简介：本文在0.0016％亚硝基R盐-0.75摩尔/升氯化铵,pH=9条件下,镍于-0.42伏(VS.S.C.E.)产生吸附催化波,波形好,镍浓度在0.01～0.6微克/毫升范围内有线性关系。常见的共存离子有一定的允许量,对一些镍矿石样品的分析结果与标准值无明显偏差。

简介：Traditionally,austeniticstainlesssteels304and316havebeenemployedincoastalregionsasroofingmaterialsunfortunately,theyareexpensiveandnotfullyresistanttopittingcorrosionunderseverecoastalcorrosiveenvironment.AferriticstainlesssteelB445Rwasdeveloped.Comparedwithaustenitic316L,B445Ris①lesscostly;②uperiorcorrosionresistantwithminormaintenanceforlong-termservice;③insusceptibletothermaldistortionintheweldingseam.B445Rsheetshowsahigheryieldstrengthandlowertensilestrength,lowerelongationandlowerwork-hardeningthanaustenitic316L.Itcanbeeasilyfabricatedanddeformedjustlikeplaincarbonsteel.Afterbending180o,thereisnooccurrenceof'cracking'ornoticeable'orangepeel'.Theformabilityoftheweldingseamisalsosatisfactory.ThepittingpotentialofB445Ris650mV,largerthanthatof304and316L,asshowninFig.1.ThecorrosionrateofB445Rsubmergedin6%FeCl,solutionis0.3-0.56g/(m2?h-1),muchlowerthanthatof316L,asshowninFig.2.ThesuperiorpittingcorrosionresistanceofB445RcanbeascribedtosynergeticeffectofhigherCrandMo.Dull-finishedB445RsheetshavebeenemployedastheroofingmaterialsforGuangzhouAsianGamesArena,asshowninFig.3.About380tof1.0mmB445Rwithdullfinishwasusedforroofingpanels.About100tof0.8mmB445Rwithhairlineorfluororesinpaintfinishwasusedforsidewallpanels.Thecompositeroofbuild-up（fromuptobottom）includes:①shinglesofferriticstainlesssteelB445R;②Kalzip-typestandingseamofaustenitic304;③water-proofDFM;④structuralsteel;⑤75mmthickinsulation;⑥secondarypurlinof150mm×100mm×4.5mmofgalvaniziedQ235;⑦0.8mmthickprofiledeckofgalvaniziedQ235;⑧acousticinsulation.Theroofingshinglesorpanelswiththesamewidthbutdifferentlengthwereformedbybendingfoursidesandfixedtoa'L'shapereinforcingframesofstainlesssteelbyfasteners.The'L'frameswasconnectedtoribsofthestandingseambyacl

简介：CDR300是可供现场使用的便携式专业CD录音机，具有以下特点：内置电容话筒、监听扬声器可兼容CD-R／RW可编程的线路均衡和滤波；独有的MinuteTrack录音模式；可兼容专业和民用光盘；限幅器和自动电平控制（ALC）；可创建和显示CD文本；2路XLR话筒输入；带48V幻象电源；便于携带；可在桌面上操作；尺寸279mm×102mm×229mm；重量3．2kg。

简介：ThepurposeofthispaperistoconstructanorthogonalArmletmulti-waveletswithmul-tiplicityranddilationfactora.Firstly,thedefinitionofArmletswithdilationfactoraisproposedinthispaper.BasedontheTwo-scaleSimilarTransform(TST),thenotionofthePara-unitaryA-scaleSimilarTransform(PAST)isintroduced,andwealsogivethetransformonthealltwo-scalematrixsymbolsofthemulti-waveletswithdilationa.ThenweshowthatthePASTandthetransformonthematrixsymbolsofthemulti-waveletskeeptheorthogonalityofthemulti-waveletssystem.Wediscusstheconditionthatmulti-waveletscorrespondingtothemulti-scalingfunctionsareallArmlets.AfterperformingthePASTandthetransformonthematrixsymbolsofthemulti-wavelets,themulti-scalingfunctioncanbebalancedandthecorrespondingmulti-waveletscanbeArmletsatthesametime.TheconstructionofArmletswithhighorderisalsodiscussed.Atlast,byagivenexample,wecanconcludethatthealgorithmisfeasibleandefficient.

简介：R&D人员投入对传统产业的优化升级具有重要意义,考虑到天津在R＆D人员投入方面存在的差距,天津应当以R＆D人员投入为切入点,加大人才引进力度,优化R&D人员投入结构和经费支出结构,以完成天津传统产业升级这一重要历史使命.

简介：摘要：随着ZPW2000R的轨道电路越来越广泛使用，列车不断提速，对移频轨道电路各项数值信息参数要求也越来越高，轨道电路中的各种干扰直接影响到列车的安全。目前，根据实际的工程例子，正在讨论在相邻的平行多线性轨道电路中解决干扰问题。邻近线路的信号干扰是机车，这是由于连接电容条、直径阻塞和其他原因之间电容电路的感应连接，邻近信号被侵入，因此机车感知到这种混合信号和邻近线路。

简介：摘要：如今有很多分析数据的软件，SAS，SPSS，Python，R，Origin等等，都是为了更加简单的处理、分析数据。我们在实验教学中主要用SAS和R。为了能够让学生加深对多种统计学方法的理解和应用，也为了让学生了解这两种软件，我们对教学中提到的每一种统计方法，都用这两种软件进行操作，对比其优缺点。本文中我们主要用到的统计学方法是主成分分析。

