Results 91 to 100 of about 52,961 (285)

Commutativity and structure of rings with commuting nilpotents [PDF]

open access: yesInternational Journal of Mathematics and Mathematical Sciences, 1983
Let R be a ring and let N denote the set of nilpotent elements of R. Let Z denote the center of R. Suppose that (i) N is commutative, (ii) for every x in R there exists x′ϵ < x> such that x − x2x′ϵN, where <x> denotes the subring generated by x, (iii) for every x, y in R, there exists an integer n = n(x, y) ≥ 1 such that both (xy) n − (yx ...
Hazar Abu-Khuzam, Adil Yaqub
openaire   +4 more sources

Non‐Markovian Quantum Kinetic Simulations of Uniform Dense Plasmas: Mitigating the Aliasing Problem

open access: yesContributions to Plasma Physics, EarlyView.
ABSTRACT Dense quantum plasmas out of equilibrium are successfully modeled using quantum kinetic equations, such as the quantum Boltzmann, Landau, or Balescu–Lenard equation. However, these equations do not properly take into account correlation effects, which require the use of generalized non‐Markovian kinetic equations.
C. Makait, M. Bonitz
wiley   +1 more source

Canonical Commutation Relation Derived from Witt Algebra

open access: yesMathematics
From an arbitrary definition of operators inspired by oscillators of Virasoro, an algebra is derived. It fits the structure of Virasoro algebra with null central charge or Witt algebra. The resulting formalism has yielded commutators with a dependence on
Huber Nieto-Chaupis
doaj   +1 more source

Design and Simulation of an Autotransformer‐Based 18‐Pulse AC‐DC Converter for Enhanced Power Quality in Vector‐Controlled Asynchronous Motor Drives

open access: yesEnergy Science &Engineering, EarlyView.
18‐pulse AC/DC converter with T‐connected autotransformer for feeding VCAMD. ABSTRACT Reducing harmonics in alternating current (AC) input and ripples in direct current (DC) output enhances power quality, achievable through multi‐pulse converters (MPCs). This study presents the design, simulation, and analysis (in MATLAB/Simulink) of an autotransformer‐
Mohammad Yousefzadeh   +4 more
wiley   +1 more source

Bloom-type two-weight inequalities for commutators of maximal functions

open access: yesAnalysis and Geometry in Metric Spaces
We study Bloom-type two-weight inequalities for commutators of the Hardy-Littlewood maximal function and sharp maximal function. Some necessary and sufficient conditions are given to characterize the two-weight inequalities for such commutators.
Zhang Pu, Fan Di
doaj   +1 more source

Regularity in generalized Morrey spaces of solutions to higher order nondivergence elliptic equations with VMO coefficients

open access: yesElectronic Journal of Qualitative Theory of Differential Equations, 2019
We study the boundedness of the sublinear integral operators generated by Calderón–Zygmund operator and their commutators with $\mathit{BMO}$ functions on generalized Morrey spaces.
Tahir Gadjiev   +2 more
doaj   +1 more source

q-Uncertainty Relations

open access: yes, 1997
As one would anticipate from the realization of the q-commutators by difference operators, the states of maximum localization are smeared delta functions depending on q.Comment: 10 pages, tex ...
Finkelstein, Robert J.
core   +1 more source

Smart Solutions: A New Direct Current Electric Machine Design to Reduce Weight and Enhance Efficiency

open access: yesGlobal Challenges, EarlyView.
This article introduces a smart solution for the design of a brush DC motor with a winding‐free rotor (DCFR). The proposed model simplifies manufacturing, reduces material costs, and enhances efficiency. Designed for variable speed and solar power applications, the DCFR achieves 91.8% efficiency and a 21% weight reduction compared to conventional ...
Dmytro Ivliev   +5 more
wiley   +1 more source

On the Q $Q$‐Polynomial Property of Bipartite Graphs Admitting a Uniform Structure

open access: yesJournal of Combinatorial Designs, EarlyView.
ABSTRACT Let Γ ${\rm{\Gamma }}$ denote a finite, connected graph with vertex set X $X$. Fix x ∈ X $x\in X$ and let ε ≥ 3 $\varepsilon \ge 3$ denote the eccentricity of x $x$. For mutually distinct scalars { θ i * } i = 0 ε ${\{{\theta }_{i}^{* }\}}_{i=0}^{\varepsilon }$ define a diagonal matrix A * = A * ( θ 0 * , θ 1 * , … , θ ε * ) ∈ Mat X ( R ) ${A}^
Blas Fernández   +3 more
wiley   +1 more source

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