This paper investigates the asymmetric relationship between COVID-19 and fossil energy prices through bootstrap Fourier Granger Causality test in quantiles. The empirical results indicate that influences oil natural gas high volatile Meanwhile, no significant causal link is discovered coal market. Therefore, we provide some important policy implications terms of results.

Research on coal-hosted strategic metal ore deposits is an important subject in coal geology and mineral deposit worldwide. However, the related geological characteristics of coals from Vietnam have seldom been investigated, let alone metals coals. This paper investigates mineralogical geochemical Upper Triassic Nui Hong open-pit mine, Thai Nguyen Coalfield, NE Vietnam, with emphasis enrichment...

In order to integrate renewable electricity into the power grid, it is crucial for coal-fired plant boilers operate stably across a wide load range. Achieving steady combustion with low nitrogen oxide (NOx) emissions poses significant challenge burning low-volatile coal in plants. This study focuses on developing decoupling technology operating at loads. A three-dimensional numerical simulation...

Sodium in the coals of West China has received persistent attention due to its high contents and severe pollutions’ problems during coal utilization. A total seven drill samples Jurassic from Tatuo coalfield, Qinghai Province, were collected analysed using optical microscopy, scanning electron microscopy conjunction with energy-dispersive X-ray spectrometry, powder diffraction, inductively coup...

As a tool for exploration of concealed coal seams by modern techniques, determination of the depth of erosion of coal seams with reference to the surface of angular unconformity underlying the remnants of a key bed is conducted for the first time in coal mines of Kerman region. The angular unconformity surface (the initial surface exposure of coal seams) separates the coal seams of Jurassic age...