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Browsing College of Natural Sciences by Title

Browsing College of Natural Sciences by Title

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  • Tadewos, Mesfin (Addis Ababa University, 2007-08)
    Singular value decomposition, correlation and composite analyses were used to investigate the tropical oceans thermodynamic and atmospheric modulations over the southern Ethiopian climate, water resource and vegetation ...
  • Tefera, Desalegne (Addis Ababa University, 2007-07)
    Atmospheric ozone is of interest not just because of the danger of ozone depletion in stratosphere but also because of its basic role in tropospheric chemistry and oxidation reactions, in controlling the temperature ...
  • Abye, Ageze (Addis Ababa University, 2018-05-03)
    The trust region method, minimization of a real valued function f by using its quadratic model subject to Euclidean norm trust region constraint, occurs in many trust region algorithms. In most cases, it is inexpensive ...
  • Leul, Hewan (Addis Ababa University, 2018-06-03)
    In this project we give trust-region algorithms for nonlinear optimization. Trust-region methods are robust and can be applied to ill-conditioned problems. A conjugate gradient trust-region algorithm is presented to ...
  • Yeshitla, Abaye (Addis Ababa University, 2018-05-02)
    In this project, we propose a trust region dogleg method algorithms to solve a trust region subproblems arising form unconstrained optimization. The method can deal with by constricting a dogleg paths. The case when the ...
  • Negash, Tewodros (Addis Ababa University, 2015-11)
    III this project a derivative-free (DF) surrogate-based trust regioll optimization approach is proposed. In the proposed approach, quadratic surrogate models are constructed and successively IIpdated. The generated surrogate ...
  • Alelign Amir (Addis Ababa University, 2019-06-05)
    Tuberculosis (TB), an infectious disease caused by Mycobacterium tuberculosis complex (MTBC), remains a public health problem in Ethiopia. However, there is still shortage of epidemiological data in different parts of ...
  • Worku, Yeshi (Addis Ababa University, 2017-08)
    Electromagnetic waves (EMWs) propagating in magnetized plasma with ferromag- netic grains (MPFG) in a direction perpendicular to the applied constant magnetic eld are investigated theoretically and numerically. The MPFG ...
  • Bezabih, Tewodros (Addis Ababa Universty, 2011-06)
    The steady state absorption, fluorescence excitation and emission spectra of 2, 2′- biquinoline have been studied in polar and non-polar solvents. Absorption spectra are almost independent of solvent polarity. The ...
  • Guale, Aklilu (Addis Ababa Universty, 2010-07)
    The steady state absorption, fluorescence excitation and emission spectra of 2,2’-bipyridine have been studied in polar solvents. Absorption spectra are almost independent of solvent polarity. The dependence of fluorescence ...
  • Gezae Taame (Addis Ababa University, 2014-02-02)
    Plants have been and will remain vital to mankind, animals as well as the environment. The present study focuses on the phytochemistry of the endemic food and medicinal plant species known as Moringa stenopetala, which is ...
  • Feye, Ashenafi (Addis Ababa University, 2003-06)
    We present two mechanisms for segregating mixtures of Brownian particles. In the first model, we used a W-potential, which is piece-wise linear, with non-homogeneous temperature background to separate mixtures of two ...
  • Eyasu, Seyoum (Addis Ababa University, 2013-06)
    It was generally accepted that metal covered inclusions in a dielectric host matrix have one maxima of the enhancment factor at one resonant frequency close to the frequency of the surface plasmon. Recently,Sisay shewamare, ...
  • Assefa, Gebrehiwot (Addis Ababa University, 2011-06)
    Tigrigna language is a Semitic language spoken by the Tigray people in Northern Ethiopia and Eritrea which has more than six million speakers worldwide. There are large collections of Tigrigna document available in web, ...
  • Getachew, Solomon (Addis Ababa University, 2011-06)
    In this thesis we study the statistical properties of two-mode coherent and laser light beams in a cavity coupled to two-mode vacuum reservoir. We obtain c-number Langevin equations using the pertinent master equation. ...
  • Ayele, Mesfin (Addis Ababa University, 2012-06)
    Employing c-number Langevin equations and taking into considerations the correlation properties of the noise forces, we obtained the antinormally-ordered characteristic func- tion, and with the aid of this result, we ...
  • Worku, Alelign (Addis Ababa University, 2011-06)
    Using the antinormally-ordered characteristic function, we have determined the Q function for a two-mode coherent state as well as a two-mode squeezed vacuum state. Using the pertinent Q function, we have calculated the ...
  • Siyum, Yibeltal (Addis Ababa University, 2011-06)
    Applying c-number Langevin equations, we have calculated the Q function for the two- mode coherent and subharmonic light. We have then determined the Q function for the superposition of these two light beams. With the ...
  • Melaku, Menwuyelet (Addis Ababa University, 2012-02)
    With the aid of c-number Langevin equations, we have calculated the Q-functions for the two-mode coherent and subharmonic cavity light beams. Applying the input-output relation, we have obtained the Q-functions for the ...
  • Tirfie, Lemma (Addis Ababa University, 2018-07-03)
    In this thesis, we have investigated the statistical and squeezing properties of the light produced by a two-mode subharmonic generating system in a cavity driven by two-mode coherent light and coupled to two-mode thermal ...

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