基于PLC的液压实验台监控系统的研制及开发

文章分析了液压系统的原理结构及特点,提出了基于PLC液压实验台监控系统的设计思路和实现方法。     

关于化学实验绿色化的研究与探索

本文从绿色实验思维养成、改进实验内容、采用微型化实验、引进先进仪器和技术、废弃物处理等几方面,论述了改进绿色化学实验的可行性和迫切性,符合环境可持续发展的时代要求。     

INDIVIDUAL AND ENVIRONMENTAL IMPACTS ON SUPPLY CHAIN INVENTORY MANAGEMENT: AN EXPERIMENTAL INVESTIGATION OF INFORMATION AVAILABILITY AND PROCEDURAL RATIONALITY

Some strategies for mitigating ordering inefficiencies in supply chains advise sharing information among decision‐makers. However, there has been little consideration of how individual perceptions intervene in the use of available information in decision‐making processes. This article reports the results of an experiment in which participants were instructed to minimize inventory holding and backlog costs for their supply chains as a whole. The analysis suggests that additional information affects supply chain inventory management costs only when rational decision‐making processes are followed. Decreased costs are observed when rational decision‐making is applied with backlog information. In contrast, increased costs are observed when consumer demand information is available.     

高水平实验示范中心建设的探索与思考

本文就如何建立高水平的实验教学示范中心进行了探讨。通过实验室开放、实验课程改革、大型仪器设备共享,引进人才、重视实验技术人员队伍建设,以及示范中心网络信息平台建立等措施,建立具有生动、创新的实验课程,良好的实验效果、高素质稳定的实验队伍、方便、准确的信息交互平台的优秀实验教学示范中心。     

Choice modelling with search and sort data from an interactive choice experiment

We present a highly structured, online, interactive choice environment containing a large number of alternatives, a search tool that eliminates alternatives that fail specified criteria, and a sort tool. A conceptual framework is developed that links tool usage and preference heterogeneity, and tested in the context of long-haul flight choice. Individuals who sort on price are more price sensitive; individuals who search on certain attributes have a greater marginal (dis)utility for that attribute; and individuals who perform certain non-price searches have a lesser price disutility. The method shows promise as a means for providing a richer picture of preference heterogeneity.     

Efficient local IV estimation of an empirical auction model

In this paper we examine semiparametric efficiency bounds and efficient estimators for the case of a linear local instrument variable (LIV) model under the assumptions studied in Abadie et al. (2002). We apply the semiparametrically efficient estimation method to analyze the relation between bid dispersion and early bidding in an online auction dataset, which is collected from a natural experiment conducted in Nekipelov (2007). The results confirm the theoretical findings developed in Nekipelov (2007). The semiparametric efficient estimation procedure substantially improves the statistical significance of the effect of jump bidding on bid dispersion.     

Effect of Secondary School Fees on Educational Attainment*

In this study, the heterogeneity of the fee abolition process in West German secondary schools is used to identify the effect of school fees on educational attainment and to obtain an estimate of the price elasticity of upper secondary education. The analysis is based on representative individual‐level data from three annual surveys of the German Mikrozensus. While coefficients cannot be estimated precisely, the results suggest that, on average, upper secondary school attainment increased by at least 8 percent in response to the fee abolition. The educational attainment of females appears to be more price sensitive than that of males.     

AutoCAD教学方法研究

本文针对AutoCAD教学中存在的一些问题,提出了能够调动学生积极性的教学方法。鼓励学生在实际应用中学习。实践证明,新的教学方法能够提供教学效果。     

Impacts of Asynchronous Learning Networks on Individual and Group Problem Solving: A Field Experiment

An Asynchronous Learning Network (ALN) is a Computer-Mediated Communication System designed to support "anytime/anywhere" interaction among students and between students and instructors. A field experiment compared groups and individuals solving an ethical case scenario, with and without an ALN, to determine the separate and joint effects of communication medium and teamwork. Dependent variables include quality and length of the reports, and subjective perceptions of learning and satisfaction. The results indicate that that an ALN enhances the quantity and quality of the solutions to an ethical case scenario. The combination of teamwork with ALN-support increases the students' perception of learning. Although the perception of collaborative learning was similar between ALN-supported and unsupported groups, participants in computer-mediated groups reported lower perceptions of discussion quality than participants in manual groups.     

The effect of relative performance feedback on individual performance in team settings under group-based incentives*

This study reports the results of an experiment that analyses the behavioural effect of relative performance feedback (RPF) on individual performance when compensation is based on team performance. Specifically, it investigates whether RPF affects individual performance differently when the comparison focuses on other members of that individual’s team (within-group RPF) or on other teams (between-group RPF). We predict a negative effect of within-group RPF on individual performance. We also predict that between-group RPF moderates that negative effect, since it encourages individuals to focus on group goals rather than individual goals. Consistent with our predictions, results show that the negative effect of within-group RPF on individual performance is mitigated by between-group RPF. Our results can help accountants to better understand how the effects of relative performance feedback differ according to the predominant comparison target.