Concerning the Herschel effect     

Fred G. Person  Julian M. Blair 《Journal of The Franklin Institute》1938,225(1):73-80

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The semantic mapping of words and co-words in contexts     

Loet Leydesdorff  Kasper Welbers 《Journal of Informetrics》2011,5(3):469-475

Meaning can be generated when information is related at a systemic level. Such a system can be an observer, but also a discourse, for example, operationalized as a set of documents. The measurement of semantics as similarity in patterns (correlations) and latent variables (factor analysis) has been enhanced by computer techniques and the use of statistics; for example, in “latent semantic analysis”. This communication provides an introduction, an example, pointers to relevant software, and summarizes the choices that can be made by the analyst. Visualization (“semantic mapping”) is thus made more accessible.  相似文献   

Public discourse on HIV and AIDS: an archival analysis of national newspaper reporting in Uganda, 1996–2011     

Elizabeth Lagone  Sanyukta Mathur  Neema Nakyanjo  Fred Nalugoda  John Santelli 《Sex education》2014,14(5):556-567

Uganda is recognised as an early success story in the HIV epidemic at least in part due to an open and vigorous national dialogue about HIV prevention. This study examined the national discourse about HIV, AIDS, and young people in New Vision, Uganda's leading national newspaper between 1996 and 2011, building from a previous archival analysis of New Vision reporting by Kirby (1986–1995). We examined the continuing evolution in the public discourse in Uganda, focusing on reporting about young people. An increase in reporting on HIV and AIDS occurred after 2003, as antiretroviral treatment was becoming available. While the emphasis in newspaper reporting about adults and the population at large evolved to reflect the development of new HIV treatment and prevention methods, the majority of the articles focused on young people did not change. Articles about young people continued to emphasise HIV acquisition due to early and premarital sexual activity and the need for social support services for children affected by HIV and AIDS. Articles often did not report on the complex social conditions that shape HIV-related risk among young people, or address young people who are sexually active, married, and/or HIV-infected. With HIV prevalence now increasing among young people and adults in Uganda, greater attention to HIV prevention is needed.  相似文献   

Long-term instructional development: A 20-year ID and implementation project     

Howard Sullivan  Kay Ice  Fred Niedermeyer 《Educational technology research and development : ETR & D》2000,48(4):87-99

This article describes the development and implementation in the schools over a 20-year period of the Energy Source Program, a comprehensive K-12 energy education curriculum. The program was developed beginning in 1980 using state-of-the-art development procedures for that time and has been used to date by more than 12 million American students to learn about energy and energy issues. End-of-unit posttest scores for the elementary and high school units averaged above 80% for their field tests. Data obtained from a large sample during the first three years of installation of the program in the schools indicated that posttest scores remained at a level during installation similar to that during the field-test phase. A study conducted in the early 1990s by an independent research organization to assess the program's long-term effects revealed that grade 6 students who had used one or more units from the program had significantly greater energy knowledge and better energy conservation habits than students who had not used any units. A set of 10 guidelines are offered for long-term instructional development and implementation projects. He supervised the development of the Energy Source Program from 1980 to 1984 while serving as a consultant to EDS. Kay Ice was Director of Program Development at EDS, and she was a primary writer and developer of the Energy Source Program. She has been president of EDS since 1999. Fred Niedermeyer was the founding president of EDS. He was project director of the Energy Source project, and he played a major role in all aspects of the project from its inception until his retirement in 1999.  相似文献   

Building electronic cooperation in the 1990s- the Maryland, Georgia, and Texas experiences     

Desider L. Vikor  George Gaumond  Fred M. Heath 《The Journal of Academic Librarianship》1997,23(6):511-514

Large scale statewide library cooperation using information technology and wide area networks dates back to the early 1980s with efforts such as the Florida Center for Library Automation and, more recently, the LOUIS Project in Louisiana (see JAL January 1994) and OhioLink (see JAL September 1995). Early efforts were usually focused on the implementation of library information management systems and the provision of shared access to locally held collections, and they often still are. In the 1990s, though, we are witnessing a shift in statewide cooperative use of networks to provide principally access to bibliographic and full-text resources not held locally and usually provided by commercial vendors for use by libraries. As the case studies in this column illustrate the development of funding sources, the technical implementations and support, and the management organization differ from state to state. They reflect, though, the incremental shift in the information landscape towards “electronic libraries”. I choose the word incremental intentionally to reflect that this change has not (at least so far) been anywhere near as rapid or revolutionary as many expected. Nevertheless, what has happened in about 15 years is quite dramatic. It portends a different kind of academic library.—CBL, University of Maryland, College Park.  相似文献   

Old Mr de la Mare     

Fred Sedgwick 《English in Education》1990,24(3):35-35

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Peter Weidhaas,A History of the Frankfurt Book Fair     

Fred Kobrak 《Publishing Research Quarterly》2008,24(3):229-232

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The power law model and total career h-index sequences     

Fred Y. Ye  Ronald Rousseau   《Journal of Informetrics》2008,2(4):288-297

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Cognitive Illusions as Hindrances to Learning Complex Environmental Issues     

Groves  Fred H.  Pugh  Ava F. 《Journal of Science Education and Technology》2002,11(4):381-390

Journal of Science Education and Technology - Teaching and learning complex issues is often confounded by the presence of simplistic mental models that are held by students. These simplistic models...  相似文献   

Evidence for a calorically costly negative consummatory contrast effect in rats     

Fred P. Valle 《Learning & behavior》1990,18(4):387-392

For 2 h prior to their daily meal of Purina Chow, rats (which were 14% below ad-lib weight levels) had access to a sucrose solution. For half (Group 16-4), the solution was alternated daily between 18% and 4%; for the other half (Group 4-4), the solution was always 4%. On 18% days, Group 16-4 consumed significantly more calories and gained significantly more weight than did Group 4-4, because of a greater consumption of sucrose calories (Purina intake was similar for the two groups). On 4% days, however, Group 16-4 consumed both significantly fewer sucrose calories and significantly fewer Purina calories than did Group 4-4. These two contrast effects resulted in a 17% shortfall in total caloric intake for Group 16-4 on 4% days. As a consequence, Group 16-4 showed a significant drop in body weight, compared to Group 4-4, on 4% days. A second experiment was carried out to investigate whether the contrast-induced reduction in Purina intake shown by Group 16-4 on 4% days would be eliminated if (1) a 30-min interval separated sucrose ingestion from Purina ingestion, or (2) a 25-min interval plus 5-mmn exposure to 16% sucrose separated ingestion of 4% sucrose from Purina ingestion. Purina intake was still suppressed in Group 16-4 under both conditions.  相似文献