|
|
|
Registros recuperados: 179 | |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
|
Laxminarayan, Ramanan. |
In the past, malaria control efforts in sub-Saharan Africa have relied on a combination of vector control and effective treatment using chloroquine. With increasing resistance to chloroquine, attention has now turned to alternative treatment strategies to replace this failing drug. Although there are strong theoretical arguments in favor of switching to more expensive artemisinin-based combination treatments (ACTs), the validity of these arguments in the face of financial constraints has not been previously analyzed. In this paper, we use a Bioeconomic model of malaria transmission and evolution of drug resistance to examine questions of optimal treatment strategy and coverage when drug resistance places an additional constraint on choices available to the... |
Tipo: Working or Discussion Paper |
Palavras-chave: Malaria; Mathematical models; Drug resistance; Bioeconomics; Health Economics and Policy; I10; I19; C61. |
Ano: 2003 |
URL: http://purl.umn.edu/10699 |
| |
|
| |
|
| |
|
| |
|
|
Petrick, Martin; Ditges, C. Markus. |
On the basis of portfolio selection theory, this paper finds that whole-farm risk must be regarded as a major reason for the low level of credit flow to agriculture in North-western Kazakhstan. A quadratic programming model was used in order (a) to demonstrate the comparatively high overall risk exposition of a typical farm, (b) to show that an inflow of working capital could contribute to risk reduction, and (c) to illustrate short-term risk management strategies. Although there may be a role for the government in reducing risk exposition of agriculture in its current form, natural and economic constraints suggest to pave the way for structural reforms that reduce the importance of agriculture in the rural economy. . |
Tipo: Working or Discussion Paper |
Palavras-chave: Agricultural credit; Kazakhstan; Portfolio selection theory; Risk programming; Agricultural Finance; Q14; G11; C61. |
Ano: 2000 |
URL: http://purl.umn.edu/14939 |
| |
|
| |
|
| |
|
| |
|
|
Archer, David W.; Gesch, Russell W.. |
The value of an innovative seed technology is estimated in a discrete stochastic programming framework for a representative farm in the northern Corn Belt. Temperature-activated polymer-coated seed has the potential to increase net returns by increasing yields due to early planting and use of longer season varieties, as well as reducing yield due to early planting and use of longer season varieties, as well as reducing yield loss due to delayed planting. A biophysical simulation model was used to estimate the impact of polymer-coated seed on corn and soybean yields and on field day availability for five planting periods, three crop varieties, and two tillage systems on two different soils under varying weather conditions. |
Tipo: Journal Article |
Palavras-chave: Biophysical simulation; Corn; Mathematical programming; Soybean; Q12; C61. |
Ano: 2003 |
URL: http://purl.umn.edu/43198 |
| |
|
| |
|
|
Odeck, James. |
This paper provides an assessment of the extent to which targets set by a public authority are achieved by its operational units. A rare DEA framework and its subsequent Malmquist indices are applied on data comprising 19 units over a four year period of 1996 to 1999. The mean efficiency scores by which targets are achieved across the sample years are moderate, in the range 0.81 to 0.93. Average productivity progress across the sample years has been 26 percent. The results illustrate the usefulness of DEA even when there are no inputs and the decomposable Malmquist index for productivity is an asset in exploring causes of productivity growth. |
Tipo: Journal Article |
Palavras-chave: Target achievement; Traffic safety; Data envelopment analysis; Malmquist indices; L92; C61. |
Ano: 2005 |
URL: http://purl.umn.edu/37549 |
| |
|
|
Neal, Mark; Fulkerson, William; Levy, Gil; Wastney, Meryl; Thorrold, Bruce S.; Palliser, Chris; Beukes, Pierre; Folkers, Chris. |
Introducing a stocking rate restriction is one possible course of action for regulators to improve water quality where it is affected by nitrate pollution. To determine the impact of a stocking rate restriction on a range of New Zealand dairy farms, a whole-farm model was optimised with and without a maximum stocking rate of 2.5 cows per hectare. Three farm systems, which differ by their level of feed-related capital, were examined for the changes to the optimal stocking rate and optimal level of animal milk production genetics when utility was maximised. The whole-farm model was optimised through the use of an evolutionary algorithm called differential evolution. The introduction of a stocking rate restriction would have a very large impact on the... |
Tipo: Conference Paper or Presentation |
Palavras-chave: Environmental regulation; Dairy farms; Whole-farm model; Evolutionary algorithm; Environmental Economics and Policy; Livestock Production/Industries; Q12; Q52; C61. |
Ano: 2006 |
URL: http://purl.umn.edu/25620 |
| |
|
| |
Registros recuperados: 179 | |
|
|
|