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简介：Wereportasimplesolution-processedmethodforthefabricationoflow-cost,flexibleopticallimitingmaterialsbasedongrapheneoxide(GO)impregnatedpolyvinylalcohol(PVA)sheets.SuchGO–PVAcompositesheetsdisplayhighlyefficientbroadbandopticallimitingactivitiesforfemtosecondlaserpulsesat400,800,and1400nmwithverylowlimitingthresholds.Femtosecondpump–probemeasurementresultsrevealedthatnonlinearabsorptionplayedanimportantrolefortheobservedopticallimitingactivities.Highflexibilityandefficientopticallimitingactivitiesofthesematerialsallowthesecompositesheetstobeattachedtononplanaropticalsensorsinordertoprotectthemfromlight-induceddamage.

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简介：ThepiezoelectriccompositescontaininghighlyorientedBaTiO3whiskersasactivephaseandPVDFasmatrixhavebeenpreparedbymicro-holeextrusionandorientationincarriedfibers.ThemorphologyoforientedBaTiO3whiskersandmicrostructureofthecompositeswereobservedbySEM.Asforitselectromechanicalproperties,itisfoundthatthedielectricconstant,piezoelectricconstantandremnantofpolarizationintheBaTiO3whisker-PVDFcompositeareconsiderablyhigherthanthatintheBaTiO3powders-PVDFcomposite,whilethelossfactorsfollowtheoppositetrend.FortheBaTiO3whisker-PVDFcomposite,thevaluesofε,d33andPrparalleltothewhiskerorientation(normalspecimen)aremuchhigherthanthatperpendiculartothewhiskerorientation(parallelspecimen).Thesignificanteffectsoftheconnectivepassagesofactivephaseonelectromechanicalpropertiesofthepiezoelectriccompositeshasalsobeeninvestigated.

简介：HighlyunderexpandedaxisymmetricjetwassimulatedusingtheRunge-KuttaDiscontinuousGalerkin(RKDG)finiteelementmethod,which,basedontwo-dimensionalconservationlaws,wasusedtosolvetheaxisymmetricEulerequations.Thecomputedresultsshowthatthecomplicatedflowfieldstructuresofinterest,includingshockwaves,slipstreamsandthetriplepointobservedinexperimentscouldbewellcapturedusingtheRKDGfiniteelementmethod.Moreover,comparisonsoftheMachdisklocationexhibitexcellentagreementsbetweenthecomputedresultsandexperimentalmeasurements,indicatingthatthismethodhashighcapabilityofcapturingshockswithoutnumericaloscillationandartificialviscosityoccurringnearthediscontinuouspoint.

简介：这篇文章介绍疲劳裂缝生长(FCG)新灼伤抵抗的高度稳定的贝它Ti40合金的行为。FCG率被分析。破裂表面和测试样品的方面表面被探索。结果证明那频率影响Ti40合金的裂开的行为。温度也在Ti40合金裂开起一个重要作用。在房间温度(25°C)，当频率增加时，裂开的率在低压力紧张因素(ΔK)的范围改变一些，当ΔK什么时候高，显著地变化时。在500°C，Ti40合金的裂开的率在裂开的所有功课期间显著地变化。频率也影响Ti40合金的微观结构模式。很多个第二等的裂缝出现在区域从在高ΔK的主要裂缝的超过200μm当频率是1Hz，而是仅仅一些时，当频率是10Hz时，第二等的裂缝存在。当频率是1Hz时，方面图象是破裂表面的主要图象。当时，当频率是10Hz时，可锻的有条纹或刻痕之状态占据大多数破裂表面的区域。

