AN INTERNATIONAL VIEW OF DIFFERENT APPROACHESFOR FAULTS DETECTION AND IDENTIFICATIONIN NUCLEAR POWER PLANTS

IntroductionSafe,reliable and economical operation is thegoal of any industrial process control system,particularly in nuclear power industry,wherecatastrophic events can have severe economic andsafety consequences and where even small degra-dation in plant performance can result in largereplacement power costs.After the TMI acci-dent in1 979,a large number of computer- baseddiagnostic systems have been proposed to sup-port nuclear power plant ( NPP) operators.Theearly diagnostic approaches …     

A SPEAKER ADAPTABLE VERY LOW BIT RATE SPEECHCODER BASED ON HMM

IntroductionPhonetic and segmentvocoders are popular tech-niques used in speech coding at rates on the or-der of 1 0 0 bit/s.These coders are based onrecognition/synthesis technique.They use somekind of speech recognition technique to decom-pose speech signals to sequence of speech units,such as phonetic units or speech segment units,and then transmit indexes and durations of therecognized units.The decoders receive this in-formation,and synthesize speech by concatenat-ing typical instances of…     

FUZZY METHOD FOR FAILURE CRITICALITY ANALYSIS

IntroductionFailure mode,effect and criticality analysis( FMECA) is a design methodology which putsforward preventive and corrective methods thatmay be taken to improve the reliability of prod-ucts through the analysis of the various potentialfailure modes of the different components of thesystem,their influence on the system and theseverity of their consequences in system design.FMECA is suitable for the study of the influenceof the failure of system components on the sys-tem and can be us…     

BLIND DIFFERENTIAL ADAPTIVE MULTIUSER DETECTION

IntroductionThe problem of combating multi- access interfer-ence ( MAI) in CDMA systems has receivedgreat attention recently[1～ 3] . In Ref. [4 ] ,M.Honig employed a blind adaptive multiuser de-tector based on the minimization of mean- out-put- energy( MOE) to overcome MAI,and itre-quired no more knowledge than did the conven-tional single- user receiver.Surplus energy wasemployed to suppress the effects of multi- accessinterference and thus provided an optimal detec-tion solution. The…     

论公路建设中暧和曲线的1∶1∶1设计

论述了公路建设中缓和曲线的１：１：１设计的方法,并进行了公式的推导,可操作性强。     

基于CFD的船舶形状因子随缩尺比及弗劳德数变化规律分析

针对实船阻力预报误差较大的问题,采用CFD软件Fluent分析某大型货船形状因子的变化规律,验证计算方法的准确性,采用叠模计算确定不同缩尺比及弗劳德数时船舶形状因子,结果表明,基于Flu-ent计算得到的船模阻力与模型试验结果基本吻合,计算方法准确;船舶形状因子(1+k)随缩尺比减小而增加,随弗劳德数增加而增加,主要是...     

城市轨道交通接驳常规公交服务评价体系研究

建设城市轨道交通与常规公交之间的快速接驳换乘体系,实现一体化公共交通是城市公共交通优先发展战略中不可或缺的部分.为有效评价常规公交和轨道交通接驳服务水平的高低,及时发现接驳系统中存在的短板,从设施、线网、运营和票价四个一体化方面选取了具有代表性的9个评价指标,构建了多层次结构的接驳服务评价指标体系,给出了各层次指标权重...     

某集装箱船实船与模型试验相关分析

本文对某集装箱船模型试验预报结果及5条姊妹船实船试航数据进行了相关分析。同一型船因为实际试航海况的差异，采用ISO15016:2015的方法进行修正后，得到的功率相关因子值有一定差异。这主要因该修正方法还是难以考虑到实际试航时各种复杂的气象、海况及水文条件。该方法虽存有一定的近似和不周之处，但其修正后的结果通常还是可以用于常规的航速预报，有一定的可信度，但与在标准试航条件下所测得的结果还是会有一定的差异。     

高职少学时《汽车零部件识图》课程的教学改革实践

<汽车零部件识图>课程课时的压缩,不能采用原有的教学方法.本文从激发学生兴趣,优化调整学习内容和采用现代化教学方法手段等方面,进行课程教学改革和实践,解决了该课程学时少与教学内容多的矛盾,取得较好的教学效果.     

共沉淀法制备Nd:YAG纳米粉体的反应机理研究

以A1(NO3)3·9H2O、Nd(NO3)3·6H2O、Y(NO3)3·6H2O和NH4HCO3为原料,采用共沉淀法制备出纯相的Nd:YAG纳米粉体。借助FT-IR、TG/DTA、XRD等测试手段对前驱体和Nd:YAG纳米粉体进行了表征,根据表征结果,推断了合成机理与成相机理。研究结果表明:合成过程中Y和Al元素按照3:5的比例均匀沉淀下来,形成包裹型结构的前驱体4[Al(OH)3]·6[Al(OH)CO3]·3[Y2(CO3)3·3H2O]·3.74H2O,煅烧时无定型的前驱体经由六方结构和钙钛矿结构的YAlO3(YAP),在1000℃直接转变为立方结构的Nd:YAG纳米粉体,晶粒大小20nm左右。