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africa
相关语句
  非洲
    IN OUZZAL GRANULTIC TERRANE IN NORTH -WEST AFRICA
    非洲西北部的In Ouzzal麻粒岩带
短句来源
    PLATE MOTION RELATIVE TO AFRICA
    相对非洲的板块运动
短句来源
    Mechanism of Forming High Porosity and Permeability Reservoir in Muglad Basin of Africa
    非洲Muglad盆地高孔高渗储层成因机制探讨
短句来源
    With an area of 11.2×10 4 km 2 , M Basin is one of the biggest oil & gas basins in Africa. The basin deposits Cretaceous sedimentary rocks and the newer with maximum deposition thickness over 10 km.
    M盆地是非洲较大的含油气盆地之一 ,盆地面积 11.2× 10 4km2 ,沉积了白垩系及以上地层 ,最大沉积岩厚度大于 10km。
短句来源
    COMPARISON OF CRANIAL FEATURES BETWEENEARLY HOMO SAPIENS OF CHINA AND AFRICA
    中国和非洲古老型智人颅骨特征的比较
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  “africa”译为未确定词的双语例句
    ON THE EFFECT OF CLIMATE ON DESERTIFICATION IN SAHEL,WEST AFRICA──With Diccussion on the Effect of Human Activities
    论气候在西非萨赫勒地带荒漠化中的作用──兼谈近期人类活动的影响
短句来源
    REGIONAL GEOCHEMICAL SURVEY OF Pt,Pd AND Au IN THE WESTERN BUSHVELD COMPLEX,SOUTH AFRICA
    南非西布什维尔德杂岩体铂、钯、金区域地球化学测量
短句来源
    Source rock evaluation and crude oil geochemi-stry in the Fula Depression, M-Basin, East Africa
    东非M盆地福拉凹陷烃源岩及原油地球化学特征
短句来源
    Determination of Cobalt Content in Cobalt Concentrates form South Africa
    南非钴精矿中钴量的测定
短句来源
    Tectonic evolution and its control on hydrocarbon accumulation in West Africa
    西非构造演化及其对油气成藏的控制作用
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  africa
Genetic relationships were studied among 23 isolates of Sphaeropsis sapinea collected from China, the United States, England, South Africa and Chile by using a random amplification of a polymorphic DNA (RAPD) analytical method.
      
Restriction endonucleases (RENs) were detected in 650 microbial strains isolated from water columns and bottom sediments of deep rift lakes, Baikal (Russia) and Nyasa (Southeastern Africa).
      
During the first period, the primary natural foci in Eurasia were formed and, during the second period, synanthropic (rat) and secondary natural foci appeared with the participation of humans in Africa, The New World, and on some tropical islands.
      
Identification and Genesis of the Mixed-Layer Lizardite-Saponite Phase in a Kimberlite Pipe, South Africa
      
In autolithic breccia of a kimberlite pipe in South Africa, the ordered mixed-layer lizardite-saponite phase was first identified in rocks containing a mechanical mixture of lizardite and saponite or only saponite in association with lizardite.
      
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The phase velocities of Rayleigh waves in China were obtained by using the seis- mograms from twelve stations in China.Two earthquakes from New Britain Islands were chosen.The amplitudes of Rayleigh Waves with the period of about 35 seconds are considerably smaller than their following phases with shorter periods.This particular feature of the seismograms can be traced from most of the stations.It makes the cor- relation more feasible.Detailed correlations are obtained by analyzing the variation of periods with...

The phase velocities of Rayleigh waves in China were obtained by using the seis- mograms from twelve stations in China.Two earthquakes from New Britain Islands were chosen.The amplitudes of Rayleigh Waves with the period of about 35 seconds are considerably smaller than their following phases with shorter periods.This particular feature of the seismograms can be traced from most of the stations.It makes the cor- relation more feasible.Detailed correlations are obtained by analyzing the variation of periods with distances and also the arrival times of each crest of Rayleigh waves in the seismograms.The phase velocities of separate regions as computed from two different earthquakes are in good agreement.The results show that in calculating the phase velo- cities with tripartite method,the corrections due to different oceanic paths can not be neglected if the angular distances between them were great.Because the parameters of the earth crust in China are not well-known,we have to compare these calculated phase velocities of Rayleigh waves in China with the revised phase velocity nomograms of Rayleigh waves by Press,based on the materials obtained in Africa.The crust thick- nesses in separate regions are thus computed,the results being merely tentative.How- ever,unless more geophysical data were available,these data as given by this method still show a rather close correlation with the principal tectonic features in China.In the region of Tibetan Plateau,the phase velocities are very low,and the calculated thick- ness of the earth crust there is 74 kms;whereas in the region of southeastern coast,the phase velocities are high,and the calculated thickness is only 20 kms.

