Results 51 to 60 of about 140,868 (311)

Numerical Simulations and Experiments on Single-Tooth Rock-Breaking

Machines, 2022
The rock-breaking efficiency of a drilling tool directly affects the production costs and progress of foundation construction. It is essential to understand the mechanism of mechanical rock-breaking to improve rock-breaking efficiency.
Heyuqiu Li, Jie Wang, Qi Mei, Kunlan Huang, Qingyi Luo, Jie Dong   +5 more
doaj   +1 more source

A fractal fragmentation model for rockfalls [PDF]

, 2017
The final publication is available at Springer via http://dx.doi.org/10.1007/s10346-016-0773-8The impact-induced rock mass fragmentation in a rockfall is analyzed by comparing the in situ block size distribution (IBSD) of the rock mass detached from the ...
Corominas Dulcet, Jordi, Mavrouli, Olga Christina, Ruiz Carulla, Roger   +2 more
core   +2 more sources

Experimental study of the thermal reaming of the borehole by axial plasmatron [PDF]

, 2019
Purpose. To study rock spallation dynamics in the process of the borehole thermal reaming and analyze energy consumption of the borehole thermal reaming process by plasma jets of the axial plasmatron. Methods. Field experimental study of rock spallation
Dhunnoo, N, Potapchuk, I, Sekar, M, Voloshyn, O, Yemelianenko, V, Zhevzhyk, O, Zhovtonoha, M   +6 more
core   +1 more source

Numerical Simulation Study on Rock Breaking Characteristics of Prismatic PDC Cutter under Triaxial Stress

Shiyou jixie, 2021
The research on rock breaking mechanism of special-shaped non-planar PDC cutter is relatively scarce, and the research on domestic prismatic PDC cutter is even scarcer.
Wei Xiuyan, He Wenhao, Shi Huaizhong, Chen Zhenliang, Xiong Chao, Li Shuowen   +5 more
doaj  

Improvement of hole drilling technology for ore drawing intensification [PDF]

, 2018
Purpose. The improvement of hole drilling for increasing the mineral recovery ratio by ore drawing improvement through blasting. Methods. The drilling parameters were examined for rock dumps.
Gaponenko, I, Golik, V, Morkun, N, Morkun, V   +3 more
core   +1 more source

Optimal Radio Window for the Detection of Ultra-High-Energy Cosmic Rays and Neutrinos off the Moon [PDF]

, 2005
When high-energy cosmic rays impinge on a dense dielectric medium, radio waves are produced through the Askaryan effect. We show that at wavelengths comparable to the length of the shower produced by an Ultra-High Energy cosmic ray or neutrino, radio ...
A.G. de Bruyn, Abbasi, Achterberg, Alvarez-Muñiz, Alvarez-Muñiz, Askaryan, Askaryan, B. Stappers, Baars, Bahcall, Barwick, Bhattacharjee, Bhattacharjee, Bregman, Buniy, Butcher, Chiba, Dagkesamanskii, Deligny, Engel, Falcke, Falcke, Gandhi, Gerasimova, Gorham, Gorham, Gorham, Greisen, H. Falcke, Hankins, Heiken, Huege, J. Bacelar, Korotev, Kravchenko, Lehtinen, Medina-Tanco, O. Scholten, Olhoeft, Protheroe, R. Braun, R.G. Strom, Saltzberg, Saltzberg, Sarkar, Suprun, Takahashi, Takeda, Tamm, Ulrich, Yoshida, Zas, Zatsepin, Zatsepin   +53 more
core   +6 more sources

Design optimization of TBM disc cutters for different geological conditions [PDF]

, 2015
A novel optimization methodology for the disc cutter designs of tunnel boring machines (TBM) was presented. To fully understand the characteristics and performance of TBM cutters, a comprehensive list of performance parameters were investigated ...
Liu, Jingsheng, Xia, Yimin, Zhang, Kui
core   +2 more sources

From rock‐boring organisms to tunnel boring machines: A new rock breaking technology by bioinspiration

Biosurface and Biotribology, 2021
The purpose of this study is to achieve better understanding of associated mechanisms and to recommend and identify new strategies to develop new rock breaking technology for Tunnel Boring Machines (TBMs).
Jing Zheng, Zhixin Wu, Jiahui Nie, Lei Lei, Zhongrong Zhou, Jianbin Li   +5 more
doaj   +1 more source

Experimental Bounds on Masses and Fluxes of Nontopological Solitons [PDF]

, 2000
We have re-analyzed the results of various experiments which were not originally interested as searches for the Q-ball or the Fermi-ball. Based on these analyses, in addition to the available data on Q-balls, we obtained rather stringent bounds on flux ...
A. De Rújula, A. Kusenko, A. Kusenko, A. Kusenko, A. Kusenko, A. L. Macpherson, B. Holdom, B. Holdom, C. Caso, C. G. Callan, Jr., D. J. Ficenec, Donald E. Groom, E. K. Shirk, E. N. Alexeyev, E. Witten, G. D. Starkman, G. D. Starkman, Gilbert L. Cano, J. A. Phipps, J. Alcaraz, J. Arafune, J. Arafune, J. Derkaoui, J. Lindhard, J. R. Morris, K. Enqvist, K. N. Buckland, K. Nakamura, K. Ogure, M. Ambrosio, M. Axenides, P. B. Price, S. Coleman, S. Kasuya, S. Kasuya, S. Nakamura, S. Nakamura, S. Orito, T. Doke, T. Hara, T. Kajita, T. Yoshida, V. A. Rubakov, W. D. Wilson   +43 more
core   +2 more sources

New development of efficient rock breaking technology with diamond bit

Jin'gangshi yu moliao moju gongcheng, 2022
Diamond bit is an important tool for drilling. In recent years, with the application of new composite materials and the continuous progress in precision machining technology, combined with the continuous innovation of drilling equipment, diamond bits have achieved rapid development.
Lina SHEN, Meiling JIA, Jiapin CAI, Haixia WU, Chun LI, Hailong LIU   +5 more
openaire   +1 more source