简介：

简介：Variousagriculturalcropresiduesincludingcornstover,corncob,andsorghumstalkwithamoisturecontentof75wt%weresubjectedtoalongpretreatment(12-60h)withsupercriticalCO2(scCO2),atlowtemperature(50-80℃)andapressureof17.5-25.0Mpa.Thesugaryieldsfromtheenzymatichydrolysis(EH)ofthepretreatedsampleswereasmuchasthree-tofourfoldgreaterthanthoseaffordedbytherawmaterials.However,whenpretreatmentwasconductedwithinashorttime(e.g.0.5h),aspreviouslyreportedintheliterature,onlyaslightincreaseintheEHsugaryieldswasobserved.TheproposedscCO2pretreatmentmechanismdemonstratedtheroleofmoistureinthesystem.Wetting,softening,andswellingwereobservedtomainlyaffectthelignocellulosewhenasuitableamountofwaterwasadded.Finally,thesampleswereanalysedbyX-raydiffractionandscanningelectronmicroscopy,beforeandafterpretreatment,toinvestigatethechangesinthemicroscopicstructureofthebiomass.

简介：Anovelgas-phaseelectrocatalyticcellcontainingalow-temperatureprotonexchangemembrane(PEM)wasdevelopedtoelectrochemicallyconvertCO2intoorganiccompounds.TwodifferentCu-basedcathodecatalysts(CuandCu-C)werepreparedbyphysicalvapordepositionmethod(sputtering)andsubsequentlyemployedforthegas-phaseelectroreductionofCO2atdifferenttemperatures(70-90℃).ThepreparedelectrodesCuandCu-CwerecharacterizedbyX-raydiffraction(XRD),X-rayphotoemissionspectroscopy(XPS)andscanningelectronmicroscopy(SEM).Asrevealed,CuispartiallyoxidizedonthesurfaceofthesamplesandtheCuandCu-Ccathodiccatalystswerecomprisedofaporous,continuous,andhomogeneousfilmwithnanocrystallineCuwithagrainsizeof16and8nm,respectively.Theinfluenceoftheappliedcurrentandtemperatureontheelectro-catalyticactivityandselectivityofthesematerialswasinvestigated.Amongthetwoinvestigatedelectrodes,thepureCucatalystfilmshowedthehighestCO2specificelectrocatalyticreductionratesandhigherselectivitytomethanolformationcomparedtotheCu-Celectrode,whichwasattributedtothehigherparticlesizeoftheformerandlowerCuO/Curatio.Theobtainedresultsshowpotentialinterestforthepossibleuseofelectrical「enewableenergyforthetransformationofCO2intovaluableproductsusinglowmetalloadingCubasedelectrodes(0.5mgCucm2)preparedbysputtering.

简介：摘要对电力系统整体结构的保护措施而言，其中继电保护作为最关键的保护装置，不仅与电力系统的正常运行有着重要的关系，同时在预防故障问题方面也起着重要的作用。根据发展的需要，电力系统的规模不断地扩大，为电力负荷、电力设备的容量带来巨大的压力，同时也对继电保护装置的工作效率提出了更高的要求，因此需要加大对继电保护在日常运行中的监管力度，并针对存在的问题，完善管理策略，有效保障继电保护装置的安全、稳定运行，确保电力系统整体的工作效率与安全。

简介：Acompositebeamissymmetricifboththematerialpropertyandsupportaresymmetricwithrespecttothemiddlepoint.Inordertostudythefreevibrationperformanceofthesymmetriccompositebeamswithdifferentcomplexnonsmooth/discontinuousinterfaces,wedevelopanR(x)-orthonormaltheory,whereR(x)isanintegrableflexuralrigidityfunction.TheR(x)-orthonormalbasesinthelinearspaceofboundaryfunctionsareconstructed,ofwhichthesecond-orderderivativesoftheboundaryfunctionsareaskedtobeorthonormalwithrespecttotheweightfunctionR(x).WhenthevibrationmodesofthesymmetriccompositebeamareexpressedintermsoftheR(x)-orthonormalbaseswecanderiveaneigenvalueproblemendowedwithaspecialstructureofthecoefficientmatrixA:=[aij],aij=0ifi+jisodd.Basedonthespecialstructurewecanprovetwonewtheorems,whichindicatethatthecharacteristicequationofAcanbedecomposedintotheproductofthecharacteristicequationsoftwosub-matriceswithdimensionshalflower.Hence,wecansequentiallysolvethenaturalfrequenciesinclosed-formowingtothespecialtyofA.Weusethispowerfulnewtheorytoanalyzethefreevibrationperformanceandthevibrationmodesofsymmetriccompositebeamswiththreedifferentinterfaces.

