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褚朝阳

领域:tom网

介绍:脉冲星pulsar10月10日,中国科学院国家天文台宣布,500米口径球面射电望远镜(FAST)经过一年调试,已实现指向、跟踪、漂移扫描等多种观测模式的顺利运行,并确认多颗新发现脉冲星.Afteroneyearoftrialoperation,ChinasFive-hundred-meterApertureSphericalRadioTelescope(FAST),theworldslargestsingle-dishradiotelescope,hasidentifiedmultiplepulsars,theNationalAstronomicalObservatoriesofChina(NAOC)月10日,中国科学院国家天文台宣布,经过一年调试,500米口径球面射电望远镜(FAST)已发现多颗脉冲星.FAST是世界上最大的单口径射点望远镜.Twoofthepulsars,namedJ1859-01andJ1931-01,are16,000lightyearsand4,,respectively.新发现的脉冲星中有两颗分别为J1859-01和J1931-01,前者距离地球万光年,自转周期秒,后者距离地球4100光年,自转周期秒.据科学家介绍,脉冲星(pulsar)是一种高速自转的中子星(neutronstar),由恒星演化和超新星爆发产生.它的密度极高(superdensity),每立方厘米重达上亿吨,一块方糖大小就相当于地球上一万艘万吨巨轮的重量.脉冲星自转速度很快(fastrotationalspeed)、自转周期精确(accuraterotationperiod),是宇宙中最精准的时钟.这一特殊"本领",让脉冲星在计时、引力波探测(findinggravitationalwaves)、航天器导航(navigatingspacecraft)等领域具有重要应用.这两颗脉冲星J1859-01和J1931-01分别由"中国天眼"于今年8月22日、25日在南天银道面(thesoutherngalacticplane)通过漂移扫描(drift-scanning)发现.目前"天眼"已探测到数十个优质脉冲星候选体(promisingpulsarcandidates),其中6颗通过国际认证.对于观测范围可达已知宇宙边缘的"天眼"来说,发现脉冲星只是使命之一,未来,它还将在中性氢观测(neutralhydrogenobservation)、谱线观测(spectrumobservation)、寻找可能的星际通讯信号(explorationofinterstellarcommunicationsignals)等方面大放异彩.2016年9月25日,我国500米口径球面射电望远镜(FAST)正式落成启用,位于贵州省平塘县名为大窝凼的喀斯特洼地(naturallydeepandroundkarstdepression)之中.其接收面积(receivingarea)相当于30个足球场大鞘澜缱畲蟮牡タ诰渡涞缤毒射电望远镜(radiotelescope)接收的是肉眼看不到的射电波(radiowaves),跟接收卫星信号的天线锅类似,通过锅的反射聚焦,把几平方米到几千平方米的信号聚拢到一点上.因此,FAST的工作不是"看",而是"听",依靠500米口径的"大耳朵"来"收听"太空深处物体发出的无线电波....

张良器

领域:红网

介绍:  XuMei(C),spokespersonofChinasMinistryofEducation,attendsapressconferenceinBeijing,capitalofChina,June3,2019.(Xinhua/JinLiangkuai)BEIJING,June21(Xinhua)--AstudentintheeliteUniversityofScienceandTechnologyofChina(USTC)hasplannedtopursuefurtherstudiesintheUnitedStatesforalongtime,however,hishopesanddreamsultimatelycametoastandstill,notbecauseofhisacademicperformance,butbecauseofwherehe,whochosetospeakusingapseudonameasWuFang,,,China,extendingvisareviewtime,,technology,engineeringandmathlikeWuhavebeendisproportionatelyaffectedbytherestrictionssincelastyear,accordingtoYangXinyu,ministercou,confusionaboutthevisarequirementsandcallsfromstudiesoverseasalongtimeago,butnowtheyarehavingdoubtsabouttheirchoices."SomeevenworrytheycannotgetavisabecausetheyreceivedscholarshipsfromHuawei,",300pe,,,aphysicsprofessorwithUSTC,saskedtosubmitadditionalinformationsuchasdetailsaboutfamilymembers,addressesandsocialmediaaccountsusedinthepast15years."Tome,itlooksmorelikegatheringpersonalinformation,",viceprovostforglobalengagementandinterdisciplinaryacademicaffairsoftheUniversityofMichigan,saidtheirstudentsandfacultyofChineseheritageareconcernedthecreationofbarriersto,sevenAmericanuniversitiesincludingYale,Stanford,,h,preside,ncethemiddleofthelastcentury."ImdeeplytroubledthatmanyaroundtheglobenowperceiveAmericaasbeinglesswelcomingtotalentedstudentsandresearchers,"(analiasusedtoavoidvisaproblems),asenioratUSTC,,Wangsaid,asseniorswhowenttherealwayspassedontheirexperiencesab-,000Chinesestudentsinthe2017-2018academicyear,,tosomedegree,,ChinasmajorEnglishtrainingagency,,amajoroverseaseducationalcounselingserviceproviderinChina,,(),theviceprovostfromtheUniversityofMichigan,ercountries,includingCanada,,thoughheandmanyofhisclassmatesrecognizetheirhigh-qualityresearchlevelsandacademicenvironment."Itsdisheartening,notbecauseoftheschools,butbecauseofgovernmentpolicies,"saidWang.

