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A MODEL FOR THE APPRAISAL OF THE ENVIRONMENTAL IMPACTS OF THE PROJECTS AgEcon
Soliman, Ibrahim.
Social Appraisal of Agricultural Projects
Tipo: Presentation Palavras-chave: Direct cost; External costs; External benefits; Net present value; Sensitivity analysis; Environmental Economics and Policy; Health Economics and Policy; Resource /Energy Economics and Policy; Risk and Uncertainty.
Ano: 1995 URL: http://purl.umn.edu/119883
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A Profitability Analysis of Investment of Peach and Apple Growing in Turkey JARTS
Uzunöz, Meral; Department of Agricultural Economics, Faculty of Agriculture, University of Gaziosmanpasa, Taslıciftlik 60240, Tokat - Turkey; Akcay, Yasar; Department of Agricultural Economics, Faculty of Agriculture, University of Gaziosmanpasa, Taslıciftlik 60240, Tokat - Turkey.
This study was conducted to determine profitability and feasibility of fruit farms by investment analysis in Tokat - Turkey. The criteria of Net Present Value (NPV ), Cost-Benefit Ratio (CBR) and Internal Rate of Return (IRR) were used for investment analysis. Three different discount rates (10%, 8% and 5%) were used to get the NPV and CBR for peach and apple. The NPV for peach were found to be positive (1113.6 $/da; 1454.7 $/da; and 2156.2 $/da). Also the NPV for apple were found to be positive (574.2 $/da; 805.4 $/da; and 1342.9 $/da). In addition to that, the CBR for peach were bigger than 1 (1.38; 1.43 and 1.51) and the CBR for apple were bigger than 1 (1.23; 1.27 and 1.33). The IRR for peach was 25.05 percent and 22.12 for apple. According to the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Economics and Econometrics fruit; Internal rate of return; Investment analysis; Net present value; Sensitivity analysis.
Ano: 2006 URL: http://www.jarts.info/index.php/jarts/article/view/97
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A tool for deterministic and probabilistic sensitivity analysis of epidemiologic studies AgEcon
Orsini, Nicola; Bellocco, Rino; Bottai, Matteo; Wolk, Alicja; Greenland, Sander.
Classification errors, selection bias, and uncontrolled confounders are likely to be present in most epidemiologic studies, but the uncertainty introduced by these types of biases is seldom quantified. The authors present a simple yet easy-to-use Stata command to adjust the relative risk for exposure misclassification, selection bias, and an unmeasured confounder. This command implements both deterministic and probabilistic sensitivity analysis. It allows the user to specify a variety of probability distributions for the bias parameters, which are used to simulate distributions for the bias-adjusted exposure–disease relative risk. We illustrate the command by applying it to a case–control study of occupational resin exposure and lung-cancer deaths. By...
Tipo: Article Palavras-chave: Episens; Episensi; Sensitivity analysis; Unmeasured confounder; Misclassification; Bias; Epidemiology; Research Methods/ Statistical Methods.
Ano: 2008 URL: http://purl.umn.edu/120927
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Análisis de factibilidad económica de la rehabilitación y modernización integral del Distrito de Riego 024, Ciénega de Chapala. Colegio de Postgraduados
Gómez Laurean, Jorge.
El objetivo del Programa de Rehabilitación y Modernización del Distrito de Riego 024 Ciénega de Chapalaradica en fomentar el uso eficiente del agua en la producción agrícola, mediante el impulso al desarrollo de la tecnología en el sector hidráulico, la capacitación de los usuarios, el mejoramiento de la infraestructura de conducción y la aplicación de nuevas tecnologías de riego. Se realizó el análisis de factibilidad económica de dicho programa, mediante el cual se obtuvieron indicadores; tales como Valor Presente Neto (VPN), Tasa Interna de Retorno (TIR) y la relación Beneficio-Costo (R B/C).Para el análisis se consideró la relación básica entre los beneficios y los costos o egresos del proyecto. Los resultados del análisis económico presentan una R...
Palavras-chave: Relación beneficio/costo; Valor presente neto; Tasa interna de retorno; Rentabilidad; Benefit / cost ratio; Net present value; Internal rate of return; Profitability; Sensitivity analysis; Hidrociencias; Maestría Tecnológica; Análisis de sensibilidad.
