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简介：WeusedearthquakecatalogsrecordedbyGuangdongSeismologicalNetworkfrom2008to2014toresolvethespatialvariationsofb-valuesinthecoastalareaofGuangdong,particularlyinthreekeyresearchareas(Yangjiang,Heyuan,andoffshoreNanaoIsland)withstrongseismicity.Ourresultsrevealedthatb-valuesexhibitedsignificantspatialvariations,andzoneswithlowb-valuescouldindicatethemostlikelyseismogenicareaoflargeearthquakes.Weobservedthreeclearlowb-valuepatchesintheoffshoreNanaoIsland.Wefoundadistincthighb-valuepeakatthedepthof11kmandtwominimumpeaksatabout14and7–8kmintheYangjiangarea.Theoverallb-valuesgenerallydecreasewithdepthintheHeyuanarea.Thespatialvariationsofb-valuesreflecttectonicanomalies;thatis,the‘low-high-low’distributionofb-valuesintheoffshoreNanaoIslandandtheYangjiangareamayindicatetheanomalyofthecrustalstructurewithaweaklayer.Theb-valuesofreservoir-inducedseismicityareobviouslylowerthanthatinducedbytectonism.Thisfindingindicatesthatthereservoirareaisgenerallyathighstressstateundertheconditionofhighporepressure.Weinferredthatlargeearthquakesmightbepronetooccurat10–12kmdepthintheoffshoreNanaoIsland,at12–15kmdepthintheYangjiangarea,andatthelowerpartoftheseismicactivityzoneintheHeyuanarea.Moreover,theupstreamareaoftheXinfengjiangreservoiristhemostlikelyareaoffuturelargeearthquakesintheHeyuanarea.

简介：TheRamanspectraofthenaturalendmembersofthegarnet-groupminerals,whichincludepyrope,almandineandspessariteofFe-Algarnetseriesandgrossularite,andraditeanduvaroviteofCa-Fegarnetseries,havebeenstrdied.MeasuredRamanspectraofthesemineralsarereasonablyandqualitativelyassignedtotheinternalmodes,translationalandrotatorymodesofSiO4tetrahedra,aswellasthetranslationalmotionofbivalentcationsintheXsite.ThestretchandrotatoryA1gmodesfortheFe-AlgarnetseriesshowobviousRamanshiftsascomparedwiththosefortheCa-Fegarnetseries,owingtothecationsresidingintheXsiteconnectedwithSiO4tetrahedrabysharingthetwoedges.TheRamanshiftsofallmemberswithineitheroftheseriesareattributedmainlytothepropertiesofcationsintheXsitefortheFe-AlgarnetseriesandintheYsitefortheCa-Fegarnetseries.

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简介：在这篇文章，七个月周围的噪音数据和10个事件从Ningxia在七个数字车站记录了()控制来源爆炸数据记录了由的地区性的地震网络和5500-t15暂时并且7个永久地震车站被用来测量基本模式瑞利波浪的分散曲线。学习区域与0.1杳慲散眠被划分成格子吗？

简介：TheresultsobtainedusingthegroupmodelofearthquakesgeneratedintectonicblocksarefurtherusedinthispapertoanalyzetherelationshipbetweentheMs≥7.0eventsinChinesemainlandandthemodulationandtriggeringfromtheearthtides.TheresearchshowsthattheMs7.0eventsinChinesemainlandhavebeensignificantlytriggeredbythetidalstress,especiallywithintheactiveperiodwithgroupstrongearthquakes.Inthequiescenceperiodofstrongearthquakes,noMs7.0eventsweretriggered,whilewithintheactiveperiod,over82.4%ofstrongearthquakestookplacewithinaspecialmoonphase,whichis36.4%higherthantheaverage.Therefore,themodulationandtriggeringoftidalstresscanbeusedtodistinguishtheactiveperiodsandtoforecastthetimeofthestrongearthquakeswithintheactiveperiod.Therelationshipbetweenthetidaltriggeringandthetectonicdynamicconditionisinvestigatedandthemechanismofthemodulationissimulatedwiththegroupmodelofearthquakesgeneratedintectonicblocks.

