Results 141 to 150 of about 130,152 (295)
Laser &Photonics Reviews, EarlyView.This work presents a triaxially deformed photonic crystal cavity on the SOI substrate, enabling the localization and resonating of photons via pseudomagnetic fields. Through coupling with Si waveguides and leveraging the thermo‐optic effect, electrically tunable pseudo‐magnetism‐induced optical resonances can be achieved in the photonic integrated ...
Zhipeng Qi +9 more
wiley +1 more source
Spectral stability of undercompressive shock profile solutions of a modified KdV-Burgers equation
Electronic Journal of Differential Equations, 2007 It is shown that certain undercompressive shock profile solutions of the modified Korteweg-de Vries-Burgers equation $$ partial_t u + partial_x(u^3) = partial_x^3 u + alpha partial_x^2 u, quad alpha geq 0 $$ are spectrally stable when $alpha$ is ...
Jeff Dodd
doaj
Perturbation of embedded eigenvalues [PDF]
Bulletin of the American Mathematical Society, 1972 openaire +3 more sources
Movement Disorders Clinical Practice, EarlyView.Abstract Background Mild behavioral impairment (MBI) is a syndrome characterized by the later‐life onset of neuropsychiatric symptoms (NPS) and serves as a potential marker for dementia. In Parkinson's disease (PD), MBI has been associated with worse cognition, cortical atrophy, and altered connectivity.
Gabriel D. Pinilla‐Monsalve +4 more
wiley +1 more source
Finite and continuous perturbations of matrix eigenvalues
Applied Mathematics Letters, 1998 AbstractAn elementary proof is given that some well-known formulae for derivatives of eigenvalues of matrix-valued functions hold under weaker hypotheses than are required by the usual proofs. The relationship between continuous and finite perturbations is also discussed.
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DIM: A diffusion instability measure for MRI quality assurance
Magnetic Resonance in Medicine, EarlyView.Abstract Purpose The aim of the presented work is to develop a diffusion instability measure (DIM) that can be used in quality assurance. Methods Single‐shot, spin‐echo, echo‐planar imaging HARDI diffusion data sets were collected on a spherical silicone oil phantom with 64 different diffusion directions on a 3T Philips Achieva and a 3T Siemens Cima.X ...
Tim Schmidt, Zoltan Nagy
wiley +1 more source
, 2016 We present a complete analysis on energy and wave function of Harmonic oscillator with simultaneous non-hermitian transformation of co-ordinate ($(x \rightarrow \frac{(x+ i\lambda p)}{\sqrt{(1+\beta \lambda)}}$ and momentum $(p \rightarrow \frac{(p+ i ...
Mallick, P., Rath, Biswanath
core
International Journal of Mechanical System Dynamics, EarlyView.ABSTRACT The supercritical drive shaft is becoming increasingly popular in helicopter transmission system. Dry friction dampers are specially employed to ensure the supercritical shafts crossing the critical speed safely. Due to design tolerances, manufacturing errors and time‐varying factors, the parameters of the damper are inherently uncertain ...
Liyao Song +4 more
wiley +1 more source
Existence and perturbation of principal eigenvalues for a periodic-parabolic problem
Electronic Journal of Differential Equations, 2000 We give a necessary and sufficient condition for the existence of a positive principal eigenvalue for a periodic-parabolic problem with indefinite weight function.
Daniel Daners
doaj
Determination of eigenvalues by divergent perturbation series
Advances in Mathematics, 1971 We study eigenvalue problems for operators H0 + βV, where the perturbation series is finite order by order but divergent for any β. We prove that, under suitable conditions, the series nevertheless determines the level uniquely [and is not merely asymptotic] because some control of the remainder term, RN, uniform in N is present; in fact, for β real ...
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