Feasibility analysis of membrane reactors – discovery of reactive arheotropes

A feasibility analysis methodology adopted from reactive distillation is applied to membrane reactors. A model is formulated to depict the reactive liquid phase composition on the retentate side of a continuous type membrane reactor. The effects of both the chemical reaction kinetics and the membrane mass transfer kinetics on the feasible products are elucidated by means of retentate phase diagrams and bifurcation analysis. The proposed method can be applied to various membrane processes, independent of the specific structure of the membrane. Two quaternary reaction systems are considered to illustrate the methodology. In the first hypothetical system, it is shown how selective membranes can influence the sequence of effective volatilities which in turn affects the feasible products of the system. In the second example of practical importance, i.e. the heterogeneously catalysed synthesis of propyl acetate coupled with permeation through a porous polycarbonate membrane, the dusty gas model is applied to describe the component fluxes through the membrane. For the latter reaction system, the existence of reactive arheotrope is demonstrated. Arheotropes represent mass transfer controlled feasible products of membrane separation process.     

川西低渗气藏单井地应力计算方法综合研究

四川盆地新场气田是一个低孔低渗的裂缝性砂岩气田，储层物性差，自然产能低，需经压裂后才能投产，压裂后气井增加的产能与压裂的效果密切相关。提前认识储层当前地应力的特征，有助于压裂设计时确定裂缝产状、缝长、缝宽等参数，减少储层水力压裂改造的盲目性，降低中、低渗透油气田开发的风险。通过大量测井资料的计算，确定了新场气田储层地应力的大小和方向，并综合采用微地震测量、岩石声发射资料、古地磁等岩心测试资料和水力压裂等多种方法进行交互验证，各种方法求得的地应力特征十分相近，说明利用测井资料求取储集层地应力原理简单，计算结果符合实际的地应力特征，是一种低风险研究计算储层地应力特征的方法，可以用于指导低渗透油气田的井网部署和储层的单井压裂改造。     

太湖流域主要湖泊的水域动态变化

利用GIS和遥感技术对不同时期的地形图和遥感影像数据进行处理,获取3个时期(1971,1988,2002年)的太湖流域主要湖泊的水域面积。结合多种文献资料,对太湖流域主要湖泊的水域面积变化进行了研究,并分析了引起水域面积变化的主要因素。结果表明,1971~2002年期间太湖流域主要湖泊的水域面积减少了188.87 km2;湖泊水域面积减少的主要原因是由于人类活动的影响。在实地调查研究的基础上,对合理利用与保护湖泊水资源的对策进行了探讨。     

面块切片解释方法应用实例探讨

面块切片是一种新的三维数据显示、解释方法，将它应用于安棚油田地震资料解释中和BBT油田识别小断层中。与常规解释方法相比，不仅大大提高了地震资料的解释效率，而且在识别小断层和小构造方面效果明显。     

分频解释技术在川西砂岩储层预测中的应用

分频解释技术是沿着储层或固定时窗对地震反射波各频率成分对应的调谐能量进行识别和成像,它避免了常规属性分析方法中的调谐陷阱,提高了识别薄储层的能力,能更客观地刻画地质体.在川西地区陆相隐蔽岩性气藏勘探中,存在调谐陷阱、波阻抗特征不明显、复杂地层结构中的有效薄储层不易识别等问题.为此,利用分频解释技术对川西地区侏罗系千佛崖组冲积扇相砾岩储层、上三叠统须四段河流三角洲相砂岩储层进行了描述.在多频率振幅叠加图上,冲积扇、三角洲水下分流河道等地质体形态和边界反映清晰;在单频振幅图上,清楚地显示出冲积扇内的辫状河道相薄层砾岩储层,与钻井结果相吻合,提高了储层预测精度.     

基于随机分析和概率预测的固定式海洋平台结构风险评估研究

对极端海况进行了环境荷载的联合概率分析。引入了整体不确定性和敏感性分析理论,利用非正态过程、具有不同相关性的多变量随机模拟技术,求解结构的失效概率。提出结构失效分析的新方法,并利用DNV提供的历史数据,对结构失效的后果做了适当分析。以埕北12-C井组平台为实例,对平台甲板高程(Air Gap)失效分析进行了实例计算。结果表明,使用多维联合极值分布理论及相应的求解方法,是离岸工程结构物风险评估的重要手段。     

Lean philosophy: implementation in a forging company

This research addresses the implementation of lean philosophy in a forging company with a focus on radial forging production flow lines. Here, the prime motive is to evolve and test several strategies to eliminate waste on the shop floor. In this research, a systematic approach is suggested for the implementation of lean principles. This paper describes an application of value stream mapping (VSM). Consequently, the present and future states of value stream maps are constructed to improve the production process by identifying waste and its sources. Furthermore, Taguchi’s method of design of experiments is pursued here to minimize the forging defects produced due to imperfect operating conditions. A noticeable reduction in set-up time and work-in-process (WIP) inventory level is substantiated. Finally, we conclude with a discussion of managerial implications and the future scope of research.     

一种基于知识地图集的知识管理系统模型框架

在分析知识管理、知识管理系统(KMS)的含义和知识地图集技术的特点的基础上，提出了一种基于知识地图集的KMS模型框架，并且分析了该模型框架中知识地图集的组成及功能，讨论了KMS中知识地图集和知识存储之间的关系。依据该模型框架，组织易于构建知识管理系统，实现知识资源的共享与充分运用。最后，通过一个实例分析进一步说明了该模型框架的应用。     

The Continuous Interpolating Self-organizing Map

The self-organizing map (SOM) [5] provides a general data approximation method which is suitable for several application domains. The topology preservation is an important feature in data-analysis and may also be advantageous for the evaluation of the data in a function approximation or regression task. For this reason the interpolated self-organizing map (I-SOM) adds an output layer to the SOM architecture which computes a real valued output vector. This paper presents an extension of I-SOM towards a continuous interpolation. It is compared to RBF and to the parametrized self-organizing map.