简介:Grounddeformationmaybecausedbycrustalmovementandnon-crustalmovement.Thenon-crustalmovementsincludethosecausedbytemperature,rainfall,groundwater,etc.Deformationcausedbycrustalmovementincludesseismogenicdeformation(thatappearingintheprocessofearthquakepreparationandthatdirectlycausedbytheearthquake)andgeneraltectonicactivities.Thekeypointinthestudyoftherelationshipbetweengrounddeformationandearthquakesishowtoeliminateinformationofdeformationcausedbynon-crustalmovementandpermanent(orslow)tectonicdeformationinobserveddata.InthispaperananalysisismadeontheshortlevelingdatarecordedatDahuichangDeformation-ObservingStation,Beijing,for22years(1970-1991)byusingtheLMSalgorithmmethodafterlateraladaptivefilteringofthemoderndigitalsignalprocessingtechnique.Eliminatingtheapproximateannualvariationindeformationcausedbynon-crustalmovementsuchastemperature,rainfall,groundwater,etc.,aunifiedstandardis
简介:Onetypeofaerialcablewayconsistsofacontinuouscable,whichworksatthesametimeascarryingcableanddrawingcable.Thiskindofcablewayissupportedbymanytowers,whichdividethetotallengthinlinearsections.Evensmalldeviationsfromtheplanedlayoutcanincreasethestrainofthecableandthedangerofderailments.Thedeviationsofthepositionofthetowersfromtheplanedlayoutareduetolocalslidingorsinkingofthefoundationorothermechanicalmovements.Uptonowtheaxisofthecablewayswereperiodicallymeasuredbytraditionalmethods.ThegoalofthisprojectistodemonstratethepossibilityofmeasuringtheaxisofacablewaywithGPStechniques,whilethecableismoving.Theresultsshowthattheproposedmeasuringdeviceprovidespreciseresultsinasimpleandreliableway.
简介:Theballoon-basedcathetersareattractivefortheminimallyinvasiveproceduresbecausethesecatheterscanbeconfiguredtomatchrequirementsonsizeandshapefortheinteractionwiththesofttissue.Ananalyticalmechanicmodelisdevelopedforthedeformedballoontodeterminetheshapeoftheinflatedcatheter.Thebridgesalonglatitudinaldirectionshouldbehighstretchableduetothehighelongationalongthelatitudeoftheinflatablecatheter.Theseresultsagreewellwiththefiniteelementmethodwithoutanyparameterfitting.
简介:Whethertheconceptofeffectivestressandstraininelastic-plastictheoryisstillvalidundertheconditionoffinitedeformationwasmainlydiscussed.Theuni-axialcompressionexperimentsinplanestressandplanestrainstateswerechosenforstudy.Inthetwokindsofstressstates,thestress-straincurvedescribedbylogarithmstrainandrotatedKirchhoffstressmatchestheexperimentsdatabetterthanthecurvesdefinedbyotherstressstraindescription.
简介:Thissurveyreviewstherecentdevelopmentofgradientdomainmeshdeformationmethod.Differenttootherdeformationmethods,thegradientdomaindeformationmethodisasurface-based,variationaloptimizationmethod.Itdirectlyencodesthegeometricdetailsindifferentialcoordinates,whicharealsocalledLaplaciancoordinatesinliterature.BypreservingtheLaplaciancoordinates,themeshdetailscanbewellpreservedduringdeformation.DuetothelocalityoftheLaplaciancoordinates,thevariationaloptimizationproblemcanbecastedintoasparselinearsystem.Fastsparselinearsolvercanbeadoptedtogeneratedeformationresultinteractively,oreveninreal-time.Thenonlinearnatureofgradientdomainmeshdeformationleadstothedevelopmentoftwocategoriesofdeformationmethods:linearizationmethodsandnonlinearoptimizationmethods.Basically,thelinearizationmethodsonlyneedtosolvethelinearleast-squaressystemonce.Theyarefast,easytounderstandandcontrol,whilethedeformationresultmightbesuboptimal.Nonlinearoptimizationmethodscanreachoptimalsolutionofdeformationenergyfunctionbyiterativeupdating.Sincethecomputationofnonlinearmethodsisexpensive,reduceddeformablemodelsshouldbeadoptedtoachieveinteractiveperformance.Thenonlinearoptimizationmethodsavoidtheuserburdentoinputtransformationatdeformationhandles,andtheycanbeextendedtoincorporatevariousnonlinearconstraints,likevolumeconstraint,skeletonconstraint,andsoon.Wereviewrepresentativemethodsandrelatedapproachesofeachcategorycomparativelyandhopetohelptheuserunderstandthemotivationbehindthealgorithms.Finally,wediscusstherelationbetweenphysicalsimulationandgradientdomainmeshdeformationtorevealwhyitcanachievephysicallyplausibledeformationresult.
