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| Registros recuperados: 15 | |
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| Odening, Martin; Musshoff, Oliver; Utesch, Volker. |
| The objective of this paper is to explore the potential of the real options approach for analyzing farmers’ choice to switch from conventional to organic farming. Understanding the determinants of this decision is relevant in particular for agricultural policy makers when predicting the response of farmers to support programs. After a brief review of the existing literature on barriers to the adoption of organic farming a theoretical model is presented that allows one to incorporate two main features of the adoption decision, namely irreversibility and uncertainty of the returns. The real options model quantifies investment multiples that trigger the adoption of organic farming. Compared with neoclassical models it suggests an inertia of the respective... |
| Tipo: Journal Article |
Palavras-chave: Organic farming; Real options; Switching regression; Hysteresis; Farm Management. |
| Ano: 2004 |
URL: http://purl.umn.edu/97451 |
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| Shikanai-Yasuda,M.A.; Pereira,P.M.; Yamashiro-Kanashiro,E.; Duarte,M.I.S.; Assis,C.M.; Geraldes,E.A.; Saldiva,P.H.N.. |
| Pulmonary dysfunction represents the most important cause of death in patients with paracoccidioidomycosis (PBM). In order to investigate the functional changes of the lungs in the early stages of PBM, a model of benign disease was developed by intratracheal challenge of 12-week old isogenic Wistar rats with 1 x 106 yeast forms of Paracoccidioides brasiliensis. Animals were studied 30 and 60 days after infection, when fully developed granulomas were demonstrable in the lungs. Measurements of airway resistance, lung elastance and tissue hysteresis were made during sinusoidal deformations (100 breaths/min, tidal volume = 2 ml) with direct measurement of alveolar pressure using the alveolar capsule technique. Infection caused a significant increase in... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Experimental paracoccidioidomycosis; Pulmonary mechanics; Tissue mechanics; Alveolar pressure measurements; Hysteresis. |
| Ano: 1997 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1997001000006 |
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| Moller, Joachim. |
| The aim of the paper is to develop a theoretical framework for analyzing regional adjustment processes after idiosyncratic shocks. The model builds on the macroeconomic approach with monopolistic competition on goods and labor markets. It is shown how interregional factor mobility affects wage-setting behavior and labor supply. The dynamics of this extended model are explicitly taken into account. For a special case we can derive the characteristics of the adjustment process analytically. Under certain conditions the model exhibits hysteresis, i.e. temporary shocks on the price level or the unemployment rate can have a permanent effect on production and potential labor supply. It is argued that a suitable method for investigating regional adjustment... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Regional adjustments; Wage formation; Wage-price spiral; Migration; Regional unemployment; Hysteresis; Labor and Human Capital; J30. |
| Ano: 2001 |
URL: http://purl.umn.edu/26180 |
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| Matallo,M.B.; Franco,D.A.S.; Almeida,S.D.B.; Cerdeira,A.L.. |
| A study was conducted to evaluate the sorption and desorption of 14C herbicide saflufenacil (pyrimidinedione) in two soils in the State of São Paulo, classified as Red Yellow Latosol with clayey texture (LVA-1) and medium texture (LVA-2), using the batch method through isotherms. The soils were air dried and sieved a 2 mm mesh. The radioactivity was determined by liquid scintillation spectrometry in acclimatized room (25 ± 2 °C). Sorption isotherms were conducted for 5 concentrations of saflufenacil (5.0; 2.5; 1.0; 0.5 and 0.05 μg mL-1) and the results were adjusted to the Freundlich equation, thus obtaining the parameters of sorption followed by two extractions with 0.01 M CaCl2 to determine desorption parameters similarly to sorption. The results showed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Isotherms; Hysteresis; Herbicides. |
| Ano: 2014 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582014000200017 |
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| FARIA,A.T.; FIALHO,C.A.; SOUZA,M.F.; FREITAS,N.M.; SILVA,A.A.. |
| ABSTRACT: Tembotrione is registered in Brazil for maize and is used in large areas of the country in each harvest. In recent years, producers have reported carryover effects of this herbicide in succeeding crops to maize. This fact can be attributed to tembotrione recommendations without knowing their interactions with tropical soils colloids. In this study, using high-performance liquid chromatography, it was possible to evaluate the influence of chemical and physical attributes on the sorption and desorption of tembotrione, as well as its metabolite AE 1417268, on seven soils from different regions of Brazil. The coefficients referring to sorption and desorption, as well as the hysteresis index (Kf, 1/n and H) of tembotrione and its metabolite were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Herbicide; Sorption coefficient (Kf); Hysteresis; Environmental impact. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100293 |
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| Botelho,Fernando M.; Boschiroli Neto,Nilso J.; Botelho,Silvia de C. C.; Oliveira,Gabriel H. H. de; Hauth,Michele R.. |
| ABSTRACT Knowledge of the water sorption phenomenon in Brazil nut seeds will allow proper handling of this product, especially with regard to adequate conditions for safe storage. Thus, the present study aimed to determine the sorption isotherms (desorption and adsorption) of Brazil nuts, fitting different mathematical models to the experimental data, as well as to examine the hysteresis effect. To obtain the sorption isotherms, the static method was employed at temperatures of 25, 35, 45 and 55 °C and air relative humidities varying from 10 to 80%. The psychrometric conditions of the air were acquired with the aid of acid solutions and specific saturated saline left inside desiccators with the samples. It was verified that for a given isotherm, the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bertholletia excelsa; Moisture content; Hysteresis; Mathematical modeling. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662019001000776 |
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| Baptestini,Fernanda M.; Corrêa,Paulo C.; Vanegas,Jaime D. B.; Leite,Rafael; Botelho,Fernando M.; Campos,Renata C.. |
| ABSTRACT The objective of this study was to model the water sorption kinetics of damaged beans. Grains with initial moisture content of 53.85%, dry basis (d.b.), were used. One portion of the grains was used to obtain desorption isotherms, while the other was subjected to drying until the moisture content of 5.26% (d.b.), so that it was subjected to the adsorption. For the induction of damage, a Stein Breakage Tester was used. To obtain the equilibrium moisture content, grains were placed in a climatic chamber at 20, 30, 40 and 50 ± 1 °C combined with relative humidity of 30, 40, 50, 70 and 90 ± 3%. The GAB model fitted well to the equilibrium moisture experimental data of damaged grains and control. With increasing temperature, the monolayer moisture... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Hysteresis; Adsorption; Desorption; Phaseolus vulgaris L.. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-43662017000800550 |
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| Wilson, Clevo; Tisdell, Clement A.. |
| Use of chemical inputs such as pesticides have increased agricultural production and productivity. However, negative externalities, too, have increased. The externalities include damage to the environment, agricultural land, fisheries, fauna and flora. Another major externality has been the unintentional destruction of beneficial predators of insects which has led to a virulence of many species of agricultural pests. Mortality and morbidity among agricultural workers, especially in developing countries from exposure to pesticides, are also common. The costs from these externalities are large and affect farmers’ returns. However, despite these high costs, farmers continue to use pesticides and in increasing quantities. In this paper, we examine this... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Pesticides; Agriculture; Environment; Human health; Sustainability; Hysteresis; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety. |
| Ano: 2000 |
URL: http://purl.umn.edu/48363 |
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| Registros recuperados: 15 | |
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