简介：Basedonthe1stordercnoidalwavetheory,thewavediffractionaroundthepiergroupinshallowwaterisstudiedinthispaper.Theformulasforcalculatingthenonlinearwaveforcesarealsopresentedhere.Inordertoverifythetheoreticalresults,modeltestsareconductedinthewaveflumeinTheStateKeyLaboratoryofCoastalandOffshoreEngineeringlocatedinDalianUniversityofTechnology.TherangeofthewaveparametersintheexperimentsischaracteristicwaveperiodTg/d1/2=8.08-22.86,characteristicwaveheightH/d=0.10.45.Theresultsobtainedfromtheexperimentsagreewiththetheoreticalresultsquitewell.Itisshownthat,inshallowwaterthenonlinearwaveforcesactingonapiergrouparegreaterthanthosecalculatedbylinearwavetheory,thevalueofincrementinwaveforceincreaseswiththeincreasesofthenonlinearityofthewave.Inthewaverangestudiedinthispaper,thenonlinearwaveforcecanreachover4timestheforcecalculatecdbylinearwavetheory.Thus,itissuggestedthat,whenTg/d1/2>8,thewaveforceonthepiersinthepiergroupinshallowwatershouldbecalculatedbyusingthecnoidalwavetheory.

简介：Thispaperanalyzestheadvantagesanddisadvantagesoftwotechni-callinesforautomaticgroupgeneralizationofcontourlines.Theauthorsuggeststhatitispossibletogetfasterandbettergeneralizationresultsifwesimulatetheintelligenceofhumanexpertsinprogramdesigning,retrievegeomorphologicalstructuralinformationusingtheinputdataof2-Dcontourlinesandderiveandoutputthegeneralied2-Dresultsdirectly.

简介：我们是否用声学的记载的工具测量阶段或组速度，仍然被说服。在这份报纸，三种模型被用来由理论分析和数字模拟调查这个问题。首先，我们使用与不同速度包含二个飞机波浪的飞机波浪重叠模型并且能改变阶段速度和组速度的价值。数字结果看那阶段速度是否比组速度更高或低，用缓慢时间连贯(STC)我们能仅仅给阶段速度的方法。根据分散分析和分支切割集成的结果，当组速度由到达时间拣获得了时，第二在僵硬边界地上凿穿为分散曲线的结果和STC方法获得的速度是阶段速度的一阶的模式表演的波形建模。最后，偶极子登录一个慢形成模型用分散分析和真实轴的集成被调查。分散曲线和完整的波浪火车的结果与僵硬边界条件作为地上凿穿模型显示出类似的结论。

简介：TheWorkingGrouponInternationalBorders---GeoenvironmentalConcerns(IBC)wasestablishedinlate2003andoperatesundertheauspicesofTheIUGSCommissiononGeologicalSciencesforEnvironmentalPlanning(COGEOENVIRONMENT).Thefollowingisabriefreportofthefirstyear'sactivitiesoftheIBCduring2003.

简介：一个一般神经网络基于代替结构的computationally集中的地点特定的地震分析的潜力在这份报纸被建议了的方法论。方法论的基本框架由组成一feed有一隐藏的层的神经网络算法完成代表一个区域和土壤扩大的地震潜力的前面的背繁殖。方法论在印度与相应于德里城市的参数被实现并且验证。为这个目的，充分的理由运动由于考虑从喜玛拉雅的带的中央地震差距发源用的地震在德里为一个选择地点在基岩水平被产生必要象geotechnical数据一样地质。表面水平地面运动和相应地点特定的反应系列被使用一个一个维的相等的线性波浪繁殖模型获得。光谱加速值被看作一个目标参数验证方法论的性能。执行验证建议方法论的数字研究证明错误在预言光谱加速价值在为设计目的可接受的限制以内。方法论在它能被用于另外的地震地脆弱的区域并且能被包括取决于的更多的参数也更新的意义是一般的在这个题目最先进。

