The nonpopulation conserving SIR (SIR-NC) model to describe the spread of infections in a community is studied. Unlike standard model, this does not assume population conservation. Although similar form SIR, SIR-NC admits closed solution while allowing us mortality and also provides different, arguably more realistic, interpretation parameters. Numerical comparisons with standard, conserving, a...

در این تحقیق به مقایسه تحلیلی و عددی آبشار جریان برگشتی مدل R با آبشارهای Q QI سیستم‌­های چندجزیی پایدار پرداخته می‌­شود. راستا برای اولین بار کدهای جهت طراحی منظور کد نرم‌افزار متلب نوشته شده‌­اند. نتایج نشان می‌­دهد که دو جزء 1k 2k از خوراک Nc جزء، تعداد معدودی قابل تعریف است همگی حالات خاصی می­‌باشد. هم‌­چنین یافته‌­ها مجموع مقدار برش جزیی همیشه برابر یک است. طریق داده می‌­شود صورتی میانگین ...

Our paper presents three new classes of models: SIR-PH, SIR-PH-FA, and SIR-PH-IA, states two problems we would like to solve about them. Recall that deterministic mathematical epidemiology has one basic general law, the “R0 alternative” Van den Driessche Watmough, which local stability condition disease-free equilibrium may be expressed as R0<1, where R0 is famous reproduction number, also p...

OBJECTIVES To evaluate the risk of second primary cancers in patients with major salivary gland cancer using a large population database and to examine the effects of sex, salivary gland cancer histology, and radiation therapy on the risk of second primaries. STUDY DESIGN Population-based study using the Surveillance, Epidemiology, and End Result (SEER) cancer database. SUBJECT AND METHODS ...

THE youngest, but one, of eight children of an Ayrshire farmer, Alexander Fleming was born at Lochfield Farm, near Darvel, on 6th August, 1881. He received his first schooling at Loudoun Moor School and at the age of 10 he went to the village school at Darvel; two years later he continued his education at Kilmarnock Academy. At 14 years of age he joined an elder brother in London and attended t...