球差对调焦函数的影响

红外导引头成像光斑测试仪系统的球差对成像光斑质量有很大的影响,降低了光斑的能量集中度.通过对球差因素影响的研究,构造的调焦评价函数能更精确地分辨最佳像面,从而通过自动聚焦寻找最佳像面位置,是测试仪评价其光学系统质量的一个重要环节.     

A New Cellular Automata Model Considering Finite Deceleration and Braking Distance

We present a new cellular automata model for one-lane traffic flow. In this model, we consider the driver prejudgment according to the state of the leading car. We also consider that the vehicle deceleration capability is finite and the braking distance of the high-speed running cars cannot be ignored, which is not considered in most models. Furthermore, comfortable driving is considered, too. Using computer simulations we obtain some basic qualitative results and the fundamental diagram of the proposed model. In comparison with the known models, we find that the fundamental diagram of the proposed model is more realistic than that of the known models.     

THE COMPACTION OF TIME-DEPENDENT VISCOUS GRANULAR MATERIALS CONSIDERING INERTIAL FORCES

In the present paper, compactions of time-dependent viscous granular materials are simulated step by step using the automatic adaptive mesh generation schemes. Inertial forces of the viscous incompressible aggregates are taken into account. The corresponding conservation equations, the weighted-integral formulations, and penalty finite element model are investigated. The fully discrete finite element equations for the simulation are derived. Polygonal particles of aggregates are simplified as mixed three-node and four-node elements. The automatic adaptive mesh generation schemes include contact detection algorithms, and mesh upgrade schemes. Solutions of the numerical simulation are in good agreement with some results from literatures. With minor modification, the proposed numerical model can be applied in several industries, including the pharmaceutical, ceramic, food, and household product manufacturing.     

测定烟草中总挥发酸含量的正交试验研究

利用正交试验设计和单因素实验方法研究了烟草中总挥发酸的测定。结果表明,该项检测的最佳条件为:称取烟样2 g,调节蒸馏液的初始酸度pH3.0,蒸馏9~11 min接收馏出液400~500 mL,设置滴定终点pH 8.4。在此条件下对不同类型的烟叶进行测定,挥发酸含量差异明显。方法的相对标准偏差为2.36%~4.82%,不同烟叶样品的加标回收率为96.5%~107.0%。     

新型抗干扰迈克尔干涉条纹自动计数仪

介绍了一种迈克尔孙干涉条纹自动计数仪，该装置具有良好的稳定性和很强的抗干扰能力。     

四级自动复叠系统压力保护装置的试验研究

针对五元混合工质四级自动复叠制冷循环系统启动压力过高和降温速率缓慢的问题,搭建了试验装置;设计了适合四级自动复叠循环系统的一种压力保护装置;分析了对系统压缩机吸排气压力和降温特性的影响。试验结果表明:所设计的压力保护装置能起到优化压缩机吸排气压力、加快降温速率的作用。     

电饭锅自动控温电路的设计和安装

本文紧紧抓住学生对“自动控温”这一普通现象的好奇 ,积极引导学生去探索和研究 ,使学生在掌握“自动控温”原理的基础上 ,按照自己的意愿和设想来设计一个电路并能动手组装和检验。     

用有限元自适网格控制结构应力分析的精度

本文涉及有限元结构应务分析精度控制的三个基本方面：１）自适应的有限元网格自动生成技术；２）有限元应力分析的误差估计：３）用单元尺寸场将误差分布用于形成新网格。