简介：这篇论文在poroelastic一半空间由一个2-D洞为飞机SV波浪的衍射论述一个间接边界集成方程方法。格林的功能压缩并且砍波浪来源基于Biot的理论被导出。散布波浪近用虚构波浪来源被构造到洞的边界，并且他们的大小被边界条件决定。精确性的确认旁边被执行：(1)检查边界的满足程度调节，(2)把一个single-phased盒子的堕落答案与著名答案作比较，并且(3)检验答案的数字稳定性。在在poroelastic一半空间的一个洞附近的飞机SV波浪的衍射的性质被数字例子调查。

简介：Inthefirsthalfyearof2018,therewerechangesinChina'seconomic,industrialstructureandthechangesingovernment'spolicyonlandandmineralresources.China'sgeologicalexplorationiscontinuedtomaintainatrendofthegrowth.Thefundinvestmentingeologicalexplorationdeclinedandtheimpetusforinvestmentininitialexplorationwasinsufficient.Theminingmarketshowedagooddevelopmenttrendandthesocialinvestmentdepictedaslightrise.Inthefirsthalfoftheyear,theinvestmentsinhydrogeologicexploration,environmentalgeologyexplorationandgeologicaldisasterinvestigationincreasedontheyear-onyearbasis.

简介：Inthispaper,ananalyticmethodisdevelopedtoaddresssteadySH-wavescatteringandperformdynamicanalysisofmultiplecircularcavitiesinhalfspace.ThescatteredwavefunctionusedforscatteringofSH-wavesbymultiplecircularcavities,whichautomaticallysatisfiesthestress-freeconditionatthehorizontalsurface,isconstructedbyapplyingthesymmetryoftheSH-wavescatteringandthemethodofmulti-polarcoordinatessystem.Applyingthisscatteredwavefunctionandmethodofmovingcoordinates,theoriginalproblemcanbetransformedtotheproblemofSH-wavescatteringbymultiplecircularcavitiesinthefullspace.Finally,thesolutionoftheproblemcanbereducedtoaseriesofalgebraicequationsandsolvednumericallybytruncatingtheinfinitealgebraicequationstothefiniteones.Numericalexamplesareprovidedforcasewithtwocavitiestoshowtheeffectofwavenumber,andthedistancesbetweenthecentersofthecavitiesandfromthecenterstothegroundsurfaceonthedynamicstressconcentrationaroundthecavityimpactedbyincidentsteadySH-wave.

简介：DiffractionofplanePwavesaroundanalluvialvalleyofarbitraryshapeinporoelastichalf-spaceisinvestigatedbyusinganindirectboundaryintegralequationmethod.BasedontheGreen'sfunctionsoflinesourceinporoelastichalf-space,thescatteredwavesareconstructedusingthefictitiouswavesourcesclosetotheinterfaceofthevalleyandthedensityoffictitiouswavesourcesaredeterminedbyboundaryconditions.Theprecisionofthemethodisverifiedbythesatisfactionextentofboundaryconditions,andthecomparisonbetweenthedegeneratedsolutionsandavailableresultsinsingle-phasecase.Finally,thenatureofdiffractionofplanePwavesaroundanalluvialvalleyinporoelastichalf-spaceisinvestigatedindetailthroughnumericalexamples.

简介：在遥感监视的中国的典型区域基于冰河区域变化记录，吗象从139的空气温度和降水的气象学的数据一样驻扎并且0??????????????????????????吠慭吗？？

简介：Thispaperpresentsaclosed-formsolutionfordiffractionofplaneSHwavesbyasemi-circularcavityinhalf-spacebyusingwavefunctionexpansionmethod.Accuracyofthesolutionischeckedbythedisplacementresidualandstressresidualalongtheboundaries.Numericalresultsshowthattherearenotabledifferencesforresponseamplitudesbetweenasemi-circularcavityandawhole-circularcavityinahalf-space.

