Results 41 to 50 of about 140,547 (299)

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

Using a high-pressure water jet-assisted tunnel boring machine to break rock

Advances in Mechanical Engineering, 2020
The concept of tunnel boring machine (TBM) disc cutter rock breaking coupled with high-pressure water jets has been proposed to overcome the difficulties that occur when TBMs encounter extremely hard rocks.
Jinliang Zhang, Yongchang Li, Yuansheng Zhang, Fengwei Yang, Chao Liang, Shunhui Tan   +5 more
doaj   +1 more source

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   +1 more source

Numerical Simulation Study on Characteristics of Tight Hard Sand Broken by Axe-shaped PDC Cutter

Shiyou jixie, 2021
The study on the specific rock breaking mechanism of axe-shaped PDC cutter in the existing literatures is relatively less, the rock breaking characteristic test data are mostly for field application data, and there is short of theoretical basis of tooth ...
Zhao Runqi, Chen Zhenliang, Shi Huaizhong, He Wenhao, Shi Xingxing, Chen Han   +5 more
doaj  

Theoretical and numerical studies of rock breaking mechanism by double disc cutters

International Journal of Mining Science and Technology, 2023
A plane mechanical model of rock breaking process by double disc cutter at the center of the cutterhead is established based on contact mechanics to analyze the stress evolution in the rock broken by cutters with different spacings.
Yiqiang Kang, Renshu Yang, Liyun Yang, Chengxiao Li, Jun Chen, Haonan Zhu, Ning Liu   +6 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

Human alteration of the global nitrogen and phosphorus soil balances for the period 1970-2050 [PDF]

, 2009
The Millennium Ecosystem Assessment scenarios for 2000 to 2050 describe contrasting future developments in agricultural land use under changing climate. Differences are related to the total crop and livestock production and the efficiency of nutrient use
Beusen, A.H.W., Billen, G., Bouwman, A.F.   +2 more
core   +2 more sources

Composite Electrospun Fibers Containing Optimized B‐ and Cu‐Doped Bioactive Glass Sol‐Gel Particles for Potential Soft Tissue Engineering Applications

Advanced Engineering Materials, EarlyView.
This article describes the preparation and characterization of poly(ε‐caprolactone) electrospun composite fibers incorporating sol‐gel‐derived bioactive glass particles doped with B and Cu. Scanning electron microscopy, energy‐dispersive X‐ray spectroscopy, Fourier‐transform infrared spectroscopy, contact angle, acellular bioactivity, mechanical and ...
Elisa Piatti, Marta Miola, Liliana Liverani, Paolo Sartori, Enrica Verné, Aldo R. Boccaccini   +5 more
wiley   +1 more source

Use of the energy of parametric oscillations to improve drilling indices [PDF]

, 2011
Purpose. Increase of the efficiency of using energy of parametric oscillations within the assembly of drilling string bottom by means of solving nonlinear-parametric equations of a “bit – drive motor – drilled-out rock” system to improve drilling indices.
Bakenov, Chernin, Depouhon, Eren, Ghasemloonia, Ghasemloonia, Gibbs, Heisig, Khajiyeva, Parsian, Patil, Saldivar   +11 more
core   +2 more sources

Experimental Study on Rock Breaking Effect of Axe-Shaped and Triangular-Ridged Cutters Under Impact Load

Shiyou jixie
In drilling engineering， optimized cutter selection for specific formations is critical to enhance rock breaking efficiency. To this end， a Split Hopkinson Pressure Bar （SHPB） apparatus was used to conduct impact-induced rock breaking tests of triangular-
Li Yunzhu, Liu Ronghe, Du Jianhong, Liu Bin, Wang Wenwen, XI Yan, Zhang Tianze   +6 more
doaj   +1 more source