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简介：X-rayphotoelectronspectroscopy(XPS)wasadoptedtoelucidatesorptionmechanismofphenolandp-nitrophenolontoaweaklyanionexchangerD301.ThedistributionofspecificformsoftertiaryaminogrouponD301wasobtainedandeffectoffreetertiaryaminogrouponphenolsorptionontoD301wasdiscussed.TheresultindicatedthatthepercentoftheprotonatedtertiaryaminegrouponpolymericmatrixwasmuchlowerthanthereferencecompoundN,N-dimethylbenzylamineatanidenticalpHvalueinsolutionduetothemuchloweractivitydegreeofhydrogenionininnerresinphasethanintheexternalsolution.LessfreeaminogrouponD301resultsinlesssorptioncapacityofphenolandp-nitrophenolinanacidicsolution.UndertheexperimentalconditionsbothphenolsorptionontoD301canbeexplainedassolidextractionandthedistributioncoefficientvarieslinearlywiththecontentoffreeaminogrouponD301.

简介：Toanalyzethedynamicmechanismofunusualactivitiesofthesubtropicalhigh,thespace-timevaribleseparationofthepartialdifferentialvortexequationsiscarriedoutwithGalerkinmethodsbasedontheheatforceandthewhirlmovementdissipationeffect.Aimingatthesubjectiveandman-madeconventionalmethodofchoiceinthespacebasisfunctions,weproposetocombinetheempiricalorthogonalfunction(EOF)analysiswiththegeneticalgorithmtoinversethespacebasisfunctionsfromtheactualsequenceoffields.Agroupoftrigonometricfunctionsarechosenasageneralizedspacebasisfunction.Withtheleast-squareserrorofthebasisfunctionandEOFtypicalfields,andwiththecompleteorthogonalityofbasisfunctions,wecangetthedual-boundfunction.Ageneticalgorithmisthenintroducedtocarryoutsurfacefittingandcoeffcientoptimizationofthebasisfunction.Asaresult,theobjectiveandreasonableconstantdifferentialequationofthesubtropicalhighisobtainedbyinversion.Finally,basedontheobtainednonlineardynamicsmodel,thedynamicbehaviorandmechanismofthesubtropicalhighisanalyzedanddiscussedundertheinfluenceofheatforce.Wefindthatsolarradiationandzonaldifferencesinlandandseaareimportantfactorsimpactingthepotentialfieldandflowfieldchangesofthesubtropicalareas.Thesefactorsleadtostrengthchangesofthesubtropicalhighandmedium-termadvance/retreatactivities.Theformerisagradualchange,whilethelattershowsmorebreakcharacteristics.Meaningfulresultsareobtainedintheanalysis.

简介：Inthispaper,withK+,Ca2+andFe3+astheobjectsofstudy,retardationofsoil–bentonite(SB)barriermaterialsformetalionswithdifferentvalencesisinvestigated,andtheadsorptionmechanism,migrationpatternsandpermeationbehaviorareexploredsoastoprovideatheoreticalbasisfortheirapplication.TheresultsshowthattheadsorptionprocessformetalionswithdifferentvalencesbySBbarriermaterialsisfast,andthehigherthevalence,thegreatertheadsorptioncapacity.Thefttingoftheadsorptionprocessconformstopseudo-second-orderadsorptionkineticsandLangmuir–Freundlichadsorptionequation,whichexplainsthatchemicaladsorptionisthedominatingstateandthattheSBsurfacehascertainheterogeneity.ThepermeabilitycoeffcientofK+,Ca2+andFe3+inSBeachhasamaximumandthehigherthevalence,thesoonerthemaximumappears.Alsothehigherthevalence,themoreobvioustheeffectonSBretardationperformance;andthesoonertheionbreaksthroughthebarrierwallcompletely,thatis,thewall’sretardationperformanceforhighervalentionsmaydecline.

