简介：Thegeometricshapesofspecimensareimportantinimpacttensiletestsbecausegeometricshapesdeterminethestressstatesofthespecimens,andprecisegeometricshapescanobtainpropermaterialpropertieswithoutnon-materialfactors.Theaimofthisstudywastoinvestigatethe1Dformofthestressbychangingthelength-to-diameter(L/D)ratiosofspecimens.TheexperimentswerecarriedoutonasplitHopkinsontensilebar(SHTB)-rotatingdiskindirectbar-bartensileimpactapparatus.TheL/DratiosoftheLY12CZspecimensusedinthetestrangedfrom1to5.ResultsshowthatthespecimenscanbeusedtoobtainexactparametersofmaterialsundertheproposedconditionswhentheL/Dratioisgreaterthan2.Thisisbecausethelongerlengthwillreduceoreliminatetheeffectsoftheinterfaces.

简介：三个最佳的线性态度评估者用一条几何途径为太空船态度的单个点的即时评价被建议。最后的最佳的态度被修改Rodrigues参数(MRP)代表。在为每测量价值介绍偶然的右边的直角的坐标以后，三错误向量被点或/并且生气产品的使用获得。相应optimality标准严厉地二次、非强迫，它不与Wahbas与抑制标准一致。奇特，当主要角度接近时，发生，能被一合适的旋转容易避免。数字模拟证明建议三个最佳的线性评估者能提供与遵循Wahbaoptimality定义的那些可比较的精确，并且比著名四元数评估者(探索)有更快的计算速度。

简介：TheeccentricityofthecentreofmassfromthegeometriccentreofasphericalattractingmassindeterminingtheNewtoniangravitationalconstantGistestedbymeansofanelectronicbalance.Theexperimentalresultshowsthattheeccentricityofthesampleisabout0.31μmwithuncertaintyof0.05μm.TwodensitydistributionmodelsarediscussedtoestimatetheuncertaintytoGbytheeccentricitiesoftheattractingmasses.

简介：Basedontheanalysisofuniformsamplingtheorem,thispaperpresentedtheuniformdeterministicdiscretemethod(UDDM)forcomputingthediffuseradiationviewfactorsincomplexgeometricalsys-tems.Theaccuracy,speedandconvergencearediscussedorcomparedwiththatofMonteCarloMethod(MCM)inordertodemonstratetheadvantagesofUDDM.

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简介：二部件的CamassaHolm和HunterSaxton系统是，这被显示出几何上integrable，也就是，他们描述伪spherical表面。作为后果，他们能量守恒定律的无限的数字直接被构造。另外，取决于伪潜力的非局部的对称的一个班被获得。

简介：Withtheincreasingnumberoflaserbeams,themaindifficultyinarrangingbeamguidingsystems(BGSs)involvesdeterminingthecorrespondingrelationshipsbetweentheoutputandinputportstorealizetheidentifiedlightpathlengthofallbeams.Giventhebasicconstraintsofgeometricarrangement,aBGSmodelisestablished,andabase-linealgorithmisproposedtoaddressthedifficultymentionedabove.Boundaryconditionsoftargetareaandtargetchamberarediscussedtoincreasethenumberoflaserbeams,andamaximumvalueexistsforaspecifictargetarea.Finally,thecompatibilityofacylindricalhohlraumtargetchamberwithasphericalhohlraumisanalyzed,andamoveablefinalopticsassemblyisproposedtoexecutetheswitchbetweenthetwodifferenttargets.

简介：Basedonsqueezedoperatorsthispaperhasimplementedanidealunconventionalgeometricquantumgate(GQG)iniontrap-opticalcavitysystembyradiatingthetrappedionswiththecavityfieldoffrequencyωcandanexternallaserfieldoffrequencyωL.Itcanensurethatthegatetimeisshorterthanthecoherencetimeforqubitsandthedecaytimeoftheopticalcavitybyappropriatelytuningtheionictransitionfrequencyω0,thefrequenciesofthecavitymodeωcandthevibrationalmodeν.IthasalsorealizedtheunconventionalGQGundertheinfluenceofthecavitydecaybasedonthesqueezed-likeoperatorsandfoundthatthepresentschemeworkswellforthesmallercavitydecaybyinvestigatingthecorrespondingfidelityandsuccessprobability.

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简介：由不变的理论使用，我们学习与一块时间依赖者激光地交往的二精力级的Bose-Einsteincondensate，动态、几何的阶段aregiven分别地。Aharonov-Anandan阶段也在轮转的进化下面被获得。

简介：Generallyspeaking,mainflowpathofgasturbineisassumedtobeperfectforstandard3Dcomputation.Butinrealengine,theturbineannulusgeometryisnotcompletelysmoothforthepresenceoftheshroudandassociatedcavityneartheendwall.Besides,shroudleakageflowisoneofthedominantsourcesofsecondaryflowinturbomachinery,whichnotonlycausesadeteriorationofusefulworkbutalsoapenaltyonturbineefficiency.Ithasbeenfoundthatneglectshroudleakageflowmakesthecomputedvelocityprofilesandlossdistributionsignificantlydifferenttothosemeasured.Evenso,theinfluenceofshroudleakageflowisseldomtakenintoconsiderationduringtheroutineofturbinedesignduetoinsufficientunderstandingofitsimpactonendwallflowsandturbineperformance.Inordertoevaluatetheimpactoftipshroudgeometryonturbineperformance,a3Dcomputationalinvestigationfor1.5-stageturbinewithshroudedbladeswasperformedinthispaper.Thefollowinggeometryparameterswerevariedrespectively:-Inletcavitylengthandexitcavitylength,-Shroudoverhangupstreamoftherotorleadingedgeanddownstreamofthetrailingedge,-Shroudradialtipclearance,Theaimofthispaperistoisolatetheinfluenceofshroudandcavitygeometrymodificationsonturbineaerodynamicperformanceandtoobtaincleartrendsofefficiencychangescausedbydifferenttipshroudgeometry.Moreover,interactionbetweenleakageflowandmainstreamfordifferentshroudconfigurationisalsohighlightedinordertopenetrateintothephysicalmechanismsproducingthem.Duetothelimitationsofthemodelselectedinthispaper,theaimofresearchisnottoputforwardthedesignrulesofturbineshroud.However,theresultsobtainedfromthisworkwillbeusefultotheintegrateddesignandoptimizationofturbinewithshroudedblades.