北京市居住区屋面集雨资源的潜力分析

随着中国快速城市化,传统的供水方式正面临严峻挑战,雨水利用这一古老的水资源利用技术,被实践证明是解决城市水问题的重要手段之一。与城市其他不透水面集雨利用相比较,屋面收集的雨水水质高,因此屋面集雨利用系统在世界上被广泛应用。本文建立了居住区屋面集雨利用潜力的计算方法,并据此计算出北京2002年～2007年居住区屋面依据实际年降水量和多年平均降水量可收集的水量分别为2.16亿m3和2.75亿m3,雨水利用对家庭生活用水的节水效率分别为7.2%和9.3%。通过分析影响北京雨水利用的因素,预测了2020年北京居住区屋面可收集水量与不同情景下的收集利用量。最后针对北京雨水利用存在的问题提出了相应的政策措施。     

The future of HRD

What organizational, technological and training developments will become crucial in the coming years, and what consequences will they have for human resource development? These questions have led to a study carried out by the faculty of Educational Science and Technology at the University of Twente, in the Netherlands. The ultimate aim of the study was to create an inventory of trends and developments which professionals deem to be influential with regard to the future HRD field. One direct catalyst for the study was the report of a similar study in the United States, involving HRD executives, carried out by the American Society for Training & Development. Following a brief explanation of the research plan and methods, this article describes the findings of the Dutch study an compares these with the results of the American research. It concludes with comments regarding the implications of the information obtained through this investigation.     

Perception,imagery, visualization and engineering graphics

We have conducted action research involving an instructional intervention over a 20-year period. This has demonstrated that spatial ability influences academic performance in engineering, and can be increased through instruction focused on using perception and mental imagery in three-dimensional representation. Prior to our intervention, the first-year engineering graphics course at our university had a failure rate of 36% for all engineering students and failure rates of 80% for African students studying at our university. Similar high failure rates were reported in engineering drawing and design courses at other Southern African universities, and similar association between low scores on tests of spatial ability and academic performance, suggesting that the problem was one encountered by many engineering students, not just by students at our university. Over the initial 2 years of the intervention, pass rates for the first-year engineering graphics course increased from 64 to 76%. With further changes in teaching, and the training of senior students as tutors to support the lecturing and practical activities provided in the course, the pass rates have risen to 88% annually, over a period in which the composition of the first-year student has become increasingly diverse, with greater numbers of students entering the university from disadvantaged educational backgrounds. The instructional model we have used is based on Piagetian principles, and confirms Piaget's theories with respect to the trainability of spatial ability in adulthood. Our findings suggest the importance of early identification of students with difficulty, as well as the potential value of an intervention aimed at training the processes involved in visualization through three-dimensional modelling and representation of objects. While spatial ability appears to be trainable through the methods we have developed, our research also indicates that level of spatial ability at time of intake to university is an important influence on academic performance, suggesting the value of instruction in visualization and three-dimensional representation at school level. Social factors are also important influences on academic performance, suggesting the value of tutorial-based interventions aimed at improving spatial ability in those university and technikon courses for which visualization and three-dimensional representation are a requirement.     

Constructivist,Problem-Based Learning Does Work: A Meta-Analysis of Curricular Comparisons Involving a Single Medical School

Effects of problem-based learning as reported in curricular comparison studies have been shown to be inconsistent over different medical schools. Therefore, we decided to summarize effects of a single well-established problem-based curriculum rather than to add up sometimes-conflicting findings from different problem-based curricula. Effect sizes were computed for 270 comparisons. The results suggest that students and graduates from the particular curriculum perform much better in the area of interpersonal skills, and with regard to practical medical skills. In addition, they consistently rate the quality of the curriculum as higher. Moreover, fewer students drop out, and those surviving need less time to graduate. Differences with respect to medical knowledge and diagnostic reasoning were on average positive but small. These outcomes are at variance with expectations voiced in recent contributions to the literature. They demonstrate that constructivist curricula can have positive effects on learning even if they deemphasize direct instruction.     

Quality Assurance in an Academic Unit: A Case Study

Total quality management (TQM) is a philosophy that is now accepted worldwide in the business environment. However, in higher education, quality management is not widespread. Quality efforts are mainly limited to specific tasks, such as course development, curriculum design, laboratory certification, etc. The Division of Industrial Management at K. U. Leuven decided in 1990 to develop and implement a total quality approach in its organization. This process recently resulted in a total quality system based upon the implementation of a quality handbook. This paper describes this unique experience of TQM in an academic unit.     

The Introduction of Portfolios in Higher Education: a comparative study in the UK and the Netherlands

This article describes a comparative study of the introduction of student portfolios in two departments of the Vrije Universiteit Amsterdam in the Netherlands and Nottingham Trent University in the UK. Portfolios are designed to facilitate effective management of lifelong learning, to provide a record of achievements and to encourage self-reflection by students.
The justifications for the portfolio initiative are different in the two countries. At the Vrije Universiteit, the initiative arose within the University but is being implemented by individual faculties. There is no standard model of implementation. At Nottingham Trent University, portfolios are being introduced as a response to a government directive, as part of a lifelong learning portfolio that each individual will carry forward into their working life. The University's response to this imperative is top-down and a University-wide model is being sought. The department model is one of several models that are being evaluated for this purpose.
This research project investigates whether these alternative starting points lead to differential responses from student users or not. Data are drawn from quantitative (questionnaires) and qualitative (interviews with managers, consultants and teachers) sources. Similarities and differences in students' responses to the portfolio exercise are identified and discussed in terms of factors such as the way the portfolios are introduced, the incentives offered to complete them, the role of the lecturer and peers in the monitoring of study progress, the quality of self-regulative skills, and students' learning expectations.     

Engineering,Ethics and Professionalism

This paper addresses the changing role of engineers in industry and society with specific reference to the increasing environmental pressures on industry. Sustainable development, as discussed widely since the Brundtland Report in 1987, provides a broad framework for environmental activities in industry. The intended move—worldwide—towards sustainable development involves engineering in the key role of designing and managing ‘Clean Technology’, i.e. of technological systems which are less harmful, more efficient and socially as well as environmentally acceptable. The paper examines the extent to which professional engineers can work and achieve sustainable development within their professional roles and considers their roles and responsibilities involved in such a move. Special emphasis is given to the role of creativity, ethics and the demand for professionalism in the changing roles of engineers. The examination of the ethical and professional issues identified is used together with the observed changes in industrial systems and engineering roles to determine new educational needs of those engineers driving future developments in industry.