Results 11 to 20 of about 287,859 (234)

To what extent is your data assimilation scheme designed to find the posterior mean, the posterior mode or something else?

Tellus: Series A, Dynamic Meteorology and Oceanography, 2016
Recently there has been a surge in interest in coupling ensemble-based data assimilation methods with variational methods (commonly referred to as 4DVar).
Daniel Hodyss, Craig H. Bishop, Matthias Morzfeld   +2 more
doaj   +1 more source

Modeling Variational Inpainting Methods With Splines

Frontiers in Applied Mathematics and Statistics, 2019
Mathematical methods of image inpainting often involve the discretization of a given continuous model. Typically, this is done by a pointwise discretization.
Florian Boßmann, Tomas Sauer, Nada Sissouno   +2 more
doaj   +1 more source

Variational Methods for Atoms and the Virial Theorem

Atoms, 2022
In the case of the one-electron Dirac equation with a point nucleus, the virial theorem (VT) states that the ratio of the kinetic energy to potential energy is exactly −1, a ratio that can be an independent test of the accuracy of a computed solution ...
Charlotte Froese Fischer, Michel Godefroid   +1 more
doaj   +1 more source

Variational integrators, the Newmark scheme, and dissipative systems [PDF]

, 1999
Variational methods are a class of symplectic-momentum integrators for ODEs. Using these schemes, it is shown that the classical Newmark algorithm is structure preserving in a non-obvious way, thus explaining the observed numerical behavior ...
Kane, C., Marsden, J. E., Ortiz, M., West, M.   +3 more
core   +2 more sources

Off-The-Grid Variational Sparse Spike Recovery: Methods and Algorithms

Journal of Imaging, 2021
Gridless sparse spike reconstruction is a rather new research field with significant results for the super-resolution problem, where we want to retrieve fine-scale details from a noisy and filtered acquisition.
Bastien Laville, Laure Blanc-Féraud, Gilles Aubert   +2 more
doaj   +1 more source

Benchmark Test Calculation of a Four-Nucleon Bound State [PDF]

, 2001
In the past, several efficient methods have been developed to solve the Schroedinger equation for four-nucleon bound states accurately. These are the Faddeev-Yakubovsky, the coupled-rearrangement-channel Gaussian-basis variational, the stochastic ...
A. Kievsky, A. Kievsky, A. Kievsky, A. Kievsky, A. Kievsky, A. Kievsky, A. Nogga, A. Nogga, A. Nogga, A. Novoselsky, A. Novoselsky, A. Stadler, A.R. Picklesimer, A.S. Jensen, B. R. Barrett, B.S. Pudliner, C.R. Chen, C.R. Chen, Ch. Elster, E. Hiyama, E. Hiyama, E. Hiyama, E. Hiyama, G. Orlandini, H. Kamada, H. Kamada, H. Kameyama, I. Fachruddin, J. Avery, J. Carlson, J. Carlson, J. Carlson, J. Usukura, J. Usukura, J.L. Friar, J.L. Friar, J.L. Friar, K. Suzuki, K. Varga, K. Varga, K. Varga, M. Fabre de la Ripelle, M. Kamimura, M. Kamimura, M. Kamimura, M. Viviani, M. Viviani, M. Viviani, N. Barnea, N. Barnea, N. Barnea, N. Barnea, N. Barnea, O. Yakubovsky, P. Navrátil, P. Navrátil, P. Navrátil, P. Navrátil, P. Navrátil, P. Navrátil, P.U. Sauer, R. B. Wiringa, R. Krivec, R. Machleidt, R.B. Wiringa, R.B. Wiringa, S. Rosati, Steven C. Pieper, T. Sasakawa, V.D. Efros, V.D. Efros, V.D. Efros, V.G.J. Stoks, W. Glöckle, W. Glöckle, W. Glöckle, W. Glöckle, W. Leidemann, W. Schadow, Y. Kino, Y. Kino, Y. Koike, Y. Suzuki, Y. Suzuki   +83 more
core   +3 more sources

Discrete Hamiltonian Variational Integrators [PDF]

, 2010
We consider the continuous and discrete-time Hamilton's variational principle on phase space, and characterize the exact discrete Hamiltonian which provides an exact correspondence between discrete and continuous Hamiltonian mechanics.
Leok, Melvin, Zhang, Jingjing
core   +3 more sources

Some Aspects of Extended General Variational Inequalities

Abstract and Applied Analysis, 2012
Noor (“Extended general variational inequalities,” 2009, “Auxiliary principle technique for extended general variational inequalities,” 2008, “Sensitivity analysis of extended general variational inequalities,” 2009, “Projection iterative methods for ...
Muhammad Aslam Noor
doaj   +1 more source

Variational methods [PDF]

, 2015
International audienceThis contribution presents derivative-based methods for local sensitivity analysis, called Variational Sensitivity Analysis (VSA). If one defines an output called the response function, its sensitivity to inputs variations around a ...
A Griewank, A Saltelli, A Sandu, A Sandu, B Ancell, BT Hoover, C Lauvernet, C Liu, CC Wu, DG Cacuci, DM Hamby, F Sévellec, G Desroziers, J Marotzke, J Thuburn, JF Sykes, JM Lellouche, L Hascoet, M Mu, N Ayoub, O Rivière, P Heimbach, R Giering, RM Errico, S Li, SG Chen, W Castaings, X Zou, Y Zhu   +28 more
core   +4 more sources

Extended Extragradient Methods for Generalized Variational Inequalities

Journal of Applied Mathematics, 2012
We suggest a modified extragradient method for solving the generalized variational inequalities in a Banach space. We prove some strong convergence results under some mild conditions on parameters. Some special cases are also discussed.
Yonghong Yao, Yeong-Cheng Liou, Cun-Lin Li, Hui-To Lin   +3 more
doaj   +1 more source