天然精品绿松石

绿松石,工艺名称为"松石",因其形似松球且色近松绿而得名,是世界上稀有的贵宝石品种之一。绿松石有着几千年的悠久历史,被视为神秘、高贵、避邪之物,深受中外人士的喜爱。绿松石是铜和铝的磷酸盐矿物集合体,因所含元素不同而颜色略有差异,多呈天蓝色、淡蓝色、绿蓝色、绿色、带绿的苍白色。色彩是影响绿松石质量的重要因素,含铜的氧化物时呈蓝色,含铁的氧化物时呈绿     

某厂电镀车间场地土壤与地下水污染特征

选择某厂电镀车间作为研究区域,采集土壤、地下水、底泥和地表水样品,对样品的pH 值、铬、锌、砷、镉、铜、镍、铅和氰
化物含量进行了测试,分析了污染物在该区域内的分布特征。结果表明,研究区域土壤主要受到铬、锌、氰化物污染,43%采样点
土壤中锌浓度超出土壤环境质量标准三级标准,29%采样点土壤中总铬浓度超出三级标准。55%的采样点地下水受到锌和六价
铬污染。电镀车间污水排放口处土壤和地下水样品中均检测到一定浓度的氰化物。电镀车间架空区域下池塘1底泥和附近池塘
3底泥及地表水已经受到铬和锌污染。区域内污水池和污泥池铬、锌浓度则严重超标。元素污染物锌、铬和氰化物分别来源于电
镀液、电镀后铬酸盐钝化处理及前期采用的氰化物电镀工艺。在分析目前重金属元素污染场地修复技术基础上,建议研究区域采
用植物修复技术进行治理。      

环境植物样品中铜铅锌铁锰的测定

将环境植物样品在４００─５００℃灰化，用硝酸、氢氟酸和高氯酸分解，用盐酸（１＋１）提取，控制２％─３％的盐酸介质，用火焰原子吸收分光光度法测定环境植物样品中的微量铜、铅、锌、铁、锰。该方法简单、快速、可靠。对环境植物标准样品的测定结果理想。     

莱州市新立金矿床地球化学特征浅析

对新立金矿床31号勘探线的岩石地球化学样品进行了金、银、铜、铅、锌、砷、锑、铋、汞、镍、钴、锡等12种元素的分析测试和参数统计计算。通过相关分析,金、银、铜、铅、锌、锑、铋、钴、镍呈正相关,与汞、锡呈负相关。据某些特征元素预测,该矿床深部找矿远景不大。     

莱州市新立金矿床地球化学特征浅析

对新立金矿床31号勘探线的岩石地球化学样品进行了金、银、铜、铅、锌、砷、锑、铋、汞、镍、钴、锡等12种元素的分析测试和参数统计计算。通过相关分析,金、银、铜、铅、锌、锑、铋、钴、镍呈正相关,与汞、锡呈负相关。据某些特征元素预测,该矿床深部找矿远景不大。     

新疆梧南金矿元素组合特征及地质意义

以新疆梧南金矿区地质背景和矿床原生晕研究为基础，以4号勘探线为代表区段，采集4个钻孔的193件地球化学样品进行金、银、砷、锑、汞、铜、铅、锌、铋、钼10项元素的测试分析和资料整理、统计制图等，对元素组合及相关关系进行统计分析。结果表明：金与尾部元素呈正相关，与前缘元素呈负相关。首次建立了该矿床的原生晕分带，从前缘到尾部为：金－铋－铜－钼－汞－锑－银－砷－铅－锌，从而确定了该矿床的地球化学原生晕叠加模型：上部矿体的尾晕与下部矿体的前缘晕叠加到一起，形成尖灭再现或尖灭侧现的原生晕叠加形态。     

悬浮液进样技术测定蕨麻中的微量铜和锌

悬浮液进样—火焰原子吸收光谱法能快速、准确地测定样品中的微量元素,应用于测定蕨麻中的微量铜和锌,对试验条件、悬浮剂的选择进行了优化。试验测定铜、锌的精密度(RSD)分别为1.84%、1.46%,检出限分别为0.01μg/mL、0.027μg/mL。测定结果与消化法一致,相对误差分别为0.5%、0.9%,F检验表明两种样品处理方法无显著性差异。     

莱州市新立金矿床地球化学特征浅析

对新立金矿床31号勘探线的岩石地球化学样品进行了金、银、铜、铅、锌、砷、锑、铋、汞、镍、钴、锡等12种元素的分析测试和参数统计计算.通过相关分析,金、银、铜、铅、锌、锑、铋、钴、镍呈正相关,与汞、锡呈负相关.据某些特征元素预测,该矿床深部找矿远景不大.     

中心对称矿物中CU2+六配位的晶场势能和微扰矩阵元计算

对于离子型或以离子键为主的晶体，其光学和磁学性质可用晶体场理论解释。通过晶场微扰矩阵元的计算，可定量地确定晶场光谱谱带位置。以往资料无矩阵元的计算过程，只是给出了部分积分结果，这不利于在任何对称情况下晶场微扰矩阵元的计算。推导了中心对称矿物的晶场势能算符，计算了积分值，得出了矩阵元以系数Aλx,r^2和r^4的表达式。并以绿松石的结构数据为基础，计算了Cu^2＋的晶场微扰矩阵元表达式中的系数Aλx,从而计算了各矩阵元，通过对称矩阵的对角化，最终求得绿松石中Cu^2＋d轨道能量和晶体场谱带位置计算值。与实验资料对比，符合较好。因此，用晶体场理论和实验资料相结合可定量地阐明具离子键晶体的呈色机制。     

绿松石呈色的晶体场理论计算

绿松石中Cu^2 电子组态为3d^9,为中心对称配位八面体，配位体为4个OH^-和2个H2O，在晶体场作用下，五重简并的d轨道分裂为5个能量不同的轨道，dx^2-y^2为基态，其余为激发态，依跃迁选律．从基态到四个激发态的跃迁为自旋允许跃迁，从而形成了铜离子吸收光谱的4条谱带。前人对绿松石中Cu^2 晶体场势能计算时，个别系数有误，笔者进行了修改，并补充了部分角度函数的积分值，从而使结果得到了改进，计算谱带位置与实测可见光吸收光谱谱带位置十分接近。在进行晶体场势能计算时，角度函数积分值是非常重要的，以往的资料只是直接给出了部分积分值，这在计算低对称配位八面体晶体场势能时是不够的，这次重新计算了所有可能的角度函数积分值，对各种对称下配位八面体晶体场能量的计算提供了可能。     

Preliminary study on plasma membrane fluidity of Psychrophilic Yeast Rhodotorula sp.NJ298 in low temperature

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.     

Information for authors

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     

JOURNAL OF OCEAN UNIVERSITY OF CHINA

<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     

Information for Authors

<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-     

Hydraulics and Hydrology in Mountain Areas

<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     

Sea ice thickness measurement in spring season in Bothnian Bay using an electromagnetic induction instrument

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.     

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf

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.     

Phylogenetic analysis of cultivable bacteria isolated from Arctic sea-ice

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.     

Foreword

正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a