简介：故障现象：一辆SLK230在事故后出现硬顶不能正常收回。车辆损坏主要在右前方,因为侧撞造成右前羊角扭曲变形．相应的造成右前车身向后和向左偏移，对右前车身进行了修复。修复后发现硬顶收拢时不能到位，但有时却能正常收拢，当收不到位时换挡杆旁边的车顶按钮一直闪烁着红色的灯。

简介：纵观全球豪华车市场,有会员资格的车厂本就不多,无论是造车工艺、舒适配备、科技水准、性能操控,各家的差距并不明显,如果真要分个高下,也就是各家对造车的理解不同所造成的。然而,在这些顶尖高手都各自拥有独门绝技的条件下,谁才是这些领袖座驾的决胜关键?我们认为,谁真正领导了车界潮流,谁真正制定了级距标准,谁才是真正的NO.1。这个地位非MERCEDES-BENZ莫属。

简介：目的：分析糖尿病患者心电图异常改变及特点。方法：选取我院收治的糖尿病患者230例为观察对象,行常规心电图检查,对心电图进行比较分析。结果：230例患者中心电图异常124例,异常率为53.91%,其中ST-T改变占23.39%（29/230）,窦性心动过速占20.16%（25/230）,室性早搏占15.32%（19/230）。结论：糖尿病患者并发心血管病变患者心电图异常检出率较高,临床应定期对糖尿病患者进行心电图检查,并动态观察分析,对预防和早期治疗糖尿病并发冠心病有重要意义。

简介：摘要电力无线专网系统具备电力业务所需的广覆盖、大容量、高可靠、高速率、实时性强、安全性强、频谱适应性强、灵活易扩展等特性，可以广泛的适用于电力配用电业务数据的承载,为配电自动化、用电信息采集、配变监测、分布式电源、电动汽车充电桩、负荷控制、应急通信、智能台区等各类业务提供完善的无线通信解决方案。本文重点阐述了LTE230MHz无线专网系统在电力各类业务中的应用。

简介：号百地图是以社区消费为核心，模仿号码百事通挖掘和整合企业商户号码资源的商业模式，整合中国电信现有商户的号码、地理位置等信息，以电子地图为载体，提供比Google地图、百度地图更丰富的中小商户的信息，从而为个人用户提供基于其所在位置0．5—2公里半径范围内的“社区消费”索引服务，填补号码百事通网站在社区消费领域的空白。

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简介：狐狸家庭可爱的猫、小小的老鼠和聪明的狐狸住在一个大家庭中。

简介：“夫”字除同“大”读外有两读。读时，用为名词，指成年男子，如“一夫不耕，或受之饥”（贾谊《论积贮疏》）；又指女子的配偶，如“于是夫负妻戴”（《庄子·让王》）。读时，用为代词或语气词。作代词者如“则夫二人者，鲁国社稷之臣也”（《左传·成公十六年》），相...

简介：世界上没有一蹴而就的成熟品牌和名牌，任何品牌的发展与成熟都有一个否定之否定的过程，即螺旋式上升的过程。

简介：本文讨论，f(f^（k）)^n的值分布的定量估计并改进了C.K.Tsc与C.C.Yang的一个结果。

简介：在上海市第二届数学竞赛的试题中有一非常有趣的方程求解问题:试求方程的正根,并证明只有一个正根。这使人联想起诸如等方程。这些方程非常整齐,都能化为

简介：Offshorestructureswillencounterseriousenvironmentalload,soitisimportanttostudythestructuralsystemreliabilityandtoevaluatethestructuralcomponentsafetyrank.Inthispaper,thebracnch-and-boundmethodisadoptedtosearchthemainfailurepath,andtheDitlevsenboundmethodisusedtocalculatethesystemfailureprobability.Thestructureisthenassessedbythefuzzycomprehensiveassessmentmethod,whichevaluatesthestructuralcomponentsafetyrank.Theultimateequationofthetu-bularcross-sectionisanalyzedonthebasisofultimatestregnthanalysis.Theinfluenceofeffectcoefficientsonthestructuralsystemfailureprobabilityisinvestigated,andbasicresultsareobtained.Ageneralprogramforspatialframestructuresbymeansoftheabovemethodisdeveloped,andverifiedbythenumericalexamples.