简介:Itisachallengingproblemofsurface-baseddeformationtoavoidapparentvolumetricdistortionsaroundlargelydeformedareas.Inthispaper,weproposeanewrigidityconstraintforgradientdomainmeshdeformationtoaddressthisproblem.Intuitivelytheproposedconstraintcanberegardedasseveralsmallcubesdefinedbythemeshverticesthroughmeanvaluecoordinates.Theuserinteractivelyspecifiesthecubesintheregionswhicharepronetovolumetricdistortions,andtherigidityconstraintscouldmakethemeshbehavelikeasolidobjectduringdeformation.Theexperimentalresultsdemonstratethatourconstraintisintuitive,easytouseandveryeffective.
简介:Greatearthquakesoftenoccuralongornearactivefaultbelts.Thus,monitoringandresearchonfaultdeformationarequiteimportant.Methodssuchasshort-leveling,shortbaselineandintegratedmonitoringprofileacrossfaultbeltshavebeenusedtomonitorfaultactivitiesformanyyears.GNSSobservationsaremainlyusedtoobtainthehorizontalvelocityfieldinlargeareasandtostudytheactivitiesanddeformationofmajorblocks.GNSStechnologyhasbeenusedtomonitorandstudythedeformationoffaultsfromadifferentaspects.Inthispaper,someapplicationsandnewexplorationsofGNSSarediscussed.Theyare:(1)Researchandmonitoringofstrike-slipactivitiesoffaultswithGNSS.(2)ResearchandmonitoringofverticalactivitiesoffaultswithGNSS.(3)Investigatingthelawsofdeformationofblocksonthesidesoffaultzoneandsettingupstrainmodelstodeducetheactivitiesanddeformationoffaultswithrespectivemodelsandcomparethededucedresultswiththeactualmeasurementsacrossfault.Itisconcludedthatalargerdiscrepancybetweenthededucedandtheobserveddeformationindicatesastrongerinteractionbetweentheblocks,whichcanbeimportantforpredictingthelocationofastrongearthquakeandassessingseismichazard,aswellastheseismicitytrend.
简介:Thenaturalgabbrosamplesweredeformedattemperaturerangingfrom700to1150°Cwithstrainratestepsof1910-4,2.5910-5,6.3910-6s-1.Themechanicaldatashowthatsampleexperiencesgradualtransitionfromsemi-brittleflowtoplasticflow,correspondingtoasystematicallydecreasingstressexponentnwiththeincreasingtemperaturerangingfrom16.5to4.1(Heetal.SciChina(D)46(7):730–742,2003).Weinvestigatemicrostructuresanddeformationmechanismsofexperimentallydeformedgabbroundertransmissionelectronmicroscopeinthisstudy.Forlowtemperatureof700°Cto950°C,thedeformationismainlyaccommodatedwithdislocationglideandmechanicaltwinning,correspondingtostressexponentlagerthan5,whichmeanssemi-brittledeformation.Whereaswithhighertemperatureupto1000°C–1150°C,thedeformationisaccommodatedmainlywithdislocationglideandclimbcorrespondingtostressexponentof4.1,whichmeansplasticdeformation.Evidenceofdislocationclimbhasbeenfoundasdislocationwallsinplagioclase.Theobservedslipsysteminplagioclaseis(001)1/2[110]andthatinclinopyroxeneare(100)[001]and(010)[001].The(010)[001]slipsysteminclinopyroxeneisnewlyfoundinthiswork.Meltwasfoundattemperatureof950°C–1050°C.Themeltglassdistributedbothinmeltthinfilmbetweentwograinboundariesandmelttubulesoftriangularalongthreegrainboundariesattemperatureof950°C–1000°C.Themelttriangularinterconnectedtothemeltfilmattemperatureof1050°C–1150°C,wherethemeltchemicalcompositiondifferentiatedintoiron-richdarkdotsandsilicate-richmatrix.
