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In this paper we propose a continuous-time Markov chain to describe the spread of an infective and non-mortal disease into a community numerically limited and subjected to an external infection. We make a numerical simulation that shows tendencies for recurring epidemic outbreaks and for fade-out or extinction of the infection. 相似文献
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The equations for a barotropic viscous gas in one space dimensiondν=(μ(?νε)ε?p ε)dt+dG,? t +?2νε=0,p=?γ with a perturbationdG are considered under the assumption thatG is only a function of bounded variation inL 2(Θ) orH 0 1 (Θ) (Θ=]0, α[) and the esistence and the uniqueness of the global solution in a class of solutions of «strong type» as well as in a class of solutions of «weak type» are proved. This result constitutes a generalization of the result of Kazhikhov [8] and that of Shelukhin [10] and contains preliminary considerations for the corrisponding stochastic equations. 相似文献
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Elisabetta Tornatore Stefania Maria Buccellato Pasquale Vetro 《Rendiconti del Circolo Matematico di Palermo》2006,55(2):223-240
We propose a stochastic disease model where vaccination is included and such that the immunity isn’t permanent. The existence,
uniqueness and positivity of the solution and the stability of disease free equilibrium is studied. The numerical simulation
is done. 相似文献
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Elisabetta Tornatore 《Rendiconti del Circolo Matematico di Palermo》2003,52(1):15-29
We consider Lotka-Volterra competition model with diffusion in a territorial domain with a stochastic perturbation which represents
the random variations of environment conditions. We prove the existence, the uniqueness and the positivity of the solution.
Moreover, the stochastic boundedness of the solution is analized. 相似文献
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The use of ion mobility spectrometry systems to detect explosives in high security situations creates a need to determine compounds that interfere and may compromise accurate detection. This is the first study to identify possible interfering air contaminants common in airport settings by IMS. Seventeen suspected contaminants from four major sources were investigated. Due to the ionization selectivity gained by employing chloride reactant ion chemistry, only 7 of the 17 compounds showed an IMS response. Of those seven compounds, only 4,6-dinitro-o-cresol (4,6DNOC) was found to have a similar mobility to 2,4,6-trinitrotoluene (TNT) with K(o) values of 1.55 and 1.50 cm(2) V(-1) s(-1), respectively. Although baseline resolution between TNT and 4,6DNOC was not achieved, the drift time for TNT was still easily identified. Alkyl-nitrated phenols, due to acidic fog, responded the strongest in the IMS. The effect of contamination on TNT sensitivity was investigated. Charge competition between TNT and 2,4-dinitrophenol (2,4DNP) was found to occur and to effect TNT sensitivity. 相似文献
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The aim of this paper is to prove the existence of two solutions for a nonlinear elliptic problem involving the -Laplacian operator. The solutions are obtained by using variational methods and critical points theorems. The positivity of the solutions is shown by applying a generalized version of the strong maximum principle. 相似文献
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Elisabetta Tornatore Stefania Maria Buccellato 《Journal of Mathematical Analysis and Applications》2009,360(2):624-630
We present a stochastic delay model of an infectious disease (malaria) transmitted by a vectors (mosquitoes) after an incubation time. A criterion for limitation of disease is found. 相似文献
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Received June 1998 – Revised October 1998 相似文献