简介：不管是在应试英语还是在实用英语中，比较性文章的写作都是很常见的，有时要强调两种事物的共同点、有时要强调不同点、有时对两者都需要强调。中国人的比较往往只是零散地罗列。使文章显得无组织无层次，那么怎样才能写出英语地道、结构紧凑的比较性文章呢？

简介：Anewmethodofcontrastenhancementisproposedinthepaperusingmultiscaleedgerepresentationofimages,andisappliedtothefieldofCTmedicalimageprocessing.ComparingtothetraditionalWindowtechnique,ourmethodisadaptiveandmeetsthedemandofradiologyclinicsmorebetter.TheclinicalexperimentresultsshowthepracticalityandthepotentialappliedvalueofourmethodinthefieldofCTmedicalimagescontrastenhancement.

简介：the meals often have a great cementing effect on family life. In the eyes of the British people,half of the flavoring could not be found here. Maybe that is one of the reasons why the British food is not very delicious.The British people like desserts very much,and some have no breakfast at all or only a hot drink. The midday lunch time is from about 12

简介：only a glass of wine will be a whole night. The wine culture in Britain is like the characteristics of the British people. So we seldom see some people drunkard in the street. Additionally if the food is different,British wine culture possesses the less sense of the sensitive considerations which is connected with the social superiorities and inferiorities. I think this is a distance between China and Britain. III. The significance of knowing the differences of customWe have had a glimpse of the different customs of Britain and China. Of course what we have discussed just now are only one small aspect of the different culture. To learn the different culture is very important for our English major students and it really means a lot. Then what is the significance of understanding these differences,the fish head would be left for the guest of honor - and it is the most nutritious part (the eyes and lips are the valued delicacies offered to the senior lady present). The platter holding the fish will always be laid on the table in such a way that the fish head points towards the guest of honor (at family meals

简介：语言习得是指一个人习得语言的过程。儿童与成人之间的区别导致第一语言和第二语言习得的差异。本文从语言认知和情感因素两方面做深入分析，对第一语言和第二语言习得的差异进行比较和对照。

简介：weshouldunderstandthatthesuccessesoftheexchangesareonthebasisofmutualunderstandingofeachcountry’scustomandvalues.Thenwewillhavethepossibilitytomakeacademicexchangesandgainsomeachievements.Inauniversity,北京、上海,Inwhichwayisitwonderful

简介：目的：探讨脑电地形图与CT在常见神经系统疾病中的对比应用。方法：509例患者进行了脑电地形图和CT检查。结果：在509例患者中脑电地形图和脑CT显示了不同的改变。结论：脑电地形图和脑CT在常见神经系统疾病的诊断中，各具有其优点和不足。脑电地形图在常见神经系统疾病的临床应用中有重要价值。

简介：Nanotechnologyprovidesvariousnanomaterialswithtremendousfunctionalitiesforcancerdiagnosticsandtherapeutics.Recently,theranosticshasbeendevelopedasanalternativestrategyforefficientcancertreatmentthroughcombinationofimagingdiagnosisandtherapeuticinterventionsundertheguidanceofdiagnosticresults.Ultrasound(US)imagingshowsuniqueadvantageswithexcellentfeaturesofreal-timeimaging,lowcost,highsafetyandportability,makingUScontrastagents(UCAs)anidealplatformforconstructionofcancertheranosticagents.ThisreviewfocusesonthedevelopmentofnanomaterialsincorporatedmultifunctionalUCAsservingastheranosticagentsforcancerdiagnosticsandtherapeutics,viaconjugationofsuperparamagneticironoxidenanoparticles(SPIOs),CuSnanoparticles,DNA,siRNA,goldnanoparticles(GNPs),goldnanorods(GNRs),goldnanoshell(GNS),grapheneoxides(GOs),polypyrrole(PPy)nanocapsules,Prussianblue(PB)nanoparticlesandsoontodifferenttypesofUCAs.Thecancertreatmentcouldbemoreeffectivelyandaccuratelycarriedoutundertheguidanceandmonitoringwiththehelpoftheachievedtheranosticagents.Furthermore,nanomaterialsincorporatedtheranosticagentsbasedonUCAscanbedesignedandconstructedbydemandforpersonalizedandaccuratetreatmentofcancer,demonstratingtheirgreatpotentialtoaddressthechallengesofcancerheterogeneityandadaptation,whichcanprovidealternativestrategiesforcancerdiagnosisandtherapeutics.

