简介：LetZbeatopologicalspaceandmappingA2:Z→B(H)withclosedrangeR(A2)becontinuous.SomenecessaryandsufficientconditionsofthecontinuityofM-PinversesAz+aregivenin[1],[2].ItisoneofthemthatAZ+iscontinuousifanaonlyifAZ+islocallybounded.Inthispaper,wediscussthefollowingproblem:iflimAn=A0inB(H)and||An+||isunbounded(i.e.theabovenecessaryandsufficientconditionfails),whathinHwillmaketheequations:limAm+h=A0+horw-limAn+h=A0+hbetrue.Forthispurposethreetheoremsandanerrorestimationaregiveninthispaper.

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简介：看了阿狸的《Z小姐的勇气》，我想起了那个少年的执着，对爱情的执着。少年姓何，我们就叫他H先生。他喜欢的女孩子姓林，我们就叫她L小姐。H先生与L小姐一起走过最美好的小学时光。从最懵懂无知的学前班到一起留级的二年级到轮廓线较清晰的六年级。别人的小学时光是六七年或更少，而他们却慢吞吞地走了八年，也就这样，我有幸跟他们同级。老师留级留得对。

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简介：上周港股在激烈震荡中走高，国企指数偏弱，拖累大盘。特别是周三A股市场急剧下挫，为近年来所罕见，A股全线走低，即刻影响到H股价格。目前中资上市企业市值已达港股的50％，A＋H两地上市更使港股联动增强。

简介：AseriesofNi-Hrechargeablebatterieswithatrademarkof‘JJJ’weresuecessfullydevelopedbyJiangnanTribleJcorporation,GuangdongProvince,andwereputintobatchproductionthisyear.ResearchonNi-HbatteryisoneoftheimportantprojectsinChina’sNationalHigh-TechProgramm.ScientistsinTribleJCorp.startedtheresearchlastyear.Afternearlyoneyear’sarduouswork,theycom-pletedthelabworkontheprojectandcametothe

简介：ThemixedH2/H∞guaranteedcostcontrolproblemviastatefeedbackcontrollawsisconsideredinthispaperforlinearsystemswithnorm-boundedparameteruncertainty.Basedonthelinearmatrixinequality(LMI)approach,sufficientconditionsarederivedfortheexistenceofguaranteedcostcontrollerswhihcguaranteenotonlyaprespecifiedH∞disturbanceattenuationlevelononecontrolledoutputforalladmissibleparameteruncertainties,butalsotheworst-caseH2performanceindexontheothercontrolledoutputtobenomorethanaspecifiedbound.Furthermore,aconvexoptimizationproblemisformulatedtodesignanoptimalH2/H∞guaranteedcostcontroller.

简介：HandoverinDigitalVideoBroadcastingforHandhelds(DVB-H)aimstoprovidecontinuousmobilebroadcastingserviceswhenauseristravelingthroughcellboundaries.Agoodhandovercontrolcanimprovethepowerefficiencyandgainmuchbetterreceptionquality.ThisletterprovidesanovelapproachforDVB-HhandoverbasedonDVB-H/UniversalMobileTelecommunicationsSystem(UMTS)hybridnetwork,whichmovesthemainhandoverfunctionfromtheterminalstothenetworks,sothatitreducestheoperationcomplexityoftheterminalsandincreasesthepowersaving.WhentheterminalcannotreceivetheDVB-Hsignalinthetransmissionshadowareasorbecauseofsomeotherreasons,theUMTSnetworksmayofferthesameservicetouserstomaketheservicecontinuous.AstheUMTSnetworkshavethetopologyoftheDVB-Hnetworks,bycommunicatingwiththeterminals,theUMTSnetworkscanhelptheterminalstopredictthehandover,andavoidunnecessaryhandover.

