改性乳化沥青的发展和应用概况

综述了改性乳化沥青的发展及应用概况,重点讨论了改性乳化沥青的生产、制备工艺、稳定性影响因素,并对国内外改性乳化沥青的应用情况加以概述。     

The Present Status and Potential of Kraft Lignin-Phenol-Formaldehyde Wood Adhesives

Kraft lignin (KL), a phenolic polymer formed during the kraft pulping process, is presently burned as a low value fuel. For decades, researchers have attempted to use KL as an inexpensive substitute for phenol in phenol-formaldehyde (PF) resins, but no one has produced a commercially satisfactory KL-PF resin. This paper reviews the literature on the present status of KL-PF adhesives and makes recommendations on needed research.

Kraft lignin solutions are complex mixtures which have broad molecular weight distributions, high viscosities, relatively low reactivities, and low solubilities. Attempts to overcome these inherent problems include methylolation of lignin to improve reactivity, the use of co-solvents to improve solubility, and ultrafiltration to yield more homogeneous molecular weight fractions. Future research efforts need to focus on understanding the fundamental chemical and physical properties of kraft lignin and its resins. The search for an economic lignin-based wood adhesive should continue.     

国外硬岩连续采矿技术的新发展

本文综述国外硬岩连续采矿技术的最新进展,包括:钻孔劈裂破岩、液压冲击式采矿、等离子爆破、自动钻爆和高压水射流破岩系统。     

储罐中缓蚀剂的应用方法

缓蚀技术是减轻石油化学工业中各类油、气、水储罐内腐蚀的有效方法,但国内目前应用尚不普遍,原因之一是尚未找到较适宜的加入方法,使缓蚀剂的应用可以经济地和长时间地起作用,本文综述了储罐内缓蚀剂的各种应用技术,重点介绍在涂层中加缓蚀剂的技术,基于其溶解性或离子置换特性,在实际使用时缓蚀剂可持久、稳定地释放出来。这后一类技术可能是在储罐内应用缓蚀剂的最好方式之一。     

全封离式低,中功率CO2激光器

本文回顾了过去十年来封离CO_2激光器使用射频(RF)激发技术方面的进展,并讨论了这一技术现状以及技术与市场的挑战。     

连续铸造技术的发展概况及展望

回顾国内、国外连续铸造技术的发展概况；指出开发和完善“近终形连铸”、“单晶连铸”、“高效连铸”、“连铸坯热送热装”等技术和基于连铸技术研制新型材料是连铸技术发展的主要方向。     

合成基础油的性能与应用

综述了聚醚、合成烃、酯类油、磷酸酯、硅油及氟油等合成基础油的性能及其应用情况。     

信号情报接收机的发展现状及趋势

信号情报系统主要由天线，接收机和处理器三大部分组成，接收机是信号情报系统的一个重要组成部分。本文主要对几种信号情报接收机的原理和现状作了介绍，并对其发展方向提出看法。     

Heterogeneous object modeling: A review

A review on the recent development in heterogeneous object modeling is provided in this paper. General problems and prevalent solutions to the modeling of heterogeneous objects are investigated. Vigorous heterogeneous object representations are roughly classified into three major categories: evaluated models, unevaluated models and composite models. We reveal their similarities and study their strengths and weaknesses in terms of the representational capacities, intuitiveness, exactness, compactness, efficiency and other criteria. Different design paradigms are briefly reviewed to provide an overview of the state-of-the-art in heterogeneous object design. Finally, open problems and possible future directions are discussed.     

1997年度大中型钢铁企业节能工作情况综述

第九次节能工作会议后，冶金工业掀起了节能降耗的新高潮。各企业都从本单位 实际出发，狠抓节能降耗工作，节能增效成绩显著。大中型钢铁生产企业全年节能３５０万ｔ标煤，超 出１９９７年初冶金工作会议确定的全行业节能３００万ｔ目标。创造效益２８亿元。