排序方式： 共有37条查询结果，搜索用时 15 毫秒
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Hagmann M 《Science (New York, N.Y.)》1999,286(5443):1267-1268
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Hagmann M 《Science (New York, N.Y.)》1999,286(5449):2433-2434
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Hagmann M 《Science (New York, N.Y.)》1999,286(5439):388-389
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Hagmann M 《Science (New York, N.Y.)》2000,288(5474):2106-2107
A new report paints a darker picture of what may be the highest profile case of scientific fraud in postwar Germany. After a 2-year investigation of all 347 scientific articles co-authored by former hematologist and cancer researcher Friedhelm Herrmann, a task force jointly sponsored by Germany's main granting agency, the DFG, and the country's largest cancer charity released a report on 19 June indicating that the scope of the fraud--first uncovered 3 years ago--is far more extensive than previously thought. Although Herrmann and a co-author have left their academic posts, the new revelations could place other careers in jeopardy. 相似文献
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Hagmann M 《Science (New York, N.Y.)》2000,289(5479):572
CAMBRIDGE, U.K.--One of the few burgeoning areas of violence research here and in Europe is football hooliganism. With lower homicide rates than in the United States and fewer incidences of killing sprees such as the Littleton school shooting, Europeans are less concerned about violence than Americans are--and that translates into less money for research on the topic. Moreover, some scientists argue that strict regulation of animal studies has dealt a severe blow to a once-proud European tradition of behavioral research on animal aggression. 相似文献
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Hagmann M 《Science (New York, N.Y.)》2000,288(5468):945-946
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Jürgen Hagmann 《Land Degradation \u0026amp; Development》1996,7(2):145-160
Based on the results of an erosion damage assessment in Southern Zimbabwe, where mechanical conservation work has been carried out since the 1940s, this paper describes the impact of mechanical conservation systems on processes leading to rill erosion. In a study of a catchment area, it was found that influxes of water from roads and waterways as well as contour ridges that were originally designed to control rill erosion had a major role in the formation of rills. Existing rills and depressions which cause water concentration, siltation of contour drains and overflowing of contour ridges were the main factors leading to excessive rill erosion. The study showed that particularly during a highly erosive year like 1992/93, the damage due to rill erosion can be excessive, causing an abrupt degradation. It is concluded that the present conservation system is insufficient to control rill erosion effectively and is often the cause of this erosion. Effective control of rill erosion is a pre-condition for optimal implementation of land management systems such as conservation tillage. Therefore, an integrated approach to land husbandry must be developed jointly with farmers and promoted in order to improve crop production and sustainable management of natural resources. This should consider improved mechanical conservation as well as agronomic and biological soil and water conservation techniques. 相似文献
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