Results 11 to 20 of about 68,128 (277)

Short-Time/-Angle Spectral Analysis for Vibration Monitoring of Bearing Failures under Variable Speed

open access: yesApplied Sciences, 2021
Vibration-condition monitoring aims to detect bearing damages of rotating machinery’s incipient failures mainly through time–frequency methods because of their efficient analysis of nonstationary signals. However, by having failures with impulse behavior,
Edgar F. Sierra-Alonso   +4 more
doaj   +1 more source

FINITE-TIME STABILITY OF NON-INSTANTANEOUS IMPULSIVE SET DIFFERENTIAL EQUATIONS

open access: yesJournal of Applied Analysis & Computation, 2023
Summary: In this paper, we investigate the finite-time stability of non-instant-aneous impulsive set differential equations. By using the generalized Gronwall inequality and a revised Lyapunov method, the finite-time stability criteria for such equations are obtained. Finally, an example is given to illustrate the validity of the results.
Wang, Peiguang, Guo, Mengyu, Bao, Junyan
openaire   +1 more source

Approximate controllability of non-instantaneous impulsive semilineartime-dependent control systems with unbounded delay and non-local condition

open access: yesNOVASINERGIA, 2022
In this work, we study the approximate controllability of a control system with unbounded delay, non-instantaneous impulse, and non-local conditions. These results prove once again that the controllability of a linear
Katherine García, Hugo Leiva
doaj   +1 more source

Global Solutions for Abstract Differential Equations with Non-Instantaneous Impulses [PDF]

open access: yesMediterranean Journal of Mathematics, 2015
The paper deals with the following problem involving a semilinear differential equation subject to the action of non-istantaneous impulses: \[ \begin{aligned} & u'(t)=Au(t)+f(t,u(t))\;,\;t\in [s_i,t_{i+1}],\, i\in \mathbb{N},\\ & u(t)=g_i(t,N_i(t)(u))\;,\;t\in (t_i,s_i],\, i\in \mathbb{N},\\ & u(0)=x_0, \end{aligned} \] where: \(A:D(A)\subseteq X\to X\)
Pierri, Michelle   +2 more
openaire   +3 more sources

A SHOCK LAYER ARISING AS THE SOURCE TERM COLLAPSES IN THE P(X)-LAPLACIAN EQUATION

open access: yesПроблемы анализа, 2020
We study the Cauchy–Dirichlet problem for the p(x)-Laplacian equation with a regular finite nonlinear minor term. The minor term depends on a small parameter ε > 0 and, as ε → 0, converges weakly* to the expression incorporating the Dirac delta function,
S. N. Antontsev   +2 more
doaj   +1 more source

Existence and multiplicity of solutions for a fourth-order differential system with instantaneous and non-instantaneous impulses

open access: yesOpen Mathematics, 2023
The main purpose is to establish the variational structure of a fourth-order ordinary differential system with both instantaneous and non-instantaneous impulses.
Xia Minggang   +2 more
doaj   +1 more source

The added mass coefficient of a dispersion of spherical gas bubbles in liquid [PDF]

open access: yes, 1989
Models published in the two-phase flow literature for the added mass coefficient of a dilute bubbly dispersion are discussed and compared. It is shown that the differences between the models are mainly due to the different ways in which the added mass is
Biesheuvel, A., Spoelstra, S.
core   +2 more sources

Nonlocal Impulsive Fractional Integral Boundary Value Problem for (ρk,ϕk)-Hilfer Fractional Integro-Differential Equations

open access: yesMathematics, 2022
In this paper, we establish the existence and stability results for the (ρk,ϕk)-Hilfer fractional integro-differential equations under instantaneous impulse with non-local multi-point fractional integral boundary conditions. We achieve the formulation of
Marisa Kaewsuwan   +5 more
doaj   +1 more source

Simulating the Kibble-Zurek mechanism of the Ising model with a superconducting qubit system [PDF]

open access: yes, 2016
The Kibble-Zurek mechanism (KZM) predicts the density of topological defects produced in the dynamical processes of phase transitions in systems ranging from cosmology to condensed matter and quantum materials.
Fan, Yunyi   +13 more
core   +2 more sources

Continuous Dependence of Solutions of Integer and Fractional Order Non-Instantaneous Impulsive Equations with Random Impulsive and Junction Points

open access: yesMathematics, 2019
This paper gives continuous dependence results for solutions of integer and fractional order, non-instantaneous impulsive differential equations with random impulse and junction points.
Yu Chen, JinRong Wang
doaj   +1 more source

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