褪色光度法测定氰化物

根据ＣＮ－ 对５－（４－磺酸基苯偶氮）－８－氨基喹啉（ＳＰＡＱ）－Ｎｉ２＋ －ＣＴＭＡＢ体系的干扰褪色作用，建立了一种测定氰化物的新方法。该方法比传统方法操作简便，不需要萃取。体系λｍ ａｘ＝ ６００ｎｍ ，ε＝ ６．８８×１０４ Ｌ·ｍ ｏｌ－ １·ｃｍ － １。ＣＮ－ 含量在０～５ μｇ／２５ｍ Ｌ内符合比尔定律。方法用于环境水样中氰化物的测定。     

火焰原子吸收光谱法测定废水中铊

研究了火焰原子吸收光谱法测定废水中铊，方法的检出限（3σ）为0．15mg.L^-1，回收率为90％－105％，相对标准偏差小于2％，方法简便快速。     

Incompressible SPH simulation of water entry of a free‐falling object

In this paper an incompressible smoothed particle hydrodynamics (Incom‐SPH) model is used to simulate the interactions between the free surface flow and a moving object. Incom‐SPH method is a two‐step semi‐implicit hydrodynamic formulation of the SPH algorithm and is capable of accurately treating the free surface deformations and impact forces during the solid–fluid interactions. For a free‐falling object, its motion is tracked by an additional Lagrangian algorithm based on Newton's law to couple with the Incom‐SPH program. The developed model is employed to investigate the water entry of a free‐falling wedge. The accuracy of the computations is validated by the good agreement in predicting the relevant hydrokinematic and hydrodynamic parameters. Finally, a numerical test is performed to study the influence of spatial resolution on the water entry features. The Incom‐SPH modeling coupled with the solid–fluid interaction algorithm could provide a promising computational tool to predict the slamming problems in coastal and offshore engineering. Copyright © 2008 John Wiley & Sons, Ltd.     

Flows formed after the passage of a discontinuous wave over a bottom drop

The solvability of the problem of the flow formed after a discontinuous wave has passed over a bottom drop is studied within the framework of the first approximation of shallow water theory. Solutions in which the total energy of the flow is either conserved or lost at the drop are considered. Stable self-similar solutions of five qualitatively different types are derived and their domains of existence are determined in the dimensionless parameter plane.     

水相中磷钼酸催化三组分合成烯丙基胺

以磷钼酸作为催化剂，芳香醛、胺和三丁基烯丙基锡三组分在水作为溶剂，室温下高产率的得到相应的烯丙基胺。     

二苯并噻吩在分散型钼催化剂和原位产生的氢存在下的加氢脱硫Ⅲ. 催化剂前身物、硫化氢、一氧化碳和水对反应的影响(英)

研究了水／ 甲苯乳化液中二苯并噻吩（ 硫芴） 在分散型钼酸、磷钼酸和四硫钼酸铵催化剂存在下的加氢脱硫反应． 反应在高压釜中于３４０ ℃及三种不同的气氛即Ｈ２ ，Ｈ２／Ｈ２ Ｏ和ＣＯ／Ｈ２Ｏ（ＣＯ 和Ｈ２Ｏ 经水煤气转换反应（ ＷＧＳＲ） 产生原位氢） 的存在下进行． 用ＧＣ和ＧＣＭＳ鉴定、分析了气体和液体产物的组成． 结果表明： 对硫芴的加氢脱硫反应，在分散型四硫钼酸铵催化剂存在下，原位产生的氢的效果仅比加入的氢气稍好，而在分散型钼酸和磷钼酸催化剂存在下，原位产生的氢远比加入的氢气有效． 实验结果还表明： 硫化氢能显著提高分散型钼酸和磷钼酸催化剂的加氢脱硫活性，但在分散型四硫钼酸铵催化剂存在下，硫化氢能促进加氢反应而抑制氢解反应． 一氧化碳和水均选择性地抑制氢解反应．     

聚乙烯醇和丙烯酸-β-羟乙酯水凝胶的摩擦学特性

合成水凝胶是由水溶性单体聚合得到的轻度交联的高分子柔顺链网络 .高分子交联网络与水之间的相互作用决定着水凝胶的物理化学性质[1,2 ] .水凝胶常应用于生物医学材料和生物传感器等方面 .如接触眼镜的材料就常用甲基丙烯酸 -β-羟乙酯和聚乙烯醇 (PVA)为主要成分的水凝胶 ,所以对其摩擦性质的研究会丰富对生物医用材料的认识 .关于水凝胶的摩擦性质的研究 ,除 Osada等[3] 研究了聚乙烯醇及一些天然水凝胶在几牛顿到几十牛顿的负载下的摩擦行为外 ,尚少报道 .PVA水凝胶的结晶度对其性能影响甚大 ,但他们没有涉及结晶度与 PVA水凝胶的摩…     

Optimization of the wash process and wash water recycling in the preparation of MgZnAl-CO3 layered double hydroxides

An MgZnAl-CO3 layered double hydroxide (LDH) slurry with Na2 SO4 as the by-product has been prepared by a co-precipitation method.The filtrates in the LDH washing process were collected according to their different levels of salinity.Filtrates with lower salinity can be used to wash a LDH slurry with higher salinity in the next cycle.Only in the final stages is pure water used.Recycling of the wash water in this way has been employed in a commercial production process,resulting in a water-saving of over 80%.The resulting MgZnAl-CO3-LDH product has a well-formed crystalline layered structure with a low content of impurities.