Ano: 2013 URL: http://hdl.handle.net/10521/2115
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Assessing the impact of different management options using ISIS-Fish*: the French Merluccius merluccius Nephrops norvegicus mixed fishery of the Bay of Biscay ArchiMer
Drouineau, Hilaire; Mahevas, Stephanie; Pelletier, Dominique; Beliaeff, Benoit.
In this paper, we present an approach to compare the impact of different management options oil the dynamics of a mixed fishery. We used ISIS-Fish, a simulation tool aimed at evaluating the impact of spatial and seasonal management measures on the dynamics of mixed fisheries. The French Nephrops norvegicus (Norway lobster) Merluccius merluccius (hake) mixed fishery of the Bay of Biscay was chosen as a Study case. First, we parameterised the Population and exploitation models. We then selected several management measures, including marine protected fishermen's reaction to each measure. Then, a sensitivity analysis (MPAs) and total allowable catches (TAC), and parameterised fish sensitivity analysis was performed according to a fractional factorial...
Tipo: Text Palavras-chave: Simulation design; Sensitivity analysis; Management measures; Spatial model; Fisheries dynamics.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1340.pdf
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Assessing the impact of discretisation assumptions in a length-structured population growth model ArchiMer
Drouineau, Hilaire; Mahevas, Stephanie; Bertignac, Michel; Fertin, A.
Most of the traditional assessment models are age-structured. However, many biological and exploitation processes are more length-dependent than age-dependent, and the required length-age conversion of available data is often not reliable. Consequently, length-structured or age-length structured models have undergone considerable development in recent years. The growth transition matrix used to model the mean growth and growth variability of the population, is of primary importance in a length-structured matrix model. Building this growth transition matrix is not trivial and it is necessary to assess the impact that various assumptions may have to identify robust model structures. In this study, we assess the effects of (1) time and length discretisation,...
Tipo: Text Palavras-chave: Sensitivity analysis; Discrete model; Growth; Length structured model.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4301.pdf
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Behaviour of a floc population during a tidal cycle: laboratory experiments and numerical modelling ArchiMer
Verney, Romaric; Lafite, Robert; Brun-cottan, Jean Claude; Le Hir, Pierre.
An approach combining laboratory experiments and numerical modelling was used to investigate the behaviour of a floc population during an idealized tidal cycle. The experiment was conducted on suspended sediments at a concentration of 93 mg l−1 collected in the field. It was based on a jar test device to reproduce tidal-induced turbulence and coupled with a CCD camera system and image post-processing software to monitor floc size distribution. At the same time, a 0D size-class based aggregation/fragmentation model (FLOCMOD) was developed to simulate changes in the floc population over the tidal cycle. Experimental results revealed strong variability of the behaviour of microfloc and macrofloc populations with respect to the varying shear rates observed in...
Tipo: Text Palavras-chave: Flocculation; Tidal cycle; Laboratory experiment; FLOCMOD; OD model; Sensitivity analysis; Optimization.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00027/13846/11020.pdf
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Bio-economicity of the finishing phase on feedlot of crossbred young bulls slaughtered at different body weights R. Bras. Zootec.
Mello,Renius; Resende,Flávio Dutra de; Queiroz,Augusto César de; Faria,Marcelo Henrique de; Oliveira,André Soares de; Siqueira,Gustavo Rezende.
The objective in this work was to evaluate the economicity of the finishing phase on feedlot of F1 Red Angus × Nellore (½ RA ½ N) and Blond D'Aquitaine × Nellore (½ BA ½ N) crossbred young bulls slaughtered at 480, 520 and 560 kg of body weight. Thirty-six F1 crossbred young bull with 20 months of initial average age: 18 ½RA½ N and 18 ½N½ BA were allotted to a completely randomized design in a 2 × 3 factorial arrangement (genetic group × slaughter weight), with six replicates. The ½ BA ½ N young bulls slaughtered at 480 kg had the highest carcass gain (kg/day), feed efficiency, gross income (R$/day), gross profit of feed (R$/day), break-even cost of the diet (@/t DM) and cost:benefit ratio. The ½ BA ½ N young bulls also had higher dressing percentage than...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Beef cattle; Bioeconomic analysis; Economic feasibility; Profitability; Sensitivity analysis.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982009000100015
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Caractérisation des fonds marins et estimation bathymétrique par inversion de modèle de transfert radiatif : Application à l'imagerie hyperspectrale en milieu corallien ArchiMer
Petit, Tristan.
