螺旋焊管在线自动测径装置

螺旋焊管在线测径是生产高标准焊管的重要检测装置，可以实时监控钢管管径。选用CCD传感器与计算机连接，组成钢管测径装置，能够较好地达到对钢管管径实时监控的目的。     

8098单片机在单相调压器中的应用

将8098单片机所特有的用软件来实现A/D,D/A及PWM信号输出的特性应用在模拟式移相电路中,展示了模拟式移相电路改造成具有智能化特点的一条有效途径。     

用于重离子核反应实验测量的纵向电场气体电离室

本文报道了一种新型的大动态范围，多叠层探测器系统组件之一的纵向电场气体电离室的构造，性能和在中能得离子核反应实验中的应用。     

棉/氨纶弹力织物低温一浴法染色

通过一种新型染色助剂的应用，有效地降低了氨纶分散染料的染色温度，使棉/氨纶弹力织物能在较低的温度下实行散／活性一浴法同色性染色，获得满意的染色效果。     

Characteristics of the reactive distillation column with a novel internal

A new catalyst loading method, in which catalyst particles are packed in a reactor with a novel internal, has been studied by measuring pressure drop, RTD, liquid holdup and mass transfer. It can be inferred from experimental results that the internal changes the conventional gas and liquid counter-current flow into a new cross-current flow, so the problems of excessive pressure drop and “flooding” are avoided. When pressure drop, liquid holdup, RTD and mass transfer coefficient are similar, the catalyst loading fraction of the new method is much higher than that of conventional methods. Furthermore, the reactive distillation reactor with the novel internal has advantages such as simple structure, low operating cost, and convenience for installation and removal of the catalyst.     

深基坑重力式沙袋堆叠挡土工程的实践

本文介绍了湛江金辉煌综合楼工程的深基坑应用沙袋堆叠作挡土结构的设计与施工     

基于互触发的Oracle细粒度数据保护和恢复的研究及实现

本系统的主要思路是利用Oracle的触发器、Flash Recovery Area等技术,结合J2EE技术,实现一套基于B/S架构的Oracle数据保护和恢复系统,包括权限管理、数据恢复、系统管理三大模块,旨在解决以下问题:(1)建立新的权限控制。Oracle自带的权限控制不够安全,本系统拟创建一套新的权限体系,作为对Oracle的权限的补充,使业务系统的数据使用起来更加安全;(2)建立新的数据恢复。用软件实现Oracle的数据实时恢复,在真正执行危险操作以后,对数据进行针对性地、迅速恢复;(3)实现互触发保护,避免"通过人为的方式直接去drop触发器"之类操作的实现。     

Discretized LKF method for stability of coupled differential‐difference equations with multiple discrete and distributed delays

Time‐delay systems described by coupled differential‐functional equations include as special cases many types of time‐delay systems and coupled differential‐difference systems with time delays. This article discusses the discretized Lyapunov–Krasovskii functional (LKF) method for the stability problem of coupled differential‐difference equations with multiple discrete and distributed delays. Through independently dividing every delay region that the plane regions consists in two delays to discretize LKF, the exponential stability conditions for coupled systems with multiple discrete and distributed delays are established based on a linear matrix inequality (LMI). The numerical examples show that the analysis limit of delay bound in which the systems are stable may be approached by our result. Copyright © 2011 John Wiley & Sons, Ltd.     

Molecular dynamics-based prediction of boundary slip of fluids in nanochannels

Computational modeling and simulation can provide an effective predictive capability for flow properties of the confined fluids in micro/nanoscales. In this paper, considering the boundary slip at the fluid–solid interface, the motion property of fluids confined in parallel-plate nanochannels are investigated to couple the atomistic regime to continuum. The corrected second-order slip boundary condition is used to solve the Navier–Stokes equations for confined fluids. Molecular dynamics simulations for Poiseuille flows are performed to study the influences of the strength of the solid–fluid coupling, the fluid temperature, and the density of the solid wall on the velocity slip at the fluid boundary. For weak solid–fluid coupling strength, high temperature of the confined fluid and high density of the solid wall, the large velocity slip at the fluid boundary can be obviously observed. The effectiveness of the corrected second-order slip boundary condition is demonstrated by comparing the velocity profiles of Poiseuille flows from MD simulations with that from continuum.