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e7o | 2019-11-19 | 阅读(985) | 评论(155)
GENEVA,June20(Xinhua)--IOCPresidentThomasBachsaidThursdaythathehasnoconcernatallaboutthe2022BeijingWinterOlympicGames,BeijingwintergamesonThursday,BachsaidthatBeijing2022hadonceagainemphasizedthatthemainm"usingsportsasameansforhealthtomaketwoorthreehundredmillionChinesefamiliarwithwintersports,"Bachsaid,addingthatevenasmallpercentageofthesepeoplepracticingandcontinuingtopracticewintersportswouldbemultiplyingtheparticipationinwintersportsworldwide,,Bachgaveaquiteshortandfirmresponse,"NO!"HesaidalltheinfrastructureforBeijing2022arewellunderwayandontime,andabout3,200eliteChineseathletesarepreparingforqualificationsthatcoverall109eventsofthewintergames."TheIOChasgreatsatisfactionwiththeinnovativeapproachwithregardtosustainability(ofBeijing2022),forexample,inicemakinginparticular,salsogreatprogressinmarketingcombinedwithgreatdisciplineonthebudget,",theorganizingcommitteeofBeijing2022isworkinginaverydiligentway,andthecooperationbetweentheorganizationcommitteeandthecoordinationcommissionisreallyseamless,accordingtotheIOChead."Anyissuewhichmayarise,andtherearealwaysissuesduringthepreparation"willbesolvedwithteamspiritinacooperativeway,s,whenheistodeliveracoremessagetoworldleadersthattheunifyingpoweroftheOlympicGamesis"theonlyeventintheworldwhichbringstogetherathletesfromallthe206IOCmembersandtheIOCrefugeeOlympicteam,inapeacefulcompetitionandlivingtogetherinonevillage,respectingthesamerules.""Ingeneral,therelationbetweensportandthegovernmentsshouldbeoneofmutualrespectofeachother,andsportrespectstherulesandlawsofacountryandtheinternationalcommunity,"heconcluded.【阅读全文】
iec | 2019-11-19 | 阅读(116) | 评论(105)
GENEVA,June20(Xinhua)--IOCPresidentThomasBachsaidThursdaythathehasnoconcernatallaboutthe2022BeijingWinterOlympicGames,BeijingwintergamesonThursday,BachsaidthatBeijing2022hadonceagainemphasizedthatthemainm"usingsportsasameansforhealthtomaketwoorthreehundredmillionChinesefamiliarwithwintersports,"Bachsaid,addingthatevenasmallpercentageofthesepeoplepracticingandcontinuingtopracticewintersportswouldbemultiplyingtheparticipationinwintersportsworldwide,,Bachgaveaquiteshortandfirmresponse,"NO!"HesaidalltheinfrastructureforBeijing2022arewellunderwayandontime,andabout3,200eliteChineseathletesarepreparingforqualificationsthatcoverall109eventsofthewintergames."TheIOChasgreatsatisfactionwiththeinnovativeapproachwithregardtosustainability(ofBeijing2022),forexample,inicemakinginparticular,salsogreatprogressinmarketingcombinedwithgreatdisciplineonthebudget,",theorganizingcommitteeofBeijing2022isworkinginaverydiligentway,andthecooperationbetweentheorganizationcommitteeandthecoordinationcommissionisreallyseamless,accordingtotheIOChead."Anyissuewhichmayarise,andtherearealwaysissuesduringthepreparation"willbesolvedwithteamspiritinacooperativeway,s,whenheistodeliveracoremessagetoworldleadersthattheunifyingpoweroftheOlympicGamesis"theonlyeventintheworldwhichbringstogetherathletesfromallthe206IOCmembersandtheIOCrefugeeOlympicteam,inapeacefulcompetitionandlivingtogetherinonevillage,respectingthesamerules.""Ingeneral,therelationbetweensportandthegovernmentsshouldbeoneofmutualrespectofeachother,andsportrespectstherulesandlawsofacountryandtheinternationalcommunity,"heconcluded.【阅读全文】
