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.     

数学认知结构发展途径及在教学中的应用

数学认知结构的三种发展途径有数学沿袭、数学实验和数学实践,在数学教学中应正确利用这三种途径帮助学生构建良好的数学认知结构.     

VAM FJL无接箍式套管的使用性能分析

通过全尺寸试验的方法,对VAM FJL无接箍式套管的上扣性能、气密封性能、抗内压性能、抗拉伸与压缩性能以及抗弯曲性能等指标进行了考核和分析,重点研究了这种套管在过扭矩上扣和压缩条件下接头的应变分布,指出了这种套管的使用特点和在结构上存在的不足,为油田正确选用VAM FJL套管提供了资料和依据。     

The Influence of Product/Nudity Congruence on Advertising Effectiveness

Abstract

While a body of research has examined the effects of nudity appeals in advertising, previous studies examining the question of product/nudity congruency have failed to consider product categories of equivalent levels of involvement and towards which respondents had similar purchase intention. In this experimental study, we examine the role which product/nudity congruency and levels of nudity have on several measures of advertising effectiveness. We also examine the effect of the usa between these two variables. Our findings suggest that product type and the interaction between degree of nudity and product both influence significantly certain measures of advertising effectiveness. Implications for marketing professionals and researchers are outlined, along with directions for future research.     

Encouraging employees to co-operate: the effects of sponsored training and promotion practices on employees' willingness to work overtime

The ‘mutual-investment’ model argues that when employers invest more in the social exchange relationship between them and their employees, their employees will show more effort. In this paper we relate the ‘mutual-investment’ model to training and promotion (possibilities) and examine if these kinds of career-enhancing measures influence the willingness of employees within organizations to work overtime. To test this hypothesis, a vignette experiment was conducted in five organizations (N = 388; 1,531 vignettes). Multilevel analyses show that employees are more willing to work overtime when their employer has provided for training, when the employee recently was promoted, when the supervisor was supportive in the past and when co-workers approve of working overtime and behave similarly. But we did not find that future promotion chances affect willingness to work overtime.     

The Impact of School Lunches on Primary School Enrollment: Evidence from India's Midday Meal Scheme

At the end of 2001, the Indian Supreme Court issued a directive ordering states to institute school lunches – known locally as “midday meals” – in government primary schools. In this paper we provide a large‐scale assessment of the enrollment effects of India's midday meal scheme, which offers warm lunches, free of cost, to 120 million primary school children across India, and is the largest school feeding program in the world. To isolate the causal effect of the policy, we make use of its staggered implementation across Indian states in government but not private schools. Using a panel dataset of more than 420,000 schools observed annually from 2002 to 2004, we find that midday meals result in substantial increases in primary school enrollment, driven by early primary school responses to the program. Our results are robust to a wide range of specification tests.     

Utilizing environmental information and pricing strategies to reduce externalities of tourism: the case of invasive species in the Galapagos

The increase in demand for nature-based tourism brings economic and educational benefits but risks the introduction of invasive species. Increasing the length of tourist trips can better balance these benefits and risks by maintaining revenues while reducing the number of unique contacts with tourists. Changing the relative prices of trips can induce tourists to take longer trips. We hypothesized that providing information about the negative externalities of tourism could improve the effectiveness of such pricing strategies.

We administered one of two discrete choice surveys to tourists considering a trip to the Galapagos. One of the surveys described the Galapagos as a fragile ecosystem susceptible to invasive species; the second described it as a standard nature-based destination. For each sample, we estimated the probability of the tourist choosing a short versus long trip, given the tourist's personal information and trip options presented to him. We then simulated the demand for trips using three pricing strategies. We found that providing information on invasive species significantly increased the efficacy of strategic pricing. We propose using a two-prong approach to tourism management: educate potential tourists about the islands’ vulnerabilities, and simultaneously increase the per-day cost of short trips relative to that of longer trips.     

悬索桥空缆状态数值分析

本文主要介绍悬索桥空缆状态数值分析方法。主要包括:基于无应力状态分析法和悬链线理论求解悬索桥空缆线形的数值迭代方法;等高、不等高悬链线求解方法及利用matlab编制相应程序实现空缆线形数据的求解。