高校R&D与区域经济增长关系的实证研究

本文通过因子分析构造经济增长的复合指标,并利用2005—2006年我国31个省市高校R&D的相关数据进行回归分析和聚类分析。研究结果显示:高校R&D的专利授权对地区经济增长具有显著的促进作用,而研发的经费投入和人员投入对经济的推动作用不明显;高校的基础研究对地区经济发展至关重要;高校R&D的投入与产出不成正比,不同地区的高校R&D的经济效益差异较大,处于非均衡状态。因此,本文强调应在政策层面上重视基础研究,促进校企科研合作,提高研发经费的使用效率和研究人员的工作效率,加强区域协调,实现高校R&D与区域经济增长的和谐共进。     

论文化旅游是实现旅游可持续发展的有效途径

旅游业已成为国民经济的重要支柱之一,当前旅游业面临着环境污染、生态破坏等一系列问题,急需走上可持续发展的道路。开发和利用人文旅游资源,发展文化旅游是实现旅游可持续发展的有效途径。     

A genetic algorithm based heuristic for two machine no-wait flowshop scheduling problems with class setup times that minimizes maximum lateness

Machine scheduling problem has been extensively studied by researchers for many decades in view of its numerous applications on solving practical problems. Due to the complexity of this class of scheduling problems, various approximation solution approaches have been presented in the literature. In this paper, we present a genetic algorithm (GA) based heuristic approach to solve the problem of two machine no-wait flowshop scheduling problems that the setup time on the machines is class dependent, and the objective is to minimize the maximum lateness of the jobs processed. This class of machine scheduling problems has many practical applications in manufacturing industry, such as metal refinery operations, food processing industry and chemical products production processes, in which no interruption between subsequent processes is allowed and the products can be grouped into families. Extensive computation experiments have been conducted to evaluate the effectiveness of the proposed algorithm. Results show the proposed methodology is suitable to be adopted for the development of an efficient scheduling plan for this class of problems in real life application.     

路径依赖对公司数字创业的抑制及免疫机制研究

路径依赖是在位企业实现数字创业面临的必然挑战，而对企业如何有效利用内外部资源克服路径依赖，现有研究并未形成明确的观点。基于组织免疫理论，遵循抑制—免疫分析思路，从战略联盟和资源拼凑内外视角探究公司数字创业中克服路径依赖的免疫机制。实证结果表明，路径依赖对公司数字创业具有显著抑制作用；战略联盟与资源拼凑均能够对路径依赖的抑制作用产生免疫效应，但针对路径依赖的3个表现维度，战略联盟与资源拼凑发挥的免疫效应存在显著差异。     

铝硅镀层22 MnB5高强钢高温拉伸性能及本构模型

为了分析和表征热成形用的铝硅镀层22MnB5高强钢的热变形行为,采用Gleeble-3800热模拟试验机,在成形温度750～900℃、应变速率0.1～10 s-1试验条件下实施了铝硅镀层22MnB5高强钢的板材等温拉伸试验,采用双曲正弦型Arrhenius本构模型描述铝硅镀层22MnB5高强钢的高温流变行为,并考虑应变...     

Do ridesharing services cause traffic congestion?

This paper uses a difference-in-differences strategy and an event-study analysis to evaluate the effect of Uber entries on vehicle miles travelled in 346 US Metropolitan statistical areas between 2011 and 2017. Empirical results demonstrate that Uber entries have no significant effect on the total vehicle miles travelled in a city. However, Uber is found to decrease the vehicle miles travelled on highways but increase them on collector roads. All these effects come mainly from large metropolitan statistical areas. A simulation exercise suggests that Uber entries cause longer travel times if the share of travel time spent on collector roads is high.