qg5 | 2019-11-19 | 阅读(627) | 评论(450)
类脑brain-inspiredintelligenceChinaNationalEngineeringLaboratorywasrecentlysetupbytheUniversityofScienceandTechnologyofChina(USTC)inHefei,AnhuiProvincetodevelopAItechnologybylearninghumanbrainmechanisms.中国科技大学日前在安徽省合肥市成立国家工程实验室,将借鉴人脑机制攻关人工智能技术.类脑(brain-inspiredintelligence)是人工智能(AItechnology)发展的重要途径,通过发展类脑智能可以揭示人脑信息处理的途径(waysofinformationprocessinginthehumanbrain),有利于完备智能技术体系,推动我国智能产业发展.由中国科技大学牵头,复旦大学、中科院沈阳自动化所、中科院微电子所和百度公司共同建设的该研究平台将支撑开展类脑认知与神经计算(brain-inspiredcognitiveandneuralcomputing)、类脑芯片与系统(brain-inspiredchipsandsystem)、类脑智能机器人(brain-inspiredintelligentrobots)等技术的研发与工程化.类脑实验室主任、中国科技大学信息学院执行院长吴枫介绍,目前类脑智能的发展面临三大瓶颈,即脑机理认知不清楚(brainmechanismcognitionisnotclear)、类脑计算模型和算法不精确(thebrain-inspiredcomputingmodelandalgorithmisnotaccurate)、计算架构和能力受制约(thecalculationstructureandcapacityisconstrained),类脑实验室将围绕这三大瓶颈展开攻关.相关词汇virtualreality(VR)虚拟现实augmentedreality(AR)增强现实artificialintelligence(AI)人工智能humanoid仿真机器人【阅读全文】
aec | 2019-11-19 | 阅读(378) | 评论(730)
BEIJING,June22--ChinesePresidentXiJin,thetwocountrieshavebeenadheringtothespiritofmutualrespect,treatingeachotheronanequalfooting,mutualbenefitandwin-wintopushforwardhealthyandstabledevelopmentofthebilateralrelationsandscoredfruitfulachievementsinexchangesandcooperationinvariousfields,teconductedin-depthandfriendlyexchangesandmappedoutablueprintofChina-Irelandrelations,sbetweenChinaandIrelandandstandsreadytomakejointeffortswithPresidentHigginstoliftthemutuallybeneficialstrategicpartnershiptoanewstagetobenefitthetwocoun,Higginssaidinamessagethat,overthelastfourdecades,thebilateraltieshavebecomeevenstrongerastimegoesbyandprtherexplorepotentialsforpragmaticcooperation,boostcoordinationonsafeguardingmultilateralismandotherglobalaffairsandpromotetheIreland-Chinatiestowardfurtherdevelopment,,ChinesePremierLiKeqiang,withtheopportunityofthe40thanniversaryoftheestablishmentofdiplomaticties,isreadytoworkwithIrelandtopushthetwocountriesmutuallybeneficialstrasreformandopeningupandachievementsindevelopmentcarryglobalsignificance,notingthattheIrishsidewillcontinuetofullydevelopIreland-Chinapartnershipbasedonthespiritofmutualrespect.【阅读全文】
gaa | 2019-11-19 | 阅读(484) | 评论(577)
LOSANGELES,June21(Xinhua)--Atwin-engineskydivingaircraftcrashedFridayeveningnearanairfieldontheHawaiianislandofOahu,killingallninepassengersonboard,localauthoritiesconfirmed."WithextremesadnessHDOTreportstherewere9soulsonboardtheKingAirtwinengineplanethatwentdownnearDillinghamAirfieldwithnoapparentsurvivors,"ivedthefirstcallofthedownedcraftatabout6:(0830GMT)andwhenfirefightersarrived,,partoftheHawaiianislandchainandhometothestatecapital,Honolulu.【阅读全文】
