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recent sediments
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  现代沉积物
     Vertical Distribution of ~ (210)Pb and ~ (137)Cs and Their Dating in Recent Sediments of Lugu Lake and Erhai Lake, Yunnan Province
     云南省泸沽湖、洱海现代沉积物中~(210)Pb,~(137)Cs的垂直分布及其计年
短句来源
     A recent sediment section 0.86m long if from the East Lake in Wuhan City, was used to study the magnetic anisotropy of lacustrine recent sediments.
     采自武汉东湖现代沉积物的 0 .86m长的样品被用于研究湖泊现代沉积物的磁性各向异性。
短句来源
     A GEOCHRONOLOGICAL STUDY OF ~(210)Pb CF MODEL FOR THE RECENT SEDIMENTS OF DIANCHI LAKE, YUNNAN PROVINCE
     云南滇池现代沉积物~(210)Pb法的CF模式年龄研究
短句来源
     Composition and Sedimentary Environment of Recent Sediments of the Futou River on Plain Reach
     滹沱河平原段现代沉积物的成分与沉积环境
短句来源
     Characteristics of Magnetic Fabrics of Recent Sediments in the East Lake, Wuhan
     武汉东湖现代沉积物磁组构特征及意义
短句来源
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  近代沉积物
     The very abundant highly branched isoprenoid (HBI) alkenes (C20,C25 and C30) have been detected in four cores of Qinghai Lake recent sediments.
     在青海湖不同盐度的四孔近代沉积物岩芯(Q-16A,QH,QE和QG)(图1)抽提物支链和环烷烃组分中检出了非常丰富的C20,C25和C30高度支链类异戊二烯烯烃(highlybranchedisoprenoidalkenes),简称HBI烯烃。
短句来源
     Sedimentary chemical characteristics of recent sediments in Huanghe,Changjiang and Zhujiang Rivers Deltas
     黄河、长江和珠江三角洲近代沉积物的沉积化学特征
短句来源
     Palaeomagnetic and Palaeoenvironmental Studies on Recent Sediments from the Bohai Sea, China
     渤海近代沉积物的古地磁与古环境研究
短句来源
     Vertical Distribution of Dinoflagellate Resting Cysts in Recent Sediments from Zhelin Bay, the South China Sea
     柘林湾近代沉积物中甲藻孢囊的垂直分布
短句来源
     PALEOLIMNOLOGY OF RECENT SEDIMENTS IN YANGCHENG LAKE
     阳澄湖近代沉积物的古湖泊学研究
短句来源
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  “recent sediments”译为未确定词的双语例句
     The  ̄(137)Cs and  ̄(210)Pb_(ex) techniques are widely employed for dating recent sediments oflakes.
      ̄(137)C及 ̄(210)Pb_(ex)方法广泛应用于湖泊现代沉积计年。
短句来源
     DISTRIBUTION AND DATING OF ~(137)Cs FOR RECENT SEDIMENTS IN LAKE GREIFEN (SWITZERLAND)
     瑞士Greifen湖新近沉积物中的~(137)Cs分布及其计年
短句来源
     Ten genera of calcareous nanofossils (Coccolithus,Reticulofenestra, Cyclicargolithus, Quadrum,Discoaster,Gephyrocapsa,Calcidiscus, Umbilicasphaera, Cotonocyclus, Watznaueria) have been found in 38 samples collected from 15 locations in Cenozoic Recent sediments of terrestrial salinized lakes in the northwest and northeast China by analysing 433 samples from 36 places. It was found that most of them were sedimentary deposits and a few of them resedimentary ones.
     对我国西北和东北 (内蒙古东部 ) 36个地点的新生代—现代陆相咸化湖泊沉积中的 4 33块标本进行了采样分析 ,在其中 15个地点 38块标本中发现钙质超微化石 10个属 :Coccolithus,Reticulofenestra,Cyclicargolithus,Quadrum ,Discoaster,Gephyrocapsa ,Calcidiscus,Umbilicasphaera ,Cotonocyclus,Watznaueria等 ,多数为原地沉积 ,也有一部分属于再沉积来源。
短句来源
     In order to correct or avoid these errors, a mathematical model used for correcting deep transfer of 137Cs in the watery recent sediments has been put forward by the authors.
     为了纠正或校正这种误差,结合我们的研究工作实际,提出了一个用于校正~(137)Cs在水体沉积物中纵向迁移的数学模型。
短句来源
     Results show that the recent sediments are mainly fine-grained composing 90% of silt and clay.
     研究结果表明,乐清湾现代沉积主要以细颗粒沉降为主,粉沙和粘土总含量占90%以上;
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  recent sediments
The distribution of clay minerals in recent sediments on the Arctic shelf off the Eurasian and North American continents is considered.
      
