Browsing Ph.D. Theses by Title

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  • Bound state solutions of the Schrödinger equation for potentials with dirac delta functions 
    Uncu, Haydar. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    A general method for the bound state solutions of the SchrÄodinger equation for analytically solvable potentials with any ¯nite number of Dirac delta functions is intro- duced for n-dimensional systems. Then, the potentials ...
  • Boundary effects on Bose-Einstein condensation in ultra-static space-times 
    Ertuğrul, Emine. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    In this theses relativistic boson anti-boson system, inside d dimensional box B with volume V and surface area A, which is a sub-manifold of d dimensional manifold M is studied. Mellin-Barnes Transformations and short time ...
  • CERN LINAC4 beam dynamics studies and commissioning up to 12 MeV 
    Yıldız, Veli. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2015.)
    Linac4 is a normal conducting, 160 MeV H{u100000} ions accelerator that is being constructed within the scope of the LHC Injectors Upgrade project. Linac4 will be connected to the Proton Synchrotron Booster during the next ...
  • Chaotic structures in conductivity mechanisms 
    Yıldırım, H. Ahmet. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2005., 2005.)
    Chaotic behavior in the transient current through thin Aluminum-PMMA-Alu-minum films has been analyzed for times ranging up to 30000s, in the temperaturerange 293-363 K for applied voltages in the range 10-80V. The general ...
  • Chaoticity analysis of the current through pure, hydrogenated and hydrophobically modified PEG-SI thin films under varying relative humidity 
    Atak, Kaan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Polyethylene Glycol is known to have an irregular current characteristic under constant voltage and slowly varying relative humidity. In this study the current through a thin film of Gamma-isocyanatopropyltriethoxysilane ...
  • Chemical enrichment history and gas mass fraction of the galaxy cluster abell 3112 
    Ezer, Cemile. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    Clusters of galaxies are the largest concentrations of con ned matter in the Universe. Their deep potential well locks all metals produced by stars and galaxies within the intra-cluster medium. The spatial distribution of ...
  • Cononical structure and integrability of new-dimensional field theories 
    Neyzi, Fahrünisa. (Thesis (Ph.D.)- Bogazici University. Institute for Graduate Studies in Science and Engineering, 1984., 1984.)
  • Cosmology and spontaneous symmetry breaking 
    Saygılı, Kamuran. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1998., 1998.)
    In the first problem we investigate a model which incorporates spontaneous symmetry breaking and gravitation in the context of scalar-tensor theory. Present day value of the gravitational constant is induced by the vacuum ...
  • Cross sections for neutron-deuteron elastic scattering in the energy range 135 - 250 MeV 
    Ertan, Erol. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    New results for neutron-deuteron elastic scattering cross sections at energies from 135 to 250 MeV and center-of-mass angles from 80 to 130 have been measured at the WNR facility of the Los Alamos Neutron Science Center ...
  • Cylindrically symmetric spacetimes with pure rediation 
    Delice, Özgür. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    In this thesis we have investigated some solutions of Einstein's field equations having cylindrical symmetry. The corresponding energy momentum tensor of most of these solutions has pure radiation equation of state. First, ...
  • Dense molecular gas tracers in water megamaser galaxies 
    Farhan, Ahlam. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2021., 2021.)
    Since their discovery in 1979, water megamasers (H2OMMs) have been of special interest for both astrophysicists and cosmologists. The unique environment they are emitted from is interesting, being located inside accretion ...
  • Dynamic properties of phase change in Ge2Sb2Te5 (GST) based nano memory cells & magnetic bubbles in thin film perpendicular anisotropy nanomagnets 
    Çinar, İbrahim. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    In this thesis, two di erent technologies with memory applications were studied. The rst one, Phase Change Memory (PCM), is considered a potentially revelation technology for future ultra-high density data storage ...
  • Effects of different types of fields to cosmology and of extra dimension to FCNC hadronic processes of the SM 
    Katırcı, Ayşe Nihan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    The Effects of Different Types of Fields to Cosmology. Alternative cosmological models are proposed as a harbinger of new physics to overcome the perceived short- comings of the standard theory of cosmology (ACDM). We ...
  • Effects of gases on optical properties of polyethylene glycol 
    Bilen, Bükem. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2007., 2007.)
    Humidity induced changes in the refractive index and thickness of polyethylene glycol (PEG) thin films are in situ determined by optical waveguide spectroscopy. PEG brushes are covalently attached to the surface of a thin ...
  • Effects of humidity and various gases on the electrical conductivity of polyethylene glycol 
    Erdamar, Özgül. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2006., 2006.)
    Characterization of the electrical properties of covalently linked pure, hydrogenated and hydrophobically modified poly{ethylene glycol} (PEG) thin films under a changing relative humidity is examined by dc measurements. ...
  • Exactly solvable potentials with Dirac delta point interactions 
    Erkol, Hakan. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    A general method to obtain s-wave bound states of the Schrödinger equation for analytically solvable potentials together with a finite number of the Dirac delta functions is presented for three-dimensional systems. The ...
  • Fibre optic wedge type cavity random laser 
    Yartaşı, Ekrem. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    In this work, a fibre optic wedge type cavity, with arbitrarily distributed scattering centres, is employed to construct a flexible, cost effective and low threshold random laser. The wedge cavity is obtained through the ...
  • Fluorescence dynamics of dye-dye and dye-nanostructures interactions 
    Açıkgöz, Sabriye. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2011., 2011.)
    The decay dynamics of (Boradiazaindacene) BODIPY dye molecules embedded in Porous silicon (PSi) nanostructures produced by electrochemical anodization of p-type silicon wafers in an HF solution are investigated using ...
  • Frequency-resolved photoconductivity studies in amorphous chalcogenide films 
    Akat, Ercüment. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2000., 2000.)
    Frequency-resolved photocurrent measurements (FRPC) were carried out on amorphous chalcogenide films such as AsSeSb AsSe and AsSeTe, by a method called frequency-resolved spectroscopy (FRS) as a function of temperature ...
  • General unitary quantum groups and generalized Fermion algebras 
    Altıntaş, Azmi Ali. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2009., 2009.)
    Since the middle of the twentieth century, physicists have concentrated on finding quantum counterparts of classical systems. When a classical system is quantized its invariance group may still be a classical group. In the ...

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