Airborne hyperspectral imaging is a potential candidate for mapping and monitoring coral reefs at large scale and with high spatial resolution. In this thesis, we first present the processing steps to be applied to hyperspectral signals for extracting information about seabed types, bathymetry and water optical properties, and we discuss their efficiency with respect to two main confounding factors: (i) low signal to noise ratio of the measured signals, and (ii) large number and variability of physical interactions occurring between the entrance of sunlight into the atmosphere and its measurement by the hyperspectral sensor. Considering these limitations, we examine the performance of an already existing water column processing method: semi-analytical...
Tipo: Text Palavras-chave: Récifs coralliens; Bathymétrie; Cartographie des habitats benthiques; Hyperspectral; Modèle de transfert radiatif; Inversion par optimisation; Analyse de sensibilité; Coral reefs; Bathymetry; Seabed type mapping; Hyperspectral; Radiative transfer model; Inversion by optimization; Sensitivity analysis.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00400/51135/51905.pdf
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Combining sensitivity and uncertainty analysis to evaluate the impact of management measures with ISIS-Fish: marine protected areas for the Bay of Biscay anchovy (Engraulis encrasicolus) fishery ArchiMer
Lehuta, Sigrid; Mahevas, Stephanie; Petitgas, Pierre; Pelletier, Dominique.
Spatio-seasonal explicit simulation models can predict the impact of spatial management measures on marine fish populations and fishing activities. As fisheries are complex systems, fisheries simulation models are often complex, with many uncertain parameters. Here, the methodology is provided to deliver fishery diagnostics within an uncertainty context using a complex simulation tool. A sensitivity analysis of the model is performed on model outputs using partial least-squares to identify the most sensitive parameters. The impact of several management measures is then simulated using a statistical simulation design taking into account the uncertainty of the selected sensitive parameters. This approach was applied to the Bay of Biscay anchovy stock using...
Tipo: Text Palavras-chave: Bay of Biscay anchovy; Marine protected area; Sensitivity analysis; Simulation; Uncertainty analysis.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12234/9281.pdf
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Comparative analysis of the food webs of two intertidal mudflats during two seasons using inverse modelling: Aiguillon Cove and Brouage Mudflat, France ArchiMer
Degre, Delphine; Leguerrier, D; Du Chatelet, E; Rzeznik, J; Auguet, Jean-christophe; Dupuy, Christine; Marquis, E; Fichet, Denis; Struski, Caroline; Joyeux, E; Sauriau, Pierre-guy; Niquil, Nathalie.
Inverse analysis was used to model the food webs of two intertidal mudflat ecosystems: Aiguillon Cove (AC) and Brouage Mudflat (BM) (south-western Atlantic coast, France). The aim of the present study is to describe and compare the functioning of these two ecosystems. The method of inverse analysis has been adapted in order to take into account, in a single calculation, two seasons: spring/summer (mid-March to mid-October) and autumn/winter (the rest of the year). Gathering all available data on the two sites, the most important gaps in knowledge were identified with the help of sensitivity analyses: they concerned mainly the exports of material by grazing fish (such as mullet Liza ramada), resuspension of microphytobenthos, and fluxes linked to microfauna...
Tipo: Text Palavras-chave: Atlantic coast; Sensitivity analysis; Tidal flat; Inverse analysis; Steady state; Food web.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-1863.pdf
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Copper Mining and Environmental Costs in Dominica AgEcon
Harris-Charles, Emaline L.; Pemberton, Carlisle A..
A proposal from an international mining company to establish a copper mining operation in the Caribbean island of Dominica could be highly favourable, given the potential for financial benefits associated with such a project. On the downside, such projects are often associated with environmental damage. The area targeted for this copper mine was a rainforest in the north-eastern portion of Dominica occupying around 12 percent of the island’s total land area. A critical question is therefore whether copper mining could be a viable alternative to agrarian uses of the targeted area, if both financial and environmental costs are taken into consideration. A Contingent Valuation Survey of Dominicans and Visitors allowed for inclusion of non-market costs...
