简介:Inthisstudy,thenull-fieldboundaryintegralequationmethod(BIEM)andtheimagemethodareusedtosolvetheSHwavescatteringproblemcontainingsemi-circularcanyonsandcirculartunnels.Tofullyutilizetheanalyticalpropertyofcirculargeometry,thepolarcoordinatesareusedtoexpandtheclosed-formfundamentalsolutiontothedegeneratekernel,andtheFourierseriesisalsointroducedtorepresenttheboundarydensity.Bycollocatingboundarypointstomatchboundaryconditionontheboundary,alinearalgebraicsystemisconstructed.Theunknowncoefficientsinthealgebraicsystemcanbeeasilydetermined.Inthisway,asemi-analyticalapproachisdeveloped.Followingtheexperienceofnear-trappedmodesinwaterwaveproblemsofthefullplane,thefocusingphenomenonandnear-trappedmodesfortheSHwaveproblemofthehalf-planearesolved,sincethetwoproblemsobeythesamemathematicalmodel.Inthisstudy,itisfoundthattheSHwaveproblemcontainingtwosemi-circularcanyonsandacirculartunnelhasthenear-trappedmodeandthefocusingphenomenonforaspecialincidentangleandwavenumber.Inthissituation,theamplificationfactorfortheamplitudeofdisplacementisover300.
简介:聪明的边网络内容条款热点的出现,与巨大的存储空间被装备,,几GB),开创机会学习在边网络交付录像的可能性。与两个不同常规内容条款交货网络(CDN)并且对等(P2P)策划,这个新交货范例,也就是边录像CDN,要求在设法并列地要服务的用户家/办公室定位的多达百万个边热点活动录像内容条款。明确地,二挑战涉及造边录像CDN,包括边内容条款热点怎么应该被组织为用户服务,并且内容项目怎么应该在为用户服务的不同地点被复制到他们。探讨这些挑战,我们如下建议我们的数据驱动的设计。首先,我们提出一个边区域分区问题联合最大化用户经验丰富的质量并且最小化复制费用,它在自然是NP难的,并且我们设计一个象Voronoi一样分区算法产生最佳的服务房间。第二,满足条款热点复制内容项目到边网络,我们建议边请求预言基于复制策略,它在卸载举止的一座服务者山峰执行复制。我们实现我们的设计并且使用踪迹驱动的实验验证它的有效性。与常规集中的CDN和基于流行的复制相比,我们的设计能显著地改进经验的用户质量,以用户察觉了带宽和潜伏,直到40%。
简介:自从模仿波浪的风波浪模型,Nearshore(天鹅)不能有效地包括波浪高度在侧面的边界,变化特征和计算波浪因素的失真范围附近模仿波浪地,时期,方向,并且计算领域的侧面的边界附近的长度小心地分别地在不同的水深度和风速度的情况中被学习。水深度和风的变化的效果在侧面的边界附近在建模的不同波浪因素上加速的计算结果表演是不同的。在某个风速度的情况中,水深度越大,失真范围是越多greater。在某个水深度的情况中,波浪高度,时期,和长度的相对错误定义的失真范围与相应波浪因素的绝对错误定义的那些不同。而且,相对错误减少随风的增加定义的失真范围加速;而绝对错误定义的失真范围随着风速度的变化有点变化。有风速度的增加的波浪方向减少的失真范围。与SWAN一起的侧面的边界附近的计算波浪因素在实际物理区域当模特儿,例如在这研究考虑的泰胡湖和达恩尚湖,如果计算领域没根据实际物理区域被扩大,确实被弄歪。因此,当天鹅被采用计算风波浪时,地接近海或内陆湖的海岸线,适当途径必须被采用减少计算错误。
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简介:由启用在大多数材料的机能上地相关的长度规模探查lightmatter相互作用,近地的光成像和光谱学存取与另外的方法是不能得到的信息。无孔的技术的来临,它利用ultralocalized并且提高近地由突然地金属性的尖端或plasmonicnanoparticles创造了,为学习新奇材料和现象导致了近地的途径的快速的采纳,与接近亚molecular层次的空间分辨率。然而,这些途径由无孔的尖端的主导的out-of-plane极化反应通常是有限的,限制许多材料性质的探索和发现。这在为与近地的轻部件提高在里面飞机相互作用明确地设计的近地的尖端导致了最近的设计和制造突破。这微型评论在针对利用的最近的进步和新兴的方向上提供一个观点,加亮在哪儿的关键应用程序空格并且控制在里面飞机光极化近地的尖端回答启用了的在里面飞机在新nanostructured材料和设备的理解和开发的最近的前进。
简介:Objective:Photoacoustic(PA)tomography(PAT)hasattractedextensiveinterestbecauseofitsopticalabsorptioncontrastandultrasonicdetection.ThisstudyaimstodevelopabiocompatibleandbiodegradablePAcontrastagentparticularlypromisingforclinicalapplicationsinhumanbody.Methods:Inthisstudy,wepresentedaPAcontrastagent:1,2-distearoyl-sn-glycero-3-phosphoethanolamine-N-[methoxy(polyethyleneglycol)](DSPE-PEG)-coatedsuperparamagneticironoxide(SPIO)nanoparticles(NPs)loadedwithindocyaninegreen(ICG).WeusedICGandSPIONPsbecausebothdrugsareapprovedbytheU.S.FoodandDrugAdministration.Giventhestrongabsorptionofnear-infraredlaserpulses,SPIO@DSPE-PEG/ICGNPswithauniformdiameterof~28nmcouldsignificantlyenhancePAsignals.Results:WedemonstratedthecontrastenhancementoftheseNPsinphantomandanimalexperiments,inwhichtheinvivocirculationtimeofSPIO@DSPE-PEG/ICGNPswasconsiderablylongerthanthatoffreeICG.ThesenovelNPsalsodisplayedahighefficiencyoftumortargeting.Conclusions:SPIO@DSPE-PEG/ICGNPsarepromisingPATcontrastagentsforclinicalapplications.
