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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Publication Date

Wed Nov 22 2017

Journal Name

Environmental Toxicology And Chemistry

Factors affecting the dissipation of pharmaceuticals in freshwater sediments

Omar S.A.

Ed

Alistair B.A.

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Abstract<sec><label></label>Degradation is one of the key processes governing the impact of pharmaceuticals in the aquatic environment. Most studies on the degradation of pharmaceuticals have focused on soil and sludge, with fewer exploring persistence in aquatic sediments. We investigated the dissipation of 6 pharmaceuticals from different therapeutic classes in a range of sediment types. Dissipation of each pharmaceutical was found to follow first‐order exponential decay. Half‐lives in the sediments ranged from 9.5 (atenolol) to 78.8 (amitriptyline) d. Under sterile conditions, the persistence of pharmaceuticals was considerably longer. Stepwise multiple linear regression analysis was performed to </sec> ... Show More

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(23)

Publication Date

Sat Aug 01 2020

Journal Name

Iop Conference Series: Materials Science And Engineering

Evaluating Implementation of Electric Power Generation Projects in Iraq

Ameer A.

Kadhim R.

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AbstractIraq has witnessed development in many fields and the electricity production sector is one of the most important of these fields. This is attributed to the State’s philosophy in supporting this sector through the development of economic development projects to serve and raise the level of the Iraqi individual. Electricity production in Iraq is affected by many variables such as load growth, economic and financial conditions, planning, etc. All these led to a disparity in the production of electric power to cover the demand for energy. The paper deals with the electricity generation sector overview in Iraq, Analysis of the effects of variables on the implementation of power generatio ... Show More

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(5)

Publication Date

Tue Nov 01 2022

Journal Name

Journal Of Engineering

The Use of Lightweight Aggregate in Concrete: A Review

saad

Zena K

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One of the artificial lightweight aggregates with a wide range of applications is Lightweight Expanded Clay Aggregate. Clay is utilized in the production of light aggregates. Using leftover clay from significant infrastructure development projects to manufacture lightweight aggregates has a favorable environmental impact. This research examines the expanded clay aggregate production process and the impact of processing parameters on its physical and mechanical qualities. It also looks at secondary components that can be used to improve the qualities of concrete with expanded clay aggregates. The effect of the quantity of expanded clay aggregate on the fresh, hardened, and durability qualities of concrete is also studied.

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Publication Date

Wed Feb 01 2017

Journal Name

Physics Letters A

Wake potential of swift ion in amorphous carbon target

Nabil janan

Khalid A.

Abdullah Ibrahim

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The wake potential and wake phenomena for swift proton in an amorphous carbon target were studied by utilising various dielectric function formalisms, including the Drude dielectric function, the Drude–Lorentz dielectric function and quantum dielectric function. The Drude model results exhibited a damped oscillatory behaviour in the longitudinal direction behind the projectile; the pattern of these oscillations decreases exponentially in the transverse direction. In addition, the wake potential extends slightly ahead of the projectile which also depends on the proton coordinate and velocity. The effect of electron binding on the wake potential, characterised by the ratio to 0.1, has been studied alongside the Drude–Lorentz dielectric

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(10)

(8)

Publication Date

Thu Oct 31 2024

Journal Name

Sabrao Journal Of Breeding And Genetics

THE ROLE OF NANOTECHNOLOGY IN CROP IMPROVEMENT – A REVIEW

A.S.M.

Aws Ali

S.K.

S.H.

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(3)

Publication Date

Tue Mar 20 2018

Journal Name

Day 3 Thu, March 22, 2018

Economics of Supramolecular Assemblies as Displacement Fluids in EOR

Cost effectiveness

Efficiency

Enhanced recovery

Floods

Offshore oil well production

Offshore technology

Oil well flooding

Polymers

Reservoirs (water)

Shear stress

Supramolecular chemistry

Viscosity

Cenk

Mohamad Y.

Anas K.

