Results 71 to 80 of about 198,366 (252)
Surface-acoustic-wave-driven luminescence from a lateral p-n junction
, 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
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Acoustic Emission for Civil Structures [PDF]
, 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
, 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
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The application of acoustic emission technique to fatigue crack measurement [PDF]
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
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Constitutive acoustic-emission elastic-stress behavior of magnesium alloy [PDF]
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.
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Pulse analysis of acoustic emission signals [PDF]
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.
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Introduction to acoustic emission [PDF]
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.
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Some Aspects of Acoustic Shock Emission of High-Speed Nozzles [PDF]
, 1969 Abraham C. Peter
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EnergiesStudying 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
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Advances 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
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