Results 51 to 60 of about 814,209 (291)

Path Integrals in Noncommutative Quantum Mechanics

, 2003
Extension of Feynman's path integral to quantum mechanics of noncommuting spatial coordinates is considered. The corresponding formalism for noncommutative classical dynamics related to quadratic Lagrangians (Hamiltonians) is formulated.
Dragovich, Branko, Rakic, Zoran
core   +1 more source

Corporate Response to a New Environment [PDF]

, 1977
The problem of minimizing a quadratic criterion for a linear system with control constraint is considered. It is shown how the solution can be generated numerically. A DC motor and a double integrator are used as examples.
Wishard, Wm. Van Dusen
core   +3 more sources

A Q‐Learning Algorithm to Solve the Two‐Player Zero‐Sum Game Problem for Nonlinear Systems

International Journal of Adaptive Control and Signal Processing, Volume 39, Issue 3, Page 566-581, March 2025.
A Q‐learning algorithm to solve the two‐player zero‐sum game problem for nonlinear systems. ABSTRACT This paper deals with the two‐player zero‐sum game problem, which is a bounded L2$$ {L}_2 $$‐gain robust control problem. Finding an analytical solution to the complex Hamilton‐Jacobi‐Issacs (HJI) equation is a challenging task.
Afreen Islam, Anthony Siming Chen, Guido Herrmann   +2 more
wiley   +1 more source

A new approach to Ginsparg-Wilson fermions

, 2000
We expand the most general lattice Dirac operator D in a basis of simple operators. The Ginsparg-Wilson equation turns into a system of coupled quadratic equations for the expansion coefficients.
Gattringer, Christof
core   +1 more source

Revisiting Stability Criteria in Ball‐Milled High‐Entropy Alloys: Do Hume–Rothery and Thermodynamic Rules Equally Apply?

Advanced Engineering Materials, Volume 27, Issue 6, March 2025.
The stability criteria affecting the formation of high‐entropy alloys, particularly focusing in supersaturated solid solutions produced by mechanical alloying, are analyzed. Criteria based on Hume–Rothery rules are distinguished from those derived from thermodynamic relations. The formers are generally applicable to mechanically alloyed samples.
Javier S. Blázquez, Alejandro F. Manchón‐Gordón, Antonio Vidal‐Crespo, Rafael Caballero‐Flores, Jhon J. Ipus, Clara F. Conde   +5 more
wiley   +1 more source

Centers on center manifolds in a quadratic system obtained froma scalar third-order differential equation

Electronic Journal of Differential Equations, 2011
We give affirmative answers to two questions concerning the existence of centers on local center manifolds at equilibria of a quadratic system in the three dimensional space.
Warley Ferreira da Cunha, Fabio Scalco Dias, Luis Fernando Mello   +2 more
doaj  

A General System of Functional Equations Deriving From Additive, Quadratic, Cubic, and Quartic Mappings

Journal of Mathematics
In the current study, we introduce a system of functional equations (FEs) deriving from the mixed type additive–quadratic and the mixed-type cubic–quartic FEs which describes a multimixed additive–quadratic–cubic–quartic mapping.
Siriluk Donganont, Abasalt Bodaghi
doaj   +1 more source

Time-dependent density-functional theory approach to nonlinear particle-solid interactions in comparison with scattering theory

, 2004
An explicit expression for the quadratic density-response function of a many-electron system is obtained in the framework of the time-dependent density-functional theory, in terms of the linear and quadratic density-response functions of noninteracting ...
Arbo D G, Bergara A, C S Kim, del Rio Gaztelurrutia T, Echenique P M, Echenique P M, Gross E K U, Hu C D, J M Pitarke, Kittel C, Kukkonen C A, Liebsch A, Lindhard J, Nagy I, Nazarov V U Nishigaki S Pitarke J M, Nazarov V U Pitarke J M Kim C S Takada Y, Perdew J P, Pitarke J M, Pitarke J M, Salin A, Taylor J R, V U Nazarov, Y Takada   +22 more
core   +1 more source

Non-coprime quadratic systems [PDF]

Bulletin of the Australian Mathematical Society, 1996
A recent result of Huang and Reyn on quadratic systems is reformulated and given a clearer proof.
openaire   +2 more sources

Characterization of Defect Distribution in an Additively Manufactured AlSi10Mg as a Function of Processing Parameters and Correlations with Extreme Value Statistics

Advanced Engineering Materials, EarlyView.
Predicting extreme defects in additive manufacturing remains a key challenge limiting its structural reliability. This study proposes a statistical framework that integrates Extreme Value Theory with advanced process indicators to explore defect–process relationships and improve the estimation of critical defect sizes. The approach provides a basis for
Muhammad Muteeb Butt, Varma Kvvssn, Hossein Laieghi, Zia Uddin, Peyman Ansari, E. Kıvanç Sadak, Can Barış Toprak, Hüseyin Kızıl, Enrico Salvati   +8 more
wiley   +1 more source