共查询到20条相似文献，搜索用时 92 毫秒
1.
李孝芳 《中国地理科学(英文版)》1994,(2)
ＣＯＭＰＬＥＸ ＥＣＯＬＯＧＩＣ－ＥＣＯＮＯＭＩＣ ＳＹＳＴＥＭ ＯＦ ＡＦＦＯＲＥＳＴＡＴＩＯＮ－ＡＮ ＥＸＡＭＰＬＥ ＯＦ ＳＵＳＴＡＩＮＡＢＬＥ ＡＧＲＩＣＵＬＴＵＲＥ ＬｉＸｉａｏｆａｎｇ（李孝芳）（ＣｏｍｍｉｓｓｉｏｎｆｏｒＩｎｔｅｇｒａｔ... 相似文献
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通过采集江汉平原沙湖原种场典型高砷地下水区的２７个地下水样品、６个地表水样品和不同深度的沉积物样品，采用 Ｘ射线荧光光谱、离子色谱、ＴＯＣ分析仪以及沉积物平行提取方法对该区含水层的水化学特征以及沉积物的地球化学特征进行了分析。结果表明:该区地下水水化学类型主要为 ＨＣＯ３－Ｃａ·Ｍｇ型，属中性偏弱碱性水；氧化还原电位较负，ＮＨ＋４ －Ｎ、ＨＳ－ 和 Ｆｅ（Ⅱ）质量浓度较高，指示地下水的强还原环境；地 下 水 Ａｓ质 量 浓 度平均值为７４．３９μｇ／Ｌ，最大值达５８０．７７μｇ／Ｌ，出现在地面以下２５ｍ 位置，且 Ａｓ（Ⅲ）质量浓度普遍高于 Ａｓ（Ｖ）。随深度增加，沉积物中 ｗ（Ａｓ）呈先增加后减小的趋势，在１７．４ｍ（黏 土层）深度处达到最大（２１．１５ｍｇ／ｋｇ），且ｗ（Ａｓ）随深度的变化与沉积物中 ＴＯＣ、Ｆｅ２Ｏ３、Ａｌ２Ｏ３ 质量分数以及沉积物比表面积随深度的变化呈现相同的趋势，采用ＳＰＳＳ软件经相关分析亦表明 Ａｓ与 ＴＯＣ、Ｆｅ２Ｏ３、Ａｌ２Ｏ３ 和比表面积具有较强的相关关系，相关系数分别为０．７０，０．６８，０．７０，０．６７，揭示砷在富含有机质、铁铝氧化物及比表面积大的黏土层沉积物中更易富集。沉积物平行提取实验结果表明，江汉平原沉积物中的砷主要以强结晶态铁氧化物、溶解态硫化物和反应性硅酸盐的形式存在。 相似文献
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阜新北部“瓦子峪组”中发现海绵骨针化石ＡＤＩＳＣＯＶＥＲＯＦＳＰＯＮＧＥ－ＳＰＩＣＵＬＥＩＮＷＡＺＩＹＵＦＯＲＭＡＴＩＯＮＯＦＪＩＡＮＰＩＮＧＧＲＯＵＰ，ＡＲＣＨＥＡＮ，ＩＮＴＨＥＮＯＲＴＨＦＵＸＩＮ阜新北部地处华北地台北缘东西向构造带与锦州－哈尔套... 相似文献
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滑坡地下水环境的变化对滑带土的强度和变形参数有着极大的影响，并影响滑坡的稳定性。三峡库区受到库水位升降及降雨入渗的影响，使得发育于该地区滑坡的滑带土含水率及离子浓度一直处于不断的变化中。以重庆万州区兴福寺滑坡为例，针对滑带土重塑样，采用 Ｘ 射线衍射分析了其矿物成分，然后进行了不同含水率下固结排水直剪试验、不同ＳＯ２－４ 离子浓度下滑带土的固结排水慢剪试验以及不同 ＳＯ２－４ 离子浓度下滑带土直剪反复剪切试验。试验结果表明:滑带土成分以黏土矿物、石 英、钠 长 石 等 为 主，其中黏土矿物以伊蒙混层、伊 利 石为主；含水率对滑带土抗剪强度指标的影响较为明显，具体为黏聚力随含水率的增大而增大，内摩擦角随含水率的增大而减小；ＳＯ２－４ 离子浓度对滑带土抗剪强度指标的影响也较为显著，随 着 ＳＯ２－４ 离子浓度的增大，黏聚力 与内摩擦角均减小；滑带土经过反复剪切后，残余强度、黏聚力和内摩擦角均随着ＳＯ２－４ 离子浓度的增大而减小。 相似文献
5.