本文利用新不列颠岛两个地震在十二个基本台站所记录到的瑞利波,计算了我国不同地区的相速度.着重讨论鉴别和对比不同台站记录中同一震相的方法.在大部分台站的记录中,见到有周期约为35秒的相位,和后面的位相比较,它的周期较大,振幅较小.波形的对比对初步鉴别震相有很大的帮助.详细的震相对比是根据周期随距离变化的规律和各震相到时的规律.两个地震所得的相速度很符合.计算的结果表明:利用三台计算相速度时,如果射线的路程差别较大,海洋路程的校正是不能忽略的.因为有关我国地壳构造的资料还很少,我们所得的瑞利波相速度只能与普瑞司修正后非洲大陆的相速度理论相比较,由此得到我国不同地区的地壳厚度.这样所得的厚度,虽然不能视为最后的结果,但是它们仍然表现与主要地质单元之间有密切的联系.

In the present paper dealing with the paleogeography of Sinkiang in the late geological time more attention has been paid to the shifting of the climatic zones and notable climatic changes as well as to its general tendency of development. Such changes were considered mainly due to the intensive tectonic movements and influences of the Quarternary glaciation. It was suggested that during Cretacious and Tertiary the tectonic movement was fairly weak, and the raised mountains were levelled off by peneplanation....

In the present paper dealing with the paleogeography of Sinkiang in the late geological time more attention has been paid to the shifting of the climatic zones and notable climatic changes as well as to its general tendency of development. Such changes were considered mainly due to the intensive tectonic movements and influences of the Quarternary glaciation. It was suggested that during Cretacious and Tertiary the tectonic movement was fairly weak, and the raised mountains were levelled off by peneplanation. On the western side of the country was the site of the great Tethys Sea where warm currents drifted. Through these, the planetary system of air circulation of Sinkiang at that time was quite similar to that of the Area between to-day's west Europe and North Africa; the climatical zcnation was also alike.

本文探討新疆最近地質时期的古地理,特别注意到气候带的移位和巨大气候变化及其总的发展趋势。这些变化主要是从强烈的构从运动和冰川作用来考虑的。至于由其他因素所引起較小周期性的气候变化这里暫不予討論。新疆在白堊纪,老第三纪时期构造作用微弱,隆起的山地逐漸被夷平,西部有暖流进出古地中海,极地沒有冰盖,因此大气环流形势近似今日西欧和北非之間的环流系統。喜馬拉亚运动开始以后,古地中海消失而为新期褶皺山脉所代替,欧亚大陆联成一片,逐漸建立起东亚新的季风环流系統。新疆冬季受到蒙古—西伯利亚高压的影响,許多地方轉向干寒气候方向发展。

Paleoceanography studies paleoenvironment and historical evolution of the present oceans and that part of continents which had been a part of ocean in the geological past.The present paper deals with paleoceanography of a classical ancient ocean in the continent—the Alps since the Mesozoic. It is based on the analysis of literature and authors' brief field excursions in the Alps in 1982 and 1983 when typical exposures were examined.The rifting between Europe and Africa began in the earliest Jurassic when...

Paleoceanography studies paleoenvironment and historical evolution of the present oceans and that part of continents which had been a part of ocean in the geological past.The present paper deals with paleoceanography of a classical ancient ocean in the continent—the Alps since the Mesozoic. It is based on the analysis of literature and authors' brief field excursions in the Alps in 1982 and 1983 when typical exposures were examined.The rifting between Europe and Africa began in the earliest Jurassic when dolomite was deposited under supratidal, intertidal and partly subtidal environment. Breccias filling crevasses in earliest Jurassic and upper Triassic dolomite in Arzo Quarry, Chiasso (south Switzerland) and other localities have important paleoceanographic significance. These crevasses are probably submarine karst and breccias were formed by submarine erosion of younger formations.Ammonitico rosso, Radiolarite and Maiolica limestone are three important pelagic sediments in the Alps, ranging in age from Jurassic to early Cretaceous. Ammonitico rosso, the earliest sediment in the Tethys, is formed by submarine cementation, indicating the existence of a strong bottom current in that time. With progress of rifting, ocean crust was exposed and typical oceanic ultrabasic rocks may be found in many localities which are often overlain by Radiolarite. The widespread deposition of radiolarite shows that, with opening of a passage to the Indian-Pacific Ocean in the east, there was a boom of Radiolaria in the Tethys. Maiolica limestone of lower Cretaceous is a white, pelagic limestone deposited below calcite lysoline. Therefore, pelagic sequence in the Tethys of southern Alps is Ammonitico rosso-radiolarite-Maiolica which is different from the plate stratigraphy model of the Pacific.Thick sequence of turbidites is found in the southern Alps. They range in age from upper Cretaceous to Eocene. A distinct erosional unconformity and hiatus can be seen between the upper Cretaceous and Paleogene, indicating strengthening of bottom current in that time. numerous intercalations of catastrophic debris flow layers in turbidites show that during the deposition of turbidite, submarine slides and falls were frequent.

《欧洲阿尔卑斯山古海洋学的探索》一文系学部委员任美锷教授所著,作者1937年、1982年和1983年三次赴欧洲瑞士考察和讲学,实地考察了阿尔卑斯山的中部、东部和其他地区的地质地貌,还参加了第一届国际古海洋学会议和会后的地质旅行,考察了南阿尔卑斯山的地质构造和古海洋的演变过程。本文主要从海洋学观点阐述阿尔卑斯山系的地质演化过程,文章内容新颖,论断严谨,不失为一篇地质学佳作。

 
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