Results 71 to 80 of about 122,069 (205)

Potential of South African road technology for application in China

Journal of Traffic and Transportation Engineering (English ed. Online), 2017
One of the main problems with roads and highways in China is the reflection cracking caused by the cement stabilized subbase layers passing through the overlying asphaltic layers.
Alex T. Visser
doaj   +1 more source

Next Big Thing? Methamphetamine in the United States [PDF]

, 2006
A new major study disproving the popular belief that there exists a growing methamphetamine "epidemic" within the United States.
Ryan S. King
core  

ANALYSIS OF THE IMPACT OF DIFFERENT BLAST ENERGIES ON ROCK CRUSHING USING NUMERICAL MODELLING

Rudarsko-geološko-naftni Zbornik
The propagation of waves generated by an explosion induces both tensile and compressive stresses in the rock, impacting its mechanical and dynamic behaviour and ultimately leading to failure.
Seyed Mohammad Reza Sahlabadi, Kaveh Ahangari, Mosleh Eftekhari   +2 more
doaj   +1 more source

Morphology of two dimensional fracture surface

, 2006
We consider the morphology of two dimensional cracks observed in experimental results obtained from paper samples and compare these results with the numerical simulations of the random fuse model (RFM).
Alava M J, Bonamy D Ponson L Prades S Bouchaud E Guillot C, Bouchaud E, de Arcangelis L, Herrmann H J, Mikko J Alava, Nukala P K V V Zapperi S Simunovic S, Phani K V V Nukala, Santucci S Mathiesen J Måloy K J Hansen A Schmittbuhl J Vanel L Delaplace A Bakke J O H Ray P, Stefano Zapperi   +9 more
core   +3 more sources

The Resonator Banjo Resonator, part 2: What makes them really crack? [PDF]

, 2015
A simple experiment quantifies the difference between the sound production of a banjo with and without a resonator back. Driven by a small tweeter mounted inside the pot, for frequencies above about 4500 Hz, the produced external sound is 6 to 10 dB ...
Politzer, David
core   +1 more source

On the interaction of ultrasound with cracks: Applications to fatigue crack growth [PDF]

Partial contact of two rough fatigue crack surfaces leads to transmission and diffraction of an acoustic signal at those contacts. Recent experimental and theoretical efforts to understand and quantify such contact in greater detail are discussed.
Buck, O., Rehbein, D. K., Thompson, R. B.   +2 more
core   +1 more source

Suppression of surface barrier in superconductors by columnar defects

, 2001
We investigate the influence of columnar defects in layered superconductors on the thermally activated penetration of pancake vortices through the surface barrier. Columnar defects, located near the surface, facilitate penetration of vortices through the
A. Buzdin, A. Buzdin, A. Buzdin, A. Buzdin, A. E. Koshelev, A. I. Buzdin, C. J. van der Beek, D. Yu. Vodolazov, E. Zeldov, G. S. Mkrtchyan, I. M. Lifshitz, J. K. Gregory, L. Burlachkov, M. Konczykowski, R. G. Mints, R. G. Mints, V. M. Vinokur, V. N. Kopylov   +17 more
core   +1 more source

PP-wave reflection coefficient for vertically cracked media: Single set of aligned cracks

Journal of Applied Geophysics, 2023
The main goal of this paper is to analyse the influence of cracks on the azimuthal variations of amplitude. We restrict our investigation to a single set of vertical, circular, and flat cavities aligned along a horizontal axis. Such cracks are embedded in either isotropic surroundings or transversely isotropic background with a vertical symmetry axis ...
openaire   +2 more sources

Crack-Like Processes Governing the Onset of Frictional Slip

, 2006
We perform real-time measurements of the net contact area between two blocks of like material at the onset of frictional slip. We show that the process of interface detachment, which immediately precedes the inception of frictional sliding, is governed ...
A Cochard, A Needleman, AE Filippov, AJ Rosakis, AJ Rosakis, AT Linde, BJ Briscoe, CH Scholz, CJ Ammon, D Coker, D Coker, DJ Andrews, DJ Andrews, FF Abraham, G Rogers, Gil Cohen, HJ Gao, JA Greenwood, Jay Fineberg, JF Archard, JH Dieterich, JR Rice, K Ravi-Chandar, KW Xia, L Crescentini, L Kogut, L Kogut, LB Freund, M Bouchon, M Ohnaka, M Urbakh, Meni Shay, MH Muser, N Lapusta, R Bilham, R Buczkowski, S Bouissou, S Ciliberto, Shmuel M. Rubinstein, SM Rubinstein, T Baumberger, T Lay, TH Heaton, Y Ben-Zion, Y Ben-Zion   +44 more
core   +1 more source

Quantitative Angle Measurement of the Inclined Surface Crack Based on Laser Ultrasonics

Sensors
To measure the angles of oblique surface cracks on a specimen, the method of using the time difference between the reflected and scattered waves generated by the interaction of the surface waves and the crack is proposed.
Haiyang Li, Rui Zhang, Qianghua Pan, Pengfei Wang   +3 more
doaj   +1 more source