Results 21 to 30 of about 57,276 (313)

Penalty methods for a variational quantum eigensolver

Physical Review Research, 2021
The variational quantum eigensolver (VQE) is a promising algorithm to compute eigenstates and eigenenergies of a given quantum system that can be performed on a near-term quantum computer.
Kohdai Kuroiwa, Yuya O. Nakagawa
doaj   +1 more source

Variational subspace methods and application to improving variational Monte Carlo dynamics [PDF]

Quantum
We present a formalism that allows for the direct manipulation and optimization of subspaces, circumventing the need to optimize individual states when using subspace methods.
Adrien Kahn, Luca Gravina, Filippo Vicentini   +2 more
doaj   +1 more source

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

Variational Integrators [PDF]

, 2004
Variational integrators are a class of discretizations for mechanical systems which are derived by discretizing Hamilton's principle of stationary action.
West, Matthew
core   +1 more source

Variational Methods in Surface Parameterization [PDF]

, 2005
A surface parameterization is a function that maps coordinates in a 2-dimensional parameter space to points on a surface. This thesis investigates two kinds of parameterizations for surfaces that are disc-like in shape.
Litke, Nathan Jacob
core   +1 more source

On a variation of Sands′ method [PDF]

International Journal of Mathematics and Mathematical Sciences, 1986
A subset of a finite additive abelian group G is a Z‐set if for all a ∈ G, na ∈ G for all n ∈ Z. The group G is called “Z‐good” if in every factorization G = A ⊕ B, where A and B are Z‐sets at least one factor is periodic. Otherwise G is called “Z‐bad.”The purpose of this paper is to investigate factorizations of finite ablian groups which arise from a
openaire   +3 more sources

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 Time Integrators in Computational Solid Mechanics [PDF]

, 2003
This thesis develops the theory and implementation of variational integrators for computational solid mechanics problems, and to some extent, for fluid mechanics problems as well.
Lew, Adrián José
core   +1 more source

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