Zobrazeno 1 - 4
of 4
pro vyhledávání: '"Lipei DING"'
Autor:
Yonglong WANG, Yuxiang PEI, Yuning SUN, Zaijiang YU, Lipei DING, Yue WU, Jiakuan GUO, Kang DU
Publikováno v:
Meitan xuebao, Vol 48, Iss 9, Pp 3420-3427 (2023)
In order to solve the technical problem of gas blowhole over-limit in gas drainage holes, a method of weakening the gas gushing in the borehole was proposed. The structural model of a hole-bottom combined damping drilling tool was constructed. By est
Externí odkaz:
https://doaj.org/article/bc9875b47beb48579ecd4fddcbf67a27
Publikováno v:
Energies, Vol 15, Iss 10, p 3763 (2022)
The borehole drilling distance is short in soft and gas outburst-prone coal seams because of drill pipe jamming induced by cuttings accumulating in the borehole, hindering coal mine gas hazard prevention and utilization. A surface multi-hole (SMH) dr
Externí odkaz:
https://doaj.org/article/ddd3d4dcd53a427a9004249581f24068
Publikováno v:
SPIE Proceedings.
The configuration and function of the device have been described in detail. Using the device, we can verify all the main performance parameters of existing optical theodolites. We solve the problem of small-angle measurement by using one linear CCD.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b9325ca84ecd58a4a1aba13c4364118c
https://doi.org/10.1117/12.783186
https://doi.org/10.1117/12.783186
Publikováno v:
SPIE Proceedings.
The main components of the device are three optical tubes. The upper tube and lower tube are two mini autocollimators. The middle tube is a mini autocollimator with two-dimensional small angle synchronous measurement function. The optical configurati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a8506e9350e3f5faaf23b29b3a2dc88d
https://doi.org/10.1117/12.791130
https://doi.org/10.1117/12.791130