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Study on influencing factors and prevention measures of coal-rock-gas compound dynamic disaster in deep coal mine mining.
Sci Rep
January 2025
College of Resources, Shandong University of Science and Technology, Taian, 271019, Shandong, China.
Because coal seam mining with high geostress and high gas pressure is prone to coal-rock-gas compound dynamic disasters, a disaster energy equation considering the influence of roof elastic energy is established, and a disaster energy criterion considering the influence of roof elastic energy is derived and introduced into COMSOL software to conduct numerical simulations of coal seam mining under different geostress and gas pressures. The study revealed that the increase of ground stress reduces the gas pressure required for disaster occurrence. When the gas pressure reaches a certain value, the disaster will occur even if the ground stress is very small.
View Article and Find Full Text PDFGlobal practical tracking control via output feedback for more general nonlinear systems.
ISA Trans
January 2025
School of Electrical Engineering, University of Jinan, Jinan, Shandong 250022, China. Electronic address:
This paper focuses on the issue of global practical tracking control by output feedback for uncertain nonlinear systems with unknown control coefficients and unknown reference signal. Unlike other tracking works, the upper and lower bounds of the unknown control coefficients in the studied nonlinear system are not required to be known, while the nonlinearities are bounded by the unmeasured states multiplying an unknown constant, the polynomial-of-output and the polynomial-of-input. Inspired by related works, an adaptive tracking controller based on a new dynamic high gain has been successfully constructed by combining the universal control idea and the concept of dead-zone with backstepping technique, which effectively handles the impacts of multiple uncertainties.
View Article and Find Full Text PDFFacile and green fabrication of biodegradable aerogel from chitosan derivatives/modified gelatin as absorbent for oil removal.
Int J Biol Macromol
January 2025
Guangxi Key Laboratory of Green Chemical Materials and Safety Technology, College of Petroleum and Chemical Engineering, Beibu Gulf University, Qinzhou 535011, China. Electronic address:
Frequent oil spills have caused increasingly severe pollution of marine water bodies. As a result, exploring green and efficient aerogels to tackles oil pollution is in high demand. In this work, a unique strategy for preparing all-biomass aerogel was innovatively proposed.
View Article and Find Full Text PDFMicrobially degradable phenolic foams based on depolymerized kraft lignin for hydrophilic applications.
Bioresour Technol
January 2025
School of Energy and Environment, City University of Hong Kong, Hong Kong, China. Electronic address:
Hydrophilic phenol-formaldehyde (PF) foams, widely used in floral and hydroponic applications, are produced using phenol typically derived from non-renewable petroleum-based resources. This study examines the potential of depolymerized Kraft lignin (DKL) as a sustainable substitute for phenol in the synthesis of hydrophilic biobased foams. At 50 % DKL substitution, the foams demonstrated excellent water absorption capacities (up to 2557 %), relatively low densities (∼62 kg/m), and nearly 100 % open-cell content.
View Article and Find Full Text PDFStaging of swine carcasses to mitigate leachate contamination in the environment.
Sci Total Environ
January 2025
USDA-ARS National Laboratory for Agriculture and the Environment, Ames, IA 50011, United States of America. Electronic address:
Outbreaks of infectious diseases involving depopulation of animals require on-farm practices to stage carcasses when final disposal methods are unavailable. The current study assessed various materials and techniques for containing carcasses to minimize leachate and biological substances. The tested materials included tarps, soil, corn stover (CS), and lime, while the methods involved covers, chemical additives, barriers, and containment.
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