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简介：Thispaperproposesasortofnewnormalformsconsistingofobserverformandcontrollableformfornonlinearsystems.Theconditionsfortransformingtothesenormalformsaregiven,respectively.Thesenormalformsareusedtotreattheproblemsofobserverdesignandlinearization.Thefirstpartofthispaperdealswiththeobserverform,andthesecondthecontrollableform.

简介：UsingvariationalmethodsandMorsetheory,weobtainsomeexistenceresultsofmultiplesolutionsforcertainsemilinearproblemsassociatedwithgeneralDirichletforms.

简介：Thedistributionofrareearthelement(REE)formsinsoilsisgiveninthepresentpaperonthebasisofsequentialfractionationanddeterminationof34representativesurfacesoilscollectedfromallpartsofChina.ResultsobtainedshowthattheextractionrateofwatersolubleandexchangeableREEhadtheodd-evenphenomenonandthatoforganicallyboundREEfromLatoLutendedtoreducegraduallywiththeincreaseofatomicnumber.ThestabilityofScandtheactivityandenrichmentofTminsoilsareproposed.Furthermore,thepapermakesapreliminarydiscussiononthedifferencesintheconcentrationdistributionofvariousformsofindividualREEinsomesoils.

简介：BasedonanalysesofsurfaceandcoresedimentsinthetidalflatsoftheYangtzeEstuaryandcoastalareas,thepresentstudyrevealsphosphorousformsexistinginsedimentsandtheirdistributions.Theresultsshowthatphosphorusintidalflatsedimentsinthestudyareamainlyconsistsofinorganicphosphorousforms,involvingDP,Fe-P,Al-P,andCa-Pandorganicphosphorousforms,inwhichCa-PandOParedominantcompositions.Thisfindingindicatesthatspatialdistributionsofvariousphosphorousformsarerelatedtosedimentaryenvironmentsinwaterandgrainsizesofsediments,andareinfluencedbysewagedischargesandeffluentsfromaquacultivationinthecoastalareas.

简介：ExperimentswerecarriedoutonavegetablefieldwithPekingcabbage(Brassicapekinensis(Lour.)Rupr.),cabbage(Brassicachinensisvar.OleiferaMakinoandnemoto),greencabbage(BrassicachinensisL.),spinach(SpinaciaoleraceaL.)andrape(BrassicacampestrisL.)tostudytheeffectsofNformsandNratesontheirgrowthandnitrateaccumulation.Theresultsindicatedthatapplicationofammoniumchloride,ammoniumnitrate,sodiumnitrateandureasignificantlyincreasedtheyieldsandnitrateconcentrationsofPekingcabbageandspinach.Althoughnosignificantdifferencewasfoundintheyieldsafterapplicationofthe4Nforms,nitrateNincreasednitrateaccumulationinvegetablesmuchmorethanammoniumN.ThevegetableyieldswerenotincreasedcontinuouslywithNrateincrease,andoversupplyofNreducedtheplantgrowth,leadingtoayielddecline.Thistrendwasalsotruefornitrateconcentrationsinsomevegetablesandatsomesamplingtimes.However,asawhole,thenitrateconcentrationsinvegetableswerepositivelycorrelatedwithNrates.Thus,additionofNfertilizertosoilwasthemajorcauseforincreasesinnitrateconcentrationsinvegetables.Nitrateconcentrationsweremuchhigherinroots,stemsandpetiolesthaninbladesatanyNrate.

简介：Prestinisthemotorproteinofcochlearouterhaircells(OHCs).ItisabletoperformrapidandreciprocalelectromechanicalconversionthatunderliesOHCelectromotility.Duetotheinadequatesizeofasingleprestinmoleculetoformthe~12nmintramembraneousproteinparticles(IMPs)intheOHClateralmembrane(LM),thepossibilityofprestinoligomerizationhasbeenproposed.Ithasbeensuggestedthatprestinmoleculesformhighorderoligomers,mostlikelyasthetetramer,inheterologoussystems.InOHCs,however,theoligomericstructureofprestinremainsunclear.Herewecalculatedtheprestin-relatedchargedensityinbothgerbilandguineapigOHCsthroughmeasuringtheirnonlinearcapacitance(NLC)andLMsurfacearea,showingthattheaveragechargedensity(22,608μm-2ingerbils;19,460μm-2inguineapigs)isstatistically4timestheaveragedensityofIMPs(5,686μm-2ingerbils;5,000μm-2inguineapigs).ThissuggeststhateachIMPcontainsfourprestinmoleculesbaseduponthenotionthateachprestintransfersasingleelementarycharge,implyingthatprestinformstetramersinOHCs.Todeterminewhethertheprestintetramerfunctionsasamechanicalunit,wesubsequentlycomparedtheslopefactors(α)ofelectromotilityandNLCsimultaneouslymeasuredfromthesameOHC,showingthattheαvaluesofthetwoarestatisticallythesame.ThissuggeststhateachprestinmoleculeinthetetramerismechanicallyindependentandequallycontributestoOHCelectromotility.