4ca | 2019-11-18 | 阅读(23) | 评论(948)
LHASA,June20(Xinhua)--AnartmuseumdedicatedtostonecarvingshasopenedinthecityofXigazeinsouthwestChina’,thefirstofitskindinTibet,featuresmorethan60originalstonecarvingworksandreproductions,30rubbings,aswellasover20stonecarvingcrafts,showcasingtheartforminTibetfromtheseventhtothe19thcentury."InTibet,stonecarvingartiswidespreadandhasalonghistory,"saidKalwang,anofficialwiththeXigazeculturalbureau."Withgreathistoric,artisticandscientificvalue,thesesplendidstonecarvingworksareawindowintothetraditionalandethniccultureofTibet."TheopeningofthemuseumistheculminationofyearsofeffortsbyTibet’sartresearchersonsurveying,collectingandpreservingartworksofstonecarvings."MostofthestonecarvingsinTibetwereengravedonslatesorprecipicesandwerevulnerabletodamageanderosion,"saidKalwang."Weopenedthemuseumtoraisepeople’sawarenessonpreservingstonecarvings,hopingtokeeptheartformalive."【阅读全文】
y4c | 2019-11-18 | 阅读(853) | 评论(888)
空巢青年empty-nestyouthsChinahasover20million"empty-nest"youths(youngpeoplelivingwithouttheirfamilies)aged20to39,andmostofthemliveinmajorcities,,Shenzhen,一份报告显示,国内20岁至39岁的独居者约有2000万.这些年轻人远离故乡、亲人,独自在城市打拼,他们被称为"空巢青年".Peoplewith"empty-nest"syndromeusedtsdefinitionhasbeenstretchedinChinaasmoreyoungfolklivealoneawayfromtheirhometowns."空巢綜合症"原指子女离家所带给父母心理上的适应问题.现在,这一现象也普遍存在于背井离乡、在大城市生活的单身青年之中.Relatednews:【阅读全文】
5gc | 2019-11-18 | 阅读(433) | 评论(39)
环亚手机版水陆两栖飞机amphibiousaircraftChinashomegrownAG600,codenamedKunlong,slargestamphibiousaircraftinproduction.我国研发的"鲲龙"AG600飞机12月24日进行首飞.这是全世界在研最大的水路两栖飞机."鲲龙"AG600是我国为满足森林灭火(forestfirefighting)和水上救援(marinerescue)的迫切需要,首次研制的大型特种用途民用飞机,是国家应急救援体系建设急需的重大航空装备.森林灭火时,它可多次往返高效率投水灭火,20秒内可一次汲水12吨(collect12tonsofwaterin20seconds),单次投水救火面积可达4000余平方米,接近一个足球场的面积.海上救援时,"鲲龙"可快速响应、到达,在复杂气象条件下实施救援,起降抗浪能力不低于2米,可一次救助50名海上遇险人员(carry50peopleduringsearch-and-rescuemissions).AG600除了满足森林灭火和水上救援要求,还能根据用户的需要加改装必要的设备,执行海洋环境监测与保护(marineenvironmentmonitoringandprotection)、资源探测(resourcessurveying)、岛礁运输(personnelandsupplytransportation)等任务,以及为"一带一路"提供海上航行安全保障和紧急支援等任务.AG600坚持自主创新,以国内供应商配套为主,全机5万多个结构及系统零部件中98%由国内供应商提供(98percentoftheAG600s50,000-pluscomponentsaresuppliedbyChinesecompanies),全机机载成品95%以上为国产产品."鲲龙"与我国运—20大型运输机(theY-20transportplane)、C919大型喷气式客机(theC919jetliner)一起,被称为中国大飞机"三剑客".运20和C919分别于2013年和2017年成功首飞.【相关词汇】水陆两栖飞机amphibiousaircraft首飞maidenflight战略运输机strategictransportplane喷气式客机passengerjetliner无人机unmannedaerialvehicle(UAV)预警指挥机airborneearlywarningandcontrol(AEWC)aircraft舰载机carrier-basedaircraft歼击机fighterjet【阅读全文】
k5g | 2019-11-18 | 阅读(775) | 评论(924)
ThepairanalysedthescoresfromastandardIQtestofover730,000men–whoreportedfornationalservicebetween1970and2009.他们分析了73万多人的标准智商测试成绩,这些人是在1970年到2009年间因为服兵役而接受测试的。【阅读全文】
qe3 | 2019-11-17 | 阅读(398) | 评论(879)
