共查询到20条相似文献,搜索用时 15 毫秒
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Kerr RA 《Science (New York, N.Y.)》1983,220(4597):590-591
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Waldrop MM 《Science (New York, N.Y.)》1986,232(4750):578
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Ravussin E 《Science (New York, N.Y.)》2005,307(5709):530-531
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Taylor A Dunne M Bennington S Ansell S Gardner I Norreys P Broome T Findlay D Nelmes R 《Science (New York, N.Y.)》2007,315(5815):1092-1095
We review the potential to develop sources for neutron scattering science and propose that a merger with the rapidly developing field of inertial fusion energy could provide a major step-change in performance. In stark contrast to developments in synchrotron and laser science, the past 40 years have seen only a factor of 10 increase in neutron source brightness. With the advent of thermonuclear ignition in the laboratory, coupled to innovative approaches in how this may be achieved, we calculate that a neutron source three orders of magnitude more powerful than any existing facility can be envisaged on a 20- to 30-year time scale. Such a leap in source power would transform neutron scattering science. 相似文献
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Rieger RM Ladurner P Hobmayer B Martindale MQ Finnerty JR 《Science (New York, N.Y.)》2005,307(5708):353-5; author reply 353-5
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A major reason for the low adoption of modern varieties of seed among small-scale farmers in developing countries is the inability of formal, centralized seed production systems to meet their complex and diverse seed requirements. Drawing on experiences in Uganda with the common bean, the paper proposes seed production by farmer seed enterprises (FSEs) as a strategy for meeting dual objectives: to sustainably distribute and promote modern crop varieties and to establish a regular source of clean seed of either local or modern varieties. It reports on lessons learned from the Ugandan experience and offers a conceptual framework and guidelines for establishing economically and institutionally sustainable FSEs. While FSEs offer a potentially sustainable solution to the problem of seed supply, the challenge of implementing and scaling up this approach in eastern and southern Africa remains formidable. Collaborative linkages need to be fostered between farmers, researchers, agro-enterprise specialists, NGOs, and the formal seed industry. Seed policy reforms need to be implemented and more client-oriented research systems must be institutionalized. 相似文献
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