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1 STUDIEDREGIONANDANALYSISMETHODLocatedatnorthwesternmarginofTenggerDesertand70kmnortheastofMinqinCountyinGansuProvince,QingtuLakebelongstotheShiyangRiverDryDelta,andthealtitudeis1292-1310m.Theregionhasthecharacteroftemperatecontinentalariddesertcli… 相似文献
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Inter-hemispheric comparisons of geospace environment in the polar regions—A proposed cooperative research program between China and Norway 总被引:1,自引:0,他引:1
1 IntroductionGeospacedealswiththeEarth’smiddleandupperatmosphere ,thermosphere/iono sphereandmagnetosphere .This“geospaceenvironment”isofgreatscientificandpracti calinterest,particularlyasitisoftensubjecttodisturbances.Ablastwavefromthesuncancompressthem… 相似文献
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INTRODUCTIONItiswellestablishedthatinmammals,growthhormone (GH)elicitsitsgrowth promotingac tionindirectlythroughtheinsulin likegrowthfactor I(IGF I)producedmainlyintheliver.Asforteleostfishes,Inuietal.(1 985 )reportedstimulatinginvivoandinvitroeffectsofovineGH… 相似文献
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THE SOCIAL IMPACTS OF TOURISM──A Case Study in Dali,Yunnan Province,China DaiFan(戴凡)(DepartmentofGeographyandPlanning,Univers... 相似文献
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INTRODUCTIONAccumulatedevidencessuggestedaclosecorrelationbetweenneoplasticdiseaseofaquaticor ganismsandtheincreasingreleaseofgenotoxinsbyanthropogenicactivitiesintoaquaticenvironment(Mix ,1 986;Gardneretal.,1 991 ;GESAMP ,1 991 ) .Ithas,therefore,becomenecessarytoe… 相似文献
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宁越敏 《中国地理科学(英文版)》1995,(3)
THERECENTECONOMICDEVELOPMENTOFCHINA'S'MILLION'CITIESNingYuemin(宁越敏)(TheInstituteofWestEuropeanandNorthAmericanGeography,EastC... 相似文献
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《成都信息工程学院学报》2002,(4)
CommonBorelradiiofameromorphicfunctionanditsderivativeintheunitdiscZHANGQing de 1( 1)………………………………………………………………………………α scalebiorthogonalmultiwaveletpacketsXUQiong WANGLi qing 1( 5)……………………………………………Auniversalindexformulaofwaterqualityevaluationsuitedtomulti p… 相似文献
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THE STEPS FORWARD OF GIS IN CHINA 总被引:2,自引:0,他引:2
1 HISTORICALSTEPS—ATEMPORALANA LYSISResearchesofGISinChinacandatebacktotheearly 1980s .Atthattime ,aremotesensingapplica tionprojectwascarriedoutinSouthwestChinausingGISmethodintegratedwithremotesensingdatatosolvetheareameasurementautomatically .Afterthefir… 相似文献
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1 IntroductionTheArcticarea ,asthebackgroundofglobalclimateandenvironment,drawspeo ple’sattentionwithitsimpactonglobalchange (IPCC 1 990 ) .Greatamountofenergyandmassareexchangedbetweentheseaandairwithspecialinterface,air ice seasurface ,inthisarea .Thereforeiti… 相似文献
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INTRODUCTIONMorethanadecadehaspassedsincebacteriawasrecognizedasquantitativelyimportantcon sumersoforganiccarboninmarinefoodwebsandmarineecosystems (Fuhrman ,1 992 ) .ThebasicinformationonthesignificanceofthemicrobialfoodwebwaspresentedbyPomeroy ( 1 974 ) ,whopie… 相似文献
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陈昌毓 《中国地理科学(英文版)》1996,6(3):247-258
WATERRESOURCEINQILIANMOUNTAINOUSREGIONANDITSINFLUENCEONECO-ENVIRONMENTOFHEXICORRIDOR¥ChenChangyu(MeteorologicalBureauofGansuP... 相似文献
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INTRODUCTIONTheproxyofstableoxygenisotopeinlakecarbonateisidealforthereconstructionofpastcli mate (Gasseetal.,1 991 ;Wu ,1 996;Zhangetal.,1 994 ) .Asidefrombeingimpactedbylake watertemperature ,thevalueofδ18Oinlakecarbonateisalsocontrolledbythatofambientlakewa ter.High… 相似文献
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INTRODUCTIONNoctilucascintillanshastwotypesofcelldivisions:vegetativedivisionandmeioticprocess.Inthemeioticprocess,thecelldividesseveraltimeswithoutcytoplasmicdivision .Afterthenucleardi visions,upto 2 10 zoosporesareformedfromonemothercell.Thesignificanceo… 相似文献
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根据Olney及其同事[1]以及更早的Lucas、Newhouse和其他研究者的工作,Olney在70年代提出了兴奋性毒性(excitotoxin)的原始概念及兴奋性毒性这一专门术语。这些工作认为过量的兴奋性氨基酸(excitatoryaminoacid,EAA)─—谷氨酸(glutamicacid,GLU)、GLU的类似物门冬氨酸(asparticacid,ASP)等─—能过度兴奋中枢神经系统(centralnervoussystem,CNS)内的GLU敏感神经元而达到使它们致死的程度。在过去… 相似文献
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PRELIMINARY STUDY ON THE DISSOLVED AND COLLOIDAL ORGANIC CARBON IN THE ZHUJIANG RIVER ESTUARY 总被引:3,自引:0,他引:3
INTRODUCTIONEstuariescompriseamajorbiogeochemicalinterfaceconnectingthelandandthesea (Man toura,1 987) .Thebehaviorandfateofaparticularriver bornesubstanceintroducedintoanestuaryisdeterminedtoalargeextentbythebiogeochemicalpropertiesofthesubstanceaswellasp… 相似文献
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INTRODUCTIONJohannes (1 965)firstshowedtheimportanceofprotozoaasremineralizersinmarineenvironments.Thesignificanceofprotozoainthefreshwaterfoodwebhasbeenknownforthepast2 0years.Protozoaisamainpredatorofplanktonicbacteriaandphytoplankton ,andalsoafoodsourceo… 相似文献
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《中国海洋湖沼学报》1999,(1)
TITLEPAGE:Toincludethetitleofthepaper,nameoftheauthorinstitution(affiliation),city.ABSTRACT:Tobeplacedonthelowerpartofthetitlepage,oronaseparatepage,Itshouldbenolongerthan5%ofthearticle.TEXT:ManuscriptsshouldbesubmittedinEnglishonnomorethan15typewrittenpage… 相似文献