简介：Westudythegeneralrepresentationsofpositivepartialtranspose(PPT)statesinCKCMCN.ForthePPTstateswithrank-Nacanonicalformisobtained,fromwhichasufficientseparabilityconditionispresented.

简介：本文从分析双T网络虚地输出端着手，借助串／并联等效变换，给出双T网络的电压／电流相量图和阻抗图；引入对称化处理概念；界定了双T网络的实际输入阻抗；建立了完备的阻抗方程组，并做了按指定输入阻抗设计电路的示范。

简介：TheCprogramminglanguageisexpressiveandflexible,butnotsafe;asitsexpressivepowerandflexibilityareobtainedthroughunsafelanguagefeatures,andimproperuseofthesefeaturescanleadtoprogrambugswhosecausesarehardtoidentify.SinceCiswidelyused,anditisimpracticaltorewriteallexistingCprogramsinsafelanguages,sowaysmustbefoundtomakeCprogramssafe.ThispaperdealswiththeunsafefeaturesofCandpresentsasurveyonexistingsolutionstomakeCprogramssafe.Wehavestudiedbinary-levelinstrumentationtools,sourcecheckers,source-levelinstrumentationtoolsandsafedialectsofC,andpresentacomparisonofdifferentsolutions,summarizedthestrengthsandweaknessesofdifferentclassesofsolutions,andshowmeasuresthatcouldpossiblyimprovetheaccuracyoralleviatetheoverheadofexistingsolutions.

简介：Theone-dimensionalsuper-symmetricferromagnetict-JmodelisstudiedviathethermalBetheansatz.AnalyticexpressionsofthefreeenergyforT→Oareobtained.AnewcriticalbehaviourbeyondtheuniversalclassofLuttingerLiquidsisfoundinthissystem.

简介：ItisnotedthattheITER-FEATisanexperimentalreactorsystemwithaspectratioA=3whilethesphericalapproachhasaspectrationear1.4thatallowsformuchhigherstablebetavaluebuttheengineeringaspectsareratherformidable.Recently,

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简介：当用于含能材料的表面涂层时，ParyleneC涂层优良的电绝缘性能，使得涂层后的炸药表面容易产生静电积累，因此可能会降低炸药的静电安全性。通过试验初步考核了ParyleneC涂层后炸药的静电摩擦感度，并与未涂层炸药以及带聚氨酯复合涂层的炸药进行对比。实验简易装置如图1所示。

简介：本文介绍由三片集成块ＣＳ８２０４、ＷＥ９１４０Ａ、ＴＥＡ１０６１组成的典型电话机电路，主要分析电话机的电源供给电路、振铃电路、拨号电路和通话电路。

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简介：药柱传统的手动A型扫描探伤方法存在，检测过程的稳定性以及检测结果的准确性、可靠性较低，检测结果不够直观等不足之处。为了解决这些问题，对超声C-扫描成像检测技术的系统条件、技术参数、缺陷大小的系统标定等开展了研究，确定了炸药柱水浸式超声C-扫描成像检测条件，并对利用手动A型超探仪探伤有缺陷（包括分层类和疏松）的PBX-9003和TNT药柱进行了C-扫描成像检测。

简介：ThegrowinginterestintheuseofGalliumArsenidssemiconductormaterialshaspresentedmanyopportunitiesfordeviceoperationalspeedimprovementsbuthasalsopresentedmanyproblemsforthedevicemaker,Anoveldeep-submicronx-raylithographyprocessforT-shapedgatepatternsusefulforhigh-electron-mobilitytransistors(HEMT)isintroducedinthiswork.InthefabricationofT-shapedgateatherrlayerresistsmethodisused.Thex-rayexposureexperimentswerefinishedbyBeijingSynchrotronRadiationFacility(BSRF)3B1Abeamline,andgoodresulthasbeenobtained.

简介：介绍语音压缩处理C程序在美国德克萨斯仪器公司芯片为TMS320VC5410数字信号处理器(DSP)的实现方法

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简介：用常规的浸渍-还原法制备Pt／C催化剂，如果条件控制不好，制备出的Pt粒子大小和分散度不均，且易出现团聚。文中的主要目的是用微波密闭加热的方法，研究制备条件对Pt粒子大小的影响，制备高分散度且Pt粒径大小在一定范围内可控的Pt／C催化剂。

简介：Catalyticcombustionofpropane-airmixturewasinvestigated.Platinumcatalystsoveraflatstainlesssteelwithγ-aluminawashcoatwereemployed.Theemployedburnerhasthreecatalystssetparalleltothemixtureflow,spacedatanintervalof5,10and15mm.Bothexperimentandnumericalsimulationweremadeatinlettemperatureof553K,inletvelocityof3to7m/sandequivalenceratioof0.3to0.5.Inthenumericalsimulation,two-dimensional,steadystatemodelwasdevelopedtocalculatethetemperatureandspeciesconcentrationingas-phase.Inthismodel.chemicalreactiononthecatalystsurfaceandthatinthegasphasewereassumedtooccurinthree-steps.Thenumericalresultsshowgoodagreementwithexperimentalresults.Itwasfoundthatthepropertiesofthecatalyststronglyaffectthecatalystsurfacetemperature.Especially,thethermalconductivityofcatalysthasagreateffect,whiletheemissivityofcatalysthaslesseffect.

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简介：Thelittle-Higgsmodelstypicallycontainanewvector-liketopquarkT,whichplaysakeyroleinbreakingtheelectroweaksymmetry.InthecontextofthelittlestHiggs(LH)model,westudysingleproductionofthiskindofnewparticlesviatheprocessep→eb→veTinthefuturelinac-ring-typeepcollider(LCО×LHC).Wefindthattheproductioncrosssectionisintherangeof1.2×10^-40.48pbattheLCО×LHCwith√s=3.7TeV.

简介：用戴维南定理来推导T型网络—∏型网络的等效变换公式,思路清晰,过程简单,较适合于课堂教学时使用。

简介：在惯性约束聚变（ICF）研究中，激光烧蚀引起的瑞利-泰勒（R-T）不稳定性发展是一个重要的过程，对于燃料的均匀压缩、能量吸收率的提高等方面有很大的影响，因此必须进行仔细的研究。利用单色性、方向性、相干性均非常好的类镍银13．9am的X射线激光作为探针光源，采用阴影成像方法，可以对R-T不稳定性的发展进行空间分辨率很高（约1～2μm）的实验诊断，为相应的理论研究提供可供比对校验的实验样本。