منابع مشابه
Nonmethane hydrocarbons in the rural southeast United States national parks
Measurements of volatile organic compounds (VOCs) were made at three rural sites in the southeast U.S. national parks: Mammoth Cave National Park, Kentucky; Cove Mountain, Great Smoky Mountains National Park, Tennessee; and Big Meadows, Shenandoah National Park, Virginia. In 1995 the three locations were sampling sites for the Southern Oxidants Study (SOS) Nashville Intensive, and the measureme...
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We present in this study both measurement-based and modeling analyses for elucidation of source attribution, influence areas, and process budget of reactive nitrogen oxides at two rural southeast United States sites (Great Smoky Mountains national park (GRSM) and Mammoth Cave national park (MACA)). Availability of nitrogen oxides is considered as the limiting factor to ozone production in these...
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The foreign policy of states determines the way they behave in the international arena. Accurate analysis of official foreign policy documents of a country is helpful in that it shows what the international priorities of a country are at specific periods. This article reviews the U.S. National Security Strategy documents published in 2002, 2006, 2010 and 2015 from the perspective of the percept...
متن کاملPresent and future nitrogen deposition to national parks in the United States: critical load exceedances
National parks in the United States are protected areas wherein the natural habitat is to be conserved for future generations. Deposition of anthropogenic nitrogen (N) transported from areas of human activity (fuel combustion, agriculture) may affect these natural habitats if it exceeds an ecosystem-dependent critical load (CL). We quantify and interpret the deposition to Class I US national pa...
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In 2010, the United States adopted its first-ever comprehensive set of health system reforms in the Affordable Care Act (ACA). Implementation of the law, though politically contentious and controversial, has now reached a stage where reversal of most elements of the law is no longer feasible. The controversial portions of the law that expand affordable health insurance coverage to most U.S. cit...
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ژورنال
عنوان ژورنال: The Geographical Journal
سال: 1913
ISSN: 0016-7398
DOI: 10.2307/1779060