数码印刷 极具竞争力

与任何新兴技术一样,数码印刷虽然出现得较晚,但正在备方面取得持续,迅猛的发展,特别是在速度,输出幅面和可靠性方面有了很大提高。 喷墨技术的发展体现在速度上．可与计算机的处理速度和数码相机的突飞猛进相媲美。喷墨印刷设备将随着速度的改变而快速地发展。主要打印头供应商正在提高制造精度以及产量,并且降低销售价格。同时,正在关注可变喷墨头、更小墨滴的喷墨能力,以及喷墨速度的改善。     

Factors affecting student career choice in science: An Australian study of rural and urban schools

In 1990/91, a research study was undertaken in England on the Factors Affecting Schools’ Success in Producing Engineers and Scientists (FASSIPES). This study was conducted by Brian Woolnough at the Oxford University Department of Educational Studies, in conjunction with the Institute of Physics and the Institution of Electrical Engineers and National Power (Woolnough, 1991, 1994; Woolnough et al., 1997). Principally, Woolnough attempted to ascertain why young people chose to pursue a career in the physical sciences and engineering. In addition, characteristics of schools which appeared to influence students to pursue a study of science were investigated. A number of countries have since replicated this study as an international research cooperative and the National Key Centre for School Science and Mathematics, Curtin University of Technology, Perth, Western Australia participated on behalf of Australia. Currently, the following countries have contributed to FASSIPES International in addition to England and Australia: Canada, China, Japan and Portugal.     

Social structures and the flow of scientific information in public agencies: an ideal design

Despite widespread dissatisfaction with the quality of scientific information employed in planning and policy-making in public agencies, relatively little is known about the scientific information acquisition behaviors of public managers. The purpose of this paper is to facilitate research on scientific information acquisition in public agencies by suggesting that: (1) planning and policy-making are ‘policy technologies’ and share certain attributes with more traditional technologies; (2) many propositions developed in the literature on information flows in R&D labs are, therefore, helpful in structuring thinking about information flows in public agencies; and (3) it may be possible self-consciously to design social and organizational structures so as to enhance informal flows of scientific information. After gleaning some of the propositions concerning scientific information flows from the R&D management literature, an ‘ideal design’ approach is employed to develop a model in which the social and organizational structures of a public agency optimize scientific information flow.     

A time allocation study of university faculty

Many previous time allocation studies treat work as a single activity and examine trade-offs between work and other activities. This paper investigates the at-work allocation of time among teaching, research, grant writing and service by science and engineering faculty at top US research universities. We focus on the relationship between tenure (and promotion) and time allocation, and we find that tenure and promotion do affect the allocation of time. The specific trade-offs are related to particular career paths. For example, full professors spend increasing time on service at the expense of teaching and research while longer-term associate professors who have not been promoted to full professor spend significantly more time teaching at the expense of research time. Finally, our results suggest that women, on average, allocate more hours to university service and less time to research than do men.     

Adaptation of the Questionnaire on Teacher Interaction for Elementary Grades

The secondary school version of the Questionnaire on Teacher Interaction (QTI) was adapted for the elementary school level and administered to 1 512 Singaporean students in 39 mathematics classes. The QTI is based on a two-dimensional model of influence (dominance-submission) and proximity (cooperation-opposition). Data supported each scale's internal consistency reliability, ability to predict student achievement, and ability to differentiate between the perceptions of students in different classrooms.     

Parent and student perceptions of classroom learning environment and its association with student outcomes

This research is distinctive in that parents’ perceptions were utilised in conjunction with students’ perceptions in investigating science classroom learning environments among Grade 4 and 5 students in South Florida. The What Is Happening In this Class? (WIHIC) questionnaire was modified for young students and their parents and administered to 520 students and 120 parents. Data analyses supported the WIHIC’s factorial validity, internal consistency reliability and ability to differentiate between the perceptions of students in different classrooms. Both students and parents preferred a more positive classroom environment than the one perceived to be actually present, but effect sizes for actual-preferred differences were larger for parents than for students. Associations were found between some learning environment dimensions (especially task orientation) and student outcomes (especially attitudes). Qualitative methods suggested that students and parents were generally satisfied with the classroom environment, but that students would prefer more investigation while parents would prefer more teacher support. The study provides a pioneering look at how parents and students perceive the science learning environment and opens the way for further learning environment studies involving both parents and students.