简介：Atechniqueofelectronaccelerationinthecone-shapedstationarylaserfieldisproposed.Anelectronaccelerationinthislaserisstudied,whichshowsthatthereisnoelectronbunchingbutthereexistselectroncaptureinthislaserfield.

简介：BasedonimprovedchargecontrolmodelandcombiningGSWvelocity-fieldequa-tion,aseriesofanalyticalsolutionsforthestaticcharacteristicsofHIGFETssuchasID-VD-VG,IDS-VG,GmandCGarederived.Theresultsofcalculationarecomparedwithexperimentaldatareportedinreferences,withintherangeofVG<2V,ID

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简介：Terfenol-D杆是否应该被把压成薄片，具有在为动态应用设计一个magnetostrictive致动器的开始的担心。迭合能减少旋涡水流损失，而且减少GMM杆的僵硬。常规方法由是复杂的女性(有限元素的方法)或一个的经验。在这篇文章，在杆的剖面图的磁场分发的一条分析途径被描述，并且如果Terfenol-D杆应该被把压成薄片，它作为一个参考方法被介绍给法官。数字评估和试验性的结果证明了途径的合理性和可获得性。

简介：TheuniquegeographicallocationandhighaltitudeoftheTibetanPlateaucangreatlyinfluenceregionalweatherandclimate.Inparticular,theAsiansummermonsoon(ASM)anticyclonecirculationsystemovertheTibetanPlateauisrecognizedtobeasignificanttransportpathwayforwatervaporandpollutantstoenterthestratosphere.Toimproveunderstandingofthesephysicalprocesses,amulti-locationjointatmosphericexperimentwasperformedovertheTibetanPlateaufromlateJulytoAugustin2018,fundedbythefiveyear(2018–2022)STEAM(stratosphereandtroposphereexchangeexperimentduringASM)project,duringwhichmultipleplatforms/instruments—includinglong-durationstratosphericballoons,dropsondes,unmannedaerialvehicles,specialsoundingsystems,andground-basedandsatellite-borneinstruments—willbedeployed.Thesecomplementarymethodsofdataacquisitionareexpectedtoprovidecomprehensiveatmosphericparameters(aerosol,ozone,watervapor,CO2,CH4,CO,temperature,pressure,turbulence,radiation,lightningandwind);therichnessofthisapproachisexpectedtoadvanceourcomprehensionofkeymechanismsassociatedwiththermal,dynamical,radiative,andchemicaltransportsovertheTibetanPlateauduringASMactivity.

简介：Fieldmeasurementofstrongwindcharacteristicsisofgreatsignificanceforthedevelopmentofbridgewindengineering.LocatedineastChina,theRunyangSuspensionBridge(RSB)withamainspanof1490misthelongestbridgeinChinaandthethirdlongestintheworld.Duringthelastfouryears,theRSBhassufferedfromtyphoonsandstrongnorthernwindsonmorethantenoccasions.TodeterminethestrongwindcharacteristicsoftheRSB,windmeasurementdataobtainedfromfieldtestsduringstrongwindsanddatafromthewindenvironmentmonitoringsubsystemofthestructuralhealthmonitoringsystem(SHMS)oftheRSBwerecombinedtoanalyzethewindspeedanddirection,variationinwindspeedwithheight,turbulenceintensity,turbulenceintegrallength,windfrictionspeedandthepowerspectrum.Comparativestudiesonthecharacteristicsofthesedifferentstrongwindswerecarriedoutbasedonthecurrentwind-resistantdesignspecificationforhighwaybridges.ResultsshowedthatsomeregularityinwindcharacteristicscanbefoundinthesedifferenttyphoonspassingthroughtheRSB.Thedifferencebetweenastrongnorthernwindandatyphoonisrelativelyclear,andinsummerthetyphoonisthedominantwindloadactingontheRSB.Inaddition,thereweresomedifferencesbetweenthemeasuredstrongwindcharacteristicsandthevaluessuggestedbythespecification,especiallyinrespecttoturbulenceintensityandturbulenceintegrallength.ResultsprovidemeasurementdataforestablishingastrongwindcharacteristicdatabasefortheRSBandfordeterminingthestrongwindcharacteristicparametervaluesofthiscoastalareaineastChina.