Dike

Omar

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AbstractIt is estimated that over the next few decades, EOR will be used for the more than 50% of oil production in the US and worldwide. From these, in reservoir with viscositites ranging between 10 – 150 mPa.s, polymer flooding is suggsted as the EOR method. Therefore, there is an upper limit to the recommended range of reservoir oil viscosities for polymer flooding. To address the issue of this limitation of polymer injectivity and pumping efficiency, we propose a novel method. The method involves the use of Supramolecular Systems, which are composed of long-chain aminoacids and maleic acids post complexation. Their unique feature of resersible viscosities allows the operator to overcome ... Show More

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(3)

(2)

Publication Date

Sun Jun 01 2025

Journal Name

Journal Of Education And Health Promotion

Epidemiological profile of substance abuse in Iraq: Retrospective study

Nasir Muwfaq

Mahmoud Mohammed

Haider Mohammed

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BACKGROUND:

The excessive and prolonged use of any relevant material is known as substance abuse. The study’s objective is to determine the epidemiology of substance abuse’s growth in Iraq over the 4 years between 2020 and 2023.

MATERIALS AND METHODS:

A retrospective study was applied for the purpose of collecting the sample, as the study was epidemiological and related to substance abuse among Iraqis for 4 years from the beginning of 2020 to 2023. Participants’ data were collected from records that were available in the Iraqi Ministry of Health and Environment

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(2)

Publication Date

Thu Dec 15 2022

Journal Name

Al-academy

Strategies of brain-based learning theory and its impact on the achievement of students of the Department of Art Education in Teaching Methods

Strategies of Brain-Based Learning Theory) K W L) Strategy

Teaching Methods

Hussein

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The aim of the current research is to reveal the effect of using brain-based learning theory strategies on the achievement of Art Education students in the subject of Teaching Methods. The experimental design with two equal experimental and control groups was used. The experimental design with two independent and equal groups was used, and the total of the research sample was (60) male and female students, (30) male and female students represented the experimental group, and (30) male and female students represented the control group. The researcher prepared the research tool represented by the cognitive achievement test consisting of (20) questions, and it was characterized by honesty and reliability, and the experiment lasted (6) weeks

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Publication Date

Thu Apr 25 2019

Journal Name

Iraqi Journal Of Market Research And Consumer Protection

The Correlation between the Dimensions of Organizational Silence and the F Function Life an Exploratory Study of the Views of a Sample of Workers in the Health Center / Sulaykh: The Correlation between the Dimensions of Organizational Silence and the F Function Life an Exploratory Study of the Views of a Sample of Workers in the Health Center / Sulaykh

Correlation

Organizational silence

Quality of Function life.

أريج سعيد

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The research aims to test the effect of the behavioral factors (intangible) represented by an explanatory variable represented by organizational silence and a responsive variable of quality of Function life. The problem was the negative effects of the organizational silence on the morale of the employees and consequently their performance and the quality of function life. To collect the data and information needed to measure the two variables of research conducted in the health center / Sulaikh by taking a sample of (40) employees to test the hypotheses of research through the survey of their views, using statistical tools non parametric using the program. The most important recommendations were the establishment of training workshops fo

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Publication Date

Mon Jul 01 2019

Journal Name

Journal Of Educational And Psychological Researches

The Impact of Strategy 3-2-1 in acquiring Concepts of Sociology of fourth grade students: The Impact of Strategy 3-2-1 in acquiring Concepts of Sociology of fourth grade students

3-2-1 strategy

concepts

Sociology.

زينب حمزة راجي

, RUSSELL MAHMOOD SHNAYEH

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Abstract

The current research aims to identify the impact of triangular bridging strategy in the acquisition of sociology of fourth-stage students. To achieve the research objective, the following null hypotheses were adopted: there are no statistically significant differences at a significance level (0, 05) between the average grades of the experimental group students who studied the triangular bridging strategy in acquiring concepts of sociology and average grades of the control group. The researcher has selected the fourth-stage students from Alexandronah School for girls that s related to the Directorate General of Baghdad the sample consisted of (87) students at litera

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