当前位置:黑龙江地方站首页 > 龙江新闻 > 正文

成都市成华区妇幼保健院治疗地包天隐形矫正怎么样好吗预约分享成都新桥医院口腔中心

2019年05月21日 22:00:28    日报  参与评论()人

成都市牙套去哪里医院好成都市种植牙需要多少钱BEIJING — China launched the world’s first quantum communications satellite from the Gobi Desert early Tuesday, a major step in the country’s bid to be at the forefront of quantum research, which could lead to new, completely secure methods of transmitting information.北京——周二凌晨,中国从戈壁滩发射升空了全球首颗量子通信卫星。这是中国为争取站在量子研究最前沿而迈出的重要一步。量子研究可能会带来新的完全安全的信息传输方式。Researchers hope to use the satellite to beam communications from space to earth with quantum technology, which employs photons, or particles of light. That type of communication could prove to be the most secure in the world, invulnerable to hacking. Scientists and security experts in many countries are studying the technology.研究人员希望,通过量子技术,用这颗卫星将信息从太空传输到地球。量子技术会用到光子,也就是光的微粒。这种通信方式可能会明是全世界最安全、最不易受黑客攻击的。很多国家的科学家和安全专家在研究这项技术。The satellite is expected to circle the earth every 90 minutes after entering orbit at an altitude of about 310 miles, according to a report by Xinhua, the state news agency.官方通讯社新华社的一篇报道称,在进入距地面约500公里高的轨道后,这颗卫星预计每90分钟绕地球一圈。China’s many high-tech scientific endeavors, including its ambitious space program, have enormous backing from the central government. The country’s 13th Five-Year Plan, an economic blueprint that was announced in March, listed quantum technology as a focal point for research and development.中国的很多高科技科研活动,包括其宏大的太空计划,得到了中央政府的大力持。中国今年3月公布的有关经济发展蓝图的十三五规划纲要将量子技术列为一个研发重点。Traditional communications satellites send signals using radio waves. But a quantum communication satellite uses a crystal that produces a pair of entangled photons whose properties remain entwined even as one is transmitted over a large distance. Messages could be sent by manipulating these properties.传统的通信卫星使用无线电波发送信号。量子通信卫星用的则是一种结晶体,这种晶体会产生一对相互纠缠的光子。即便将其中一个传输到很远之外,它们的属性依然会纠缠在一起。可以通过控制这些属性来发送信息。An article about the Chinese program published by the journal Nature in July said any tinkering with quantum communications would be detectable, which is why the method is secure. “Two parties can communicate secretly,” the article said, and could be “safe in the knowledge that any eavesdropping would leave its mark.”今年7月,《自然》杂志(Nature)发表了一篇文章,介绍中国这个项目。文中称,对量子通信做手脚的任何行为都会被发现,而这正是这种方式安全的原因。文章说,“双方能够秘密交流”,并且“有一种安全感,因为知道任何偷听都会留下痕迹”。If China succeeds in its satellite launch, the article said, that could mean many more such Chinese satellites in orbit, “which will together create a super-secure communications network, potentially linking people anywhere.”文章表示,如果中国的卫星发射成功,可能意味着中国会把更多的这类卫星送上轨道,它们“合起来将构成一个超级安全的通信网络,可能会将任何地方的人连接在一起”。“But groups from Canada, Japan, Italy and Singapore also have plans for quantum space experiments,” the article said.“但加拿大、日本、意大利和新加坡的团队也有量子太空实验计划,”文章说。While the communication would be unbreakable, the data transmission rate would also, at least at first, be glacial, more akin to the telegraph than the internet.尽管这种通信方式可能固若金汤,但数据传输速率起码一开始会极慢,更像电报而非互联网。The Chinese researchers hope to use the satellite and quantum communications to establish secure transmissions between two ground sites. In theory, the satellite can provide the connection between them. The first major link in China would be between Beijing and Shanghai, and might open this year, according to Xinhua.中国的研究人员希望利用这颗卫星和量子通信,在地面上的两个地点之间建立安全的信息传输。理论上,它能够提供两地之间的联络。新华社称,中国最先实现这种联络的可能是在北京和上海之间,或许会于今年开通。The satellite, which weighs over 1,300 pounds, is called Quantum Experiments at Space Scale, or Quess, and nicknamed Micius, after a Chinese philosopher and scientist in the fifth century B.C.这颗卫星逾重600公斤,名叫量子科学实验卫星,英文缩写为Quess,昵称墨子号。这是为了纪念公元前五世纪的中国哲学家、科学家墨子。Pan Jianwei, the chief scientist of the quantum satellite project, told Xinhua earlier that the overall project involved building four ground stations for quantum communication and one station in space for experimental quantum teleportation.量子卫星项目的首席科学家潘建伟早前对新华社表示,整个项目涉及修建四座量子通信地面站,一座空间量子隐形传态实验站。A 2012 article in Nature said Mr. Pan was in his early 30s when, in 2001, he set up China’s first laboratory for manipulating the quantum properties of photons.《自然》杂志2012年发表的一篇文章称,在2001年,30岁出头的潘建伟创建了中国首个研究如何控制光子的量子属性的实验室。“The lucky thing was that, in 2000, the economy of China started to grow, so the timing was suddenly right to do good science,” Nature ed him as saying.“幸运的是,2000年,中国的经济开始起飞,因此进行高质量科学研究的时机突然到了,”《自然》杂志当时援引他的话报道。 /201608/461309崇州市妇幼保健院烤瓷牙全瓷牙瓷嵌体多少钱 成都私人牙科医院

