China Coal Research Institute (China)

Multi-Parameter Nonlinear Acoustic Emission Precursors of Failure in Coal with Different Burst Tendencies

Acoustic emission (AE) monitoring is widely used to characterize coal failure, but specimens with different burst tendencies cannot be distinguished reliably using a single count, energy, b-value, or fractal indicator. This study reanalyzed archived Vallen AE data from uniaxial-c...

Mechanics-Permeability Similarities Between Natural-like and Natural Coal–Rock Specimens—A Comparative Study

Investigating the mechanics-permeability similarities between natural-like and natural gas-bearing coal–rock specimens provides a theoretical basis for using natural-like specimens as substitutes for natural ones in laboratory simulations of the incubation of coal–rock gas compos...

Numerical Investigation of Mixed Mode I-III Fracture Behavior in Sandstone Under Static and Dynamic Loading

Mixed mode I–III fracture commonly occurs in rock masses under complex three-dimensional stress states, yet the combined effects of loading conditions and fracture mode remain unclear. In this study, a heterogeneous sandstone disc model is developed in ABAQUS by coupling the Druc...

Direct Regeneration of Spent LiFePO 4 Using Methionine for Defect Repair and N/S‐Doped Interface Construction

ABSTRACT The coming wave of end‐of‐life electric vehicles presents a formidable challenge for the recycling of spent Li‐ion batteries, particularly those with LiFePO 4 cathodes. The degradation of the LiFePO 4 cathode is primarily attributed to Li loss‐induced lattice defects and...