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简介：ＳｔｕｄｙｏｎｅｌｅｃｔｒｉｃｖａｒｉａｔｉｏｎｓｏｆｍｅｄｉａｉｎｅｐｉｃｅｎｔｒａｌａｒｅａｂｙｇｅｏｍａｇｎｅｔｉｃｒａｎｓｆｅｒｆｕｎｃｔｉｏｎｓＸｉａｏ－ＰｉｎｇＺＥＮＧ；（曾小苹）Ｙｕｎ－ＦａｎｇＬＩＮＩ；（林云芳）Ｚｈｏｎｇ－ＪｉｅＺＨ...

简介：我们介绍进为P-SV的近似线性思考系数方程的各向异性的参数在弱各向异性的HTI媒介挥动的Thomsen。从这，我们得到一个新、更有效、实际的思考系数方程。我们执行了到AVO属性的前面的建模，获得优秀结果。PP和PS思考数据的联合AVO属性分析能极大地减少歧义，获得更好的petrophysical参数，并且改进参数精确性。

简介：Themodulationinstabilityofquasi-plane-waveopticalbeamsisinvestigatedintheframeofgeneralizedSchrodingerequationwiththenonlineartermofageneralform.Generalexpressionsarederivedforthedispersionrelation,thecriticaltransversespatialfrequency,aswellastheinstabilitygrowthrate.Theanalysisgeneralizestheknownresultsreportedpreviously.Adetaileddiscussiononthemodulationinstabilityinbiasedcentrosymmetricphotorefractivemediaisalsogiven.

简介：基于尖光谱方法和散布媒介的圆形的Gaussian分发(CGD)模型，我们数字地模仿通过强烈散布媒介的轻集中。在目标区域的一个高对比焦点被与二进制振幅调整使用反馈优化算法生产。形成在任意的区域与一个焦点或多重foci集中是可能的。紧张的改进因素上的空间轻调整的方形的片断的数字的影响被讨论。模拟结果被发现在对为轻refocusing的理论分析的好同意。

简介：<正>AttheinvitationoftheChineseAssociationforInternationalUnderstanding(CAFIU),anAfricandelegationcomposedof14representativesfromNGOs,thinktanksandmediaofSouthAfrica,TanzaniaandNamibiavisitedChinafromJuly20to31,2013.Thethemeofthisvisitis"EnhancingPeople-topeopleUnderstandingandPromotingChina-Africa

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简介：宣传在的瑞利波浪的散特征一成层的媒介被一个时间频率分析方法分析，光滑的Pseudo-WignerVille分发(RSPWVD)的重新分配。理论模拟和实验为同类的一半空间和二分层的一半空间被实现。在试验性的结果获得的不同频率范围的组速度分散曲线都相应于在他们的表面排水量振幅的主导的模式，这被显示。多模式瑞利波浪的如此的modeidentification在inversing被要求中等参数。

简介：Toanalyzeanddepictcomplicatedfluidbehaviorsinfracturedporousmediawithvariablypermeablematrix,anintegrateddiscretecomputationalalgorithmisproposedbasedonlatticeBoltzmannmethod(LBM).Thispapercombineswiththeexternalforcemodelandstatisticalmaterialphysicstoeffectivelydescribethefeaturechangeswhilethefluidpassesthroughthefractureswithinthepermeablematrix.Asanapplicationexample,atwodimensionalrocksampleisreconstructedusingthedigitalimageandcharacterizedwithdifferentfeaturevaluesateachLBMgridtodistinguishpores,impermeableandpermeablematrixbystatingitslocalphysicalproperty.ComparedwiththeconventionalLBM,theresultsdemonstratetheadvantagesofproposedalgorithminmodelingfluidflowphenomenoninfracturedporousmediawithvariablypermeablematrix.

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简介：ＩｎｔｒｏｄｕｃｔｉｏｎＩｎ１９７３，Ｗｉｎｆｒｅｆｉｒｓｔｄｉｓｃｏｖｅｒｅｄｔｈｅｔｈｒｅ＿ｄｉｍｅｎｓｉｏｎａｌｓｃｒｏｌｗａｖｅｉｎｔｈｅＢｅｌｏｕｓｏｖ＿Ｚｈａｂｏｔｉｎｓｋｙｒｅａｇｅｎｔ．Ｉｎ１９８３，Ｗｅｌｓｈｓｈｏｗｅｄｔｈｅｅｘｉ...

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简介：Amethodbasedonmorphologicalgranulometricanalysisforthespeckleimageispresentedtoestimatethescatteringcoefficientofthescatteringmedia.Itisexperimentallydemonstratedthattheaveragegranulometricsize,derivedfromthesuccessiveopeningoperations,isapproximatelyininverseproportiontothescatteringcoefficientofthesampleinabroadillumination.Furthermore,atheoreticalmodelbasedonthespatialcorrelationfunctionofthebackscatteredintensityfortheexperimentalphenomenonisreported.Theanalysisdemonstratesthattheexplicittheoreticalrelationshipbetweenaveragegranulometricsizeofspeckleandscatteringcoefficientisestablished,andthetheoreticalpredictionisconsistentwiththeexperimentalresult.

