部分水解聚丙烯酰胺溶解速度的测定方法及影响因素

本文研究讨论了电导率法、粘度法、背景试剂法等部分水解聚丙烯酰胺溶解速度的几种测定方法,讨论了粒度、相对分子质量和水解度的大小对聚丙烯酰胺在水中溶解速度的影响,为聚丙烯酰胺溶解速度的测定提供了理论依据.     

Integration Deficits of IT Controlling

The paper is based on the thesis that IT controlling suffers from two integration deficits with regard to its methods base: On the one hand, this is a lack of synchronization between research on IT controlling methods and developments in practice; on the other hand, a lack of integration of IT controlling methods with methods of business and information systems engineering (BISE). Based on this assumption, the paper investigates historical developments in IT controlling research and practice to derive theses about the present state of method integration. The analysis finds indications for further potential for method integration and identifies these potentials. Requirements towards method integration are derived from an analysis of the identified integration potentials and two examples illustrate how to realize further integration. Accepted after two revisions by the editors of the special focus. This article is also available in German in print and via http://www.wirtschaftsinformatik.de: Strecker S, Kargl H (2009) Integrationsdefizite des IT-Controllings – Historischer Hintergrund, Analyse von Integrationspotenzialen und Methodenintegration. doi: 10.1007/s11576-009-0175-9.     

基于SSM的福建省区域制造业结构比较研究

利用偏离-份额分析法分析了福建省9个设区市制造业的结构和地域分工特征,研究发现福建省东部地区制造业竞争力比西部地区强、知识密集型产业比重高,同时发现福州市制造业地位正在下降,最后结合实际针对福建省制造业结构和地域分工的特征提出优化整合对策,以优化配置制造业资源,提高福建省区域制造业竞争力。     

教师如何有效实施螺旋式项目教学法

在计算机专业的一些实践性很强的技能型课程中,采用新的螺旋式项目教学法,根据课程应用性的特点,以及职业能力的需求,在宏观的课程上的拓展,微观课堂上递进驱动教学法将理论教学与实践教学有机结合,实践教学效果很明显。但是新的教学方法对教师的工作任务有了新得标准,如何处理知识点的衔接,实现螺旋式上升势态,教学过程中如何把握知识点的内在联系,加强知识的层次性,最终实现知识点层层梯进,逐步深入。     

中国区域知识复杂性测度及其对创新的影响

十九大报告明确提出，创新是引领发展的第一动力，是建设现代化经济体系的战略支撑。知识作为创新的核心驱动力，其重要性受到众多学者的关注。基于伊达尔戈等的HH反射方法，利用15 988 864件中国专利数据，测度中国内地31个省市区知识复杂程度，并检验其对创新产出的影响。结果发现：①虽然东部地区的稀缺技术掌握能力高于中、西部，但中、西部地区落后境况不断改善，正逐渐进入新的技术领域；②知识复杂性对创新高效区域（东部）的影响更大，但低效地区（中、西部）具有更高的稀缺知识边际增益。以上发现的政策含义是，区域不应仅谋求单一领域内的竞争优势,应以兼顾聚集多样化和高质量知识为最终政策目标。     

Toward a more practical approach to evaluating programs: The Multi‐Objective Realization approach

Emerging trends indicate that programs are being used to deliver benefits that may not be fully harnessed from single sets of uncoordinated projects. To support this movement, it is essential to have suitable measurement frameworks to assess the contribution of these activities and supply decision makers with valuable data on whether their objectives are being realized. This paper introduces the Multi‐Objective Realization Method (MORE) to help measure the strategic contributions of programs. The main principles of MORE underline the importance of a formal strategy to elicit and develop program objectives and to frame those objectives within defined measurement dimensions.     

Labour adjustment costs: Estimation of a dynamic discrete choice model using panel data for Greek manufacturing firms

In this paper we estimate a dynamic structural model of employment at firm level. Our dataset consists of a balanced panel of 2790 Greek manufacturing firms. The empirical evidence of this dataset stresses three important stylized facts: (a) there are periods in which firms decide not to change their labour input, (b) there are periods of large employment changes (lumpy nature of labour adjustment) and (c) the commonality is employment spikes to be followed by smooth and low employment growth periods. Following Cooper and Haltiwanger [Cooper, R.W. and Haltiwanger, J. “On the Nature of Capital Adjustment Costs”, Review of Economic Studies, 2006; 73(3); 611–633], we consider a dynamic discrete choice model of a general specification of adjustment costs including convex, non-convex and “disruption of production” components. We use a method of simulated moments procedure to estimate the structural parameters. Our results indicate considerable fixed costs in the Greek employment adjustment.     

区域一体化与城市创新：基于长三角扩容的准自然实验

随着我国城市进入都市圈发展的新时代，区域一体化对城市创新产生了广泛而深刻的影响。从创新资源流动整合、知识技术溢出和市场规模扩大等维度深入分析区域一体化对城市创新的潜在作用机制，将长三角扩容作为一项准自然实验，以2003-2018年中国内地283个地级市为样本数据，综合利用合成控制法和PSM-DID模型对两者关系进行实证检验。结果发现：①整体而言，长三角扩容能够显著促进城市创新水平提升。从不同区域看，长三角扩容对原位和新进城市创新水平均有显著促进作用，且对新进城市的影响大于原位城市；②异质性分析结果表明，扩容政策对科创走廊城市创新水平的提升作用强于非科创走廊城市，同时区域通达性改善也能够明显强化扩容对城市创新的政策效应；③扩容政策对城市创新的作用呈现出边际效应递减趋势。研究结论对推进长三角一体化发展、深化区域创新合作、建设长三角创新驱动示范带具有重要指导意义。     

一种新的超市门店需求预测方法与库存管理模型

探讨了VMI模式下如何确定连锁超市门店的订货点的问题。利用专家判定法改进了基于历史数据的零售商需求预测模型，并在此需求预测模型基础上提出一种具有时间和数量柔性的自动补货策略模型。最后通过实倒分析表明，研究结果有助于帮助企业在快速响应市场需求的同时。降低企业的成本，提高企业的竞争力。此模型将在某连锁百货的订货系统中得到应用。     

快速全站仪三角高程测量方法及应用

传统三角高程测量由于受仪器高和棱镜高量取误差的影响，精度较低。文章介绍了两种较传统三角高程测量更为简易且高精度的方法，分别是中间法和设定参数法。这两种方法无需量取仪器高和棱镜高，减少了三角高程测量的误差来源，提高了观测的精度。