简介：5月15日，新哈弗H8正式上市，售价为18．38万-23．18万元。新哈弗H8播载“2．0T＋8AT”超强动力组合，并对外观、内饰进行重新设计，同时新增ACC自适应巡航、LDW车道偏离预警、AEB自动紧急制动等高安全科技配置。新啥弗H8还新增全地形控制系统与博格华纳双速TOD智能四驱系统，同时对底盘悬架进行重新调校，脱困性能、操控稳定性全面提升。

简介：AbstractWe conducted environmental surveillance to detect avian influenza viruses circulating at live poultry markets (LPMs) and poultry farms in Guangxi Autonomous Region, China, where near the China-Vietnam border. From November through April 2017-2018 and 2018-2019, we collected environmental samples from 14 LPMs, 4 poultry farms, and 5 households with backyard poultry in two counties of Guangxi and tested for avian influenza A, H5, H7, and H9 by real-time reverse transcription-polymerase chain reaction (rRT-PCR). In addition, we conducted four cross-sectional questionnaire surveys among stall owners on biosecurity practices in LPMs of two study sites. Among 16,713 environmental specimens collected and tested, the median weekly positive rate for avian influenza A was 53.6% (range = 33.5% - 66.0%), including 25.2% for H9, 4.9% for H5, and 21.2% for other avian influenza viruses A subtypes, whereas a total of two H7 positive samples were detected. Among the 189 LPM stalls investigated, most stall owners (73.0%) sold chickens and ducks. Therefore, continued surveillance of the avian influenza virus is necessary for detecting and responding to emerging trends in avian influenza virus epidemiology.

简介：选用特殊值法解题，必须是题目的答案是唯一的．要选取符合题设要求且尽可能简单的数值，这是特殊问题在特殊条件下的一种非常规方法，其目的是使解题简单明了，出奇制胜，现举例如下：

简介：右值引用（RvalueReference）是对C＋＋语言的一个技术小扩展。有了它,程序员可以在逻辑上规避临时对象的无谓复制,即搬移语义（moveSemantics）,并可实现完美转发（perfectforwarding）。本文是对右值引用这个C＋＋语言新特性的概述。

简介：古希腊哲学家阿那克西米尼晚年的时候声望很高，拥有上千名学生。一天，这位两鬓花白的老者蹒跚着走进课堂，手中捧着一摞厚厚的纸张。他对学生说：“这堂课你们不要忙着记笔记，凡是认真听讲的人，课后我都会发一份笔记。请大家一定要认真听讲，这堂课很有价值!”

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简介：绝对值是有理数一章的重要概念之一,理解、掌握、应用好绝对值非常重要.要学好绝对值应把握以下几点.一、绝对值的两种表示方法(1)文字语言表示法.绝对值的概念:一个正数的绝对值是它本身,一个负数的绝对值是它的相反数,零的绝对值是零.(2)数学式子表示法.设a为任意有理数,则

简介：境外上市高破发率已经影响到国内一级市场估值。2018年年初开始,受到A股IPO政策的不稳定注和公司盈利性要求等影响,赴港和赴美上市企业增多,但这批企业目前多数已破发。据财新记者统计,赴港上市整体破发率超过七成,赴美上市的中资企业破发率也达到六成。

简介：摘要最值问题是初等数学的一类基本题型，也是教育教学的典型素材之一。解决和处理这类问题时如果能把握住基本想法和方法，再从多个角度着手，那么就既能拓展思想认识能力又能提高解题实践能力，对教育教学效果会起到巨大的推动作用。

简介：对于父母来说,抚养孩子是一种投资,希望年老后可以得到回报。但时至今日,这一观念正被前所未有地颠覆着。有关调查显示,中国有大约65%的家庭存在“老养小”现象,有30%左右的年青人基本靠父母供养。

简介：“我饿……”“我真饿……”“呜呜……我要饿死了!”杜小尹幽怨地看着眼前一个个吃饱喝足拿着餐盘鱼贯而出相互嬉笑的同学，摸摸自己干瘪瘪的肚子，开始了漫无止境的碎碎念。“Shutup!”高歌扯了扯杜小尹紧嘟着的小脸，两手抱拳神情严肃地说，“当初还不是你自己要来检查食堂的？还把我也拉来了。反正总有人要来，也总有人要饿肚子，就不要抱怨了!”顿了顿，又说：“可是我也好饿啊!”