简介：Inthispaper,thesimultaneouseffectsofboundarylayerandtopographyontheinstabilityofEadywaveareinvestigatedbyusinganewparameterizationoftheverticalvelocityatthetopofPBLandtheinfluencesofthestratificationofthePBL,roughnessandtheslopeofterrainareshown.Furthermore,theeffectsoftheboundarylayerfrictionandtopographyongeneralizedEadywavearealsoinvestigated.

简介：Theseparating/reattachingflowoveranaxisymmetricbackward-facingstepisanalyzedexperimentallybymeansofparticleimagevelocimetry(PIV).ThemainpurposeofthemeasurementsistheinvestigationofthemeanflowfieldaswellasoftheReynoldsstressdistributionsataMachnumberof0.7andataReynoldsnumberof3.3x10~5basedonthestepheight.Duetothestrongprogressofopticalflowmeasurementsinthelastyearsitwaspossibletoresolveallflowscalesdownto180μm(≈1%ofthestepheight)withhighprecision.ThankstothehighspatialresolutionitwasfoundforthefirsttimethattheReynoldsstressdistributionfeaturesalocalminimumbetweenthefirstpartoftheshearlayerandaregioninsidetherecirculationregion.Thisimpliesamorecomplexwakedynamicsthanassumedbefore.

简介：Glowdischargeisintroducedasanartificialdisturbancetoinvestigatetheevolutionoffirst-andsecond-modeinstabilitiesinahypersonicflatplateboundarylayer.ExperimentsareconductedinaMach6.5quietwindtunnelusingRayleighscatteringvisualizationandparticleimagevelocimetry(PIV).Detailedanalysisoftheexperimentalobservationsisprovided.Itisfoundthattheartificiallyintroduced17kHzdisturbance,whichbelongstothefirst-modefrequencyband,caneffectivelyenhancefirst-modewaves.Moreover,itcanenhancesecond-modewavesevenmoreintensely.Possiblemechanismstoexplainthisphenomenonarediscussed.

简介：Tocleanoutthesmearlayeronteethsurface,andprotecttheteethmedulla,theexperimentappliedthestudyobservingthecleanupofsixgroupsofsurfacesmearlayerofdentalcariesandthetubuleplugsreservingeffectafterusingofdifferentcavitycleanserswiththehelpofSEM.Theresultimpliedthatboththeacidicpreparationsandchelatorcouldcleanoutthesmearlayeron.teethsurfaceinsomeway,butthelateronecouldalsoreservepartialtubuleplugs,whichreducethestimulationtotheteethmedulla.Sothechelatorisbettercleansersinclinicaluse.

简介：我们构造由蒙特卡罗的神经网络基于的二层的反馈作为定点引起注意的人或作为限制周期引起注意的人存储记忆的算法。特殊注意集中于把网络的动力学与限制周期引起注意的人并且与定点引起注意的人作比较。前者比后者有更好的检索性质，这被发现。特别地，当记忆作为一个长限制的周期被存储时，假记忆可以完全被压制。limit-cycle-attractor网络的潜在的申请简短被讨论。

简介：

简介：第一条为统一全国年节及纪念目的假期,制定本办法。第二条全体公民放假的节日:(一)新年,放假1天(1月1日);(二)春节,放假3天(农历正月初一、初二、初三);(三)劳动节,放假3天(5月1日、2

简介：在教学中，经常会遇到条件不明确的问题，学生常顾此失彼，导致少解或漏解，这需要对不明确条件逐一分析讨论、做出正确的判断，这就是物理中的分类思想。

简介：摘要

简介：聚焦现收藏于荷兰阿姆斯特丹国立博物院的7幅清代绘画《天后圣迹图》,对该图的传承情况、基本内容、使用功能、艺术水平以及地域文化特色等进行综合考察。指出荷兰藏《天后圣迹图》的使用功能很可能像中国国家博物馆藏《天后圣母事迹图志》一样,作为皇室成员或高级官员的私人收藏与交流之用。并认为此图当为京津一带的画师所绘,在一定程度上反映出北方的地域文化特色。

简介：传统的泡菜坛为两头小中间大的形状,只有一个开口。这种泡菜坛有一个很大的缺点:挑一块腌好的泡菜非常困难,往往要花很长时间从上翻到下才能找到。此外,传统的泡菜坛样式陈旧,非常难看。

