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cold regions environment
相关语句
  寒区环境
     Laboratory of Ice Core and Cold Regions Environment: Retrospect and Prospect
     冰芯与寒区环境开放研究实验室的回顾与展望(英文)
短句来源
     The Laboratory of the Ice Core and Cold Regions Environment: Retrospect and Prospect
     冰芯与寒区环境开放研究实验室的回顾与展望
短句来源
     The history and the present situation of the international and domestic studies on ice cores are reviewed in this paper The summary of the Laboratory of Ice Core and Cold Regions Environment is given in two aspects: 1) hardware, such as establishing of the laboratory and equipment; 2) software, such as stuff in the laboratory At present, there are three research field: 1) The interaction processes between glacier and atmosphere;
     对国际和国内冰芯研究的历史与现状,以及冰芯与寒区环境开放研究实验室的硬件(基础建设和仪器设备)和软件(科研力量)方面进行了简介目前冰芯与寒区环境开研究实验室的三大研究领域为:1)冰川与大气相互作用过程研究;
短句来源
  相似匹配句对
     Cold Regions in China
     中国寒区分布探讨
短句来源
     In cold temperate regions, D.
     在寒温带 ,D .
短句来源
     Ancient DNA in Cold Environment Regions——A Review
     寒区环境中的古DNA分子
短句来源
     The Laboratory of the Ice Core and Cold Regions Environment: Retrospect and Prospect
     冰芯与寒区环境开放研究实验室的回顾与展望
短句来源
     Laboratory of Ice Core and Cold Regions Environment: Retrospect and Prospect
     冰芯与寒区环境开放研究实验室的回顾与展望(英文)
短句来源
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Permafrost regions presently occupy some 2 150 000km2 or 22.4 % of the Chinese territory. Statistics shows that the mean annual air temperature in these regions decreases northwards, eastwards and upwards. In Northeast China, the latitude isthe most significant factor that influences the spatial distribution of air temperature; the altitude is the second. Thus, the distribution of permafrost reveals mainly a latitudinal zonation: the mean annual temperature of permafrost decreases from 0-1℃ at the...

Permafrost regions presently occupy some 2 150 000km2 or 22.4 % of the Chinese territory. Statistics shows that the mean annual air temperature in these regions decreases northwards, eastwards and upwards. In Northeast China, the latitude isthe most significant factor that influences the spatial distribution of air temperature; the altitude is the second. Thus, the distribution of permafrost reveals mainly a latitudinal zonation: the mean annual temperature of permafrost decreases from 0-1℃ at the southern limit down to -2.5℃ (locally -4.2℃) at the north. Correspondingly, the permafrost inceases in thickness from 5-20m to 50-100m, even or more, and varies from sporadic to continuous. In West China, i. e., Xinjiang andthe Qinghai-Xizang(Tibet) Plateau, the altitudinal factor becomes decisive, and the latitudinal one-the second. Thus the development and distribution of permafrost depends mainly upon altitude: it becomes colder, thicker and more stable with rising elevation. The fact that the lower limit of mountain permafrost decends northwards and eastwards must be related to the decrease of the mean annual air temperaturein the same directions. ' The distribution of permafrost has had a considerable change since the Late Pleistocene. In Northeast China, tEe southern limit of permafrost extended to 4142°N during the Last Glaciation Maximum. This could be proved by widely distributed ice-wedge casts and sand-wedges. In the hypsithermal interval of Early Holocene, the southern limit retreated northwards up to 50°N. Inactive ice-wedges found in Wuma show that the permafrost formed in Late Pleistocene remains in the northern Dahingganling Mountains today. Again, inactive ice-wedges found at Yitulihe indicates that there was a colder time of enlarging permafrost during the Middle Holocene. In Mt. Tianshan, the quatz-feldspar coefficient K in sediments shows that thelower limit of mountain permafrost has risen by 900-1000m since Late Pleistocene. Research on buried frozen humus soils reveals that the upper reaches of the Urumqi River has been a rather stable periglacial environment since Holocene, accompanied with the formation syngenetic of permafrost in some swampy lowlands. Iap the Qinghai-Xizang Plateau there are some ice-wedges formed in the coldest stage of Late Pleistocene to be found. At this stage the lower limit of permafrost was 800-l 000m lower than that at present. Since Holocene, the lower limit of permafrost at the fringe of the plateau has risen to some extent. The data of loess susceptibility suggest some fluctuation of climate and some change of permafrost distribution in the plateau. However, the main part of the plateau was still in a periglacial environment. In comparison, from of the Last Glaciation Maximum on, the southern limit of permafrost has retreated northwards by latitudes of 23--24" in northern Europe, 16"to 18" in North America and only 6--8o in East and Northeast China. In (West China, the lower limit of mountain permafrost has risen several hundred meters vertically but moved by several tens of kilometers horizontally.As to the further research, it is suggested that two transects be arranged along 120"E and 90"E, and then excavations and deep borehole drilling be carried out along them to investigate the distribution, composition and structure of frozen ground, to monitor ground temperature and to extract other information stratigraphical, biological, geochemical and gas-geochemical. All of these studies will be helpful to the reconstruction of the paleoclimate and the development history of permafrost, to the evaluation of the stability of frozen ground and to the prediction of the response of cold region environment to the blobal climatic chance.

