Calorimetric determination of the enthalpy change for the binding of methyl orange to poly(vinylpyrrolidone) in aqueous solution

Thermodynamic parameters have been determined for the interaction of methyl orange and poly(vinylpyrrolidone) in aqueous solutions containing tris, tris and hydrochloric acid, or water only. Enthalpy changes were determined by use of a flow microcalorimeter. Free energy changes were calculated from the results of equilbrium dialysis studies. The results are interpreted in terms of the behaviour of poly(vinylpyrrolidone) in these systems. Analysis of data shows that the hydrophobic interactions in the systems are in the order: tris > wateronly > tris-HC1.     

宽带接入服务器的选择配置和应用

本文主要分析了影响宽带接入服务器性能的各种因素，介绍了如何选择宽带接入服务器，并针对REDBACK公司的SMS1800和UNISPHERE公司的ERX1400两种典型宽带接入服务器说明如何进行配置，为应用宽带接入服务器提供参考。     

循环冷却水自动加药控制系统

针对工业循环冷却水的处理问题，开发了循环冷却水自动加药控制系统。重点介绍了该系统的总体结构，控制方案及管理软件设计，该系统的投用可大大提高循环冷却水处理的自动化水平并可取得显著的经济效益。     

炼油厂区内新建项目改扩建施工现场灭火器配置的分析

在对石油化工改扩建工程施工现场火灾危险因素识别评估的基础上，判定现场火灾危险等级、火灾类别，对灭火级别和保护距离进行验算，提出施工现场灭火器选型和配置方案。     

飞轮快速静平衡工艺

介绍了一种适应多品种小批量生产类型的飞轮快速静平衡工艺。     

均匀设计在遗传算法中的应用研究

通过分析均匀设计和遗传算法的内在关系，指出从某个角度上可以把均匀设计看作是遗传算法的一种特例，并针对遗传算法初始参数众多、难配置的问题，提出了利用均匀设计优化配置选择参数的方法，在一定程度上可以避免遗传算法参数配置的盲目性．仿真试验结果证明了该方法是合理、可行的。     

从销钉起家的“正业电子”

本文介绍了参观“正业电子有限公司”的概况。     

基于旋量和臂形标志的机器人运动学逆解计算

讨论了用旋量和指数积公式计算PUMA类型6自由度机器人运动学逆解的方法。在子问题的计算过程中，通过引入臂形标志来选取关节变量的合理解，以得到运动学逆解的唯一解。这种方法避免了对无效解的计算，可以减少计算量，提高计算效率。通过一个实验机器人的运动学逆解计算验证了算法的有效性。     

NMR studies of poly(2-hydroxy ethyl methacrylate-co-2-vinyl pyridine)

Copolymers of 2-hydroxy ethyl methacrylate-2-vinyl pyridine (H/V) of different composition were synthesized by free radical bulk polymerization using azobisisobutyronitrile (AIBN) as an initiator under nitrogen atmosphere. The copolymer compositions were calculated from ¹H NMR spectra. The reactivity ratios for H/V copolymers obtained from a linear Kelen-Tudos method (KT) and nonlinear error-in-variables method (EVM) are r_H = 0.50 ± 0.10, r_V = 1.04 ± 0.08 and r_H = 0.55, r_V = 1.06 respectively. The complete spectral assignment of methine, methylene, methyl, carbonyl, and aromatic carbon regions in term of compositional and configurational sequences of H/V copolymers were done with the help of ¹³C{¹H} NMR, distortionless enhancement by polarization transfer (DEPT), two-dimensional heteronuclear single quantum coherence (HSQC) along with total correlated spectroscopy (TOCSY). © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008