Asanationalweb-basedTVbroadcaster,,,integr(web-TV)serviceprovider,,coveringlocalaswellasinternationaleventsinawidevarietyofareas,rangingfrompolitics,economyandsocietytocultureandsports,,ndly,highly-efficient,,VOD,fileupload,,reprocessingandfragmentingtraditionalTVprogrammingresources,aswellasproducinganddisseminatingoriginalinternetprograms().ritizesuserfeedback,enablingnetizensbeapartofafruitfulproces,,andequippedwithaglobalized,multilingualandmulti-terminalcontentdistributionsystemtotransmithigh-qualityinternetprogramst:BlkD,Wanghailou,(Central),HaidianDistrict,BeijingPostcode:100142Tel:86-10-88046666【阅读全文】
ucq | 2019-11-17 | 阅读(941) | 评论(295)
环亚手机版两项英国研究显示,智商成绩下降的幅度为每十年到分。【阅读全文】
aqq | 2019-11-17 | 阅读(377) | 评论(129)
四川省珙县珙泉镇一名居民新京报记者,感觉到明显的震感,自己家房子也有发生倒塌,附近一家三层的农家乐倒塌。【阅读全文】
msc | 2019-11-17 | 阅读(786) | 评论(450)
环亚手机版HousepricesinChinasmajorcitieslargelyremainedstablelastmonthamidthecountrystighteningcontroloftherealestatemarket,,newhousepricesinfourfirst-tiercities--Beijing,Shanghai,,,saidtheNationalBureauofStatistics(NBS),pricesofresoldhousesinfirst-andsecond-tiercitiesregisteredslowe,,,tiatedrealestatepoliciesinMaybasedonlocalconditions,contributingtothestabledevelopmentofChinaspropert,,,(),,achiefanalystwiththerealestateagencyCentalineProperty,partiallyattributedtheslowergrowthofthepro,ChinashousingregulatoralertedfourChinesecitiesovermarkedhousingpricerisesinthepastthreemonths,urginglocalgovernmentstotakemecingsuchascapitalinflowsthroughshadowbanksandloanmisappropriation,accordingtoadocumentrelscontinuouseffortstosupportthesounddevelopmentofthepropertymarketundertheprincipleof"housingisforlivingin,notforspeculation."Chinashousingsalesandpricesareexpectedtoremainstableinthesecondhalfofthisyear,withpossibleslowerincreasesinrealestateinvestmentandconstruction,accordingtoareportbytheChinaInternationalCapitalCorporationLimited.【阅读全文】
3yw | 2019-11-16 | 阅读(382) | 评论(142)
StuartRitchie,apsychologistattheUniversityofEdinburghwhodidnottakepartintheresearch,toldthenewspaper:ThisisthemostconvincingevidenceyetofareversaloftheFlynnEffect.爱丁堡大学的心理学家斯图亚特·里奇告诉《泰晤士报》说:“这是弗林效应逆转的最令人信服的证据。【阅读全文】
e3y | 2019-11-16 | 阅读(936) | 评论(569)
,Chinahasstatedthatalthoughitdoesn’twantatradewar,’,“Chinaisdoomedtofail”.There’snodoubtthatthetradedisputewillnegativelyaffectChina’seconomy,butthosewhobelieveinChina’,tyandp,professoranddirectoroftheCenterforSustainableDevelopmentatColumbiaUniversity,saidthat“Chinaisnotanenemy”,addingthat“therealbattleisnotwithChinabutwithAmerica’sowngiantcompanies”.ThePetersonInstituteforInternat,asumthatwillriseto2,200dollarsif25“Trumprecession”.,whichtriggeredstrongoppositionfromitstradepartners,,,:areyoureadyWeshouldnotturnablindeyetodifficulties,,butanunwisedecisionthatwilleventuallyplaceChinesepeopleinlo’“Chinaisdoomedtofail”;atthesametime,,,,wehaveonethingtosay:fearisnotinourvocabulary.【阅读全文】
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