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INTRODUCTIONHowtoprotectthedatabase ,thekernelre sourcesofinformationwarfare,isbecomingmoreandmoreimportantsincetherapiddevelopmentofcomputerandcommunicationtechnology .TheArtificialIntelligenceInstituteofZhejiangUni versityhasprototypedaDatabaseSecuritya… 相似文献
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INTRODUCTIONAsasinkandaninnersourceofnutrients,sedimentsplayanimportantroleinlakeeutroph ication.TheeutrophicationstatusofWestLakeisstillcriticalinrecentyearsevenaftermostpollutionsourcesaroundWestLakehavebeencontrolled(Peietal.,1998) ,mainlythroughtherel… 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＣｏｎｓｉｄｅｒａｂｌｅａｔｔｅｎｔｉｏｎｈａｓｂｅｅｎｆｏｃｕｓｅｄｏｎｔｈｅｃｏｎｔｒｏｌｐｒｏｂｌｅｍｏｆｕｎｃｅｒｔａｉｎｄｙｎａｍｉｃａｌｎｏｎ ｌｉｎｅａｒｓｙｓｔｅｍｓｓｕｂｊｅｃｔｔｏｅｘｔｅｒｎａｌｄｉｓｔｕｒｂａ 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅａｒｃｈｅｄｒｅｔａｉｎｉｎｇｓｔｒｕｃｔｕｒｅ ,ａｎｅｗｔｙｐｅｏｆｒｅｔａｉｎｉｎｇｓｔｒｕｃｔｕｒｅｉｎｆｏｕｎｄａｔｉｏｎｐｉｔｓ(Ｃａｉｅｔａｌ.,1 992 ) ,ｈａｓｍａｎｙｖｉｒｔｕｅｓｓｕｃｈａｓｍｏｒｅｒｅａｓｏｎ ａｂｌｅｓｔｒｕｃｔｕｒｅｓｈａｐｅ ,ｓｍａｌｌｅｒｄｅｆｏｒｍａｔｉｏｎ ,ｌｏｗｅｒｃｏｓｔ,ａｎｄｓｏｏｎ .Ｂｕｔｉｔｈａｓｎｏｔｏｆｔｅｎｂｅｅｎｕｓｅｄｉｎｅｎｇｉｎｅｅｒｉｎｇｂｅｃａｕｓｅｉｔｓａｎａｌｙｓｉｓｍｅｔｈｏｄｉｓｎｏｔｒ… 相似文献
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INTRODUCTIONMostcountrieshaveimplementednewpoli ciesontheenergysavingandenvironmentpro tection.AmericanPresidentBushsigned“TheComprehensiveNationalEnergyPolicyAct”in1992statingthatnogeneral purpose ,three phaseinductionmotorswillbeallowedintoUnit edStat… 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＭｏｌｅｃｕｌａｒｄｙｎａｍｉｃｓ (ＭＤ)ｓｉｍｕｌａｔｉｏｎｗａｓｆｏｕｎｄｔｏｂｅａｎｉｍｐｏｒｔａｎｔｍｅｔｈｏｄｏｌｏｇｙｆｏｒｓｔｕｄｙｏｆｃｏｎｄｅｎｓｅｄｍａｔｔｅｒ (Ｔｓｕｚｕｋｉｅｔａｌ.,1 996) .Ｋｉｓｅｌｅｖａｎ 相似文献
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INTRODUCTIONCoronaryarterydisease (CAD)continuestobethemajorcauseofmorbidityandmortalityinourcountry .TheactivityofbloodcoagulationfactorshasbeenshowntobeanimportantriskindicatorforCAD .However,circulatinglevelsofcoagulationfactorsmaynotaccuratelyreflectt… 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＩｔｈａｓｂｅｅｎｒｅｃｏｇｎｉｚｅｄｔｈａｔｌｏｎｇ ｓｐａｎｂｒｉｄｇ ｅｓ ,ｃａｂｌｅ ｓｕｐｐｏｒｔｅｄｂｒｉｄｇｅｓｉｎｐａｒｔｉｃｕｌａｒ,ａｒｅｓｕｂｊｅｃｔｔｏｔｈｅｄｙｎａｍｉｃｗｉｎｄａｃｔｉｏｎ .Ｔｈｅａｅｒｏｄｙ ｎａｍｉｃｓｔａｂｉｌｉｔｙ (ｆｌｕｔｔｅｒ)ｏｆｓｕｓｐｅｎｓｉｏｎｂｒｉｄｇｅｓｄｕｒｉｎｇｅｒｅｃｔｉｏｎｉｓａｓｕｂｊｅｃｔｏｆｍａｊｏｒｃｏｎｃｅｒｎｆｏｒｒｅｓｅａｒｃｈｅｒｓａｎｄｅｎｇｉｎｅｅｒｓ .Ａｌｔｈｏｕｇｈｔｈｅｐｅｒｉ… 相似文献
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INTRODUCTIONWiththerapiddevelopmentofinformationtechnologyandtheinternet,widespreadapplica tionsofpersonalcomputers,thereliabilityofthepowersupplysystemshasbecomemoreimpor tant.SinceUPS (uninterruptedpowersup plies) ,withacorepart theCVCFPWMinvert er,play… 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＩｎＣｈｉｎａａｎｄｉｎＥｎｇｌａｎｄｅｎｖｉｒｏｎｍｅｎｔａｌｅｄｕ ｃａｔｉｏｎｔａｋｅｓｍａｎｙｆｏｒｍｓａｎｄｉｓｉｍｐｌｅｍｅｎｔｅｄｂｙｍａｎｙａｇｅｎｃｉｅｓ,ｂｏｔｈｆｏｒｍａｌｌｙａｎｄｉｎｆｏｒｍａｌｌｙ.Ｄｅｖｅｌｏｐｍｅｎｔｓｉｎｂｏｔｈｃｏｕｎｔｒｉｅｓｈａｖｅｂｅｅｎ ,ａｎｄｃｏｎｔｉｎｕｅｔｏｂｅ,ｉｎｆｌｕｅｎｃｅｄｂｙｇｏｖｅｒｎｍｅｎｔｐｏｌｉ ｃｙ ,ｐｕｂｌｉｃａｗａｒｅｎｅｓｓａｎｄｓｕｂｊｅｃｔｓｕｂ ｃｕｌｔｕｒｅｓ.Ｔｈｉｓｓｔｕｄ… 相似文献