Rheological behaviour of processed avocado pulp emulsions

Shear rate vs. shear stress data were obtained on avocado pulp in water emulsions using a concentric cylinder rheometer and fitted to a power law model. Dilution, as volume fraction of water, had a pronounced effect on the apparent viscosity of the pulp emulsions and the Richardson equation, (η_R= exp.( a φ) for the emulsion viscosity fitted the data well. A mean slope coefficient, a , of 4.57 can be used as a first approximation. Enzymatic treatment (40°C, 1 h), is slightly more effective than thermal treatment (65°C, 1 h), in reducing the initial apparent viscosity of the pulp-water emulsions     

用傅里叶变换计算单缝衍射的光强分布

现代光学和通讯理论由于引入了傅里叶变换的方法，使计算光学系统和通讯系统的物像的对应关系简洁、清晰。该文用傅氏变换计算长为２ａ、照度为Ａ的均匀缝光源在观察面上的光强分布为Ｉ（ｘ）＝│Ｅ（ｘ）│＾２＝ＡＡ＾２ａ＾２（ｓｉｎ２πｆａ／２πｆａ）此方法也可运用于矩形孔、圆孔等。     

铂与氢、水和苯分子相互作用的量子化学研究

采用量子化学程序Gaussian98(A.9)从头算的B3LYP方法，全优化计算铂对氢、水和苯的化学吸附作用，得到了3种相关络合物PtX、PtXX和Ptxxx(X=H，H2O或C6H6)的平衡几何构型和电子结构信息，并探讨了这些络合物的成键性质，以及苯环与铂原子之间的分子轨道作用性质。结果表明，苯环与铂原子之间有很强的成键作用，并随着游离氢原子和水分子的参与，作用强度有很大变化。苯分子吸附在金属铂上，它的芳香性得到不同程度的降低，苯环被活化，苯环与铂原子之间形成η^2型π键络合物；水参与作用后，苯环与铂原子之间形成σ络合物；氢和水同时参与作用后，苯环与铂原子之间仅有很弱的π轨道作用。     

Relationship between mutagenic effects of drinking water and incidence of liver cancer in Fusui County--a prevalent area

Relationship between mutagenic activity of drinking water and incidence of liver cancer was studied in Fusui County with micronucleus technique in the root tips of vicia faba. Results showed there existed substance that caused chromosome aberration in the drinking pond water of Fusui County. Micronucleus effects on the root tips of vicia faba induced by the substance in different kinds of drinking water coincided with the incidence of liver cancer (r = 0.86, P < 0.05). It suggested the existence of these chemical mutants in the water may be one of the important factors that caused high incidence of liver cancer. It provided experimental evidence for the etiological theory of liver cancer caused by the pollution of drinking water.     

Computer Simulation of the Structure and Propertiesof Nanocrystals

This paper provides a computer modeling method for the study of nanocrystals. Structural features,such as the boundary component proportion, the reduced density proportion, the excess lattice parameter, and the radial distribution function, have been atomistically simulated. The energy and elastic properties also have been investigated. Simulation results indicate that the structure of grain boundaries in nanocrystals is different from those of the amorphous and the gas, or rather, it is a special structure with some degree of short-range order. Moreover, the structure of crystallites is not entirely the same as that in the perfect crystal lattice. The present simulation method may become one of the foundations of the theoretical study of nanocrystals.     

环境荷载联合作用下海上风电结构动力响应分析

为研究海上风电结构在复杂的海洋环境中承受环境荷载(风、波、冰、流)的联合作用时,结构产生的剧烈的动力响应问题。文章以三脚架基础海上风电结构为研究对象,采用ANSYS有限元软件建立其整体模型并进行荷载(风、波、流和风、冰、流)联合作用下的静力校核,通过对环境荷载联合作用下的三脚架基础海上风电结构进行瞬态分析,掌握其动力响应的特性及规律。结果表明:三脚架基础结构的一、二阶自振频率均为0.285Hz,在所选风机允许的频率范围内,可以保证整体结构不会与风机转动发生共振;风荷载在风、波、流荷载联合作用下主导控制结构响应的稳态波动,冰荷载在风、冰、流荷载联合作用下主导控制结构的稳态振动过程;塔筒顶端呈现的位移和加速度响应均远大于三脚架基础顶端;环境荷载联合作用下结构动力响应是环境荷载单独作用下动力响应叠加的结果。     

电能质量综合指标评价方法研究

文章首先回顾了现有电能质量指标的评价方法,包括单一监测点单一指标及多指标综合评价、同电压等级下多监测点单一指标综合评价方法;在此基础上,文章提出了一种包括所有电压等级的系统性多监测点多指标综合评价方法.算例分析结果表明:该方法适用于从时间域、空间域两个维度得到统一的电能质量综合指标,以实现不同区域电能质量综合指标的全面评估比较.     

基于语义分析的设计实体智能搜索

本文提出了在设计联盟组织过程中实现互联网上设计实体智能搜索的方法。根据对互联网上设计实体搜索问题的分析建立了设计实体智能搜索策略；定义了提取设计实体查询向量和描述向量的语义分析规则；提出了基于语义分析的设计实体智能搜索算法；最后编程实现了各项功能。