The Composition of Phosphatized Bones in Recent Sediments
      
Facies Variability of Recent Sediments in the Hornsunn Fjord, Western Spitsbergen
      
The model of recent sedimentation in the fjord is proposed based on the analysis of grain-size distribution, petrographic-mineralogical composition, physical properties of recent sediments, and benthic foraminiferal communities therein.
      
Clay minerals in recent sediments of the World Ocean and their relation to types of lithogenesis
      
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Acoustic meter of Model GPY is a new remote sensing tool which is developed with special regard to the characteristics of the lakes of China. It would quickly give a general idea about the spacial spreading of the strata under the lake. Using it for three times, we made a survey on the sub-strata of Tai-Lake, with the profile lines over 200km. Preliminary survey reveals that Tai-Lake is a shallow lake with average water depth less than 2m. The substrata, consisting of loessial material, is overlain with recent...

Acoustic meter of Model GPY is a new remote sensing tool which is developed with special regard to the characteristics of the lakes of China. It would quickly give a general idea about the spacial spreading of the strata under the lake. Using it for three times, we made a survey on the sub-strata of Tai-Lake, with the profile lines over 200km. Preliminary survey reveals that Tai-Lake is a shallow lake with average water depth less than 2m. The substrata, consisting of loessial material, is overlain with recent sediments of several to tens of centimeters in thickness , and underlain by marine sediment of sand and clay interbeds formed during late Pleistocene time ( 21000-21000 yrs ago ) . Under the marine sediments, there are brown and grey clays. All the evidences indicate that the alluvial plain extensively covered with loess was prevailing in that time. It was not resulted from a bay and lagoon environment. Over the loessial beds, many river courses and small sags are discovered. Furthermore, many ancient buried hills are also found,suggesting that the basement is not flat . Finally, it is found that shallow natural gas is distributed in near - surface beds of Tai-Lake, which is continuously escaping along errosion valley.

GPY型浅地层剖面仪是结合我国湖泊特点而研制的新型声学遥测仪器,可以迅速提供湖底地层空间展布概况。我们运用这一仪器,曾三次对太湖底质进行了探测,测线达200余公里,初步揭露了太湖是一个平均水深不到2m的浅水湖泊,湖底由坚硬的黄土物质所组成,其上覆盖着数厘米至数十厘米的现代沉积,黄土层之下为砂、泥互层的海相沉积,时代为晚更新世(距今约2.1—2.4万年),该沉层积之下则为棕色及灰色粘土层。这表明,在太湖形成之前这里曾是广泛覆盖着黄土的冲积平原环境,并非是由海湾和泻湖演变而来。黄土层之上,还发现有许多被淹埋的河道及小洼地。通过探测,也揭露了太湖沉积层中有许多埋藏的古潜山,表明它的基底并非是一个平坦的湖盆地地形。此外,还发现太湖底部地层中有浅层天然气分布,并且不断地沿着侵蚀沟谷向外逸出。

As early as the beginning of this century, there were divergent views on whether a large ice sheet covered the whole Qinghal-Xizang Plateau in the Quaternary glacial period. Hedin Sven (1899—1902), Luo Laixing et al. (1963), Cui Zhijiu (1964) and Zhen Benxing et al. (1976, 1979) considered that no large ice sheet formed on the Plateau. But E. Trinkler (1930) and V. M. Sinitsun (1958) belived that the whole Plateau was covered by a large ice sheet in the Quaternaty glacial period.Since 1981, M. Kuhle, a F. R....