简介：Settlingvelocityisafundamentalparameterinsedimenttransportdynamics.ForuniformPar-ticles,thereareabundantformulasforcalculationoftheirsettlingvelocities.Butinnaturalfields,sedi-mentconsistsofnon-uniformparticles.Theinteractionamongparticlesiscomplexandshouldnotbeneg-lected.Inthispaper,basedontheanalysisofsettlingmechanismofnon-cohesiveandnon-uniformparti-cles,atheoreticalmodeltodescribesettlingmechanismisproposed.Besidessuspensionconcentrationandupwardturbulentflowcausedbyotherparticles,collisionamongparticlesisanothermainfactorinflu-encingsettlingvelocity.Byintroducingthecollisiontheory,equationsoffallvelocitybeforecollision,colli-sionprobability,andfallvelocityaftercollisionareestablished.Finally,aformulausedtocalculatetheset-tlingvelocityofnon-cohesiveparticleswithwidegraingradationispresented,whichagreeswellwiththeexperimentaldata.

简介：Inthiswork,wefocusonassessingthegroupeffectoflocalizedcorrosionontheultimatestrengthofthemarinestructuralplatesandstudytheload-deformationbehaviorsofplatesofvariousslendernessanduniaxialcompression.Meanwhile,weinvestigatedifferentcorrodedpatternsfromasinglecircularpitto25circularpitsdistributedovertheplateandcarryouthundredsofnonlinearfiniteelementsimulationsbycombiningthenumber,depth,distributionofpitswithimperfectionsandslendernessofplate.Thedistributionofmultiplepitscausesscatteringofstressconcentrationontheplate,thentheplasticsectionofplatechangeswithwiderdistributionofdamagesimultaneously.Theultimatestrengthariseswhenun-loadingzonecomprisedoftheyieldingstripsandholesextendsacrosstheplate.Itcanbeconcludedthatthecorrodedconditiondefinedasgroupeffectofpitsmanipulatesthedeformationstateandtheloadingcapacityofplateattheultimatestrengthmodethatcoincideswiththeproportionofeffectiveloadingareaandsectionintheprocessofpost-buckling.Tovalidatetheeffectofpitsgroup,weperformthenumericalexperimentsofthepost-bucklingofsteelplatescontainingpitsinarowwithdifferentorientation.

简介：SpatialscanningisdonefortworegionsinChineseMainland,wheredisplayedadenseprecursorynetworkduring1994～1998.Thetworegionsarethemid-southernsegmentoftheNorth-southseismicbelt(20°～35°N,95°～110°E)andNorthChina(36°～42°N,110°～120°E).Wetook0.5°×0.5°asaspatialwindowwithastepof0.25°and4monthsasatemporalwindowwithastepof1month.Forthetworegions,theanomalydensityisscannedfrom1994and1995respectivelyinthetworegions.TheprecursoryanomaliesareallfromtheDivisionofSeismicTrendinChinaandtheDivisionofSeismicTrendintheCapitalArea,CenterforAnalysisandPrediction,ChinaSeismologicalBureau.Aseismogenictectonicmodelisintroducedtoexplainthescanningresults.Inthemodel,thefrictionalstrengthofthefocalsourcesisdistributedrandomly.Aftertheboundaryplatemotionrateandallothergeologicalparametersaregiven,thestressofthesourcesinthesystemchangesinhomogenouslyduetothevariationofthefrictionalstreng

简介：NumericalexperimentsofadjointvariationalassimilationhavebeenperformedusingtheknownLorenzsystem.Withtheincreaseofsensitivityofmodel’sinitialvalues,itismoreandmoredifficulttousetheadjointmethodtogettheinitialvalueswhichareconsistentwiththedynamicsofthefore-castmodel.Undersomecircumstancesthealgorithmcompletelyfails.Thisshowsthatfour-dimen-sionalassimilationisrelatedtothelimitofpredictability.Ontheotherhand.withtheincreaseofmodelequation’serror,theresultofvariationalassimilationmaybecomeworseandworsesothatthepredictionhasnomeaning.Butifthemodelparametersarecorrectedwhenvariationalassimilationismade,theforecastresultscanbegreatlyimprovedbasedonLorenzmodel.

