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1.
NomenclatureFelectromagneticforce(EMF)B(B0)magneticfluxdensity(MFD)IcurentintheliquidmetalEvoltageinthetwoendsoftheHaldeviceR...  相似文献   

2.
1IntroductionActivedevicesplayanimportantroleinmonolithicmicrowaveintegratedcircuits(MMICs).Formerly,thedepletionmodeGaAsMESF...  相似文献   

3.
MeasurementofMasDifusivityofMoistPorousMediaundertheInfluenceofForcedConvectionatSurfaceGuiKeting(归柯庭)HanJitian(韩吉田)ShiMingh...  相似文献   

4.
MIT的“制造业领导者(LFM)计划”郑大钟陈希MIT的“制造业领导者计划”(LeadersforManufacturingProgram,简称为LFM),在MIT众多的第二职业性学位计划(SecondProfessionalDegreeProgra...  相似文献   

5.
1IntroductionThelogicalstructureofaconverterfedmachine(CFM)systemissimplysketchedinFig.1.Tostudyorevaluatesuchasystemobviousl...  相似文献   

6.
Magnetic Fields in Disc-Type Permanent Magnet MachinesTX1IntroductionAtwo-dimensional(2D)analyticalmethodforcom-putingtheaxial...  相似文献   

7.
and Magnetic Properties in Fe_(25)Ni_(75) on Ball Milling TimeTX1IntroductionIthasbeenrecentlyreportedthatnanocrystalinemateri...  相似文献   

8.
SomeRemarksonStationaryThermistorProblemGuanPing(管平)(DepartmentofMathematicsandMechanics,SoutheastUniversity,Nanjing210018)F...  相似文献   

9.
AcousticEmissionMonitoringofFatigueCrackGrowthinaSlenderWebofBridgeGirderYanTinghu(颜廷虎)ZhongBinglin(钟秉林)(DepartmentofMechanic...  相似文献   

10.
AModifiedFeedforwardNeuralNetworkModelforFaultDiagnosisofRotatingMachineryZangChaoping(臧朝平)GaoWei(高)(NERCTV,SoutheastUnivers...  相似文献   

11.
本文对某市1978—1997年国内生产总值进行了形势分析并利用灰色预测理论对1999、2000年某市国内生产总值进行了预测.  相似文献   

12.
从蕴含和预设的角度对"差点儿"的客观意义和主观意义进行了分析,分析了"差点儿"的语义预设和语用预设,并从预设的角度解释了羡余否定现象的产生.通过和评注性副词的比较,指出"差点儿"是介于描摹性副词和评注性副词之间的一个副词.  相似文献   

13.
Five hundred eighty-seven women in a combined Maternity-Infant, Children and Youth project were interviewed at between 3 and 6 months of gestation by a skilled masters degree social worker (M.S.W.) using a Family Stress Checklist developed at the University of Colorado Health Sciences Center. Only 7% of the women were scored as “high risk” for serious parenting problems. Neither single status nor teenage status increased the risk significantly. A review of charts of 100 of the children whose mothers had been considered “at risk” was conducted 2 to 2.5 years later, and compared with 100 charts on children whose mothers had been considered at “no risk,” giving the following results: Twenty-five children had experienced failure to thrive, neglect or abuse. Twenty of these were from the original high risk mothers, giving an incidence of neglect/abuse in that group of 52%. The no risk control group of 100 mothers showed a 2% incidence of abuse/neglect; a low risk group showed a 4% incidence of abuse/neglect; and a mid-score group had an abuse/neglect rate of 5%. The scale proved a remarkably accurate predictor, with a sensitivity (percent correct negatives) of 89%. The authors suggest use of such scales prenatally or even before conception as a step toward the development of true preventive measures.  相似文献   

14.
校园人口密集,用水量大,对某一栋教学楼或某一区域的定量用水预测,对于发现用水异常、合理下达用水指标有实际意义.本文利用BP神经网络,结合校园用水的特点,建立校园用水预测模型,并以实际数据进行验证,证明其有效性.  相似文献   

15.
发展性阅读障碍亚类型的研究   总被引:2,自引:0,他引:2  
发展性阅读障碍是关系人类健康和发展的重要课题。多年来研究者试图寻找这个群体中发生困难的真正原因,希望从根本上解决阅读落后问题和消除阅读障碍。但是研究者发现阅读障碍群体内部具有很大的变异性。文章在简介了当今具有代表性的两种流派对阅读障碍原因的解释和相应的研究证据后,着重阐述了阅读障碍的亚类型的发展历史、研究者对亚类型的划分以及不同亚类型在语言技能上、一般感知能力和生理机制方面的差异,并且阐述了亚类型研究对阅读障碍早期预测的作用,为根本消除阅读障碍提供了新的视角。  相似文献   

16.
BP神经网络是应用最广泛的预测模型,它能方便、灵活地对信用卡消费行为进行探测,但BP网络有很多固有缺陷,比如结构难确定、初始权值选择盲目性导致训练速度慢等,结合信用卡交易数据的混沌特征分析,通过应用混沌理论中的相空间重构技术,把信用卡客户的相关数据嵌入到重构的相空间中,然后利用BP神经网络技术建立混沌风险探测模型,对信用卡交易行为进行风险预测.实验结果表明,该模型的预测精度高于一般的神经网络预测方法,其中正确检出率比使用BP神经网络模型提高了3%.  相似文献   

17.
文章应用几种不同时间序列预测方法对中小企业销售额进行建模并预测,旨在建立适用于中小企业的预测方法和预测模型,收集了某企业某产品2006~2012年各月销售额数据,利用时间序列中的回归模型、ARIMA模型对其进行拟合建模,并运用各模型对2013年前6个月的销售额进行了预测及比较分析,从中选出预测精度相对较高的模型。  相似文献   

18.
以奥运会奖牌数预测的实际问题为背景,结合灰色系统理论与马尔科夫预测的相关理论与方法,提出了一种新的奥运会奖牌数预测的灰色马尔科夫预测模型,从而为未来奥运会奖牌数预测提供了一种有效的方法。  相似文献   

19.
Based on the traditional theory of fracture, time-dependence of rock fracture is taken into account and the creep fracture criteria are given. The effect of the microcrack zone on fracture toughness is analyzed. Finally, a model for time prediction of rheological fracture is derived and its feasibility is proven. Supported by the National Natural Science Foundation of China (59809005) and the Science Foundation of Shanghai Municipal Commission of Science and Technology (96QF14009)  相似文献   

20.
1 Introduction Thedestructionofrockwasalwaysrelevanttothetimefactor,whichwastypicallymanifestedasthetimedependentgradualbreakingprocess.Thedominantfactorduringthedestructiveprocesswasextensionofmacrocracks,whichhadbeentestedoutbysitesurveyinThreeGorges…  相似文献   

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