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.     

CNC微功能优化磨削过程

~~CNC微功能优化磨削过程@Konrad Trachsel @Walter Fabris @潭汝谋~~     

缓解电话中心话务员压力的技巧与方法

在我们与员工的谈话中，问到目前感觉如何?有什么困难？得到的答案经常是：压力太大!在日常工作中，经常听到有人抱怨：压力太大!那到底什么是压力，又是什么造成了压力?     

A Study of AlN Films Prepared by Arc Ion Plating

Hexagonal AlN films have been obtained by arc ion plating at different negative biases ,X-ray diffraction and scanning electron microscopy results show that AlN films with smooth surfaces and (002) preferred orientation are obtained at low biases ,whereas those with coarse surfaces and (100) preferred orientation are obtained at high biases,The formation mechanism of AlN is analyzed and the experiment results are discussed,The effect of bias on adhesion strength has also been examined.     

MRIL—P在长庆油田的应用

核磁共振测井技术是20世纪末最新的测井技术之一。由于其测量信号不受固体骨架的影响，观测范围具有可选择性，以及油气水在核磁共振特性方面的显著差异而能够得以识别，从而克服了以体积模型为基础的传统测井方法受井眼，岩性及地层水矿化度影响的缺陷，使得诸如复杂岩性，低孔低渗，低电阻等油气藏用常规测井方法难以解决的复杂问题得以解决。     

RFID智能巡检系统在沈阳燃气股份有限公司中的应用

沈阳煤气事业创建于1923年,是国内最早使用和生产煤气的城市之一.据不完全统计,沈阳市民用燃气总户数为103.4万户,其中燃气管道用户81.4万户,液化石油气用户22万户.煤气成为了城市生活中不可缺少的物质,遍布城市大街小巷的煤气管网承担着向千家万户输送煤气的任务,煤气管网质量的好坏决定着是否能保证煤气安全地输送到使用单位.一旦出现管网泄漏等故障,若不能及时发现和维修,后果不堪设想.     

高度有序多孔氧化铝模板的制备工艺与生长机制的研究

采用二次氧化法制备出高度有序的多孔氧化铝模板，结合扫描电镜和原子力显微镜对其结构、形貌进行观察和表征。研究了铝箔预处理和温度等对多孔氧化铝模板孔洞有序性的影响，讨论了有序孔洞的自组织生长机理。     

可编程系统芯片（SOPC）发展策略

深亚微米技术和超深亚微米技术的发展使电子工业正在向可编程系统芯片（SOPC）设计转移。针对SOPC全新的设计流程，本文提出了基于IP的SOPC设计集成平台概念和设计策略，以及基于FPGA/CPLD的SOPC实现方案。