Quantum Physics Stream
http://ir.haramaya.edu.et//hru/handle/123456789/226
Wed, 01 Feb 2023 03:12:45 GMT2023-02-01T03:12:45ZPREVALENCE AND fACTORS ASSOCIATED WITH POSTOPERATIVE COMPLICATIONS IN PATIENTS ADMITTED TO HIWOT FANA SPECIALIZED UNIVERSITY HOSPITAL, HARAR, EASTERN ETHIOPIA
http://ir.haramaya.edu.et//hru/handle/123456789/4031
PREVALENCE AND fACTORS ASSOCIATED WITH POSTOPERATIVE COMPLICATIONS IN PATIENTS ADMITTED TO HIWOT FANA SPECIALIZED UNIVERSITY HOSPITAL, HARAR, EASTERN ETHIOPIA
Asefa, Askual; Amin, Dr Abdi; Shure, (Assis Prof) Hirbo
Postoperative complication may be defined as negative outcome as perceived either by the surgeon or by the patients. It confers an increased risk of reoperation, prolonged length of stay, decline in disposition and increased mortality, and are a target for quality improvement programs. Ethiopia is one of the countries where postoperative complication is a major cause of morbidity and mortality. A clear understanding of the prevalence and factors affecting postoperative complications is essential for establishment of preventive strategies as well as treatment protocols. This is study is aimed to assess the prevalence and factors associated with postoperative complications. Method: Health facility-based cross-sectional study was conducted among 204 patients hospitalized for surgical cases from October 1/2020 to January 31/2020. Data was extracted with paper based medical charts, operational and anesthesia note, by direct observation and patients‟ interview. All patients were followed daily before, during and after operation until discharge. Data were analyzed using Statistical Package for Social Science (SPSS) for window version 20.0 software. Factors associated with postoperative complications were identified using multivariable logistic regression model. P-value less than 0.05 was considered to be statistically significant. Result:A total of 204 patients were included in the study. Forty seven patients (23%) developed postoperative complications. Elevated white blood cell count, AOR=3.5(95%CI [1.36, 9.12, P=0.009]), prophylactic antibiotics administration after surgical incision AOR=5.46(95%CI [2.30, 12.96, P=0.000]), and surgeries done by junior residentsAOR = 11.15(95% CI [2.70, 46.13, P=0.001]) were independent predictors for postoperative complications. Conclusion: Elevated white blood cell count (> 11,000/mm3), prophylactic antibiotics administration after surgical incision, and surgeries done by junior residentsare independent predictors of postoperative complications. Therefore, timely administration of antibiotics and supervision of junior residents is recommended.
52p.
Mon, 01 Feb 2021 00:00:00 GMThttp://ir.haramaya.edu.et//hru/handle/123456789/40312021-02-01T00:00:00ZPROPAGATOR OF DIRAC PARTICLES IN PRESENCE OF UNIFORM BACKGROUND MAGNETIC FIELD
http://ir.haramaya.edu.et//hru/handle/123456789/4030
PROPAGATOR OF DIRAC PARTICLES IN PRESENCE OF UNIFORM BACKGROUND MAGNETIC FIELD
Tsegaye Hailegiorgise, Ashenafi; Bekele, (PhD) Gashaw
The main purpose of this study is to discuss the properties of the solutions of the Dirac equation and calculate the Dirac propagator in the presence of a uniform background magnetic field. In particular the focus of the work is on the nature of the solutions, their orthonormality properties and how these solutions depend on the choice of the vector potential giving rise to the magnetic field. The spin-sum of the solutions is explicitly calculated. After the Dirac equation is exactly solved then we proceed to calculate the quantization of the solutions. Using these results the Dirac propagator in the presence of a uniform background magnetic field is calculated. The result have shown that the dispersion of the electron is seen to change from its form in the vacuum, the solution of the Dirac equation depends on the landau level, the energy of electron is seen to degenerate except at the lowest landau level, the orthonormality of the spinors closely resembles the corresponding results in vacuum. Comparing our spin-sum result with the result of others researchers work the spin sum also depends on the particular gauge we work in and would be different if we choose another gauge to represent the magnetic field. The Dirac propagator in the presence of magnetic field is different from the free field propagator it also depends on the Landau levels. Most of the quantities, the solutions of the Dirac equation, the normalization condition the spin sum and the propagator in the presence of uniform magnetic field depend on the choice of vector potential giving rise to the magnetic field.
