共查询到20条相似文献,搜索用时 31 毫秒
1.
1 Introduction Inecology ,apredator preyinteractionofbothpopu lationsinonedimensionisdescribedbythefollowingsystem[1] :ut(x ,t) =uxx uM (u ,v) ,vt(x ,t) =βvxx vN(u ,v) ,(1)whereβisapositiveconstant,uandvarethepreyandpredatordensitiesrespectively ,andthefunctionsMandNare… 相似文献
2.
Aim :TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevel opmentsandachievementsinscientificresearchinChinaandoverseastotheworld sscientificcircles,speciallytost… 相似文献
3.
Aim :TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevel opmentsandachievementsinscientificresearchinChinaandoverseastotheworld sscientificcircles,speciallytost… 相似文献
4.
THEORETICALCONSIDERATIONSInthepast 2 0 years,withpsycho linguisticsprobingdeeperintolearningstrategies,researchonlisteningcomprehensionstrategies,donebywesternscholars,hasalsoreachedaclimax .Theirresearchmainlycoverstwoaspects :researchonlisteningcomprehens… 相似文献
5.
Aim:TheJournalofZhejiangUniversity(Science)iseditedbyaninternationalboardofdistinguishedChineseandforeignscientists,andisaimedtopresentthelatestdevelopmentsandachievementsinscientificresearchinChinaandoverseastotheworldsscientificcircles,speciallytosti… 相似文献
6.
INTRODUCTIONATMhasgreatsuperiorityincertainaspects,suchasresourceallocationflexibility ,qualityofserviceguaranteeing ,integratedtrafficsupport ing ,etc .ATMhasbeenadoptedbyInternation alTelecommunicationUnion (ITU)astheex changeandmultiplexingtechniquesofth… 相似文献
7.
8.
INTRODUCTIONThispaperconsidersthemixed effectcoeffi cientsemiparametricregressionmodelZ =X′α Y′β g(T) e,(1 )whereX ,YandTarerandomvectorsonRp,Rqand [0 ,1 ]respectively ,αisap dimensionalfixed effectparameter,βisaq dimensionalran dom effectparameter (Eβ =b ,Cov(β) =∑) ,g(.)i… 相似文献
9.
Alberto Rocha TONG Fu 《上海大学学报(英文版)》1999,3(4):293-298
1 Introduction Breastcancerisoneofthemostmalignantdiseases,especiallyforwomen.Anearlydetectioncansavelives,achievedbyearlydetectionwithmammograms.Itisanintensivetaskfortheradiologistbecausemultiplereadingsofasinglemammogramarenecessaryinordertoincre… 相似文献
10.
Doctoral Candidate: TAN Fa sheng Advisor: Prof. DAI Shi qiang Prof. WENG Pei fen 《上海大学学报(英文版)》1999,3(3):259-262
Motivatedbyredesigningafuselageinengineeringapplication,thenumericalandexperimentalinvestigationoftheseparatedflowfieldaroundaspecialbluntbodyisdescribedinthisthesis.Theaerodynamicresponseofthebluntbodyissuccessivelystudied.Thethesisconsistsoffour… 相似文献
11.
邓凡艳 《湖南师范大学教育科学学报》2001,(1)
长期以来 ,传统语言学家认为“体”(ASPECT)与“时”(TENSE)都属于语法范畴 ,但若就表达效用而言 ,英语动词的“体”与“时”和语用学有着千丝万缕的联系 ,这是因为语用学与语法本来就互相补充 ,相互重叠。所谓“体”,其实就是表示某一动作或过程在某一时间内处于何种状态的形式。在英语中 ,动词有两个“体”:进行体 (progressiveaspect)和完成体 (perfectaspect)。本文着重讨论进行体的语用功能与英语动词词汇意义的关系。一、进行体的分类及语用功能进行体可分为现在进行体 (presentpr… 相似文献
12.
INTRODUCTIONSoftsoiliswidelydistributedovercoastalandriversideregions ,wherebecauseoftheirspeciallocations,oil tanksareoftenconstruct ed .Largeoil tankswithheavyloadaresensitivetodifferentialsettlement.Engineersareusuallymoreconcernedwiththedifferentials… 相似文献
13.
听力部分1 听对话 ,并圈出对话中出现的词汇 (斜体为磁带录音内容 ) (1 )A :Whereismykite,mummy?B :Idon’tknowexactly.a .bike b .kite c .ride(2 )A :Now ,let’shaveatest.B :It’sagoodidea .a .test b .rest c.west(3)A :Wheredoesyourgrandfatherlivenow ?B :Oh,helivesinShanghainow .a .leaves b .loves c.lives2… 相似文献
14.
《上海大学学报(英文版)》2000,(4)
1 Introduction Computerintegratedmanufacturing (CIM)asaphi losophyhasreceivedworldwideattentionsincethe1980sandhasbeenappliedtodirectenterprisespro ductionsuccessfullyinmanyindustrializedcoun tries[1] .TheUSgovernmenthasconsideredtheman ufacturingindustrytob… 相似文献
15.
听力部分1 听对话 ,并圈出对话中出现的词汇 (斜体为磁带录音内容 ) (1 )A :Whereismykite,mummy?B :Idon’tknowexactly.a .bike b .kite c .ride(2 )A :Now ,let’shaveatest.B :It’sagoodidea .a .test b .rest c.west(3)A :Wheredoesyourgrandfatherlivenow ?B :Oh,helivesinShanghainow .a .leaves b .loves c.lives2… 相似文献
16.
INTRODUCTIONProteindeficiencyisoneofthemostseriousproblemsintheworld ,especiallyindevelopingcountries.Ithasbeenestimatedthatabouttwo thirdsofthepopulationintheworldaresufferingfromlackofprotein ,especiallyhigh qualityani malprotein (Liu ,1 992 ) .Itistherefore… 相似文献
17.
The 10 2 yearoldZhejiangUniversitynowputsouthernewjournal″JournalofZhejiangUniversity (SCIENCE)″,aimedatdevelopingacademicresearch ,pro motingacademicexchange ,andnurturingcreativityinthespiritofseekingthetruth .Creativityishighlyvalued .Therehavelongbeentwok… 相似文献
18.
1 Introduction Sincethe 90’s ,thefemtosecondlasertechniqueshavebeenusedtostudyvariousultra processwithinmaterials,becauseofitshightime resolution .Inchemicalreactions ,chemicalbondbreakingorbondformationisonthescaleoffemtosecond (10 - 15sec ond) [1] .Withfemtosecon… 相似文献
19.
INTRODUCTIONOn lineseparationandpreconcentrationhavereceivedconsiderableattentioninflowinjectionanalysiscoupledwithatomicabsorptionspec trometryduringrecentyearsandiswidelyap pliedforselectivityandsensitivityenhancement(Fang ,1 995 ) .Automationofthesamplep… 相似文献
20.
INTRODUCTIONAntisenseoligodeoxynucleotides (ASODN )caninhibittranscriptionandinterferewithspe cialgeneexpression .AfixedpointontheK rasgenewithhighmutationrateinpancreaticcarci nomaoffersanintracellulartargetforpancreaticcarcinomagenetherapywithASODN (Cai… 相似文献