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geographic
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    Division of the late Pleistocene mammalian fauna in North China and its geographic distribution
    中国北方晚更新世哺乳类动物群的划分及其地理分布
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    GEOGRAPHIC VARIATIONS OF MAJOR ELEMENTS FOR PERIDOTITIC XENOLITHS IN RELATION TO CRUST/LITHOSPHERE AGE AND THICKNESS IN EASTERN CHINA
    中国东部Ⅰ型地幔包体主要元素的区域性变化及其与地壳/岩石圈年龄、厚度的关系
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    AN EXAMPLE OF GEOGRAPHIC APPLICATION OF RADIO LEAD ̄((210)Pb)DATING METHOD
    放射性~(210)Pb方法的地理学应用实例
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    A Study on the Characteristics of the Physical Geographic Environment in Xuzhou Low Mountains and Hills
    徐州市低山丘陵区自然地理环境特征分析
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    GEOGRAPHIC ENVIRONMENT CHANGE AND FLOOD CATASTROPHE IN HUAIHE RIVER BASIN DURING LAST 2000 YEARS
    GEOGRAPHIC ENVIRONMENT CHANGE AND FLOOD CATASTROPHE IN HUAIHE RIVER BASIN DURING LAST 2000 YEARS
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  geographic
With geographic information system (GIS), the ecological water requirement for forests in the Jinghe watershed, western China was estimated.
      
Such tendency suggests that the allele frequency in these three loci may be correlated with the species' geographic distributions.
      
Variation in sexual reproduction may strongly affect plant's adaptation to local environments and the evolution of the geographic range.
      
Using the ArcView Geographic Information System (GIS) platform, a case study was carried out by selecting the population of Pinus massoniana from a needle-and broad-leaved mixed forest community in the Heishiding Nature Reserve, Guangdong Province.
      
In this study, remotely sensed data and the geographic information system were applied to analyze the changes in land cover along topographic gradients from 1978 to 2001 in Beijing, a rapidly urbanized mega city in China.
      
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In eastern China Cainozoic basalts are widely distributed, but its gelogical ages are still a problem and discussed among geologists. For that reason two typical sec-tions of basalts located nearby Nanking have been studied by the a. c. demagnetizing technique of rock samples. It is shown that their remanent magnetism seems to be very stable. The rock samples collected from the Fangshan basalt group in district Jiangning give the mean direction of Dr = 195°29', J = - 54°9' with a mean inten-sity of magnetization...

In eastern China Cainozoic basalts are widely distributed, but its gelogical ages are still a problem and discussed among geologists. For that reason two typical sec-tions of basalts located nearby Nanking have been studied by the a. c. demagnetizing technique of rock samples. It is shown that their remanent magnetism seems to be very stable. The rock samples collected from the Fangshan basalt group in district Jiangning give the mean direction of Dr = 195°29', J = - 54°9' with a mean inten-sity of magnetization 8.1 X 10-4 CGSM, corresponding to a palaeomagnetic polar position of λp= 192°35' E, φp = 76°47' N; and the rock samples collected from the Lingyanshan basalt group in district Liuhe give the mean direction of Dr = 354°44', Jr = 42°12' with a mean intensity of magnetization 26.4 X 10-4 CGSM, corresponding to a palaeomagnetic: polar position of λp= 329°38' E, φp = 80°36' N. Based on the above results some conclusions may be obtained as follows:1. The polarity of rocks from the Lingyanshan basalt group is distinctly dif-ferent from that of the Fangshan basalt group. The polarity of the former is nor-mal, possibly comparable with the Brunhes epoch; whereas the polarity of the latter is reversed, comparable with the Matuyama epoch.2. The paleomagnetic polar position obtained from rocks of the Lingyanshan basalt group appears to be nearer to the present geographic pole than that from the Fangshan group, showing the difference of their time eruption, the former was younger than the latter.3. The paleolatitudes in which both the Lingyanshan and Fangshan basalt groups were formed are considered as intermediate latitudes with sub-tropical climate.4. Comparing with the paleomagnetic data for rock ages from various regions of the world and referring to the animal fossils contained in the underlying and overlying beds of this two basalt groups and also the petrological properties, it is more reasonable to consider the geological ages of the Lingyanshan basalt group and the Fangshan basalt group as Q2-Q3 and N2-Q1, respectively.