简介：像网络管理和工作流程处理一样，许多应用程序都需要一个绘图接口，然而在Windows应用程序中开发诸如Visio这样的绘图接口是一项令人生畏的任务。在本文中，笔者演示了如何基于UserControl和一些简单的类生成一个简单绘图工具。

简介：Inthispaper,withPoincare’sformalism,andanindirectmethod,thecanonicalformsofthegeneralizedequationsofmotionduetoNielsenandCenovofaholonomicdynamicalsysteminthevelocity-phasespaceandtheacenleration-phasespaceareobtainedintermsofthePoincareparameters.

简介：参数是通过参数表传送到被调用Form的,本文介绍了Oracle数据库的开发工具Developer/2000之一OracleForms4.5中的参数及参数表的概念、创建方法以及开发Form并传送参数的注意事项,或者在对象属性中引用参数

简介：Atelevatedtemperatureregimesandabundantprecipitation,mobilizationandaccretionofweatheredironoxidesarepromotedespeciallyinareducedenvironmentsinthetropics.Thismayleadtotheformationofplinthite,whichhardensirreversiblyuponrepeatedwettinganddryingtoformpetroplinthite.Theneedforthisreviewstemsfromtheseeminglydearthofinformationonthesubjectandaneedtoclarifydifferenttermsusedindescribingplinthite.Wereviewvariousresearchworksonplinthiteanditsassociatedpedogenicformsinthetropics.Furthermore,weprofferrecommendationsastothemostappropriatelandusemanagementpracticesthatcouldhelpminimisetheenvironmentalandagronomicproblemsassociatedwithplinthiteanditsrelatedpedogenicforms.Parentmaterial,temperature,seasonalityandgeomorphologyarecriticalfactorsthatinfluencesoilwaterregimewhichinturnaffectthepedogenesisofplinthite.SoilpHandmineralogyareadditionalfactorsthatcouldalsopromoteplinthiteformation.Fossilplinthicsoilsarepotentialproxiesforpalaeoenvironmentalreconstruction.Measuresusedinthemanagementofplinthicsoilsincludemechanicallybreakingthehardpansandtheuseoforganicandinorganicamendmentstomodifythestructureandchemistryofthesoils.Avoidanceofpracticesthatwouldpredisposesoilstoerosionwouldalsopreventplinthization.Wecallfortherelinquishmentoftheterm'laterite'whichisageneraltermforallformsofironoxide-enrichedearthymaterialsasusedforplinthite.PlinthichorizonshouldalsobeincorporatedintotheUnitedStatesDepartmentofAgricultureSoilTaxonomyinviewofitsgrowingimportanceinsoils.

简介：LetDbeaboundedC3-domaininRdand(aij)beaboundedsymmetricmatrixdefinedonD.Considerthesymmetricform（u,v）=1/2∫Daij（x）（u（x））/（xi）（v（x））/（xj）dx,u,v∈H1（D）.UndersomeassumptionsitisshownthatthediffusionprocessassociatedwiththeregularDirichletspace(,（H1（D））onL2（D）canbecharacterizedasauniquesolutionofacertainstochasticdifferentialequation.

简介：Asequentialextractionmethodforthefractionationofphosphorus(P)inlakesedimentswasusedtoanalyzephosphorusfractionsofsedimentstakenfromthreelarge,shallow,eutrophicfreshwaterlakesofChina-TaihuLake,ChaohuLake,andLongganLake.AllthreelakesarelocatedinthelowerreachesoftheChangjiangRiver(YangtzeRiver).InTaihuLakeandChaohuLake,algaebloomsoccurredeveryyear,whileLongganLakewasamacrophyte-dominatedlake.Resultsshowedthatexchangeablephosphorusfractionsweremuchhigherintheeutrophiclakesedimentsthaninthemacrophyte-flourishinglakesediment.Also,theratioofFe:Pinthesedimentsofthealgae-predominantlakeswasgenerallymuchlowerthanthatinthemacrophyte-predominantlakes.Thus,thegeochemicalfractionsofphosphorusinsedimentshadacloserrelationshipwiththetypeofaquaticvegetation.

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简介：在实际的Web应用开发中,ASP开发人员总是喜欢自己解决用户身份认证问题,不过ASP.NET已经支持内置的认证功能.本文通过一个实例分析如何用很少的代码使用FormsAuthentication并采用shal口令加密哈希算法实现更加安全的Web应用.

简介：AbilinearformfonanonassociativetriplesystemTissaidtobeinvariantifandonlyiff(,d)=f(a,)=f(c,)foralla,b,c,d∈T.(T,f)iscalledapseudo-metrictriplesystemiffisnon-degenerateandinvariant.Adecompositiontheoryfortriplesystemsandpseudo-metrictriplesystemsisestablished.Moreover,thefinite-dimensionalmetricLietriplesystemsarecharacterizedintermsofthestructureofthenon-degenerate,invariantandsymmetricbilinearformsonthem.

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简介：IntroductionRutile,acommonoxidemineral,widelyoccursindifferentgeologicalenviron-ments.Inigneousrocks,especiallyinplutonicrocks,itexistsasaminormineralingranularform,sometimesintheformoflargecrystalsinpegmatites.Asanaccessarymineral,rutilecanbefoundinmanymetamorphicrockssuchasamphiboliteandeclogite.Itisnotararecasetofindrutileinsedimentsasadetritalmineral.

简介：InthispaperwestudyBacklundtransformationsoftime-likelinearWeingartensurfaceswithnegativediscriminantinLorentzianspaceforms.