简介:试用被坝所围住的水从2008年9月27日在三座峡水库被继续。在Hefeng有强壮的变丑和失败()山崩当水库水水平从173m的高度下降了时。它显示变丑是仔细与水库水变化有关。为这个原因,在变丑的水库水的效果被学习,拿象在这篇文章的一个例子的Hefeng山崩。首先,强壮的变丑区域的地质的特征和变丑状况被分析透露内在的因素和在水的条件下面的变丑的模式铺平变化。第二,山崩的稳定性在升起并且下降的过程,和在水库水水平变化和山崩变丑之间的相应关系期间被计算进一步被识别。最后,渗出物领域和在井的线下面的山崩身体的力量条件被分析揭示水库水的效果。而且,为更好可渗透的水库山崩,在水库水升起期间,渗出物力量的有利效果削弱相反的效果,这能被结束高举强迫水库水升起稳定性上的小效果,和没有变丑被引起了;但是在下降水库期间流水,渗出物力量的相反的效果在uplift力量的相反的效果上被附加,它引起稳定性戏剧性地减少并且在山崩前面导致累积身体的失败。
简介:Areal-valuedfunctionf(x)onЖbelongstoZygmundclassA.(Ж)ffitsZygmundnorm‖f‖x=inf,|f(x+t)-2f(x)+f(x-t)/t|isfinite.Itisprovedthatwhenf∈A*(Ж),thereexistsanextensionF(z)offtoH={Imz>0}suchthat‖Э^-F‖∞≤√—1+53^2/72‖f‖z.Itisalsoprovedthatiff(0)=f(1)=0,thenmax,x∈[0,1]|f(x)|≤1/3‖f‖x.
简介:ThispaperconstructsaclassofHarish-Chandramoduleswithmultiplicity<-1ofthetwoparameterdeformationofVirasoroalgebraandprovesaclassificationtheorem.
简介:包括热扩大的痊愈动力学,痊愈收缩,和系数的Prepreg性质被分析。一个模拟方法基于元素出生和有限元素分析(FEA)的死亡方法被介绍模仿切的过程并且预言用机器制造的变丑为合成把压成薄片并且使硬的面板。在模拟结果和试验性的数据之间的比较显示出好同意。剩余压力是为composites用机器制造变丑的主要来源,仅当沿着用机器制造的方向有压力坡度,用机器制造变丑被期望发生,这被发现。为没有用机器制造的变丑合成在飞机由于它的一致压力分发把压成薄片,当用机器制造时,变丑能为T形状显然被观察使硬的合成面板。注意应该对用机器制造变丑在汇编期间避免失配被给予。
简介:Puretungsten(PW)andW-1wt%La2O3(WL10)werepreparedbypowdermetallurgicalroutefollowedbytheswaging+rollingprocess.Thelogarithmicstrainsare0,0.37,0.58,and0.98forWL10and0,0.58forPW.Heattreatmentswereperformedattemperaturesvariedfrom1,573to2,173Ktodeterminetherecrystallizationtemperature.Recrystallizationtemperaturesare1,973and2,173KforWL1(logarithmicstrainof0.37)andWL3(logarithmicstrainof0.98),respectively.ButinthecaseofWL2(logarithmicstrainof0.58),fullrecrystallizationisnotachievedattemperatureofabove2,173K.Furthermore,therecrystallizationtemperatureofPWwithlogarithmicstrainof0.58isatleast300KlowerthanthatoftheequivalentWL10sample.Moreover,theincreaseofrecrystallizationtemperatureinhibitsthestrengthdegradationofWL2:sampleslose4%and22%strengthwhenannealedat1,573and1,973Kcomparedwithroomtemperature(RT)sample.Finally,thetextureevolutionfortheswaged+rolledWL10issignificantlyrelatedtothedeformationdegree:thedominatedorientationis<001>forWL2while<110>forWL3.
简介:在变丑和垂直涡度趋势之间的一种数学关系被介绍frontogenesis功能和完全的垂直涡度方程造,它被潮湿的潜在的涡度的优点导出。从数学关系,适当地设置了大气的条件,这被显示出能让变丑以比得上另外的有利因素的率施加积极贡献到旋涡开发。在旋涡开发的变丑的效果自己与变丑有关不仅,而且取决于空气的当前的热力学、动态的结构潮湿的baroclinicity和垂直的风例如对流稳定性,砍(或水平涡度)。发生在20222012年7月期间的重降雨的格的诊断研究证明那变丑在它的整个生命周期期间在低旋涡的快速的发展阶段期间在垂直涡度的增加以后有最显著的效果。这个特征在对流稳定性趋于是零的空气主要由于近似的中立的层(大约700hPa)的存在。中立的层在旋涡发展阶段期间显著地在垂直涡度增加以后做变丑的效果,并且因此驱使垂直涡度增加。