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the northwest china
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  西北地区
     The results show that the S value synthetical information during the period of May 1986 to March 2005,10 earthquakes with MS≥5.0 in the Northwest China region appears very high anomaly(S=0.154).
     结果表明,S值综合信息量时序曲线在西北地区1986年5月至2005年3月间的10次MS≥5.0地震震前均出现不同程度的高值异常(S≥0.154)。
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     Analysis of the Interactive Relations Between Urbanization and Living Quality of Residents in the Northwest China
     城市化与西北地区居民生活质量的互动关系分析
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     Analysis of interactive relations between urbanization and economic development in the Northwest China
     城市化与西北地区经济发展的互动关系分析
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     The Main Problem of Human Capital in the Northwest China on Sustainable Economic Development
     西北地区经济可持续发展的主要人力资本问题
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     Arid Features and Cause Analyses of the Northwest China in the Summer of 2004
     西北地区2004年夏旱特征和成因分析
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  中国西北地区
     Advection and convergence of water vapor transport over the northwest China
     中国西北地区水汽的平流输送和辐合输送
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     Arid Climate and the Regulation of the Hydrotherma Resources in the Northwest China
     中国西北地区的干旱气候及水热资源的调节
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     Atmospheric water vapor transport from westerly and monsoon over the Northwest China
     西风带与季风对中国西北地区的水汽输送
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     In this paper, we carry out our coalbed methane enrichment experiments using low rank coal sampled from the Northwest china. Our experiment results testify that the existence of commercial biogenic gas in northwest coal basin is really possible and it is favorable for exploration in basins with high coalbed-thickness and high resource concentration.
     通过本次采用FY-Ⅱ型煤层气成藏模拟装置和西北低煤阶含煤盆地的煤岩样品开展了低煤阶生物成因的煤层气成藏模拟,从实验角度证明了中国西北地区虽然煤层煤阶较低,热成因气较少,但是却存在着具有商业价值的二次生物成因的甲烷气,再加上含煤层系众多,煤层厚度大,资源丰度极高,仍具有巨大的勘探潜力.
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     THE ASYMMETRIC CHANGE OF MAXIMUM AND MINIMUM TEMPERATURE IN THE NORTHWEST CHINA
     中国西北地区最高、最低气温的非对称变化
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     Great Development and Ecological Environmental Problems in the Northwest China
     西北大开发与生态环境问题
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     A Comprehensive Measure of the Present Situation of Circular Economy in the Five Provinces of the Northwest China
     西北五省区循环经济发展现状的综合测度
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     The Religious Characteristic of the Music Culture of the Hui Minority in the Northwest China
     略论中国西北穆斯林音乐文化——以回族音乐为例
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     Review the influence of dust-sand weather indicated that the city ambient air quality in the north China especially in the northwest China was seriously influenced by dust-storms and PM_(10) was the main pollutant in these areas.
     同时分析沙尘天气对我国城市空气质量的影响表明,我国北方城市尤其是西北城市,受沙尘天气的影响比较大,PM10污染相对严重。
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     Anlysis on Extreme Precipitation Envent over the Northwest China in Flood Season
     中国西北汛期极端降水事件分析
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  the northwest china
The fractal relationship also exists between the frequency and the scales of earthquakes during the last five centuries and the fractal dimension is 1.30 for the whole continental region of China and 1.08 for the northwest China.
      
It is found that fractal relationship exists between the frequency and the length of the active faults, and the fractal dimension is 1.70 in the continental region of China, and 1.40 in the northwest China.
      
In the coming 50 years, water demand for agriculture will be increased by 5.6×109m3 in the Huanghe (Yellow) River valley, and by 1.7× 109m3 in the Northwest China.
      
Judged by the data the Little Ice Age of the Northwest China is later than the eastern China and Europe.
      
Agricultural reclamation policy and environmental changes in the northwest China during the Qing dynasty
      
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Selenium is an essential trace elenint to animal and man, but abnormal content (deficiency or excess) of selenium in environment is harmful. Selenium in environment has an influence on animal and man by means of biogeochemical food chain, rock-soil and water-plant-animal and man. Grain is the key link of them.This paper studies geographical distribution of selenium content of grains (wheat, corn and rice) in China and its relation to geographical epidemic of white muscle disease of animal and kashin disease...

Selenium is an essential trace elenint to animal and man, but abnormal content (deficiency or excess) of selenium in environment is harmful. Selenium in environment has an influence on animal and man by means of biogeochemical food chain, rock-soil and water-plant-animal and man. Grain is the key link of them.This paper studies geographical distribution of selenium content of grains (wheat, corn and rice) in China and its relation to geographical epidemic of white muscle disease of animal and kashin disease and Kaschin-Beck's disease of man, which are endemics with relation to selenium deficiency in environment, by the method of statistical plotting.Statistics shows that frenquency distribution of selenium content of grains belongs to the approximate longnormal distribution. Therefore, according to' classifica-iton of equal ratio,different selenium content of grains is sorted out into three classes; high, medium and low, and a distribution map of selemium content degree of grains in China has been plotted. As shown in the map, grains containing high selenium mainly grow in the Northwestern part of China, next in Enshi county in Hu-bei province and Ziiyang county in Shaanxi province (There are areas in these two counties where selenium toxicosis occurs in livestock and man). Grains containing medium selenium are distributed in Southeast China, Northwest China and Northeast China plain, North China plain, Fenhe basin, Weibe plain and Sichuan basin. Grains containing low seleniumare distributed in the Lesser Hinggan Mountains, the Changbai Mountains, the Luzhong Mountains, the Loess plateau, the Qinling Mountains, the Daba Mountains, the eastern part of the Qinghai-Tibet plateau and the Qaidam Basin. It is outlined that low selenium zone is mostly distributed in mountainous and hilly regions in the so-called transition zone situated between the dry desert and steppe zone of the Northwest China and humid-hot evergreen forest zone of the Southeast China.Geographical distribution of the above-mentioned three endemics is fundamentally in accordance with that of grains containing low selenium. A difference of selenium mean content of grains between endemic areas and nonedemic areas is statistically very significant.