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简介：为了学习terraced的影响，在一个分水岭的土壤侵蚀上回答建设和检查水坝siltation，我们包括terraced领域，斜坡农田，陡峭斜坡的草地，和水坝农田为黄土高原多山溪谷的区域造了一个简化分水岭模型，并且定义分水岭的三个状态(即，先驱，中介，和高潮阶段，分别地)。然后，在各种各样的阶段的分水岭土壤侵蚀moduli被使用一个修订通用土壤损失方程学习。我们的结果证明先驱和高潮阶段是分水岭soil-and-water保存和控制的极端状态；在先驱阶段，土壤侵蚀模量是299.56t牵?畢湲?潦敲瑳?潦?敲汣浡瑡潩?氠慥楤杮琠?桴?敤牣慥敳漠?牡潢?潰汬湥愠?‵慫??湩挠牯?牡慥?景琠敨夠湡獧慨?畣瑬牵吗？

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简介：Anewanalyticalmodelforthesurfaceelectricfielddistributionandbreakdownvoltageofthesilicononinsulator(SOI)trenchlateraldouble-diffusedmetal-oxide-semiconductor(LDMOS)ispresented.Basedonthetwo-dimensionalLaplacesolutionandPoissonsolution,themodelconsiderstheinfluenceofstructureparameterssuchasthedopingconcentrationofthedriftregion,andthedepthandwidthofthetrenchonthesurfaceelectricfield.Further,asimpleanalyticalexpressionofthebreakdownvoltageisobtained,whichoffersaneffectivewaytogainanoptimalhighvoltage.Alltheanalyticalresultsareingoodagreementwiththesimulationresults.

简介：这份报纸讨论吝啬地的向后的随机的微分方程(吝啬地的BSDE)与跳并且控制吝啬地的BSDE与的一种新类型跳，也就是吝啬地的BSDE与强烈跳结合了联系控制问题的价值功能。作者首先为BSDE的上述二种类型证明存在和唯一以及一条比较定理。为这，作者使用一个近似方法。在Peng在1997介绍的随机的向后的semigroups的观点的帮助下，然后，作者为值函数得到动态编程原则(DPP)。而且，作者证明值函数是integro部分的微分方程，它在连续函数的一个足够的空格唯一由Barles介绍了的联系非局部的Hamilton-Jacobi-Bellman(HJB)的一个粘性解决方案，等。在1997。

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简介：Thispaperpresentsalargefieldphase-shiftinginterferencemicroscopeformicro-surfacetopographymeasurement.APZTisusedastheZ-directionalphaseshifter.TheinterferencemicroscopeisthecombinationoftheinfinitytubemicroscopewiththeMirautwo-beaminterferometer.Two-dimensionalprecisionmotorizedstageisalignedasthescanningsystemintheX-andY-directiontoextendthetestsurfacemeasurementrangeto12.5mm×12.5mm.Theminimumdisplacementis0.039μmandtheoverlappedproportionis0.22.Afaststitchingalgorithmisproposedbasedongridmatching.Accordingtothereflectivityofthecoreandtheferrule,theplatewiththetransmission/reflectivityratioof70/30isselectedtobalancetheinterferenceintensity.Theinstrumentisprovedtobevalidbyactualmeasurementoftheendsurfaceofanopticalfiberconnector.

简介：当西方的和平的副热带的高度很快向西加强并且延长时，下降并且分叉的运动引起低级循环很快变弱以便乍见陆地TC将在短距离以后腐烂。副热带的高度什么时候变弱，登上并且收敛动人的向南方的运动并且与西的马槽东方的撤退将很长时间加强或维持低压的循环并且TC将盖住长土地距离。

简介：Inthispaper,theconceptofstationary-wavenonstationarityispresentedandelucidatedintheframeworkoftheLorenzcirculationdecomposition.Thisconceptindicatestherelativemagnitudeofthezonalnonuniformabnormitytotheintensityofstationarywavesonthemonthlymeanscale.BasedontheLorenzcirculationdecomposition,thenonstationaritydegreeI_(us)(I_(us)~1)oftheglobal(local)stationarywavesisdefined,andthenusedtoanalyzethestationary-wavenonstationarityat30°-60°N,wheretheintensityofstationarywavesat500hPaintheNorthernHemisphere,asiswellknown,isveryhigh.Thefollowingfindingsareobtained:(1)Thereexistseasonalsouthwardandnorthwardmovementsinthepositionofthenonstationarityzonesoftheglobalstationarywaves.Thesteadystationarywavesoccurinmidlatitudes(35°-55°N)inwinterandinthesubtropicalregion(southof35°N)insummer,associatedwiththemajortroughsoverEastAsiaandNorthAmericaandtheweakEuropeantroughinwinter,andwiththerelativelysteadysubtropicalhighsysteminsummer.AhighvaluecenterofI_(us)isat35°Ninspringand50°Ninsummer,whichmightbecausedbytheseasonalvariationofstationary-waveintensity,particularlyinassociationwiththeinterannualvariabilityoftrough/ridgepositionsofstationarywavesonthemonthlymeanmaps.(2)ThereexistsobviousasymmetryinI_(us)~1,withthesteadyzonesalwayslocatedintheareascontrolledbystrongtroughs/ridgesandtheunsteadyonesintheareaswherethestationary-waveintensityislow.TheI_(us)~1inthesubtropics(southof35°N)islargerinwinterthaninsummer,andviceversainthemidlatituderegion(northof35°N).ThesummertimedistributionofI_(us)~1onthewholeshowsarathercomplicatedstructure.However,NorthEuropeisthemostunsteadyareaforlocalstationarywaves,asrepresentedbyhighvaluesofI_(us)~1inbothsummerandwinter,whileovertheNorthAmericancontinent(about120°E-60°W),theI_(us)~1isslightlylessthan1

