China's coal resources are being mined gradually deeper. Compared with the shallow part, the content and the emission of gas are significantly increased in the deep coal seam. In the mining of the highly-gassy coal seam, strengthening gas drainage in the goaf and fissure zone can improve the...

Diffusion is the main migration form of coal seam gas. This paper establishes a conceptual diffusion model to describe the microdiffusion process accurately based on the diffusion form and pore scale. First, low-pressure carbon dioxide and nitrogen adsorption experiments were used to obtain the...

Moisture in low-rank coal (LRC) affects methane diffusion properties, which makes it difficult to predict risk of coal and gas outburst accurately. Therefore, four coal samples were prepared and analyzed in this paper. Isothermal adsorption experiment, desorption experiment of samples with...

Multiscale microstructure of tectonic coal evolution determines CBM storage, development and transport mechanism as well as its effect on coal and gas outburst potential. The multi-scale morphological and topological microstructure characterization of original and tectonic coals were performed...

We propose a model where customers are classified into two groups: short lead-time customers who require the product immediately and long lead-time customers to whom the supplier may deliver either immediately or in the next cycle. Unmet orders are backlogged with associated costs. Specifically,...

This paper considers a problem of multi-period supply portfolio selection and execution with demand information updates. A supply portfolio specifies a buyer's decision on selecting sourcing mix from among a group of suppliers. We develop a framework for optimal supply portfolio selection and...

Predicting long-term equity market returns is of great importance for investors to strategically allocate their assets. We apply machine learning methods to forecast 10-year-ahead U.S. stock returns and compare the results to traditional Shiller regression-based forecasts more commonly used in...

Our paper contributes to the common ownership debate by empirically assessing the link between common ownership and profitability as a proxy for market competition. Rather than focusing on single industries, as most related studies do, we assess the common ownership hypothesis in the aggregate,...

The differences between Common but Differentiated Responsibility (CBDR) principle and Equal Treatment for All Ships principle is becoming a stalemate for future policy progress in vessel-based CO2 reduction negotiations. This paper investigates the economic costs of CO2 reduction with and...

The reduction of SOx, NOx, and PM can be helpful to the environment and human health. However, due to their potential to cool the atmosphere, the reduction of such emissions may intensify the global warming, creating a seeming dilemma to policy makers. This paper uses the shipping Emission...