简介：【写作实例】面对当前中学生“出国热”，请你以StudyingAbroad为题，谈谈中学生出国留学的利与弊。（可以从以下几方面考虑，但不一定要面面俱到：年龄、生活经验、自理能力、生活学习费用、语言学习环境、传播民族文化、学习国外先进科学技术）。词数：150左右。

简介：每年都有许多高中毕业生选择出国留学。那么出国留学都有什么条件呢？每个国家的要求是否一样呢？需要参加什么考试呢？请看下文。

简介：本刊于2006年7～9月举办了新东方“快乐暑假”全国中学生英语征文大赛,来稿众多,经过层层筛选,获奖结果已于2006年12月揭晓。本期选登的是获大赛特等奖的作品。我们请外国语言专家JimTodd和新东方包凡一老师对其进行了详细的修改和点评。

简介：复杂适应系统(cas)-包含当他们交往，适应或学习的许多部件的系统-在重要当代的问题的心。学习ofcas提出唯一的挑战：一些我们的很强大的数学工具，特别地，包含的方法修理了点，引起注意的人，等等，具有在理解cas的发展的有限帮助。这篇论文建议方法修改研究方法和工具，与基于计算机的模型的角色上的一个重音，到增加我们cas的理解。

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简介：EDITOR’SNOTE:Longyearbyen,capitaloftheSvalbardIslands,entereditsannualprolongedperiodofdarknessonOctober9,2001.ThesunwasnotduetoriseagainuntilMarch8,2002.Duringthefive-month-longperiodofperpetualnight,peoplelivinginthenorthernmosthumansettlementseeonlystars,snowandice.Inthispartoftheworld,however,therearefourstudentsfromtheTibetAutonomousRegionjoint-ventureschool.

简介：Tosomeextent,China’ssecurityenvironmentdependsonifithasactivecreation,understanding,attentionandvigilanceonthecommoninterestsofthesurroundingareasandgroupsofstates,andifitcouldtaketimelyandpropercountermeasures.Inmypersonalview,twoprinciplesshouldbetakenintoconsideration.Thefirstprincipleisto

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简介：Inautumnof1946TseringWangdo,thenjust12yearsold,wenttoIndiatostudy.Thatwas60yearsagowhenIinterviewedhimin2006.Obviously,theyoungmanhasgonebuttheold

简介：Inordertoresearchsurfacecharacteristicsofliquidmetalwhichbasedonhydrodynamicstheoryandinteractionprinciplebetweenlaserwaveandsurfacetensionstationarywaveofliquidmetal,itisfinishedtoprovideanentirelytheoreticalequation,apparatusandtechniquesofthemeasuringthesurfacetensionforliquidmetalathightemperature.Thisapparatusisanautomaticmeasuringsystemforinformationcollectingandprocessing,inwhichacomputerisattachedtochargecoupleddevice,drivingcircuitsandA/Dconverter.ApplyingthenewapparatusthesurfacetensionvaluesofSn-Pbbasedbinaryandternaryalloysoldershavebeenobtainedonthebasisoftheabovework.TheexperimentalresultsindicatethatthesurfacetensionvaluesofliquidmetalSn-Pbbasedsoldersaredecreasedby37.3%and31.9%respectively.When1%ofBiorInisaddedinthesolders,theelementsBiandInhaveevidentsurfaceactivityinSn-Pbbasedsoldersandthewettabilityofthesoldersinincreasedwithincreasingsurfaceactivity.

简介：ＡＮｅｗＭｅｔｈｏｄｏｆＳｔｕｄｙｉｎｇＳｕｒｆａｃｅＡｃｔｉｖｉｔｙｆｏｒＬｉｑｕｉｄＡｌｏｙｓ①②ＹＡＮＧＹｏｎｇｚｈｅｎｇ（ＤｅｐａｒｔｍｅｎｔｏｆＡｐｐｌｉｅｄｐｈｙｓｉｃｓ，ＮｏｒｔｈｗｅｓｔｅｒｎＰｏｌｙｔｅｃｈｎｉｃａｌＵｎｉｖｅｒｓｉ...

