Undoubtly, land degradation causes apparent decrease of natural resources potential which are highly linked to desertification. Different countries and also international organization have realized a great number of projects to combat desertification. Unfortunately these projects have not reach to their goals. The experiences shows that the reason of these unsuccessful works is lack of consider...

Agricultural tillage practices are important human-induced activities that can alter carbon emissions from agricultural soils and have the potential to significantly contribute to reductions in greenhouse gas emission (Lal et al, 1998). This research investigates the expected costs of sequestering carbon in agricultural soils under different subsidy and market-based policies. Using the detailed...

Characteristics of high-efficiency gas turbine cogeneration systems using low Btu gas (LBG) are first analysed. Raising the turbine inlet temperature and incorporating a regenerator are both investigated as methouds to improve the efficiency of the cogeneration system (CGS). Taking a gas obtained by pyrolyzing municipal refuse as an example of an LBG, various thermodynamic characteristics of th...

This paper has two main objectives. The rst is to develop dynamic models of commercial sheries di erent from the existing models. The industry is assumed to have a well de ned index of performance based on which it either invests or otherwise. We do not however, assume that the industry or rm is e cient or optimal in its operations. The hypotheses in the models are quite general, making the mod...

Community of practice theory is inherently a social theory. As such it is distinct from more individualist accounts of human behavior, such as main-stream economics. It is, then, unsurprising that community of practice theory and economics tend to favor quite different accounts of knowledge. Taking a community of practice perspective, this paper challenges economists' attempts to reduce knowled...

Abstract Many applied settings in empirical economics require estimation of a large number individual effects, like teacher effects or location effects; health economics, prominent examples include patient doctor hospital effects. Increasingly, these are the object interest estimation, and predicted often used for further descriptive regression analyses. To avoid imposing distributional assumpt...

Microeconomic lumpiness matters for macroeconomics. According to our DSGE model, it explains roughly 60% of the smoothing in the investment response to aggregate shocks. The remaining 40% is explained by general equilibrium forces. The central role played by micro frictions for aggregate dynamics results in important history dependence in business cycles. In particular, booms feed into themselv...

We derive general distribution tests based on the method of Maximum Entropy density. The proposed tests are derived from maximizing the differential entropy subject to moment constraints. By exploiting the equivalence between the Maximum Entropy and Maximum Likelihood estimates of the general exponential family, we can use the conventional Likelihood Ratio, Wald and Lagrange Multiplier testing ...