doi:10.21123/bsj.2019.16.3.0639

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Publication Date

Sun Sep 01 2019

Journal Name

Baghdad Science Journal

Volume

16

Issue Number

3

DOI

10.21123/bsj.2019.16.3.0639

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An Analysis of a Partial Temporary Immunity SIR Epidemic Model with Nonlinear Treatment Rate

Nonlinear treatment rate

Partial temporary immunity

SIR epidemic model.

Majeed

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A partial temporary immunity SIR epidemic model involv nonlinear treatment rate is proposed and studied. The basic reproduction number is determined. The local and global stability of all equilibria of the model are analyzed. The conditions for occurrence of local bifurcation in the proposed epidemic model are established. Finally, numerical simulation is used to confirm our obtained analytical results and specify the control set of parameters that affect the dynamics of the model.

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Publication Date

Fri Mar 01 2013

Journal Name

Journal Of Economics And Administrative Sciences

Comparison for estimation methods for the autoregressive approximations

عملية غير انعكاسية- عمية ضوضاء متكامل نسبياً- تقريب الانحدار الذاتي- معادلات Yule- Walker- طريقة اقل المربعات- طيقة الامامية- الخلفية – طريقتي Burg.

non-invertible process

fractionally- integrated noise process

autoregressive approximation

Yule-Walker equations

Least Squares

Least Squares ( forward- backword ) and Burg’s methods.

جنان عباس

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Abstract

In this study, we compare between the autoregressive approximations (Yule-Walker equations, Least Squares , Least Squares ( forward- backword ) and Burg’s (Geometric and Harmonic ) methods, to determine the optimal approximation to the time series generated from the first - order moving Average non-invertible process, and fractionally - integrated noise process, with several values for d (d=0.15,0.25,0.35,0.45) for different sample sizes (small,median,large)for two processes . We depend on figure of merit function which proposed by author Shibata in 1980, to determine the theoretical optimal order according to min

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Publication Date

Tue Jan 18 2022

Journal Name

Materials Science Forum

The Effect of Gamma Radiation on the Manufactured HgBa2Ca2Cu2.4Ag0.6O8+δ Compound

Gamma doses radiation

crystal size

strain

degree of crystallinity

Scherrer

crystallinity and Williamson equations.

zainab j

Balqees A.

Mohammed A.

Kareem A.

Auday H.

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In this article four samples of HgBa₂Ca₂Cu_2.4Ag_0.6O_8+δ were prepared and irradiated with different doses of gamma radiation 6, 8 and 10 Mrad. The effects of gamma irradiation on structure of HgBa₂Ca₂Cu_2.4Ag_0.6O_8+δ samples were characterized using X-ray diffraction. It was concluded that there effect on structure by gamma irradiation. Scherrer, crystallization, and Williamson equations were applied based on the X-ray diffraction diagram and for all gamma doses, to calculate crystal size, strain, and degree of crystallinity. I

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Publication Date

Tue Oct 01 2013

Journal Name

Journal Of Economics And Administrative Sciences

أثـر الأدوات الداخلية لحوكمة الشركة على رأس المال الـعـامـل وانعكاسهما علـى القيـمـة الاقتصـادية المضـافـة: دراســة تطبيقيـة علـى عينــة مـــن الشـركــات الصنــاعــيــة المـدرجــة في بورصــة عـمّــان لــلأوراق المـالـيـة

/ Corporate Governance Instrument- Net Working Capital- Economic Value Added- Weighted Average Cost of Capital- Capital Asset Pricing Model

أدوات حوكمة الشركات- صافي راس المال العامل- القيمة الاقتصادية المضافة- المتوسط الموزون لكلفة راس المال- نموذج تسعير الاصول الرأسمالية.

ارشد فؤاد

احمد فارس

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Abstract

Objective of this research focused on testing the impact of internal corporate governance instruments in the management of working capital and the reflection of each of them on the Firm performance. For this purpose, four main hypotheses was formulated, the first, pointed out its results to a significant effect for each of corporate major shareholders ownership and Board of Directors size on the net working capital and their association with a positive relation. The second, explained a significant effect of net working capital on the economic value added, and their link inverse relationship, while the third, explored a significant effect for each of the corporate major shareholders ownershi

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Publication Date

Sun Oct 01 2023

Journal Name

مجلة دراسات دولية

الذكاء الاصطناعي والوجود الإنساني: قراءة فكرية في الابعاد الاجتماعية

تُعد فكرة الذكاء الاصطناعي من العلوم الحديثة

التي ارتبطت بالإنسان في العقود الخمسة الأخيرة

وأصبحت السياسة الرقمية جزءاً لا يتجزأ من المجتمع

لكونها تُستخدم في أغلب مجالات حياة الانسان. وهذا ما شجع صانعوا السياسات التكنولوجية الجديدة

في التفكير بكيفية توظيفه لخدمة مصالحهم العليا

بغض النظر عن بذل الجهود للتفكير في تنظيمه

ووضع قيود تراعي التشريعات الدينية

والقوانين

ودساتير الدول

والتقاليد والأعراف الاجتماعية. وبدأت بعض برامج الذكاء الاصطناعي تُستخدم كمنصة لمحتوى غير قانوني

وتخترق سلباً خصوصية الانسان

دون أن تحرص وتفكر الشركات في خطوات لمنع إساءة استخدام منصاتها.

ليث عصام مجيد

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Publication Date

Mon Nov 01 2010

Journal Name

Al-nahrain Journal Of Science

Chemical Elements Diffusion in the Solar Interior

The standard solar model and equation of state have been used to study relative diffusion of Hydrogen and Helium in the present time for solar interior

as a function of distance and depth from the center of the star. The effects of temperature and density on diffusion velocity for these chemical elements have been explaned. It is found that heat flow which is arising from these reactions leads to an increase in helium diffusion velocity

while the temperature and density leading to a decrease in Hydrogen diffusion velocity. This means that Hydrogen behaves inversely with that for helium does through these reactions. Accordingly

diffusion percentages for Hydrogen

Helium and other Heavy Elements could be determined for the main sequence stars and white dwarf stars.

H.

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