Zobrazeno 1 - 10
of 62
pro vyhledávání: '"K.-J. Langenberg"'
Autor:
R. Marklein, K. J. Langenberg, K. Mayer, J. Miao, A. Shlivinski, A. Zimmer, W. Müller, V. Schmitz, C. Kohl, U. Mletzko
Publikováno v:
Advances in Radio Science, Vol 3, Pp 167-174 (2005)
This paper presents recent advances and future challenges of the application of different linear and nonlinear inversion algorithms in acoustics, electromagnetics, and elastodynamics. The presented material can be understood as an extension of our pr
Externí odkaz:
https://doaj.org/article/8adb98b8934e47b3a3643ea3f233b9ad
Autor:
René Marklein, K. J. Langenberg
Publikováno v:
Wave Motion. 41:247-261
Transient plane wave theory for anisotropic, in particular transversely isotropic lossless materials is formulated and evaluated as a coordinate-free approach leading to comparatively simple analytical expressions for phase wave speeds, polarization
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1f806a6308cbb59a929eb9066bfab49b
https://doi.org/10.1016/j.wavemoti.2004.05.007
https://doi.org/10.1016/j.wavemoti.2004.05.007
Autor:
K. J. Langenberg, Klaus Mayer, Kannan Balasubramanian, V. Schmitz, R. Hannemann, T. Krylow, René Marklein
Publikováno v:
Inverse Problems. 18:1733-1759
Convenient tools for nondestructive evaluation of solids can be electromagnetic and/or elastodynamic waves; since their governing equations, including acoustics, exhibit strong structural similarities, the same inversion concepts apply. In particular
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::06c2c8a17440cd06aad370a28c40472f
https://doi.org/10.1088/0266-5611/18/6/319
https://doi.org/10.1088/0266-5611/18/6/319
Publikováno v:
Inverse Problems. 17:1597-1610
This paper reports results obtained by linear and nonlinear iterative scalar inversion of experimental electromagnetic scattering data sets for different targets. The applied inversion schemes are a linear diffraction tomography algorithm and three n
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::712b47ef336c285caa1fb99137413b4f
https://doi.org/10.1088/0266-5611/17/6/304
https://doi.org/10.1088/0266-5611/17/6/304
Autor:
K. J. Langenberg, Ludger Klinkenbusch
Publikováno v:
2013 International Conference on Electromagnetics in Advanced Applications (ICEAA).
A particular goal of ultrasonic nondestructive testing comprises the identification of cracks, for instance, in welds. Set as an inverse scattering problem for elastic waves in solids it is essentially the crack tip scattering that delivers informati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::68aff7e43bfe307f5482f5a45955b003
https://doi.org/10.1109/iceaa.2013.6632190
https://doi.org/10.1109/iceaa.2013.6632190
Electromagnetic and elastodynamic point source excitation of unbounded homogeneous anisotropic media
Publikováno v:
Radio Science. 31:1919-1930
Plane electromagnetic as well as plane elastodynamic waves in anisotropic media exhibit a different direction of their phase and energy propagation, resulting in slowness and group velocity surfaces. Of course, the availability of plane wave solution
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1bd967f9d6de817a59dc8f5107cda428
https://doi.org/10.1029/96rs02155
https://doi.org/10.1029/96rs02155
Publikováno v:
Nuclear Engineering and Design. 157:245-255
Before carrying out inspections on technical components, criteria have to be met to qualify the inspection procedure. The inspection qualification can be performed by technical justification or performance demonstration. The qualification of non-dest
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::72e1fd627a5b310350283073c986f625
https://doi.org/10.1016/0029-5493(95)00988-o
https://doi.org/10.1016/0029-5493(95)00988-o
Publikováno v:
AIP Conference Proceedings.
Nondestructive Evaluation (NDE) of elastic anisotropic media is very complex because of directional dependency of elastic stiffness tensor. Modeling of elastic waves in such materials gives us intuitive knowledge about the propagation and scattering
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4c7491d4c03f04b0a8c562c52b6dba52
https://doi.org/10.1063/1.3703233
https://doi.org/10.1063/1.3703233
Autor:
K. J. Langenberg
Publikováno v:
2011 International Conference on Electromagnetics in Advanced Applications.
Waves creeping around a non-penetrable circular cylinder are calculated in the time domain with Finite Differences, and related to the analytical expressions obtained in the literature.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a626ec461dec6fbb5f0ee6f4b46a3884
https://doi.org/10.1109/iceaa.2011.6046391
https://doi.org/10.1109/iceaa.2011.6046391
Publikováno v:
2010 URSI International Symposium on Electromagnetic Theory.
As for electromagnetic waves the energy velocity for time harmonic elastic waves is defined by the ratio of the (real part) of the elastodynamic complex Poynting vector and their time-averaged elastic energy density. For time harmonic plane waves in
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::06eb039b5f8e4c016b6d3bd2dedb114b
https://doi.org/10.1109/ursi-emts.2010.5637253
https://doi.org/10.1109/ursi-emts.2010.5637253