简介：Acleanmethodforpreparinglayereddoublehydroxides(LDHs)hasbeendeveloped,featuredbyusingthehydroxidesoftwodifferentmetalsasstartingmaterialsbyatom-economicreactions.Thereactionswerecarriedoutunderhydrothermalconditionsineitherahighpressureautoclaveoramicrowavedigester.Thecompositions,structuralparametersandthermalbehavioroftheresultingLDHsareverysimilartothoseofmaterialsproducedbyusingtheseparatenucleationandagingsteps(SNAS)method.Themajoradvantageofthenewmethodisthatnoby-productisproduced,sothatfiltrationandwashingprocessesareunnecessary.Theconsequentreductioninwaterconsumptionisbeneficialtotheenvironment.

简介：Athree-dimensionalmodelofGaAs/A1GaAsquantumdoubleringsinthelateralstaticelectricfieldisinvestigatedtheoretically.Theeigenvalueproblemwiththeeffective-massapproximationissolvedbymeansofthefinite-elementmethod.Theenergylevelsandwavefunctionsofquantum-confinedelectronsandheavyholesareobtainedandshowanagreementwithourprevioustheoreticalandexperimentalstudies.ItisshownintheapproximationofneglectingtheCoulombattractionbetweentheelectronandheavyholethatarelativelylargeStarkshiftofexcitonemissionof4meVisattainablewithanappliedelectricfieldof0.7kV/cm.

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简介：反响的双Hopf分叉的最简单的正常形式基于谎言操作员被学习。反响的双Hopfbifurcation和以原来的系统，系数明确地被给的非线性的转变的最简单的正常形式的系数。非线性的转变被用于减少lower-ordernormal和higher-ordernormal形式，并且系统矩阵的等级被用来决定能被减少的正常形式的系数。这些使获得的正常形式比传统的简单。Ageneral节目与Mathematica被编译。这个程序能计算反响的双Hopf分叉的最简单的正常形式和非反响的形式直到第7顺序。

简介：Vortexbeamswithfractionaltopologicalcharge(FTC)havemanyspecialcharacteristicsandnovelapplications.However,oneoftheobstaclesfortheirapplicationisthedifficultyofpreciselydeterminingtheFTCoffractionalvortexbeams.WefindthatwhenavortexbeamwithanFTCilluminatesadynamicangulardoubleslit(ADS),thefar-fieldinterferencepatternsthatincludetheinformationoftheFTCofthebeamattheangularbisectordirectionoftheADSvaryperiodically.Basedonthisproperty,asimpledynamicADSdeviceanddatafittingmethodcanbeusedtopreciselymeasuretheFTCofavortexlightbeamwithanerroroflessthan5%.

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简介：BACKGROUND:Withdevelopmentsoftissueengineeringandgeneticengineering,weaimtoculturemyoblasts,whicharecharacterizedbyhighpurity,highqualityandhighproduction,forwideapplicationinneuralregenerationresearches.OBJECTIVE:Tomodifytraditionaldissociationmethodinordertoobtainmyoblasts,whicharecharacterizedbyhighpurity,highqualityandhighproduction,andexplorethebiologicalpropertiesunderinvitroculture.DESIGN:Observationalstudy.SETTING:BasicInstituteofAcademyofMilitaryMedicalSciencesofChinesePLA.MATERIALS:FourneonatalWistarratsof5daysold,bothgendersandmeanbodymassof10gwereselectedinthisstudy.Themainreagentsanddevicesweredetailedasfollows:DMEMmedium(GibcoCompany),fetusbovineserum(FBS,HycolneCompany),collagenaseⅡ(SigmaCompany),trypsin(SigmaCompany),dispaseⅡ(SigmaCompany),desminantibody(FuzhouMaixinCompany),antibodyⅡandABCkit(WuhanBosterBiotechnologyCompany),deskcentrifuge(KUBATO,Japan),andinvertedphasecontrastmicroscope(LEICADMIRB,Germany).METHODS:TheexperimentwascarriedoutintheBasicInstituteofAcademyofMilitaryMedicalSciencesofChinesePLAfromJunetoOctober2006.Neonatalratsweresacrificedundersterileconditiontoobtainskeletalmusclesoflimbs,whichwerewashedwithcoldPBS(containingbenzylpenicillinandestreptomicina),andmusculartissuewasshearedintopieces.Then,thosemuscularpieceswereaddedwithmixeddigestiveenzyme(containing2g/LcollagenaseⅡ+5g/LdispaseⅡ+0.28g/LCaCl2)astwicevolumeaspieces,dealtwithmechanicalpipettingfor5minutesandculturedinCO2incubatorfor10minutes.Theoperationwasdoneforthreetimesandthemuscularpiecesweredigestedfor45minutesintotal.Moreover,cellsweresuspendedagaininordertoobtainmyoblastsfromskeletalmuscleofneonatalrats.Inaddition,myoblastswerepurifiedwithdifferentialattachmenttechniqueandenzymedigestionsoastoobservemorpho