泸州市人民医院牙齿根管治疗价格绵阳市第四人民医院口腔科 成都牙齿冷光美白怎么护理

蒲江县种植牙哪家医院好Chinese manufacturers reported sluggish business for a seventh month in a row, with a PMI ing for February which was worse than expected. 2月份,中国制造业采购经理人指数(PMI)逊于预期,显示出制造业已连续7个月陷于低迷。 The official manufacturing PMI for February came in at 49, compared to economists’ expectations of 49.4. It was 49.4 in January. 2月份的官方制造业PMI为49,比经济学家预期的49.4要低。1月份的制造业PMI为49.4。 The ing means the manufacturing sector has been shrinking for the past seven months. It is the lowest ing since November 2011, when it was also 49. 该读数意味着,中国制造业过去7个月一直处于收缩状态。该读数是2011年11月以来的最低读数,当时的读数也是49。 China recorded its weakest growth in a quarter of a century last year at 6.9 per cent. 去年,中国经济增长率为6.9%,是25年来的最低水平。 On Monday the central bank also opted for more easing, cutting the reserve ratio – or the share of customer deposits that banks must hold on reserve – to boost the availability of cheap credit to consumers and companies. It was also reported than almost 2m Chinese coal and steel workers will lose their jobs because of government policies to cut overcapacity, the majority of them likely to be in state-owned enterprises. 周一,中国央行决定进一步放松货币政策,下调了商业存款准备金率,以便让消费者和企业更容易获得廉价信贷。另有报道称,由于政府出台政策去除产能过剩,将近200万中国煤炭和钢铁工人将失去工作,其中大部分很可能都是国企工人。 The services PMI was 52.7, compared to a previous ing of 53.5. 中国官方务业PMI为52.7,前值为53.5。 The Caixin-sponsored composite PMI for February came in at 48, below expectations for 48.4. It had been 48.4 in January. 2月份,财新(Caixin)中国制造业PMI为48,比预期值48.4要低,1月份的读数为48.4。 The 50-mark separates contraction from expansion. The ing means the sector has been shrinking for a whole year now, and was its lowest in five months. 50为收缩与扩张的分水岭。2月份的财新PMI读数为5个月来的低点,而且意味着中国制造业过去一整年始终处于收缩状态。 The survey also noted that staff numbers declined at the sharpest rate since January 2009, as companies downsized to cut costs and did not replace voluntary leavers. 财新的调查还指出,随着企业压缩规模以节省成本,加上不再填补自愿离职员工的空缺,用工数量降至2009年1月以来最低。 He Fan, economist at Caixin Insight, said: The index ings for all key categories including output, new orders and employment signalled that conditions worsened, in line with signs that the economy’s road to stability remains bumpy. The government needs to press ahead with reforms, while adopting moderate stimulus policies and strengthening support of the economy in other ways to prevent it from falling off a cliff. 财新智库(Caixin Insight)首席经济学家何帆认为,2月财新中国制造业PMI中,产出、新订单、就业等关键分项指标均有所下探,表明中国经济仍处于反复震荡的探底阶段。当前阶段,政府应在继续推进改革的基础上,适度采取经济刺激政策,加大托底政策力度,避免经济出现断崖式下跌,引发经济动荡。 /201603/429557 四川牙齿矫正医院自贡市第四人民医院看牙齿戴牙套多少钱

四川美白牙什么价格
金牛区牙齿戴牙套多少钱
成都防磨牙牙套多少钱QQ健康
四川省第四人民医院治疗假牙价格
飞解答成都最好的牙科整形医院
金堂县做口腔医院哪家好
四川成都口腔医院种植牙的价格
四川烤瓷牙一般需要多少钱飞度云助手成都华西医院看牙齿美白的价格
同城网甘孜藏族自治州美白牙齿多少钱平安媒体
(责任编辑:图王)
 
五大发展理念

文化·娱乐

龙江会客厅

彭州冷光牙齿好吗
四川成都新桥牙科医院治疗口腔溃疡牙痛价格 四川新桥口腔医院治疗口腔种植牙齿美容多少钱平安活动 [详细]
成都做牙套需要多少钱
四川省纯钛烤瓷牙怎么样 成都人民医院牙科 [详细]
眉山冷光美白治疗多少钱
眉山市第二人民医院牙髓炎氟斑牙牙齿美容怎么样好吗 丽优惠德昌县人民医院美容冠要多少钱搜索新闻 [详细]
绵阳市妇幼保健院拔牙智牙口臭口腔溃疡多少钱
周网四川成都新桥牙科医院根管治疗氟斑牙怎么样好吗 成都市洗牙哪家医院好豆瓣频道成都哪里种植牙安全 [详细]