井眼倾斜角和倾斜方位对裸眼完井地层出砂的影响

结合等效塑性应变准则定量地研究了井眼倾斜角和倾斜方位对裸眼完井砂岩油藏出砂的影响。计算结果表明,在一定的应力和地层条件下,井斜角在0~45°时,随着井斜角的增加,井壁内的塑性应变最大值和塑性区范围都不断增加,出砂的趋势增大;当井斜角在45°~90°时,随着井斜角的增加,井眼内最大塑性应变逐渐减小,出砂趋势减小。井斜角相同,但井眼倾斜方位不同的井,井壁内产生塑性变形的区域不同,塑性变形的程度也不同,从防砂的角度,井眼,尤其水平井眼应该沿原地最小水平主应力方向,或尽可能靠近最小主应力方向。     

民国时期北京商业整体布局与三类商业街区

民国时期北京古都商业街以大型商业街、常规商业街、专业商业街的形态存在，具有强烈的时代印记。商业街的结构因百货业态的出现而向完善方向迈进。以个人技艺为动力的民族商业给商业街增添了活力，外国政治势力破坏了传统的商业街繁荣气氛。     

Push-Kanban – a kanban-based production control concept for job shops

Job-shop production in an individual and small-batch manufacturing environment demands producing simultaneously different products in many customised versions and in small numbers. The associated variability of the time-phased work content leads to a high degree of complexity and turbulence in the manufacturing process of such a production type. Therefore, production control becomes significantly more complicated, and many theories on how to cope fail in the real world. Despite the many technological and conceptual advances in the field of job-shop control over the past few decades, there is still a remarkable lack of practical control approaches for job-shop production. For this reason the Push-Kanban production control concept will be introduced in this article. It combines robust push scheduling along with a kanban-driven, decentralised inventory control mechanism to create a holistic control approach, integrating all production control tasks. Thus, it offers a feasible option for controlling job-shop production in industrial practice. This article examines the effectiveness of the concept by means of a simulation study based on real data.     

A class of distribution-free tests for two-way layout

In this article a class of distribution-free tests for the hypothesis of no row (treatment) effect in a two-way layout design, with several observations per cell, is proposed. The tests are based on U-statistics, constructed by considering minima of all possible subsamples of same size from each cell.The proposed class of tests is compared with the parametric test, Mack and Skillings test and Yate's test for two-way layout, in terms of Pitman ARE sense. It is seen that for the case of equal number of observations per cell, the proposed tests have better efficiency for exponential and uniform error distributions.     

辽宁“十二五”工业经济发展规划的战略思考——基于产业竞争力的视角

基于产业竞争理论分析辽宁工业经济发展的现状，针对其中存在的利润率低、工业内部配套能力弱、产业之间发展不协调和民间投资被挤出等结构性问题分析其产生原因，认为政府主导资源推动型的发展方式和政府产业规划的雷同性及路径依赖性是造成结构性失衡的主要原因。为此，建议政府在编制辽宁“十二五”工业经济发展规划时应考虑效益指标，按产业发展周期和要素、需求条件等规划重点发展产业，并处理好支柱产业与支撑产业、相关产业之间的关系。     

Production scheduling in SMT electronic boards assembly

This paper tackles the problem of scheduling in the assembly of SMT electronic boards. In particular, it focuses on a new scheduling method developed within the framework of an industry-university joint research project. The scheduling system aims at minimizing the makespan; this goal is achieved by reducing setup times and idle times of the machines. As an example, the outcome of a test carried out on a production mix made up of 10 board types is presented and analyzed in a summarized form.     

丰田生产方式在中国企业的实践探析

本文对我国汽车制造企业实施丰田生产方式的历程和现状进行了分析，提出了我国企业实施丰田生产体系时所遇到的主要问题和相关建议：在企业内部培养实施丰田生产方式的文化基础；发展工业工程；使用精益六西格玛工具；在人员素质不断提高的基础上，结合我国国情实施丰田生产方式。     

“生产的自然条件”与生产力发展的二重性——析马克思主义生产力理论之生态文明视角

马克思的生产力理论具有双重视角。唯物史观所谓的"生产力标准",是立足于工业文明的视角,在不考虑"生产的自然条件"前提下而得出的价值观;因此,它尽管赋有"决定历史发展的终极动力"地位,毕竟只能在普遍性的意义上存在。而在对现实的生产力发展模式的研究中,马克思立足于后工业文明的生态文明视角,创立了"生产的自然条件"范畴,并据此界定了生产力发展的现实意义:生产力能否实现与"生产的自然条件"之良性结合。这就为人类从工业文明的生产方式转型为生态文明的生产方式指明了路向。     

技术进步对我国经济增长作用的实证分析

为考察改革开放以来我国技术进步对经济增长贡献份额的变化情况，选用1979—2003年的相关数据进行实证分析。研究表明，改革开放以来我国技术进步对经济增长的贡献率偏低，经济增长主要是靠资本投入和劳动投入（特别是资本投入）来拉动的。因此，今后应不断增强我国企业的技术吸收能力和自主创新能力，实现从粗放型增长方式到集约型增长方式的转变，增强技术进步对经济增长的促进作用。