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简介：Usingfoursatellitedatasets(TOMS/SBUV,OMI,MLS,andHALOE),weanalyzetheseasonalvariationsofthetotalcolumnozone(TCO)anditszonaldeviation(TCO*),andrevealtheverticalstructureoftheOzoneLow(OV)overtheAsiancontinent.Ourprincipalfindingsare:(1)TheTCOovertheAsiancontinentreachesitsmaximuminthespringanditsminimumintheautumn.TheOzoneLowexistsfromMaytoSeptember.(2)TheOzoneLowhastwonegativecores,locatedinthelowerandtheupperstratosphere.Thelowercoreisnear30hPainthewinterand70hPaintheotherseasons.Theuppercorevariesfrom10hPato1hPaamongthefourseasons.(3)ThepositionoftheOzoneLowinthelowerandtheupperstratosphereovertheAsiancontinentshowsseasonalvariability.

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简介：Zr和它的合金作为新结构的材料有优秀机械性质，但是在特定的申请环境，它的腐蚀抵抗仍然需要进一步被探索。在这个工作，两倍发光血浆表面alloying技术在纯Zr表面上被用于copperizing。而且，X光检查衍射(XRD)，扫描电子显微镜(SEM)和精力分散光谱(版本)被采用描绘样品。而且，研究也在不同答案在样品的极化曲线上被进行。表面上的Copperizing能在3.5改进纯Zr的腐蚀抵抗?%NaCl并且0.5?摩尔

简介：SinceOctober2008,China'ssocialconsumptionofelectricityhad,forthefirsttime,grownnegativelycomparedtothesameperiodofthepreviousyear,andinNovemberthenegativegrowthrangefurtherexpanded.Themajorpressurefacedbytheelectricityindustryhasnowturnedfromthecontradictionbetweencoalandelectricitytoelectricityquantity.Thisisundoubtedlyatrueandnewtesttoelectricityenterpriseswhichgetusedtohighgrowthbutarenowsufferinggreatlosses.Thereformofelectricit...

简介：为紧张和温度测量的一个光纤维传感器与纤维基于长时期纤维栅栏(LPFG)串联了布拉格栅栏(FBG)结构理论上并且试验性地被建议了并且认识到。有类似的敏感的二微观结构不能被用于的理论分析表演加倍参数测量。LPFG是由CO2激光的micromachined，并且FBG是由excimer激光的micromachined。为确认和比较，二FBG和一LPFG与三条传播山谷被串联，也就是在1536.3nm，在1551.2nm的LPFG山谷，和在1577.3nm的FBG2山谷的FBG1山谷。建议传感器的温度和紧张特征在4570椠歮愠獢牯敢獲愠敲映物瑳祬搠瑥牥業敮?桴潲杵?桰瑯慯潣獵楴?湡?灳'虪沟茲滀髷疇罐鏇V畳敲敭瑮?瑡琠敨猠浡?被测量硥楣慴楴湯?桷捩?敤潭獮牴瑡獥琠敨映慥楳楢楬祴漠?桴獩洠瑥潨d