简介：由地志的特征散布飞机嘘波浪在一分层横着各向同性(TI)一半空间被使用一个间接边界元素方法(IBEM)调查。第一，反飞机分层的TI一半空间的动态僵硬矩阵被建立，免费的地被使用直接僵硬方法解决。然后，草地函数为在分层的TI一半空间对一根使倾向的线起作用的一致地分布式的负担被导出，散布的地与推出的草地函数被构造。最后，免费的地被加到散布的获得全球动态回答。方法被把结果与出版的各向同性的作比较验证。两个都，不变、短暂的动态回答被评估并且讨论。在频率领域的数字结果证明为TI媒介的表面运动能与为各向同性的案例的那些显著地不同，它强烈依赖于anisotropy性质，事件角度和事件频率。在时间领域的结果证明材料anisotropy在最大的持续时间和时间历史的最大的振幅上有重要效果。

简介：Thispaperpresents2.5DscatteringofincidentplaneSHwavesbyacanyoninlayeredhalf-spacebytheindirectboundaryelementmethod(IBEM).Thefreefieldresponseiscarriedouttogivethedisplacementsandstressesonthelinewhichformsboundaryofthecanyon.ThefictitiousuniformmovingloadsareappliedtothesamelinetocalculatetheGreen'sfunctionsforthedisplacementsandstresses.Theamplitudesoftheloadsaredeterminedbytheboundaryconditions.Thedisplacementsduetothefreefieldandfromthefictitiousuniformmovingloadshavetobeaddedtoobtainthewholemotion.Thenumericalresultsarecarriedoutforthecasesofacanyoninhomogenousandinonelayeroverbedrock.Theresultsshowthatthe2.5Dwavescatteringproblemisessentiallydifferentfromthe2Dcase,andthereexistdistinctdifferencesbetweenthewaveamplificationbyacanyoninlayeredhalf-spaceandthatinhomogeneoushalf-space.Thereasonsforthedistinctdifferenceareexplored,andtheeffectsofthethicknessandstiffnessofthelayerontheamplificationarediscussed.

简介：BasedonthesolutionsoftheGreen'sfunctionforasaturatedporousmediumobtainedbytheauthors,andusingtransformationofaxisymmetriccoordinates,Sommerfeldintegralsandsuperpositionoftheinfluencefieldonafreesurface,theauthorshaveobtaineddisplacementsolutionsofasaturatedporousmediumsubjectedtoatorsionalforceinahalf-space.Therelationshipcurvesofthedisplacementsolutionsandvariousparameters(permeability,frequency,etc.)underactionofaunitoftorquearealsogiveninthispaper.TheresultsareconsistentwithpreviousReissner'ssolutions,whereatwo-phasemediumdecaystoasingle-phasemedium.Thesolutionisusefulinsolvingrelevantdynamicproblemsofatwophasesaturatedmediuminengineering.

简介：Athird-ordercorrectionwasrecentlysuggestedtoimprovetheaccuracyofthehalf-powerbandwidthmethodinestimatingthedampingofsingleDOFsystems.Thispaperanalyzestheaccuracyofthehalf-powerbandwidthmethodwiththethird-ordercorrectionindampingestimationformulti-DOFlinearsystems.Dampingratiosinatwo-DOFlinearsystemareestimatedusingitsdisplacementandaccelerationfrequencyresponsecurves,respectively.Awiderangeofimportantparametersthatcharacterizetheshapeoftheseresponsecurvesaretakenintoaccount.Resultsshowthatthethird-ordercorrectionmaygreatlyimprovetheaccuracyofthehalf-powerbandwidthmethodinestimatingdampinginatwo-DOFsystem.Inspiteofthis,thehalf-powerbandwidthmethodmaysignificantlyoverestimatethedampingratiosoftwo-DOFsystemsinsomecases.