简介：A60%Fe/Al2O3catalystwaspreparedbytheco-precipitationmethod.ItwasreducedbyH2toproducemetallicFe,whichwasthensulfidedbyCS2toFe0.96SandFe3S4orphosphidedbytriphenylphosphine(PPh3)inliquidphasestoFe2PandFeP.Itwasfoundthattheironsulfides(Fe0.96SandFe3S4)exhibitedthelowactivityforthehydrodesulfurization(HDS)reactions.TheHDSactivitywasalsolowontheFe(metal)/Al2O3andFe2P/Al2O3catalystssincetheywereconvertedintoFe0.96SandFe3S4duringtheHDSreactions.Incontrast,theFeP/Al2O3wasfoundtobestableandactivefortheHDSreactions.Inparticular,FeP/Al2O3possessedsignificantlysmallerFePparticlesthanFeP/C,leadingtothesignificanthigherHDSactivityofFeP/Al2O3thanFeP/C.

简介：用微波高温固相法合成了Er^3+单掺Lu2O3,Li^+与Er^3+共掺Lu2O3及Li^+,Zn^2+,Mg^2+掺杂Lu2O3∶Er^3+的荧光粉。实验表明金属离子Li^+、Zn^2+、Mg^2+、Er^3+掺杂Lu2O3,不影响Lu2O3的立方晶相。扫描电子显微镜测量表明,Li^+掺杂可以有效改善粉体的分散性和形貌,Li^+,Zn^2+,Mg^2+共掺杂获得的粉体颗粒分布更加均匀,粒径范围为80~100nm。379nm激发下,Li^+与Er^3+共掺样品发光较单掺Er^3+样品在565nm处的发光增强了4.5倍,而Li^+、Zn^2+、Mg^2+与Er^3+共掺样品较其发光增强5.3倍。980nm激发下,Li^+与Er^3+共掺样品,Li^+、Zn^2+、Mg^2+与Er^3+共掺样品的发光分别比单掺Er^3+样品在565nm处发光增强23倍与39倍,在662nm处发光强度分别增强20倍与43倍。379nm激发下,较单掺Er3+的样品,掺杂Li^+的样品和Li^+,Zn^2+,Mg^2+和Er^3+共掺的样品荧光寿命均有所增加,而Zn^2+、Er^3+共掺及Mg^2+、Er^3+共掺样品的荧光寿命则有所缩短。

简介：Thenotionofmultibandsuperconductivitywithdominanttwo-gapfeatureshasbeenrecentlyappliedtotheunconventionalsuperconductorCeCu2Si2forchallengingthepreviouslyacceptedconceptofnodald-wavepairing.Intheproposedstudy,therealisticmultibandFermisurfacetopologyofCeCu2Si2wasobtainedthroughfirst-principlescalculations,andanalysiswasconductedwithaneffectivetwo-bandhybridizationmodelincludingdetailedbandstructure.WithintheT-matrixapproximation,theobtainedcalculationresultsshowthatdifferentpairingcandidates,includingfullygappeds-wave,loop-nodals-wave,andd-wavepairings,couldyieldqualitativelydistinctfeaturescharacterizedbyimpurity-inducedboundstates.Thesefeaturescanbeverifiedthroughhigh-resolutionscanningtunnelingmicroscopyorspectroscopyandprovidecorroborativejustificationthatwouldbebeneficialfortheongoingresearchregardingthesuperconductinggapsymmetryofCeCu2Si2atambientpressure.

简介：利用2-羟甲基吡啶(Hhmp)、三乙胺和Mn(CH3COO)2在室温下反应,合成了2D分子基磁性配位聚合物[Mn3Ⅱ(CH3COO)6(H2O)4·(H2O)2]n,其结晶为单斜空间群P21/c.在标题化合物中,Mn2+通过乙酸根离子连接形成线性三核Mn3(CH3COO)6单元;这些单元进一步通过乙酸根离子连接形成1个具有4-连接节点的二维层状44拓扑结构;最后,层与层之间通过氢键连接形成3D超分子网络结构.磁性研究表明,由于缺少反转中心,标题化合物在低温时表现出自旋倾斜反铁磁有序,这在纯乙酸基团构筑的体系中比较少见.

