THE RELATIONSHIP BETWEEN HAZE AND THE SIZE OF PARTICLES IN BEER

Haze measurements have been obtained for suspensions of polystyrenelatex particles of known diameter using two light scattering instruments which measure at angles of 90° and 13° respectively. The results agree well with the theory of light scattering and demonstrate the significant effects of particle size and angle of detection upon the instrumental values for haze. This information has been used to correlate the particle size distributions of a number of beers, as measured by Coulter Counter, with the corresponding, measured haze values.     

回转体拉深件毛坯直径的简捷计算及误差分析

通用的回转体拉深件毛坯直径的计算公式繁琐，不蝗记忆，特别是利用中线尺寸常出现小数点使计算复杂，本文针对此问题分别推导出了利用中线尺寸和不用中线尺寸时，毛坯直径的简捷计算公式。并进行了误差分析，最后用实例对简捷计算方法的正确性给予了验证。     

大中型风力发电机组可靠性研究

研究了大中型风力发电机组的可靠性，讨论了可靠性指标的分配，可靠性设计的四个重要方面、可靠性试验计算机模拟。     

Effect of Particle Size on Monometallic and Bimetallic (Au,Pd)/C on the Liquid Phase Oxidation of Glycerol

The influence of metal particle size of monometallic and bimetallic supported catalysts (Au, Pd, Au–Pd)/C was studied using as a model reaction the liquid phase oxidation of glycerol. By tuning the metal particle size from 2 to 16 nm a progressive decrease of activity and simultaneously an increase in the selectivity to sodium glycerate was observed. Moreover, the influence of the temperature was studied and it was found that by increasing the temperature, only with a large particle size the formed glycerate was retained and not over-oxidized to tartronate.     

工业化陶瓷超滤膜的表征

以液-液排除法测定工业化陶瓷超滤膜的孔径及孔径分布，比较了两种渗透体系对测定结果的影响；用已知分子量标准物质考察了不同膜的截留行为，获得了各膜的切割分子量值，并分析了截留率与孔径的对应关系，为工业化陶瓷膜的开发提供依据。     

激光粒度分析仪测定氢氧化铝细颗粒方法的探讨

针对马尔文2000型激光粒度分析仪在氢氧化铝分析中对25μm粒径以下细颗粒的分析不太敏感，难以满足氧化铝生产分解过程对粒度控制的要求，对试验样品采用一些非常规的特殊处理方法，以提高细小颗粒在处理过样品中所占的体积百分比；研究了不同的样品处理方式对分析结果的影响。试验结果表明，只有对洗涤、过滤后的湿样进行分析，才能对分解料浆样品中的细颗粒的粒度分布进行准确地分析，得到满足试验和生产过程控制精度的结果。     

Asymptotic stress intensity factor density profiles for smeared-tip method for cohesive fracture

The paper presents a computational approach and numerical data which facilitate the use of the smeared-tip method for cohesive fracture in large enough structures. In the recently developed K-version of the smeared tip method, the large-size asymptotic profile of the stress intensity factor density along a cohesive crack is considered as a material characteristic, which is uniquely related to the softening stress-displacement law of the cohesive crack. After reviewing the K-version, an accurate and efficient numerical algorithm for the computation of this asymptotic profile is presented. The algorithm is based on solving a singular Abel's integral equation. The profiles corresponding to various typical softening stress-displacement laws of the cohesive crack model are computed, tabulated and plotted. The profiles for a certain range of other typical softening laws can be approximately obtained by interpolation from the tables. Knowing the profile, one can obtain with the smeared-tip method an analytical expression for the large-size solution to fracture problems, including the first two asymptotic terms of the size effect law. Consequently, numerical solutions of the integral equations of the cohesive crack model as well as finite element simulations of the cohesive crack are made superfluous. However, when the fracture process zone is attached to a notch or to the body surface and the cohesive zone ends with a stress jump, the solution is expected to be accurate only for large-enough structures.     

1960年前黄河下游河槽淤积物粒径组成分析

利用1999年汛前深层钻孔取样资料和历年淤积实测大断面资料分析出1960年前无三门峡水库影响的“自然”水沙情况下,下游河道主槽淤积物中d≥0.1 mm以上泥沙占50.7%,比1960-1999年大30个百分点,这种泥沙在下游的淤积比高达83.1%,比0.05 mm以上泥沙的淤积比高39个百分点。指出应在黄河中游寻找出0.1 mm以上的粗泥沙集中来源区作为近期水土保持的重点区域。     

醋酸纤维素—纤维素增强膜的结构特征和分离性能

本文描述了醋酸纤维素－纤维素大孔增强超滤膜的结构特征一分离性能之间的关系。详细论述了膜材料含量和粘连剂含量及其分子量对膜结构和性能的影响。论述了不同配方铸膜液的膜，其孔径，水通量和截留率随操作压力的变化规律。实验证明这种高强度的ＣＡＣ膜经多次重复使用后，其结构性能保持完好。     

Microstructure evolution during metal forming processes

Recrystallization and grain growth evolutions during metal forming processes are considered. Coupling between the thermo-mechanical and microstructure processes is realized. Die forging of a rear-axle flange is simulated numerically on the base of the finite element method. Material parameters of the models are obtained experimentally. The influence of interpass and holding times on grain size distributions in the end product is shown.