Results 61 to 70 of about 1,078,761 (224)
Iranian Journal of Electrical and Electronic Engineering, 2022 In this paper, the problem of controlling PWM single-phase AC/DC converters is addressed. The control objectives are twofold: (i) regulating the output voltage to a selected reference value, and (ii) ensuring a unitary power factor by forcing the grid ...
Y. Mchaouar +7 more
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Mathematics, 2023 This paper investigates the observability of discrete-time two-time-scale multi-agent systems with heterogeneous features under leader–follower architecture. First, a singular perturbation difference model for the discussed system is established based on
Mengqi Gu, Guo-Ping Jiang
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From exact-WKB towards singular quantum perturbation theory
, 2003 We use exact WKB analysis to derive some concrete formulae in singular quantum perturbation theory, for Schr\"odinger eigenvalue problems on the real line with polynomial potentials of the form $(q^M + g q^N)$, where $N>M>0$ even, and $g>0$.
Voros, André
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Transition of phase response properties and singularity in the circadian limit cycle of cultured cells. [PDF]
PLoS ONE, 2017 The circadian system has been regarded as a limit cycle oscillator constructed by the integrated interaction of clock genes and proteins. Here, we investigated a mammalian circadian oscillation geometrically before and after a perturbation.
Satoshi Koinuma +4 more
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On the Green function of linear evolution equations for a region with a boundary
, 2000 We derive a closed-form expression for the Green function of linear evolution equations with the Dirichlet boundary condition for an arbitrary region, based on the singular perturbation approach to boundary problems.Comment: 9 ...
Albeverio S +19 more
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A Method to Construct Asymptotic Solutions Invariant under the Renormalization Group
, 2006 A renormalization group method with the Lie symmetry is presented for the singular perturbation problems. Asymptotic solutions are obtained as group-invariant solutions under approximate Lie group admitted by perturbed differential equations.Comment: 9 ...
Iwasa, Masatomo, Nozaki, Kazuhiro
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Random perturbations of singular spectra [PDF]
Proceedings of the American Mathematical Society, 1991 The singular parts of the self-adjoint operators T T and H = T + V H = T + V are mutually singular for "almost every" bounded perturbation V V .
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Regularization and convergence for singular perturbations [PDF]
Communications in Mathematical Physics, 1992 The authors prove a theorem in an abstract setting which is applicable to the determination of selfadjoint extensions of Schrödinger's operator when the potential is singular. Let \(A\) be a selfadjoint operator on Hilbert space \({\mathfrak h}\) and \(V\) a Hermitian operator such that for \(D\) dense in \((\text{dmn }A\cap\text{dmn }V)\), \((Vf,f ...
Neidhardt, H., Zagrebnov, V. A.
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Harmonic Maps to Buildings and Singular Perturbation Theory [PDF]
, 2013 The notion of a (uni)versal building associated with a point in the Hitchin base is introduced. The universal building is a building equipped with a harmonic map from the universal cover of the given Riemann surface that is initial among harmonic maps ...
L. Katzarkov +3 more
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Analytical Expression for Low-dimensional Resonance Island in 4-dimensional Symplectic Map
, 2005 We study a 2- and a 4-dimensional nearly integrable symplectic maps using a singular perturbation method. Resonance island structures in the 2- and 4- dimensional maps are successfully obtained.
Goto, Shin-itiro
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