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The mechanistical principles and engineering application of roof- cutting for roadway protection in advance of the working face.
Sci Rep
January 2025
State Key Laboratory of Intelligent Construction and Construction and Healthy Operation, Maintenance of Deep Underground Engineering, China University of Mining and Technology, 221008, Xuzhou, Jiangsu, China.
In coal mining operations, it is often challenging to control the deformation of the roadway in front of the working face. The excessive stress from the surrounding rock of the working face and the difficulties in caving the goaf roof have led to a prominent factor that hinders safe and efficient production in coal mines. For this reason, a mechanical model of the stress field in the advance roadway of the working face is established, and the stress evolution law of the surrounding rock before and after cutting the roof of the roadway is analyzed.
View Article and Find Full Text PDFHistory of the medical licensure system in Korea from the late 1800s to 1992.
J Educ Eval Health Prof
January 2025
Department of the History of Medicine and Medical Humanities, Seoul National University College of Medicine, Seoul, Korea.
The introduction of modern Western medicine in the late 19th century, notably through vaccination initiatives, marked the beginning of governmental involvement in medical licensure, with the licensing of doctors who performed vaccinations. The establishment of the national medical school "Euihakkyo" in 1899 further formalized medical education and licensure, granting graduates the privilege to practice medicine without additional examinations. The enactment of the Regulations on Doctors in 1900 by the Joseon government aimed to define doctor qualifications, including modern and traditional practitioners, comprehensively.
View Article and Find Full Text PDFCreep model of bond-degradation in deep granite based on variable radius particle clump.
Sci Rep
January 2025
Xincheng Gold Mine of Shandong Gold Mining Co., Ltd., Laizhou, 261400, Shandong, China.
The creep failure of rocks is related to its microstructure, external loading and time. A nonlinear yield model was introduced to describe the variation in the cohesion and friction angle with plastic strain and intergranular stress. The mechanical properties and creep characteristics of deep granite were obtained by indoor tests, and a variable radius particle clump model was constructed based on the particle flow method.
View Article and Find Full Text PDFNew moderationism: medical discourses on alcohol and the decline of drunkenness in interwar Britain.
Mod Br Hist
January 2025
Graduate School of Business Administration, Hitotsubashi University, Tokyo, Japan.
This article explores the significant yet underappreciated role of medical experts in consolidating the promotion of moderate drinking as a viable solution to Britain's alcohol problem during the interwar period. The country's experience with alcohol regulation in the First World War showed that widespread drunkenness could be effectively managed through policies that restricted the availability of alcohol and encouraged moderation. This realization weakened the political standing of the temperance movement, as support for alcohol prohibition and abstinence waned, leading to the liberalization of social attitudes towards drinking.
View Article and Find Full Text PDFStudy on the microstructural evolution mechanism of the angular contact ball bearing rings during the quenching and tempering process.
Sci Rep
January 2025
School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang, 471003, China.
Since the rings of the angular contact ball bearings (ACBBs) are typical highly sensitive quenching thin-walled structure, the microstructure and properties variation of the rings during the heat treatment process are often difficult to be controlled precisely, and then the service life of the bearings is reduced. Therefore, in this study, the combination of the numerical simulation and experimental was carried out during the quenching and tempering process of ACBBs (7008C), the phase transformation of the inner and outer ring during the heat treatment process were explored, and the law of the microstructure evolution and the mechanical properties variation were revealed. Firstly, based on the multi-field coupling theory of temperature, microstructure and stress-strain field, the numerical simulation model of the heat treatment process of the bearing rings was established.
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