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邱西 《江汉石油职工大学学报》2010,23(4):23-27
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。 相似文献
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S. Vigneswaran H. Prasanthi H. B. Dharmappa 《Korean Journal of Chemical Engineering》1996,13(6):565-572
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. 相似文献
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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. 相似文献
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造纸厂负荷优化调度系统 总被引:2,自引:0,他引:2
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。 相似文献
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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. 相似文献
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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. 相似文献
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