Application of delay integral equations in population growth

Fadhel Subhi  Fadhel; Thekra Abdul Latiff

doi:10.21123/bsj.2009.6.2.401-404

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Publication Date

Sun Jun 07 2009

Journal Name

Baghdad Science Journal

Volume

6

Issue Number

2

DOI

10.21123/bsj.2009.6.2.401-404

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Application of delay integral equations in population growth

"delay integral equations

calculus of variation"

Fadhel Subhi Fadhel

Thekra Abdul Latiff

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In this paper, the delay integral equations in population growth will be described,discussed , studied and transfered this model to integro-differential equation. At last,we will solve this problem by using variational approach.

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Sun Jan 01 2023

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Saudi Endodontic Journal

Comparison of root canal transportation and centering after instrumentation through conservative and traditional access cavities using different file systems

Samer Abbas

Anas Falah

Ahmed Hamid

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Introduction:

While conservative access preparations could increase fracture resistance of endodontically treated teeth, it may influence the shape of the prepared root canal. The aim of this study was to compare the prepared canal transportation and centering ability after continuous rotation or reciprocation instrumentation in teeth accessed through traditional or conservative endodontic cavities by using cone-beam computed tomography (CBCT).

Materials and Methods:

Forty extracted intact, matured, and 2-rooted human maxillary first premolars were selected for this

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Thu Jan 27 2022

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Nanomaterials

Improving the Melting Duration of a PV/PCM System Integrated with Different Metal Foam Configurations for Thermal Energy Management

Hussein

Jasim M.

Dmitry

Nidhal

Naif

Maria

Moram

Wahiba

Pouyan

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The melting duration in the photovoltaic/phase-change material (PV/PCM) system is a crucial parameter for thermal energy management such that its improvement can realize better energy management in respect to thermal storage capabilities, thermal conditions, and the lifespan of PV modules. An innovative and efficient technique for improving the melting duration is the inclusion of an exterior metal foam layer in the PV/PCM system. For detailed investigations of utilizing different metal foam configurations in terms of their convective heat transfer coefficients, the present paper proposes a newly developed mathematical model for the PV/PCM–metal foam assembly that can readily be implemented with a wide range of operating condition

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Mon Mar 01 2021

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Journal Of Physics: Conference Series

Synthesis and study the liquid crystalline properties of new compounds containing 5-methyl-2,4-dihydro-3H-pyrazol-3-one

Omar B.

Jumbad H.

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AbstractThe new compounds of pyrazolines were synthesized from the reaction of different acid hydrazide with ethylacetoacetate and ethanol under reflux. These compounds were obtained from many sequence reactions. The 4-acetyl-5-methyl-2,4-dihydro-3H-pyrazol-3-one compounds synthesized from the reaction of 5-methyl-2,4-dihydro-3H-pyrazol-3-one with acetyl chloride in calcium hydroxide and 1,4-dioxane. Finaly, Schiff bases were prepared via condensation reaction of products of mono- and tri ketone derivatives[IV]a, b with phenyl hydrazines as presented in (Scheme 1, 2). The synthesized compounds were identification by using FTIR, NMR and Mass spectroscopy (of some of them). ... Show More

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Tue Jan 21 2025

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Applied Biochemistry And Biotechnology

Synthesis and characterization of new (Au, Ru, and Rh) ion complexes and evaluating their activity as anticancer and antioxidants

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Samara Ali

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Fri Mar 10 2017

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Superconductor Science And Technology

Conceptual designs of conduction cooled MgB2 magnets for 1.5 and 3.0 T full body MRI systems

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Abdullah

Robert J

Laith

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Robert W

Michael

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Results In Engineering

Thermodynamic modeling and performance analysis of photovoltaic-thermal collectors integrated with phase change materials: Comprehensive energy and exergy analysis

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Jasim M.

Thamir

Raad Z.

Pouyan

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Tue Jul 01 2025

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Iraqi Journal Of Scientific And Industrial Research

Surface Morphology and Elemental Analysis of Al2O3 Thin Films Prepared by DC Reactive Sputtering Technique Using Different Gas Mixtures

Haneen

Mohammed

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In this study, Al2O3 thin films were prepared by dc reactive sputtering technique using different gas mixtures of argon and oxygen gases (90:10, 70:30, 50:50, 30:70, and 10:90). These films were characterized to introduce their surface morphology and elemental composition as functions of the oxygen content in the gas mixture. The gas mixing ratio plays a crucial role in controlling the nanoscale morphology of the prepared thin films. The [Al]/[O] ratio varies non-linearly with the Ar:O2 mixing ratio. Increasing the oxygen content leads to a progressive decrease in surface roughness, resulting in smoother and more uniform films with finer granular features. These results presented herein are useful to optimize the sputtering process to ac

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Publication Date

Wed Jul 14 2021

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The Open Civil Engineering Journal

Producing Sustainable Concrete using Nano Recycled Glass

Recycled materials

Nano glass powder

Addition and replacement of cement

Emission of CO2

Flexural strengths of concrete

Raw material.

Zena

Hayder A.

Bassam A.

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Background:

Many tools and techniques have been recently adopted to develop construction materials that are less harmful and friendlier to the environment. New products can be achieved through the recycling of waste material. Thus, this study aims to use recycled glass bottles as sustainable materials.

Objective:

Our challenge is to use nano glass powder by the addition or replacement of the weight of the cement for producing concrete with enhanced strength.

Methods:

A nano recycled glass p

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(16)

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Fri Feb 01 2019

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Journal Of Physics: Conference Series

Manufacturing and studying the effect of partial substitution on the properties of the compound Bi2-x AgxSr1.9Ba0.1Ca2Cu3O10+δ superconductors.

Noor S.

Abdulsalam S.

Bilal A.

Shatha

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