Fizik: Recent submissions

  • Geometric formulation of lagrangian mechanics and symmetries 
    Türeli, Sina. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    We start the thesis by covering the geometric formulation of time-independent and time-dependent Lagrangian mechanics and the concept of dynamical symmetry. Then we give two applications. First we review and tie together ...
  • Radio frequency energy recovery for particle accelerators 
    Yıldız, Veli. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    During the operation of particle accelerators considerable amount of power coming to RF cavities is converted to heat in load resistors placed after RF cavities. When the CERN’s Super Proton Synchrotron is analyzed as an ...
  • Cosmological perturbations in string gas cosmology 
    Özsoy, Ogan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    The current model of the early universe is mainly based on the in ationary scenario. Despite its phenomenological success in providing a solid mechanism for the generation of cosmological uctuations in the early universe, ...
  • Triggerless particle identification systems using FPGA 
    Güney, Veli Uğur. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    As the beam energy and event rate in experimental particle physics setups increases, the acquisition and analysis of the data created at the experiments become more complex. In the beginning, counting the recorded events ...
  • Unitary group and quantum group invariant q-oscillators and fibonaccization 
    Ünel, N. Gökhan. (Thesis (M.S.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1994., 1994.)
    After a review of different types of q-oscillators and the relationship between their creation/ annihilation operators, the derivation of the q generalized version of the LeviCivita tensor (E) is given. The properties of ...
  • Deforming SO(4,2) generators 
    Kılıç, Delalcan. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    The energy spectrum and degeneracy of a Hamiltonian can be studied using either the theory of special functions or spectrum generating algebras. In this thesis the second approach is used for the analysis of the H-atom ...
  • Laser assisted growth of silicon nano-structures 
    Demirbaş, Elif. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    In this study, the aim is to produce homogeneous porous silicon(PS) nanostructures and then to observe the effect of resistivity of starting silicon samples. P-type silicon wafers with di erent resistivity are prepared by ...
  • Ionization energies of small atoms by momentum space electrostatics 
    Ülker, Soydaner. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    To calculate ionization energies, a method which uses momentum space techniques for electrostatic problems is described. With this method, a total of fty ve ionization energies of the rst ten elements in the periodic ...
  • Measurement of physical and optical properties of thin films with an ellipsometric technique 
    Ertuğrul, Emine. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    In this thesis, working mechanism of ellipsometer is studied in details. Thickness and refractive index of polyethyleneglycol(PEG), gold and silicon dioxide lms are measured using an elipsometer. PEG is attached to a gold ...
  • A study on the stability of the led gain monitoring system for the CMS-HF PMTs during 2009 
    Özbek, Melih. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2010., 2010.)
    The Hadronic Forward (HF) calorimeter improves the jet detection and the missing transverse energy resolution of the Compact Muon Solenoid (CMS). In HF, the Photo Multiplier Tubes (PMTs) convert optical signals (i.e., ...
  • Mechanically exfoliated single and multilayer graphene sheets and graphene field effect transistor 
    Manukyan, Selin. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Graphene is a single layer of graphite sheet; one atom thick sp2-bonded carbon atoms organized on a plane. It has extremely interesting electrical properties, which o ers various applications in a number of nanometer scale ...
  • Nonperturbative aspects of quantum field theories 
    Kaynak, Burak Tevfik. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The main focus of this thesis is to elaborate rather unorthodox methods throughout a diverse range of mathematical techniques, which allow us to study quantum field theoretical models in a nonperturbative context. The ...
  • Dynamical structure analysis of five binary galaxy clusters observed with XMM-Newton x-ray observatory 
    Beygu, Burcu. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Clusters of galaxies are thought to form by accretion of galaxies along the cosmic filaments, and merging of clusters formed earlier. Observations and hydrodynamic simulations show the strong effects of mergers on physical ...
  • Solar axion production and detection mechanisms 
    Özuğurel, Umut Deniz. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Production mechanisms of the axion particle in the Sun as well as the detection principle and the data analysis methods that the CAST experiment is based on are reviewed. It is shown that the solar axion production can be ...
  • Coherence and wavelength effects on the growth mechanism of porous silicon nano-structures 
    Saygılı, Aslı Çakır. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this study, the objective is first to produce regular porous silicon(PS) nanostructures and then to observe the effects of wavelength and coherence length of the light, which is used for illumination, on the growth ...
  • The braided algebra and its Jordan-Schwinger construction in terms of Q-deformed fermionic oscillators 
    Halıcılar, Fulya. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    The standard bosonic and fermionic Jordan-Schwinger constructions for the Lie algebra of SU(2) are reviewed in this thesis. It is shown that the Jordan-Schwinger constructions of the quantum group with q as deformation ...
  • Aspects of string thermodynamics 
    Arslanargın, Ayşe. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis, we study thermodynamics of closed strings and open strings on D-branes in the microcanonical ensemble. Both single string and multi-string density of states are obtained from energy spectrum. In the ...
  • Gauge theories based on quantum groups, representations of the braid group 
    Yıldız, Ali. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1993., 1993.)
    Possible formulations of gauge field models where the gauge group is a quantum group are discussed. The exponential map from the generators of the Lie algebra analog of the quantum group SUq(2) to the quantum group SUq(2) ...
  • Fluorescence lifetime images of dye molecules 
    Altundal, Yücel. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    In this thesis, Fluorescence Lifetime Images of perylene and bodipy dye molecules mixture are studied using a time-correlated single photon-counting technique. Lifetimes of dye molecules are calculated pixel-by-pixel from ...
  • Improvement of calorimeter-based muon identification and its application to H → ZZ(*) → 4ℓ analysis in the ATLAS experiment 
    Schmidt, Nesliha Becerici. (Thesis (M.S.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Outermost part of the ATLAS detector, the muon spectrometer, is dedicated for detection of muons and measurement of their properties. However, combining the measurements from other parts of the detector with muon spectrometer ...