简介:摘要目的探究脑电地形图诊断脑血管疾病的临床治疗效果。方法选取我院2017年1月-2018年1月收治的64例脑血管病患者。将脑电地形图与同步脑电图、CT检查作对比分析。结果在脑血管病诊断中,BEAM阳性率(75%)高于同步EEG阳性率(51.7%),尤其TIA患者,发作过后EEG无阳性,而BEAM多数有异常改变;在脑血管病诊断中,BEAM阳性率略低于CT扫描阳性率,尤其脑出血早期,CT在所有病例均为阳性表现,明显高于BEAM阳性诊断率。TIA患者CT扫描均为阴性,BEAM多数为阳性。结论脑电地形图弥补了CT扫描单纯反应形态改变而无功能改变的不足,对脑血管疾病的诊断、预后有一定价值。
简介:监督分类法在遥感影像分类中应用广泛,结合已有地质资料和实测地质剖面信息,将研究区岩性分为苏维依组泥岩和粗砂岩,库姆格列木群泥岩、砾岩和含砾粗砂岩,巴什基奇克组粗砂岩和砾岩,巴西改组细砂岩等8个类型,运用ENVI提供的常用监督分类方法——最大似然法,对研究区的遥感影像进行岩性分类研究。并利用混淆矩阵分别对不同影像的分类结果进行精度评价,结果表明ZY-3影像的分类总体精度达到了78.65%,Kappa系数为0.7606,能够较好地进行岩性信息提取,具有较高的可靠性,可在地质调查工作中推广,能够有效地减少面积性地质测量工作,特别适用于岩石裸露程度较高的艰苦工作区。
简介:Thispaperconcernsthecalculationofthewavetroughexceedanceprobabilitiesinanonlinearsea.Thecalculationshavebeencarriedoutbyincorporatingasecondordernonlinearwavemodelintoanasymptoticmethod.Thisisanewapproachforthecalculationofthewavetroughexceedanceprobabilities,and,asallofthecalculationsareperformedintheprobabilitydomain,avoidstheneedforlongtime-domainsimulations.TheproposedasymptoticmethodhasbeenappliedtocalculatethewavetroughdepthexceedanceprobabilitiesofaseastatewiththesurfaceelevationdatameasuredatthecoastofYuraintheJapanSea.ItisdemonstratedthattheproposednewmethodcanofferbetterpredictionsthanthetheoreticalRayleighwavetroughdepthdistributionmodel.ThecalculatedresultsbyusingtheproposednewmethodhavebeenfurthercomparedwiththoseobtainedbyusingtheArhanandPlaistednonlineardistributionmodelandtheToffolietal.’swavetroughdepthdistributionmodel,anditsaccuracyhasbeenonceagainsubstantiated.Theresearchfindingsobtainedfromthisstudydemonstratethattheproposedasymptoticmethodcanbereadilyutilizedintheprocessofdesigningvariouskindsofoceanengineeringstructures.
简介:Sandblastingmachinesarewidelyusedinchemical,mechanicalandotherengineeringfields.Theinternalflowfieldofthesandblastingmachinebelongstoacomplexgas-solidtwo-phaseflow,andimpactbythecontinuousabrasivesandcancausethemachinetowearorevenfail.Inthisstudy,theEDEM-FLUENTcouplingmethodwasusedtocalculatethetransientflowfieldofthegasphaseandthemotion,dynamicandcollisioncharacteristicsofthesand.Airinthesandblastingmachinewastreatedastheidealgasandthecontinuousphase.Thesandwasregardedasthediscretephasesolidinthecomputation.UsingtheArchardwearmodel,thewearamountofthesandblastingmachinewascalculatedandthewearlawwasanalysed,toprovideatheoreticalbasisforoptimisingthedesignandoperationmethodoftheblastingmachine.
简介:Sandblastingmachinesarewidelyusedinchemical,mechanicalandotherengineeringfields.Theinternalflowfieldofthesandblastingmachinebelongstoacomplexgas-solidtwo-phaseflow,andimpactbythecontinuousabrasivesandcancausethemachinetowearorevenfail.Inthisstudy,theEDEM-FLUENTcouplingmethodwasusedtocalculatethetransientflowfieldofthegasphaseandthemotion,dynamicandcollisioncharacteristicsofthesand.Airinthesandblastingmachinewastreatedastheidealgasandthecontinuousphase.Thesandwasregardedasthediscretephasesolidinthecomputation.UsingtheArchardwearmodel,thewearamountofthesandblastingmachinewascalculatedandthewearlawwasanalysed,toprovideatheoreticalbasisforoptimisingthedesignandoperationmethodoftheblastingmachine.
简介:在MWC2018(世界移动大会)上海展上,中国联通研究院联合业界合作伙伴,包括华为、高通、联发科技、紫光展锐、Intel、三星、vivo、爱立信等联合发布了《4G+面向5G演进的终端及芯片技术白皮书》,旨在协同产业链各方就未来终端演进方向达成共识,牵引端、管、芯协同发展,从而加速4G+终端新技术落地商用,为5G的生态培育和商业模式探索打下坚实的基础。《4G+面向5G演进的终端及芯片技术白皮书》提出4G+终端面向5G演进的终端多个关键能力:4天线接收(4Rx)、支持TM9传输模式,载波聚合以及高阶调制等,指明了未来4G+终端技术演进的方向。这些关键能力可以为用户带来更高的速率体验,更低的业务时延,并能大幅提升网络容量,为满足5G时代业务需求奠定基础。
简介:Asthepaceofurbanizationisaccelerating,increasingamountoffloodplainhasbeenprojectedasthefuturecities.Subsequently,urbanfloodingisbeingstudiedbyglobalemergencymanagementexportsduetoitsincreasinglysignificantimpactonus.Someexistingresearchonfloodingemergencymanagementbasedonthecase-basedreasoning(CBR)methodhavemadetremendousprogress,buttheurbanfloodingcasewithitsstratifieddatacharacteristicsisrequiredanewmethodologywhichisdifferentfromtheonesappliedtoflashfloods.So,basedonthecase-basedreasoning(CBR)method,thispaperproposedaCPIE-CBRmodelwithfourlayers,classificationfiltration,punctiformsimilarity,intervalsimilarityandentropyweightmethod,tocalculatethecasesimilarityamongtheurbanfloodingcasewithstratifieddatacharacteristics.ThenwecarryoutthenumericalsimulationwiththerealdataaboutChinaandconductsomecomparisonwithoriginalwayssothatweobservethevalidityandefficiencyofourmodelintheend.
简介:摘要目的探讨护理干预对胃癌围手术期化疗的临床应用价值。方法随机选取从2016年11月到2017年11月我院收录治疗的胃癌确诊病例64例,随机分为干预组(32例)和对照组(32例),给与64例患者相同的常规护理,干预组分别在腹腔热灌注化疗前、化疗中和化疗后给与护理干预。记录两组患者腹腔化疗后的成功率、管道周围感染率和管道脱落率,同时记录腹腔热化疗失败原因、消化道等不良反应情况。结果干预组和对照组腹腔化疗成功率分别为100.00%、96.88%,干预组的管道周围感染率和管道脱落率都为3.13%,低于对照组的12.50%。结论护理干预可以减少进展期胃癌围手术期腹腔灌注化疗患者的腹腔化疗不良反应的发生,提高患者的耐受性和腹腔热化疗的效果,有很好的临床使用价值。
简介:摘要本文章简要讨论了在数学中有关圆的不遗漏、不重复的一些问题。通过典型例题与思维方法相结合,强调了师生不要忽视这种问题。