Xem 1-10 trên 10 kết quả Temporal scale
  • Web search is an information-seeking activity. Often times, this amounts to a user seeking answers to a question. However, queries, which encode user’s information need, are typically not expressed as full-length natural language sentences — in particular, as questions. Rather, they consist of one or more text fragments.

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  • Landscape ecology continues to grow as an exciting, dynamic ecological discipline. With its broadscale emphasis and multidisciplinary approach, landscape ecology lends itself both to basic research and to applications in land management, land-use planning, wildlife management, ecosystem management, and conservation biology.

    pdf337p phoebe75 01-02-2013 30 12   Download

  • Numerous authors proposed chapters on their work, and those presented here are the fruit of those proposals. As editor of this book, it has been my pleasure to collaborate with these many, fine contributing scientists. This text brings forth a great amount of fresh information on the biogeography and ecology of poorly known taxa and landscapes, and explores biogeographic processes not previously studied. The assembled work is an anthology of issues in modern biogeography, with topics ranging across regional to global spatial scales, and ecological to evolutionary temporal scales.

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  • This book proposes a framework for a national-scale program to monitor changes in mercury concentrations in the environment following the reduction of atmospheric mercury emissions. The book is the product of efforts initiated at a workshop held in Pensacola, Florida, in September 2003, involving more than 30 experts in the fields of atmospheric mercury transport and deposition, mercury cycling in terrestrial and aquatic ecosystems, and mercury bioaccumulation in aquatic food webs and wildlife.

    pdf218p 951628473 07-05-2012 30 8   Download

  • The human body is composed of structures organized in a hierarchical fashion: from biomolecules assembled into polymers, to multimeric assemblies such as cellular organelles, to individual cells, to tissues, to organ systems working together in health and disease- each dominated by a characteristic length scale. Decades of science and engineering are now converging to provide tools that enable the orderly manipulation of biological systems at previously inaccessible, though critically important, length scales (...

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  • Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Spatio-Temporal Video Object Segmentation via Scale-Adaptive 3D Structure Tensor

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  • Knowing nature is a complex, multiple, and highly political process. This is clearly illustrated by looking at the knowledge and management of a piece of land, seemingly isolated but impacting and impacted by decision- making processes, politics, and technology around the world. A barren stretch of ground in the Sahelian region of West Africa holds diverse meanings to different people and institutions. Livestock herders value it for its proximity to a water point and for the grass it will grow once the rains come.

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  • The biological sciences have become more quantitative and information-driven since emerging computational and mathematical tools facilitate collection and analysis of vast amounts of biological data. Complexity analysis of biological systems provides biological knowledge for the organization, management, and mining of biological data by using advanced computational tools. The biological data are inherently complex, nonuniform, and collected at multiple temporal and spatial scales.

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  • Basic concepts of production function. Historical background and characteristics of different forms of production functions- linear, quadratic, square-root, Spillman, cubic, semi-log, Cobb-Douglas, trascedental, CES, VES and Leontief. Static and dynamic production functions and their applications. Frontier production functions. Dualities between production, cost and profit functions. Derivation of output supply and factor demand functions from production and profit functions. Optimisation and resource allocation. Multiple product relationships. Production possibility curves.

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  • Our framework assumes that funds' sensitivities to passive assets are constant over time. One way of relaxing this assumption is to model these coe±cients as linear functions of state variables, as for example in Ferson and Schadt (1996) and Shanken (1990). In such a modi¯cation, passive asset returns scaled by the state variables can be viewed as returns on additional passive assets (dynamic passive strategies), and the approach developed here could be extended to such a setting. Another approach to dealing with temporal variation in parameters could employ data on fund holdings.

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