Zobrazeno 1 - 10
of 14 702
pro vyhledávání: '"specific energy"'
Publikováno v:
Geomechanics and Geophysics for Geo-Energy and Geo-Resources, Vol 10, Iss 1, Pp 1-13 (2024)
Abstract Rock-breaking specific energy model of bit is the key foundation of evaluation and optimization of downhole drilling condition, while some necessary parameters for the existing models is difficult to measure directly while drilling. Aiming t
Externí odkaz:
https://doaj.org/article/95b1cb0d30b6433bae8a7579a5467256
Publikováno v:
Journal of Applied and Computational Mechanics, Vol 10, Iss 4, Pp 694-709 (2024)
Flywheels used for energy storage may be assembled by press fitting or bonding of concentric rotor parts. During operation, each part is subjected to a superposition of stress fields associated with centrifugal loading and with contact at the compone
Externí odkaz:
https://doaj.org/article/34e0a2a0cedb48479bdc0fb167acc384
Publikováno v:
Alexandria Engineering Journal, Vol 104, Iss , Pp 434-450 (2024)
Gravelly soil strata exhibit heterogeneity and nonlinearity in their physical and mechanical properties, leading to volatile fluctuations of shield scraper force. Understanding the performance of shield scrapers in gravelly soils is significant for t
Externí odkaz:
https://doaj.org/article/1b71c54cc5be492a9485117bf42e3bbd
Publikováno v:
Underground Space, Vol 18, Iss , Pp 151-161 (2024)
High-pressure waterjet-assisted tunnel boring machine (WTBM) is an efficient method for improving the tunneling performance of a tunnel boring machine (TBM) and reducing the wear of its disc cutters in hard rock with high geostresses. Confining press
Externí odkaz:
https://doaj.org/article/ae86ea4d021a413bb88e7ed2cfd64800
Publikováno v:
مجلة جامعة كركوك للعلوم الزراعية, Vol 15, Iss 3, Pp 252-263 (2024)
This research study included evaluating the effect of patterns of distribution of chisel plow tines on field performance at different operating factors by studying three factors .The first is patterns of distribution of the chisel plow tines at three
Externí odkaz:
https://doaj.org/article/e872f00896a54bdfb67e4a3f77e7630e
Autor:
Lishan Qi, Anfu Guo, Xunjin Li, Peng Qu, Shaoqing Wang, Shuai Guo, Chang Liu, Lu Wang, Lvfa Yin, Zhong Chen, Diangang Wang
Publikováno v:
Journal of Materials Research and Technology, Vol 32, Iss , Pp 347-361 (2024)
Honeycomb structures have been widely used in aerospace and automotive applications due to their high efficiency, high strength and high specific stiffness. However, most of the reported publications have focused on the surface shape variations of ho
Externí odkaz:
https://doaj.org/article/a5c82954998a4870ac7fbdf7f3f75e3a
Publikováno v:
Underground Space, Vol 19, Iss , Pp 138-152 (2024)
The Sichuan-Xizang Railway is a global challenge, surpassing other known railway projects in terms of geological and topographical complexity. This paper presents an approach for rapidly profiling rock mass quality underneath tunnel face for the ongo
Externí odkaz:
https://doaj.org/article/c0dc8d7d8c774b859b7c621229a66c1a
Publikováno v:
Scientific Reports, Vol 14, Iss 1, Pp 1-17 (2024)
Abstract Monitoring while drilling (MWD) is a crucial task in mining operations. Accurately measuring drill and rock-related operating parameters can significantly reduce the cost of drilling operations. This study explores the potential of monitorin
Externí odkaz:
https://doaj.org/article/7477ec6452b0430a9ce2876e9126b2c2
Autor:
Günther H. Hartmann, Hans G. Menzel
Publikováno v:
Zeitschrift für Medizinische Physik, Vol 34, Iss 3, Pp 468-476 (2024)
Purpose: The Type A standard uncertainty in Monte Carlo (MC) dose calculations is usually determined using the “history by history” method. Its applicability is based on the assumption that the central limit theorem (CLT) can be applied such that
Externí odkaz:
https://doaj.org/article/50a6e8b8a41a4c4498ded3037338b3f4