Results 121 to 130 of about 136,518 (295)
Design of cooling structure improvement of hybrid commutated converter valve
High Voltage, EarlyView.Abstract This paper presents a thermal management framework for 120 kV hybrid commutated converter (HCC) valves, addressing critical cooling challenges in multi‐hundred‐MW power conversion systems. Power loss calculations under rated (1.0 p.u.) and overload (1.2 p.u.) conditions demonstrate that HCC valves achieve comparable loss levels to line ...
Xu He +7 more
wiley +1 more source
Stability Conditions for Perturbed Semigroups on a Hilbert Space via Commutators
Communications in Advanced Mathematical Sciences, 2019 Let $A$ and $B$ be linear operators on a Hilbert space. Let $A$ and $A+B$ generate $C_0$-semigroups $e^{tA}$ and $e^{t(A+B)}$, respectively, and $e^{tA}$ be exponentially stable.
Michael Gil'
doaj +1 more source
Commutator estimates on contact manifolds and applications
, 2015 This article studies sharp norm estimates for the commutator of pseudo-differential operators with multiplication operators on closed Heisenberg manifolds.
Gimperlein, Heiko, Goffeng, Magnus
core
Information and Computation, 1987 AbstractWe extend the notion of partial commutation by introducing that of semi-commutation which is its non-symetrical version. A semi-commutation function f is associated to a semi-Thue system 〈X, P〉 where the rules are of the form yx → xy with x, y ϵ X. We study this operation in connection with rational operations.
M. Latteux, M. Clerbout
openaire +2 more sources
Graph structure of commuting functions [PDF]
arXiv, 2014 The problem of finding graph structure of functions commuting with a given function in terms of their functional graphs is considered. Structure of functional graphs of commuting functions is described. The problem is reduced to describing graph homomorphisms of weakly connected components of functional graphs.
arxiv
Universal elements of unitriangular matrices groups
Қарағанды университетінің хабаршысы. Математика сериясы, 2017 The following theorems are proved for a matrix g from the group of unitriangular matrices over a commutative and associative ring K of finite dimension of greater than three with unity: 1) if the matrix g is universal then all of its elements are on the
A.A. Konyrkhanova, N.G. Khisamiev
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Spanning Multi‐Asset Payoffs With ReLUs
Mathematical Finance, EarlyView.ABSTRACT We propose a distributional formulation of the spanning problem of a multi‐asset payoff by vanilla basket options. This problem is shown to have a unique solution if and only if the payoff function is even and absolutely homogeneous, and we establish a Fourier‐based formula to calculate the solution.
Sébastien Bossu +2 more
wiley +1 more source
Theory of Speed and Power Factor Control of Large Induction Motors by Neutralized Polyphase Alternating-Current Commutator Machines [PDF]
, 1920 John I. Hull
openalex +1 more source
Journal of Pure and Applied AlgebraLet $KQ$ be a path algebra, where $Q$ is a finite quiver and $K$ is a field. We study $KQ/C$ where $C$ is the two-sided ideal in $KQ$ generated by all differences of parallel paths in $Q$. We show that $KQ/C$ is always finite dimensional and its global dimension is finite.
Edward L. Green, Sibylle Schroll
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Where Mathematical Symbols Come From
Topics in Cognitive Science, EarlyView.Abstract There is a sense in which the symbols used in mathematical expressions and formulas are arbitrary. After all, arithmetic would be no different if we would replace the symbols ‘+$+$’ or ‘8’ by different symbols. Nevertheless, the shape of many mathematical symbols is in fact well motivated in practice.
Dirk Schlimm
wiley +1 more source