简介：AbstractObjective:To evaluate the agreement and reliability of intrapartum nonreasurring cardiotocography (CTG) interpretation and prediction of neonatal acidemia by obstetricians working in different centers.Methods:A retrospective cohort study involving two tertiary hospitals (The First Affiliated Hospital of Sun Yat-sen University and Perking University Third Hospital) was conducted between 30th September 2018 and 1st April 2019. Six obstetricians from two hospitals with three levels of experience (junior, medium, and senior) reviewed 100 nonreassuring fetal heart rate (FHR) tracings from 1 hour before the onset of abnormalities until delivery. Each reviewer determined the FHR pattern, the baseline, variability, and presence of acceleration, deceleration, sinusoidal pattern, and predicted whether neonatal acidemia and abnormal umbilical arterial pH < 7.1 would occur. Inter-observer agreement was assessed using the proportions of agreement (Pa) and the proportion of specific agreement (Pa for each category). Reliability was evaluated with the kappa statistic (k-Light’s kappa for n raters) and Gwet’s AC1 statistic.Results:Good inter-observer agreement was found in evaluation of most variables (Pa>0.5), with the exception of early deceleration (Pa= 0.39, 95% confidence interval (CI): 0.36,0.43). Reliability was also good among most variables (AC1 > 0.40), except for acceleration, early deceleration, and prediction of neonatal acidemia (AC1 = 0.17, 0.10, and 0.25, respectively). There were no statistically significant differences among the three groups, except in the identification of accelerations (Pa = 0.89, 95% CI: 0.83,0.95; Pa= 0.50, 95% CI: 0.41,0.60, and Pa= 0.35, 95% CI: 0.25,0.43 in junior, medium and senior groups, respectively) and the prediction of neonatal acidemia (Pa= 0.52, 0.52, and 0.62 in junior, medium and senior groups, respectively), where agreement was highest and lowest in the junior-level group, respectively. The accuracy and sensitivity of the prediction for umbilical artery pH < 7.1 were similar among the three groups, but the specificity was higher in the senior groups (93.68% vs. 92.53% vs. 98.85% in junior, medium and senior groups, P= 0.015).Conclusion:Although we found a good inter-observer agreement in the evaluation of the most basic CTG features and FHR category statistically, it was insufficient to meet the clinical requirements for "no objection" interpretation for FHR tracings. Further specialized training is needed for standardized interpretation of intrapartum FHR tracings.

简介：Thispaperproposesagraphical-basedmethodologytoevaluatetheperformanceofamanufacturingsystemintermsofnetworkmodel.Wefocusonamanufacturingsystemwhichconsistsofmultipledistinctproductionlines.Atransformationtechniqueisdevelopedtobuildthemanufacturingsystemasamanufacturingnetwork.Insuchamanufacturingnetwork,thecapacityofeachmachineismultistateduetofailure,partialfailure,ormaintenance.Thus,thismanufacturingnetworkisalsoregardedasamultistatenetwork.Weevaluatetheprobabilitythatthemanufacturingnetworkcanmeetagivendemand,wheretheprobabilityisreferredtoasthesystemreliability.Asimplealgorithmintegratingdecompositiontechniqueisproposedtogeneratetheminimalcapacityvectorsthatmachinesshouldprovidetoeventuallysatisfydemand.Thesystemreliabilityisderivedintermsofsuchcapacityvectorsafterwards.ApracticalapplicationinthecontextofICcardmanufacturingsystemisutilizedtodemonstratetheperformanceevaluationprocedure.