119p.
Tue, 01 Sep 2020 00:00:00 GMThttp://ir.haramaya.edu.et//hru/handle/123456789/40302020-09-01T00:00:00ZSOLVING THE MODIFIED DIRAC EQUATION FOR MUON MOVING IN STRONG BACKGROUND ELECTRIC FIELD
http://ir.haramaya.edu.et//hru/handle/123456789/3963
SOLVING THE MODIFIED DIRAC EQUATION FOR MUON MOVING IN STRONG BACKGROUND ELECTRIC FIELD
Hajo Gemmeda, Jeylan; Bekele, (PhD) Gashaw
In this thesis, the covariant form of Dirac equation has been modified for a relativistic muon by incorporating the uniform background electric field through the principle of minimal coupling. The Electromagnetic (EM) field has been gauged so as to produce a constant electric field pointing in a particular direction, and a vanishing magnetic field. Then the modified Dirac equation has been manipulated using separation of variables to take the form the Weber’s differential equation for which the parabolic cylinder functions (PCFs) are solutions. Finally, the general form of spin-sum has been derived for two spin states. Unlike the background magnetic field the presence of electric field has failed to produce discrete energy eigenstates, which means fermions moving in a latter field behave like classical particles. Moreover, the derived spin sum shows strong dependence on the background electric field
60p.
Tue, 01 Sep 2020 00:00:00 GMThttp://ir.haramaya.edu.et//hru/handle/123456789/39632020-09-01T00:00:00ZRELATIVISTIC QUANTUM DESCRIPTION OF MUONIC HYDROGEN ATOM: CASE OF FINITE SIZED NUCLEUS
http://ir.haramaya.edu.et//hru/handle/123456789/3946
RELATIVISTIC QUANTUM DESCRIPTION OF MUONIC HYDROGEN ATOM: CASE OF FINITE SIZED NUCLEUS
Diriba, Eshetu; Bekele, (PhD) Gashaw
Muonic hydrogen is formed when electron is replaced by muon in an atom in which the mass of muon is 207 times larger than that of an electron, the radii of the muonic orbits are much smaller than that of electrons. The main purpose of this study is to theoretically describe muonic hydrogen with finite-sized proton in the framework of relativistic quantum mechanics. The main focus of this work are to determine the energy levels of muonic hydrogen with point-like proton at its center, to determine the energy eigenvalues of muonic hydrogen caused by the consideration of finite size nucleus. The derivation and solutions of the modified Dirac equations are performed in presence of central potential. The confluent hypergeometric function is used to find the exterior wave functions. In both analytical and numerical calculations we have used the experimental nuclear radius which is 0.8768fm. In the case of finite size nucleus, the matching equation is solved both analytically and numerically to obtain approximate energy eigenvalues of the muonic hydrogen atom. In the analytical calculations, the energy eigenvalue has been calculated for finite size nucleus and the result is 102.795345MeV which is lower than the numerical result 105.6545718MeV and this low result of energy is due to a number of bad approximations and the difficulties in manual calculation. Numerical results have generated using Matlab R2019a programming language. The numerical result of energy eigenvalue have been calculated and tabulated for different states. Probability density computed for the case of finite size nucleus shows that muon has a high probability to be found near the nucleus of an atom for 1��1/2 state when compared to the 2��1/2 excited state
104p.
Mon, 01 Feb 2021 00:00:00 GMThttp://ir.haramaya.edu.et//hru/handle/123456789/39462021-02-01T00:00:00Z