a volcano might erupt by measuring the flux and composition of the often deadly poisonous gases created by volcanic activity.。

"The latest eruption which occurred on January 15 is possibly the biggest eruption we've seen for the last 30 or 40 years. I say possibly, because there are still some question marks over exactly what happened," he said.。

"It appears to be contradictory in some ways. In one sense, there's a sign that this was a very powerful, very big explosion, as it appeared to have gone up very high into the atmosphere, up to about 35 kilometers in height," Burton said.。

"To get that high in the atmosphere, you normally need a huge amount of material to erupt. But instead there's observation suggesting there wasn't that much material that erupted. This comes from both looking at the ash fallout and from the amount of gas released," he added.。

Burton said whether the main eruption is a prelude to another big eruption is yet unknown.。

The impact of the Tonga eruption was felt as far away as in Peru and Japan, and it seems to have damaged Tonga in particular, he said, adding that as the eruption seems to have severed the only communication cable into Tonga, the magnitude of the damage suffered by Tonga is still sketchy.。

Looking to the immediate future, Burton said one of the biggest threats, which isn't immediately obvious, is the risk of a deadly lava flow if there are rainstorms.。

"You can imagine if you get lots of fine ash and coarser ash landing on the ground in depths of meters, and then there's big heavy rainfall, you can get big mud flows which can be very destructive," he warned.。

As for any risk to the wider area of the Pacific Rim, Burton said it might impact ozone concentrations.。

"Because there was obviously a big interaction with seawater, it may be possible there were some unusual chemicals which were injected in great amounts into the stratosphere, things like chlorine and hydrogen chloride. It is one of the gases which can destroy ozone," he said.。

Burton said the risk of a future tsunami hitting China was now unlikely.。

"The impact of the tsunami was within 24 hours or 36 hours of the actual eruption. Now that we're three days past the eruption, the likelihood is there is no more tsunami coming out from the eruption," he said.。

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