简介:'ThecommercialtestofthecatalystCS-12forethylbenzenedehydrogenationtostyrene'jointlyperformedbySINOPECShanghaiPetrochemicalResearchInstitute(SPRI)andSINOPECGuangzhouBranchCompany(GBC)hadrecentlypassedthetechnicalappraisalorganizedbySINOPECScienceandTechnologyDevelopmentDivision.
简介:摘要院针对传统的RBF神经网络在选取中心矢量参数时的不足,提出用具有较强跳出局部最优的布谷鸟算法(CS)优化RBF神经网络的中心矢量的改进算法,并将该算法应用于股票价格的预测,仿真结果表明该算法的预测精度比传统的RBF算法的预测精度高,是一种有效的股票预测方法。
简介:Sedimentationfromsoilerosionisacriticalreservoirwatershedmanagementissue.Duetothedifficultyoffieldinvestigations,empiricalformulasarecommonlyusedtoestimatethesoilerosionrate.However,theseestimationsareoftenfarfromaccurate.Aneffectivealternativetoestimatingsoilerosionistoanalyzethespatialvariationof137Csinventoryinthesoil.137Cscanbeadsorbedbythesoilandiswidelyassumedtochangeitsdistributiononlywhendisturbedbyrainfallandhumanactivities.Thus,137Csdistributedinsoilscanbeausefulenvironmentaltracertoestimatesoilerosion.Inthisstudy,thenetsoillossestimateis108,346t/yrandthegrosserosionandneterosionratesare10.1and9t/hayrrespectively.Thesedimentdeliveryratioisthereforeestimatedtobe0.9basedonthetwoerosionrates.Becauseofthesteephillsidesinthewatershed,only10%ofthesedimentyieldstayedinthedepositionsitesand90%wastransportedtotheriverasthesedimentoutput.Soilerosionestimatesfromspatialvariationsofthe137CsactivityintheBaishiriverwatershedshowedsatisfactoryaccuracywhencomparedtosedimentyielddata.Usingsoil137CsconcentrationsisthereforeafeasiblemethodforestimatingsoillossordepositioninTaiwan.Datasampling,analysisandresultofthisapproacharegiveninthispaper.
简介:摘要针对机械化驼峰JWXC-2.3型轨道电路模拟试验电路难点,设计制作驼峰轨道电路动态式模拟电路,解决以往JWXC-2.3型轨道电路模拟电路不稳定的问题,实现搭建的模拟电路安全稳定,电路原理简单、材料成本低等优点。
简介:线性调频连续波(LFMCW)与圆锥扫描(cs)相结合的雷达体制,可在获得目标高分辨距离像的同时分别测得各个散射中心的角度信息,从而有利于对距离扩展目标的检测和识别。文中给出了圆锥扫描线性调频连续波(CS-LFMCW)雷达信号的形式,研究了角度信息提取方法,详细分析了噪声、天线旋转不稳定、泄漏、弹体旋转等非理想因素对角度信息提取精度的影响,并提出了相应的解决方法。仿真结果验证了分析的有效性。圆锥扫描线性调频连续波雷达具有距离分辨率高、结构简单、体积小、重量轻、能够获取角度信息等优点,因此在近距离、末制导雷达中有着广泛的应用前景。