Results 281 to 290 of about 794,452 (335)

Nonlinear ultrasound simulation for heterogeneous nonlinear coefficient media

The Journal of the Acoustical Society of America, 2013
In medical ultrasound, the use of simulation tools is very common to develop and test new imaging strategies. The existing tools are mainly limited to the linear propagation of ultrasound waves in tissue. A specific difficulty is due to the fact that the nonlinearity of investigated media can be different at different depths and the local value of the ...
François Varray, Christian Cachard, Piero Tortoli, Olvier Basset   +3 more
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Identification of nonlinear piezoelectric coefficients

Journal of Applied Physics, 2018
An identification scheme that exploits the vibration response and generated voltage of an energy harvester is proposed to estimate parameters representing nonlinear piezoelectric coefficients. We develop the governing equations of a cantilever beam with tip mass and a piezoelectric layer using the generalized Hamilton's principle and by accounting for ...
Vamsi C. Meesala, Muhammad R. Hajj
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Nonlinear piezoresistance coefficients of semiconductors

Journal of Applied Physics, 2019
The inconsistency of symmetry relationships in nonlinear piezoresistance coefficients, which is a long-standing puzzle, is resolved by taking into account the complex relations between piezoresistance coefficients and piezoconductance coefficients.
Kazunori Matsuda, Hiroki Uyama, Kazuo Tsutsui   +2 more
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Research on fiber nonlinear coefficient

2017 16th International Conference on Optical Communications and Networks (ICOCN), 2017
We make some measurement research based on CW SPM method, and obtain the non-linear coefficient for the novel ultra low loss& large effective area single mode fiber. And we also discussed the measure uncertainty and non-linear coefficient influence factor.
Hongyan Zhou, Ruichun Wang, Yaping Liu, Xueting Sun, Su Chen, Lei Zhang, Li'yan Zhang, Honghai Wang   +7 more
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Nonlinear elastic coefficients of KDP

Physica B: Condensed Matter, 1996
Abstract A new apparatus for the measurement of velocity changes due to applied mechanical uniaxial stress working from room temperature down to liquid nitrogen temperatures is described. The experimental data obtained with this apparatus allow to calculate nonlinear elastic stiffnesses.
U. Straube, H. Beige
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Local-field correction for nonlinear optical coefficients

Physical Review B, 1993
We formulate the nonlinear optical coefficients in terms of the Matsubara Green's function and its spectral representation. From this a formula for the ab initio calculation of the local-field effect is derived.
, Chui, , Ma, , Kasowski, , Hsu
openaire   +2 more sources

Nonlinear Coefficient Measurement in Highly Dispersive Fibers

Advanced Photonics 2018 (BGPP, IPR, NP, NOMA, Sensors, Networks, SPPCom, SOF), 2018
We present a novel approach for measuring nonlinear coefficients in fibers with significant pulse broadening. We perform a proof-of-concept demonstration for 200-m-long polarization-maintaining and single-mode fibers pumped at 1060 nm with ps pulses.
Castello-Lurbe, David, Carrascosa, Antonio, Silvestre, Enrique, Diez, Antonio, Vermeulen, Nathalie, Andres, Miguel V.   +5 more
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Nonlinear Optical Coefficients

Bell System Technical Journal, 1967
We consider, from a number of different viewpoints, the tensor coefficients which describe second harmonic generation, optical rectification, and the Pockels or linear electro-optic effect in acentric crystals. Stationary perturbation theory is used to calculate the low-frequency limit of the intrinsic electronic nonlinearity neglecting all effects due
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Coefficient of determination in nonlinear signal processing

Signal Processing, 2000
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Dougherty, Edward R., Kim, Seungchan, Chen, Yidong   +2 more
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Expressions for Aberration Coefficients Using Nonlinear Transforms

Optometry and Vision Science, 1997
A matrix method to do nonlinear calculations is described. This is possible only under the special condition when a transformation maps a zero vector onto a zero vector. Geometrical optics conform to this condition and hence matrix methods can be applied to calculate aberrations. Methods to reduce computational complexities using symmetry arguments are
V, Lakshminarayanan, S, Varadharajan
openaire   +2 more sources