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David Roberts 《Distance Education》1984,5(1):50-71
This paper begins by defining the term ‘student drop‐out’. Data are presented showing that the time that an external student is at greatest risk of becoming a drop‐out is during the first term, semester or year of study.
The reasons for this phenomenon are explored in the light of the theories of three writers in the field of distance education, namely, Otto Peters, Börje Holmberg and David Sewart.
The paper concludes by listing a number of suggestions that might be adopted in order to reduce early attrition rates and generally improve the functioning of distance education institutions. 相似文献
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This second part of a two-part paper describes how the University of California, San Francisco (UCSF) Library implemented a bibliographic control system for a medical illustrations collection. Discussed are the staffing of the project, the design of formats and computer programs, further design changes, the input process, quality evaluation of the illustrations, and production and distribution of the control products (printed indexes and microfiche replicas). The report ends with a note on the applicability of the UCSF system to other libraries, and some benefits of the project. 相似文献
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Salmanzadeh A Kittur H Sano MB C Roberts P Schmelz EM Davalos RV 《Biomicrofluidics》2012,6(2):24104-2410413
Ovarian cancer is the leading cause of death from gynecological malignancies in women. The primary challenge is the detection of the cancer at an early stage, since this drastically increases the survival rate. In this study we investigated the dielectrophoretic responses of progressive stages of mouse ovarian surface epithelial (MOSE) cells, as well as mouse fibroblast and macrophage cell lines, utilizing contactless dielectrophoresis (cDEP). cDEP is a relatively new cell manipulation technique that has addressed some of the challenges of conventional dielectrophoretic methods. To evaluate our microfluidic device performance, we computationally studied the effects of altering various geometrical parameters, such as the size and arrangement of insulating structures, on dielectrophoretic and drag forces. We found that the trapping voltage of MOSE cells increases as the cells progress from a non-tumorigenic, benign cell to a tumorigenic, malignant phenotype. Additionally, all MOSE cells display unique behavior compared to fibroblasts and macrophages, representing normal and inflammatory cells found in the peritoneal fluid. Based on these findings, we predict that cDEP can be utilized for isolation of ovarian cancer cells from peritoneal fluid as an early cancer detection tool. 相似文献
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This exploration of the role of information in helping people to develop and sustain feelings of belonging, or a sense of place, is based on a study that investigated the reasons for the high population turnover in the Northern Territory of Australia. The Northern Territory along with Darwin, its capital, has a number of unusual characteristics including geographical isolation. A key component of the theoretical framework for the research focuses on social information, which has similarities to the more commonly termed everyday life information. The specific concern is with the kind of information that helps people connect to a community and is clearly linked with social networking. The sample for the major empirical component for the article was recruited at Darwin's Mindil Beach Market. In telephone phone interviews with those who had agreed to participate, participants discussed how they learned about Darwin and the Northern Territory, and their views of Darwin as a place to live. Interpersonal contacts, including at the Market and at special events, were most often mentioned in relation to information, confirming literature findings on the importance of family and friends as an information source. Other sources were newspapers and physical markers around the City of Darwin. The conclusion is that the processes of social networking, which work well for some residents, could be enhanced through the use of information grounds, a concept widely discussed in the library and information science literature. Obvious information grounds in Darwin, where the usual processes could be enhanced by the distribution of information by formal information providers, include Mindil Beach Market and the special events for which Darwin is renowned. 相似文献
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Pamela Roberts 《Teaching in Higher Education》2013,18(5):542-555
This research is based on an empirical study exploring how academics make curriculum decisions and their perceptions of the influences that shape their decisions. Interviews were held with 20 academics from diverse disciplines, who were both research active and committed to teaching. The higher education curriculum was conceptualised as a field of decision-making shaped by academics’ beliefs about educational and contextual influences. The study identified five distinctive curriculum orientations representing coherent patterns of curriculum decisions aligned with academics’ beliefs about educational purposes. Case studies are presented to elucidate each of the curriculum orientations. Curriculum orientations were also found to shape academics’ responses to educational change. The following higher education change drivers are explored: graduate employability and the skills agenda, teaching–research relationships, changing understandings about teaching and learning, educational technologies and flexible delivery. The findings suggest implications for institutional curriculum change initiatives and academic development programmes. 相似文献