简介：Gene-centromeremappingisanessentialprerequisiteforunderstandingthecompositionandstructureofgenomes.Half-tetradanalysisisapowerfultoolformappinggenesandunderstandingchromosomalbehaviorduringmeiosis.TheJapanesescallop(Patinopectenyessoensis),acold-tolerantspeciesinhabitingthenorthwesternPacificcoast,isacommerciallyimportantmarinebivalveinAsiancountries.Inthisstudy,inheritanceof32informativemicrosatellitelociwasexaminedin70-hD-shapedlarvaeofthreeinducedmeiogynogeneticdiploidfamiliesofP.yessoensisforcentromeremappingusinghalf-tetradanalysis.Theratioofgynogeneticdiploidswasproventobe100%,100%and96%inthethreefamilies,respectively.Inheritanceanalysisinthecontrolcrossesshowedthat51ofthe53genotypicratiosobservedwereinaccordancewithMendelianexpectationsatthe5%levelafterBonferronicorrection.Sevenofthe32microsatellitelocishowedtheexistenceofnullallelesincontrolcrosses.Theseconddivisionsegregationfrequency(y)ofthemicrosatellitelocirangedfrom0.07to0.85withameanof0.38,suggestingtheexistenceofpositiveinterferenceafterasinglechiasmaformationinsomechromosomesinthescallop.Microsatellite-centromeredistancesrangedfrom4cMto42cMundertheassumptionofcompleteinterference.Informationonthepositionsofcentromeresinrelationtothemicrosatellitelociwillrepresentacontributiontowardstheassemblyofgeneticmapsinthecommerciallyimportantscallopspecies.

简介：ThisstudyproposesaGreen’sfunction,anessentialrepresentationofwater-saturatedgroundundermovingexcitation,tosimulategroundbornevibrationfromtrains.First,generalsolutionstothegoverningequationsofporoelasticmediumarederivedbymeansofintegraltransform.Secondly,thetransmissionandreflectionmatrixapproachisusedtoformulatetherelationshipbetweendisplacementandstressofthestratifiedground,whichresultsinthematrixoftheGreen’sfunction.ThentheGreen’sfunctioniscombinedintoatrain-track-groundmodel,andisverifiedbytypicalexamplesandafieldtest.Additionalsimulationsshowthatthecomputedgroundvibrationattenuatesfasterintheimmediatevicinityofthetrackthaninthesurroundingarea.Thewavelengthofwheel-railunevennesshasanotableeffectoncomputeddisplacementandporepressure.Thevariationofvibrationintensitywiththedepthofgroundissignificantlyinfluencedbythelayeringofthestratasoil.WhenthetrainspeedisequaltothevelocityoftheRayleighwave,theMachconeappearsinthesimulatedwavefield.TheproposedGreen’sfunctionisanappropriaterepresentationforalayeredgroundwithshallowgroundwatertable,andwillbehelpfultounderstandthedynamicresponsesofthegroundtocomplicatedmovingexcitation.

简介：Thispaperstudiesthree-dimensionaldiffractionofobliquelyincidentplaneSHwavesbytwininfinitelylongcylindricalcavitiesinlayeredporoelastichalf-spaceusingindirectboundaryelementmethod.Theapproachisvalidatedbycomparisonwiththeliterature,andtheeffectsofcavityinterval,incidentfrequency,andboundarydrainageconditiononthediffractionarestudiedthroughnumericalexamples.Itisshownthat,theinteractionbetweentwocavitiesissignificantandsurfacedisplacementpeaksbecomelargewhentwocavitiesareclose,andthesurfacedisplacementmaybesignificantlyamplifiedbytwincavities,andtheinfluencerangewithlargeamplificationcanbeaswideas40timesofthecavityradius.Surfacedisplacementsindryporoelasticcaseandsaturatedporoelasticcaseswithdrainedandundrainedboundariesareevidentlydifferentundercertaincircumstances,andthedifferencesmaybemuchlargerthanthoseinthefree-fieldresponse.