نتایج جستجو برای: free equilibrium state

تعداد نتایج: 1428880  

Journal: :sahand communications in mathematical analysis 0
reza akbari department of mathematical sciences, payame noor university, p.o.box 19395-3697, tehran, iran. ali vahidian kamyad department of mathematics sciences, university of ferdowsi, mashhad, iran. ali akbar heydari research center for infection control and hand hygiene, mashhad university of medical sciences, mashhad, iran. aghileh heydari department of mathematical sciences, payame noor university, p.o.box 19395-3697, tehran, iran.

in this paper we study the dynamics of hepatitis b virus (hbv) infection under administration of a vaccine and treatment, where the disease is transmitted directly from the parents to the offspring  and also through contact with infective individuals. stability of the disease-free steady state is investigated. the basic reproductive rate, $r_0$, is derived. the results show that the dynamics of...

In this paper we study the dynamics of Hepatitis B virus (HBV) infection under administration of a vaccine and treatment, where the disease is transmitted directly from the parents to the offspring  and also through contact with infective individuals. Stability of the disease-free steady state is investigated. The basic reproductive rate, $R_0$, is derived. The results show that the dynamics of...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه ولی عصر (عج) - رفسنجان - دانشکده ریاضی 1389

in this thesis, first the notion of weak mutual associativity (w.m.a.) and the necessary and sufficient condition for a $(l,gamma)$-associated hypersemigroup $(h, ast)$ derived from some family of $lesssim$-preordered semigroups to be a hypergroup, are given. second, by proving the fact that the concrete categories, semihypergroups and hypergroups have not free objects we will introduce t...

A  tuberculosis (TB) model with  lost sight  and multiple latent classes  is considered and studied. We derive the basic reproduction ratio $mathcal R_0$. There is always a globally asymptotically stable equilibrium state. Depending on the value of   $mathcal{R}_0$, this state can be either endemic ($mathcal{R}_0> 1$), or infection-free ($mathcal{R}_0leq 1$). The global asymptotic stability of ...

Journal: :The European Physical Journal B 2012

In this paper, we formulated a dynamical model of COVID-19 to describe the transmission dynamics of the disease. The well possedness of the formulated model equations was proved. Both local and global stability of the disease free equilibrium and endemic equilibrium point of the model equation was established using basic reproduction number. The results show that, if the basic reproduction numb...

Journal: :iranian journal of science and technology (sciences) 2013
n. farajzadeh tehrani

this paper is concerned with global analysis of a delay sveir epidemiological model in a population of varying size. by using lyapunov stability method and lasalle’s invariance principle for delay systems, we prove that when there is no endemic equilibrium, the disease free equilibrium is globally asymptotically stable, otherwise the endemic equilibrium is globally stable.

2005
Alexander N. Gorban Gregory S. Yablonsky

Everything that is not prohibited is permissible. So, what is prohibited in the course of chemical reactions, heat transfer and other dissipative processes? Is it possible to “overshoot” the equilibrium, and if yes, then how far? Thermodynamically allowed and prohibited trajectories of processes are discussed by the example of effects of equilibrium encircling. The complete theory of thermodyna...

A. Adnan Thirthar, R. kamel Naji,

       In this paper an SIS epidemic model with saturated incidence rate and treatment func- tion is proposed and studied. The existence of all feasible equilibrium points is discussed. The local stability conditions of the disease free equilibrium point and endemic equilibrium point are established with the help of basic reproduction number.However the global stabili- ty conditions of these eq...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی امیرکبیر(پلی تکنیک تهران) - دانشکده مهندسی شیمی 1386

محاسبات تعادلات فازی برای پیشگویی تعادلات فازی و ترکیب در حال تعادل در عملیات و فرایند های مختلف شیمیایی نقش مهمی باز می کند. همان طور که می دانیم تعادلات فازی نیاز به کمیته سازی مطلق انرژی آزاد گبیس دارد و توابع ترمودینامیکی در این گونه مساله ها به شدت غیر خطی است لذا در این پروژه، از الگوریتم ژنتیک برای این هدف استفاده شده است. در این پروژه به تعادلات مایع-مایع، مایع-بخار، مایع-مایع-بخار و ما...

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