Results 71 to 80 of about 198,366 (252)

Surface-acoustic-wave-driven luminescence from a lateral p-n junction

open access: yes, 2007
The authors report surface-acoustic-wave-driven luminescence from a lateral p-n junction formed by molecular beam epitaxy regrowth of a modulation doped GaAs/AlGaAs quantum well on a patterned GaAs substrate.
Anderson, D.   +11 more
core   +1 more source

Acoustic Emission for Civil Structures [PDF]

open access: yes, 2012
“Acoustic emission” (AE) is the name given to the transient stress waves that are generated by crack growth and many other kinds of material degradation and deterioration. The phenomenon has been known intuitively since the beginnings of knowledge, and studied scientifically for at least a century.
Paul Ziehl, Adrian Pollock
openaire   +3 more sources

Decoherence in quantum dots due to real and virtual transitions: a non-perturbative calculation

open access: yes, 2009
We investigate theoretically acoustic phonon induced decoherence in quantum dots. We calculate the dephasing of fundamental (interband or intraband) optical transitions due to real and virtual transitions with higher energy levels.
C. Cohen-Tannoudji   +3 more
core   +1 more source

The application of acoustic emission technique to fatigue crack measurement [PDF]

open access: yes
The applicability of acoustic emission technique to measure fatigue cracks in aluminum alloy specimens was investigated. There are several variables, such as the metallurgical and the physical treatment of the specimen, that can affect the level of ...
Crews, J. H., Jr.   +2 more
core   +1 more source

Constitutive acoustic-emission elastic-stress behavior of magnesium alloy [PDF]

open access: yes
Repeated laoding and unloading of a magnesium alloy below the macroscopic yield stress result in continuous acoustic emissions which are generally repeatable for a given specimen and which are reproducible between different specimens having the same load
Emerson, G. P., Williams, J. H., Jr.
core   +1 more source

Pulse analysis of acoustic emission signals [PDF]

open access: yes
A method for the signature analysis of pulses in the frequency domain and the time domain is presented. Fourier spectrum, Fourier transfer function, shock spectrum and shock spectrum ratio were examined in the frequency domain analysis and pulse shape ...
Houghton, J. R., Packman, P. F.
core   +4 more sources

Introduction to acoustic emission [PDF]

open access: yes
Typical acoustic emission signal characteristics are described and techniques which localize the signal source by processing the acoustic delay data from multiple sensors are discussed.
Possa, G.
core   +1 more source

Three-Dimensional Heterogeneity of the Pore and Fracture Development and Acoustic Emission Response Characteristics of Coal Rocks in the Yunnan Laochang Block

open access: yesEnergies
Studying the heterogeneity of coal reservoirs is significant to coal bed methane (CBM) exploitation. To investigate the development of the pore–fracture and acoustic emission response characteristics of the coal rock in the Yunnan Laochang block, four ...
Xingzhi Liu   +3 more
doaj   +1 more source

Modifications and Statistical Analysis of Acoustic Emission Models Based on the Damage and Fractal Characteristics

open access: yesAdvances in Materials Science and Engineering, 2018
The damage process is accompanied by the acoustic emission for quasibrittle materials. And in the process of material damage evolution, the length of microcracks satisfies the fractal distribution.
Jie Yang, Yanna Zheng, Huijing Wang
doaj   +1 more source

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