简介：当需要为基于Microsoft．NETFramework的分布式应用程序设计数据访问层(DataAccessLayer，DAL)时，您将做出的一个关键决策就是，如何向DAL类的方法传递和接收数据。向DAL类传递和接收业务数据的选择方式非常少，但是在现实中大多数只有两种方式——使用DataSet对象和自定义业务实体对象的集合。

简介：各企业服务器网络连接的高可用性能是非常重要的，当网络连接量超出了服务器网卡的极限，那么就会白白浪费很多带宽。而双网卡绑定技术可以保证高可用性，并提供其它优势以提高网络性能。

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简介：Inthestrapdowninertialnavigationsystem,theFiberOpticalGyro(FOG)musthavehighprecisiontogiveaccuratenavigationinformation.Inthispaper,adigitalclosedloopdetectionmethodbasedontherampwavemodulatingtechnigueisintroduced.DSPandFPGAhavemanyadvantagesindigitalsignalprocessing.Inthedesign,byusingDSP,acomplexarithmeticoperationiscompletedtomeettheneedsofclosedloopcontrolofFOGwithinashorttime.AllkindsofcontrolsignalsareproducedeasilybyFPGA,underwhichDSPcouldworkproperly.CombiningtheDSPandFPGA,thedetectingmethodisimplementedsuccessfully.Intheend,theresultoftestandperformanceisgiven.FromtheresultwecanconcludethattheprecisionofFOGisimprovedandthenoisesarelimitedtoalowlevel.

简介：XishuangbannaofYunnanProvinceisafamoustropicalfoggyregion.AfieldexperimentwascarriedoutfromNovember23to30of1997duringwhichfogsoccurredregularlyeveryday.Inthepaperthecharacteristicsofmacrostructureoffogareanalyzedandthephysicalprocessesofformationanddissipationoffogarestudied.TheresultsshowthattheXishuangbannavalleyfogformsfirstlyintheloweratmospherewithtwo-layerstructuresandthendevelopssuddenlyintheverticaldirectionafterreachingtheground.Furthermore,thevegetationeffectontheformationanddissipationoffogisdiscussedspecially.

简介：在简述光纤陀螺(FOG)的发展与现状的基础上,对国外捷联式FOG航姿基准、FOG平台罗经和FOG在潜艇惯导系统中的应用进行了述评.最后,对我国发展基于FOG的舰载导航仪器提出几点建议.

简介：在冰生长上冻结毛毛雨的直接、间接的效果在全面的冰厚度，雾，和在Enshi雷达车站在2008和2009的冬季期间执行的降水观察运动期间为十个结冰毛毛雨事件被分析(30牴灯獯桰牥?湵潣灵敬?瑳畲瑣牵?景吠琭灹?癥湥獴

简介：Basedonthehigh-resolutiondatasetscollectedinaseafogfieldexperimentatthenortherncoastofSouthChinaSea,thevariationsofliquidwatercontent(LWC)andnetlongwaveradiationflux(NLRF)duringtwoseafogeventson16th-17thand18th-19thMarch,2008areexaimeedbywaveletanalysis,andthecoolingmechanismsforfogformationandpersistencearealsoinvestigated.Themainresultsareshownasfollows.(1)Seafogmaydevelopandpersistwhetheritiscloudyornotaloft.However,whenthereiscloudalofttheLWCislessandwindspeedinseafogishigherthanthatintheclearsky.(2)Thequasi-periodicoscillations(QPOs)ofNLRFareobservedintheformationstageofthetwofogs.QPOsofLWCareonlyfoundinthedevelopingstagenomatterwithcloudlessorcloudycondition.(3)Itislikelythatseafogformsbythecoolingeffectsoflongwaveradiationanddevelopsthroughtheverticalmixinginducedbytheradiativecoolingattheupperlevel.(4)Duringseafogdevelopmentandpersistence,othermechanismscouldalsoplayimportantrolesinfog-layercooling,suchasturbulentheattransportandradiationtransportbetweenair-seainterfaces.

简介：ThesynopticanalysisofseafoginwesternAntarcticsearegionismadebasedontheobservationdataintheChineseAntarcticstation,GreatWallStation,fromDecember1994toNovember1995,andthefacsimileweatherchartsissuedbyChile.Itisfoundthatmorethan90%foginthisregionistheadvectioncoolingfog.Also,thesynopticmechanismofthefogcreationanddistinctionisdiscussedbyanalyzingthepressurefield,thetemperaturefieldandtheupperlevelstratification.Finally,thefocusofattentioninforecastingfogispointedout.