阎小培 《中国地理科学(英文版)》1996,(1)
ＳＯＭＥＡＳＰＥＣＴＳＯＦＥＸＰＯＲＴＬＡＢＯＵＲＳＥＲＶＩＣＥＩＮＣＨＩＮＡ阎小培ＳＯＭＥＡＳＰＥＣＴＳＯＦＥＸＰＯＲＴＬＡＢＯＵＲＳＥＲＶＩＣＥＩＮＣＨＩＮＡ￥ＹａｎＸｉａｏｐｅｉ（ＣｅｎｔｒｅｆｏｒＵｒｂａｎ＆ＲｅｇｉｏｎａｌＳｔｕｄｉｅｓ，Ｚ... 相似文献
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ＳＴＡＴＩＳＴＩＣＡＬＡＮＡＬＹＳＩＳＯＦＴＥＭＰＥＲＡＴＵＲＥＳＯＮＢＯＴＨＴＨＥＵＰＰＥＲＡＮＤＬＯＷＥＲＢＯＵＮＤＡＲＩＥＳＯＦＳＵＢ－ＡＬＰＩＮＥＤＡＲＫＣＯＮＩＦＥＲＦＯＲＥＳＴＳＩＮＣＨＩＮＡＷａｎｇＪｉａｎ（王建）；ＸｕＸｉａｏｂｉｎ（... 相似文献
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本矿床是我国金红石矿床重要的成因及工业类型，为具有特定化学成分的岩石在特定变质条件下形成的。本文通过对大量数据的处理，查明了化学成分与成矿的关系：高Ａｌ２Ｏ３、ＭｇＯ、Ｆｅ２Ｏ３＋ＦｅＯ、Ｋ２Ｏ、Ｐ２Ｏ５、Ｈ２Ｏ＋、ＭｎＯ，低ＳｉＯ２、ＣａＯ、Ｎａ２Ｏ、ＣＯ２、Ｓ等，利于钛富集；高ＴｉＯ２、ＭｇＯ、Ｐ２Ｏ５、Ｓ，低ＳｉＯ２、ＣａＯ、Ｋ２Ｏ、Ａｌ２Ｏ３、Ｆｅ２Ｏ３／ＦｅＯ，利于金红石形成；高Ｓｃ、Ｚｒ、Ｎｉ、Ｚｎ及Ｌａ／Ｙｂ，低Ｙ、Ｎｂ、Ｔｈ、Ｃｄ、Ｂａ、Ｂｅ、ΣＲＥＥ，利于金红石纯度提高。对研究矿床成因及寻找新的同类矿床等有重要意义 相似文献
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利用等温溶解法测定了三元体系Ｌｉ２Ｃ２Ｏ４－Ｌｉ２ＣＯ３－Ｈ２Ｏ（２５℃）的溶解度，相平衡图中有三个相区，即ＬｉｈＣＧＯ４、Ｌｉ２ＣＯ３、Ｌｉ２Ｃ２Ｏ４＋Ｌｉ２ＣＯ３。两条单变量曲线，一个共饱点。 相似文献
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本文研究了Ｄ_００１大孔阳离子强酸树脂从Ｈ_２ＳＯ_４－ＣＳ（ＮＨ_２）_２溶液中，富集及分离Ａｕ（Ｉ）、Ａｇ（Ｉ）的性能。表明在ｐＨ＝２．０左右，树脂对Ａｕ（Ｔｕ）￣＋_２、Ａｇ（Ｔｕ）￣＋_２（Ｔｕ＝硫脲）有良好的吸附性能，Ａｕ和Ａｇ的吸附容量分别为６１．１８ｍｇ／ｇ－Ｒｅｓｉｎ和９９．１１ｍｇ／ｇ—Ｒｅｓｉｎ。负载柱上的Ａｕ、Ａｇ可分别用ＮａＣＮ—ＮａＯＨ和Ｈ_３ＢＯ_３－ＮａＯＨ－Ｎａ_２Ｓ_２Ｏ_３定量洗脱。可进行一定程度的Ａｕ、Ａｇ分离。 相似文献
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The ability of cell to modulate the fluidity of plasma membrane was crucial to the survival of microorganism at low temperature. Plasma membrane proteins, fatty acids and carotenoids profiles of Antarctic psychrophilc yeast Rhodotorula sp. NJ298 were investigated at -3 ℃, 0 ℃ and 8 ℃. The results showed that plasma membrane protein content was greater at -3 ℃ than that at 8 ℃, and a unique membrane polypeptide composition with an apparent molecular mass of 94.7 kDa was newly synthesized with SDS-PAGE analysis; GC analysis showed that the main changes of fatty acids were the percentage of unsaturated fatty acids (C18∶ 1 and C18∶ 2) and shorter chain saturated fatty acid (C10∶ 0) increased along with the decrease of the culture temperature from 8 ℃ to -3 ℃; HPLC analysis indicated that astaxanthin was the major functional carotenoids of the plasma membrane, percentage of which increased from 54.6±1.5% at 8 ℃ to 81.9±2.1% at -3 ℃. However the fluidity of plasma membrane which was determined by measuring fluorescence anisotropy was similar at -3 ℃, 0 ℃ and 8 ℃. Hence these changes in plasma membrane's characteristics were involved in the cellular cold-adaptation by which NJ298 could maintain normal plasma membrane fluidity at near-freezing temperature. 相似文献
13.
《极地研究(英文版)》2014,(4)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprehensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose 相似文献
