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Effects of pre-oxidation temperature and air volume on oxidation thermogravimetric and functional group change of lignite.
PLoS One
January 2025
College of Safety Science and Engineering, Liaoning Technical University, Fuxin, Liaoning, China.
To investigate the impact of the oxidation temperature and variations in airflow conditions on coal spontaneous combustion characteristics, pre-oxidized coal samples were prepared using a programmed temperature rise method. Synchronous thermal analysis experiments and Fourier transform infrared spectroscopy were conducted to explore changes in the thermal effects and functional group content of the coal samples, respectively. The results indicate that variations in pre-oxidation conditions primarily in fluence the activation temperature and maximum weight loss temperature of the coal samples, while exerting a lesser impact on the critical temperature and ignition point.
View Article and Find Full Text PDFUntangling the Efficient Boron-Initialized Hydroxyl-Terminated Polybutadiene Combustion for High Energetic Solid Propulsion Systems.
J Phys Chem A
January 2025
Department of Chemistry, University of Hawai'i at Manoa, Honolulu, Hawaii 96822, United States.
Highly energetic boron (B) particles embedded in hydroxyl-terminated polybutadiene (HTPB) thermosetting polymers represent stable solid-state fuel. Laser-heating of levitated B/HTPB and pure HTPB particles in a controlled atmosphere revealed spontaneous ignition of B/HTPB in air, allowing for examination of the exclusive roles of boron. These ignition events are probed via simultaneous spectroscopic diagnostics: Raman and infrared spectroscopy, temporally resolved high-speed optical and infrared cameras, and ultraviolet-visible (UV-vis) spectroscopy.
View Article and Find Full Text PDFAdsorbent Properties of Porous Boron Nitride and Activated Carbon: A Comparative Study.
ACS Omega
October 2024
Chair of Thermal Process Engineering, University of Duisburg-Essen, Duisburg 47057, Germany.
Porous boron nitrides possess beneficial properties such as high thermal and chemical stability which are critical for applications in adsorption processes. In order to assess possible fields of applications, trace-level adsorption isotherms of different hydrocarbons on two synthesized porous boron nitrides and two commercial activated carbons are compared. By normalizing the adsorptive loadings on the micropore surface area, superior adsorption performances of the BN materials on polar and aromatic adsorptives with up to 50% higher loadings compared to the activated carbons can be shown.
View Article and Find Full Text PDFCPR-Induced Consciousness during Ventricular Fibrillation: Case Report and Literature Review.
Emerg Med Int
September 2024
Emergency Department Shengjing Hospital of China Medical University, Shenyang, Liaoning, China.
Introduction: Over the years, numerous studies have suggested the occurrence of a peculiar phenomenon known as "CPRIC" during the revival process. The revelation of this phenomenon has ignited widespread discussion and investigation, yet many enigmas remain unsolved. This study describes the case of a 52-year-old man diagnosed with acute anterior myocardial infarction, who experienced ventricular fibrillation while awaiting further treatment.
View Article and Find Full Text PDFSolid Metal Chemical and Thermal Injury Management.
Mil Med
August 2024
Perelman School of Medicine, University of Pennsylvania; Division of Trauma, Surgical Care, and Emergency Surgery, Philadelphia, PA 19104, USA.
Introduction: Solid metals may create a variety of injuries. White phosphorous (WP) is a metal that causes both caustic and thermal injuries. Because of its broad use in munitions and smoke screens during conflicts and wars, all military clinicians should be competent at WP injury identification and acute therapy, as well as long-term consequence recognition.
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