The optimum source－time function for generating finite－difference synthetic seismograms

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Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan,China

~~Characteristics of the mantle source region of sodium lamprophyres and petrogenetic tectonic setting in northeastern Hunan,China~~     

COARSE-PARTICLE TRANSPORT IN A GRAVEL-BED RIVER

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Seasonal Transition of Summer Rainy Season over Indochina and Adjacent Monsoon Region

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南亚高压流型转换的Eliassen-Palm通量特征

一、问题的提出 根据南亚高压的中心位置,可将其分为西部型和东部型。南亚高压流型转换,是指南压高压初夏移上青藏高原以后,西部型和东部型间的相互转换过程。南亚高压的这种流型转换,以盛夏7—8月最明显。 南亚高压流型转换与我国大范围天气变化有着十分密切的关系,所以关于这方面的研究工作(包括天气气候、动力分析、数值模拟等)颇多,     

区域磁异常研究的系统性论述——评介《乌克兰地盾地壳磁模型及构造》

克鲁奇霍夫斯卡娅的《乌克兰地盾地壳磁模型及构造》一书,是迄今利用区域磁异常研究地壳深部构造及其所取得的成果较为系统、而又全面的一本论著。它对我国开展这方面工作无疑有较大参考价值,并对有关方面的研究具有指导意义。 书中,作者着重讨论了地磁场与地壳深部带构造的关系,以及按作者制定的区域磁异常解释方法(其中最重要的是全面分析地壳上部磁性体     

非洲—阿拉伯克拉通的环形构造及其矿床成因的几点看法

在非洲—阿拉伯克拉通的范围内,发育着(可以划分出)不同成因,不同延长和延深的各种各样的环形构造(见插图)。它们不同程度地影响到地壳各时代的堆积物以至整个地图。陆核是最大的环形构造,在形成时代上相当于古老的原始变质岩层形成的时间。对非洲—阿拉伯克拉通基底上的这些新构造,首次采用遥感探测方法进行了研究。它分为西非(1),阿拉伯—努比亚(2),中非(3),塔恩扎尼(4),索马里(5),南非(6)以及莫三鼻给(7)等七个陆核。     

LOCAL SCOUR ESTIMATION AT BRIDGE SITE: MODIFICATION AND APPLICATION OF LACEY FORMULA

In the recent years, it has been established that b/h or h/b (b = length of the structure in the lateral direction and h = approach flow depth) is the dominant factor for the estimation of local scour depth around abutments and piers. One of the major limitations of the Lacey formula is that it predicts only one value of the scour depth for a specific river because of the absence of important parameters b and h. Therefore, its application is quite uncertain for variable b and h. Considering its limitations and experimental facts of flow concentration and shear stress amplification close to above structures, the original Lacey formula is modified introducing the parameters b and h. The applicability of the original as well as modified Lacey formula is tested to the data collected from major rivers in Bangladesh.     

Conodonts from the Upper Cambrian Sesong and Hwajeol Formations in the Sabuk Area, South Korea

This paper presents a conodont biostratigraphic study on the Upper Cambrian Sesong and Hwajeol Formations in the Sabuk area, Korea. Two samples near the base of the Sesong Slate at the Pukil section contain lower Upper Cambrian conodonts, comprising Furnishina furnishi, F. kranzae, F. pernical, F. triangulate, Hertzina elongata, Laiwugnathus doidyxus?, Phakelodus elongatus, Muellerodus? obliquus, Westergaardodina matsushitai and W. moessebergensis. This is the first conodont record of the Upper Cambrian formations recovered yet in the northern limb of the Paekunsan syncline. The faunal assemblage is correctable with the lower Upper Cambrian W. matsushitai Zone of North China. Four local biozones are recognized in the Hwajeol Formation, i.e. the Proconodontus, Eoconodontus notchpeakensis, Cambrooistodus minutus and Cordylodus proavus Zones in ascending order. This zonal scheme is essentially equivalent to that of the southern limb of the Paekunsan syncline and they are correlatable with zones in other pa     

WISE EXPLOITATION OF NEWLY GROWING LAND RESOURCES——An Assessment on Land-use Change of Chongming Island Using GIS

1INTRODUCTIONThreewell-documentedmajorglobalchangesaffectinghumanbeingsareincreasingconcentrationofcarbondioxideintheatmosphere,alterationinthebiochemistryoftheglobalnitrogencycle,andon-goinglanduse/coverchange(LUCC)(VITOUSEK,1994).Forcen-turies,humanbeingshavebeenalteringtheearth'ssurfacetoproducetheirfoodandsheltersthroughagri-culturalactivities(REIDetal.,2000).Likeothercountries,Chinaisalsosubjecttolandtransformation,forinstance,abouthalfamillionhectaresofwetlandshavebeenreclaime…