简介：AnovelHeckreactioncatalystconsistingofapalladium（Ⅱ）complexofmeso-tetra（phydroxyphenyl）porphyrin（MTP）andcross-linkedchloromethylatedpolystyrenemicrospheres（PMs）wassuccessfullypreparedviacovalentetherbondsbetweenthechloridegroupsinthePMsandthehydroxylgroupsinMTP.Thecatalystwascharacterizedusingscanningelectronmicroscopy,Fourier-transforminfraredspectroscopy,andinductivelycoupledplasmaatomicemissionspectroscopy（ICP-AES）.Thispolystyrene-supportedpalladium-complexwasanefficientheterogeneouscatalystforcross-couplingofaryliodideswithethylacrylate.ThereactionofiodobenzeneandethylacrylateunderN2at100℃andacatalystconcentrationof0.1%gaveagaschromatographyproductyieldof99.8%,whichismuchhigherthanthatachievedusingafreepalladium（Ⅱ）complexofMTPasthecatalyst（41.3%）.Thecatalystwasrecycleduptosixtimeswithoutsignificantlossofcatalyticactivity.Theseresultssuggestthattheimmobilizedpalladium（Ⅱ）-MTPcatalysthaspotentialapplicationsinsyntheticandindustrialchemistry.

简介：从激光的单音的精力充沛的电子横梁的自我注射和加速弄醒地加速器首先在高度相对论的政体被调查，用100TW班，27fs激光脉搏。有象一样高的精力的Quasi-monoenergetic捆得多的横梁多--百兆电子伏与显示自我开水道的形成和电子的自我注射进血浆的散布方面的排出物的同时的大小被观察醒来，叫作一个“水泡”。三维的particle-in-cell模拟与1.5GeV/cm的坡度证实了电子捆的多重自我注射进水泡和他们的横梁加速。

简介：人的pluripotent干细胞代表功能的胰腺的内分泌的系房间的潜在地无限的来源。这里，我们报导一条高度有效的途径导致人的胚胎的茎(ES)细胞和导致的pluripotent茎(iPS)在一个定义化学药品的文化系统区分进成熟生产胰岛素的细胞的细胞。这条途径获得的区分的人的ES房间由流动cytometry分析作为assayed包括了将近25%胰岛素积极的房间，它以比得上成年人的小岛的一种方式响应葡萄糖刺激释放了insulin/C-peptide。大多数这些生产胰岛素的房间共同表示成熟尾房间特定的标记象NKX6-1和PDX1那样，在vivo显示一个类似的基因表示模式到成年小岛尾房间。在这研究，我们也证明EGF便于PDX1积极的胰腺的祖先的扩大。而且，我们的协议也成功了高效地导致人的iPS房间区分进生产胰岛素的房间。因此，这个工作不仅提供一个新模型在vitro学习人的胰腺的专门化和成熟的机制，而且提高为糖尿病的处理利用病人特定的iPS房间的可能性。

简介：Nickel-basedcatalyst[N,N]NiBr2,inwhich[N,N]standsforN-(2,6-diisopropylphenyl)pyridine-2-carboxaldimine,showshighactivityforethylenepolymerizationinthepresenceoforganoaluminumcompoundsunderhighethylenepressuretoyieldpolyethylenecharacteristicoflowmolecularweightandhighlybranchedchains.Tolueneasthesolventismoreinfavorofcatalystactivity,highermolecularweightandbranchedchainsinpolyethylenestructureascomparedtohexanesolvent.

简介：重氢氰化物的高度激动的颤动的混乱动力学被二条独立途径探索：(1)Lyapunov分析基于为层次的古典阶段空间，并且(2)狄克逊剧降分析基于摆钟动力学和使量子化的层次的概念。结果证明在这二个算法之间有明显的关联。我们也建议剧降能为动态混乱的度作为一项质的措施被带的二附近的狄克逊之间的精力差别相互。

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简介：ZnOnanoconearrays(NCAs)decoratedwithblackTiO2nanoparticles(BTiO2NPs)wereuniformlyanchoredonthesurfaceofcarboncloth(CC)directlybyasimplyelectrochemicaldepositionmethod.ThusanovelB-TiO2NPs/ZnONCAs-CChierarchicalheterostructurewasformed.Itdisplayedsuperiorperformanceandachievedahigherphotocurrentover0.4mA·cm^-2beforetheonsetofthedarkcurrent,attributedtotheseparationofthephotogeneratedelectron-holepair.BasedontheB-TiO2NPs/ZnONCAs-CCheterostructure,thecatalystwasfabricatedforpromotingtheseparationofchargecarriers.Moreover,theintroductionofTi^3+andoxygenvacanciesonthesurfaceofTiO2NPsexpandedtheabsorptionbandedgeandenhancedtheelectricalconductivityaswellasthechargetransportationonthecatalyticsurface.ItindicatesthattheB-TiO2NPs/ZnONCAs-CCcompositeisbeneficialtotheimprovementofthephotoelectrochemical(PEC)activity.