简介:Therelationshipbetweenthefactoroftemperaturedifferenceofthenear-surfacelayer(T1000hPa-T2m)andseafogisanalyzedusingtheNCEPreanalysiswithahorizontalresolutionofl°xl°(2000to2011)andthestationobservations(2010to2011).TheelementistreatedasthepredictionvariablefactorintheGRAPESmodelandusedtoimprovetheregionalpredictionofseafogonGuangdongcoastland.(1)Therelationshipbetweenthisfactorandtheoccurrenceofseafogisexplicit:Whentheseafoghappens,thevalueofthisfactorisalwayslargeinsomespecificperiods,andthenegativevalueofthisfactordecreasessignificantlyorturnspositive,suggestingtheenhancementofwarmandmoistadvectionofairflownearthesurface,whichfavorsthedevelopmentofseafog.(2)ThetransportationofwarmandmoistadvectionoverGuangdongcoastlandisfeaturedbysomestagesandthejumpingamongthesestates.Italsogetsstrongerovertime.Meanwhile,thenorthwardpropagationofwarmandmoistadvectionisquiteconsistentwiththenorthwardadvancingofseafogfromsouthtonorthalongthecoastlandofChina.(3)TheGRAPESmodelcanwellsimulateandrealizethefactorofnear-surfacetemperaturedifference.Besides,theaccuracyofregionalpredictionofmarinefog,therelevantthreatscoreandHeidkeskillscoreareallimprovedwhenthefactorisinvolved.
简介:Thisworkdevelopsnear-optimalcontrolsforsystemsgivenbydifferentialequationswithwidebandnoiseandrandomswitching.Therandomswitchingismodeledbyacontinuous-time,time-inhomogeneousMarkovchain.Underbroadconditions,itisshownthatthereisanassociatedlimitproblem,whichisaswitchingjumpdiffusion.Usingnear-optimalcontrolsofthelimitsystem,wethenbuildcontrolsfortheoriginalsystems.Itisshownthatsuchconstructedcontrolsarenearlyoptimal.
简介:Wedemonstrateawidelytunablenear-infraredsourcefrom767nmto874nmgeneratedbytheintracavitysecondharmonicgeneration(SHG)inanopticalparametricoscillatorpumpedbyaYb:LYSOsolid-statelaser.Thehome-madeYb:LYSOoscillatorcenteredat1035nmdeliversanaveragepowerof2Wandapulsedurationasshortas351fs.TwoMgOdopedperiodicallypoledlithiumniobates(MgO:PPLN)withgratingperiodsof28.5–31.5μminstepsof0.5μmand19.5–21.3μminstepsof0.2μmareusedfortheOPOandintracavitySHG,respectively.Themaximumaverageoutputpowerof180mWat798nmwasobtainedandtheoutputpulseshavepulsedurationof313fsat792nmifasech2-pulseshapewasassumed.Inaddition,tunablesignalfemtosecondpulsesfrom1428nmto1763nmarealsorealizedwiththemaximumaveragepowerof355mWat1628nm.
简介:在典型周期的装载下面的near-alpha钛合金的疲劳行为上的试验性的调查被执行模仿装载在引擎片上使用的状态的服务。低周期的疲劳(LCF)测试的轴的控制压力的紧张紧张在最大的压力和压力比率的一个范围上被执行。旋转弯曲测试用一个装载步的过程被进行揭示高周期的疲劳(HCF)限制压力。周期的弄软效果在这材料被观察,并且紧张ratcheting在900装载的最大的LCF显然发生?MPa。LCF抵抗被发现依赖于装载的最大值和压力比率。为1的HCF限制压力?NA被货车derWaals力量鰨?鰨主要地管理??