abstract due to limited water resources and occurrence of recent droughts, the use of new management and planning methods for optimal irrigation scheduling of agricultural crops is inevitable. present of appropriate mathematical and dynamic relationship between yield, evapotranspiration and water use efficiency parameters is the first and most important step in the optimal management of irrigat...

In this document, we have developed a model to analyze the optimal allocation of ownership right in sequential production stage along the global value chains. We have shown that, when the demand elasticity is low (high) relative to the degree of substitution among inputs in sequential production, and the bargaining weight of firm is low (high), integration (outsourcing) is the optimal organizat...

This paper argues that the conventional definition of the elasticity of complementarity is not well suited to deal with the case of increasing returns. It proposes a slightly different formula, that uses a distance function formulation instead of a production function. The proposed definition coincides with the Hicksian measure in case the production function displays constant returns. It is mo...

The theory of factor demand has important implications for the study of the impact of immigration on wages. This paper derives the theoretical implications in the context of a general equilibrium model where the wage impact depends on the elasticity of product demand, the rate at which the consumer base expands as immigrants enter the receiving country, the elasticity of supply of capital, and ...

in this study, first we evaluate the total amount of support for domestic cotton (ams) for the years 1988 to 1999. then, using time series data for the study years, translog cost function was constrained. having calculated the price elasticity of demand for farm inputs, farmers’ reactions to price changes due to the price liberalization were identified. the results of study showed that in the w...

a housing supply function for private sector has been estimated for the period of 1985-1999. the model was specified, using lucas supply theory and by including internal adjustment costs in producer's decision f or production or inv estment. the distin ctive feature of this model is the utilization. of investment role in housing sector similar to other factors in production function. the r...

Dermal elastic fibres are extracellular matrix protein complexes produced by fibroblasts and involved in skin elasticity. Elastin fibres decrease with age as a result of reduced synthesis and increased degradation, resulting in skin sagging and reduced skin elasticity. In this study, we show that retinol (ROL), known to enhance dermal collagen production, is also enhancing elastin fibre formati...

Arterial elasticity is determined by structural characteristics of the artery wall and by vascular smooth muscle tone. The identity of endogenous vasoactive substances that regulate elasticity has not been defined in humans. We hypothesized that NO, a vasodilator released constitutively by the endothelium, augments arterial elasticity. Seven healthy young men were studied. A 20-MHz intravascula...