简介：Threemethodsofextractingtheinformationofanomaliesofaprecursorygroupareputforward,i.e.,themathematicalanalysesofthesyntheticinformationofearthquakeprecursors(S),theinhomogeneousdegreeofprecursorygroups(ID)andthevaluesofshort-termandimpendinganomalyinnear-sourcearea(NS).Usingthesemethods,wecalculatetheobservationaldataofdeformation,undergroundfluidandhydrochemicalconstituentsobtainedfromdifferentseismicstationsintheSichuan-YunnanregionandconcludethatthesyntheticprecursoryanomaliesofasinglestrongearthquakewithMs6.0differgreatlyfromthoseofthegroupedstrongearthquakes,fortheanomalousinformationofprecursorygroupsaremoreabundant.ThethreemethodsofextractingthesyntheticprecursoryanomalyandtherelatednumericalresultscanbeappliedintothepracticeofpredictiontothegroupedstrongearthquakesintheSichuan-Yunnanregion.Inhomogeneousdegree(ID)ofsyntheticprecursoryanomalycanbeidentifiedautomaticallybecauseittakesthethresholdofdistributivecharacteristicsoftheanomaliesofprecursorygroupasitscriterionforanomaly.

简介：Pseudopleuronectesyokamae(Günther)isoneofthemostimportanteconomicfishspeciesinthegenuslivingspeciallyinthenorthwestPacific,andisdistributedinthesouthernareaofthefareastseaofRussia,Japan,Korea,theHuanghaiSea,theBohaiSeaandthenorthernareaoftheEastChinaSea.Usuallytheyliveinnearshorewatersoftheseareasasgeographicsubpopulations.P.yokamaeintheSheathBaybelongstoalocalgroupoftheHuanghai-BohaiSeasubpopulationandisdistributedinthemouthandadjacentwatersofthebayalltheyearround,andthecatchofitsspawninggrouphas

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简介：Lomagundi-Jatuli事件(LJE)是保存13C在在世界范围的Paleoproterozoic碳酸盐的+5和+16之间的carb价值。然而，这些旅行的持续时间，振幅和模式仍然保持糟糕抑制了。在北方中国Craton的2.14-1.83GaHutuo组是一>10km厚火山--沉积顺序，包括>5km在在上被扔的厚保存得很好的碳酸盐--对亚tidal环境潮汐。碳酸盐的152件最不改变的样品的公司同位素、元素的分析揭示了三阶段的13C进化。它以只积极的13Ccarb(+1.3到+3.4)在Dashiling和Qingshicun形成在~上演2.1Ga碳酸盐，从积极价值由转变列在后面到震荡在~的积极、否定的价值3000mWenshan，Hebiancun，Jianancun，和Daguandong形成的厚碳酸盐，并且与只否定的13C保存在的carb价值>500mHuaiyincun和Beidaxing形成的厚dolostones。看来许多LJE，特别地那些极其积极的13Ccarb信号，没在Hutuo碳酸盐被记录。只积极的13Ccarb价值(+1.3到+3.4)多半在更低的形成保存了对应于LJE的目的，而随后二个阶段反映LJE和Shunga-Francevillian事件(SFE)的发作的余殃。现在的数据点到碳上的氧的增加的影响从Doucun骑车到Dongye亚群并且证明在北方中国Craton的LJE的结束与在Fennoscandia和南非的那些是将近同时的。