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简介：Toeffectivelysolvetheagglomerationproblemsinthesolidstatereactionprocess,pre-addingglucoseisadoptedtothesynthesisofLiFePO4/CenergymaterialsusingFe–Pwasteslag.Theaverageparticle&grainsizeofLiFePO4/Cdecreases,andtheimpuritiesinLiFePO4/Ccompositesreducetoagreatextent.Itmakesgreatsensetothemassindustrialproduction.Theoptimumsynthesisconditionsdeterminedinthisworkarebasedontheorthogonalexperiments.Thesamplessynthesizedinascaleof500gexhibithighpurity,excellentelectrochemicalperformance,highreactionactivity,goodreversibility,andlowpolarizationlevel.Thedischargecapacitiesare145,134,117,and102mAh/gatthecurrentdensitiesof0.1C,0.2C,0.5Cand1C,respectively.ThisworkputsforwardapracticalsuggestionformassproducingenvironmentalbenignandlowcostLiFePO4/Cascathodematerialsoflithiumionbatteries.

简介：证明了(C-K)性质,(S-K)性质,L-KR空间,L-KS空间和CL-KR空间和CL-KS空间的一些充要条件.这些条件表明了(C-K)与(S-K)性质,L-KR与L-KS空间及CL-KR空间与CL-KS空间之间的对偶性质.

简介：给出了C^n单位球上的Bloch空间上的复合算子的下有界的一个充分条件和一个必要条件。对必要条件得出了较优的结论．

简介：通过在谐振腔内插入窄带滤光片,开展了XeF（C-A）蓝绿激光窄线宽输出实验研究。研究结果表明,采用该方法,可以获得焦耳量级能量、线宽小于2nm、波长稳定的激光输出,激光最窄线宽为1.3nm。增大滤光片与谐振腔光轴的入射角,激光器输出能量降低。

简介：AfacilehydrothermalmethodwasdevelopedforthepreparationofFe2O3@CnanocompositesusingFeCl3·6H2Oasironsourceandglucoseascarbonsourceunderalkalinecondition.Themorphologyandstructureoftheas-preparedproductwereidentifiedbytransmissionelectronmicroscopy(TEM),highresolutiontransmissionelectronmicroscopy(HRTEM),field-emissionscanningelectronmicroscopy(FESEM),X-raydiffraction(XRD),Ramanspectroscopy,FourierTransforminfraredspectroscopy(FTIR),andthermogravimetricanalysis(TGA).Theas-prepareα-Fe2O3@Cnanocompositeswereemployedforsupercapacitorelectrodematerial.Thesynergisticcombinationofcarbonelectricaldouble-layercapacitanceandα-Fe2O3pseudo-capacitanceestablishedsuchnanocompositesasversatileplatformforhighperformancesupercapacitors.Thesynthesismethoddevelopedhereisexpectedtoobtainothermetaloxide/carboncomposite.

简介：使用一种唯象的ＮＮ周边模型湮灭势，对１８０Ｍｅｖ的Ｐ－１２Ｃ弹性散射微分截面、极化角分布和自旋旋转参数进行了计算。结果表明，这种势模型与实验符合得较好。更多还原

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简介：若无限长均匀带电直导线（线电荷）与接地平板系统的电场是二维静电场,当求解区域可视为为多边形时,则可应用S-C映射法和电像法为统一模型,求解出线电荷在求解区域所激发的电势。

简介：为了满足我国正在建设的白光中子源（whiteneutronsource,WNS）需求,设计了具有共性化架构的C6D6谱仪读出电子学系统。该系统基于波形数字化技术和PXIe平台,实现对γ能谱和中子飞行时间的测量。介绍了系统设计方案,详细阐述了信号调理模块、时间测量、PXIe平台及相关软件的设计与实现,并开展了系统性能测试和联调实验。测量结果表明：该系统能够正确获得测量数据,满足了白光中子源的首批实验需求。

简介：Cu-Fecompositeoxideswerepreparedbyco-precipitationmethodandtestedforhigheralcoholsynthesisfromsyngas.TheselectivitytoC2+OHandC6+OHinalcoholdistributionwasveryhighwhilethemethaneproductfractioninhydrocarbondistributionwasratherlow,demonstratingapromisingpotentialinhigheralcoholssynthesisfromsyngas.ThedistributionofalcoholsandhydrocarbonsapproximatelyobeyedAnderson-Schulz-Florydistributionwithsimilarchaingrowthprobability,indicatingalcoholsandhydrocarbonsderivedfromthesameintermediates.TheeffectsofCu/Femolarratio,reactiontemperatureandgashourlyspacevelocity(GHSV)oncatalyticperformancewerestudiedindetail.ThesamplewithaCu/Femolarratioof10/1exhibitedthebestcatalyticperformance.Higherreactiontemperatureacceleratedwater-gas-shiftreactionandledtolowertotalalcoholsselectivity.GHSVshowedgreateffectoncatalyticperformanceandhigherGHSVincreasedthetotalalcoholselectivity,indicatingthereexistedvisibledehydrationreactionofalcoholintohydrocarbon.