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简介：Thispapertreatstheflowinstabilitiesinamixedflowpumpwithavaneddiffuser.Testpumphasapositiveslopeofahead-flowperformancecurveat65%flowrateofBEP(BestEfficiencyPoint)becauseofarotatingstall.DynamicParticleImageVelocimetry(PIV)andpressurefluctuationmeasurementsareusedforinvestigatingthepropagationmechanismofarotatingstall.Itwasfoundthatunstableperformancewascausedbyperiodicallargescaleabruptbackflowgeneratedfromthevaneddiffusertotheoutletofimpeller.Further,therelationbetweenthestaticpressureattheinletofdiffuservaneandtheinternalflowconditionwasclarified.Fromtheseexperimentalresults,inordertoimprovethepositiveslopeofahead-flowperformancecurve,tosuppressthegrowthofstrongvortextowardtheinletofdiffuservanewasprovedtobeakeypoint.

简介：Thethermalbehavior,mechanismandkineticparametersoftheexothermicdecompositionreactionof3,3-bis(azidomethyl)oxetane/tetrahydrofuran(BAMO/THF)copolymerinamodehavebeeninvestigatedbymeansofDSC,TG-DTG,fastandlowerthermolysis/FrIRandTG-MS.Thereactionmechanismwasproposed.Theapparentactivationenergyandpre-exponentialconstantofexothermicdecompositionreactionofthecompoundat0.1MPaare167.04kJ·mol^-1and10^14.41s^-1,respectively.ThecorrespondingcriticaltemperaturesofthermalexplosionobtainedfromtheonsettemperatureTeandthepeaktemperatureTpare223.20and245.78℃,respectively.ThekineticequationoftheexothermicdecompositionprocessofBAMO/THFat0.1MPacouldbeexpressedas:dα/dT=10^15.19[-ln(1-α)^2/3e^-2.009×10^4/T

简介：利用Gaussian94节目包裹，涉及o-pyridyl基的分解反应的所有种类在B3LYP/6-311++G*充分被优化*水平。内在的反应坐标计算被采用证实转变状态和产品的连接，并且转变状态被想象的频率(0或1)的数字查明。反应机制被震动的模式分析和电子人口分析阐明，并且反应率常数与转变状态理论是计算的。

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简介：水可分散的银nanoparticles(AgNps)用thiacalix被准备[4]arenetetrahydrazide(TCTH)作为一个减少并且稳定的代理人。TCTH-AgNps被表面电浆子回声(SPR)描绘，传播电子显微镜学(TEM)和精力散X光检查(EDX)。相对一致20?nmTCTH-AgNps的球形的粒子高效地在5-9并且从10-40的一个pH范围上被形成??甠瑬慲潳楮慣楴湯???€敆？？

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简介：Flowercolorastheimportanteconomicindicatorforornamentalplantshasbecometheprimarytargetforornamentalimprovingandbreeding.Heavyionmutationtechnologyasauniqueandefficientmutagenhasbeenwidelyusedingermplasminnovationandplantbreeding.Inourstudy,150youngshootsofPelargoniumwereexposedto80MeV/ucarbonionsandfinallyonestablegeneticflowercolormutantwasobtainedatdosageof30Gy.Comparingwithwildtype,thephysiologicalindexesofmutantdisplayedsignificantdifferences.Thecolorofpetalinmutantwaschangedfromredtolightpink,andthecolorofpeduncleandtoruswaschangedfromgreentored,aswellasthepistilsandstamens’colorwerechangedfromyellowgreentopurplishred.

简介：Understeady-stateconditions,thegeneralcurrentsofEEreactionsatdisk,hemisphericalandsphericalmicroelectrodesarederived.Fromtheseequations,someelectrodereactionparameterscanbeverysimplyobtained.

