冲击压实技术在上海浦东机场跑道浅层地基处理中的试验应用

总结了上海浦东机场二期飞行区3种不同组合的冲击碾压试验——冲击碾压联合高真空排水、冲击碾压联合塑料排水板、冲击碾压，试验结果表明，冲击碾压联合高真守排水方法压实效果最为显著，并在二期飞行区浅层地基处理实践中得到应用。     

几丁质和脱乙酰几丁质的吸附特性及其用于水中痕量铜的测定

THEUTILIZATIONOFCHITINANDCHITOSANINDETERMINGTHECONTENTOFTRACECUPRICION测定铜含量的方法有多种,如二乙氨基二硫代甲酸钠,原子吸收分光光度法等。几丁质（缩写为CT）广泛地存在于动植物中,它是一种天然的大分子含氮多糖化合物,是β-1,4连接的乙酰氨基葡聚糖,它具有吸附离子的能力,能富集金属离子,故对水的净化具有应用潜力[1]。近年来国人对CT的研究日渐增多,在食品、医药、环保、农业、造纸、印染、日用化工以及酶制剂等方面,已陆续见诸报道。自然界甲壳质产量达100×108t,但实际用量仅2000t…     

The source and distribution of polychlorinated dibenzo-p-dioxin and polychlorinated dibenzofurans in sediments of Port Jackson, Australia

Concentrations of polychlorinated dibenzo-p-dioxins (dioxins)(PCDDs) and polychlorinated dibenzofurans (PCDFs)(furans) in sediments from Port Jackson ranged from 32 to 4352 pg WHO-TEQ DF g(-1)dw with a mean of 712 pg g(-1)dw. Maximum total dioxins plus furans concentrations in this sediment was 6,290,000 pg g(-1)dw, which is the highest recorded in Australia and among the highest reported for sediment globally. Permanent bans were placed on fin fishing and prawn trawling in February, 2006 for the whole estuary, based on dioxin tissue burdens. A distinct congener profile corresponded to chemicals known to have been produced by industry on the shores of Homebush Bay in the upper estuary. These chemicals are being dispersed extensively and exceed pre-anthropogenic concentrations in even distant, less developed parts of the harbour. Remediation of sediments is currently being undertaken, with the intention of containing dispersion of dioxins and reducing body burdens in fin fish and prawn populations.     

维特瓦特斯兰德金—铀砾岩矿床成因争论新进展

在对世界著名的维特瓦特斯兰德矿床成因讨论中，存在着2种主要观点：热液交代说和砂积成因说。后者经过补充、修改演变为改造砂矿成因说。最近，加拿大地质学家Reimer和Mossman代表后一种观点撰文，概括了近年来争论的焦点，回答了热液成因论者的质疑。     

A modular injection system, multilevel sampler, and manifold for tracer tests

Ground water injection and sampling systems were developed for bacterial transport experiments in both homogenous and heterogeneous unconsolidated, surficial aquifers. Two types of injection systems, a large single tank and a dynamic mixing tank, were designed to deliver more than 800 L of amended ground water to the aquifer over 12 hours, without altering the ground water temperature, pH, Eh, or dissolved gas composition. Two types of multilevel samplers (MLSs) were designed and installed. Permanent MLSs performed well for the homogenous surficial aquifer, but their installation procedure promoted vertical mixing, which could obfuscate experimental data obtained from vertically stratified, heterogeneous aquifers. A novel, removable MLS was designed to fit in 2- and 4-inch wells. Expandable O-rings between each sampling port hydraulically isolated each port for sample collection when a nut was tightened at the land surface. A low-cost vacuum manifold system designed to work with both MLS designs used 50 mL centrifuge tubes to efficiently sample 12 MLS ports with one peristaltic pump head. The integrated system was developed and used during four field campaigns over a period of three years. During each campaign, more than 3000 ground water samples were collected in less than one week. This system should prove particularly useful for ground water tracer, injection, and push-pull experiments that require high-frequency and/or high-density sampling.     

地下水中砷元素的形成及其控制因素

研究了长江中下游地区和吉林省地区地下水中砷元素形成和主要控制因素及其分布规律。结果表明,地下水中砷主要以H_3ASO_3、H_2AsO_4~-、HA_3O_4~(2-)等形式存在。它的形成和分布与含水介质及其上覆土层的砷含量、地下水的酸碱度、地下水的迳流条件、氧化还原环境、有机物质及铁锰等有密切的关系。     

钻探用金刚石强度的初步研究

随着近代钻探技术的发展,金刚石作为一种主要钻探磨料,已越来越广泛地应用于地质、冶金、煤炭、石油等钻探工程。     

青海省土地承载力的系统动力学研究

以资源——资源生态——资源经济科学的理论为基础,对青海省土地资源人口承载力系统条件的综合分析,针对各类资源之间的平衡关系、农业结构与资源结构的匹配关系、单产潜力的预测与总生产潜力的仿真,进行人口与资源关系的综合研究,建立该地区土地资源人口承载力的动态模型。