简介：Wereportonasystematicexperimentalstudyonthefluorescencespectraproducedfromafemtosecondlaserfilamentinairunderahighelectricfield.Theelectricfieldalonewasstrongenoughtocreatecoronadischarge(CD).Fluorescencespectrafromneutralandionicairmoleculesweremeasuredandcomparedwithpurehigh-voltageCDandpurelaserfilamentation(FIL).Amongthem,highelectricfieldassistedlaserFILproducednitrogenfluorescencemoreefficientlythaneitherpureCDorpureFILprocesses.Thenonlinearenhancementoffluorescencefromtheinteractionofthelaserfilamentandcoronadischargingelectricfieldresultedinamoreefficientionizationalongthelaserfilamentzone,whichwasconfirmedbythespectroscopicmeasurementofbothionization-inducedfluorescenceandplasma-scattered800nmlaserpulses.Thisisbelievedtobethekeyprecursorprocessforfilament-guideddischarge.

简介：这份报纸在伊朗在三条多山的河里基于23域大小论述卵石床和大石头床河的磨擦因素的结果。结果表明我们在多山的区域的大石头床河里的测量速度侧面的特征不介绍特定的形状，但是在卵石床河里说明特定的模式。这差别被归因放大效果相对浸没。亲戚在卵石和大石头床河浸没，这被发现是影响象粒子弗鲁德数字和弗鲁德数字那样的磨擦因素评价和其它参数的唯一的关键参数在卵石床和大石头床河的流动抵抗上有很少影响。为为磨擦因素的评价的建议关系应该为大粗糙床的河是有用的。

简介：BasedontheNCEP/NCARreanalysisIdailydatafrom1958to2002,climaticcharacteristicsofthe30-60-dayintraseasonaloscillations(ISOs)ofthezonalwind(u),meridionalwind(v),andgeopotentialheight(h)overglobalareasandespeciallytheISOofvoverthesubtropicalnorthernPacificareanalyzedusingthespace-timespectrumanalysisandwavelettransformmethods.TheresultsshowthattheISOofvisverydifferentfromthoseofuandh,withtheformerrepresentingthemeridionallow-frequencydisturbances,whicharethemostactiveinthesubtropicsandmid-highlatitudes,butveryweakinthetropics.InthesubtropicalNorthernHemisphere,theenergiesoftheISOsofuandharebothconcentratedonthewaveswithwavenumberof1andperiodsof30-60days,whilethemainenergyoftheISOofvisconcentratedonthewaveswithwavenumbersof4-6andperiodsof30-60and70-90days.Thewestwardpropagatingenergiesforthe30-60-dayoscillationsofu,v,andhareallstrongerthantheeastwardpropagatingenergiesinthesubtropics.Inaddition,theISOofvisthestrongest(weakest)insummer(winter)overthesubtropicsofEastAsiaandnorthwesternPacific,whilethesituationisreversedoverthesubtropicalnortheasternPacific,revealinga'seesaw'oftheISOintensitywithseasonsoverthesubtropicsfromthenorthwesterntonortheasternPacific.InthesubtropicalnorthwesternPacific,theinterannualandinterdecadalchangesoftheISOforvat850hPaindicatethatitsactivitiesaresignificantlystrongduring1958-1975,whileobviouslyweakduring1976-1990,andarethestrongestduring1991-2000,anditsspectralenergyisobviouslyabnormalbutrulelessduringtheENSOperiods.However,inthe2-7-yrbandpassfilteringseries,theinterannualchangesofthevISOoverthesubtropicalnorthwesternPacificcontaindistinctENSOsignals.Andinthe9-yrlow-passfilteringseries,thevISOchangesoverthesubtropicalnorthwesternPacificaresignificantlyoutofphasewiththechangesoftheNino-3.4SST,

简介：ＡｓｔｕｄｙｏｆａｎｅｗｒｅｔｒｉｅｖａｌａｌｇｏｒｉｔｈｍｆｏｒｍｅａｓｕｒｅｍｅｎｔｏｆｏｃｅａｎｉｃｗｉｎｄｖｅｃｔｏｒｓｆｉｅｌｄｕｓｉｎｇｓａｔｅｌｌｉｔｅｍｉｃｒｏｗａｖｅｓｃａｔｔｅｒｏｍｅｔｅｒＬｉｎＭｉｎｇｓｅｎ，ＳｕｎＹｉｎｇ，Ｚ...