Drag Forces under Longitudinal Interaction of Two Particle

Abbas H. Sulaymon; Sawsan A. M. Mohammed

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Publication Date

Sat Jun 30 2007

Journal Name

Iraqi Journal Of Chemical And Petroleum Engineering

Volume

8

Issue Number

2

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Drag Forces under Longitudinal Interaction of Two Particle

Hydrodynamic interaction drag coefficient

Abbas H. Sulaymon

Sawsan A. M. Mohammed

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Direct measurements of drag force on two interacting particles arranged in the longitudinal direction for particle Reynolds numbers varying from J O to 103 are conducted using a micro-force measurement system. The effect of the interparticle distance and Reynolds number on the drag forces is examined. An empirical equation is obtained to describe the effect of the interparticle distance (l/d) on the dimensionless drag.

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Publication Date

Tue Nov 01 2016

Journal Name

Journal Of Engineering

Modeling of Comparative Performance of Asphalt Concrete under Hammer, Gyratory, and Roller Compaction

Marshall Test

Marshall Hammer

Roller compactor

Gyratory compaction

Saad I.

Mahmood Khalid

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The main objective of this study is to develop predictive models using SPSS software (version 18) for Marshall Test results of asphalt mixtures compacted by Hammer, Gyratory, and Roller compaction. Bulk density of (2.351) gm/cc, at OAC of (4.7) % was obtained as a benchmark after using Marshall Compactor as laboratory compactive effort with 75-blows. Same density was achieved by Roller and Gyratory Compactors using its mix designed methods.

A total of (75) specimens, for Marshall, Gyratory, and Roller Compactors have been prepared, based on OAC of (4.7) % with an additional asphalt contents of more and less than (0.5) % from the optimum value. All specimens have been subjected to Marshall Test. Mathematical model

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Publication Date

Mon Jun 19 2023

Journal Name

Journal Of Engineering

Some Properties of Superplasticized and Retarding Concrete Under Effect of Accelerated Curing Methods

superplasticizer and retarding

accelerated curing

warm water

boiling water

setting time

slump

fresh density

compressive strength

water absorption

Dalia Shakir

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In recent decades, tremendous success has been achieved in the advancement of chemical admixtures for Portland cement concrete. Most efforts have concentrated on improving the properties of concrete and studying the factors that influence on these properties. Since the compressive strength is considered a valuable property and is invariably a vital element of the structural design, especially high early strength development which can be provide more benefits in concrete production, such as reducing construction time and labor and saving the formwork and energy. As a matter of fact, it is influenced as a most properties of concrete by several factors including water-cement ratio, cement type and curing methods employed.
Because of acce

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Publication Date

Fri May 21 2021

Journal Name

Transportation Infrastructure Geotechnology

Behavior of Floating Stone Columns and Development of Porewater Pressure Under Cyclic Loading

Mahdi

Anwar

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Publication Date

Sun Oct 02 2022

Journal Name

Engineering, Technology & Applied Science Research

Reliability Analysis of an Uncertain Single Degree of Freedom System Under Random Excitation

M. S. M.

R. M.

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In practical engineering problems, uncertainty exists not only in external excitations but also in structural parameters. This study investigates the influence of structural geometry, elastic modulus, mass density, and section dimension uncertainty on the stochastic earthquake response of portal frames subjected to random ground motions. The North-South component of the El Centro earthquake in 1940 in California is selected as the ground excitation. Using the power spectral density function, the two-dimensional finite element model of the portal frame’s base motion is modified to account for random ground motions. A probabilistic study of the portal frame structure using stochastic finite elements utilizing Monte Carlo simulation

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Publication Date

Mon Jan 01 2024

Journal Name

Aip Conference Proceedings

Effects of CFRP anchors on the performance of RC beam under flexural loading

Bahaa Hussein

Alaa Hussein

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(1)

Publication Date

Tue Sep 01 2020

Journal Name

Results In Engineering

Performance evaluation of asphalt concrete mixes under varying replacement percentages of natural sand

Natural sand

Moisture susceptibility

Permanent deformation

Fatigue

Amjad H.

