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Roosting, Site Fidelity, and Food Sources of Urban Gulls In Massachusetts: Implications For Protecting Public Water Supplies
fidelity food gull roosting urban water quality
2014/12/9
Anyone who has spent time in coastal New England has seen gulls flying overhead and heard their familiar sound; gulls may be one of the most recognizable birds in the world. There are over 50 species ...
非充分供水与充分供水入渗模型参数间关系试验（Experiment on Relations of Infiltration Model Parameter in Non-sufficient and Sufficient Water Supplies）
非充分供水 充分供水 Kostiakov三参数模型
2010/12/29
基于均质土壤的非充分供水与充分供水入渗试验数据，分析了非充分与充分供水入渗过程之间的关系，建立了非充分与充分供水入渗Kostiakov三参数模型参数之间的关系。结果表明：非充分供水积水后入渗过程以充分供水入渗过程为渐近线；非充分与充分供水入渗参数α的比值m随着供水强度的增加而增大、随着黏粒含量的增加而增加、随着砂粒含量的增加而减小、随着土干密度的增加而增加、随着初始含水率的增加而减小，它们之间都较...
Scientists urge global action to preserve water supplies for billions worldwide（图）
Scientists global action water supplies billions worldwide
2009/5/21
Chinese, Indian, American and British scientists have released a conference declaration urging a region-by-region response to increased water scarcity and heightened hazards.
Melting glaciers, weaken...