As early as the beginning of this century, there were divergent views on whether a large ice sheet covered the whole Qinghal-Xizang Plateau in the Quaternary glacial period. Hedin Sven (1899—1902), Luo Laixing et al. (1963), Cui Zhijiu (1964) and Zhen Benxing et al. (1976, 1979) considered that no large ice sheet formed on the Plateau. But E. Trinkler (1930) and V. M. Sinitsun (1958) belived that the whole Plateau was covered by a large ice sheet in the Quaternaty glacial period.Since 1981, M. Kuhle, a F. R. G. geomorphologist has several times argued with Chinese soientists that a large ice sheet existed on the Qinghai-Xizang Plateau, thus causing concerns about this problem in the circles of geoscience both at home and abroad. The main divergence of the two different views lies in the different understanding of the sediments, sedimentary sequences and landform on the plateau. Large amount of recent sediments and geomorpho-logical study show that most of the deposits regarded, as moraines and which were used to reconstruct very low paleosnowlines and extensive ice sheets are actually debris flow and slope wash-related deposits. Real glacial, deposits are not widespread on th Plateau and an extensive ice sheet did not develop.

关于青藏高原在第四纪大冰期时,是否发生过覆盖整个高原的大冰盖这一问题,早在二十世纪初就出现了分歧。斯文赫丁(1899—1902),罗来兴等(1963)、崔之久(1964)、郑本兴等(1976,1979)认为在青藏高原上没有形成大冰盖,但E.涂宁克尔(1930)、B.M.西尼村(1958)认为在大冰期时,整个高原被大冰盖覆盖着。自1985年至今,西德地貌学家M.库勒多次与中国学者辩论,认为在青藏高原发生过大冰盖,从而在国内外地学界引起了对这一问题的关切。两种观点的主要分歧点在于对高原上的沉积物、沉积序列和地貌认识不一致。大量的现代沉积和地貌调查研究表明,多数被视为冰碛物,并用此重建很低的古雪线和大冰盖,实际上是泥石流和坡积类沉积。真正的冰川沉积物并未遍布于高原上,也没有发育大冰盖。

210Pb geochronology has been widely applied to dating recent sediments in lakes, estuaries, and coastal marine environments. In this paper, the Constant Flux of Supply model (CF) has been applied to calculating the ages and sedimentation rates of two sediment cores from Dianchi Lake, Yunnan Province, in comparison with generally used Constant Activity model (CA). The CA and CF models have given quite different predictions of the ages of sediment sections for these two cores. Meanwhile, the...

210Pb geochronology has been widely applied to dating recent sediments in lakes, estuaries, and coastal marine environments. In this paper, the Constant Flux of Supply model (CF) has been applied to calculating the ages and sedimentation rates of two sediment cores from Dianchi Lake, Yunnan Province, in comparison with generally used Constant Activity model (CA). The CA and CF models have given quite different predictions of the ages of sediment sections for these two cores. Meanwhile, the results of 228Th/232Th method and 239,240Pu distribution are consistent with the CF age and show some difference from the CA age. The CF model indicates that the sedimentation rates of Dianchi Lake were variable during the past 100 years, ranging from 140 mg/cm2/a to 225 mg/cm2/a. It is likely that the longterm variation in sedimentation rate is due to both natural and artificial processes.

本文阐述了~(210)Pb法的CF模式年龄计算原理,并用此模式计算了云南滇池沉积柱样的年龄。发现CF模式年龄与普通的CA模式年龄有明显的差异,而~(228)Th/~(232)Th法和~(239,240)Pu分布都表明CF模式年龄是可靠的。此年龄结果显示了近一百年来滇池的沉积通量是变化的。

 
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