Zobrazeno 1 - 10
of 34
pro vyhledávání: '"Zhijun NIU"'
Autor:
Zechao Chang, Xufeng Wang, Dongdong Qin, Jinzhu Yu, Xuyang Chen, Jiyao Wang, Zhijun Niu, Chenlong Qian
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-16 (2024)
Abstract Thick-coal-seam with complex structures and thick-hard roof in the initial mining phase pose various challenges, including a long weighting interval, strong rock pressure, poor top coal caving performance (TCCP), and significant coal loss. T
Externí odkaz:
https://doaj.org/article/1e0c79d8f84c43da99dac450bd0f1426
Publikováno v:
Meitan kexue jishu, Vol 52, Iss 1, Pp 232-243 (2024)
In order to promote the technological development of ultrasonic vibration induced cracking of coal and rock masses, improving the efficiency of coalbed methane production and hard rock excavation in mines, it reviews the development history of ultras
Externí odkaz:
https://doaj.org/article/c6cc207be46842dcb1d8db8d5814f43f
Publikováno v:
Fractal and Fractional, Vol 8, Iss 9, p 546 (2024)
The ultrasonic vibration rock-breaking method has been successfully applied to hard rock due to its high efficiency and controllable energy, providing a novel approach for the development of a more efficient, intelligent, safe, and environmentally fr
Externí odkaz:
https://doaj.org/article/f4156a90eb3442d0acd5513806d3ec41
Publikováno v:
Fractal and Fractional, Vol 8, Iss 5, p 261 (2024)
In order to investigate the effects of elliptical defects on rock failure under ultrasonic vibrations, ultrasonic vibration tests and PFC2D numerical simulations were conducted on rocks with single elliptical defects. The research results indicated t
Externí odkaz:
https://doaj.org/article/5968dc6b8c544b1aa56a28653b2ed3b4
Publikováno v:
Frontiers in Earth Science, Vol 11 (2023)
Externí odkaz:
https://doaj.org/article/ded87211e89a49848089879b881e08da
Publikováno v:
Applied Sciences, Vol 13, Iss 22, p 12424 (2023)
Ultrasonic high-frequency vibrational fracture technology can compensate for the deficiencies of traditional fracture methods and has promising applications in underground rock drilling engineering. In this study, ultrasonic high-frequency vibrationa
Externí odkaz:
https://doaj.org/article/ad4fdf751531432cbe95d324732e8f55
Publikováno v:
Frontiers in Earth Science, Vol 11 (2023)
During the mining of thick coal seams under the gully slope, the mining-induced fractures are prone to connect with the gully runoff, which may induce potential water hazards and affect underground production. Based on the occurrence characteristics
Externí odkaz:
https://doaj.org/article/49b14f9a9e5244219751c87f6a4cb151
Autor:
Jiyao Wang, Xufeng Wang, Xuyang Chen, Liang Chen, Zhanbiao Yang, Zechao Chang, Lei Zhang, Zhijun Niu
Publikováno v:
Geofluids, Vol 2022 (2022)
Rock breakage is inevitable for creating openings in underground engineering operations. Ultrasonic vibration has been attracting extensive attention for such a practice considering its outstanding performance in rock breakage. In order to understand
Externí odkaz:
https://doaj.org/article/09c66b1a146846b39fc28a1085655b5e
Publikováno v:
2022 5th International Conference on Electronics and Electrical Engineering Technology (EEET).
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4cea554232f9081a24129334d01b6147
https://doi.org/10.1109/eeet58130.2022.00027
https://doi.org/10.1109/eeet58130.2022.00027
Publikováno v:
Child's nervous system : ChNS : official journal of the International Society for Pediatric Neurosurgery. 38(11)
Objective The aim of this study is to describe MR imaging appearances of the fetal lumbar spine in vivo at different gestational ages (GAs). Methods This retrospective study was approved by the Third Affiliated Hospital of Zhengzhou University. We co
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fbbbcdbff20576425adbcba607deff0d
https://pubmed.ncbi.nlm.nih.gov/35972535
https://pubmed.ncbi.nlm.nih.gov/35972535