简介：WehavesynthesizedandinvestigatedphysicalpropertiesoftwonewquaternarycompoundsGd2CoAl4T2(T=Si,Ge)singlecrystals,whichareisostructuraltoTb2NiAl4Ge2andEr2CoAl4Ge2.Themostimportantstructuralfeatureofthesematerialsistheanti-CaF2-typeCoAl4T2slabs.Thesematerialsshowmetallicbehaviorbelow300Kandthereisalong-rangeantiferromagnetic(AFM)transitionappearingat20and27KforGdCoAl4Ge2andGd2CoAl4Si2,respectively.ResistivityandheatcapacitymeasurementsalsoconfirmthesebulkAFMtransitions.Furtheranalysisindicatesthatthislong-rangeantiferromagnetismshouldresultfromthemagneticinteractionbetweenlocalmomentsofGd^3+ions.

简介：摘要近年来，我国的电力行业有了很大进展，电力系统发展迅速。本文首先分析电气自动化控制技术发展现状及其在电力系统建设过程中应用该技术的重要价值，然后以此为基础，综合探究在电力系统建设过程中电气自动化控制技术的具体应用，最后，进一步分析自动化技术未来发展方向，希望能够为其相关工作人员具体作业提供更为丰富的理论依据。

简介：Inthispaper,carbonmicrospherepreparedbyhydrothermaltreatmentwasactivatedbyKHCO3athightemperature,andemployedasthecatalystforVO2+/VO2+redoxreactionforvanadiumredoxflowbattery(VRFB).CarbonmicrospherecanbeetchedbyKHCO3duetothereactionbetweenthepyrolysisproductsofKHCO3andcarbonatoms.Moreover,KHCO3activationcanbringmanyoxygenfunctionalgroupsoncarbonmicrosphere,furtherimprovingthewettabilityofcatalystandincreasingtheactivesites.Theelectrocatalyticpropertiesofcarbonmicrospherefromhydrothermaltreatmentareimprovedbyhightemperaturecarbonization,andcanfurtherbeenhancedbyKHCO3activation.Amongcarbonmicrospheresamples,theVO2+/VO2+redoxreactionexhibitsthehighestelectrochemicalkineticsonKHCO3activatedsample.ThecellusingKHCO3activatedcarbonmicrosphereasthepositivecatalystdemonstrateshigherenergyefficiencyandlargerdischargecapacity,especiallyathighcurrentdensity.TheresultsrevealthatKHCO3activatedcarbonmicrosphereisanefficient,low-costcarbon-basedcatalystforVO2+/VO2+redoxreactionforVRFBsystem.

简介：WehavecomprehensivelyinvestigatedthefrustratedJ1-J2-J3Heisenbergmodelonasimplecubiclattice.Thismodelallowsthreeregimesofmagneticorder,viz.,(π;π;π),(0;π;π)and(0;0;π),denotedasAF1,AF2,andAF3,respectively.Theeffectsoftheinterplayofneighboringcouplingsonthemodelarestudiedintheentiretemperaturerange.Thezerotemperaturemagneticpropertiesofthismodelarediscussedutilizingthelinearspinwave(LSW)theory,nonlinearspinwave(NLSW)theory,andGreen’sfunction(GF)method.ThezerotemperaturephasediagramsevaluatedbytheLSWandNLSWmethodsareillustrated,andareobservedtoexhibitdifferentparameterboundaries.Incertainregionsandalongtheparameterboundaries,thepossiblephasetransformationsdrivenbytheparametersarediscussed.TheresultsobtainedusingtheLSW,NLSW,andGFmethodsarecomparedwiththoseobtainedusingtheseriesexpansion(SE)method,andareobservedtobeingoodagreementwhenthevalueofJ2isnotclosetotheparameterboundaries.ThegroundstateenergiesobtainedusingtheLSWandNLSWmethodsareclosetothatobtainedusingtheSEmethod.Atfinitetemperatures,onlytheGFmethodisemployedtoevaluatethemagneticproperties,andthecalculatedphasediagramisobservedtobeidenticaltotheclassicalphasediagram.Theresultsindicatethatattheparameterboundaries,atemperature-drivenfirst-orderphasetransitionbetweenAF1andAF2mayoccuralongtheboundaryline.AlongtheAF1-AF3andAF2-AF3boundarylines,AF3islessstablethanAF1andAF2.OurcalculatedcriticaltemperatureagreeswiththatobtainedusingMonteCarlosimulationsandpseudofermionfunctionalrenormalizationgroupscheme.

