Results 101 to 110 of about 166,550 (244)

A robust and efficient implementation of LOBPCG

, 2018
Locally Optimal Block Preconditioned Conjugate Gradient (LOBPCG) is widely used to compute eigenvalues of large sparse symmetric matrices. The algorithm can suffer from numerical instability if it is not implemented with care.
Duersch, Jed A., Gu, Ming, Shao, Meiyue, Yang, Chao   +3 more
core   +1 more source

Vibration of cylindrical shells with embedded annular acoustic black holes using the Rayleigh-Ritz method with Gaussian basis functions

Mechanical systems and signal processing, 2021
Jie Deng, O. Guasch, L. Maxit, Ling Zheng   +3 more
semanticscholar   +1 more source

Localization transition of random copolymers at interfaces

, 1999
We consider adsorption of random copolymer chains onto an interface within the model of Garel et al. Europhysics Letters 8, 9 (1989). By using the replica method the adsorption of the copolymer at the interface is mapped onto the problem of finding the ...
A. Sali, A. V. Dobrynin, C. de Dominicis, C. de Dominicis, C. Yeung, C.-A. Dai, C.-A. Dai, H. R. Brown, H. R. Brown, Igor Ya. Erukhimovich, J. Bryngelson, J. M. Cornwall, J. Noolandi, J.-U. Sommer, J.-U. Sommer, Jens-Uwe Sommer, K. Char, L. D. Landau, M. Karplus, P. G. de Gennes, R. I. Hancock, S. F. Edwards, S. Milner, Semjon Stepanow, T. Garel   +24 more
core   +1 more source

Eigenfunction Convergence of the Rayleigh-Ritz-Meirovitch Method and the FEM

Shock and Vibration, 2007
Eigenfunction convergence characteristics of the finite element method and the Rayleigh-Ritz method with quasicomparison functions (RRMM) are compared. The RRMM has previously proved to be superior in comparing eigenvalue convergence characteristics. The
C.A. Morales, R. Goncalves
doaj   +1 more source

Turbulence Fluctuations and New Universal Realizability Conditions in Modelling

, 1996
General turbulent mean statistics are shown to be characterized by a variational principle. The variational functionals, or ``effective actions'', have experimental consequences for turbulence fluctuations and are subject to realizability conditions of ...
A. Juneja, D. C. Haworth, E. Lorenz, Francis J. Alexander, G. Comte-Bellot, G. L. Eyink, G. L. Eyink, Gregory L. Eyink, H. Chen, I. Proudman, L. Onsager, L. Onsager, R. H. Kraichnan, R. H. Kraichnan, R. H. Kraichnan, S. A. Orszag, S. B. Pope, T. Gotoh, W. C. Reynolds, Y. Kimura   +19 more
core   +1 more source

Rayleigh-Ritz Majorization Error Bounds for the Linear Response Eigenvalue Problem

Open Mathematics, 2019
In the linear response eigenvalue problem arising from computational quantum chemistry and physics, one needs to compute a few of smallest positive eigenvalues together with the corresponding eigenvectors.
Teng Zhongming, Zhong Hong-Xiu
doaj   +1 more source

Large scale ab initio calculations based on three levels of parallelization

, 2007
We suggest and implement a parallelization scheme based on an efficient multiband eigenvalue solver, called the locally optimal block preconditioned conjugate gradient LOBPCG method, and using an optimized three-dimensional (3D) fast Fourier transform ...
Andrew Knyazev, Blöchl, Brommer, Bylander, Cricchio, Davidson, Dulub, François Bottin, Gilles Zérah, Goedecker, Gonze, Hohenberg, Hutter, Hutter, Knyazev, Knyazev, Knyazev, Knyazev, Knyazev, Kohn, Kresse, Kresse, Kresse, Lanczos, Ogitsu, Payne, Pulay, Segeva, Skylaris, Skylaris, Stéphane Leroux, Sugino, Teter, Vadali, Vanderbilt, Wang, Wood, Yang, Zhou   +38 more
core   +2 more sources

Free Vibration Analysis of Cylindrical Shell from Fiberglass with Navier Boundary Conditions

Механика машин, механизмов и материалов, 2011
The analytical solution of approximate natural frequencies for the free vibration of cylindrical shells of GFRP (glass fiber reinforced plastic) with Navier boundary conditions is presented using the Rayleigh-Ritz method, while the winding angle varies ...
S.M. Bosiakov , W. Zhiwei
doaj  

INFLUENCE OF THE LENGHTS RATIO TO THE STATIC ANSWER IN THE MOVEMENT OF A ROAD DECK [PDF]

Fiabilitate şi Durabilitate, 2017
The article presents a method to obtaining the static response bridge-vehicle system in displacements,and the influence of the lengths ratio of the deck bridge on this response.
Ovidiu GAVRIŞ
doaj  

On the problem of modeling for parameter identification in distributed structures [PDF]

Structures are often characterized by parameters, such as mass and stiffness, that are spatially distributed. Parameter identification of distributed structures is subject to many of the difficulties involved in the modeling problem, and the choice of ...
Meirovitch, Leonard, Norris, Mark A.
core   +1 more source