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简介：Withtheadventofthebigdataera,theamountsofsamplingdataandthedimensionsofdatafeaturesarerapidlygrowing.Itishighlydesiredtoenablefastandefficientclusteringofunlabeledsamplesbasedonfeaturesimilarities.Asafundamentalprimitivefordataclustering,thek-meansoperationisreceivingincreasinglymoreattentionstoday.Toachievehighperformancek-meanscomputationsonmodernmulti-core/many-coresystems,weproposeamatrix-basedfusedframeworkthatcanachievehighperformancebyconductingcomputationsonadistancematrixandatthesametimecanimprovethememoryreusethroughthefusionofthedistance-matrixcomputationandthenearestcentroidsreduction.Weimplementandoptimizetheparallelk-meansalgorithmontheSW26010many-coreprocessor,whichisthemajorhorsepowerofSunwayTaihuLight.Inparticular,wedesignataskmappingstrategyforload-balancedtaskdistribution,adatasharingschemetoreducethememoryfootprintandaregisterblockingstrategytoincreasethedatalocality.Optimizationtechniquessuchasinstructionreorderinganddoublebufferingarefurtherappliedtoimprovethesustainedperformance.Discussionsonblock-sizetuningandperformancemodelingarealsopresented.Weshowbyexperimentsonbothrandomlygeneratedandreal-worlddatasetsthatourparallelimplementationofk-meansonSW26010cansustainadouble-precisionperformanceofover348.1Gflops,whichis46.9%ofthepeakperformanceand84%ofthetheoreticalperformanceupperboundonasinglecoregroup,andcanachieveanearlyidealscalabilitytothewholeSW26010processoroffourcoregroups.Performancecomparisonswiththepreviousstate-of-the-artonbothCPUandGPUarealsoprovidedtoshowthesuperiorityofouroptimizedk-meanskernel.

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简介：AhighlyefficientH1-Galerkinmixedfiniteelementmethod(MFEM)ispresentedwithlineartriangularelementfortheparabolicintegro-differentialequation.Firstly,somenewresultsabouttheintegralestimationandasymptoticexpansionsarestudied.Then,thesuperconvergenceoforderO(h2)forboththeoriginalvariableuinH1(π)normandthefluxp=uinH(div,π)normisderivedthroughtheinterpolationpostprocessingtechnique.Furthermore,withthehelpoftheasymptoticexpansionsandasuitableauxiliaryproblem,theextrapolationsolutionswithaccuracyO(h3)areobtainedfortheabovetwovariables.Finally,somenumericalresultsareprovidedtoconfirmvalidityofthetheoreticalanalysisandexcellentperformanceoftheproposedmethod.

简介：这份报纸为高度装载的接近音速的压缩机串联论述对流动分离的重新组织的冲击波的影响的详细数字调查。边界层吸(BLS)被用来控制冲击波的地点和力量，与在49%弦定位的把发成送气音的槽，在的地方只在前缘的冲击波的冲击点是下游的。数字模拟基于NUMECA，一个商业软件，在有第三顺序的空间精确性的以房间为中心的控制卷途径被用来解决3-D的地方在笛卡儿的坐标系统下面的平均Reynolds的海军司烧方程。几个结论能通过数字结果的观察被做。(1)在串联经过的多重冲击波在冲击波下游的吸表面上带了边界层的速度赤字，导致片的吸方面上的严重分开的流动，特别当前面冲击波比震动的其余部分强壮得多时。(2)有小集体流动率的BLS不能有效地改进边界层。来自串联前缘的倾斜的冲击波的冲击点是什么时候，放血了到由BLS的经过冲击波下游，边界层流动极大地被改进。然而，如果BLS集体流动率超过批评价值(1.2%)，冲击波下游的边界层将与吸表面分开。(3)在片中间跨度，压缩机片的空气动力学的表演作为BLS集体流动率增加被改进。最佳BLS是大约1.2%。与基线盒子相比，有1.2%的流动率的BLS增加全部的压力恢复系数12%，并且减少在18%的散开因素和到7的偏差角度吗？

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.