Regional　and　Synoptic-scale　Features　Associated　with　Inactive　Periods　of　the　Summer　Monsoon　over　South　China     

This research is supported by the Research Grants Council of the University Grants Committee of Hong Kong Grant . C. H. So  Johnny C. L. Chan Department of Physics  Materials Science  City University of Hong Kong 《大气科学进展》1997,(2)

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Features of isostatic gravity anomaly and seismic activity in the Central Asian region     

方盛明  冯锐  田长征  孙桂香  王志理  李长法 《地震学报(英文版)》1997,10(6):801-805

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APPLICATION OF BED EVOLUTION MODELS OVER LOOSE AND RIGID AREAS     

Andreas MALCHEREK Research Engineer  Federal Waterways Engineering  Research Institute 《国际泥沙研究》1997,(3)

LINTRODUCTIONThesimulationofmorphodynamicsinestUariesandcoastalareasisbecauseofitSeconomicalmeritageononehandandofitSscientificcomplexityontheOtheranoutStalldingfieldofresearchanddeVelopment.TheFederalWaterwaysEngineeringandResearchinstitote(BAW)isthecentraladvisoryinstitutefortheGermanwaterwayauthority.ItisthereforereSPonsibletoprovidethescientificsuPPOrtforoptimalsedimentmanagemelltproceduresforWatCrwaymaill~ce.ThehydredynndcSystemanalysisisthemainaPProachtosupportengineeringd…  相似文献   

Using an Artificial Intelligence Method to Recognize Seismic Precursory Anomaly (SPA)     

Zheng Wenheng  Chen Junhua  Yan Zunguo  Zhang Qiuwen  and Yang LimingInstitute of Seismology  SSB  Wuhan  ChinaEarthquake Research Institute of Lanzhou  SSB  Lanzhou  China 《中国地震研究》1997,(1)

In this work,we seek for a new way to recognize and analyze the Seismic Precursory Anomaly(SPA)quantitatively.For further study of the mechanism of SPA,an artificial intelligence method,the Machine Discovery(MD)method,is proposed to process the Seismic Precursor Observation(SPO)data and to fit an analytic function to them.The analytic function is used as a criterion to identify the SPA.The algorithm of MD is worked out based on the theory of Recursive Function(RF).The data of Amplitude Factor of Solid Tide(7 value)are processed by the proposed method.We find that the subsequent data fit to the extrapolation of the discovered function during the quiet period,whereas they deviate from it before a strong earthquake.Finally,the feasibility of quantitative analysis of the SPA is testified.  相似文献   

基本层序、标志层在1∶50000区调中的应用及意义——以赣西北三都、修水幅古生界及三叠系地层为例     

蔡雄飞  印纯清  章泽军  熊清华 《沉积与特提斯地质》1997,(3)

本文以基本层序、标志层在赣西北古生界以及三叠纪地层应用为例，阐述了这两种方法各自功能以及相互渗透、相互结合的作用。论述了这两种方法在１∶５００００区调中的作用以及重要性，强调了在加强层序地层学研究同时，应注意与一些具高分辨率的地层学方法结合起来，这是把区调层序地层学工作做得更好的保证  相似文献   

SCOUR RATE FORMULA     

Zhaoyin WANGProf Dr.  International Research  Training Center on Erosion  Sedimentation. P.O.Box  Beijing  China Jinchi HUANG Dr. Senior Engineer  China Institute of Water Resources  Hydro-Power Research  P.O.Box  Beijing . Chi 《国际泥沙研究》1997,(3)

I.INTRODUCTIONhiverchannelsaresubjecttocontinuouschangeingeometryduetoillteraCtionbetWeentheflowanderodibleboundaries.Ofconcerntothedesignersofoilpipelinesacrossariver,bridgesandhydraulicworksistheproblemofscourwhichcanunderminetheStructures.Scouratsiteofbridgesandhydraulicworksoccursduetoconstrictedflowandexistenceofbridgepiers.SuchatabOfscouroccursonlyinashortsection,usuallyillthesameorderofthelengthofthehydraulicworksorbridges.Therefore,thispatternofscouriscalledlocalscour.Man}rresea…  相似文献   

