Results 1 to 10 of about 29,843 (265)

The Principle of Covariance and the Hamiltonian Formulation of General Relativity

open access: yesEntropy, 2021
The implications of the general covariance principle for the establishment of a Hamiltonian variational formulation of classical General Relativity are addressed.
Massimo Tessarotto, Claudio Cremaschini
doaj   +1 more source

Variational homotopy perturbation method for solving systems of homogeneous linear and nonlinear partial differential equations

open access: yesDesimal, 2021
The variational homotopy perturbation method is developed by combining variational iteration method and homotopy perturbation method. Variational iteration method has an efficient process in solving a wide variety of equations and systems of equations ...
Atika Faradilla   +3 more
doaj   +1 more source

Optimal Control of Differential Inclusions, II: Sweeping

open access: yesИзвестия Иркутского государственного университета: Серия "Математика", 2020
This paper is devoted to optimal control of dynamical systems governed by differential inclusions with discontinuous velocity mappings. This framework mostly concerns a new class of optimal control problems described by various versions of the socalled ...
B.S. Mordukhovich
doaj   +1 more source

Multistep variational data assimilation: important issues and a spectral approach

open access: yesTellus: Series A, Dynamic Meteorology and Oceanography, 2016
In this paper, two important issues are raised for multistep variational data assimilation in which broadly distributed coarse-resolution observations are analysed in the first step, and then locally distributed high-resolution observations are analysed ...
Qin Xu   +5 more
doaj   +1 more source

Optimal Control of Differential Inclusions, I: Lipschitzian case

open access: yesИзвестия Иркутского государственного университета: Серия "Математика", 2019
We develop the method of discrete approximations to study optimal control problems for differential inclusions by using advanced tools of variational analysis and generalized differentiation.
B.S. Mordukhovich
doaj   +1 more source

An Adaptive Variational Mode Decomposition Technique with Differential Evolution Algorithm and Its Application Analysis

open access: yesShock and Vibration, 2021
Variational mode decomposition is an adaptive nonrecursive signal decomposition and time-frequency distribution estimation method. The improper selection of the decomposition number will cause under decomposition or over decomposition, and the improper ...
Yuanxin Wang
doaj   +1 more source

Comments on “Wind Gust Detection and Impact Prediction for Wind Turbines”

open access: yesRemote Sensing, 2018
We refute statements in “Zhou, K., et al. Wind gust detection and impact prediction for wind turbines. Remote Sens. 2018, 10, 514.” about the impracticality of motion estimation methods to derive two-component vector wind fields from single ...
Shane D. Mayor, Pierre Dérian
doaj   +1 more source

Variation analysis of the labor market in administrative-territorial formations of the Orenburg region 

open access: yesИнтеллект. Инновации. Инвестиции, 2019
In modern conditions of modernization of the Russian economy, transformations are also taking place in the employment system. The formation of regional labor markets is one of the main directions of this process.
V.B. Kondusova, V.A. Bakhina
doaj   +1 more source

Representation Learning via Quantum Neural Tangent Kernels

open access: yesPRX Quantum, 2022
Variational quantum circuits are used in quantum machine learning and variational quantum simulation tasks. Designing good variational circuits or predicting how well they perform for given learning or optimization tasks is still unclear. Here we discuss
Junyu Liu   +4 more
doaj   +1 more source

An Optimal Control Problem Governed by a Kirchhoff-Type Variational Inequality

open access: yesJournal of Applied Mathematics, 2020
This paper is concerned with an optimal control problem governed by a Kirchhoff-type variational inequality. The existence of multiplicity solutions for the Kirchhoff-type variational inequality is established by using some nonlinear analysis techniques ...
Chengfu Wang, Pengcheng Wu, Yuying Zhou
doaj   +1 more source

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