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15 个结果
  • 简介:thinkhighlyof意为“看重;对……评价很高”。【经典例句】

  • 标签: 评价 of 经典例句
  • 简介:Forthestabilityrequirementofnumericalresultants,themathematicaltheoryofclassicalmixedmethodsarerelativelycomplex.However,generalizedmixedmethodsareautomaticallystable,andtheirbuildingprocessissimpleandstraightforward.Inthispaper,basedontheseminalideaofthegeneralizedmixedmethods,asimple,stable,andhighlyaccurate8-nodenoncompatiblesymplecticelement(NCSE8)wasdevelopedbythecombinationofthemodifiedHellinger-Reissnermixedvariationalprincipleandtheminimumenergyprinciple.Toensuretheaccuracyofin-planestressresults,asimultaneousequationapproachwasalsosuggested.NumericalexperimentationshowsthattheaccuracyofstressresultsofNCSE8arenearlythesameasthatofdisplacementmethods,andtheyareingoodagreementwiththeexactsolutionswhenthemeshisrelativelyfine.NCSE8hasadvantagesoftheclearingconcept,easycalculationbyafiniteelementcomputerprogram,higheraccuracyandwideapplicabilityforvariouslinearelasticitycompressibleandnearlyincompressiblematerialproblems.ItispossiblethatNCSE8becomesevenmoreadvantageousforthefractureproblemsduetoitsbetteraccuracyofstresses.

  • 标签: Modified H-R MIXED variational principle Partial-mixed
  • 简介:Thehighpowerholeyfiberisanefficientsupercontinuumlightsourcebyusingpicosecondpulse,whichisalessexpensivelasersourcecomparedwithlowpowerandexpensivefemtosecondlasersources.Inthispaper,ahighpowerhighlynonlinearholeyfiber(HN-HF)withalowconfinementlossisproposedforsupercontinuumlightsources.ThefinitedifferencemethodisusedtocalculatethedifferentpropertiesoftheproposedHN-HF.Highnonlinearcoefficientsareobtainedat1.06μm,1.31μm,and1.55μmwavelengthswithflattenedchromaticdispersionandlowconfinementlossessimultaneously.Moreover,numericalsimulationresultsshowthathighpowerbroadsupercontinuumspectrawithveryshortlengthoftheproposedphotoniccrystalfiberareachieved.

  • 标签: CHROMATIC DISPERSION effective area holey fiber
  • 简介:在这份报纸,我们调查异构的多尺度的方法(唔)为有分布式的控制的最佳的控制问题,限制与高度摆动的系数由椭圆形的方程管理了。州的可变、有肋骨的变量被依靠联合的宏和微有限元素的多尺度的discretization计划接近,而控制变量是由piecewise常数的discretized。由把著名狮子词根用于discretized最佳的控制问题,我们获得必要、足够的optimality条件。在L2和H1标准的Apriori错误估计为状态被导出,有肋骨并且有制服的控制变量绑了常数。最后,数字例子被举说明我们的理论结果。

  • 标签: 控制问题 多尺度 椭圆形 管理 方程 摆动
  • 简介:DistributedBraggreflectors(DBRs)areessentialcomponentsforthedevelopmentofoptoelectronicdevices.Inthispaper,wefirstreporttheuseofthenanoporousGaN(NP-GaN)DBRasatemplateforregrowthofInGaN-basedlight-emittingdiodes(LEDs).Thewafer-scaleNP-GaNDBR,whichisfabricatedbyelectrochemicaletchinginaneutralsolution,hasasmoothsurface,highreflectivity(>99.5%),andwidespectralstopbandwidth(>70nm).ThechemicalcompositionoftheregrownLEDthinfilmissimilartothatofthereferenceLED,butthephotoluminescence(PL)lifetime,PLintensity,andelectroluminescenceintensityoftheLEDwiththeDBRareenhancedseveraltimescomparedtothoseofthereferenceLED.TheintensityenhancementisattributedtothelightreflectioneffectoftheNP-GaNDBRandimprovedcrystallinequalityasaresultoftheetchingscheme,whereastheenhancementofPLlifetimeisattributabletothelatter.

  • 标签: Distributed Bragg REFLECTORS (DBRs) InGaN-based LIGHT-EMITTING
  • 简介:Theyolk-shellFe3O4@Cnanocubesweresuccessfullysynthesizedthroughcarbothermicreductionprocessfromcarbon-coateda-Fe2O3precursor.Theresultsshowthattheyolk-shellFe3O4@Cnanocubesareuniformlycoatedwithathincarbonlayer,andaclearcavityabout150nminwidthbetweenFe3O4coreandcarbonshellareformedduetothevolumeshrinkageduringthereductiontreatment.Theobtainedyolk-shellFe3O4@Cnanocubesexhibitexcellentcyclingstability(thedischargecapacityis709.7mAh/gafter100cyclesatthecurrentdensityof0.1C)andrateperformance(1023.4mAh/gat0.1C,932.5mAh/gat0.2C,756.1mAh/gat0.5C,405.6mAh/gat1C,and332.3mAh/gat2C,andmoreimportantly,whenthecurrentdensityfinallybacksto0.1C,acapacityof776.8mAh/gcanberestored).Theoutstandinglithiumstoragepropertiesmaybeattributedtotheuniqueyolk-shellstructures.

  • 标签: Fe3O4 yolk-shell nanocube ANODE lithium STORAGE