聚驱后油田剩余油潜力分布规律研究

综合考虑剩余油饱和度、厚度、渗透率、孔隙度、相带、原始含油饱和度、注水井距离等7个因素,利用模糊综合评价方法,以大庆油田北一二排西块为例,计算了该区块8个沉积聚驱后剩余油潜力,并分析聚驱后剩余油潜力分布特征.结果表明,聚驱后仍有比较大的剩余油潜力;聚驱后剩余油潜力主要集中在高渗透、厚度较大、剩余油饱和度较高、河道砂等高级别沉积相带的区域;聚驱后在潜力值为0～0.2区间内的剩余油储量很小,潜力值为0.4～0.6区间内的剩余油储量最大,而潜力值为0.6～0.8区间内剩余油储量次之.     

新媒体环境中品牌粉丝效应形成机理研究

随着新媒体技术的不断发展以及消费模式的变迁,电子商务呈现出新型业态,对品牌新媒体营销提出了新的挑战。消费者的品牌消费已经从传统的功能性需求转移到更多的价值需求,营销领域的“粉丝效应”应运而生。本文即研究新媒体环境中粉丝效应的形成机理。结合新媒体环境,文中描述了粉丝效应的概念及内涵,探讨了新媒体环境中新型电商的业态及价值产出模式的变革,提出了粉丝效应的实现过程并实证分析了粉丝效应的形成机理。文中提出粉丝效应实现的三种影响因素,包括品牌体验、品牌认同、品牌形象。研究结果表明,品牌体验对品牌认同有正向影响;品牌认同分为个人品牌认同及社会品牌认同,个人品牌认同对社会品牌认同有正向影响;品牌认同对品牌形象有正向影响;品牌认同和品牌形象均对品牌粉丝效应有正向影响。     

Crossed Modules and Quantum Groups in Braided Categories

Let A be a Hopf algebra in a braided category . Crossed modules over A are introduced and studied as objects with both module and comodule structures satisfying a compatibility condition. The category of crossed modules is braided and is a concrete realization of a known general construction of a double or center of a monoidal category. For a quantum braided group the corresponding braided category of modules is identified with a full subcategory in . The connection with cross products is discussed and a suitable cross product in the class of quantum braided groups is built. Majid–Radford theorem, which gives equivalent conditions for an ordinary Hopf algebra to be such a cross product, is generalized to the braided category. Majid's bosonization theorem is also generalized.     

Multi-objectives for incremental cell formation problem

Over the past three decades considerable amount of research work has been reported in the literature of Group Technology (GT). Most of the research work is concerned with formation of machine cells and part families. This is because cell formation is considered to be the most complex and the most important aspect of Cellular Manufacturing System (CMS). Due to NP completeness of cell formation problem, many heuristics have been developed. These heuristics are developed for both single as well as multiple objectives for the comprehensive cell formation. Here all part types and machine types are considered at a time for cell conversion and that all cells are designed at a single point in time. But planning and implementation of most cell conversions in industry are incremental ones, and not comprehensive. This issue has not been addressed in GT literature adequately. In this paper we consider multiple objectives for incremental cell formation and develop, a lexicographic based simulated annealing algorithm. The performance of the algorithm is tested over several data sets by taking different initial feasible solutions generated using different heuristics.     

Numerical simulation of dynamic sand dunes

The physics of granular materials is interesting from many points of view because they exhibit a wealth of phenomena that have both fluid and solid aspects [C.S. Campbell, Annu. Rev. Fluid. Mech. 22 (1990) 57, H.M. Jaeger, S.R. Nagel, R.P. Behringer, Phys. Today 494 (1996) 32]. Recently a difficult pattern was observed if sand falls in the space between two plates and passes an obstacle [Y. Amarouchene, J.F. Boudet, H. Kellay, Phys. Rev. Lett. 86 (2001) 4286]. The interesting behaviour occurs on top of the obstacle where a dynamic dune with a parabolic tip is formed. Inside this parabola, a triangular region of non- or very slow flowing sand is observed. Using factor analysis it is possible to extract latent parameters from a dynamic process. Applying a three factor model we can clearly identify the inner triangle (1st factor) and the outer parabolic pattern (3rd factor). The second factor we interpret as shock wave. Most interactions between particles take place in a relatively small region. We show that the pattern formation process depends on the restitution coefficients (particle–particle and particle–obstacle) and also on the particle size. These findings cannot be observed if standard velocity profiles are used to analyse the data. Our findings show, that most interactions take place in a relatively small area correlating with the particle size. If the interactions between different particles and particle–obstacle are elastic the formation of a non-flowing triangular region is more difficult as if inelastic collisions are used. The factor curves also clearly show that a pattern formation process has to be finished, before the next pattern can be formed.     