简介：摘要近年来，我国在公路工程建设上取得的成绩足以让人自豪，伴随工程项目的不断增加，合同作为建设过程中联系各参与方的纽带，逐渐成为工程管理的重要管理内容，并受到越来越多人的重视。本文在对公路工程合同管理中存在问题进行简要分析的基础上，从合同文本拟定审查、加强合同风险意识、严格执行合同细则、建立健全组织机构等方面分析阐述合同管理措施，希望有助于提高合同管理的科学性与有效性。

简介：摘要配电工程作为电力工程中的重要环节，其质量直接影响着电力企业的供电质量，需要对配电工程的施工质量进行严格的控制与监督，才能确保电力企业的供电系统能够稳定运行。本文从配电工程施工的安全、管理，以及工程施工的各个阶段逐一展开，详细介绍了配电工程施工的质量控制措施，以期形成系统的质量控制策略，科学、合理指导今后的工作开展，进一步提供更加高质量的供电。

简介：摘要为了保护生态环境，减少污染的排放，国家政府颁布了关于电能替代的一系列政策，要求实现“以电代煤、以电代油、电从远方来”的发展目标。为了响应国家政策，各地电力公司展开了一系列的改革，对企业内部不断的进行优化，在营销系统的具体流程方面逐渐进行完善，清楚的划分工作内容以及各项工作的责任和义务，在各个项目的管理标准方面逐渐进行规范，与此同时，对企业内部的员工积极进行培训，建立相关考核机制，在风险方面也逐渐加大了监督和控制，让电能替代能够与营销传统业务进行全面的融合，充分提升电力公司的管理水平，就目前而言这种方式不仅获得了广大客户的认可，在市场方面也取得了良好的效果。本文主要对电能替代与营销传统业务深度融合的实践做简要分析。

简介：摘要为提高电厂电气设备检修水平，分析了电厂电气设备检修工作现存主要隐患，并结合实际工作经验提出一些针对性的管理建议，通过对电厂电气设备的及时检修与科学管理，可更好地保障电厂电气设备的安全、稳定运行。

简介：Thenextgenerationofadvancedlightsourcesrequiresphotonswithlargeaveragefluxandhighbrightness,whichneedsadvancedelectrongunmatchedwithexcellentphotocathodematerials.K2CsSbphotocathodehastheadvantagesofhighquantumefficiency,longlifetimeandinstantaneousresponse.ThisstudyintroducesthedesignofasetofK2CsSbphotocathodepreparationsystemsanddetailedpreparationprocessofK2CsSbphotocathodes,includingsequentialdepositionprocessandco-depositionprocess,andfinallydevelopsaK2CsSbphotocathode.Theinfluenceoflaserpoweronthequantumefficiencyisalsoinvestigated.

简介：Thedevelopmentofthehydrogenelectrodeisvitalfortheapplicationofalkalinepolymerelectrolytefuelcells(APEFCs).Inthisstudy,aseriesofNi(OH)2decoratedNi/Ccatalysts(Ni(OH)2-Ni/C)werepreparedbyathree-stepelectrochemicaltreatmentofNi/C.TheexistenceofNi(OH)2wasdemonstratedbyX-rayphotoelectronspectroscopy(XPS),andthesurfacemolarratioofNi(OH)2/Niofthesampleswasestimatedviaanelectrochemicalmethod.TheHORcatalyticactivityofthecatalystswasevaluatedbyarotationdiskelectrode(RDE)method,anda'volcanoplot'wasestablishedbetweentheHORexchangecurrent(j0)andthesurfacemolarratioofNi(OH)2/Ni.Ontopofthe'volcano',thesurfacemolarratioofNi(OH)2/Niis1.1:1,thej0ofwhichwas6.8timesofthatofNi/C.ThestabilityofthesamplestowardHORwasevaluatedtobegood.OurstudyaddedasystematicexperimentalevidencetotheHORresearch,showingthattheHORcatalyticactivityofNicanbedeliberatelycontrolledviadecorationofNi(OH)2,whichmayhelpunderstandingtheHORmechanismonNi.

简介：摘要电力业扩报装的效率直接影响电力企业的服务与管控水准。笔者在本文中对左右电力业扩报装速度的元素实施解析，并对相关电力业扩报装速度的解决方案实施详尽的阐述。综上所述，业扩报装属于电力销售板块，所以增加电力销售所带来的经济收益，必须加速业扩报装速率，解析业扩报装速率的影响元素并给出对应的策略来对其实施管控