Prediction models for multiphase-flow-induced corrosion of API X80 steel in CO2/H2S environment

In the offshore oil and gas industry, mainly focusing on the use of rigid or flexible pipes of subsea infrastructure applied to risers or flowlines, one of the greatest difficulties is the interpretation of the combined effects of the various correlated phenomena (hydrodynamic effects of intermittent flow, the effects of corrosivity of the environment in addition to variations in pressure, temperature, and dynamic loading). On the basis of this scenario, defining the degree of severity of each of the correlated system variables becomes of fundamental importance for establishing reliable criteria for selecting materials for subsea application. The established flow pattern directly affects the corrosion rate (or the pipe material mass loss), but the balance of other variables including possible changes in the physical and transported fluid chemical properties may increase the damage up to an order of magnitude, which is a piece of information normally not foreseen in design criteria. Therefore, to improve the understanding of the corrosion study influenced by multiphase flow, a testing loop was designed and assembled at the Corrosion and Protection Laboratory of the Institute for Technological Research, in which API X80 steel coupons were positioned in locations with a 0° and 45° inclinations. Tests were conducted by varying the partial pressure of the gaseous phase containing blends of CO₂ and H₂S with N₂ balance, mixed with the liquid phase containing light oil and heavy oil in water with salinity (NaCl)-simulating oil well conditions with 80% water cut. The main objective of this study is to establish models that can predict the corrosion intensity in conditions close to those obtained experimentally. To achieve results, the multiple regression and Box–Cox transformation methods were applied. These models will make possible damage prediction and optimization of matrix parameters for the multiphase-loop test.     

REST API技术及在移动通信网络管理中的应用

介绍了目前最炙手可热的REST架构风格，该风格顺应Web2.0的兴起，完美的匹配了云计算时代来临的可扩展要求，在各种应用场景中都得到了充分的表现。根据其技术特点，分析了该风格的API在移动通信网络管理中的应用，从网管系统内部、网管系统之间以及网管系统与上层APP应用之间等多方面对是否适用于REST风格以及如何在合适的位置使用REST API进行了分析。     

Investigation of a few oxazolone molecules as corrosion inhibitor for API5LX60 steel in 1N H2SO4 solution

Corrosion is recognized as a notable problem in oil sector where API5LX60 steel transmission pipelines are in frequent use. In this report, three oxazolone derivatives as potential corrosion inhibitors were investigated on API5LX60 graded carbon steel in 1N H₂SO₄ solution in stagnant conditions at concentrations 50–200 ppm. Gravimetric weight loss coupons and electrical resistance corrosion monitoring techniques performed on test samples showed inhibitory properties with best at 200 ppm inhibitor concentration. The results further revealed that the degree of inhibition was concentration dependent. Inhibitor I exhibited the highest inhibition efficiency of 90.70% at 200 ppm concentration. Statistical analysis using multiple linear regression model procreated high R² value of 0.998 and p-value < 0.0001 asserting a smooth linear dependence of inhibitor efficiency on oxazolone concentration and weight loss of the steel. Again, surface analysis affirmed the formation of protective coating of inhibitor on steel surface. Furthermore, the oxazolone inhibitor adsorbed physically on the steel surface and obeyed the Langmuir isotherm which is evident from the linear correlation coefficient value of 0.9992.     

颚式破碎机数字化开发平台

在Solid Works平台上采用VB及API技术开发出颚式破碎机数字化开发平台.介绍了颚式破碎机数字化开发平台的结构、专家系统在破碎机方案设计中的应用及颚式破碎机结构参数的优化设计方法.该平台集设计计算、绘图、参数优化、分析于一体,实现了并行及敏捷设计.     

基于C++ Builder的串口通信程序实现方法

在工业控制领域,计算机经常通过串口实现与单片机、DSP、PLC等的通信,并被广泛应用。文章叙述了在C++ Builder 6环境下串口通信的3种实现方法,并着重介绍了Windows的API通信函数。     

媒体播放器的制作技术

为了设计出功能强大的媒体播放器,对制作媒体播放器中左右音量、循环播放、播放时间与进程的显示等几个关键技术进行了探讨,并给出了主要的实现流程和功能代码,利用这些方法,用户可以根据需要制作出操作方便的媒体播放器．     

基于车辆位置服务的安卓APP开发

利用移动互联网技术为汽车用户提供基于位置的服务是智能汽车的一个重要内容.当前汽车服务领域,提供的服务只是定位导航等基本服务,针对汽车用户提供更为个性化服务的系统几乎没有.为了方便汽车用户确定车辆位置,实时了解车辆内的信息状况,在深入分析基于车载端移动应用现状的基础上,提出并实现了一套基于Android的车辆服务系统的设计方案.系统由信息管理模块和地图模块组成,信息管理模块提供了用户车辆内甲醛浓度、PM2.5浓度和PM10浓度等信息的显示,地图模块实现了对用户车辆位置定位、行车导航以及附近服务搜索的功能.该系统在实际运用中运行稳定,定位精度较高、路线规划准确,和传统的地图相比可实时刷新车辆位置,其功能的设计更适用于汽车驾驶者.     

Web数据库访问技术的探讨研究

WEB数据库访问技术越来越受到人们的关注,文章介绍了几种WEB数据库访问的实现方法:CGI,API,JSP,ASP以及ASP.NET,论述了各自的优缺点。并且详细介绍了ADO.NET。ADO.NET是微软最新的WEB数据库访问技术,文章通过一个具体的实例来操作SQLServer2000数据库,其方法和技巧对指导WEB数据库应用系统上有一定的实用价值。     

基于USB的TMS320F2803x片内Flash在线编程技术

详细介绍了应用在线编程技术的系统配置,应用程序代码的格式转化的方法步骤.给出应用程序代码的读取存储和在线编程的流程以及程序代码的搬运、烧写、校验的源程序.该技术成功应用于实际工程中,给系统升级维护提供了诸多便利.