简介：例1：一只七彩虹128MB的U盘．插入电脑主机的USB口后，主机检测不到，U盘指示灯不亮。

简介：国外厂家推出的这款U盘数码相机堪称奇特，无需电脑连线，也无需读卡器，数码相机拍摄到的照片就可以直接传输到电脑中，因为相机本身就是一个U盘，直接插入到USB接口就可以了，目前价格未定，不过相信不会很贵。

简介：方寸之地，大有文章。别看U盘个头小，它可是设计师们最爱发挥创意的物件之一，经过他们的巧思，小U盘们都“变装”成功，让人差点认不出来呢。

简介：故障现象：插入电脑，提示“无法识别的设备”。诊断与维修：上述现象说明U盘的电路基本正常，而只是跟电脑通信方面有故障，而对于通信方面有以下几点要检查：

简介：ThefavoritefoodintheUnitedStatesisthehamburger,akindofroundsandwichofcookedgroundbeef.Thefavoriteplacetobuyahamburgerisafastfoodrestaurant.Atfastfoodrestaurantspeopleordertheirfood,waitafewminutes,andcarryittotheirtablesthemselves.

简介：Theworldeconomywassuffereddramaticallyin2008,becauseofthefinan-cialturnaoil.Itispredictedthatinthenextyears,Chinaeconomicgrowthwillslowdown,and2009wouldnotbethebottom,buttheeconomyfunda-mentalisstillhealthy.Asoft'U'turncanbeexpectedinthefuture.Macro-economyTwoofChinaeconomicgrowthpillarengines,exportsectorandreal-estateindustryhavebeensignificantlyinfluencedbytheglobalfinancialcrisis,trendsofthistwosectorsshowthatChinacouldnotbeanexceptioninthiseconomictur-moil.Theglobaleconomicturmoilhasasignificantnegativeimpactontheexportgrowth,anddomesticimportsalsoslowdownsincedomesticdemandhasbeenweaken,(SeeChart1)Asoneofthepillarindustry,realestateindustrysufferedalotundernationaldeclinelastyear,withanationalaveragedropof4.7percentonhousingprice.(SeeChart2)Domesticfixed-assetinvestmentgrowthhasalsosloweddown.Chinabusinesscyclesignalindexshowsthatthemacro-economicshasbeenslowingdown,andaccordingtothehistoryofChina'seconomy,thisdownturnwouldlastatleast3years,2009wouldnotbethecyclebottom.(SeeChart3)Thebusinesscyclesignalindexisdecliningfrom117.3inMayto94.7inOcto-ber,thefirsttimetodropunder100from1992,meaningthemacroeconomichasbeenslowingdown,butisstillinthestablezonesofar.LookingbackatthehistoryoverChina'spast30years,economicgrowthcycli-caldownturnwouldlastatleast3years.StandardCharteredBank'slatestreportreducedChinaGDPforecastfor2008to9.6percent,apoor7.9percentin2009,andevenlowerat7.1percentfor2010.(SeeChart4)ChinaisbelievedtobeshieldedfromchaoslikeUS,andfinancialwoeshavelimitedimpactonChina.Thecountryhadrichresourcereserves,greatmarketpo-tential,vigorousenterprisesandthegovernmenthadstrongmacro-controlabilities.Themajorindicatorsareinhealthycondition,whichcanhelpChinagovernmenttofighttheeconomyturmoilin2009.

简介：TheRepublicPartywoncomprehensivevictoryinthe2004U.S.generalelection.Notonlydiditkeeppresidency,expandseatsintheSenateandtheHouseofRepresentatives,italsoachievedcertainprogressingovernors'elections.ThevictoryinelectionbytheRepublicPartyreflectsthefactthatAmericasocietypaysutmostconcerntosecurityandthemainstreamofthetrendofthoughtisconservative.

简介：ThemaincauseofBush'ssuccessintheelectionandbeingre-electedPresidentisthattheRepublicansanditsconservatistideologyprevailsinAmerica.U.S.presidentialelectioniscontentionbetweenthecandidatesinpersonalcapacity,morality,experience,wealthandfamilyaswellascontentionbetweenthetwoparties.In2004election,BushisnotadvantageoustoKerryinpersonalfactors,butinthepartyitself.TheRepublicanshaveobviousadvantagestotheDemocraticParty.Themajorsourceoftheadvantagescomefromconservatistideology.

简介：