简介：Theformationmechanismofmonodispersepolymerlatexparticlesintheemulsifier-freeemulsionpolymerizationofmethylmethacrylateandbutylacrylatewithpotassiumpersulfateasinitiatorwasinvestigated.Amulti-stepformationmechanismforthemonodispersepolymerparticleswasproposed.Thenucleationmechanismisconsideredtobethecoagulationoftheprecursorparticlesbyhomogeneousnucleationwhentheprimaryparticlesreachacriticalsizewithhighsurfacechargedensityandsufficientstability.Ithadbeenprovedbyaspecialexperimentthattheearlylatexparticlesformedbythecoagulationwerestable.Theprimaryparticlesgrowbyabsorbingmonomersandradicalsinthepolymerizationsystemandthenbecomecolloidallyunstableagainduetotheunderstandabledecreaseofparticlesurfacechargedensity,whichleadstotheaggregationofthegrowingparticlesandtheformationoflargerlatexpediclestherefrom.Anerthenucleationperiod,thepreferentialaggregationofthesmallerparticlesinthepropagationprocessleadstothechangeoftheparticlestowardsauniformsizeandnarrowerparticlesizedistribution.Thecoexistenceandcompetitionofhomogeneousnucleation,coagulation,propagationandaggregationresultintheincreaseofthepolydispersityindex(U=D43/D10)inthefirstStage,thenitsdecreaseinthelaterstagebecauseofthecompetitionofpropagationandaggregation,andthegradualformationofthemonodisperseparticles.

简介：Asaspecialgeologicalphenomenon,thecharacterofcollapsibleloessfoundationiscollapsiblewhenpenetratedbywater.Thischaracterleadstothesoillosingloadbearingcapacitylargelyandmayleadtofoundationfailure.Pileisapopularfoundationusedincollapsibleloess.Thesqueezedbranchandplatepileisanewtypeofpiledevelopedinrecentyearsandhasnotbeusedinaprojectbefore.Inthispaperthreesqueezedbranchandplatepilesaretestedincollapsibleloessafterimmersionprocessing.Theresultsmaybeusedforreferenceinsimilarconstructionproject,andtoprovidetheoreticalreferencesforde-signingofthesqueezedbranchandplatepilesinengineeringpractice.

简介：包含磷氮(MSMM-Al-P)的新奇包含的火焰retardant被与聚酰胺66包含准备(PA66-MSMM-Al-P)为聚酰胺6的火焰延迟(PA6)。结构和PA66-MSMM-Al-P的热性质被Fourier变换红外线的光谱学，X光检查光电子光谱学和thermogravimetric分析描绘。包含火焰retardants(MSMMAl-P和PA66-MSMM-Al-P)的PA6易燃被限制的氧索引测试，垂直燃烧测试和锥热量计调查。火焰retardancy和锥calorimetric分析在flame-retardantPA6建议了在PA66和MSMM-Al-P之间的synergistic效果。flame-retardantPA6的热稳定性也被调查。

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简介：ＩｎｔｒｏｄｕｃｔｉｏｎＴｈｅｓｕｂｔｒｏｐｉｃａｌａｎｔｉｃｙｃｌｏｎｅ（ｓｕｂｔｒｏｐｉｃａｌｈｉｇｈ）ｏｖｅｒＥａｓｔ＿Ａｓｉａｒｅｇｉｏｎｉｓａｎｉｍｐｏｒｔａｎｔｓｙｎｏｐｔｉｃｓｙｓｔｅｍｉｎｆｌｕｅｎｃｉｎｇｔｈｉｓｒｅｇｉｏｎ’ｓｗｅ...

简介：Theseeminglycontradictoryunderstandingsoftheinitialcrushstressofcellularmaterialsunderdynamicloadingsexistintheliterature,andacomprehensiveanalysisofthisissueiscarriedoutwithusingdirectinformationoflocalstressandstrain.Localstress/straincalculationmethodsareappliedtodeterminetheinitialcrushstressesandthestrainratesatinitialcrushfromacell-basedfiniteelementmodelofirregularhoneycombunderdynamicloadings.Theinitialcrushstressunderconstant-velocitycompressionisidenticaltothequasi-staticone,butlessthantheoneunderdirectimpact,i.e.theinitialcrushstressesunderdifferentdynamicloadingscouldbeverydifferenteventhoughthereisnostrain-rateeffectofmatrixmaterial.Apower-lawrelationbetweentheinitialcrushstressandthestrainrateisexploredtodescribethestrain-rateeffectontheinitialcrushstressofirregularhoneycombwhenthelocalstrainrateexceedsacriticalvalue,belowwhichthereisnostrain-rateeffectofirregularhoneycomb.Deformationmechanismsoftheinitialcrushbehaviorunderdynamicloadingsarealsoexplored.Thedeformationmodesoftheinitialcrushregioninthefrontofplasticcompactionwavearedifferentunderdifferentdynamicloadings.