简介：Thispaperpresentsafactoringalgorithmforcomputingsource-to-Kterminal(SKT)reliability,theprobabilitythatasourceacansendmessagetoaspcifiedsetofterminalsK,inacyclicdirectednetworks(AD-networks)inwhichbothnodesandedgescanfail,BasedonPivotaldecompositiontheorem,anewformulaisdevivedforcomputingtheSKTreliabilityofAD-networks.ByestablishingatopologicalpropertyofAD-networks,itisshownthattheSKTreliabilityofAD-networkscanbecomputedbyrecursivelyapplyingthisformula,TwonewReliabilityPreservingReductionsarealsointroduced.Therecursiontreegeneratedbythepresentedalgorithmhasatmost2^(|V|-|K|-|C|leafnodes,where|V|and|K|arenodessatisfyingsomespecifiedconditions.ThecomputationcomplexityofthenewalgorithmisO(|E|·|V|·2^(|V|-|K|-|C|)intheworstcasewhere|E|isthenumberofedges.Forsource-to-all-terminal(SAT)reliability,itscomputationcomplexityisO(|E|).ComparisonofthenewalgorithmwiththeexistingonesindicatesthatthenewalgorithmismoreefficientforcomputingtheSKTreliabilityofAD-networks.

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简介：Theobjectiveofthisworkistoanalyzethefatiguereliabilityofcomplexweldedstructurescomposedofmultipleweb-framejoints,accountingforcorrelationeffects.Athree-dimensionalfiniteelementmodelusingthe20-nodesolidelementsisgenerated.Alinearelasticfiniteelementanalysiswasperformed,hotspotstressesinaweb-framejointwereanalyzedandfatiguedamagewasquantifiedemployingtheS-Napproach.Thestatisticaldescriptorsofthefatiguelifeofanon-correlatedweb-framejointcontainingseveralcriticalhotspotswereestimated.Thefatiguereliabilityofaweb-framejointwasmodeledasaseriessystemofcorrelatedcomponentsusingtheDitlevsenbounds.Thefatiguereliabilityoftheentireweldedstructurewithmultipleweb-framejoints,modeledasaparallelsystemofnon-correlatedweb-framejointswasalsocalculated.

简介：WeintroducetherelationshipbetweenexcessnoiseinOptoelectronicCoupledDevices(OCDs)andtheirinteriordefectsandexplainhowlow-fiequencynoisecanbeusedtoestimatetheirreliability.Usingconceptsfromthebiologicalimmunesystemanditsprocessofidentifyinginvaders,wepresentasystemforestimationofthereliabilityofOCDs.Thesystemhasexpressionsfortheantigen(excessnoise),lymphocyte(criterion)andtheroleofthelymphocyteeliminatingunreliabledevices.AgeneticalgorithmwasusedtoestimatethecomponentsparametersofthenoisespectrumforestimatingthereliabilityofOCDs.Theexperimentalresultsdemonstratedthatthismethodisreliable,adaptableandpractical.

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简介：Inthispaper,reliabilityanalysisfortheoffshorejacketplatformwiththeinteractionofstructure-pile-soilunderextremeenvironmentalloadsiscarriedout.Theinherentuncertaintiesoftheenvironmentalload,foundationsoil,platformitself,andcalculatingmodelsareevaluated.Theactionofextremeloadsontheoffshoreplatformismodeledasafunctionofextremewaveheight.Thesystemcapacityofthewholeplatformisdeterminedbynonlinearpushoveranalysis,andtherelevantprobabilitypropertyisobtainedbythesimulationmethod.Thereliabilitymodelforthewholejacketplatformisdescribedastherelationshipbetweentheloadandresistancebasedontheoffshoredesigncodes.Thereliabilityofwholeplatformiscalculatedbytheanalyticalmethodandtheimportancesamplingmethodonthebasisofacasestudyforatripodjacketplatform.