Tipo: Journal Article Palavras-chave: Copper mining; Dominica; Environmental costs; Sensitivity analysis; Cost-benefit; Agribusiness; Environmental Economics and Policy; Financial Economics.
Ano: 2007 URL: http://purl.umn.edu/36803
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Développement et ajustement d'un modèle de dynamique des populations structuré en longueur et spatialisé appliqué au stock Nord de merlu (Merluccius merluccius) ArchiMer
Drouineau, Hilaire.
The biology of European hake has been largely studied, however some specific processes of its biology, especially growth and migration, are still poorly known. Those uncertainties have consequences on the quality of the stock assessments and on the stock management by limiting the possibility to assess the effect of spatial management measures. Therefore, we develop an integrated length-structured and spatialised model of population dynamics aiming at improving the estimation of unknown parameters of the population dynamic. The model relies on a state model describing the dynamics of the population and the fishing activity, and on an observation model describing the observation processes and providing a likelihood function. A review of the literature...
Tipo: Text Palavras-chave: Parameters estimation; Migration; Growth; Sensitivity analysis; Likelihood; Spatialised model; Stock assessment; Length structured model; Hake; Estimation de paramètres; Migration; Croissance; Analyse de sensibilité; Maximum de vraisemblance; Modèle spatialisé; Évaluation des stocks; Modèle structuré en longueur; Merlu.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-3710.pdf
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Empirical modelling of the growth of Ruditapes philippinarum by means of non linear regression on factorial coordinates ArchiMer
Goulletquer, Philippe; Bacher, Cedric.
In order to highlight the main factors accounting for the growth of clams in Marennes Oleron Bay, three locations were investigated in 1984-1985. First, factor analysis provided information on fluctuations of the environment. Second, principal components analysis was used to study ecological phenomena. The main axes explained the growth rate, which was included in an allometric model. Its properties were then studied by means of sensitivity analysis.
Tipo: Text Palavras-chave: Sensitivity analysis; Non linear model; Principal components analysis; Ruditapes philippinarum; Trophic relationships; Analyse de sensibilité; Modèle non linéaire; Analyse en composantes principales; Ruditapes philippinarum; Relations trophiques.
Ano: 1988 URL: http://archimer.ifremer.fr/doc/1988/publication-2879.pdf
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Endogenous adjusted Output Quotas - The Abolishment of the Raw Milk Quota in the European Union AgEcon
Lips, Markus; Rieder, Peter.
This paper discusses an approach to implement output quotas in the GTAP model which permits an endogenous adjustment of both the supplied quantity and the quota rent. Since the quota rent is interpreted as additional earnings of the factors used no change of the worldwide GTAP data base is required. Several modifications of the GTAP model and two exogenous coefficients are necessary. Considering uncertain values of one of the coefficients, systematic sensitivity analysis is applied. The abolishment of the raw milk quota in the European Union would lead to a remarkable decrease in raw milk prices in most member countries. The raw milk production increases in Denmark, Ireland, Luxembourg and the Netherlands while it declines in Greece and Portugal. In the...
Tipo: Conference Paper or Presentation Palavras-chave: General equilibrium model; GTAP; Output quota; Raw milk production; Sensitivity analysis; Agribusiness.
Ano: 2002 URL: http://purl.umn.edu/24817
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Estimación maderable y evaluación financiera de plantaciones forestales comerciales de cedro y caoba en Oaxaca, México Colegio de Postgraduados
Bravo Medel, Adrián.
Este estudio generó conocimiento técnico y económico en plantaciones de caoba (Swietenia macrophylla King) y cedro rojo (Cedrela odorata L.) en la región de Tuxtepec, Oaxaca. Los datos de crecimiento provinieron de 58 parcelas permanentes establecidas en 19 plantaciones de caoba-cedro. Los modelos que estiman el volumen total y comercial fueron ajustados con datos provenientes de una muestra no destructiva de árboles. Se construyó un sistema de crecimiento y rendimiento (SCR) que incluye ecuaciones para altura dominante, área basal, diámetro cuadrático, volumen total y volumen comercial a un diámetro mínimo de 5 cm en la punta del fuste. La mayoría de los modelos proporcionaron buenos ajustes y su construcción se baso en la estructura de Schumacher. La...
