Results 21 to 30 of about 2,202 (85)

Some Results on Bellman Equations of Optimal Production Control in a Stochastic Manufacturing System

Journal of Probability and Statistics, Volume 2009, Issue 1, 2009., 2009
The paper studies the production inventory problem of minimizing the expected discounted present value of production cost control in a manufacturing system with degenerate stochastic demand. We establish the existence of a unique solution of the Hamilton‐Jacobi‐Bellman (HJB) equations associated with this problem.
Azizul Baten, Anton Abdulbasah Kamil, Nikolaos E. Limnios   +2 more
wiley   +1 more source

A Stochastic Cobweb Dynamical Model

Discrete Dynamics in Nature and Society, Volume 2008, Issue 1, 2008., 2008
We consider the dynamics of a stochastic cobweb model with linear demand and a backward‐bending supply curve. In our model, forward‐looking expectations and backward‐looking ones are assumed, in fact we assume that the representative agent chooses the backward predictor with probability q_, __0_q_1, and the forward predictor with probability (1 − q ...
Serena Brianzoni, Cristiana Mammana, Elisabetta Michetti, Francesco Zirilli, Xue-Zhong He   +4 more
wiley   +1 more source

Open and Closed Loop Approaches for Energy Efficient Quantum Optimal Control

Advanced Quantum Technologies, Volume 8, Issue 10, October 2025.
Concepts from quantum thermodynamics and optimal control are blended to derive a theoretical framework to quantify and minimize the energetic cost of a pulse for unitary synthesis. Two complementary techniques (based on GRAPE and Reinforce‐DRL) are implemented as open‐source software that co‐optimizes the fidelity and energetic cost within quantum ...
Sebastiaan Fauquenot, Aritra Sarkar, Sebastian Feld   +2 more
wiley   +1 more source

Stochastic Hydrodynamic Velocity Field and the Representation of Langevin Equations

Annalen der Physik, Volume 537, Issue 6, June 2025.
A lumped method is proposed to account for both mean‐field hydrodynamics and stochastic fluctuations within the kinematic equations of motion, providing a regularized formulation of the overdamped approximation. The concept of stochastic realizability in broad sense is introduced based on the spectral properties of the Fredholm operator associated with
Massimiliano Giona, Davide Cocco, Giuseppe Procopio   +2 more
wiley   +1 more source

Transition from the chaotic turbulence to the turbulent structures

Discrete Dynamics in Nature and Society, Volume 3, Issue 4, Page 243-250, 1999., 1999
Weak turbulence, similar to incoherent light, may be represented as an ensemble of quasi‐free quanta or Fourier harmonics. Unlike it, strongly turbulent state should be based on nonlinear structures. In particular, strong plasma turbulence may be constructed of discrete formations, viz., Langmuir solitons.
A. Kingsep
wiley   +1 more source

Best approximation, optimal recovery, and Landau inequalities for derivatives of Hukuhara-type in function L-spaces

Journal of Applied and Numerical Optimization, 2019
We consider the problem of approximation of unbounded positively homogeneous operators in L-spaces using Lipschitz operators. We study its connection to the problem of computing modulus of continuity of the unbounded operator on the class of elements, as
V. Babenko, V. Babenko
semanticscholar   +1 more source

Physics of Ferroelectric Wurtzite Al1−xScxN Thin Films

Advanced Electronic Materials, Volume 11, Issue 2, February 2025.
This review highlights Al1−xScxN as a groundbreaking wurtzite ferroelectric with exceptional properties, including large polarization, tunable coercive field, outstanding thermal stability, and compatibility with CMOS/III‐N technologies. It explores the origins of its ferroelectricity, phase stability, and control mechanisms, discusses challenges such ...
Feng Yang
wiley   +1 more source

Numerical Investigation Into Mechanical Behavior of Metastable Olivine During Phase Transformation: Implications for Deep‐Focus Earthquakes

Journal of Geophysical Research: Solid Earth, Volume 130, Issue 2, February 2025.
Abstract One hypothesized mechanism that triggers deep‐focus earthquakes in oceanic subducting slabs below ∼300 km depth is transformational faulting due to the olivine‐to‐spinel phase transition. This study uses finite element modeling to investigate phase transformation‐induced stress redistribution and material weakening in olivine.
S. Sindhusuta, Sheng‐Wei Chi, Craig Foster, Timothy Officer, Yanbin Wang   +4 more
wiley   +1 more source