Results 101 to 110 of about 65,693 (292)

Persistency of excitation for uniform convergence in nonlinear control systems

, 2003
In previous papers we have introduced a sufficient condition for uniform attractivity of the origin for a class of nonlinear time-varying systems which is stated in terms of persistency of excitation (PE), a concept well known in the adaptive control and systems identification literature.
Loria, Antonio, Panteley, Elena, Popovic, Dobrivoje, Teel, Andrew R.   +3 more
openaire   +2 more sources

Microstructural Evolution and Vacancy Defect Formation in Mn–Mo–Ni RPV Steel Under Low Cycle Fatigue: Insights From EBSD and PALS

Advanced Engineering Materials, EarlyView.
Low‐cycle fatigue damage in Mn–Mo–Ni reactor pressure vessel steel is examined using a combined electron backscatter diffraction and positron annihilation lifetime spectroscopy approach. The study correlates texture evolution, dislocation substructure development, and vacancy‐type defect formation across uniform, necked, and fracture regions, providing
Apu Sarkar, Dhanadeep Dutta, G. Bharat Reddy   +2 more
wiley   +1 more source

ESTIMATION OF A SEMIPARAMETRICIGARCH(1,1) MODEL [PDF]

We propose a semiparametric IGARCH model that allows for persistence invariance but also allows for more flexible functional form. We assume that thedifference of the squared process is weakly stationary.
Woocheol Kim, Oliver Linton
core  

Sufficient and necessary conditions of stochastic permanence and extinction for stochastic logistic populations under regime switching

, 2011
In this paper, we prove that a stochastic logistic population under regime switching controlled by a Markov chain is either stochastically permanent or extinctive, and we obtain the sufficient and necessary conditions for stochastic permanence and ...
Li, Xiaoyue, Jiang, Daqing, Mao, Xuerong, Gray, Alison, Xiaoyue Li, Alison Gray, Xuerong Mao, Daqing Jiang   +7 more
core   +1 more source

An age-structured within-host HIV-1 infection model with virus-to-cell and cell-to-cell transmissions

Journal of Biological Dynamics, 2018
In this paper, a within-host HIV-1 infection model with virus-to-cell and direct cell-to-cell transmission and explicit age-since-infection structure for infected cells is investigated. It is shown that the model demonstrates a global threshold dynamics,
Rui Xu, Xiaohong Tian, Shihua Zhang
doaj   +1 more source

Nonuniform Staggered Prices and Output Persistence [PDF]

Journal of Money, Credit and Banking, 2013
Staggered prices are a fundamental building block of New Keynesian dynamic stochastic general equilibrium models. In the standard model, prices are uniformly staggered, but recent empirical evidence suggests that deviations from uniform staggering are common.
openaire   +3 more sources

Powder Optimization Strategies for Binder Jetting Printing of BaTiO3 and Ba0,6Sr0,4TiO3 Ceramics

Advanced Engineering Materials, EarlyView.
Powder optimization is investigated to enable binder jetting of BaTiO3 and Ba0.6Sr0.4TiO3 ferroelectric ceramics. The antagonistic relationship between flowability and binder compatibility is addressed through binder impregnation of granulated powders and fumed silica addition to fine powders.
Fanny Pruvost, Lionel Presmanes, Soléna Colin, Marie Vidal, Sophie Guillemet‐Fritsch   +4 more
wiley   +1 more source

Stochastic population dynamics under regime switching II

, 2007
This is a continuation of our paper [Q. Luo, X. Mao, Stochastic population dynamics under regime switching, J. Math. Anal. Appl. 334 (2007) 69-84] on stochastic population dynamics under regime switching.
, Edinburgh Mathematical Society (Funder), , London Mathematical Society (Funder), Mao, X., Luo, Qi, Luo, Q., Mao, Xuerong, National Natural Science Foundation of China (Funder), Edinburgh Mathematical Society (Funder), , National Natural Science Foundation of China (Funder), London Mathematical Society (Funder), , EPSRC (UK) (Funder), EPSRC (UK) (Funder)   +11 more
core   +1 more source

Global dynamics of a degenerate reaction-diffusion cholera model with phage-bacteria interaction in a heterogeneous environment

European Journal of Applied Mathematics
To investigate multiple effects of the interaction between V. cholerae and phage on cholera transmission, we propose a degenerate reaction-diffusion model with different dispersal rates, which incorporates a short-lived hyperinfectious (HI vibrios) state
Wei Wang, Teng Liu, Hao Wang
doaj   +1 more source

Uniform Persistence in Nonautonomous Delay Differential Kolmogorov-Type Population Models

Rocky Mountain Journal of Mathematics, 1993
The paper presents a result of uniform persistence for a system of two time-dependent delay differential equations with a bounded delay: \[ dx/dt= x(t) f(t,x_ t, y_ t); \qquad dy/dt= g(t, x_ t, y_ t). \] Both competition and predator-prey conditions are considered.
Kuang, Yang, Tang, Baorong
openaire   +2 more sources