IMAGE仪器MRX站A/D板电路分析及故障排除

通过对IMAGE仪器MRX站A／D板的电路分析，利用综合测试和分析诊断程序，并借助示波器和万用表，针对不同的故障，找出A／D板产生故障的根源，切实有效地排除故障。     

聚苯乙烯泡沫塑料板在三清干渠改建工程中的试验

高台县友联灌区三清干渠地处严寒地区，且渠道沿线地质条件较差，影响渠道衬砌改建质量的关键技术问题是防冻胀设计。由于三清干渠附近缺乏垫层料，采用垫层置换防冻胀投资高，且垫层质量难以控制。设计人员根据有关规范要求．结合渠线地质条件．采用聚苯乙烯泡沫塑料保温板进行防冻胀试验，较好地解决了冻胀问题。     

部件试验模态综合的简便方法

本文将一种基于完备模态基的模态综合技术应用于子结构的试验模态综合,获得成功。这种半试验半理论的模态综合方法是一种较为简便的、要求试验工作量较小的试验模态综合法,因为它只要求测量子结构的振动模态和频率即可。数值仿真结果表明,这种简便的试验模态综合法是行之有效的。     

DZX-2B型电子学综合实验装置常见故障与分析

介绍DZX-2B综合实验装置的组成、常见故障，及如何快速、准确的判断并排除故障的方法。     

铝基印制电路板制造工艺研究

此文对一种进口铝基印制电路板的制造工艺流程进行了介绍,对所采用的制造工艺技术进行了较为详细的论述。     

对未来我国覆铜板业技术发展的战略与任务的探讨

对未来十年我国覆铜板业技术发展的战略与技术开发重点任务进行了探讨。     

Homogenization of hardness distribution and distortion in high pressure gas quenching

Quenching with gases rather than oil or other liquid media has the advantages of reducing the risks concerning health and environment, while simultaneously homogenizing the quenching results and minimizing distortion due to a wide range of possible process parameter variations and the pure convective heat transfer. In this contribution, a coupled solution for increasing homogenization of quenching results within high pressure gas quenching will be presented. In the first stage, an experimental test facility was set up for flow investigations and in the second stage a numerical simulation model was generated. The numerical and experimental results of the flow through the chamber were compared for several boundary conditions. Finally, after complete verification of the simulation, the model may be used to assist in parameter variation for optimization of homogeneous high pressure gas quenching.     

Seismic Physical Modeling Technology and Its Applications

1. Introduction Seismic physical modeling technology is an important method for the research on seismic exploration theory and methods. In seismic physical experiments, the earth, mantle or field site are scaled down to physical models according to the similarity principle, and then the seismic field and its variation are observed in the laboratory for the research work on the theories and methods of the earth structure, earthquake forecasting, energy and mineral resource exploration, and engi…     

A Model for Flooding Prediction in Circular Tubes

Flooding phenomenon limits the stability and the flow of a liquid film falling along the walls of a channel in which a gas is flowing upwards.As known, the entrainment effect can completely prevent the liquid to fall from its natural flow. The present work proposes a new mechanistic model for the prediction of the onset of flooding in vertical and inclined pipes in the presence of obstructions, as well as taking into account the viscosity effect. The good performance of the model in the different geometrical conditions and for variable viscosities of the liquid component assesses the validity of the hypothesis that the instability of a wavelike disturbance limits the countercurrent flow in a channel.     

半导体元件清洗技术浅谈

随着社会的进步和科学技术的迅猛发展,对洗净技术的要求也越来越高。清洗方式多种多样,但最主要的是突出在喷射清洗和超声波清洗两大方面,应用于全国各行各业,并且也得到了明显进步。