共查询到20条相似文献,搜索用时 15 毫秒
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Bisby FA 《Science (New York, N.Y.)》2000,289(5488):2309-2312
The massive development of biodiversity-related information systems on the Internet has created much that appears exciting but chaotic, a diversity to match biodiversity itself. This richness and the arrays of new sources are counterbalanced by the maddening difficulty in knowing what is where, or of comparing like with like. But quietly, behind the first waves of exuberance, biologists and computer scientists have started to pull together in a rising tide of coherence and organization. The fledgling field of biodiversity informatics looks set to deliver major advances that could turn the Internet into a giant global biodiversity information system. 相似文献
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Christina H. Gladwin 《Agriculture and Human Values》1989,6(3):32-41
Increasingly, it is accepted wisdom for agricultural scientists to get feedback from indigenous peoples—peasants—about new improved seeds and biotechnologies before their official release from the experiment station. What is not yet accepted wisdom is the importance of cognitive science to research on farmer decision making, especially of the type Why don't they adopt. In this paper, the impact of the cognitive revolution on models of farmer decision making is described, and decision making models before and after the cognitive revolution are contrasted. An example of a decision model after the cognitive revolution is given by the Malawi farmer's decision whether to use chemical fertilizers or organic fertilizers or both. Results of testing the model show that in Malawi, smallholders' lack of capital and credit are more important factors constraining use of chemical fertilizers than are indigenous beliefs in organic fertilizers or fears of a future dependency on chemicals.Christina H. Gladwin is Associate Professor in the Food and Resource Economics Department at the University of Florida, Gainesville. Her research interests include the cognitive relationship between norms, plans, and decision processes and large-scale shifts in norms and choice. The research for this paper was initiated while she was a Rockefeller post-doc assigned to the International Fertilizer Development Center. 相似文献
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Gillispie CC 《Science (New York, N.Y.)》1985,229(4718):1077-1078
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Kolata GB 《Science (New York, N.Y.)》1977,197(4305):747-748
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《Science (New York, N.Y.)》2000,289(5488):web supplement
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Climate change is predicted to become a major threat to biodiversity in the 21st century, but accurate predictions and effective solutions have proved difficult to formulate. Alarming predictions have come from a rather narrow methodological base, but a new, integrated science of climate-change biodiversity assessment is emerging, based on multiple sources and approaches. Drawing on evidence from paleoecological observations, recent phenological and microevolutionary responses, experiments, and computational models, we review the insights that different approaches bring to anticipating and managing the biodiversity consequences of climate change, including the extent of species' natural resilience. We introduce a framework that uses information from different sources to identify vulnerability and to support the design of conservation responses. Although much of the information reviewed is on species, our framework and conclusions are also applicable to ecosystems, habitats, ecological communities, and genetic diversity, whether terrestrial, marine, or fresh water. 相似文献
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Hammond AL 《Science (New York, N.Y.)》1975,189(4205):779-781
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以一台渔船用海水制冰装置的设计为依据,从冷负荷计算、蒸发器设计、脱冰方式及自控方案等方面分析和探讨了渔船用海水制冰装置的设计思路,为渔船用海水制冰装置的设计及改进提供参考。 相似文献
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Porter G 《Science (New York, N.Y.)》1987,236(4804):970-972
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Data about biodiversity are either scattered in many databases or reside on paper or other media not amenable to interactive searching. The Global Biodiversity Information Facility (GBIF) is a framework for facilitating the digitization of biodiversity data and for making interoperable an as-yet-unknown number of biodiversity databases that are distributed around the globe. In concert with other existing efforts, GBIF will catalyze the completion of a Catalog of the Names of Known Organisms and will develop search engines to mine the vast quantities of biodiversity data. It will be an outstanding tool for scientists, natural resource managers, and policy-makers. 相似文献
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Gillette R 《Science (New York, N.Y.)》1973,181(4096):252
Due to a typographical error in the 15 June issue of Science (column 1, fourth line from the bottom, page 1152), the dates of the Mexican Revolution were incorrectly given as 1910-1970; the correct dates are 1910-1917. In the 21 June issue (column 1, paragraph 1, page 1263), the number of technicians and engineers Mexico intends to send abroad for training this year was given as 200; the correct number is 2000. 相似文献
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Gillette R 《Science (New York, N.Y.)》1973,180(4091):1151-1154
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Levin H 《Science (New York, N.Y.)》1987,236(4809):1683-1684
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Gillette R 《Science (New York, N.Y.)》1972,176(4039):1108-1109
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