简介：无线传感器网络节点能量消耗,直接影响着节点和网络的使用寿命,传统无线传感器网络的S-MAC协议对所有的传感器节点都有一个固定的占空比,使其不能很好地适应网络流量的变化,而调整占空比时又会浪费能量或影响通信吞吐量。针对S-MAC协议的不足,文章提出一种能量优化效果较好的NSMAC协议。仿真结果表明:NS-MAC协议可在保证通信流量的条件下,通信能耗较S-MAC协议有明显的降低。

简介：AIM:ToevaluatetheeffectofOcimumsanctumleafextractonthedietarysupplementationinthetransgenicDrosophilamodelofParkinson’sdisease.METHOD:TheeffectofOcimumsanctumleafextractwasstudiedonthetransgenicDrosophilamodeloffliesexpressingnormalhumanalphasynuclein(h-αs)intheneurons.O.sanctumextractatfinalconcentrationsof0.0428×10-4,0.87×10-4,and1.85×10-4g·mL-1ofdietwereestablishedandtheflieswereallowedtofeedfor21days.Theclimbingassayandlipidperoxidationweretakenasparametersforthestudy.RESULTS:ThesupplementationofO.sanctumextractshowedadose-dependentsignificantdelayinthelossofclimbingabilityandreductioninoxidativestressinthebrainofPDmodelflies.CONCLUSION:TheresultsofthepresentstudyshowedthattheO.sanctumextractispotentinreducingthePDsymptomsintransgenicDrosophilamodel.

简介：随着信息化的发展，网络技术的日趋成熟，各大高校评估工作的进一步开展，评教系统作为保证高校的教学质量、动态监控教学情况、实现良好的教学质量保障体系应运而生，并发挥出巨大的作用。本文针对高等院校教师评教系统的设计与实现进行了深入的分析，希望能对高校的管理者提供有效的支持与帮助。

简介：摘要院本文介绍了一款以Java语言编写的基于B/S架构的数学实验考试系统软件。该系统集试题库、考试管理、教师随机调题、试题评分于一体，是一款适应性强，对硬件要求不高，功能强大，使用方便、小巧的实用性软件。

简介：TheAppellateBodyreportinJanuary2012hadsupportedthedecisionofPanelinthe"China-measuresrelatedtotheexportationofvariousrawmaterials"case(WT/DS394,395,398)andaffirmedthatChina’srestrictions(suchastariffsandquotameasures)ontheexportationofrawmaterialsviolatedrulesputforthbytheWTO,whichwererequiredtobemodified.InthiscaseChina’srighttoinvokeArticle20ofGATT1994("generalexception")tojustifyitsexemptionfromtheguidelinesinArticle11.3oftheWTOAccessionProtocolwasdeniedbythePanelandtheAppellateBody.ThiswasduetothefactthatthephrasinginArticle11.3ofProtocolfailedtomention"GATT."ThiswastheconsequenceofthetwointerpretationapproachestheDisputeSettlementBody(DSB)adopted-anarrowtextualinterpretationandasubjectivepresumptionof"legislativesilence."TheinappropriateuseofthetwomethodsofinterpretationleadtoanimbalancebetweentherightandobligationofChinaundertheadditionalobligationsthatwereimposeduponChinabytheWTO,whichcreateanegativeimpactonChina’srareearthcaseandtheprotectionofdomesticnaturalresources.

简介：Ingeneral,earthquakecyclerelatedtoearthquakefaultingcouldincludefourmajorprocesseswhichcouldbedescribedby(1)faultlocking,(2)self-accelerationornucleation(possibleforeshocks),(3)coseismicslip,and(4)post-stressrelaxationandafterslip.Asuddenstaticstresschange/perturbationinthesurroundingcrustcanadvance/delaythefaultinstabilityorfailuretimeandmodifyearthquakerates.Basedonasimpleone-dimensionalspring-sliderblockmodelwiththecombinationofrate-and-statedependentfrictionrelation,inthisstudy,wehaveapproximatelyderivedthesimpleanalyticalsolutionsofclockadvance/delayoffaultfailurescausedbyasuddenstaticCoulombstresschangeappliedinthedifferenttemporalevolutionperiodsduringanearthquakefaulting.Theresultshavebeenusedinthephysics-basedexplanationofdelayedcharacteristicearthquakeinParkfieldregion,California,inwhichthenextcharacteristicearthquakeofM6.0after1966occurredin2004insteadofaround1988accordingtoitscharacteristicreturnperiodof22years.Atthesametime,theanalyticalsolutionsalsoindicatethatthetimeadvance/delayinCoulombstresschangederivedbythedislocationmodelhasacertainlimitationandfundamentalflaw.Furthermore,wediscussedtheessentialdifferencebetweenrate-andstate-variableconstitutive(R–S)modelandCoulombstressmodelusedcommonlyincurrentearthquaketriggeringstudy,anddemonstratedthat,infact,theCoulombstressmodelcouldbeinvolvedintheR–Smodel.Theresults,wehaveobtainedinthisstudy,couldbeusedinthedevelopmentoftime-dependentfaultinteractionmodelandtheprobabilitycalculationrelatedtothetime-dependentandrenewalearthquakepredictionmodel.

