Results 1 to 10 of about 28,735,040 (303)
Stability Analysis of a Strongly Displacement Time-Delayed Duffing Oscillator Using Multiple Scales Homotopy Perturbation Method [PDF]
Journal of Applied and Computational Mechanics, 2018 In the present study, some perturbation methods are applied to Duffing equations having a displacement time-delayed variable to study the stability of such systems.
Yusry El-Dib
doaj +3 more sources
Multiple time scales method for a two dimensional system with distributed delays
Annals of the West University of Timisoara: Mathematics and Computer ScienceBuilding on the simplified mathematical model derived from the dynamics of the hypothalamic-pituitary-adrenal (HPA) axis, which describes the interactions between ACTH and cortisol through a system of differential equations with distributed delays, this ...
Matei Maria Roxana
doaj +3 more sources
Approximate Solutions of Coupled Nonlinear Oscillations: Stability Analysis [PDF]
Journal of Applied and Computational Mechanics, 2021 The current article is concerned with a comprehensive investigation in achieving approximate solutions of coupled nonlinear oscillations with high nonlinearity. These equations are highly nonlinear second-order ordinary differential equations.
Galal M. Moatimid +2 more
doaj +1 more source
Dynamic Analysis of a COVID-19 Vaccination Model with a Positive Feedback Mechanism and Time-Delay
Mathematics, 2022 As the novel coronavirus pandemic has spread globally since 2019, most countries in the world are conducting vaccination campaigns. First, based on the traditional SIR infectious disease model, we introduce a positive feedback mechanism associated with ...
Xin Ai, Xinyu Liu, Yuting Ding, Han Li
doaj +1 more source
Analyzing Frequency response of nano electro mechanical-resonator based on non-local elasticity theory [PDF]
مجله مدل سازی در مهندسی, 2017 Â In recent years, many experimental observations showed that by decreasing the micro- and nano-beams thicknesses size effect appears and classical continuum theory cannot be used for micro- and nano-beams modeling.
mehdi maleki +2 more
doaj +1 more source
Mathematics, 2022 Global warming has brought about enormous damage, therefore, some scholars have begun to conduct in-depth research on peak carbon dioxide emissions and carbon neutrality.
Leilei Han, Haokun Sui, Yuting Ding
doaj +1 more source
Method of multiple scales with three time scales [PDF]
PAMM, 2007 AbstractSome confusion appears in the literature regarding the extension of the method of multiple scales to three or more time scales. While the work of Murdock and Wang [1] correctly indicates some obstructions to such an extension in some types of problems, other work suggests that the extension should almost never be possible [2]. These pessimistic
Peter Kramer +3 more
openaire +1 more source
Nonlinear vibration analysis of axially moving strings in thermal environment [PDF]
Journal of Theoretical and Applied Vibration and Acoustics, 2018 In this study, nonlinear vibration of axially moving strings in thermal environment is investigated. The vibration haracteristics of the system such as natural frequencies, time domain response and stability states are studied at different temperatures ...
Hassan Nahvi, Hosein Amani, Reza Tikani
doaj +1 more source
Modelling multiple time-scales with flexible parametric survival models
BMC Medical Research Methodology, 2022 Background There are situations when we need to model multiple time-scales in survival analysis. A usual approach in this setting would involve fitting Cox or Poisson models to a time-split dataset.
Nurgul Batyrbekova +7 more
doaj +1 more source
Remote Sensing, 2021 Monitoring vegetation net primary productivity (NPP) is very important for evaluating ecosystem health. However, the nonlinear characteristics of the vegetation NPP remain unclear in the six provinces along the Maritime Silk Road in China. In this study,
Peng Xue +4 more
doaj +1 more source