Study of fate and transport of chromium in unsaturated zone- saturated zone

<正>Effluent irrigation can ease the water shortage area agricultural water shortage,and waste-water recycling,as well as bring a series of scientific and socio-economic issues,such as environmentalissues,food safety,sustainable development and so on,which has attracted the attention of people.So,paper to Kaifeng city several important dirt irrigation district for     

广东官田含铜碲黄铁矿矿床中的硫盐矿物及矿床成因

对广东官田黄铁矿矿床研究过程中，在该区首次发现多种硫盐矿物，文章对硫盐矿物进行了系统阐述，对矿石组构、主、微量元素特征，矿化期，次进行了研究。通过硫、氢氧同位素、流体包裹体成分等几方面的研究，进而探讨矿床成因，研究认为，矿床的形成以火山－岩浆期后气液为主，并有大气降水混合中－低温热液交代脉状矿床。     

应用瑞雷波等方法对公路质量进行无损检测

针对水泥混凝土公路质量检测的内容和目前常规检验方法的不足,本文叙述了采用瑞雷波法、超声波法和音频共振法的结合,测试路基路面强度和路面厚度的基本原理,并对几个工程测试实例进行了分析。     

碲砷黝铜矿在我国的首次发现及其找矿意义

碲砷黝铜矿产于广东陆丰中低温热液蚀变岩型硫矿床中，该矿物呈浑圆状、不规则状嵌布在黄铁矿内，粒径０．０２－０．２０ｍｍ，铅灰色，硬度Ｈｖ＝２６９．３ｋｇ／ｍｍ＾２，反射色呈灰色微带棕色色调，均质性。     

论潜蚀和块体运动在河流袭夺中的主导作用─—河流袭夺作用机制与实例剖析

区域地壳隆升或地槽回返褶皱成山后,斜坡上出现平行状水系.随着河流的溯源侵蚀,分水岭后退,水系适应内外力条件演变成不同型式,并发生河流袭夺.导致河流发生袭夺的决定性原因,一是袭夺河的快速溯源侵蚀,二是位于分水岭反面的高位被袭夺河的河床下与古分水岭下潜蚀作用和块体运动.湔江支流之一海子河在早更新世末依次袭夺了古花园沟河(已消失)和古银厂沟河(原石亭江右支流)等河.     

高分辨率遥感影像城中村提取的景观语义指数方法

城中村是中国一类特殊的非正式居民区。本文从城中村的物理特点出发,采用景观语义指数描述复杂的城中村场景,提出基于景观语义指数的高分辨率遥感影像城中村提取方法,并采用“分类置信度-反馈”机制进行实际可操作的大范围城中村制图。以广州市核心城区为例,城中村检测的总体精度达到了90%以上。试验结果表明相对于传统的光谱、纹理特征,景观语义指数能够更好地描述城中村的根本形态特点,更准确的城中村提取。此外,“分类置信度-反馈”机制能够充分参考机器学习的分类概率,以有限的人工干预生产更加准确的城中村制图产品。因此,本文方法能够有效应用于大范围的城中村提取与制图。     

Origin of the Gas Hydrate and Free Gas in the Qilian Permafrost,Northwest China: Evidence from Molecular Composition and Carbon Isotopes

The Qilian permafrost of the South Qilian Basin (SQB) has become a research focus since gas hydrates were discovered in 2009.Although many works from different perspectives have been conducted in this area,the origin of gas from gas hydrate is still controversial.Molecular composition and carbon isotope of 190 samples related to gas hydrates collected from 11 boreholes allowed exploration of genetic type,thermal maturity, biodegradation,as well as gas-source correlation of alkane gases from gas hydrates and free gases.Results indicate that alkane gases biodegraded after the formation of natural gas.According to differences in carbon isotopes of methane and their congeners (CH4,C2H6,C3H8),the thermal maturity (vitrinite reflectance,VRo) of most alkane gases ranges from 0.6% to 1.5%,indicating a mature to high mature stage.The thermal maturity VRo of a small part of alkane gas (in boreholes DK5 and DK6) is higher than 1.3%,indicating a high mature stage.Alkane gases were mainly produced by secondary cracking,consisting of crude oil-cracking gases and wet gases cracking to dry gases.Genetic types of alkane gases are primarily oil-type gases generated from shales and mudstones in the upper Yaojie Formation of Jurassic,with less coal-type gases originated from the mudstones in the Triassic Galedesi Formation and the lower Yaojie Formation of Jurassic.Carbon dioxides associated with alkanes from gas hydrates and free gases indicate the thermal decomposition and biodegradation of organic matter.The origins of natural gases from gas hydrates and free gases shed light on the evaluation of petroleum resource potential,deeply buried sediments,and petroleum resource exploration in the SQB.     

浙江南部沿岸附着生物与钻孔生物——Ⅲ.南几岛的附着生物与钻孔生物生态

附着生物与钻孔生物的分布是随着外界环境因素的不同而异,一般都受到了温、盐、流等外界因素的影响.因此,合理布局试验点,是全面了解我国沿岸附着生物生态,系统地掌握生物学资料的关键.十几年来,为了满足国防和国民经济建设上的需要,我所及其他单位已对中国沿岸的附着生物和钻孔生物做了大量的试验和调查研究,仅东海沿岸,从长江口、舟山海区、石浦到福建沿岸就做了近20处的试验.     

春末黄东海域溶解氧垂直结构及氧最大值初步分析

根据1987年5～6月中日合作对黄东海域进行综合调查的溶解氧资料,讨论了该海区溶解氧垂直结构及氧最大值分布。指出在南黄海北部、中部及东海北部和中部的中层存在明显的溶解氧垂直分布最大值,它总是和冷水同存。并对氧最大值及垂直结构同温跃层及冷暖水之间关系进行了初步分析。     

春末黄东海域溶解氧分布与水团关系

以１９８７年５—６月中日台作黄东海域综合调查的溶解氧资料为主，探讨调查海区溶解氧分布特征与水团的对应关系。指出：近岸水团溶解氧合量高，远海低；上层水团高，下层低。在黄海冷水和东海北部底层冷水的上界出现明显的溶解氧垂直分布最大值及封闭形高氧区。水团边界区，氧跃层明显。溶解氧含量变化与水团温盐特性有关。通过分析发现，溶解氧对鉴别次表层以深各水团，特别对鉴别东海次表层水及黑潮次表层以深各水团，可作为一种有效的指标。