简介：WereportonthetemporalcontrastperformanceofthePHELIXfacilityinviewoftherequirementsimposedbysolidtargetinteractionexperiments.Therequirementanalysisforthenanosecondandpicosecondtemporalcontrastisderivedfromempiricaldataandsimpletheoreticalmodeling,whiletherealizationshowsthatusinganultrafastopticalparametricamplifierandplasmamirrorsenablesmeetingthisspecification.

简介：目的：探讨脑电地形图与脑CT在脑感染性疾病诊断中的应用价值。方法：脑电地形图和脑CT在99例患有脑感染性疾病患者中被检查了并且进行了对比。结果：在疾病的定性和定位诊断中,脑电地形图和脑CT是一致的。但是,在阳性率方面,散发性病毒性脑炎在脑电地形图中94例是阳性,而在CT中只56例是阳性。结论：脑电地形图在脑感染性疾病的诊断中有重要应用价值。

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简介：Objective:ToexploreleveldiagnosisonCTandBAincerebrovasculardiseases.Method:CTandBAwereexaminedin53patientswithcerebrovasculardiseasesandcomparedinleveldiagnosis.Result:ThesidesonleveldiagonsisofCTandBAwereidentical.TherangofdiseaseswaslargerinBAthanthatinCT.Conclusion:BAcanhelpleveldiagnosisincerebrovasculardiseases.TheleveldiagnosisofBAandCTwerebasicallyidentical.

简介：ObjectivesTostudythecharacteristicofpulmonaryembolism(PE)incontrast-enhancedCT.MethodsTheradiologicalfeaturesweredescribedin20patientswithlobarandproximalPEdiagnosedwithaToshibaXpress/SXCTscanneraftercontrastmaterialwasadministrated.ResultsTherewere7casesofpulmonaryembolism(PE)secondarytolowerlimbdeepveinthrombosis(DVT),ofwhich2caseswererelatedtosaunabath.Wegroupedthecasesaccordingtotheirextensivenessofembolism:mild,moderate,severe,orcompleteembolism.Mildembolism:theembolioccupiedlessthan30%,oftheinnerdiameterofpulmonaryartery(PA).Medianembolism:theembolioccupied30~50%ofthePAdiameter.Severeembolism:theembolioccupiedoverhalfofthePA(50%),buttherewerecontrastflow.Completedembolism:therewasnocontrastfoundaroundtheemboli.ThedirectsignofPEwasafillingdefectornoopacificationintheaffectedbranchofpulmonaryartery(PA).Therewere9othersecondarysigns:①widenPA,②enlargedrightventricleandtherightatrium,③increasedtranslucencyofthelunganddecreasedbronchovascularshadows,④shrunkenpulmonaryveinslikeddriedrattan,⑤decreasedleftatriumandtheleftventriclesize,⑥shiftingofinterventricularseptumtotheleftandposteriordirection,⑦Thelaterallungparenchymademonstratedinatriangularshape,⑧pleuraleffusionand⑨pericardiacleeffusion.ConclusionsThediagnosisofPEwasrevealedby10radiologicalsignsbycontrast-enhancedCT:Withfullunderstandingofthepathophysiologicalbasisofthese10signs:correctdiagnosisofpulmonaryembolismcanbemade.PEiscommonlycausedbylowerlimb.Andsaunabathisoneofthemainpredisposingcauses.

简介：改进移动的目标喧嚷比率(TCR)在合成的孔雷达(SAR)中指向，形象为目标察觉和鉴定是很重要的。在这篇论文，用Cloude的分解理论，一个平均协变性矩阵能被分解成代表三个不同散布过程的矩阵的求和：单身者弹起散布，双弹起散布，并且扩散散布。使用三个部件的联合提高一幅图象的对比的一个新想法被建议。以便基于HH，HV，和VV数据与测定偏振的对比改进方法作比较，二幅组合紧张图象的轮船区域被图象binarization检测。试验性的结果证明方法在这建议纸提供更好的对比。

简介：Coherentdiffractionimaging(CDI)andptychographytechniquesbypassthedifficultyofhavinghigh-qualityopticsinX-raymicroscopybyusinganumericalreconstructionoftheimagethatisobtainedbyinvertingthediffractedintensityrecordedbyacharge-coupleddevicearray.However,thereconstructionoftheimagefromtheintensitydataobtainedfromaweaklydiffractingspecimenisknowntobedifficultbecauseoftheobviousreductioninsignal-to-noiseratio(SNR).Inthiscase,thespecimenonlyslightlymodifiestheprobediffractionpattern,resultingindifficultyintheidentificationofthedetailedstructureofthespecimenfromthereconstructedimagebecauseofthepoorcontrastandsharpnessoftheimage.Toaddressthissituation,amodificationintheimageretrievalalgorithmsusedintheiterativereconstructionoftheimageissuggested.Thismodificationshoulddoublethepresenceofhighspatialfrequenciesinthediffractionpatterntoenhancethecontrastandedgedetectioninexistingimagingtechniques.