CATCHMENT-WIDE, SECTIONAL AND LOCAL ASPECTS IN SEDIMENT TRANSPORT MODELLING AND MONITORING     

Helmut M.HABERSACK Research Assistant  Institute for Water Management  Hydrology  Hydraulic Engineering  Universitaet fuer Bodenkultur  Muthgasse  Vienna  Austria 《国际泥沙研究》1997,(3)

1.INTRODUCTIONOVerthelastdecadesmuchprogresshasbeenmadeconcerningsedimenttransPOrtmodellingandmonitoring.Thedifferelltiationincatchmeflt-tvide,sectionalandlocalaspectsreflectsthefactthatmanysedimenttransportandpredictionmodelsaredealingwithspecialpartsofriverSystems,mainlydifferinginscale.Overthepastyears,scaleissuesinhydrologyhaverapidlyincreasedinimportance(BLoSCHL,1996).Onalargescaletheapplicationoffractals,self-similarityanalysistolandscapeorganizationandoptimalchannelnetlvorks(O…  相似文献   

Silurian-Devonian and Jurassic Thermal Events in the Ordos Basin, China: Indications from K-Ar Dating on Illites   总被引：1，自引：0，他引：1  

Hans Ahrendt  Klaus Wemmer  Hans-J rgen Behr 《《地质学报》英文版》1996,70(4):435-447

In the Ordos basin, two distinct thermal events of different ages have been identified for the first time by means of K-Ar dating combined with illite crystallinity analysis. For the Late Triassic and Late Permian samples, the K-Ar ages of the < 0.2μm fractions (159-173 Ma) reflect an illitization age related to the Yanshanian movement and indicate a short thermal event in the Middle Jurassic; the K-Ar ages of the <2 μm fractions (210-308 Ma) are interpreted as mixed ages of detrital material and authigenic illites. The K-Ar ages of both < 0.2μm and < 2μm fractions of a Middle Cambrian sample (368 Ma and 419 Ma) correspond to the ages of the metamorphism and earliest granite intrusion in the northern Caledonian Qinling fold zone (380-420 Ma) and show a thermal event during Silurian-Devonian time.  相似文献   

午后极光强度与行星际磁场的相关   总被引：2，自引：0，他引：2  

胡红桥  刘瑞源  杨惠根  王敬芳  N.Sato  M.Kikuchi  李升贵 《地球物理学报》2002,45(4):445-452

利用1997年和199年南极中山站多通道扫描光度计的地面观测数据和WIND卫星在弓激波上游对行星际磁场(IMF)的观测数据,对午后高纬极光强度与IMF各分量、以及时钟角之间的相关进行了定量研究. 统计表明,630nm的强度Ir随IMF Bx的增大而减小,其线性相关系数为-0.3;而557.7nm的变化趋势与此相反,其相关系数要低得多. 630nm的强度随IMF By的变化曲线为一"V"形结构,其谷底在By=-3nT附近;557.7nm的强度也有相似的变化趋势,其谷底的位置在By=-2nT附近. 极光强度随IMF Bz的变化曲线为一倒着的"Z"字形结构. 630nm的强度随IMF的模B的增大而增强,其线性相关系数达到0.9,而557.7nm与B之间的相关性要差得多. 极光强度随IMF时钟角的变化曲线为一倒"V"结构,其反转点在θ=130°附近.  相似文献   

甘肃省服务干旱指标的初步研究   总被引：6，自引：1，他引：5  

刘德祥  王宝灵  瞿汶 《干旱气象》1998,(3)

利用前期底墒降水和当时降水、气温,确定了适合甘肃的干旱指数,提出了用干旱指数划分服务干旱等级的指标和气候年景划分标准。用该等级和标准与降水量、土壤湿度比较分析,能较客观地反映旱涝实际情况。  相似文献