简介：Determinationofsedimentstabilityinthefieldischallengingbecausebedshearstress(BSS),adeterminingfactorofsedimenterosion,can’teasilybedirectlymeasured.Totacklethischallengeandreliablyassesssedimenterodibilityinafastflowingriver,astandaloneunderwatercamerasystemandanewinsituflume(ISF)weredevelopedandappliedinthisstudy.ThecamerasystemwasusedtorecordsedimentmovementandthenewISFwasusedformeasuringcriticalbottomshearstress(CBSS).Thecameracanbedeployedaloneinwatertorecordvideosortakepictureswithlightemittingdiode(LED)lightingandflexibleschedulesettings.TheISFisbasedontheconceptthattheamountofforceneededtoerodethesameparticleunderdifferentflowconditionsshouldbesimilar.TwohighresolutionAcousticDopplerCurrentProfilers(ADCP)alsoweredeployedinthefieldtocollectvelocity-depthprofileswhichareusedbyconventionalmethodstocalculateBSSwiththelawofthewall.ThesedimenterodibilitywasthenassessedbasedonthecomparisonbetweentheobtainedCBSSandBSSandthenfurtherverifiedwiththerecordedobservationsfromthedeployedcamera.Theresultsrevealthatthewidelyusedconventionalmethodcanproducelargeuncertaintiesandisnotadequatetoprovidemeaningfulconclusionundertheseconditions.

简介：MrJenkinslivesinatown.Heworksina1.Therearealotofoldwonderfulthingsinit.Helikeshisworkandoftengoestohisofficeontime.

简介：Chinaplanstobuildanexperimentalfastneutronbreedingreactorby2000tolayasolidtechnologicalfoundationfortheconstructionofcommercialfastneutronreactors.Thepreliminarydesignsforthefacilityareexpectedtobecompletedbytheendofthisyear.Thefacility,tobeownedbytheChineseAcademyofNuclearEnergy,willhaveadesignedthermalpowerof65MWandanelectricitygeneratingoutputof20MW.Developmentoffastneutronreactorsis

简介：Inthispaper,animagedynamiclightscatteringmethodfornanoparticlesizingisintroduced.ThespatialdistributionofthescatteredlightsfromnanoparticlesundergoingBrownianmotionwascapturedatahighframeratebyadigitalcamerawithinonesecond,whichisconsiderablyfasterthantheconventionalphotoncorrelationspectroscopymethod.Thecapturedseriesofphotographsweremeshedintothousandsofsmallunitsforcalculatingtheintensityautocorrelationfunctionsinparallel.Experimentalresultsfromthemeasurementsofthreereferencenanoparticlesamples(27,80,and352nmindiameters)demonstratedthefeasibilityofthismethod.

简介：2016年9月25日，一口名为FAST的超级“大锅”，在历经22年的漫长时光后，终于克服资金和技术上的重重困难，在贵州平塘的喀斯特洼坑里安家落户——这无疑是本年度天文学界的一桩大事。

简介：介绍了FAST公司研制推广使用的企业搜索技术、相关搜索技术及其在不同企业的应用。FASTESP向用户安全提供了结构、非结构与多媒体数据检索点，为新的智能检索建立新的标准。所配置的上下文识别搜索、可测量性和问题解决方案的超级性能极大地改变着公司从事贸易的活动方式，同时也改变了用户的搜索信息方式。

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简介：Consideringtheproblemofmoderanksrevealingofd-dimensionalarray(tensor)givenincanonicalform,weproposefastalgorithmbasedoncrossapproximationofGrammatricesofunfoldings.

简介：摘要： “FAST”是我国自主研发的探测系统，对我国科研方面研究有着重要意义。本文主要研究FAST系统的工作抛物面的确立以及变化原理。对FSAT系统中的主动反射面的形状调节进行探究，通过对节点位置的研究，找到能使系统达到接收天体电磁波最佳效果的理想抛物面，使用最小二乘法曲面拟合模型进行求解验证，并在此基础上进行改进优化，调整成最优模型。首先，运用MATLAB中Scatter工具包画出符合条件的三维散点图，发现主索节点呈椭圆抛物面，建立二次多项式，使用最小二乘法模型推广为三维模型，进行二元二次多项式拟合，参数a0、a1、a2、a3分别为0.0019、0.0019、0、-301.6714，因此求得理想抛物面为 。

简介：油量表是一种测定油箱内油量多少的仪表,在交通工具中有着极其广泛的应用.在人教版物理九年级全一册第十六章第4节“变阻器”中,有一道习题涉及油量表,在历年的中考题中也经常涉及油量表.