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简介：InordertocompareandevaluatethreeanimalmodelsforstudyingthepathogenicityofStaphylococcusepidermidisstrains,threeexperimentalanimalmodels,namely,murineintra-venousLD50,mouseforeignbodyinfectionandratcentralvenouscatheter(CVC)infectionmodelswereusedtoassesstherelativevirulenceoftwoS.epidermidisstrains,ATCC12228and97-337.Theresultsfromthreeanimalmodelswerecomparable,indicatingS.epidermidis97-337wasmorevirulentthanstrainATCC12228.TheratCVCinfectionmodelbestmimickedtheconditionsofclinicalpatientswithintmvenonscatheters,andmoreinformationcouldbeobtainedfromthismodel.Weconcludethatdifferentinvivomodelsservefordif-ferentpurposes,andtheratCVCinfectionmodelismostsuitableforstudyingspecificcharacteristicsofcatheterrelatedinfectionscausedbyS.epidermidisstratus.

简介：Gainingathoroughunderstandingofthetheoreticalprinciplesofrockbreakingwithadisccutterisacriticalissueintunnelboringmachine(TBM)technology.Tofullyconsiderthecomplexityandimportanceofthebasicprinciplesofrockbreakingduringtunnelexcavation,inthispaperweuseanewmethod,thesmoothparticlehydrodynamics(SPH),tostudytherock-breakingmechanismandverifyitsaccuracyandfeasibility.UsingtheSPHmethod,weinducetherockfragmentationprocesswithtwocuttersinsynchronousandsequentialorders.Theresultsshowthatwhenthecuttersactonrocksequentially,thesecondindentationinfluencesthecrackevolutionofthefirstindentation.Withincreasedcutterspacing,thesecondcrackgraduallybecomesindependentofthefirstcrack.Undersynchronousactionofthetwocutters,abursiformnucleusisgeneratedbeneaththecuttersandtheareaofthenucleusincreaseswithincreasedcutterspacing.Whetherthecuttersactontherocksequentiallyorsynchronously,wefoundtheoptimumcutterspacingofourchosenrocktypetobe60mm.Ouranalysesresultsshowthattheefficiencyofsequentialrockcuttingissuperiortosynchronouscutting,bothwithrespecttocrackevolutionandcutterforce.

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简介：Theskyradianceanddegreeofpolarizationwithmultiplescatteringprocessconsideredwerecalculatedinthispaperbysolvingvectorformradiativetransferequationiteratively.Numericalexperimentforsimultaneouslyretrivingthesizedistribution(SD)andthecomplexrefractiveindex(CRI)ofaerosolparticlewasconductedwiththedegreeofpolarizationofskylight(DPS)andthelibrarymethodused.ItisshownfromtheresultsthattherealpartofCRIisalwayssensitivetoDPS.ButsituationissomewhatcomplicatedfortheimaginarypartofCRI.Therefore,itisexpectedthattherealpartofCRIcanberetrievedfromDPSanditsimaginarypartshouldberetrievedastheparticleislargeinsize.Inthispaper,sevensetsofDPSmeasurementson6January,1990inBeijingweregivenandtheopticalcharacteristicsofaerosolwereretrieved.

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简介：Hearingloss(HL)isoneofthemostwidespreadsensorydisorders,affectingapproximately1in500newborns.HeritablediseasesoftheinnereararetheleadingcausesofprelingualHL.TreatingofhereditaryHLandunderstandingitsunderlyingmechanismsremaindifficultchallengestootolaryngologists.Asstemcellsarecapableofself-renewalanddifferentiation,theyareideallysuitedbothfordiseasemodelingandregenerativemedicine.Recently,descriptionofinducedpluripotentstemcells(iPSCs)hasallowedthefieldofdiseasemodelingandpersonalizedtherapytobecomefarmoreaccessibleandphysiologicallyrelevant,asiPSCscanbegeneratedfrompatientsofanygeneticbackground.ThisreviewbrieflydescribestheadvantagesofiPSCstechnologyanddiscussespotentialapplicationsofthispowerfulbiologicaltoolinstudyingandtreatinghereditaryHL.