中国东部广泛分布着新生代的玄武岩,其地质时代始终是一个争议的问题。本文作者对南京附近地区的两个标准玄武岩组剖面进行了古地磁学研究,使用交变场退磁法检验了样品,证明它们的剩磁稳定性良好,测得江宁方山玄武岩组的I,平均值为8.1×10~(-4)CGSM,D_r=195°29′、J_r=-54°9′,古地磁南极位置为λ_P=192°35′E、Φ_P=76°47′N;六合灵岩山玄武岩组的l,平均值为26.4×10~(-4)CGSM,D_r=354°44′,J_r=42°12′,古地磁北极位置为λ_P=329°38′E、Φ_p=80°36′N,并得出如下结论: (1)六合灵岩山玄武岩组和江宁方山玄武岩组的极性截然不同,灵岩山玄武岩组的岩石磁性全系正向,可能相当于布容期(Brunhes epoch),方山玄武岩组的岩石磁性全属反向,可能相当于松山期(Matuyama epoch); (2)灵岩山玄武岩组测得的古北极相距现今的北极要比方山玄武岩组的近一些,清晰地表明它们的形成时间绝非同一时期,而是灵岩山玄武岩组要晚,方山玄武岩组要早; (3)灵岩山玄武岩组和方山玄武岩组形成时期的岩石产地所处的古纬度都是中纬度地区,属亚热带...

中国东部广泛分布着新生代的玄武岩,其地质时代始终是一个争议的问题。本文作者对南京附近地区的两个标准玄武岩组剖面进行了古地磁学研究,使用交变场退磁法检验了样品,证明它们的剩磁稳定性良好,测得江宁方山玄武岩组的I,平均值为8.1×10~(-4)CGSM,D_r=195°29′、J_r=-54°9′,古地磁南极位置为λ_P=192°35′E、Φ_P=76°47′N;六合灵岩山玄武岩组的l,平均值为26.4×10~(-4)CGSM,D_r=354°44′,J_r=42°12′,古地磁北极位置为λ_P=329°38′E、Φ_p=80°36′N,并得出如下结论: (1)六合灵岩山玄武岩组和江宁方山玄武岩组的极性截然不同,灵岩山玄武岩组的岩石磁性全系正向,可能相当于布容期(Brunhes epoch),方山玄武岩组的岩石磁性全属反向,可能相当于松山期(Matuyama epoch); (2)灵岩山玄武岩组测得的古北极相距现今的北极要比方山玄武岩组的近一些,清晰地表明它们的形成时间绝非同一时期,而是灵岩山玄武岩组要晚,方山玄武岩组要早; (3)灵岩山玄武岩组和方山玄武岩组形成时期的岩石产地所处的古纬度都是中纬度地区,属亚热带气候; (4)对比世界各地区一些有关时代的岩石古地磁学数据,参照这两套玄武岩组的上下地层中所含有的古生物化石及岩石学特征,六合灵岩山玄武岩组的地质时代似应为Q_2—Q_3,江宁方?

The Eotvos correction in offshore gravity survey depends on the relationship of ship's navigation positioning data. In order to reach expected accuracy of offshore gravity survey, we must see that the high precision navigation positioning system should be included in the major instruments used in offshore gravity survey except that the essential accuracy of offshore gravity meter is guaranteed. In this paper, examples are given to show how to calculate from navigation positioning data the required variables...

The Eotvos correction in offshore gravity survey depends on the relationship of ship's navigation positioning data. In order to reach expected accuracy of offshore gravity survey, we must see that the high precision navigation positioning system should be included in the major instruments used in offshore gravity survey except that the essential accuracy of offshore gravity meter is guaranteed. In this paper, examples are given to show how to calculate from navigation positioning data the required variables and corresponding RMS errors which are used to work out Eotvos corrections, and the geographic coordinates of every gravity station.

海洋重力测量的厄缶(Eotvos)校正取决于船的导航定位数据间的关系。要想使海洋重力测量成果达到预期的精度,除了保证海洋重力仪的固有精度外,还必须把高精度的导航定位系统列为海洋重力测量的主要仪器设备。文中举例说明如何根据导航定位数据求出所需的用于计算厄缶校正的各个变量和相应的均方误差,以及各个重力测点的地理位置。

This paper is intended to describe some technical points involved in 3D seismic prospecting in south Siehuan, which are the acquisition of 3D seismic data in different geographic and geologic conditions,the effect and limitation of two step migration processing, the interpretation of seiscrop section and the effect of detecting oil by 3D seismic prospecting.

本文主要介绍川南三维地震勘探情况:根据川南地形、地质特点采集三维地震信息;“两步法”偏移处理的效果及局限性;切片图的解释及进行油气检测的效果。

 
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