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| Ali, Md Kamar; Fletcher, Jerald J.; Phipps, Tim T.. |
| Water quality management under the watershed approach of Total Maximum Daily Load (TMDL) programs requires that water quality standards be maintained throughout the year. The main purpose of this research was to develop a methodology that incorporates inter-temporal variations in stream conditions through statistical distributions of pollution loading variables. This was demonstrated through a cost minimization mixed-integer linear programming (MIP) model that maintains the spatial integrity of the watershed problem. Traditional approaches for addressing variability in stream conditions are unlikely to satisfy the assumptions on which these methodologies are founded or are inadequate in addressing the problem correctly when distributions are not normal.... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 2002 |
URL: http://purl.umn.edu/19811 |
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| Gebremariam, Gebremeskel H.; Gebremedhin, Tesfa G.; Schaeffer, Peter V.; Phipps, Tim T.; Jackson, Randall W.. |
| In this paper we develop a spatial panel simultaneous-equations model of business growth, migration behavior, local public services and median household income in a partial lag-adjustment growth-equilibrium framework and utilizing a one-way error component model for the disturbances. This model is an extension of the jobs follow people or people follow jobs literature and it improved previous models in the growth-equilibrium tradition by: (1) explicitly modeling local government and regional income in the growth process; (2) explicitly modeling gross in-migration and gross out-migration separately in order to spell out the differential effects, which used to be glossed over under net population change in previous studies; (3) explicitly incorporating... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Community/Rural/Urban Development. |
| Ano: 2007 |
URL: http://purl.umn.edu/9895 |
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| D'Souza, Gerard E.; Cyphers, Douglas; Phipps, Tim T.. |
| The extent to which individual factors influence the adoption of sustainable agricultural practices is estimated using a logit model and data from a 1990 survey of West Virginia producers. The results are, as expected, different than those for conventional agricultural technologies. For example, the effects of human capital characteristics are significant, while those for structural and institutional characteristics are not. However, the likelihood of adoption of sustainable agricultural practices is affected most by the environmental characteristic of whether or not the producer is aware that ground water contamination exists on his farm. This creates an important "awareness effect" upon which policies to promote sustainable agriculture adoption can... |
| Tipo: Journal Article |
Palavras-chave: Farm Management. |
| Ano: 1993 |
URL: http://purl.umn.edu/31541 |
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| Chambers, Robert G.; Phipps, Tim T.. |
| A farmers choices of tenure and farm size result from a complex interplay of economic factors technology, entrepreneurial ability, and personal preferences. This paper examines the qualitative effects of these factors on tenure and farm size in a dynamic optimization framework. One implication of the theoretical model is that changes in technology should cause systematic differences to be observed between rates of return on farmland and rates earned on comparable long-term assets. This implication is supported by an empirical test. |
| Tipo: Journal Article |
Palavras-chave: Land Economics/Use. |
| Ano: 1988 |
URL: http://purl.umn.edu/32120 |
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