scholarly journals Major- and trace-element concentrations in soils from two continental-scale transects of the United States and Canada

2005 ◽  
Author(s):  
David B. Smith ◽  
William F. Cannon ◽  
Laurel G. Woodruff ◽  
Robert G. Garrett ◽  
Rodney Klassen ◽  
...  
Keyword(s):  
United States ◽  
Trace Element ◽  
The United States ◽  
Continental Scale ◽  
Element Concentrations

scholarly journals La collaboration scientifique et technologique en Amérique du Nord : un point de vue Canadien

2005 ◽  
Vol 24 (2) ◽  
pp. 269-296
Author(s):  
Charles H. David ◽  
Paul Dufour ◽  
Janet Halliwell
Keyword(s):  
United States ◽  
Open Economy ◽  
North American ◽  
Small Open Economy ◽  
Innovation System ◽  
The United States ◽  
Technology And Innovation ◽  
Continental Scale ◽  
Science Technology ◽  
Science Technology And Innovation

Canada, as a country with a small, open economy, faces the immediate challenge of learning to shape dynamic comparative advantage in the emerging international economy. About 75 % of Canada's trade linkages are with the United States, and a very large component of the Canadian experience of « globalization » is driven by North American economic integration. This integration is taking place in the absence of institutions and policy mechanisms to promote and manage science, technology, and innovation relations on a continental scale. Bilateral s & T arrangements centered on the United States presently characterize the North American innovation System. Circumstances in North America pose three sets of challenges to Canadian s & T policy. 1) Science and technology are increasing in importance in international trade, environmental, and social/cultural matters. This means that Canada must learn to improve its management of an increasingly internationalized domestic s & T System. 2) Canada must cultivate mutually beneficial bilateral s & T relationships with its two partners in NAFTA, Mexico and the United States. 3) Canada must identify where its interests lie in the development and governance of trilateral and international rules and arrangements for science, technology, and innovation.

scholarly journals Continental-Scale Increase in Lake and Stream Phosphorus: Are Oligotrophic Systems Disappearing in the United States?

2016 ◽  
Vol 50 (7) ◽  
pp. 3409-3415 ◽  
Author(s):  
John L. Stoddard ◽  
John Van Sickle ◽  
Alan T. Herlihy ◽  
Janice Brahney ◽  
Steven Paulsen ◽  
...  
Keyword(s):  
United States ◽  
The United States ◽  
Continental Scale

scholarly journals Distribution of toenail selenium levels in young adult Caucasians and African Americans in the United States: The CARDIA Trace Element Study

2011 ◽  
Vol 111 (4) ◽  
pp. 514-519 ◽  
Author(s):  
Pengcheng Xun ◽  
Deborah Bujnowski ◽  
Kiang Liu ◽  
J. Steve Morris ◽  
Zhongqin Guo ◽  
...  
Keyword(s):  
United States ◽  
Young Adult ◽  
African Americans ◽  
Trace Element ◽  
The United States ◽  
Trace Element Study ◽  
Element Study

scholarly journals The Impact of Movements and Animal Density on Continental Scale Cattle Disease Outbreaks in the United States

PLoS ONE ◽  
2014 ◽  
Vol 9 (3) ◽  
pp. e91724 ◽  
Author(s):  
Michael G. Buhnerkempe ◽  
Michael J. Tildesley ◽  
Tom Lindström ◽  
Daniel A. Grear ◽  
Katie Portacci ◽  
...  
Keyword(s):  
United States ◽  
Disease Outbreaks ◽  
The United States ◽  
Continental Scale ◽  
Cattle Disease ◽  
Animal Density ◽  
The Impact

scholarly journals A continental system for forecasting bird migration

Science ◽  
2018 ◽  
Vol 361 (6407) ◽  
pp. 1115-1118 ◽  
Author(s):  
Benjamin M. Van Doren ◽  
Kyle G. Horton
Keyword(s):  
United States ◽  
Bird Migration ◽  
The United States ◽  
Atmospheric Conditions ◽  
The Public ◽  
Continental Scale ◽  
Seasonal Migrations ◽  
Migration Intensity ◽  
And Performance ◽  
Migratory Movements

Billions of animals cross the globe each year during seasonal migrations, but efforts to monitor them are hampered by the unpredictability of their movements. We developed a bird migration forecast system at a continental scale by leveraging 23 years of spring observations to identify associations between atmospheric conditions and bird migration intensity. Our models explained up to 81% of variation in migration intensity across the United States at altitudes of 0 to 3000 meters, and performance remained high in forecasting events 1 to 7 days in advance (62 to 76% of variation was explained). Avian migratory movements across the United States likely exceed 500 million individuals per night during peak passage. Bird migration forecasts will reduce collisions with buildings, airplanes, and wind turbines; inform a variety of monitoring efforts; and engage the public.

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