Ph.D. Theses: Recent submissions

  • 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 ...
  • Quantum phenomena and shape dynamics 
    Dündar, Furkan Semih. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    In this thesis, we considered quantum phenomena (Unruh effect) in Shape Dy namics, version of Bohmian Mechanics that is compatible with Mach’s Principle, and a solution (gravitational collapse of a spherically symmetric ...
  • Photoacoustic signal detection via atomic force microscopy cantilevers 
    Demirkıran, Aytaç. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    In this thesis, we first present a custom-designed photoacoustic microscopy system (PAM) which includes two separate excitation lasers. One of these tools is a novel fiber-based laser system developed particularly for ...
  • A new methodology for climate model selection and application to temperature, heat wave, WBGT and labor productivity analysis 
    Altınsoy, Hamza. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    In this thesis, the answers to four main research questions are sought. The first effort is about the finding the most accurate model combinations to project intended climate variables. A new methodology is proposed and ...
  • Photoacoustic signal characterization of cell morphology in microchannel flow 
    Uluç, Nasire. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    Photoacoustic (PA) imaging, a hybrid imaging modality, provides both functional and structural information of biological tissue by combining both optical imaging and ultrasound imaging. It takes advantages of high contrast ...
  • 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 ...
  • 3D optical profilometry using fiber optics lloyd's mirror method 
    Köseoğlu, Gülşen. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    A ber optic Lloyd's mirror assembly is investigated to obtain various optical interference patterns for the detection of three-dimensional shapes of rigid bodies. Two types of the ber optic Lloyds systems are used in ...
  • Physical modeling of drug transport in cancer 
    Yonucu, Şirin. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    Understanding the interaction of tumors with their microenvironment is imper ative to understand its development and to increase the efficiency of therapies. In addition to all other genetic and biochemical determinants of ...
  • Nonrelativistic limit of Bose-Einstein condensation in a static spacetime 
    İşeri, İslam Çağrı. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2018., 2018.)
    Nonrelativistic limit of thermodynamics of noninteracting Bose field in curved background is investigated via a post-Newtonian approach. In large but finite c limit matter becomes nonrelativistic whereas the geometry stays ...
  • 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 ...
  • Black holes in an expanding universe 
    Şenikoğlu, Yorgo. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    By performing transformations on the isotropic forms of di erent metrics, new cosmological black hole solutions were obtained by generalizing the static solution, the Schwarzchild solution, the McVittie and the Kerr ...
  • 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 ...
  • 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 ...
  • A hybrid optical tweezers and photoacoustic microscopy system 
    Kipergil, Esra Aytaç. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2017., 2017.)
    Photoacoustic microscopy (PAM) is a promising imaging modality that combines optical and ultrasound imaging. It takes advantage of high optical contrast and high ultrasonic spatial resolution. Conventionally, piezoelectric ...
  • On the history of expansion and matter - energy content of the universe 
    Çamlıbel, Ali Kazım. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2016., 2016.)
    The aim of this dissertation is to explore the vast phenomenological area between the cosmological observations and the theoretical approaches. We are speci cally focusing on type Ia supernova data and what they tell us ...
  • 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 ...
  • Modified theories of gravity via alternative couplings and their cosmological analyses 
    Kavuk, Mehmet. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2015., 2015.)
    We propose alternative gravitational couplings, fields and design some models to explain some cosmological problems. We investigate a cosmological model in which the Stueckelberg fields describing a massive photon are ...
  • Signs and magnitudes of Lyapunov exponents in continuous time dynamical systems 
    Birol, İnanç. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Sciences and Engineering, 1997., 1997.)
    Methods for algebraically determining the signs and the magnitudes of Lyapunov exponents of a given dynamical system are studied.A number of Hamiltonian and dissipative systems are investigated.The existence of zero ...
  • Search for axions with micromegas detectors in the cern cast experiment 
    Yıldız, Süleyman Cenk. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2013.)
    The CAST experiment is searching for the axion, which is a light, weakly interacting pseudoscalar particle, that is proposed to solve the so called Strong Charge-Parity Problem. The axions CAST is looking for are produced ...
  • Black holes and cosmic censorship 
    Düztaş, Koray. (Thesis (Ph.D.)-Bogazici University. Institute for Graduate Studies in Science and Engineering, 2013., 2014.)
    This thesis starts with a brief review of causality conditions, gravitational collapse and singularity theorems. Cosmic censorship conjecture is introduced and the need for such a conjecture to preserve the deterministic ...

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