Results 11 to 20 of about 23,348 (198)

Bayesian eikonal tomography using Gaussian processes

open access: yesSeismica, 2023
Eikonal tomography has become a popular methodology for deriving phase velocity maps from surface wave phase delay measurements. Its high efficiency makes it popular for handling datasets deriving from large-N arrays, in particular in the ambient-noise
Jack Muir
doaj   +1 more source

Variational approach to eikonal function computation [PDF]

open access: yesКомпьютерная оптика, 2018
The problem of calculating the eikonal function from the condition of focusing into a prescribed region is formulated as a variational problem and as a Monge-Kantorovich mass transportation problem.
Leonid Doskolovich   +3 more
doaj   +1 more source

Hybrid of differential quadrature and sub-gradients methods for solving the system of Eikonal equations

open access: yesNonlinear Engineering, 2021
Many important natural phenomena of wave propagations are modeled by Eikonal equations and a variety of new methods are needed to solve them. The differential quadrature method (DQM) is an effective numerical method for solving the system of differential
Meher Mehrollah, Rostamy Davood
doaj   +1 more source

THE METHOD OF CALCULATION OF COEFFICIENTS OF THE PHASE ABERRATIONS OF AXIALLY ASYMMETRIC DUAL REFLECTOR ANTENNAS

open access: yesНаучный вестник МГТУ ГА, 2019
Aerodrome-enroute surveillance radar systems (ARSR) of civil aviation are designed for detection of aerial objects and determination of their range and movement parameters.
B. N. Laskin, E. A. Bolelov
doaj   +1 more source

The muon anomalous magnetic moment in QED: three-loop electron and tau contributions [PDF]

open access: yes, 1998
We present an analytic calculation of electron and tau O(alpha^3) loop effects on the muon anomalous magnetic moment. Computation of such three-loop diagrams with three mass scales is possible using asymptotic and eikonal expansions.
Andrzej Czarnecki   +14 more
core   +2 more sources

Software for the numerical solution of first-order partial differential equations

open access: yesDiscrete and Continuous Models and Applied Computational Science, 2019
Partial differential equations of the first order, arising in applied problems of optics and optoelectronics, often contain coefficients that are not defined by a single analytical expression in the entire considered domain.
Yaroslav Yu Kuziv
doaj   +1 more source

Variational interpretation of the eikonal calculation problem from the condition of generating a prescribed irradiance distribution [PDF]

open access: yesКомпьютерная оптика, 2018
The problem of calculation of the light field eikonal defined on a certain surface from the condition of generating a prescribed irradiance distribution on another surface is formulated as a Monge-Kantorovich mass transportation problem. We show that the
Albert Mingazov   +3 more
doaj   +1 more source

Extending the Eikonal Approximation to Low Energy [PDF]

open access: yes, 2014
E-CDCC and DEA, two eikonal-based reaction models are compared to CDCC at low energy (e.g. 20AMeV) to study their behaviour in the regime at which the eikonal approximation is supposed to fail.
Capel, Pierre   +2 more
core   +1 more source

Eikonal Equation Reproduces Natural Landscapes With Threshold Hillslopes

open access: yesGeophysical Research Letters, 2023
Many natural landscapes maintain steep planar hillslopes bounded at a typical angle, beyond which shallow landslides or slope failures remove the excess sediment volume by mass wasting.
Shashank Kumar Anand   +3 more
doaj   +1 more source

R-Current DIS on a Shock Wave: Beyond the Eikonal Approximation [PDF]

open access: yes, 2010
We find the DIS structure functions at strong coupling by calculating R-current correlators on a finite-size shock wave using AdS/CFT correspondence. We improve on the existing results in the literature by going beyond the eikonal approximation for the ...
D. Kharzeev   +7 more
core   +2 more sources

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