简介：ObjectivesToinvestigateserumconcentrationofprocollagentypeIcarboxyterminalpeptide(PIP),typeⅢaminopeptide(PⅢP)andtypeIcollagentelopeptide(ICTP)inessentialhypertension(EH).MethodsSerumlevelsofPIP,PⅢPandICTPin42EHpatientsand30healthycontrolweremeasuredbyradioimmunoassays.ResultsInEHpatients,serumconcentrationofPIP,PⅢPwassignificantlyhigherthanthatin30healthycontrol.AlthoughEHpatientsdidtendtoexhibitahigherserumICTPconcentrationthannormalcontrolsubjects,thedifferencewasnotstatisticallysignificant.EHpatientswithleftventricularhypertrophyexhibitedhighervaluesofPIP(P<0.05)andlowervaluesofICTP(P<0.05)thanEHpatientswithoutleftventricularhypertrophy.NosignificantdifferencewasnotedbetweentheserumPⅢPoftheEHpatientswithandwithoutleftventricularhypertrophy(P>0.05).ConclusionsTheresultssuggestthatPIPandPⅢParesensitiveserummarkersofmyocardialcollagensynthesis.Myocardialfibrosismaybeduetotheexcessivesynthesisandinsufficientdegradationofcollagen.PIP,PⅢPandICTPmaybeindirectmarkersofmyocardialfibrosis.

简介：Propagation-basedphase-contrastimagingwassimulatedbasedonparaxialFresnel-Kirchoffdiffractionintegralandsphericalwaveillumination.Underadevelopedmicro-CTsystemparameters,theeffectsoffocal-spotsizeandimaginggeometryonphase-contrastimaginghavebeeninvestigatedusinga2-mm-thicknesspolystyreneedgephantom.Anequivalentmono-energywasusedtosubstitutethepolychromaticspectrumofthemicro-focusX-raysource.Toconsidereffectsoffocal-spotsizeanddetectorresolution,theobtainedphase-contrastimagewithanidealpointsourcewasconvolvedwithsourceintensitydistributionandpointspreadfunctionofdetector.Simulationsshowreasonableinfluencesofthetwoparameterswhichareingoodagreementwithexperimentalresults.

简介：Recentstudiesindicatedthatexceptfortheland-seathermalcontrast,therealsoexistedtheland-landthermalcontrast.Thecompositeanalysisandt-testmethodareusedtofurtherstudythelocalthermalcontrastvariationovertheAsiancontinent,andtodiscusstheassociationofseasonalvariationoflandthermalstatewithcirculationoverEastAsia,theearlysummerandsummermonsoonactivity,andtheprecipitationanomalyinChinainthedecadalscale.Resultsshowthatthepositivemeridionaltemperatureanomalytransportsdownwardfromuppertroposphericlayersinmiddle-highlatitudesnorthof25°Ninthepositiveyears.Inthezonaldirection,theTibetanPlateauheatinginthesuccessivespringactsasaforcetoinfluencetheatmosphere,leadingtotherapidtemperaturewarmingovereasternChinesecontinent,whichcouldincreasetheland-seathermalcontrastwiththenegativeSSTA.Accordingly,themonsoonactivityinearlysummeroverEastAsianestablishesearlierandthesummermonsoonintensitybecomesstronger.Theearlysummerprecipitationismore-than-normalovertheYangtzeRiver,andthesummerprecipitationismore-than-normaloverthenorthChinaandthesouthwestChina.Thesituationiscontraryinthenegativeyears.

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简介：在这个工作，SCSMEX数据被用来诊断并且比较本地陆地海热条件，与在1998的在夏季风的发作和开发上的西方的太平洋和西藏的高原的热强迫的可能的影响的讨论的焦点。结果显示出在热来源的分发之间的一种靠近的关系，陆地海形成对照。由于地面的堵住的效果，在有更多的明显的纵贯的陆地海对比的区域的热来源的主要最大的地区更显然是向南方的专门与海洋比那些定位了。加热的表面与在土地和海之间的明显的季节变异和差别被描绘。在西方的太平洋和夏季风的发作之间的关系在海面温度(SST)和潜伏的热的变化被反映。西藏的高原的影响机制在夏季风期间是不同的：它被在华南海季风期间的理智的加热并且由在印度季风期间的压缩潜伏的加热统治。