中国多年冻土区的总面积约占中国陆地面积的22.4%,达2150000km2。多年冻土的分布特征受气候条件在三度空间的变化所制约。自晚更新世以来,其分布情况已有相当的变化。在东次冰期最盛期,东北地区多年冻土南界曾推进到北纬41—42°,在全新世暖期,南界向北退缩,但晚更新世形成的冰楔和多年冻土至今仍存在于大兴安岭北部,全新世中期严寒期冻土有所扩展并形成冰楔。随着气候变化,中国西部高山和高原区高海拔冻土的分布下界已上移800—1000m,但高山和高原的主要部分仍处于冰缘环境,有的地方在全新世还发育了共生型多年冻土。

The regeneration mechanisms of gold placers in permafrost is an international pioneering issue For the first time, this paper presents the dynamic characteristics of Au(Ⅲ), Au(0) contents and salinity in different valence gold-bearing NaCl solutions under uniaxial freezing During the freezing, salting out makes gold and saline ions greatly migrate and richen in the unfrozen liquid, Au(Ⅲ) is stable, but Au(0) is unstable and easy to precipitate under the temperature higher than or equal to the melting point...

The regeneration mechanisms of gold placers in permafrost is an international pioneering issue For the first time, this paper presents the dynamic characteristics of Au(Ⅲ), Au(0) contents and salinity in different valence gold-bearing NaCl solutions under uniaxial freezing During the freezing, salting out makes gold and saline ions greatly migrate and richen in the unfrozen liquid, Au(Ⅲ) is stable, but Au(0) is unstable and easy to precipitate under the temperature higher than or equal to the melting point The simulation experiment shows that the key to the regeneration of gold placers in permafrost maybe is to change the gold valence, which is affected by cold region environment, and then to accelerate the precipitation of gold in unfrozen liquid In addition, cold environment can enrich the minute and fine gold grains in sediments and is favourable to their growth Consequently, enrichment area of gold forms in permafrost Frost probably plays an important role in the regeneration process of gold placers in permafrost

文章首次报道了含不同价态金的NaCl溶液在单向冻结条件下,其中的Au(Ⅲ)、Au(0)浓度及盐度的变化特征。实验结果表明,冻结过程中,由于“盐析作用”的结果,金元素及盐分离子发生强烈迁移,大量富集在未冻液中。在常温及零温条件下,Au(Ⅲ)稳定,Au(0)最不稳定,极易发生沉淀。表明冻土带砂金矿再生的关键可能就在于如何使金的价态发生变化,从而导致未冻液中金元素的沉淀,以及使分散在沉积物中的微细粒金进一步富集、长大。

The history and the present situation of the international and domestic studies on ice cores are reviewed in this paper The summary of the Laboratory of Ice Core and Cold Regions Environment is given in two aspects: 1) hardware, such as establishing of the laboratory and equipment; 2) software, such as stuff in the laboratory At present, there are three research field: 1) The interaction processes between glacier and atmosphere; 2) The ice core records; 3) The physics of snow and ice Thirty-two projects...

The history and the present situation of the international and domestic studies on ice cores are reviewed in this paper The summary of the Laboratory of Ice Core and Cold Regions Environment is given in two aspects: 1) hardware, such as establishing of the laboratory and equipment; 2) software, such as stuff in the laboratory At present, there are three research field: 1) The interaction processes between glacier and atmosphere; 2) The ice core records; 3) The physics of snow and ice Thirty-two projects have been finished or are being carried out More than 300 papers and 9 monographs have been published There are 4 achievements in scientific research were awarded Cooperation have been hold between some high level scientific departments and the laboratory In the future, the research goal of the laboratory will be focused on the climatic and environmental records and modern processes in cold regions It is urgent to cultivate and recruit more qualified researchers

对国际和国内冰芯研究的历史与现状,以及冰芯与寒区环境开放研究实验室的硬件(基础建设和仪器设备)和软件(科研力量)方面进行了简介目前冰芯与寒区环境开研究实验室的三大研究领域为:1)冰川与大气相互作用过程研究;2)冰芯记录研究;3)雪冰物理学研究实验室已完成和正在承担的课题有32项,发表论文300多篇,专著9部,有4项成果获奖,并同国际多家高水平的研究机构保持合作关系实验室今后发展目标是,在寒区气候环境记录和寒区现代过程两个方面取得突破,同时还将进一步培养和吸收人才

 
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