14.
《中国海洋大学学报(英文版)》2014,(4)
<正>Copyright Submfnion of a roanusatpt inks:that the work described has not been published before(exoept In the form of an abstrW or as part of a published lecture,review,or thesis);that it is not under consideration for publication elsewhere that its publication has been approved by ail 相似文献
15.
《中国海洋大学学报(英文版)》2014,(6)
<正>The Journal of Ocean University of China(Oceanic and Coastal Sea Research)is a comprehensive academic quarterly sponsored by the Ocean University of China,published one volume per year.This journal is devoted to the publication of the theoretical and applied research results on oceanography and marine fisheries.The fieldcovered include the physical,chemical,biological,geo- 相似文献
16.
Massimo GRECO 《山地科学学报》2014,(6):1383-1384
<正>The 35th IAHR World Congress was held in Chengdu,China from September 8 to September 132013.The title of the conference was:"The Wise Finds Pleasure in Water:Meandering through Water Science and Engineering".During the congress,1239 papers were presented in 139sessions for oral presentations and 7 sessions for poster presentations.After the Congress,a Committee was appointed to select some of the best papers presented at the Congress for publication,after a 相似文献
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As an important component of the cryosphere,sea ice is very sensitive to the climate change.The study of the sea ice physics needs accurate sea ice thickness.This paper presents an electromagnetic-induction(EM) technique which can be used to measure the sea ice thickness distribution efficiently,and the successful application in Bothnian Bay.Based on the electromagnetic field theory and the electrical properties of sea ice and seawater,EM technique can detect the distance between the instrument and the ice/water interface accurately,than the sea ice thickness is obtained.Contrastive analysis of the apparent conductivity data obtained by EM and the value of drill-hole at same positions allows a construction of a transformable formula of the apparent conductivity to sea ice thickness.The verification of the sea ice thickness calculated by this formula indicates that EM technique is able to get reliable sea ice thickness with average relative error of only 12%.The statistic of all ice thickness profiles shows that the level ice distribution in Bothnian Bay was 0.4-0.6 m. 相似文献
18.
Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献