Tipo: Tesis Palavras-chave: Análisis de sensibilidad; PRODEPLAN; Evaluación financiera; Modelos de crecimiento y rendimiento; Parcelas permanentes; Edad de rotación; Maestría; Forestal; Sensitivity analysis; Financial evaluation; Growth and yield models; Permanent sites; Rotation age.
Ano: 2007 URL: http://hdl.handle.net/10521/1365
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Evaluation of RegCM4 over the CORDEX South America Domain: Sensitivity analysis to the Land Surface Scheme for the Amazon Basin. Repositório Alice
LLOPART, M.; ROCHA, R. P.; CUADRA, S. V..
2014
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Sensitivity analysis.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1011940
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Greenhouse Gas Mitigation through Energy Crops in the United States with Implications for Asian-Pacific Countries AgEcon
Schneider, Uwe A.; McCarl, Bruce A..
Agriculture-based biofuels have the potential to replace fossil fuels, thereby offsetting greenhouse gas emissions. We estimate emission abatement supply curves from energy crops switchgrass, hybrid poplar, and willow under a wide range of sectorwide greenhouse gas emission reduction incentives in U.S. agriculture. The Agricultural Sector Model employed captures market interactions of biofuel production with traditional agricultural production and with alternative emission mitigation strategies. U.S. results suggest an increasing importance of biomass-based electricity for carbon mitigation incentives above an economic threshold of $50 per ton. At incentive levels of $170 per ton and higher, emission offsets from energy crops provide the highest net...
Tipo: Working or Discussion Paper Palavras-chave: Abatement supply curves; Agricultural Sector Model; Biofuel offsets; Energy crops; Greenhouse gas emission mitigation; Mathematical programming; Poplar; Sensitivity analysis; Switchgrass; Willow; Crop Production/Industries; Environmental Economics and Policy.
Ano: 2001 URL: http://purl.umn.edu/18573
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How would the loss of production due to an herbicide have repercussions in the food web of an intertidal mudflat? Sensitivity analysis of an inverse model for Brouage mudflat, Marennes-Oleron Bay, France ArchiMer
Niquil, Nathalie; Kerleguer, G; Leguerrier, D; Richard, Pierre; Legrand, Helene; Dupuy, Christine; Pascal, P; Bacher, Cedric.
The presence of herbicides in the run-off water coming over Brouage mudflat (Marennes-Oleron Bay, France) is suspected to cause a loss of primary production by benthic diatom biofilm. Microphytobenthos being the main primary producer of this ecosystem, it was questioned about what could be the effect of such a modification of primary production on the entire food web that depends on it. The probable impacts were investigated through a sensitivity analysis conducted on the steady-state model of the Brouage mudflat, coupling two seasons and trophic-hydrodynamic flows. The loss of benthic primary production had an effect on compartments at a low trophic level, but was buffered at higher levels because of the compensation of herbivory by other pathways and...
Tipo: Text Palavras-chave: Intertidal mudflat food web; Pollution; Microphytobenthos; Inverse analysis; Sensitivity analysis.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3613.pdf
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Hydrologic Simulations of the Maquoketa River Watershed Using SWAT AgEcon
Jha, Manoj K..
This paper describes the application of the Soil and Water Assessment Tool (SWAT) model to the Maquoketa River watershed, located in northeast Iowa. The inputs to the model were obtained from the Environmental Protection Agency’s geographic information/database system called Better Assessment Science Integrating Point and Nonpoint Sources (BASINS). Climatic data from six weather stations located in and around the watershed, and measured streamflow data from a U.S. Geological Survey gage station at the watershed outlet were used in the sensitivity analysis of SWAT model parameters as well as its calibration and validation for watershed hydrology and streamflow. A sensitivity analysis was performed using an influence coefficient method to evaluate surface...
Tipo: Working or Discussion Paper Palavras-chave: Calibration and validation; Hydrologic simulation; Sensitivity analysis; SWAT.; Environmental Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/51123
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