简介：TwofieldexperimentswereperformedinordertodissipatethefogatWuqingDistrictofTianjininNovemberandDecemberof2009.Hygroscopicparticleswereseededtodissipatefogdropletson6-7November,2009.Liquidnitrogen(LN)wasseededintothenaturalsupercooledfogintheexperimentsof30November–1December,2009.Significantresponsewasfoundafterseeding.Significantchangeswereobservedinthemicrostructureoffoginthefieldexperiments.Theoffogdropletchangeddramatically;itincreasedfirstandthendecreasedafterseeding.RemarkablevariationalsowasfoundintheLiquidWaterContent(LWC)andinthesizeoffogdroplet.TheDropletSizeDistribution(DSD)offogbroadenedduringtheseedingexperiments.TheDSDbecamenarrowaftertheseedingended.Afterseeding,thedropletswerefoundtobeatdifferentstagesofgrowth,resultinginatransformofDSDbetweenunimodaldistributionandbimodaldistribution.TheDSDwasunimodalbeforeseedingandthenbimodalduringtheseedingexperiment.Finally,theDSDbecameunimodallydistributedonceagain.

简介：FY-1D是中国的第二颗国家操作气象卫星，并且与监视雾相比是好一些的。然而，关于用FY-1D监视雾的研究是很少的。在这篇论文，基于典型FY-1D数据，雾是光谱的在不同隧道的特征用用FY-1D监视雾的直方图分析方法，和一个方法被分析被建议。结果显示第4条隧道是的第一and为雾的鉴定的FY-1D的代表性的隧道。在第一隧道，雾与一致静脉，光滑的顶，和清晰边界，并且它的反照率是20%∼48%。在第4隧道，雾的亮度和温度是272∼289K，和在雾的并且扎根的表面的家之间的差别价值是不超过6K。

简介：Inthispaper,aheavyseafogeventoccurringovertheYellowSeaon11April2004wasinvestigatedbaseduponobservationalandmodelinganalyses.Fromtheobservationalanalyses,thisseafogeventisatypicaladvectioncoolingcase.Seasurfacetemperature(SST)andspecifichumidity(SH)showstronggradientsfromsouthtonorth,inwhichwarmwaterislocatedinthesouthandconsequently,moistureislargerinthesouththaninthenorthduetoevaporationprocesses.Afterfogformation,evaporationprocessprovidesmoremoistureintotheairandfurthercontributestofogevolution.TheseafogeventwasreproducedbytheRegionalAtmosphericModelingSystem(RAMS)reasonably.Therolesofimportantphysicalprocessessuchasradiation,turbulenceaswellasatmosphericstratificationinseafog’sstructureanditsformationmechanismswereanalyzedusingthemodelresults.Therolesoflongwaveradiationcooling,turbulenceaswellasatmosphericstratificationwereanalyzedbasedonthemodelingresults.Itisfoundthatthelongwaveradiativecoolingatthefogtopplaysanimportantroleincoolingdownthefoglayerthroughturbulencemixing.Thefogtopcoolingcanoverpowerwarmingfromthesurface.Seafogdevelopsupwardwiththeaidofturbulence.Thebuoyancyterm,i.e.,theunstablelayer,contributestothegenerationofTKEinthefogregion.However,thetemperatureinversionlayerpreventsfogfromgrowingupward.

简介：Basedonacurrentfogdetectiontheory,amultibandthresholdmethodforMODISdatawasputforwardtodetectdaytimefogintheSouthChinaSea.ItusedBands1,2,18,20and31ofMODISdatatoseparatefogfromthecloudandtheseasurface.Thedigitaldetectionindexeswereasfollows.IfRB1<20%,RB2<20%andRB1>RB2,thepixelwasidentifiedtobetheseasurface.IfRB1>55%,RB2>55%andTB31<273K,thepixelwasidentifiedtobeamiddle-andhigh-levelcloud.IfIFC>20,thepixelwasclassifiedtobeseafog.ThemethodwasverifiedwithseafogdataobservedfromthecoastalregionofGuangdongduringJanuary-April2011.Outofthe13samplesofsatellitedetection,ninewereconsistentwiththesurfaceobservations,threewereidentifiedtobelow-levelthecloudaccordingtothesatellitedetectionbutfogaccordingtothesurfaceobservations,andonlyonesamplewasidentifiedtobetheoceansurfacebythesatellitedetectionbutfogbythesurfaceobservations.BecausetheMODISdatacannotpenetratethecloudorfog,themodelwasdesignedforasinglefieldofviewwhichhadonlyonelayerofcloudorfog.Itcanaccuratelydistinguishfogwhichisnotcoveredbythecloud,butitidentifiesfogascloudiftheformeriscoveredbyacloud.Generallyspeaking,themodeliseffectiveandfeasible.

