• Effects of Carbon Content in Ferrite and Martensite on Lattice Parameter and it’s Diffusion Process (Computer Simulation) 

  Mengistu, Yilma (Addis Ababa Universty, 2011-01)

  Molecular dynamics and molecular static simulation has been performed to investigate the structural transition of martensite and the diffusion properties of single carbon atom in the bulk of ferrite. For both types of ...
• Role of Surface Chemistry in Modifying the Optical Properties of Silicon Nanostructure 

  Belege, Tsegaye (Addis Ababa Universty, 2010-06)

  We combine two model used earlier. We vary the fitting parameters C and α (which depend on surface, geometry, confinement, size, porosity and materials properties). We use surface energy (Es = 0.05eV), binding energy (Eb ...
• Investigations of Electronic Structure of Bare and Passivated Nanocrystalline Silicon Clusters and their Transport Properties 

  Teklahymanot, Solomun (Addis Ababa Universty, 2009-06)

  Silicon low dimensional structures are found to be extremely stable in comparison to bulk silicon along with variety of interesting electronic properties. They are established as potential candidates for various promising ...
• Simulation of Three-Layer Solid State Memcapacitor 

  Wami, Shiferaw (Addis Ababa Universty, 2010-06)

  Memcapacitors are capacitors whose capacitance depends on the past states through which the system has evolved. The focus of this thesis is on the possible realization of a three-layer solid-state memory capacitive ...
• Study the Effect of Ultraviolet Radiation on Polycrystalline Silicon Solar Cell 

  Teklu, Nigatu (Addis Ababa Universty, 2009-03)

  The effect of ultraviolet(UV)radiation on polycrystalline silicon solar cell was studied. The reflectance spectrum, performance parameter and external quantum efficiency was analyzed by varying exposure time for different ...
• Investigation of Damping Effects on Power Loss in an Optical Fiber Due to Higher Order Nonlinear Term 

  Abebe, Mulualem (Addis Ababa Universty, 2009-07)

  Many properties of optical fibers namely power loss, noise, distortion, attenuation, absorption, damping etc are guided by nonlinearities. They must be checked and calculated their effects before put into applications. ...
• First Principle Determination of Electronic Structures of Bimno3 Using Hubbard U Correction 

  Atlaw, Mesfin (Addis Ababa Universty, 2009-06)

  In this research work the electronic structure properties and lattice instability of BiMnO3 are examined by employing first principle DFT based techniques. First we perform a pseudopotential calculation using general ...
• Investigation of Calcite and Volcanic Ash for their Utilizations as Cement Filling and Additive Materials 

  Aregaw, Mengistu (Addis Ababa Universty, 2010-06)

  The purpose of this study is to use calcite and volcanic soil as cement filling and additive materials in order to maximize cement productions in Ethiopia. In this study the characteristics of calcite and volcanic soil, ...
• First Principle Simulation for Electronic Structures and Transport Properties of Edge Doped Graphene Nanostructures for Applications in Glucose Sensors 

  Semu, Gishu (Addis Ababa Universty, 2012-06)

  Glucose as adsorbed species on edges of the graphene nanostructures are found to create some significant variations among the nanostructure’s electronic properties and the changes are fruitfully tapped for futuristic ...
• Experimental Technique to characterize Macrobending Loss in Single Mode Fiber 

  Getu, Girum (Addis Ababa Universty, 2010-06)

  An experimental technique of macrobending losses for a single mode fiber (SMF) with different radius of curvature is presented. Macrobending losses for SMF are investigated experimentally, showing that a tight bent of ...
• Ab–initio Calculations of Structural and Electronic Properties of a BexZn1-xSe Ternary Alloy 

  Mulualem, Getasew (Addis Ababa Universty, 2012-06)

  We have used the ab-initio SIESTA code within the framework of DFT, LDA method to calculate the structural and electronic properties of BexZn1-xSe alloy for different compositions x = 0.0, 0.33, 0.66, and 1.0. The system ...
• Natural dye senistized photoelectrochemical cells Based on ZnO Nanoparticles 

  Yirga, Getachew (Addis Ababa Universty, 2012-06)

  This thesis focused on the study of dye-sensitized solar cells (DSSCs) based on ZnO nanoparticle. Our work started by synthesizing ZnO nanopartcile using sol-gel method. ZnO nanoparticles were synthesized and the size ...
• Model Computation of Water Clustering (H2O) n effect in the Negative Ion Proton Transfer Reactions 

  Dereje, Gemechis (Addis Ababa Universty, 2010-06)

  We report the effect of water clustering (H2O) n in the negative ion proton transfer reactions on reaction rate constants and the change in the Gibbs free energy of the corresponding reactions. Reaction rate constant of ...
• Electrocatalytic Reduction of Oxygen at Poly (4-Amino-3-Hydroxynaphtalene Sulfonic Acid)/Reduced Graphene Oxide Composite 

  Addis, Fitsum (Addis Ababa Universty, 2017-05)

  The rapid growth of the global population and industrial activities pose a great challenge to meeting ever-increasing energy demands. This thesis adapts a modified synthesis of graphene oxide (GO), an important starting ...
• The Effect of Chemical Additives on Photovoltaic Performance of P3HT:PCBM Bulk Heterojunction Solar Cells 

  Daniel, Eyob (Addis Ababa Universty, 2012-06)

  Organic bulk heterojunction solar cell devices based on blend of poly(3- hexylthiophene) (P3HT) and [6, 6] phenyl C61 butyric acid methyl ester (PCBM) with different concentration of propylthiouracil (PTU) additive have ...
• Screening of Natural Dyes for Use in Dye Sensitized Solar Cells 

  Jara, Desalegn (Addis Ababa Universty, 2012-06)

  Five natural dyes, extracted from natural materials such as flowers, were used as sensitizers to fabricate dye-sensitized solar cells (DSSCs). Dye-sensitized solar cells (DSSCs) were fabricated using natural dyes extracted ...
• Bragg-Williams Model of Ordered B2, L12 and L10 Type Binary Intermetallic Compounds Containing Point Defects 

  G.Egziabher, Daniel (Addis Ababa Universty, 2011-04)

  Ordered intermetallic compounds draw great interest at the present time because of both possible applications and fundamental scientific importance. The scientific interest is derived from the recognition that many ...
• Investigations of Half-Metallicity Among Doped and Un-Doped Graphene Nanostructures in Different Conformations for Spintronics Applications 

  Telay, Berhanu (Addis Ababa Universty, 2012-06)

  We have investigated the phenomenal of half-metallicity among various novel conformations of graphene nanoribbons (GNRs). The Density of States (DOS) and the Transmission spectrum (TS) of zigzag GNRs doped with boron ...
• An Investigation of Attenuation and Dispersion in Propagation Mode Characteristics of Optical Fiber Material Leading to Non-linearity 

  Getachew, Belay (Addis Ababa Universty, 2009-06)

  Study of non-linearity in optical fiber material has attracted tremendous attention over last two decades. Despite of many experimental and theoretical efforts to find the origin of non-linearity and to quantify the loss ...
• Firstprinciples Study of Lanthanum Manganite (Lamno3) 

  Akanie, Bayileyegn (Addis Ababa Universty, 2010-03)

  In this thesis, we have investigated the structural, electronic, and magnetic properties of pure LaMnO3 from first-principles using the quantum-ESPRESSO open-source code. Unlike previous theoretical works, most of which ...

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