本文应用多重正态分布理论,将粮食硒含量分成三级,编制中国粮食硒含量等级分布图,并且分析了我国粮食硒含量地域分异的主要原因。

The Linhe Region is prospective for oil.Because the most of the surface were co- rvered by very thick quternary deserts and losses,the sequence of systematic sedi- ments was unknown in the past.To solve this problem is urgent for the present exploration. In this paper,based on the seismic data and deep drilling wells in last two yea- rs,the lithological characters and fossil assemblages was identified,and it is sure that the Cenozoic strata are well developed with large thickness of sediments. The sequence of...

The Linhe Region is prospective for oil.Because the most of the surface were co- rvered by very thick quternary deserts and losses,the sequence of systematic sedi- ments was unknown in the past.To solve this problem is urgent for the present exploration. In this paper,based on the seismic data and deep drilling wells in last two yea- rs,the lithological characters and fossil assemblages was identified,and it is sure that the Cenozoic strata are well developed with large thickness of sediments. The sequence of strata from the upper to the lower is subdivided as follows:Qu- aternary Hetao group.(Q_(1-4)h);Neogene Pliocene Wulantuke formation(N_2 wt);Mi- ocene Wuyuan formation(N_1 wy);Paleogene Oligocene Linhe formation(E_3 J)and Eocene Wulate formation(E_2 wl).This subdivision has been widely correlated with Cenozoic strata of the Northwest China and the North China.Therefore the strati- graphy of Linhe Region has been established.

临河地区是具有石油勘探远景的地区。以往由于表层第四系沙漠黄土覆盖较厚,系统沉积层序一直未被揭露。本文根据近两年地震普查和深参数井钻探资料,通过岩矿特征和化石组合研究认为:该区新生界发育全、沉积厚,地层层序自上而下可分为第四系河套群(Q_(1-4)h);上第三系上新统乌兰图克组(N_2wt),中新统五原组(N_1wy);下第三系渐新统临河组(E_3l),始新统乌拉特组(E_2wl)。并可与我国西北区和华北区新生代地层进行区域对比,为该区勘探工作奠定了地层基础。

The retrospect of the history of desert research and the processes of the formation of desertology since the founding of the People's Republic of China is detailly described in the study. From 1959-1961,the Desert Control Group of Academia Sinica Was established and a great number of scientists were organized to make comprehensive, surveys concerning the geomorphology, climate, hydrology, soil, vegetaiton and social-economic problems in main deserts in China,Taklimakan Desert is one of that,by the...

The retrospect of the history of desert research and the processes of the formation of desertology since the founding of the People's Republic of China is detailly described in the study. From 1959-1961,the Desert Control Group of Academia Sinica Was established and a great number of scientists were organized to make comprehensive, surveys concerning the geomorphology, climate, hydrology, soil, vegetaiton and social-economic problems in main deserts in China,Taklimakan Desert is one of that,by the headquarter of Academia Sinica,Meanwhile , six intergrated experimental stations and more than ten central stations were established in five provinces in the Northwest China and Inner Mongolia. A network on desert studies and experi-ments was initially formed in desert areas in the Northern China.1962-1966, some typical studies were started to conduct in the fixed and semifixed positons. Since 1977, desert studies in the Institute w,ere Put into a new stage, namely, the Problem of desertification is regarded as an important aspect on desert research in China, and the characteristics, the processes and the developmental trends of desertification and its Prevention arc initiated to be conducted; the rational development and utilization of agricultural resourees in desert areas and the environment changes under the destruction of ecosystem are the key programmes during the stage. Desertology, a new developing sciences, is gradually coming to be developed in meetng of the needs of national economic development on the basis of the theoretical systems of geography, agriculture, forestry, animal husbandry and biology under the up-to-date theoretical guidances of the svstematization and the ecology.

1959—1961年中国科学院成立治沙队,组织了科技工作者对我国塔克拉玛干等大沙漠地区的地貌、气候、水文、土壤、植被、社会经济进行了综合考察,在这期限,内蒙及西北五省(区)建立了6个综合试验站,数十个中心站,初步形成了我国北方沙区科研试验網。1962—1966年,沙漠研究开始进行定位与半定位的一些专题性研究。1977年以后,沙漠研究进入了新的发展阶段,沙漠化问题列为我国沙漠研究的重要内容,开始研究我国沙漠与沙漠化土地的特征、演变过程、发展趋势及其防治;沙区农业资源开发利用与环境变化为重点课题。一门新兴学科——沙漠学在结合国民经济发展的需要中,在原有地理学,农、林、牧、生物学的理论体系的基础上,接受当前系统学和生态学的理论指导,正在逐步发展。

 
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