熵与系统有序性研究综述

系统有序性是维系系统基本特征,保证系统生存和发展的关键,是衡量系统内在质量的重要指标.文章首先介绍了信息熵的基本概念,论述了它与有序性之间的关系.然后,从物理学、信息论、自组织理论以及耗散结构等多个方面对系统有序进行了分析.进而,论述了系统有序性的几种测度方法,比如概率测度、微观态测度、时效质量测度等.在系统分析中,必须结合实际的系统情形,综合考虑各种系统要素对系统有序性的影响.     

基于组合评价的长三角城市基础设施投资绩效研究

城市基础设施投资绩效的合理评价是进行科学投资决策的重要依据。为了对长三角25个城市基础设施投资绩效进行客观、合理的评价,建立了基础设施投资绩效评价指标体系,选取2009年截面数据采用组合评价法进行综合评价。该方法首先使用超效率DEA、熵权TOPSIS、因子分析三种方法得出各自结果下的排名,在验证了各评价方法具有一致性的前提下采用模糊Borda综合评价法得出各城市的最终排名。组合评价方法弥补了单一方法的不足,有助于得到更客观合理的评价结果,为有关城市和部门把握基础设施投资绩效和未来决策提供参考。     

基于GIS的河道、蓄滞洪区洪水演进动态可视化仿真研究

结合地理信息系统(GIS)技术和三维仿真图示技术,探讨了基于GIS的河道、蓄滞洪区洪水演进可视化仿真技术原理与方法,分析了洪水演进可视化模型的建立过程,设计出河道、蓄滞洪区洪水演进系统的总体结构及开发模式,并介绍了系统具体功能的实现.本仿真模型在实例中得到了成功的应用,可为防洪减灾决策提供快捷、直观形象的信息支持.     

A theoretical analysis of formation flight as a nonlinear self-organizing phenomenon

This study analyses the existence, stability and self-organizationof formation flight utilized by migrant birds. Air is approximatedas an incompressible inviscid flow, while birds are modelledas elliptically loaded lifting-lines. Application of conventionalwing theory leads to newly derived, basic equations that describethe problem as a dynamical system of multiple wings interactingwith each other through induced flow field. Formation flightis defined as the steady-state solution of the basic equations,in particular the solution that all the birds fly at the samespeed. In the case of a prescribed thrust, constant transverseinterval between adjacent birds, and a flock of physically identicalbirds, analytical study of the basic equations reveals the factsthat (1) formation flight is self-organized and (2) this formationflight is stable. The new implication is that a configurationof formation emerges as a result of nonlinear dynamical interactionbetween many birds and that this nonlinear dynamical systemdoes not exhibit chaotic behaviour. Numerical calculation hasalso been done for cormorant-type birds with the same transverseinterval between flock members. The proposed numerical schemequickly converges to very accurate results owing to the recentlyderived, closed-form expression of induced velocity distributionaround an elliptically loaded lifting-line. Transverse intervalsbetween birds are found to be a more important factor than thenumber of birds. Configurations of formations are found to beinverted U rather than inverted V. In these formations everybird enjoys the same amount of drag reduction.     

基于混沌的三江平原月降水时间序列分析

三江平原是我国最大的淡水沼泽区,近年来降水的减少是导致湿地减少的一个重要的自然因素.别拉洪河是三江平原上比较有代表性的沼泽性河流.以别拉洪水文站的降水序列为例,通过相空间重构,分别计算了序列的关联维、最大Lyapunov指数以及Kolmogorov熵等几个序列特征量.计算表明:三江平原月降水序列中是存在明显的混沌特征的,这为以后建立三江平原月降水的混沌预测模型提供了理论依据.