中和缓蚀剂Gibchem5911G的工业应用

叙述了中和缓蚀剂Gibchem5911G的缓蚀机理，以及缓蚀剂在中国石油大庆石化公司化工一厂裂解老区装置裂解气压缩机EC-301段间后冷器中的使用效果。通过对缓蚀剂注入前后EC-301段间后冷器中工艺凝液的pH值与总铁含量进行对比分析，可以看出该缓蚀剂可以改善压缩机段间后冷器中工艺凝液的pH值，能够有效地抑制后冷器腐蚀的发生。     

八面河油田近年注水开发工作的实践与认识

八面河油田油藏类型多样,开发方式多样,其中注水开发储量占全油田动用储量的61%。近年来,为改善注水开发油藏开采效果,保持产量稳定,油田针对各区块注水开发中存在的问题,在面4区面5块、广北8块、面14区沙三上采取了完善注采井网,注水井注氮调剖,水井动态调水以及改善水质等方面的工作,初步取得了较好的效果。     

Implications of particle size to transient stage of deep bed filtration

This study was aimed at investigating the effect of particle size, mostly in the submicron range, on break-through stage of filtration. Latex beads, with diameters ranging from 0.46- to 2.967-μm were filtered through filter grains of diameters 0.1-, 0.175- and 0.45-mm. Experimental conditions were chosen so as to obtain breakthrough curves. The experimental results showed that the initial efficiency follows the pattern reported by previous experimental and theoretical studies, i.e., lower efficiency for 0.825-μm particles which fall in the range of critical size. However, the particle removal during the transient stage increased with an increase in particle size for the range of sizes studied. This pattern is qualitatively confirmed by the theoretical predictions of Vigneswaran and Chang (1986) model. This study also provides experimental verification of the effect of the ratio of particle size and grain size at different stages of filtration.     

二维直线运动平台几何误差建模与数字化分析

针对二维直线运动平台的定位精度受到绕X、Y、Z三个方向转动产生的角位移误差和沿着这三个方向的线位移误差的影响,采用一种基于三维模型的数字化方法对这些几何误差进行分析。通过参考坐标系和齐次变换矩阵建立二维直线运动平台几何误差运动学模型,并基于误差模型对运动平台的各项几何误差进行分配、计算和合成。基于以上误差分配原则对运动平台使用的导轨提出形位公差要求。通过上述工作,在虚拟样机设计阶段能对所设计结构几何误差进行预测,为后续精密运动的设计提供可靠的参考。     

PLC在叉车油缸测试系统中的应用

本文介绍了用PLC控制叉车液压油罐测试系统的原理。说明了如何使用级式语言编制PLC控制程序的方法并且给出了测控系统的软，硬件设计方法。对于研制用PLC控制的试验测控系统具有较高的参考价值。     

支持GPU的Flash3D技术

3D图形技术的应用早已十分广泛．随着互联网的发展,越来越多的应用被推广到互联网上,但涉及3D的应用却不多,近年来,多种新技术的发展给基于Web的3D图形技术注入了新的活力．本文主要研究了基于AdobeFlash平台的Web3D技术．首先介绍了Flash3D的工作原理,然后介绍了相关的一些3D引擎,最后基于其中的一个3D引擎研究了创建3D场景的一系列关键技术,并实现了一个演示范例．     

造纸厂负荷优化调度系统

以造纸厂生产实际为背景,给出了间隙式生产设备－蒸球优化调度的方法。仿真结果表明,该方法在满足纸浆实际需要的前提下,可以节能降耗。     

Combined Petri net modelling and AI-based heuristic hybrid search for flexible manufacturing systems—part II. Heuristic hybrid search

This two-part paper presents modelling and scheduling approaches of flexible manufacturing systems using Petri nets (PNs) and artificial intelligence (AI)-based heuristic search methods. In Part I, PN-based modelling approaches and basic AI-based heuristic search algorithms were presented. In Part II, a new heuristic function that exploits PN information is proposed. Heuristic information obtained from the PN model is used to dramatically reduce the search space. This heuristic is derived from a new concept, the resource cost reachability matrix, which builds on the properties of B-nets proposed in Part I. Two hybrid search algorithms, (1) an approach to model dispatching rules using analysis information provided by the PN simulation and (2) an approach of the modified stage-search algorithm, are proposed to reduce the complexity of large systems. A random problem generator is developed to test the proposed methods. The experimental results show promising results.     

Estimating the orientation of Stage I crack paths through the direction of maximum variance of the resolved shear stress

Our formalisation of the Shear Stress-Maximum Variance Method takes as a starting point the hypothesis that, in ductile materials subjected to fatigue loading, the crack initiation planes, i.e. the so-called Stage I planes, are those containing the direction experiencing the maximum variance of the resolved shear stress. From a computational point of view, the most remarkable implication of the above assumption is that, as soon as the variance and covariance terms characterising the considered load history are known, the effective time needed to estimate the orientation of the critical plane does not depend on the length of the load history itself. Further, such a computational efficiency is seen to be associated with an high-level of accuracy in estimating fatigue lifetime of both plain and notched engineering components, this holding true under constant as well as under variable amplitude uniaxial/multiaxial fatigue loading. In this scenario, by assuming that the orientation of Stage I planes can directly be determined through the orientation of Stage II crack paths, the present paper investigates whether, independently from the degree of multiaxiality and non-proportionality of the applied loading history, the direction of maximum variance of the resolved shear stress is also capable of accurately estimating the orientation of Stage I crack paths.     

基于都市发展阶段论的城市居住隔离研究

本文归纳并总结我国居住隔离研究的现状,从研究成果及应用性、研究层面及针对性和规划对策三方面评述居住隔离研究存在的问题,在此基础上引入并剖析都市发展阶段论与居住隔离的内在关联,结合我国城市化特点构建基于都市发展阶段论的居住隔离研究框架,探讨我国居住隔离问题的应对策略,并着重论述框架中各类居住隔离问题的混居措施。