Harith

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Frequently, load associated mode of failure, rutting and fatigue, are the main failure types found in some newly constructed roads within Baghdad, the capital of Iraq, and some suburban areas. The use of excessive amount of natural sand in asphalt concrete mixes which is attractive to local contractors could be one of the possible causes to the lack of strength properties of the mixes resulting in frustration in the pavement performance. In this study, the performance properties of asphalt concrete mixes with two natural sand types, desert and river sands, were evaluated. Moreover, five replacement rates of 0, 25, 50, 75, and 100% by weight of the fine aggregate finer than 4.75 were used. The performance properties including moisture susc

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(21)

Publication Date

Fri Sep 15 2023

Journal Name

Journal Of Baghdad College Of Dentistry

FEM: Mono-implant cement retained crown with two different adhesive materials

FEA

mono-Implant

cement

adhesive

all-ceramic

stress

deformation

Shahad M

Saja A

Raad S

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Background: The finite element method (FEM) is expected to be one of the most effective computational tools for measuring the stress on implant-supported restorations. This study was designed using the 3D-FEM to evaluate the effect of two adhesive luting types of cement on the occlusal stress and deformation of a hybrid crown cemented to a mono-implant. Materials and Method: The mono-screw STL file was imported into the CAD/CAM system library from a database supported by De-Tech Implant Technology. This was to assist in the accurate reproduction of details and design of a simulated implant abutment. Virtually, a digital crown was designed to be cemented on an abutment screw. A minimum occlusal thickness of 1mm and marginal fitting of 1.2

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(2)

Publication Date

Mon Jan 01 2024

Journal Name

Anais Da Academia Brasileira De Ciências

Morphological study for Accipitrid birds (Accipitridforms, Accipitridae) in Iraq; part two

A part two of Accipitridae Family members that belong to three genera: Circus

Gyps

and Neophron were documented as morphometrics

distribution ranges

and conservation status were reviewed and comprehensively discussed. A total of 29 voucher specimens belong to six species which are conserved in the “Iraq Natural History Research Center and Museum INHM” as follow: Marsh Harrier Circus aeruginosus (Linnaeus

1758)

Hen Harrier Circus cyaneus (Linnaeus

1766)

Montagus Harrier Circus pygargus (Linnaeus

1758)

Pallid Harrier Circus macrourus (Gmelin

1770)

Egyptian vulture Neophron percnopterus (Linnaeus

1758)

and Griffon vulture Gyps fulfus (Hablitz

1783). The results revealed significant criteria about near threatened NT species IUCN and Birdlife International listed as Pallid Harrier Circus macrourus

and Endangered (EN) species as Egyptian vulture Neophron percnopterus globally decreasing population trend.

HIND D.

KHALIDA I.

AFKAR M.

SUHAD Y.

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Publication Date

Thu Dec 01 2016

Journal Name

Iraqi Journal Of Physics, 2016

Energy transfer process between two laser compounds coumarin 334 & rhodamine 590

Key words:Energy transfer

laser compounds

dye spectrum.

Nathera

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Abstract: In the current research the absorption and fluorescence spectrum of Coumarin (334) and Rhodamine (590) in ethanol solvent at different concentration (10-3, 10-4, 10-5) M had been studied. The absorption intensity of these dyes increases as the Concentration increase in addition to that the spectrum was shifted towards the longer wavelength (red shift). The energy transfer process has been investigated after achievement this condition. The fluorescence peak intensity of donor molecule was decrease and its bandwidth will increases on the contrary of the acceptor molecule its intensity increase gradually and its bandwidth decreases as the acceptor concentration increase.

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Publication Date

Tue Sep 08 2020

Journal Name

Baghdad Science Journal

A Comparison Between Two Shape Parameters Estimators for (Burr-XII) Distribution

Burr-XII failure model

Maximum likelihood estimator

Moments estimator

Percentile estimator.

Shurooq A.K.

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This paper deals with defining Burr-XII, and how to obtain its p.d.f., and CDF, since this distribution is one of failure distribution which is compound distribution from two failure models which are Gamma model and weibull model. Some equipment may have many important parts and the probability distributions representing which may be of different types, so found that Burr by its different compound formulas is the best model to be studied, and estimated its parameter to compute the mean time to failure rate. Here Burr-XII rather than other models is consider because it is used to model a wide variety of phenomena including crop prices, household income, option market price distributions, risk and travel time. It has two shape-parame

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