Details

Publication Date

Mon Nov 01 2010

Journal Name

Iraqi Journal Of Physics

Volume

8

Issue Number

12

Choose Citation Style

Statistics

Abstract Views

92

Galley Views

43

Statistics

Streams and plasma parameters experimental studies in He-CO gas mixtures

Streams plasma parameters He-CO gas

Hamid K.

...Show More Authors

DC glow discharges were generated between a thin cylindrical anode and a flat cathode, streamers are thought to propagate by photo-ionization; the parameters of photo-ionization depend on the He: CO ratio. Therefore we study streamers in He ( 90%, 80% and 70% ) with (10%, 20% and 30%) CO respectively. The streamer diameter is essentially the change by increase for similar voltage and pressure in all He-CO mixtures.

View Publication Preview PDF

Quick Preview PDF

Publication Date

Sat Jan 01 2022

Journal Name

Proceeding Of The 1st International Conference On Advanced Research In Pure And Applied Science (icarpas2021): Third Annual Conference Of Al-muthanna University/college Of Science

A theoretical study including the breakdown voltage characteristics for some industrial gases

Boltzmann transport equation

break down voltage

electron energy distribution function

transport parameters

E/N Townsend parameter

Raad

...Show More Authors

Industrial characteristics calculations concentrated on the physical properties for break down voltage in sf6, cf4 gases and their mixture with different concentrations are presented in our work. Calculations are achieved by using an improved modern code simulated on windows technique. Our results give rise to a compatible agreement with the other experimental published data.

View Publication Preview PDF

(2)

Publication Date

Sun Dec 17 2017

Journal Name

Al-khwarizmi Engineering Journal

Formation of Compressive Residual Stress by Face Milling Steel AISI 1045

Face milling

Cutting parameters

Steel AISI 1045

Residual stresses

XRD

DOE

RSM

Modeling and Numerical optimization.

Ahmed Naif

Samir Ali

Samir Zidan

...Show More Authors

Abstract

Machining residual stresses correlate very closely with the cutting parameters and the tool geometries. This research work aims to investigate the effect of cutting speed, feed rate and depth of cut on the surface residual stress of steel AISI 1045 after face milling operation. After each milling test, the residual stress on the surface of the workpiece was measured by using X-ray diffraction technique. Design of Experiment (DOE) software was employed using the response surface methodology (RSM) technique with a central composite rotatable design to build a mathematical model to determine the relationship between the input variables and the response. The results showed that both

View Publication Preview PDF

Publication Date

Wed Jul 01 2020

Journal Name

Journal Of Engineering

Improvement the Mechanical Characteristics of Alloy Steel DIN 41Cr4 by Shot Peening

Shot peening

Fatigue life and Fatigue limit

Fatigue strength improvement factor

Alloy steel DIN 41Cr4

Vibrations parameters

Zeina shaker

Jumaa Salman

...Show More Authors

The effects of shot peening treatment (SPT) were studied at (10,20, and 30) minutes on the rotating bending fatigue behavior and the behavior of the alloy steel DIN 41Cr4 vibrations. The hardness test, tensile test, constant amplitude fatigue tests, and the vibration measurements were performed on samples with and without cracks at room temperature (RT), also, the fracture surface was examined and analyzed by a Scanning Electron Microscope (SEM). The results of the investigations, for example, Stress to Number of cycles to failure (S-N) curves, fatigue strength improvement factor of 5% to 10%, the decreasing percentage of maximum Fast Fourier Transform (FFT) acceleration of the shot-peened condition were compared to untr

View Publication Preview PDF

(1)

Publication Date

Sun Jun 23 2019

Journal Name

American Rock Mechanics Association

Using an Analytical Model to Predict Collapse Volume During Drilling: A Case Study from Southern Iraq

reservoir geomechanics

strength

Rock mechanics

borehole collapse

Reservoir Characterization

Upstream Oil & Gas

pore pressure

Wellbore Design

horizontal stress

Drilling

Ahmed K.

Asmaa

Usama

Ralph E.

...Show More Authors

Zubair Formation is one of the richest petroleum systems in Southern Iraq. This formation is composed mainly of sandstones interbedded with shale sequences, with minor streaks of limestone and siltstone. Borehole collapse is one of the most critical challenges that continuously appear in drilling and production operations. Problems associated with borehole collapse, such as tight hole while tripping, stuck pipe and logging tools, hole enlargement, poor log quality, and poor primary cement jobs, are the cause of the majority of the nonproductive time (NPT) in the Zubair reservoir developments. Several studies released models predicting the onset of borehole collapse and the amount of enlargement of the wellbore cross-section. However, assump

View Publication

Publication Date

Thu Mar 18 2010

Journal Name

Spe Projects, Facilities & Construction

Correlating Optimum Stage Pressure for Sequential Separator Systems

separation and treating

PVT measurement

optimization problem

Upstream Oil & Gas

Phase Behavior

objective function

optimum stage pressure

GOR

Artificial Intelligence

Mohammed S.

Omar

...Show More Authors

Summary<p>A study to find the optimum separators pressures of separation stations has been performed. Stage separation of oil and gas is accomplished with a series of separators operating at sequentially reduced pressures. Liquid is discharged from a higher-pressure separator into the lower-pressure separator. The set of working separator pressures that yields maximum recovery of liquid hydrocarbon from the well fluid is the optimum set of pressures, which is the target of this work.</p><p>A computer model is used to find the optimum separator pressures. The model employs the Peng-Robinson equation of state (Peng and Robinson 1976) for volatile oil. The application of t</p> ... Show More

View Publication

(15)

(13)

1 2 3 4 ... 2549 2550 2551 2552