Hydrogen production from solid reactions between MAlH4 and NH4Cl

Solid reactions between alkali aluminum hydrides (MAlH₄, M = Li or Na) and NH₄Cl (at mole ratio 1:1) at 170 °C were investigated quantitatively using temperature programmed reaction (TPR), thermo-gravimetric analysis (TGA), differential scanning calorimetry (DSC) and x-ray diffraction (XRD). The release of 3 mol of H₂ from per mole of MAlH₄ was measured, corresponding to 5.6 wt.% H₂ capacity for the NaAlH₄/NH₄Cl system and 6.6 wt.% for LiAlH₄/NH₄Cl, respectively. By ball milling of the precursor compounds prior to the mixing, the reaction proceeded fast and NH₃ production as the by-product could be avoided. The quick solid reactions may be attributed to the low melting temperatures of MAlH₄ and the exothermic nature of the reactions. The reaction mechanism was also discussed.     

板片空间结构动力特性与非线性地震反应分析

采用ＦＥＭ 法分析了一个单层板片空间结构的动力特性及其在地震作用下的双重非线性时程反应。推导了三维桁元、梁元和三角形板壳元在ＵＬ描述下的双重非线性切线刚度矩阵,通过对增量形式虚功方程作线性化处理来减少计算量,考虑了梁／杆与板对应节点定位偏差和节点焊接安装误差,进而编制计算程序。     

热变形后的冷却方式对白口铸铁组织与性能的影响

对经４０％热度变形后不同冷却方式白口铸铁的组织与性能进行观察，并对其进行了分析，所得结果对白口铸铁的应用具有重要的指导意义。     

Application of ultraviolet photografting technology to acrylamide/polyethylene to improve the interfacial adhesion of polyethylene/unsaturated polyester resin composites

This study was divided into two sections. In the first part, we used ultraviolet (UV) rays in the wavelength range 300–400 nm to remove the hydrogen atom from polyethylene (PE) and worked with a hydrophilic monomer to complete the grafting action. In the second part, we used the best conditions derived from the previous film grafting and applied them to fibers to achieve excellent adhesion for application in composite materials. For the handling process of the PE film, we initially used acrylamide (AM) as the monomer and then added acetone and benzophenone (BP) to form a reactive solution for the advanced photografting process. In general, the optimum concentrations of the monomer solutions obtained from the photografting of PE films were 2 mol/L of AM and 0.2 mol/L of BP. The UV irradiation time was fixed at 30 min. The optimum grafting conditions achieved in the first part of this research were applied in the photografting process for the PE fiber bundles in the second part. The unsaturated polyester (UP) resins were spread over the outer surfaces of the modified fibers. This was done to strengthen and increase the interface between the UP resins and the modified PE fiber. During the curing experiment of the grafted fiber bundles in the resin coatings, the best material quality was obtained under the following conditions: hardener content = 0.85% (relative to the UP resin weight), oven temperature = 80°C, and time frame = 5 h. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2009     

川中磨溪气田嘉二气藏高压井下节流工艺现场试验效果跟踪

川中磨溪气田嘉陵江组属异常高压气藏，埋藏深度3100m，地层压力67．67MPa，现有成熟井下节流工艺只适用于节流压小于35MPa的气井。不能用于这类超高压气藏，为此，针对嘉二气藏特征，开展了高压井下节流工艺应用研究。通过工具的研制、改进以及室内试验后，在磨41井投入了现场应用，取得了很好的效果。文中拟通过对磨41井高压节流效果的跟踪，进行高压井下节流工艺在磨溪嘉二异常高压气藏的适应性分析。     

DDedDBS中的一种启发式规则分配算法

本文讨论分布式演绎数据库系统中的规则分配问题。文中给出了五种有效的启发式规则分配算法，它将规则库表示成一个有向的层次结构图，并依据此图按自上而五方式分配规则。本算法的时间复杂度是Ｏ，其中ｍ是系统中的站点个数，ｎ是规则条数。     

依靠科学管理与技术进步实现全面节能降耗

抚顺特殊钢有限公司是“八五”期间国家节能先进企业。本文重点介绍了抚钢以提高经济效益为中心，通过强化能源管理，依靠科技进步，搞好节能技术改造，开展节能降耗工作的做法和经验。并提出了今后抚钢能源管理工作的设想。     

230kA铝电解供电系统及其数字控制技术的研究

本文简要叙述了当前铝电解供电系统存在的问题 ,讨论了基于PLC的 2 30kA铝电解供电系统的数字PID控制技术的实现方法。     

我国奶粉厂技术改造概述

在充分调查国内奶粉现状的基础上，借鉴从国外引进设备的奶粉厂设计和使用经验，结合我斩实际情况，并溶入多年的奶粉帮设计经验，综述了从收奶工序始至干燥序止的奶粉生产过程。在提高奶粉质量的同时，降低奶耗、能耗，实现降低吨粉成本的７点改造措施。这些已通过实践２验证的措施，不但为老奶粉厂的技术改造指出了方向，亦可作为新建奶粉厂设计的借鉴。