Ali F. Al-rawaf
@alsafwa.edu.iq
Department of Anesthesia Techniques
AlSafwa University College
Dr. Ali F. Al-rawaf was born in Baghdad, Iraq, on June 11, 1993. He graduated from the University of Kerbala with a B.Sc. in Physics in 2015. He received his M.Sc. in Plasma Physics from the University of Kerbala in 2018. Graduated from the College of Science/ University of Baghdad with a Ph.D. in Plasma Physics in 2022. Currently, he works as a Lecturer at AlSafwa University College, Karbala, Iraq. He has a great interest in both Medical Plasma Physics and Computer Simulation.
EDUCATION
PhD in Plasma Physics at University of Baghdad - College of Science
RESEARCH INTERESTS
Plasma Medicine / Plasma Physics / Plasma Radiation / Comsol Multiphysics / OriginLab Origin / Adobe Photoshop / AutoCAD / LaTeX / Microsoft office
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ali F. Al-Rawaf, Sajjad H. Maan, Ammar S. Shuker, and Fadhil Khaddam Fuliful
AIP Publishing
Abdalsattar Kareem Hashim, Sara Salih Nayif, Elham Jasim Mohammed, Ali F. Al-Rawaf, and Ali Abid Abojassim
IOP Publishing
Abstract By using a sealed technology, radon levels were determined, annual effective dose, the effective content of radium, radon exhalation rate and uranium concentrations to be the total 30 samples materials used to paint the walls of buildings and homes in Iraq. It was found that the recommended value for all samples for radon concentration is with low potency radium content of 300 Bq / m3 and 370 Bq / kg respectively. In addition, Annual effective dose in all values was found to be less than the permission level (10 mSv / y). The values of exhalation rate relative to samples lower than the permission value (57.600 mBq/m2.h) set by UNSCEAR organization. The strong correlation (R2=1). It turns out that the content effective radium with the surface radon exhalation rate, the mass radon exhalation rate, and the uranium concentration, respectively. In general, the studied of 30 samples materials used to paint the walls of buildings and homes in Iraq be safe to use as construction material.
Ali F. Al-rawaf and Thamir H. Khalaf
University of Baghdad College of Science
In this paper, a numerical analysis was carried out using finite element method to analyse the mechanisms for streamer discharges. The hydrodynamic model was used with three charge carriers equations (positive ion, negative ion and electron) coupled with Poisson equation to simulate the dynamic of streamer discharge formation and propagation. The model was tested within a 2D axisymmetric tip-plate electrodes configuration using the transformer oil as the dielectric liquid. The distance between the electrodes was fixed at 1 mm and the applied voltage was 130 kV at 46 ns rising time. Simulation results showed that the time has a clear effect on the streamer propagation along the symmetry axis. In addition, it was observed that the highest value of the voltage was recorded at 46 ns and the minimum voltage required for insulation breakdown was 112 kV at 200 ns. It was revealed that the streamer velocity recorded the highest value when the streamer reaches the plate electrode and the lowest value when the streamer begins to propagate. Results also showed that the streamer discharge was dominated by positive ions while the negative ions have a low effect.
Ali F. Al-rawaf and Thamir H. Khalaf
IOP Publishing
Abstract To reveal the impact of formation and development of the streamer discharge on the dielectric liquid formed between pin-plate electrodes, a numerical model of transformer oil discharge in the electrode system is built which is based on the continuity equations coupled with Poisson’s equation. The influence of applied impulse voltage parameters such as rise time and voltage magnitude on the formation and development of the streamer discharge is evaluated in this model. In addition, the characteristic of the streamer discharge such as streamer velocity, electric field, and radius of streamer head have been investigated. Modeling results reveal that the higher impulse voltage amplitude form streamer discharges with longer paths, thicker columns, higher velocity, and greater radius. In addition, we find that the radius of the streamer head is greatly affected by the percentage of the predetermined electric field tube at the head, and slightly affected when streamer length increased. Modeling results also showed that the rise times had a clear effect on the radius streamer discharge and the distribution of electric fields.
Ali F. Al-rawaf, Fadhil Khaddam Fuliful, Mohammed K. Khalaf, and Husham. K. Oudah
Springer Science and Business Media LLC