Coalbed gas (CBG) has been widely used as an important energy source. However, its utilization and allocation system is imperfect in mining areas. During the process, a large amount of CBG discharged into air, causing environmental pollution. In this study, we proposed “full spectrum-domain-time” model. model, by combining high methane concentration power generation, low purification, ultra-low...

a number of theories about the hest method of allocating assets have been developed over the years, managers are concernd about allocating scarce resources, mainly capital, in most productive way. managers want to ensure that the return from the invested resources exceeds the cost of resources finanical theories and finanicial strategies try to facilitate creating optimum value for investors in...

background although liver transplantation is the last resort for treating end stage liver diseases, this medical procedure is not available for all needful patients because of inadequate organ supply. therefore, guidelines have been developed by medical experts to regulate the process. some professionals believe that medical criteria are inadequate for organ allocation in all situations and may...

In this paper, for the Stratified Median Ranked Set Sampling (SMRSS), proposed by Ibrahim et al. (2010), we examine the proportional and optimum sample allocations that are two well-known methods for sample allocation in stratified sampling. We show that the variances of the mean estimators of a symmetric population in SMRSS using optimum and proportional allocations to strata are smaller than ...

In this study, a cross-docking system is designed at strategic and tactical levels. For making the strategic decisions, a multi-objective nonlinear location allocation model for cross-docks is presented based on a distri-bution location allocation model by Andreas Klose and Andreas Drexl. The model is further developed to in-clude the whole supply chain members and the objective functions are w...

water is an essential yet constrained commodity for human communities and ecological systems depend on it. with population growth and economic development, water resource is increasingly declining. over the past two decades, because of changes in population and climate, and relative welfare increase, the per capita consumption of water has increased. thus, optimal use of available water resourc...

The European Union's pioneering carbon Emissions Trading System, the EU ETS, has inspired countries around world to launch their own CO2 markets. This paper analyses evolution of ETS from a political economy perspective, emphasizing interaction economic principles and interests at pivotal moments, showing how each compromise changed scope for future design choices. We focus on allowance allocat...