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  • 简介:摘要为了减轻教务人员和辅导员的工作量,增强学生选课时的主动性和积极性,提高选课效率,研究和设计了采用SQLServer2000作后台数据库服务器,ASP.NET动态网页技术开发前台,ADO.NET技术进行数据库连接和操作,最后结合实际实现了基于BS模式选课系统。

  • 标签: 选课系统 B/S ASP.NET
  • 简介:在过去几十年,量子信息科学已经出现,基于独特量子特性的编码方式,使其具有独特的优势。现如今,世界各地都在积极研究,量子计算机也必然会大大提高计算能力。但是,迄今为止,尚未有完全成熟理论的量子计算机问世,本文将对相关的研究方法和趋势出总结和展望。

  • 标签: 量子计算机,原理,趋势
  • 简介:摘要本文采用湿化学法合成硫化铅(PbS)量子点(QuantumsDots)。主要研究了实验条件的变化,例如Pb2+/S2-和SDS(十二烷基磺酸钠)/CATB(十六烷基三甲基溴化铵)的摩尔比以及反应时间对PbS晶体结构和形貌尺寸的影响。实验结果表明当Pb2+/S2-和SDS/CTAB的摩尔比均为11,反应时间为10分钟时,我们能成功制备出尺寸大小约为3~5nm且单分散性较好的PbS量子点。

  • 标签: 硫化铅 量子点 反应物摩尔比 反应时间
  • 简介:随着表征着传统计算机性能的摩尔定律逐渐进入瓶颈,计算机领域的突破性革命也成为迫在眉睫的问题,而近年来兴起的量子计算机或将成为此领域突破的关键。本文通过从量子计算机的物理学原理入手,简述了量子计算机的基本原理及发展历史,并通过对比了经典计算机(classiccomputer)与量子计算机(quantumcomputer)的不同之处,分析量子计算机(quantumcomputer)的在未来可能的应用场景。同时对当前量子计算机(quantumcomputer)所存在的一些问题进行了探讨。

  • 标签: 量子计算机 量子力学 量子计算
  • 简介:NoImpaseforChina’sDevelopmentJianSongToday,Chinahasamorethan1.2bilionpeople,about22%oftheworld’stotal,whoarefedwiththegrainpr...

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  • 简介:IncreasinglyaWoman'sDisease¥ZhangKonglaiandWangYingAIDSisadeadlysexuallytransmitteddiseasecausedbythehumanimmuno-deficiencyvi...

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  • 简介:CHINA'SAGENDA21CHINA'SAGENDA21WhitePaperonChina'sPopulation,EnvironmentandDevelopmentinthe21stCenturyThefollowingareexcerptsf...

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  • 简介:Tibet’sPopulationandTibetanPopulationGuoDapingTheTibetannationality,oneofChina’smajorethnicgroups,hasinhabitedontheQinghaiTi...

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  • 简介:TasksforChina’sAgingProgrammeTheobjectivesofChina’sagingprogrammeareto“provideeconomicsupport,medicalandhealthcareservicesand...

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  • 简介:China'smalemarriagesqueezeanditspotentialconsequencehaveattractedmuchattentionandgivenrisetodebate,butmoststudiescontributethissqueezetosexstructureandneglecttheagestructure,andsomestudiesuseflawedmethodtostudythecontributionofagestructureinthissqueeze.InthispaperwedevelopanindicatorofSpousalSexRatio(SSR)andapplyadecompositionmethodintoageandsexstructure.BasedonthedatafromChina's2010censusandprojection,wepredictthatfrom2010to2020,theagestructurewillbethedominantfactorforChina'smalemarriagesqueeze,andfrom2020to2034,thecontributionofsexstructurewillbeincreasing,whereasthatofagestructurewillbedecreasing.From2034to2045,China'smalemarriagesqueezewillmainlyfromimbalancedsexstructure,andtheagestructurewillcontributelittleornegativelytoChina'smalemarriagesqueeze.

  • 标签: 挤压 中国 婚姻 年龄结构 性别结构 分解方法
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  • 简介:Withalargeworking-agepopulationwitharelativelylowaveragelevelofeducation,Chinaisfacingseverechallengesinemployment.Theseinclude:thecontradictionbetweenworkforcesupplyanddemand;irrationalemploymentstructure;increasingpressureontheurbanlabormarket;

  • 标签: 中国 劳动力就业 管理机制 政府职能
  • 简介:CONSTITUTIONOFTHEPEOPLE'SREPUBLICOFCHINACONSTITUTIONOFTHEPEOPLE'SREPUBLICOFCHINA(December4,1982)Article25TheStatepromotesfami...

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  • 简介:Tibet′sPopulation:PastandPresentTudengAfterTibetwasconqueredbytheMongolswhofoundedtheYuanDynasty(inthe13thcentury),ithassince...

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  • 简介:ChongqingBecomesChina’sNewMunicipalityTheestablishmentofChongqingMunicipalitywasdeclaredonMarch14,1997,whentheFifthSesionoft...

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  • 简介:OnNovember12,2013,theThirdPlenarySessionofthe18thCentralCommitteeoftheCommunistPartyofChina(CPC)officiallyissuedDecisiononSomeMajorIssuesConcerningComprehensivelyDeepeningtheReform,whichunderscoredtheimportanceofpromotingurbanizationofmigrantruralpopulation(transformingeligibleruralmigrants

  • 标签: 英语 阅读 理解 人口学
  • 简介:tatisticsonChina’1996SocialDevelopmentAlargesizesewagedisposalplantinFuzhouCity,FujianProvince.EducationalDevelopmentChinah...

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  • 简介:IntegrationofPopulationwithDevelopment:China'sPracticeIntegrationofPopulationwithDevelopment:China'sPracticeXiaoZili(Director...

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  • 简介:LAWOFTHEPEOPLE'SREPUBLICOFCHINAONTHEPROTECTIONOFRIGHTSANDINTERESTSOFWOMENLAWOFTHEPEOPLE'SREPUBLICOFCHINAONTHEPROTECTIONOFRIGH...

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