简介：Theroleofpulseparametersonnanoparticlepropertyisinvestigatedself-consistentlybasedonacoupleoffluidmodelandaerosoldynamicsmodelinacapacitivelycoupledparallel-plateacetylene(C2H2)discharge.Inthismodel,themasscontinuityequation,momentumbalanceequation,andenergybalanceequationforneutralgasaretakenintoaccount.Thus,thethermophoreticforceariseswhenagastemperaturegradientexists.Thetypicalresultsofthismodelarepositiveandnegativeiondensities,electronimpactcollisionsrates,nanoparticledensity,andchargedistributions.Thesimulationisperformedfordutyratio0.4/0.7/1.0,aswellaspulsemodulationfrequencyfrom40kHzto2.7MHzforpureC2H2dischargesatapressureof500mTorr.Wefindthatthepulseparameters,especiallythedutyratio,haveagreataffectonthedissociativeattachmentcoefficientandthenegativedensity.Moreimportantly,bydecreasingthedutyratio,nanoparticlesstarttodiffusetothewall.Undertheactionofgasflow,nanoparticledensitypeakiscreatedinfrontofthepulseelectrode,wherethegastemperatureissmaller.

简介：PolysaccharidecoatedPLAnanoparticlesbearingaldehydegroupswerepreparedbydialysisofDMSOsolutionofcholesterolhydrophobic-modifieddextranpolyaldehydeandPLAagainstwater.Theaveragediameterofthenanoparticleswasabout160nm,andthesizedistributionwasnearlyhomogenous.ThenanoparticleswerefunctionalizedsimultaneouslywithCD71andEGFRantibodythroughtheSchiff'sbasereaction,andthenradiolabeledwith~(99m)Tc.Afterperfusedtheradiolabelednanoparticlesintotumor-bearing...

简介：Amodelstudyleadingtothepreparationoftheuniquetricyclo[6.2.1.0]undecaneBCDringsystemsofaconitineisdescribed.Thesynthesisfeaturesanunprecedenteddiastereoselectiveoxidativedearomatization/dimerization/retro-DA/IMDAcascadereactionandahighlyefficientWagner-Meerweinrearrangement.

简介：双音多频DTMF(DualToneMulti—Frequency)信号是音频电话中的拔号信号，将DTMF信号的检测集成到含有数字信号处理器(DSP)的系统中，是一项较有价值的实际课题．本文给出在TI公司浮点DSP芯片C6711中的实现方案，通过20个并行的哥兹柔信号滤波器成成功地使双音多频信号检测变得准确、迅速和简单。

简介：ＹｉｅｌｄｏｆＴｒａｎｓｔａｒｇｅｔＰｒｏｄｕｃｔｓｆｒｏｍＩｎｔｅｒａｃｔｉｏｎｏｆ４７ＭｅＶ／ｕ１２ＣＩｏｎｓｗｉｔｈＣｓＴａｒｇｅｔｓ￥ＬｉＺｏｎｇｗｅｉ；ＹａｎｇＷｅｉｆａｎ；ＺｈａｏＺｈｉｚｈｅｎｇａｎｄＭｕＷ?..

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简介：Tomeettherequirementsofelectronicvehicles(EVs)andhybridelectricvehicles(HEVs),thehighenergydensityLiNi0.8Co0.15Al0.05O2(NCA)cathodeandSi–Canodehaveattractedmoreattention.HerewereportthethermalbehaviorsofNCA/Si–Cpouchcellduringthecharge/dischargeprocessesatdifferentcurrentdensities.ThetotalheatgenerationsarederivedfromthesurfacetemperaturechangeduringelectrochemicalLi+insertion/extractioninadiabaticsurrounding.Thereversibleheatisdeterminedbytheentropiccoefficients,whicharerelatedwithopen-circuitvoltageatdifferenttemperatures;whiletheirreversibleheatisdeterminedbytheinternalresistance,whichcanbeobtainedviaV–Icharacteristic,electrochemicalimpedancespectroscopyandhybridpulsepowercharacterization(HPPC).Duringtheelectrochemicalprocess,thereversibleheatcontributeslessthan10%tototalheatgeneration;andtheheatgeneratedinchargeprocessislessthanthatindischargeprocess.Theresultsofthermalbehaviorsanalysesareconducivetounderstandingthesafetymanagementandpavingthewayforbuildingareliablethermalmodelofhighenergydensitylithiumionbattery.

简介：漓江近30年来出现了水量减少、枯水期越来越长的问题,而其上游青狮潭水源林覆盖的变化是影响漓江水量的重要因素之一。分别利用遥感比值植被指数(RVI)和归一化植被指数(NDVI)模型,提取美国ETM遥感图像青狮潭水源林不同时相的植被指数,通过分析植被指数的变化来研究水源林覆盖的变化。结果表明,1999年12月15日至2002年1月5日,研究区青狮潭水源林大部分面积(约80%)的植被覆盖度出现下降趋势,但植被覆盖度减少的数值不大,RVI减少值主要在-1.5≤·RVI<-0.1,NDVI减少面积中超过一半面积的NDVI减少值在-0.2≤·NDVI<-0.1,增长、不变的面积各占10%左右,遥感植被指数为定量分析漓江上游水源林覆盖的变化提供了一种有效手段。

简介：综述介绍了近5年来过渡金属催化下异腈参与的多组分反应的研究进展.