泥炭土地基钻孔漏浆的处理

以云南鸡石一级公路青鱼湾大桥为例，介绍了在软弱地层中施工桥梁钻孔灌注桩遇孔壁开裂漏浆时的处理方法，经试验证明，取得了较好的技术经济效果。     

阳泉市常用地基处理方法探讨

对阳泉市常用地基处理方法进行了分析，从适用范围、设计要点、施工与检验等方面进行了论述，着重提出了阳泉市常用地基处理方法的特点与适用性。     

水管理策略对土壤水盐动态和区域地下排水影响的模拟评价

以宁夏惠农灌区平罗试验区为对象，基于田间观测与灌溉试验结果，在田间尺度采用SWAP模型开展不同地下水调控深度与灌溉制度相结合的水管理方案下土壤水盐动态的模拟，在区域尺度采用MODFLOW模型进行不同水管理方案对区域地下排水量影响的模拟评价，据此分析土壤水盐动态过程和农田排水系统的作用，对拟定的各种水管理方案进行评价。结果表明，现状灌溉用水量虽有助于减少表土盐分积聚，但地下排水量占灌溉用水量的39．4％；现状灌溉用水量减少50％时，浅埋地下水位会加重表土积盐；现状灌溉用水量减少25％时，作物根区没有产生明显的积盐，地下排水量减少31．4％。因此，较为合理的水管理方案是将现状灌水量减少25％的同时将地下水埋深控制在70cm以下，才能达到节水、增产、改善农田水土环境的目标。     

Geotechnical properties of the soft soil in Guangzhou College City

The paper describes some geotechnical properties of the soft soils in Guangzhou College City, China, which are difficult to both sample and test. Laboratory and in situ tests were carried out to assess the physical and mechanical indices of the soils. The data were statistically analyzed and linear regression undertaken such that equations could be developed by which the geotechnical properties of the soft soils can be predicted. The statistical validity of the degree of correlation confirmed that using these equations, the mechanical indices can be estimated from physical indices determined by routine testing.      

Electrokinetic remediation of soils contaminated with heavy metals

This paper describes the results obtained from an electrokinetic treatment of a real soil polluted by lead acetate. Powdered soil samples were pressed with a consolidometer till 100 kPa to obtain cylindrical specimens with the same characteristics as a subsoil. Tests were carried out in a Perspex electrochemical cell where soil specimens were introduced with a hollow punch. A low intensity direct current was applied in order to remove contaminants, due to electrophoresis and electroosmosis phenomena. The water flow, conductivity, apparent electroosmotic coefficient, as well as other characteristic parameters, were measured throughout the test. The water content and degree of pore saturation were estimated at the beginning and end of the test. The soil slab was divided into four slices and the Pb concentration profile determined. The main factor governing the extraction of contaminant was found to be the pH in the acidic range. Indeed, under these conditions high removal efficiencies could be reached. These results could lead to the design of a new electrochemical treatment cell equipped with a cationic membrane to expand the region of favourable pH within the soil.     

Oxidative radical generation via nitrogen dioxide dimer conversions induced by amide groups of macromolecules

The features of initiation of free radical reactions in polymers by dimers of nitrogen dioxide are considered. The conversion of planar dimers into nitrosyl nitrate in the presence of amide groups of macromolecules has been revealed. Nitrosyl nitrate initiates radical reactions in oxidative primary process of electron transfer with formation of intermediate radical cations and nitric oxide. As a result of subsequent reactions, nitrogen‐containing radicals are produced. The dimer conversion has been exhibited by estimation of the oxyaminoxyl radical yield in characteristic reaction of p‐benzoquinone with nitrogen dioxide on addition of aromatic polyamide and polyvinylpyrrolidone to reacting system. The isomerization of planar dimers is efficient in their complexes with amide groups, as confirmed by ab initio calculations. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2008     

电子工业用高纯氮的生产

生产电子工业用高纯氮的制氮装置 ,其要点和难点是一氧化碳和氢的清除。采用一氧化碳转换炉和特殊的冷箱内流程组织 ,可以生产纯度为 99 9999%以上的高纯氮。对制取电子工业用高纯氮制氮装置与常规制氮装置加氮终端净化器两种流程进行了比较。     

宜兴抽水蓄能电站环保及水土保持工程的综合利用

介绍了宜兴抽水蓄能电站建设过程中对环保及水土保持工程综合利用的做法.项目利用实施4#拦渣坝环保及水土保持工程,根据所处区域的地形、地貌,通过对4#拦渣坝的设计优化,不但使其具有拦挡冲沟的泥沙进入下水库的功能,又利用改进坝型形成一定供水能力的小水库解决了可以提供符合标准的生活用水的难题,从而提升了4#拦渣坝的复合功能,实现了该电站环保及水土保持工程的综合利用.     

Thermokinetics of Liquid-Liquid Reaction of Dy（NO3 ）3 with Histidine

The thermokinetics of liquid-liquid reaction of dysprosium nitrate with histidine were studied using a microcalorimeter. On the basis of experimental and calculated results, threethermodynamic parameters (the activation enthalpy, the activation entropy and the activation free enegy),the rate constant, three kinetic parameters (the activation energy, the pre-exponential constant and the reaction order) wereobtained. On the basis of thermodynamics and kinetics, the for marion reaction of the complex was discussed.     

Effect of functionalization and boron and nitrogen substitution on some properties of carbon nanotubes

Molecular orbital calculations of the ionization potential of single wall carbon nanotubes having donor NH₂ and acceptor NO₂ groups bonded to the side walls and ends and boron and nitrogen substituted for carbon show substantial increases in ionization potential compared to carbon nanotubes with no functional groups and no carbon substitutions. The presence of a carbon vacancy on the side wall also causes a substantial increase in the ionization potential. The effect of tube length on the ionization energy is also calculated. The calculations also suggest that at appropriate levels of boron and nitrogen doping the armchair carbon nanotubes could be high temperature organic ferromagnetic materials.