Van der Waals型立方状态方程的改进——Ⅱ体积平移及多参数方程

体积平移是改进ｖａｎｄｅｒＷａｌｓ型立方状态方程，使之能精确预测液相密度的一种有效方法。采用多参数方程能同时较准确地计算蒸气压和液相密度。本文介绍这两种方法近年来的主要进展。     

水煤浆代油的技术与经济分析

介绍了水煤浆的发展过程，制造原理，提出实际应用过程中要解决的几个技术问题，预测了水煤浆替代石油将产生的巨大经济效益，提出发展我国水煤浆产业的设想，着重分析了广州市水煤浆代油的必要性和可行性。     

超细晶粒钢及其焊接性

介绍了超细晶粒钢的特点,针对这些特点,讨论了超细晶粒钢的焊接性,其中包括HAZ性能、焊缝性能、HAZ和焊缝的裂纹倾向等。     

建筑土建施工过程中的质量控制方法研究

在进行建筑土建施工时,要随时关注质量问题。对于施工过程中存在的问题,要认真进行分析并及时解决,做好质量把关工作。本文主要针对建筑土建施工过程中的质量控制方法进行了分析和探讨,提出了几点意见和建议。     

爆炸所致地面运动的仿真

本文提出了一个由爆炸地震引起的地面运动的理论仿真方法。将一个运动参数的时间变化过程转化为具有时变振幅的一个纯随机振荡问题，运用地震运动传递具有无特征尺度的分形结构和地运动时域信号具有统计自相似性的概念，提出地面运动随机平稳噪声的时变曲线是一条分形曲线的假设，根据随机振荡 函数功率谱满足指数关系的实验结果。引入Weiersterass-Mandelbrot(W-M)函数，给出了爆炸所致地面运动的仿真方法和过程，地面竖向位移的理论仿真结果与实验测试结果在统计规律上具有较好的一致性。     

Existence results for the three-point impulsive boundary value problem involving fractional differential equations

In this paper, we consider the existence of solutions for a class of three-point boundary value problems involving nonlinear impulsive fractional differential equations. By use of Banach’s fixed point theorem and Schauder’s fixed point theorem, some existence results are obtained.     

Preparation and characterization of novel hybrid thermoplastic poly(ether urethane)/poly(vinylidene fluoride) elastomers,and their application as solid polymer electrolytes

A comb‐like polyether, poly(3‐2‐[2‐(2‐methoxyethoxy)ethoxy]ethoxymethyl‐3′‐methyloxetane) (PMEOX), was reacted with hexamethylene diisocyanate and extended with butanediol in a one‐pot procedure to give novel thermoplastic elastomeric poly(ether urethane)s (TPEUs). The corresponding hybrid solid polymer electrolytes were fabricated through doping a mixture of TPEU and poly(vinylidene fluoride) with three kinds of lithium salts, LiClO₄, LiBF₄ and lithium trifluoromethanesulfonimide (LiTFSI), and were characterized using differential scanning calorimetry, thermogravimetric analysis and Fourier transform infrared spectroscopy. The ionic conductivity of the resulting polymer electrolytes was then assessed by means of AC impedance measurements, which reached 2.1 × 10^?4 S cm^?1 at 30 °C and 1.7 × 10^?3 S cm^?1 at 80 °C when LiTFSI was added at a ratio of O:Li = 20. These values can be further increased to 3.5 × 10^?4 S cm^?1 at 30 °C and 2.2 × 10^?3 S cm^?1 at 80 °C by introducing nanosized SiO₂ particles into the polymer electrolytes. Copyright © 2006 Society of Chemical Industry     

Crude Oil Desalting Using Hydrocyclones

Dilute dispersion/emulsion of ultrafine water droplets containing a variety of salts is usually present in crude oil. It is very useful to remove the water and the dissolved salts, so that corrosion, plugging, and fouling of equipment can be prevented. Electrical desalter is an effective method in crude oil desalting. In order to overcome the shortcomings of electrical desalting system, such as larger equipment volume, complex high tension electricity system, a new process of crude desalting that are based on hydrocyclone technology is designed. Preliminary industrial experiments have been carried out to prove the feasibility of desalting using hydrocyclone. The effects of several dimensionless units, such as Reynolds number, Euler number and pressure drop ratio were studied. An increase in inlet Reynolds number will decrease the pressure drop ratio. With an increase in inlet Reynolds number, Euler number increases gradually. Under the condition that Reynolds number of inlet is ranging from 5000 to 5800, the water concentrations can decrease from 5 vol%  8 vol% to less than 0.40 vol% and the salt concentrations is reduced from less than 8 mg L⁻¹ to 3 mg L⁻¹ after handled.     

变频控制器在电厂锅炉给粉机转速控制系统中的具体应用

本文通过燃煤机组锅炉给粉机变频调速控制系统的介绍，叙述了变频控制器的工作原理和性能特点以及在电厂中的应用前景。