清代齐齐哈尔文化流人三次重大集结略论

有清一代,伴随清廷流人政策的调整,发遣齐齐哈尔的流人在康末雍初、乾末嘉初、同末光初等几个历史时期,呈现相对集中的态势。因其所处地域、环境、待遇的趋同,一定程度导致文化流人行为、心态均具备较强的向心力,由此形成了文化流人的集结活动。依据史志资料,就齐齐哈尔文化流人在齐齐哈尔的三次集结进行梳理总结,以揭示齐齐哈尔文化发展走向。     

巴彦浩特盆地构造特征及含油气远景初步评价

巴彦浩特盆地是-个上叠于阿拉善地块之上的复合盆地．盆地可划分成五个-级构造单元,十二个次-级构造单元。盆地中发育有五种构造地层组合．断裂对盆的形成和发育起明显的控制作用,巴彦乌拉山断裂为-深切基底的铲地正断层,该断裂控出了西部拗陷带的形成,其活动强度自北向南减弱．伊南断裂带控制了伊和凹陷的形成,该断裂带中段活动强度最大;查汗断裂具明显的左旋走滑特征。盆地中发育多种构造样式,主要有：叠瓦状冲断层、滚板构造、牵引褶皱、铲形正断层、滚动背斜、“垒-堑”构造等。石炭系是盆地内主要的生油层系,它广泛发育并具良好圈闭条件的东部地区和南部地区有较好的油气远景。     

Production planning of mixed-model assembly lines: a heuristic mixed integer programming based approach

Process technology capabilities are becoming increasingly important as flexible manufacturing continues to be more prevalent, and as competition compels companies to provide expanded variety, at ever lower cost, so introducing plant and processes technological constraints. Model flexibility can also benefit from an appropriate production planning process, especially concerning mixed-model assembly lines, since it can facilitate master scheduling and line balancing activities, which are essential aspects of flexibility. Robust and practical planning approaches have to take into account two different aspects: the first consists in ensuring that the elaborated aggregate plan can be disaggregated into at least one detailed feasible plan for the realised demand, whereas the second in ensuring that this detailed plan is feasible at the operational level. This article faces the model flexibility challenge, reviewing and discussing the planning problem of a real world assembly manufacturing system, producing high volume and a variety of agricultural tractors and machines, analysing and resolving some important issues related to technological, organisational and managerial constraints. This article illustrates the implementation of an Advanced Planning System integrated with a mixed integer-programming model, which is solved by a new iterative heuristic approach capable of achieving interesting planning improvements for model-flexibility management.     

Foreword: Special Issue on Retail Operations

This article draws on my field research in the retailing industry to identify the operational challenges faced by retailers and the relevance of those challenges to senior retail managers and researchers in operations management. It summarizes areas of research in retail operations that have evolved recently and are likely to be important in the future.     

浅析汇编语言中数制转换方法之查表法

数制转换是计算机中非常基础和重要的,用汇编语言程序进行数制转换速度快。但是需使用大量的指令语句。因此寻找一种可靠高效,指令精简的方法更为重要,本文正是介绍具有这些优良特性的查表法。     

大学英语教学中的词语搭配研究

词语搭配是英语中普遍存在的语言现象;在二语习得中,词语搭配对减少语言输入和输出中的误差累积、提高语言表达的准确性和流利程度具有重要意义。根据词语搭配的特点,笔者就大学英语教学中如何发挥词语搭配的作用提出建议。     

偶件的配合精度和装配方法设计

给出配合偶件的工作要求 ,据此设计偶件的配合精度和适用的装配方法 ,以及相应的零件加工精度     

基于约束权值算法的虚拟装配方法实现

在虚拟装配过程中,约束的施加在整个装配中起到非常关键的作用.文章提出了施加装配约束的约束权值算法,并说明了具体实现方法.通过在虚拟装配系统中对产品形象、直观的进行预装配,验证了该算法的有效性.     

提高投资估算精度 严把信贷项目评估质量关

提高投资估算精度 ,是确定项目评估质量的基础 ,从而也是影响信贷资产质量的重要因素。在实际工作中 ,可通过合理确定投资估算依据 ,选用科学的估算方法 ,详尽明确的估算内容 ,以及提高估算人员素质等方法 ,不断提高投资估算精度     

高精度紫铜薄板件的平面加工技术

本文针对高精度紫铜薄板件的平面加工因铣削加工易变形,难以保证精度要求的问题,从切削加工变形机理和切削受力分析出发,提出了用铣削作粗加工,磨削作精加工的工艺方法,在实际生产中,取得了良好的效果。