选矿药剂专家见百熙

见百熙同志是冶金部长沙矿冶研究所选矿药剂室主任、副研究员。1946年,北京辅仁大学化学系研究生毕业,获理学士、理论硕士学位。曾多年从事药物化学的教学和研究,1958年,调原中国科学院矿冶研究所从事选矿药剂研究至今。     

Capacity of edible seaweeds to modify in vitro starch digestibility of wheat bread

The capacity of two species of edible seaweeds (Wakame, Undaria pinnatifida and Chondrus, Chondrus crispus) to modify the rate of white bread starch digestibility by an in vitro digestion system, as well as glucose retardation index and apparent viscosity were studied. Both Algae showed different effect on glucose retardation index. While Wakame did not make difficult dialysis of glucose, it only retained 2.50 +/- 2.99% to respect a negative control. Chondrus impaired the diffusion of a 28.70 +/- 2.35% of glucose, which are very close to those of citrus pectin (31.50 +/- 4.12%). On the other hand, viscosity of Chondrus solution was higher than Wakame and slightly lower than citrus pectin solution. The analysis showed a very low content of total starch in Wakame (0.51%) and Chondrus (0.47%). Algae reduced the digestion of white bread starch. The profile of starch hydrolysis was characteristic for each alga. Glycaemic index estimated from the degree of starch hydrolysis within 90 min was low (79) with respect to white bread (value 100). Seaweeds showed a suitable capacity to modify in vitro starch digestibility of white bread. Chondrus produces a more pronounced response. This fact seem to be due to different composition of samples.     

空分设备计算中的几个问题

本文是研究在计算空分设备中所产生的几个方法问题.其中包括有关于在计算中利用各种热力图表使氮和氧的热焓相一致的同题,有关于如何决定空分设备中双级精镏塔的釜液纯度的计算问题,本文也涉及在双塔分离设备中利用多余液氮的可能方案.一、氧、氮、空气和氮—氧混合物在图表中热焓计算始点的一致性.     

气体放电显示器及其现状

本文叙述了各种类型的气体放电显示器,并扼要地介绍了目前已投放市场的一些新型显示器。     

Effect of alkali metal hydroxides on the morphological development and optical properties of ceria nanocubes under hydrothermal conditions

Nanocrystalline cerium(LV) oxide (CeO2, ceria) particles were produced via the hydrothermal treatment of cerium nitrate hexahydrate with various alkali metal hydroxides (MOH: M = Li, Na, K). Experimental conditions such as [MOH], reaction temperature, and reaction time were studied. Particle morphology as well as size of crystallites was precisely controlled by choice of experimental conditions. While rod-shaped particles were obtained at 120 degrees C, well-defined nanocubes were formed at higher temperatures regardless of the choice of MOH. Examination of particle growth kinetics, in the final stages of crystallization, showed that particle growth rate is controlled by two different mechanisms. Grain boundary diffusion controls the particle growth in the presence of NaOH with an activation energy of 113.8 kj/mol and surface diffusion for LiOH ad KOH with the activation energy of 43.0-150.9 kj/mol, respectively. In addition, the particles exhibit strong violet and blue emissions at 400 nm and 370 nm. The former emission originates from excitation of a wide band gap of CeO2. The latter one is attributed to the trivalency of the cerium ion and appears to be sensitive to all the experimental conditions studied. Both extending reaction time and increasing temperature reduce the intensity of the 370 nm emission and increase the intensity of the 400 nm emission.     

潮汐河口概化感潮河段的数值模拟试验

为解决潮汐河口水动力数值模拟中常见的模拟困难问题,以珠江黄茅海河口和崖门水道为例,采用Delft3D二维水动力模块进行数值模拟试验,在仅考虑其基本纳潮特性条件下,概化崖门上游感潮河道,模拟黄茅海河口和崖门水道的水动力过程,并与实测数据进行对比分析。结果表明,在潮汐河口水动力数值模拟中,当缺乏上游感潮河道实测资料,或为节省资源而缩减计算范围而导致无法将实际潮区边界作为上游边界时,概化方法可为解决其相关模拟困难问题提供参考。     

桩端后注浆技术及其在工程中的应用

目前高层建筑大多采用钻孔灌注桩基础，而钻孔灌注桩最大的缺点是，桩底虚土较难清理；桩身泥皮影响侧摩阻力进一步发挥；或为达到良好的持力层不得不穿越厚实的饱和性土层至坚硬的风化层，这对钻进，清孔等均不利。桩端后注浆技术较好地解决了这一系列难题。杭州红楼饭店改扩建工程正是由于成功地运用了这一技术，起到了固结桩底虚土，提高桩端承载力的作用。     

50cm~3排量二冲程发动机润滑油的品质及性能

本文对需要润滑的发动机部件作了简短叙述后,主要讨论了二冲程发动机的润滑方法以及润滑特性(活塞的高热负荷,缸体上的气口及润滑油被燃油稀释等现象). 本文解释了50cm~3排量的二冲程润滑油的各种性质,包括一般润滑油的性质以及适用于50cm~3排量二冲程发动机的特殊润滑油性质.然后阐述两种相互补充的CEC试验方法: (1)(CEC L.19.T.77)试验法:停止冷却,使活塞与气缸胀紧,以此作为基础进行试验,在这种比较严酷条件下评价润滑性. (2)一般性能试验法(CEC L.06.T77):以模拟实际运转条件的台架试验为基础,依据燃烧室中的积炭,排气系统的沉垢,火花塞的损伤进行评价.