Henan Polytechnic University

Influence of Electrode Surface State on Air Gap Breakdown Characteristics at the Micrometer Scale

To investigate the influence of electrode surface roughness on gas discharge characteristics under micro-gap conditions, direct-current breakdown experiments were carried out in atmospheric air using a nano-positioning system. Breakdown tests were conducted for five metal electro...

Study on the Thermal Degradation Mechanism Model of Polystyrene Insulation Materials Under Ultraviolet Aging

ABSTRACT Expanded polystyrene (EPS) and extruded polystyrene (XPS) are extensively employed as thermal insulation materials in buildings. However, facade spalling exposes these materials to ultraviolet radiation, triggering progressive aging that compromises their thermal stabili...

Optimization of Blasting‑Induced Roof Cutting Parameters in Key Stratum and Its Application in Gob‑Side Entry Retention Technology

ABSTRACT In the field of mining, conventional methods that rely on protective coal pillars result in significant wastage of coal resources. To achieve the dual objectives of resource recovery and roadway stability control, this study utilizes theoretical analysis, numerical simul...

Pressure-ControlledDynamic Conversion of Replacement–DisplacementMechanisms During ECBM Recovery

Abstract Gas injection pressure is a key parameter controlling enhanced coalbed methane (ECBM) recovery, as it directly influences gas adsorption–desorption, diffusion-seepage, and the dominance of replacement-displacement mechanisms. In this study, carbon dioxide (CO2) and nitro...

Early Identification of Subtle Deformations in Potential Debris Flow Source Areas Using Phase-Unwrapped Convolutional Neural Networks and Long-Time-Series InSAR Technology

Mudslides are sudden and highly destructive; their source areas typically undergo slow, millimeter-scale creep over a period of months or even years before destabilization. If these precursor signals can be detected, valuable time can be gained for disaster prevention and mitigat...