简介：Fingeringphenomenaarecommonoccurrenceinthenaturalworld.Itgenerallytakesplacewhenalessviscousfluiddisplacesamoreviscousfluidtypicallyinporousmedia.Nowadays,suchphenomenahaveextensivelybeenstudiedduetoitsimportanceinmanyindustrialfields.Inthispaper,theeffectsofsurfacewettabilityonfingerpatternarestudiedandsimulatednumericallybytheLatticeBoltzmannmethod(LBM).Thedisplacementefficiencyisinvestigatedbyusingtwoparameters,namely,thebreakthroughtimeandthearealsweepefficiency.Thesimulationhasdemonstratedthatsurfacewettabilitywillinfluencethefingerpatternnomatterthegravityisconsideredornot,butinthepresenceofgravity,thefingerpatternismuchmorecomplicatedandirregularduetothecoexistenceandcompetitionofcapillaryforce,viscousforceandgravity.

简介：Sphericalsymmetryconvective-dispersivetransportofatracerorcontaminantfromcontinueandsluginjectionwellinsemi-infiniteporousmediaisofsignificance,especiallyforthetracertestinhugethickformation.Thepartialequationdescribingthetransportprocessbelongstoconfluenthypergeometricequation.WithvariablesubstitutionandLaplacetransform,thepartialequationmaybecovertedWeberequationandit’ssolutionisrepresentedbyparaboliccylinderfunction.Wefoundtheanalyticalsolutionbyanalyticalinversion.Besides,wealsoobtainedtheearly-timeandlate-timeapproximatesolution.Inthepaperwecomparedthesesolutionsandinvestigatedthebasiccharacteristicsofconcentrationdistributionandchange.Inearly-timeandlate-timetheapproximatesolutionisofsignificance.

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简介：students＇mathematicalunderstanding,theyarenotableyettomastertothenextdegree.Thedecreasingofstudents＇MathqualitycanbeseenonthesurveydataonProgramforInternationalStudentAssessment（PISA）thatconductedeachofthreeyears.On2003,Indonesiawasinthe38^thfrom40stateswiththescore360.On2006,itwasin50thfrom57stateswiththescore391.

简介：Superdisintegrantsarecross-linkedpolymersthatcanbeusedasdispersantsforfastreleaseofdrugnanoparticlesfromnanocompositemicroparticlesduringinvitroandinvivodissolution.Currentlyavailablesuperdisintegrantparticleshaveaveragesizesofapproximately5-130μm,whicharetoobigfordrugnanocompositeapplications.Hence,productionofstablesuperdisintegrantsuspensionswithlessthan5μmparticlesisdesirable.Here,weexplorethepreparationofcolloidalsuspensionsofanionicandnonionicsuperdisintegrantsusingawetstirredmediamillandassesstheirphysicalstability.Sodiumstarchglycolate(SSG)andcrospovidone(CP)wereselectedasrepresentativeanionicandnonionicsuperdisintegrants,andhydroxypropylcellulose(HPC)andsodiumdodecylsulfate(SDS)wereusedasastericstabilizerandawettingagent/stabilizer,respectively.Particlesizing,scanningelectronmicroscopy,andzetapotentialmeasurementswereusedtocharacterizethesuspensions.Colloidalsuperdisintegrantsuspensionswerepreparedreproducibly.Theextensiveparticlebreakagewasattributedtotheswelling-inducedsofteninginwater.SSGsuspensionswerestableevenintheabsenceofstabilizers,whereasCPsuspensionsrequiredHPC-SDSforminimizingparticleaggregation.Thesefindingswereexplainedbythehigherabsolute(negative)zetapotentialofthesuspensionsoftheanionicsuperdisintegrant(SSG)ascomparedwiththoseofthenonionicsuperdisintegrant(CP).

简介：Theeffectofwettabilityonpolymerbehaviorinporousmediaisinvestigatedthroughaseriesofsyntheticpolymerfloodsconductedinwater-andoil-wetBentheimandBereasandstonecores.Anewexperimentalsetupisusedinwhichthecoreeffluentpolymerconcentrationsarenotmeasuredduringpolymerflooding,butinsteadarepassedthroughacapillarytubethatisconnectedtothecoreoutlet.Usingthenotionofintrinsicviscosity,anapproximateexpressionispresentedthatcanbeusedtodeterminethebreakthroughtimeoftheinjectedpolymersolution.Inaddition,polymeradsorption,inaccessibleporevolume,andapparentviscositiesareevaluatedforallcoresandwettingconditions.Ingeneral,inthepresenceofresidualoil,theoil-wetcoresdisplaythelowestdegreeofpolymerretention(Berea)andthelowestinaccessibleporevolume-IPV(Bentheim).ThelargestwettabilityimpactonthepolymerbehaviorinporousmediaappearstobefortheBereaformation;polymerretentioninoil-wetcoresdecreases90%andIPV52%comparedtothecorrespondingamountsforthewater-wetones.Ontheotherhand,theestimatedpolymerretentionandIPVvaluesappeartobesimilarfortheoil-andwater-wetBentheimcores,thisisattributedtoquestionablewettabilityalteration.

简介：在WindowsMediaPlayer9正式推出两年后．WindowsMediaPlayer10?28以下简称WMP)才露出真容。不在沉默爆发就在沉默中灭亡．微软此次推出WMP10显然是下足了功夫。这款新的播放器究竟给我们带来了些什么新东西，是否值得我们升级呢？下面就让我们近距离看看WMP10的新气象。