简介：钴铁酸盐CoxNi1?xFe2O4(x=0，0.5，1)有可控制的磁性的粒子被先锋经由包含分开的成核和老化步(SNAS)的一个可伸缩的方法准备了的共同代替的NiFe2+Fe3+分层的双氢氧化物(NiFe2+Fe3+-LDH)的锻烧准备了。他们的结构、磁性的特征被粉末X光检查衍射(XRD)调查，扫描电子显微镜学(SEM)和颤动的样品magnetometry(VSM)。浸透磁化(女士)和锻烧的产品的coercivity(Hc)与增加钴内容增加了的磁性表演的大小。CoFe2+Fe3+-LDH和NiFe2+Fe3+-LDH的混合物的锻烧获得的LDH基于先锋的产品与1:1的Co/Ni臼齿的比率搽粉，为一位Co0.5Ni0.5Fe2+Fe3+-LDH先锋的锻烧准备的Ni0.5Co0.5Fe2O4材料与相应价值相比展出女士的中等价值和Hc的增加的价值，并且有1:1的Co/Ni臼齿的比率的CoFe2O4和NiFe2O4的物理混合物。这些结果可以提供一个方法由改变LDH先锋的作文调整铁酸盐尖晶石的磁性的anisotropy。

简介：Three-dimensionalseepageindoublefracturedmediawasmodeledinthispaper.Thedeterminationofhydraulicconductivitytensorofrockmassisavitalproblemfortheseawaterintrusionorseawaterencroachmentandseepageoffissuredmedium.Accordingtothegeologicalandhydrogeologicalconditionsforthe2nd-stageconstructionoftheThreeGorgesProject(TGP),thephysicalandmathematicalmodelsforthegroundwatermovementthroughthe3Ddoublefracturedmediaofrockmassduringconstructionwereestablishedinthispaper.Basedondiscontinuity-controlinversetheory,somerelatedparametersofdoublefracturedmediawereinversedwithfluxbeingtheknownquantityandcalibrationofwatertabletheobjectivefunction.Synchronously,theseepagefieldoftheconstructionregionwassystematicallyanalyzedandsimulated,theresultsofwhichexhibitthatthedoublefracturedmediamodeloffracturewatercancomprehensivelyandcorrectlydescribethegeologicalandhydrogeologicalconditionsintheconstructionregion.

简介：Thestrueturaleffectoftheconjugativesystem(C)withcarbonyl-iminobridgeshasbeenstudied.Theresultsshowthat:Intheconjugatedsystem(C),thereisnoelectronicabsorptionpeakattributabletothewholesystem,buttherearethreeπ-π*bandseachntwhichdisplayschacactecisticsofitsownindependently.Theseindicatethatthetwobridges-carbonyl-and-imino-canblockthetlanSmlSSionoftheconjngativepolarizationofthewholesystem,soastoformthreesegments,thisisverifiedbymeansofchemicalsynthesisanddegradation.

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简介：一根双横梁在红外线附近的分光计被开发在紧张补偿水吸收和仪器的飘移。分光计可以被用于单个、双的横梁大小，并且二个操作模式被比较。结果证明双横梁技术在单个横梁测量消除仪器的飘移，因此，系统的稳定性增加超过20%。水吸收上的双横梁系统的赔偿被胖内容的测量在牛奶验证。结果证明光谱数据比传统的单个横梁模式基于两倍横梁模式得到更好的刻度模型和更低的预言错误。CLC数字TH744.1-TN219-O433.1这个工作被中国(号码2004BA706B12)和天津(No.023800411)的自然科学关键基础的第10五个年计划支持。

简介：The810-nmInGaAlAs/AlGaAsdoublequantumwell(QW)semiconductorlaserswithasymmetricwaveg-uidestructures,grownbymolecularbeamepitaxy,showhighquantumefficiencyandhigh-powerconver-sionefficiencyatcontinuous-wave(CW)poweroutput.Thethresholdcurrentdensityandslopeefficiencyofthedeviceare180A/cm~2and1.3W/A,respectively.Theinternallossandtheinternalquantumefficiencyare1.7cm~(-1)and93%,respectively.The70%maximumpowerconversionefficiencyisachievedwithnarrowfar-fieldpatterns.