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1 A Brief History of Atomic Clocks at NIST 开放资源 馆员登记
  Part of the About.com site, this timeline describes the development of atomic clocks from 1945 when Isidor Rabi, a physics professor at Columbia University, suggested that such a c...
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2 A Brief History of Cosmology 开放资源 馆员登记
  This site describes the history of cosmology from the Babylonians and Ancient Greeks through to the early 1980s. Links are provided to biographies of some of the key astronomers in...
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3 A carbon nanotube page 开放资源 馆员登记
  Carbon nanotubes are molecular-scale tubes of graphitic carbon with outstanding properties. They are among the stiffest and strongest fibres known, and have remarkable electronic p...
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4 A Compendium of On-Line Soil Survey Information 开放资源 机器抓取
  网站由国际航空宇宙与地球科学研究所(ITC)土壤科学分部的David G. Rossiter副教授编写。网站提供了大量的有关土壤调查科学的活动、研究所、数据库、研究项目及教学材料等方面的网站链接目录,目录按分类组织,包括:土壤调查研究所、土壤调查活动、土壤分类、应用软件和模型、调查方法与科学技术、土壤评价、土壤调查分类、计算机程序、期刊以及图片等方面的网站。...
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5 A Global Overview of Renewable Energy Sources 开放资源 专家推荐
  European Commission information centre and knowledge gateway for renewable energy, helping to promote the European Union&primes strategy to achieve 12% of RES by 2010.;...
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6 A Guide to Common Marine Fishes of Singapore 开放资源 馆员登记
  This site offers a comprehensive guide to the fishes found off the coast of Singapore. You can browse illustrated species profiles via a list of species' common names or by family ...
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7 A Guide to Mineral Legislation and Regulations in Sweden 开放资源 机器抓取
  This guide is an introduction to the Swedish mineral legislation and regulations. It has no legal status. Those who want to know the exact wording of the Acts are referred to the S...
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8 A Guidebook to Environmental Indicators 开放资源 机器抓取
  Contains information on indicators for environmental management, suggesting a general framework and guidelines suitable for many users and uses. It aims to help by giving a general...
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9 A Level -- Physics -- Current, Charge and Voltage 未开放资源 馆员登记
  Revision resources are provided covering conservation of charge, current electricity, drift velocity, conductors and insulators. Examples are provided, accompanied by videos. For e...
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10 A National Ecological Framework for Canada 开放资源 机器抓取
  The National Ecological Framework for Canada was developed between 1991 and 1999 by the Ecosystems Science Directorate of Environment Canada, and the Center for Land and Biological...
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