维普中文期刊产品整合服务
5篇 您的检索式:作者名="J.Keith"
    题名 作者 年代 出处 被引量
1Global assessment of nitrogen fertilizer:The SCOPE/IGBP Nitrogen Fertilizer Rapid Assessment Project显示文摘Nitrogen (N) availability is a key role in food and fiber production. Providing plant-available N through synthetic fertilizer in the 20th and early 21st century has been a major contributor to the increased production required to feed and clothe the growing human population.To continue to meet the global demands and to minimize environmental problems, significant improvements are needed in the efficiency with which fertilizer N is utilized within production systems. There are still major uncertainties regarding the fate of fertilizer N added to agricultural soils and the potential for reducing losses to the environment. Enhancing the technical and economic efficiency of fertilizer N is seen to promote a favorable situation for both agricultural production and the environment, and this has provided much of the impetus for a new N fertilizer project.To address this important issue, a rapid assessment project on N fertilizer (NFRAP) was conducted by SCOPE (the Scientific Committee on Problems of the Environment) during late 2003 and early 2004. This was the first formal project of the International Nitrogen Initiative (INI). As part of this assessment, a successful international workshop was held in Kampala, Uganda on 12 -16 January, 2004. This workshop brought together scientists from around the world to assess the fate of synthetic fertilizer N in the context of overall N inputs to agricultural systems, with a view to enhancing the efficiency of N use and reducing negative impacts on the environment.Regionalization of the assessment highlighted the problems of too little N for crop production to meet the nutrient requirements of sub-Saharan Africa and the oversupply of N in the major rice-growing areas of China. The results of the assessment are presented in a book (SCOPE 65)which is now available to provide a basis for further discussions on N fertilizer.Arvin R.Mosier J.Keith Syers John R.Freney 2005Science China(Life Sciences)2005,48,z2:3
2Archaeolithoporella and Tubiphytes : Affinties and Paleoecology in Permian Reefs of South China显示文摘Archaeolithoporella is one of the most important Permian reef-building organisms, but itsaffinity has long been controversial. It was first reported in Japan and was considered as a coralline red alga. Since then it has been recognized in Permian reefs in other parts of the world. Many researchers have studied the materials they had found and the Japanese holotype specimen. Most have concluded that it is a problematic alga. or just a problematica because of weak criteria for definition. Some have even considered it inorganic. However, relict cellular structures and microtubular laminae found in well-preserved specimens from Permian reefs in South China strongly support a coralline red algal affinity for the genus.In situ preserved Archaeolithoporella is restricted within the typical framework facies and it occurs most abundantly in syndepositionally cemented framestones. This suggests that Archaeolithoporella required a firm substrate and clear but agitated sea water. Archaeolithoporella is often王生海 范嘉松 J.Keith Rigby 1994Science China Chemistry1994,37,6:2
3The High Time Resolution Universe Pulsar Survey – I. System configuration and initial discoveries显示文摘M. J.Keith A.Jameson W.van Straten M.Bailes S.Johnston M.Kramer A.Possenti S. D.Bates N. D. R.Bhat M.Burgay S.Burke‐Spolaor N.D’Amico L.Levin Peter L.McMahon S.Milia B. W.Stappers 2010Monthly Notices of the Royal Astronomical Society2010,,2:1
4NORMAL ACTS OF IRRATIONAL TRUST: MOTIVATED ATTRIBUTIONS AND THE TRUST DEVELOPMENT PROCESS显示文摘J.Mark Weber Deepak Malhotra J.Keith Murnighan 2005Research in Organizational Behavior2005,,:1
5The dynamics of intense work groups:a study of British String Quartets显示文摘J.Keith Murnighan Donald E.Conlon 0,,02:1
返回顶部 每页显示:
共1页 首页 上一页 第1页 下一页 末页 /1 跳转

网站首页 | 关于我们 | 联系我们 | 产品服务 | 客服中心 | 广告服务 | 版权声明 | 网站联盟 | 友情链接 | 售卡网点

版权所有© 渝B2-20050021-1 渝公网安备 50019002500403号 违法和不良信息举报中心

互联网出版许可证 新出网证(渝)字10号 全国400电话 - 免长途话费