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1.
应用遗传神经网络方法分析我国降水化学数据   总被引:15,自引:0,他引:15  
收集了111组包含Ca^2+、Mg^2+等8种离子浓度和PH值的我国降水化学数据,并用遗传神经网络(Genetic Neural Net-works,GNN)方法建立了这些离子浓度和PH值绵BP网络模式,运用这些模式计算了各离子浓度对PH值的贡献,结果表明,我国各地降水PH值与各地区酸性离子与碱性离子相互用途相关,其中生离子的中和作用起着主导作用。  相似文献   

2.
IntroductionThe 2 9thInternationalOlympicGamewillbeheldinBeijingin 2 0 0 8.TheOlympicGameshavenotbeenheldindevelopingcountriessincetheMexicoOlympicGamesin 1968.ItisexceptionallysignificanttoholdthegreatgameinBeijing,adenselypopulatedandfastgrowingmegalopoliswi…  相似文献   

3.
NutrientcyclingcharacteristicsofQuercusacutisimaandPinusmasonianamixedforestintheThreGorgeReservoirarea,ChinaWuGangDepartmen...  相似文献   

4.
GeochemicalcharacteristicsofrareearthelementsinWuhansectionoftheYangtzeRiverWangLijun;ZhangShen;ZhangChaosheng(InstituteofGeo...  相似文献   

5.
1 Maininstitutionsandchanges1.1 EnvironmentalprotectionleadinggroupThefirstorganizationconcernedsolelywithenvironmentalprotection ,theEnvironmentalProtectionLeadingGroup (LeadingGroup)wassetupundertheStateCouncilin 1974,whichwasformedtoco ordinateenvironment…  相似文献   

6.
AnalysisonreasonsfortheYelowRiver’sdryupanditsecoenvironmentalimpactsGaoYanchunInstituteofGeography,ChineseAcademyofScien...  相似文献   

7.
ApplicationofneutronactivationanalysisingeochemistryandcosmochemistryG.M.Kolesov(VernadskyInstituteofGeochem&AnalChem.,Russia...  相似文献   

8.
IntroductionRecentfindingsfrommercuryresearchindicatethatthemajorsourcetolakesisatmosphericdeposition(Sorensen ,1990 ;Glass,1990 ) ,andthatsignificantsourcestotheatmospherearefossilfuelcombustionandincinerationofmunicipalsolidwasteandsludge(Glass,1991;White ,1992 ;C…  相似文献   

9.
IntroductionGeostatisticshasprovenusefulforcharacterizingandmappingthespatialvariationofsoilproperties (Webster,1985;Trangmar,1985;Goovaerts ,1999) .Mostpreviousgeostatisticalstudiesfocusedonthedataofarelativelysmallspatialscale(Chien ,1997) .Theapplicationofgeostat…  相似文献   

10.
1 IntroductionGuizhouProvinceislocatedinsouthwestChinawithatotalareaof 176.2 8thousandsquarekilometers,ofwhich 87%ismountain ,10 %ishills,3%isriver,basinandplain .Guizhouisamountainousprovincewithrichmineralresources,amongwhichmercuryreserveranksfirstinChina,eveni…  相似文献   

11.
NeutronactivationmethodintheanalysisofenvironmentalobjectsG.M.Kolesov(V.I.VernadskyInstituteofGeochem。&Anal.Chem.,RussianAcad...  相似文献   

12.
TheoreticalStudyGeologicalFeaturesandMetallogenicTypeoftheLiushashanGold (Molybdenum)DepositinEjinQi(Prefecture) ,WesternInner MongoliaNieFengjunetal.(1) (1)……………………………………………………………………………………………CharacteristicsofTraceElementsinAketishikanGoldDeposit ,XinjiangYu…  相似文献   

13.
保护全球共同的财富──大气TheAtmosphere:GlobalCommonstoProtect¥G.O.P.OBASIAbstract:Inthisarticle,theauthordescribestherisksfromclimatecham...  相似文献   

14.
Chinaisrichinmercuryresources,rankingthirdintheworld .MercuryoresaremostlydepositedinSouthwestandCentralChinalikeGuizhou ,SouthernShaanxi,NorthernHenanandEasternSichuan provinces,particularlyGuizhouwhere 75%mercuryoreofallChinaexists.Annualproductionin 60’sa…  相似文献   

15.
IntroductionBleachingwastewaterfrompulppaperplantscontainsmanykindsofchlorinatedorganiccompoundswhichareprovedtobecarcinogenic,mutagenicandrefractory(Gellman,1988;Paasivirta,1988;Garden,1990;Suntio,1988;Vuorinen,1987;Seppala,1988).Severalmethods,inc…  相似文献   

16.
脆弱的海岸     
脆弱的海岸埃加多D·戈梅兹(EdgardoD.Gomez)EdgardoD.Gomezoutlinesthethreatstocoralreefs,mangroveswampsandseagrassbedsasincreasingcoastalpop...  相似文献   

17.
日本的公害──我们的惨痛教训PollutionInJapan-BitterLessonsforUstoLearn¥(StudyGroupforGlobalEnvironmentandEconomics)Abstract:Thispaperpresen...  相似文献   

18.
什么是绿色技术   总被引:3,自引:0,他引:3  
什么是绿色技术WhatAreGreenTechnologies何义亮,朱向宏(同济大学环境工程学院)(北京桑德环保产业集团)ThepaperhasdevelopedtheconceptionofGreenTechnologybothinnarrows...  相似文献   

19.
AmixedintegerlinearprogrammingapproachformunicipalsolidwastemanagementGordonGuoHeHuangEnvironmentalSystemsEngineering,Univer...  相似文献   

20.
Sincetheinternationalgeophysicalyear(IGY,1957—1958),Antarcticahasbeentheobjectofintensivescientificinvestigationbyteamsofscientists...  相似文献   

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