Zobrazeno 1 - 10
of 1 774
pro vyhledávání: '"propagation characteristics"'
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-17 (2024)
Abstract Coal, a vital strategic resource, facilitates industrial development and socio-economic progress. Ensuring the high-quality development of the coal industry is crucial for national energy security and safety. Coal and gas outbursts are frequ
Externí odkaz:
https://doaj.org/article/a73ae19d9ef344baacccdb05b106900b
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-19 (2024)
Abstract Over recent years, as digitalization and intelligence in oil wellbore have increased, so have the stricter requirements for wireless communication technology in terms of distance, accuracy, and portability. As a result, it’s necessary to r
Externí odkaz:
https://doaj.org/article/ae252586c9a343e98d1053aa699b8a22
Autor:
Chengzhong GAO, Yanqing WU
Publikováno v:
Meikuang Anquan, Vol 55, Iss 8, Pp 191-197 (2024)
The theory of electromagnetic wave propagation in strata is the basis for underground radio wave detection. There are differences in the propagation of electromagnetic waves in the strata when the detection frequency and coal seam occurrence change.
Externí odkaz:
https://doaj.org/article/3b5f540663f74a5b9dcc3c8ffa4b04c9
Autor:
ZHAO Licai
Publikováno v:
Chengshi guidao jiaotong yanjiu, Vol 27, Iss 8, Pp 166-173 (2024)
Objective The Xiaozhuang Station-Wanshou Station interval shield tunnel is located in a highly fractured rock layer with developed groundwater, facing extremely complex geological conditions and requiring relatively high crack resistance and compress
Externí odkaz:
https://doaj.org/article/648c6f5daf674073b317b5f403cf292e
Publikováno v:
Meitan xuebao, Vol 49, Iss 4, Pp 1941-1951 (2024)
To explore the propagation characteristics of gas explosion-induced coal dust detonations in enclosed pipelines, a custom-developed experimental system was employed for gas explosions involving accumulated coal dust. Various aspects were focused such
Externí odkaz:
https://doaj.org/article/a5dbe3d69d9a4f9ab571b26b40f6fa7f
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-14 (2024)
Abstract Efficient communication is crucial in reducing injuries and fatalities in coal mine accidents, necessitating the study of simulation methods for mine communication. When transceiver antennas are positioned close to the same side of the tunne
Externí odkaz:
https://doaj.org/article/9b3524b63ccf497fa018bdbd562ff75c
Publikováno v:
PeerJ, Vol 12, p e17830 (2024)
Nitraria tangutorum Bobrov., belonging to the family Nitrariaceae, is a drought-tolerant and salt-loving plant and has drawn attention for its good economic and ecological value. As one of the main group species and dominant species in China’s dese
Externí odkaz:
https://doaj.org/article/f64f902cee204711a777c016cf112eb7
Publikováno v:
FirePhysChem, Vol 3, Iss 4, Pp 300-310 (2023)
To investigate the characteristics of rotating detonation waves fueled by liquid kerosene with increasing equivalence ratios, the experiments were performed through increasing the supply of liquid kerosene under three different mass flow rates of oxi
Externí odkaz:
https://doaj.org/article/6640387b9f5c4e73872f42b922ef0ef0
Publikováno v:
Machines, Vol 12, Iss 9, p 600 (2024)
Model-based fault diagnosis serves as a powerful technique for addressing fault detection and isolation issues in control systems. However, diagnosing faults in closed-loop control systems is more challenging due to their inherent robustness. This pa
Externí odkaz:
https://doaj.org/article/8bc2ec4686f149bea6911af490fa01cd
Publikováno v:
Gong-kuang zidonghua, Vol 49, Iss 6, Pp 88-94 (2023)
The ultra wideband (UWB) radar detection technology can achieve mine human target detection for drilling rescue. However, UWB electromagnetic waves are susceptible to the complex environment of catastrophic mines. The UWB radar echo signals are susce
Externí odkaz:
https://doaj.org/article/4a20541717e74c9ea0f9c28f94d6bd52