A human gastric simulator (HGS) to study food digestion in human stomach

The objective of this study was to develop an in vitro stomach model, the Human Gastric Simulator (HGS), for studying gastric digestion of foods. The HGS is designed in such a way as to simulate the continuous peristaltic movement of stomach walls, with similar amplitude and frequency of contraction forces as reported in vivo. The HGS mainly consists of a latex vessel, simulating the stomach chamber, and a series of rollers secured on belts that are driven by motor and pulleys to create a continuous contraction of the latex wall. It also incorporates gastric secretion, emptying systems, and temperature control that enable accurate simulation of dynamic digestion process for detailed investigation of the changes in the physical chemical properties of ingested foods. The simulated gastric contraction force demonstrates a similar pattern as in vivo stomach forces. The precise control of gastric secretion and emptying and the adjustable mechanical forces in the HGS provide a useful tool to study transformation of food constituents under simulated physiological conditions.     

人的认知可靠性模型分类及实验研究

通过秦山核电站操纵员的模拟机实验,讨论了人的认知可靠性模型的参数和分类的确定方法．给出了模拟机实验操纵员响应时数据的处理分析方法,确认了响应时影响分类的主要因素是规范化拟合标准偏差,它是威布尔分布拟合的隐含参数一应用本文的数据处理和分类方法对秦山模拟机实验数据进行分析,取得了秦山操纵员认知可靠性的参数,将结果与美国IAEA实验结果进行比较,得到了基本一致的结论。     

微波宽带矩阵放大器的噪声特性模拟

微波单片矩阵分布电路作为一种新型宽带电路,具有易于集成、高增益、超宽带、平坦的频率响应、良好的输入输出匹配、低噪声等优点。本文简要介绍了所研制的通用微波单片矩阵分布放大器噪声特性模拟软件,实例表明,软件简单有效,具有实用价值。     

红外仿真用的新型“视场光栏”机构

文中论述了红外目标仿真装置中用的“视场光栏”机构的作用，提出了一种新颖的用步进电机直接驱动两个带有“光学凸轮槽”的金属叶片相对转动的“视场光栏”机构，比国外同类机构具有机构简单、易于制造、易于控制、成本低等优点。