简介：AbstractPanax notoginseng is an ancient Chinese medicinal plant that has great clinical value in regulating cardiovascular disease in China. As a single component of panax notoginosides, notoginsenoside R1 (NGR1) belongs to the panaxatriol group. Many reports have demonstrated that NGR1 exerts multiple pharmacological effects in ischemic stroke, myocardial infarction, acute renal injury, and intestinal injury. Here, we outline the available reports on the pharmacological effects of NGR1 in ischemia-reperfusion (I/R) injury. We also discuss the chemistry, composition and molecular mechanism underlying the anti-I/R injury effects of NGR1. NGR1 had significant effects on reducing cerebral infarct size and neurological deficits in cerebral I/R injury, ameliorating the impaired mitochondrial morphology in myocardial I/R injury, decreasing kidney injury molecule-1 and neutrophil gelatinase-associated lipocalin in renal I/R injury and attenuating jejunal mucosal epithelium injury in intestinal I/R injury. The various organ anti-I/R injury effects of NGR1 are mainly through the suppression of oxidative stress, apoptosis, inflammation, endoplasmic reticulum stress and promotion of angiogenesis and neurogenesis. These findings provide a reference basis for future research of NGR1 on I/R injury.

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简介：故障现象1：不能转捷为AM波段接收MW、SW节目，FM波段接收正常

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简介：<正>BasedonsymboliccomputationsystemMapleandLyapunovstabilitytheory,anactivecontrolmethodisusedtoprojectivelysynchronizetwodifferentchaoticsystems—Lorenz-Chen-Lüsystem(LCL)andRsslersystem,whichbelongtodifferentdynamicsystems.Inthispaper,weachievegeneralizedprojectivesynchronizationbetweenthetwodifferentchaoticsystemsbydirectingthescalingfactorontothedesiredvaluearbitrarily.Toillustrateourresult,numericalsimulationsareusedtoperformtheprocessofthesynchronizationandsuccessfullyputtheorbitsofdrivesystem(LCL)andorbitsoftheresponsesystem(Rsslersystem)inthesameplotforunderstandingintuitively.

简介：S0nY新款的数字高清数字摄录一体机——HDW-F900R是以前24P多格式数字高清数字摄录一体机HDW-F900的升级型号。

简介：雷诺自创立之初,运动基因便贯穿其品牌.在雷诺运动技术部门里,有一群对高性能汽车心怀梦想的工程师,他们是雷诺运动梦想的实践者和缔造者.而作为检验汽车性能的终极试验场,纽北赛道的确很苛刻,复杂多变的弯道赋予它“绿色地狱”之称.而雷诺对运动的追求更为苛刻.2008年,雷诺梅甘娜R.S.创造了纽北前驱车最快圈速,证明了前驱车也可拥有媲美GT跑车的性能.

简介：20（R）—Rh2是一种次生甙,是红参的特有成分。日本学者研究发现,20（R）—Rhc是一种高活性的抗癌成分,具有独特的逆转作用,但由于红参中含量甚微,直接提取利用得不偿失,极大地限制了20（R）—Rh2的应用开发。吉林人参研究所陶丽华课题组的全体人员,经过八、九年的研究探索,又取得了新的成就。一九八七年他们采用人参地上部分以其中的二醇型人参皂甙为前体物质,利用化学转化方法进行化学结构的修饰改造,最终得到Rh2的纯品。经理化常数测定及13C谱检测,由沈阳药科大学徐绥绪教授确认为20（R）—Rh2。由此,为我国首次采用工业化方法生产人

简介：摘要随着城市轨道交通在大交通系统中重要性的日益增加，P+R停车换乘模式也被更加广泛的应用，这种交通模式鼓励人们通过换乘地铁出行或合乘出行，减少城市中心区车流量，缓解中心区内局部交通拥堵、节约能源和降低中心区空气污染。文章通过对西安北至机场城际轨道项目P+R换乘研究，分析该项目P+R的设置意义、功能及产生的社会效益和经济效益，同时也为陕西地区P+R的设置提供参考依据。

简介：本文详细分析了电压串联负反馈电路，在画基本放大器等效电路图时，反馈电阻ＲＦ的“负载效应”对输入的影响．通过实验分析、验证，告诉人们：ＲＦ在输入端的等效，应串入电容Ｃ６，可以提高这类实验的准确度

简介：TheHTScurrentleadsofsuperconductingmagnetsforlargescalefusiondevicesandhighenergyparticlecolliderscanreducethepowerconsumptionforcoolingby2/3comparedwithconventionalleads.Theresistivesectionsofhigh-ratedcurrentleadsareusuallymadeofaheatexchangercooledbygasflow.Thesupplyofthecoolingmassflowincursmorethan90%ofthecoolingcostfortheHTSleads.Themassflowraterequirementdependsnotonlyonthelengthandmaterialoftheresistiveheatexchanger,butalsoontheheattransfercoefficientandHEXsurface,thejointresistanceatthecoldendanditscoolingapproach.Thedesignandoperationofasheet-stackHEXwithalargerspecificsurfaceandamuchsmallerhydraulicdiameterarepresentedinthepaper.ThetestresultsofanHTSleadoptimizedfor8kAshowthata98.4%efficiencycanbeachieved.

简介：R-D1S是R—D1的改进版，大部分的配置都沿用R—D1的设计。依然采用了APSC尺寸（237mm×156mm）的610万有效像素原色CCD传感器，镜头倍率为1．5×。使用可以和莱卡M卡口兼容的VM卡口，通过转接器可以使用L卡口的镜头。但是后截距大于205mm的镜头，不能使用。

简介：摘要随着电力技术的不断发展，将电力资源作为一种清洁资源替代不可再生资源得到人们青睐。对于电力营销来说，如何识别潜在的优质客户，进行电能替代，实施精准营销正是行业内研究重点。本文介绍了一种基于R语言的大数据模型，从营销业务应用、用电信息采集系统抽取基础数据，按照“行业-领域-客户”三层数据分析架构，建立潜力客户识别模型，开展电能替代全过程管理应用。