INCREASE IN REFRACTORINESS IN CERAMIC BODIES IN INTERRUPTED HEAT TREATMENT1

The increase in refractoriness referred to here is usually termed freezing. The study was undertaken to overcome the tendency of pyrometric cones to set or freeze when subjected to prolonged heat treatment when the temperature is more or less fluctuating. The work includes a study of the freezing tendency of some natural clays, of several pottery bodies, and of pyrometric cones. A body was developed that does not freeze under the treatment that produces the phenomenon in the other materials tested but the cause is not established.     

电解法处理废水的研究进展

本文综述了近年来电解法处理废水的科研及技术进展 ,探讨了电解法水处理技术的发展前景     

煤化工装置空分氧泵变频器防晃电探讨

介绍煤化工装置空分氧泵变频器的电气控制原理,分析氧泵变频器因系统晃电而导致跳停的原因,通过对变频器增加直流支撑装置,确保空分氧泵变频器稳定运行。     

日本煤转化技术的进展

本文介绍了日本在煤气化联合循环发电、煤加氢热解，煤加氢液化和水煤浆等煤转化技术方面是最新进展及中度厂部分试验结果，同时也介绍了日本最近提出的煤气化联合燃料电池新转化工艺的方案。     

中国海水淡化工程进展

本文介绍了中国已建成投产海水淡化装置的数量、产量及各种淡化方法所占比例。到目前为止,海水淡化技术主要应用于沿海岛屿和沿海地区电力、化工等企业。随着海水淡化技术的发展和应用规模的扩大,淡化水生产成本将与市政供水价格接近,海水淡化技术将不仅用于沿海岛屿和企业供水,而且将大规模地应用于市政供水。     

汽车用塑料的研究进展

介绍聚丙烯、尼龙、聚氨酯等几种主要塑料和其它塑料在汽车上的应用和研究进展。简述汽车用塑料的国内外应用发展状况,指出了汽车用塑料的发展趋势和今后的研究重点。     

IN SITUMEASUREMENT OF PHOTOCHEMICAL REACTIONS IN MICRODROPLETS

A technique based on fluorescence scattering by microdroplets has been shown to be capable of measuring instantaneous rates of photochemical reactions in microdroplets. The technique has been applied to study trans -to-cis photoisomerization of thioindigo dye in single solution droplets suspended in an electrodynamic balance. Through an analysis it is shown that the concentration distributions of isomers remain uniform in a droplet under the experimental conditions; thus, the scattered fluorescence intensity from the droplet is proportional to the concentration of solely fluorescent trans isomer molecules. The steady-state scattered fluorescence intensity versus incident laser power data have been used to interpret the kinetics of the reaction. The results show that the rate constants can be determined from the scattered fluorescence intensity versus time data. The technique is particularly suitable when only one species fluoresces in the photo-reactive wavelength range while other species present in a droplet do not.     

美国在水泥应用方面的研究动态

介绍了美国近年来在水泥应用方面的研究动态。其基本方针是从材料科学,尤其是脆性材料理论出发,通过改变水泥基材料的组成和改进成型方法,使硬化水泥石的结构趋于合理,从而大幅度提高水泥的各种性能,最终达到部分取代陶瓷、金属、塑料和木材等其它材料的目的。这种新型的水泥材料被称为ACBM(Advanced Cement Based Materials)。美国已建立了ACBM研究中心,并出版了名为“Cementing The Future”的专门刊物来介绍这方面的科技新信息。     

我国汽车用塑料的技术进展

综述了PP、PE、工程塑料在汽车工业中的应用,着重介绍了PP的改性及其PP汽车专用料的技术进展。     

1996年江苏省塑料工业技术进展

描述了江苏省塑料行业的概貌，介绍了江苏省塑料行业各领域（如热塑性塑料、热固性塑料、降解塑料、成型加工、塑料制品、塑料助剂等）取得的技术成果、研究进展和生产装置水平。     

DISSERTATIONS AND THESES IN DRYING WRITTEN IN CZECHOSLOVAKIA IN THE PERIOD 1975 - 84

Research and development of drying processes and equipmect has a long tradition in Czechoslovakia (1). There are at least 10 top reoearch centers where drying of varicus materials has been studied. Remarkable attention to drying theory and application is also paid at Czechoslovak universities which yields numerous theses dealing with various aspects of the drying process. The total of 52 M.Sc. theses oriented to drying and/or dryers had been published in the last decade. Moreover, 22 Ph.D. theses were carried out in the same period. This represents an important source of theoretical and experimental results. However all theses had been mitten in the Czech or Slovak language, and therefore their wide international application is rather limited. They are summari-zed in the following list.     

DISSERTATIONS AND THESES IN DRYING WRITTEN IN CZECHOSLOVAKIA IN THE PERIOD 1975 - 84

Research and development of drying processes and equipmect has a long tradition in Czechoslovakia (1). There are at least 10 top reoearch centers where drying of varicus materials has been studied. Remarkable attention to drying theory and application is also paid at Czechoslovak universities which yields numerous theses dealing with various aspects of the drying process. The total of 52 M.Sc. theses oriented to drying and/or dryers had been published in the last decade. Moreover, 22 Ph.D. theses were carried out in the same period. This represents an important source of theoretical and experimental results. However all theses had been mitten in the Czech or Slovak language, and therefore their wide international application is rather limited. They are summari-zed in the following list.     

纳米二氧化钛在塑料中的应用进展

介绍了纳米二氧化钛的制备及其改性技术，并重点论述了纳米二氧化钛作为增强增韧填充剂、抗菌剂及催化剂等在塑料中的应用研究进展。     

MOISTURE DISTRIBUTION IN SPHERICAL FOODS IN MICROWAVE DRYING

Abstract

Moisture distribution in spheres of potato (Solanum tuberosum) and yam (Dioscorea japonica) tubers during microwave drying was investigated. Moisture variation at various locations within the samples was experimentally determined for different drying times. A numerical simulation model was developed based on a modified form of Lambert's law for microwave penetration in spheres and on moisture transfer in both liquid and vapor phases. This model was used to study various factors influencing moisture distribution. Moisture profile during microwave drying was strongly influenced by non-uniform microwave energy distribution within the foods. The core moisture contents were lower than other parts of potato and yam spheres of the various sizes tested in this study (2.6 cm to 6.0 cm diameter). The sphere radius to microwave penetration ratio (2αr_o) was an important parameter affecting the moisture profile in spherical foods. For 2αr_o of less than 2.0, the moisture content in the center of potato and yam spheres was markedly lower than the rest of the food, but for 2αr_o between 2.5 and 4, moisture contents at the center and close to the surface were lower than the average moisture content.