简介：目的本文详细探讨了中、英文版MMPI量表的发展历史、内容、信度、效度、应用等问题，为MMPI作为测试工具进行人格分析、心理分析、心理治疗等提供理论和实践依据．方法收集国内外对MMPI量表所作的相关研究资料和试验结果进行对比、分析、归纳与整合。结果MMPI测试可信度高、效度一致，利于提高临床的治疗效果，国内外研究相吻合。结论MMPI量表在心理学研究、临床治疗等领域发挥着越来越重要的作用．

简介：在跨栏跑教学和训练中,每节课学生最关心的问题是:“这次课跨多高的栏架,跨多远的栏间距离?”的确,跨栏技术的好坏,与适宜的栏高及栏间距离密切相关。学生迫切需要掌握不同栏高及相适应的栏间距离、各步步长的准确数据。如何根据不同的栏高,选择适当的栏间距离,并科学合理地分配各步的步长呢?根据0.618“黄金分割率”(见本刊1999年第4期《“黄金分割率”与跨栏跑技术》一文),结合近年来的教学实践,测定和计算出8个不同的栏高;21个不同栏间距离的跨栏步、起跨点、下跨点及栏间3步各步的距

简介：Wereviewthepresentstatusandfutureprospectsoffastignition(FI)researchofthetheoreticalgroupattheIAPCM(InstituteofAppliedPhysicsandComputationalMathematics,Beijing)asapartoftheinertialconfinementfusionproject.SincetheapprovaloftheFIprojectattheIAPCM,wehavedevotedoureffortstoimprovingtheintegratedcodesforFIanddesigningadvancedtargetstogetherwiththeexperimentalgroup.RecentFIexperiments[K.U.Aklietal.,Phys.Rev.E86,065402(2012)]showedthatthepetawattlaserbeamenergywasnotefficientlyconvertedintothecompressedcorebecauseofthebeamdivergenceofrelativisticelectronbeams.Thecouplingefficiencycanbeimprovedinthreeways:(1)usingacone–wire-in-shelladvancedtargettoenhancethetransportefficiency,(2)usingexternalmagneticfieldstocollimatefastelectrons,and(3)reducingtheprepulselevelofthepetawattlaserbeam.TheintegratedcodesforFI,namedICFI,includingaradiationhydrodynamiccode,aparticle-in-cell(PIC)simulationcode,andahybridfluid–PICcode,havebeendevelopedtodesignthisadvancedtargetattheIAPCM.TheShenguang-IIupgradedlaserfacilityhasbeenconstructedforFIresearch;itconsistsofeightbeams(intotal24kJ/3ω,3ns)forimplosioncompression,andaheatinglaserbeam(0.5–1kJ,3–5ps)forgeneratingtherelativisticelectronbeam.AfullyintegratedFIexperimentisscheduledforthe2014project.

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简介：ThispaperdevelopsanewlowerboundmethodforPOMDPsthatapproximatestheupdateofabeliefbytheupdateofitsnon-zerostates.ItusestheunderlyingMDPtoexploretheoptimalreachablestatespacefrominitialbeliefandselectactionsduringvalueiterations,whichsignificantlyacceleratestheconvergencespeed.Also,analgorithmwhichcollectsandprunesbeliefpointsbasedontheupperandlowerboundsispresented,andexperimentalresultsshowthatitoutperformssomeofthestate-of-artpoint-basedalgorithms.

简介：Inthispaper,afastalgorithmforthediscretesinetransform(DST)ofaToeplitzmatrixoforderNisderived.OnlyO(NlogN)+O(M)timeisneededforthecomputationofMelements.TheauxiliarystoragerequirementisO(N).Anapplicationofthenewfastalgorithmisalsodiscussed.

简介：Theneutralgaspressurenearplasmaordivertorplatesisveryimportantfortheplasma-wallinteraction,whichdeterminetheoperationmodeofdivertomandconfinementperformancesofplasmaintokamaks.Thecommercialionizationgaugedoesnotworkinstrongmagneticfieldandnoisyenviromentencounteredintokamaks.Themeasuringerromofpressurecommercialionizationareverylargebythegaugemountedonthepumpingsystemorthroughalongpipetothevacuumvessel.Anewionizationgauge,

简介：(2)OtherMagneticMaterialsREGiantMagnetostrictiveMaterials(GMM)ResearchofGMMinChinastartedsince1980sbutdevelopedrapidly.Theproductscanbeproducedinbatchestoday.However,applicationofsuchmaterialsinapparatusislaggardthandevelopedcountries.GMMmaterialsaremainlyappliedinstepmotors,linearactuators,ultrasonicsystems,sonarsystems,valves,precisecontrols,activevibrationdampingetc.Itisestimatedthatthenear10yearswillbethefastdevelopingperiodofglobalGMMmarket.GlobalproductionofGMMmaterialsduring1989to2005islistedinTable3.

简介：纸介绍2D浅水模型基于为快似地球形状的transients的分析的二阶段的明确的表达发生在河morphodynamics的上下文。质量和动量保存原则独立为两个阶段被强加。模型自然地说明非平衡固体运输，自从两个即时改编假设也不任何东西落后方程被采用代表沉积动力学。建议模型的夸张特性被显示在流动条件上独立地被保存。从1D和2D测试用例的数字模拟的结果与文学相比试验性的数据并且与可得到的数字解决方案。

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