简介：通过对B/S,C/S结构的对比分析,使用B/S结构作为广电光缆信息管理系统的架构模式.系统的功能为：对信息进行管理和分析,帮助制定针对性的网络管理维护计划,提供光缆网络建设辅助决策的参考依据.实行精细化和流程化管理有助于系统功能的进一步拓展.

简介：TheYangziPetrochemicalCompanyisthefirstoneamongdomesticaromaticsmanufacturerstoadopttheUOP’slatestnoveladsorbentduringqualityupgradingofitsNo.2xyleneunit.OnOctober23,2013thisunithasbeencontinuouslydeliveringxyleneproductwithapurityof

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简介：本文以汽车4S店为研究对象，基于服务质量相关理论提出了如何提高服务质量的对策建议，从而为广大4S店经营者就如何提高服务质量提供在理论上和策略上的探讨和借鉴。

简介：文章简要介绍77S管理法的内容，分析了山东省聊城市人民医院后勤服务中心的情况，详细阐述了7S管理法在该院后勤服务中心的具体应用以及取得的效果。

简介：摘要院随着全球经济的走低，提升企业竞争力、加速转型成为企业生存的关键，精益生产作为企业加强管理的重要手段被广泛应用。5S管理为强化现场管理提供了重要支撑，为精益生产、持续化改进夯实基础。

简介：Veryrecently,BelleannouncedtheirobservationofΥ(5S)!bJ!(J=0;1;2),indicatingthattheΥ(5S)!bJ!decaysalsohavelargedecaywidths,i.e.,themeasuredbranchratiosofΥ(5S)!bJ!are<3:410??3,(1:640:23+0:30??0:22)10??3,and(0:570:220:07)10??3withJ=0;1;2,respectively[1].ItshouldbenoticedthateventhoughthetreelevelcontributionstoΥ(5S)!bJ!(J=0;1;2)shouldbestronglysuppressedduetotheOkubo-Zweig-Iizuka(OZI)rule,suchlargedecaywidthsareobserved,whichagaininspiresourinterestinunderstandingsuchquantities.Inthiswork,weproposethatthecontributionfromthehadronicloopshouldbeconsideredinstudyingΥ(5S)!bJ!.

简介：摘要本系统是以单片机为核心，通过外扩键盘和显示器完成电子测量系统中“控制”和“显示”这两部分功能的。本论文详细地介绍了可编程键盘/显示器专用接口芯片8279的内部组成、工作原理、引脚功能以及它的三个可寻址的寄存器和工作方式，并介绍了矩阵式键盘的工作原理、键识别方法、键盘的中断工作方式和共阴极LED显示器的工作原理，在此基础上系统地介绍了单片机键盘显示接口扩展的硬件电路的设计以及该电路的工作原理。

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简介：首先要解题。房车，自然不是指TG最为痛恨欲除之而后快的露营车，而城市乡村大街小巷中最为普遍的五门三厢制式汽车，英语nqsedan或者saloon，德语名日Limousine，意大利语则唤作berlina。至于是四座还是五座倒也无关紧要，只要不是七座就都在此范畴内。说到究极，真不知这个词是什么时候开始变得非常流行，反正鄙人在偷工减料的学生生涯中就从没听闻。

简介：ByusingPDM-OFDM-16QAMmodulation,all-Ramanamplification,coherentdetection,and7%forwarderrorcorrection(FEC)threshold,wesuccessfullydemonstrate63-Tb/s(368×183.3-Gb/s)signalover160-kmstandardsinglemodefiber(SSMF)transmissionintheC-andL-bandswith25-GHzchannelspacing.368opticalchannelswithbandwidthspacingof25GHzaregeneratedfrom16externalcavitylasersources.After160-kmSSMFtransmission,alltestedbiterrorrate(BER)areunder3.8×10-3,whichcanberecoveredby7%FECthreshold.Withineachchannel,weachievethespectralefficiencyof6.85bit/s/HzinC/Lband.

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简介：Alzheimer’sdisease(AD)isoneofthemostdevastatingdiseasesaffectingthelifeandhealthofagingpopulation.TwohallmarksofADaresenileplaquesandneurofibrillarytangles,andADiswellknownforthemassivelossofneuronsandimpairedcognitivefunctionsespeciallymemoryloss.Despiteextensivesearchforeffectivetreatment,available

简介：近日，罗德与施瓦茨公司（R＆S）的多端口网络分析仪家族又加入了一位新成员：R＆SZNBT。该产品频率范围覆盖9KHz到8．5GHz，最基本配置配备4个端口。根据需求可以最多扩展到24端口。R＆SZNBT主要面向有源或无源多端口器件研发与生产，如现在热门的多模、多频手机射频前端模块。（来自R＆S）