|
|
|
|
|
| Trenkel, Verena; Rochet, Marie-joelle. |
| P>1. Metrics have become a standard way for summarizing environmental monitoring results. Different metrics react differently to natural variations and human-induced stressors. We suggest that combined analysis of time trends in selected biological metrics allows identification of biological processes (e.g. individual growth, mortality or recruitment) that have changed (increased or decreased) persistently. Alternatively, time trends in the abundance of sensitive species could indicate changes in environmental stressors. 2. We calculate the joint likelihood of time trends in three metrics and use it to evaluate the evidence in the data for different combinations of metric time trends. A simulation study provides guidelines for interpreting... |
| Tipo: Text |
Palavras-chave: Generalized additive model; Indicators; Likelihood principle; Quadratic programming; Survey data. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00008/11926/8988.pdf |
| |
|
|
| Hartell, Jason G.. |
| “Multifunctionality” emphasizes the benefit externality properties of nonfood products that coincide with agricultural commodity production, some of which also have public-good properties. However, determining the willingness to pay for local benefit externalities is seen as necessary but daunting. This paper pursues the idea that the valuation process might first start by estimating the incentives required to supply various levels of a benefit externality. With the use of carbon sequestration through the adoption of no-till cultivation as an example of a multifunctional benefit externality, mathematical programming is used to derive representative price schedules. The implication for incentive prices are examined in light of risk aversion. |
| Tipo: Journal Article |
Palavras-chave: Carbon sequestration; Externalities; Multifunctionality; Quadratic programming; C61; D62; Q12; Q21. |
| Ano: 2004 |
URL: http://purl.umn.edu/43416 |
| |
|
|
| Deepak, M.S.; Spreen, Thomas H.; VanSickle, John J.. |
| This study evaluates the economic impact of a ban on methyl bromide on the U.S. winter fresh vegetable market for six major crops: tomatoes, green peppers, cucumbers, squash, eggplant, and watermelons. Florida is the primary domestic supplier of these products. Mexico and Texas are the competing suppliers of the five vegetable crops and peppers, respectively. Leontief technologies represent both monocrop and double-crop production systems; linear inverse demand functions represent four demand regions in the U.S. and Canada. By increasing production costs and reducing yields, a ban on methyl bromide decreases Florida's FOB revenues by 54% and increases those of Mexico by 65%. Price increases to U.S. fresh vegetable consumers range from near zero to over... |
| Tipo: Journal Article |
Palavras-chave: Fresh vegetables; Methyl bromide; Pesticide; Quadratic programming; Spatial equilibrium; Crop Production/Industries. |
| Ano: 1996 |
URL: http://purl.umn.edu/15113 |
| |
|
|
| Ahmedov, Zafarbek; Power, Gabriel J.; Vedenov, Dmitry V.; Fuller, Stephen W.; McCarl, Bruce A.; Vadali, Sharada. |
| Traffic flows in the U.S. have been affected by the substantial increase and, as of January 2009, decrease in biofuel production and use. This paper considers a framework to study the effect on grain transportation flows of the 2005 Energy Act and subsequent legislation, which mandated higher production levels of biofuels, e.g. ethanol and biodiesels. Future research will incorporate changes due to the recent economic slowdown. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Ethanol; Biodiesel; Spatial equilibrium; Quadratic programming; Agricultural and Food Policy; Crop Production/Industries; Resource /Energy Economics and Policy. |
| Ano: 2009 |
URL: http://purl.umn.edu/49837 |
| |
|
| |
|
|
| Koo, Won W.; Taylor, Richard D.. |
| This report evaluates the U.S. carrot market using a quadratic programming algorithm. North Dakota ships carrots locally and to Minnesota under both the base and 1,000 acre scenarios. North Dakota starts to ship carrots to Illinois as it produces more under other alternative scenarios. This clearly indicates that North Dakota has a comparative advantage in producing carrots over other neighboring states. North Dakota could produce about 8,000 acres of carrots and market them to North Dakota, Minnesota, and Illinois. Additional production of carrots in North Dakota may not affect the national average price of carrots, but local prices may be affected due to regional competition. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Carrots; Quadratic programming; North Dakota; Marketing; Production Economics. |
| Ano: 1999 |
URL: http://purl.umn.edu/23123 |
| |
|
|
|