简介：网管和用户为“IP和MAC绑定”一事争论得喋喋不休，到底此事谁说了算?在后面的文章里会找到答案。

简介：本文在对顾客绑定进行文献研究的基础上，选择网络零售行业进行实地研究，从公司和消费者双向视角出发，利用深度访谈技术，形成顾客绑定策略集的初始要素。然后，在问卷中采用“消费者购买决策”的顾客绑定测量方法进行大规模问卷调查。最后，利用调查数据检验顾客绑定策略集的信度和效度，修正并形成了三个多题项顾客绑定策略集，包括二维度（“省钱”和“赠送礼品”）的财务绑定策略集，二维度（“顾客关注”和“创建社区”）的社会绑定策略集和三维度（“快速服务”、“便利服务”和“安全服务”）的结构绑定策略集。

简介：一个朋友通过支付宝向我的支付宝账户汇了一笔款,我以前绑定的银行卡暂时找不到了,请问,如何重新绑定一个新的银行卡?首先,与支付宝绑定的银行卡账户名要与支付宝开通时的身份证姓名一致,接下来登录到自己的支付宝账户,

简介：咱的网管谈到“他能够掌控局域网内的计算机进行IP和MAC绑定”。难道他真的大权在握了吗？并非如此，我能对“IP和MAC的绑定”做出修改。

简介：摘要：随着物联网技术的不断发展，越来越多的设备被连接到互联网上，这些设备的安全问题也越来越受到关注。DNS重绑定攻击是一种常见的攻击方式，可以通过欺骗DNS服务器来攻击物联网设备。本文通过对DNS重绑定攻击的原理和实现方式进行分析，探讨了物联网设备受到DNS重绑定攻击的原因和影响，并提出了相应的防御措施。

简介：Foghasrecentlybecomeafrequenthigh-impactweatherphenomenonalongthecoastalregionsofNorthChina.Accuratefogforecastingremainschallengingduetolimitedunderstandingofthepredictabilityandmechanismoffogformationassociatedwithsynoptic-scalecirculation.Onefrequentsynopticpatternoffogformationinthisareaisassociatedwithcoldfrontpassage(cold-frontsynopticpattern,CFSP).ThispaperexploredthepredictabilityofatypicalCFSPfogeventfromtheperspectiveofanalyzingkeycharacteristicsofsynoptic-scalecirculationdeterminingfogforecastingperformanceandthepossiblemechanism.TheeventwasensembleforecastedwiththeWeatherResearchandForecastingmodel.Twogroupsofensemblememberswithgoodandbadforecastingperformancewereselectedandcomposited.Resultsshowedthatthepredictabilityofthiscasewaslargelydeterminedbythesimulatedstrengthsofthecold-frontcirculation(i.e.,troughandridgeandtheassociatedsurfacehigh).Thebad-performingmemberstendedtohaveaweakerridgebehindastrongertrough,andassociatedhigherpressureoverlandandaweakersurfacehighoverthesea,leadingtoanadverseimpactonstrengthanddirectionofsteeringflowsthatinhibitwarmmoistadvectionandenhancecolddryadvectiontransportedtothefocusregion.Associatedwiththiscolddryadvection,adversesynopticconditionsofstratificationandmoistureforfogformationwereproduced,consequentlycausingfailureoffogforecastinginthefocusregion.Thisstudyhighlightstheimportanceofaccuratesynoptic-scaleinformationforimprovedCFSPfogforecasting,andenhancesunderstandingoffogpredictabilityfromperspectiveofsynoptic-scalecirculation.

简介：BasedondataofradiationfogeventsinXuanen,Hubeiprovince,2010,thispaperanalyzesthemicrophysicalprocessandevolutioncharacteristicsofradiationfogswithcomplicatedsubstrateintheupperandmiddlereachesoftheYangtzeRiver,andcomparesthemwithfindingsinotherareas.Resultsareasfollows:radiationfoginXuanenisevidentlyweakerindropletnumberconcentrationandliquidwatercontentthanlandfogsinotherareas.Itsliquidwatercontentfluctuatesobviously,0.01g/m3withvisibilityof1,000meters,whichisquitedifferentfromthatinurbanareas,butsimilartotheNanlingMountains.Bi-modaldropletdistributionislikelytooccurinXuanenmountainradiationfog(MRF)events.StatisticalanalysisshowsthattheobserveddropletsizedistributioncanbepiecewisedescribedwellbytheGammadistribution.Thereisapositivecorrelationbetweenliquidwatercontent,fogdropletconcentrationandmeanradius,especiallyinthedevelopmentanddissipationstage.CondensationgrowthanddropletevaporationaremajorprocessesofXuanenMRF.Thedissipationtimecoincidedwiththetimewhenthegrasstemperaturereachedthepeakvalue,whichindicatedthatdewevaporationisakeyroleinmaintainingXuanenMRF.Intheearlystageofdensefog'sgrowth,dropletswithdiameterofover20micrometerscanbeobservedwithvisibilityof800-1,000m,whichmightbecausedbythetransportationoflowclouddropletstoearth'ssurfacebyturbulence.Bigdropletsintheinitialstagecorrespondtohigherwatercontent,leadingtothehigherobservedvalueofwatercontentofXuanenMRF.