Boğaziçi Üniversitesi Tezleri: Recent submissions

  • Development of a model-based auto-calibration methodology with genetic algorithms focusing on fuel efficiency and emission compliance over real-world driving cycles 
    Karabıyık, Egemen. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    The aim of this study is to develop a methodology for the optimization of a diesel engine calibration in terms of fuel consumption while being emission compliant for a predefined route by using model-based calibration ...
  • A strain energy based multiaxial high-cycle fatigue life evaluation model for notched structures 
    Gezer, Burak. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    In this study, a model is presented for high-cycle fatigue-life assessment of notched engineering components subjected to constant amplitude multiaxial proportional loads. The algorithm requires only material-dependent ...
  • Description of local chemical environments in machine learning potentials using spherical bessel descriptors 
    Köçer, S. Emir. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    Molecular dynamics is an e ective numerical simulation technique for investigating material behavior at an atomistic scale, where simulated motions of atoms and molecules within a physical system are governed by Newtonian ...
  • Finite element analysis of elastomeric bearings under compression and shear loading 
    Aynur, Mert Can. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    Elastomeric bearings are widely used as isolators for buildings and bridges. Elastomeric bearings may be either stratified structures with repeated parallel layers of rubber and steel or plain rubber. This thesis focuses ...
  • Finite element solution of MHD duct flows 
    Egeli, Osman. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1981., 1981.)
    In the present study a finite element Galerkin method is presented for the solution of MHD duct flows. The electromagnetic theory is used to derive the body force term in the Navier - Stokes equation and the ohmic dissipation ...
  • Modeling localized heating induced size effects in semiconductor devices 
    Dündar, Canberk. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    Micro and nano scale semiconductor devices could undergo localized self-heating that obscures phonon transport and leads to size e ects and peak device temperatures. Consequently, device performance and lifetime are degraded. ...
  • Phonon mean free path and thermal conductivity analysis of wide and ultra-wide bandgap materials 
    Albar, Esra İlke. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    As the Knudsen number (de ned as the as the ratio of the molecular mean free path length to length scale of the device) increases, materials' thermal properties are compromised due to disruption of phonon movement. If the ...
  • Accurate thermal characterization and optimization of high lumen led array fixtures 
    Kundakçıoğlu, Haluk. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2020., 2020.)
    High lumen light emitting diode (LED) arrays have been preferred in di erent applications due to their low energy consumption. To maintain the performance of LEDs, heat generated by the LED chips should be removed e ectively. ...
  • Environment recognition for context-dependent control of powered exoskeletons 
    Karacan, Kübra. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    The daily use of advanced wearable robotic devices for the assistance of people with locomotive disabilities is still facing clear limitations in usability and acceptance. In most devices, the correct selection and initiation ...
  • Heat transfer and flow behavior of carbon based nanofluids 
    Demirkır, Çayan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    Thermal and rheological behaviors of the graphene-water nano uids are investigated experimentally. Nano uids with particle mass fraction from 0.025 to 2.0% are prepared by using PVP as surface active material and ...
  • Design of a passive self-tuning lever-type vibration isolation system 
    Özyar, Ahmet Onur. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    In this study, a novel self-tuning passive lever-type vibration isolation system for base excitations is described. Due to inertial coupling within the vibration isolation system, an antiresonance frequency is generated, ...
  • Fast NOx prediction methodology via 1D thermodynamical tools 
    Özgül, Emre. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    Accurate modelling of Nitrogen Oxide, soot, CO and UHC emissions from diesel engines plays a crucial role during the development phases of powertrain systems due to increasingly more strict emission legislation. Undoubtedly, ...
  • Design of a highly-extensible pneumatic actuator for soft robotic applications 
    Baydere, Bora Alp. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    Soft continuum robots have been an expanding research topic due to their in herent compliance and flexibility. However, most of the conventional continuum robots still lack the ability to significantly change size and length. ...
  • Finite element analysis of flow between two finite coaxial rotating disks 
    Benim, Ali Cemal. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 1981., 1981.)
    In this study, the steady and incompressible flow between rotating,coaxial, finite disks is solved by the Finite Element Method. In the analysis velocity and pressure formulation is used. An iterative procedure which permits ...
  • Effect of loading rate and thermomechanical coupling on fracture of shape memory alloys 
    Özbaş, İsmail Yiğit. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    This work is on the investigation of the effect of loading rate and thermomechan ical coupling on mechanical behavior and fracture of shape memory alloys (SMA). The constitutive model of Zaki and Moumni (ZM) is studied in ...
  • Effect of air flow, water spray and nozzle injection characteristic on direct evaporative cooling 
    Shafiei, Hamed. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    Evaporative cooling occurs through evaporation of water droplets in air. It works on the principle of injecting water spray directly into the air flow to reduce its temperature by a conversion of sensible heat of the air ...
  • Design and implementation of a parabolic trough collector system 
    Bilgin, Egemen Orhan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    With the effect of global warming on weather, most countries are interested in renewable energy sources and solar energy is the most promising one among others with an endless source. With this awareness, a lab scale test ...
  • Thermodynamic modelling and experimental validation of a laboratory scale ORC scroll expander 
    Ogan, Doruk Can. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    The detailed geometrical and thermodynamic modelling and experimental vali dation of scroll expander is presented in this thesis. Firstly, a fully mathematical model is developed for moving and fixed scrolls inside the ...
  • Optimum design of a sandwich plate with egg-crate shaped core for maximum strength under three-point bending 
    Yalkılıç, Coşkun. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    This thesis study aims to maximize the bending strength of a sandwich composite plate with an egg-crate shaped core under three-point bending loading. The material is chosen as epoxy-reinforced with non-crimp E-glass fabric ...
  • Local field enhancement of different core shell nano-particles placed over a substrate under an AFM tip 
    Avşar, Dilan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2019., 2019.)
    Metal nanoparticles (NPs) interacting with the light in near-field undergoes lo calized surface plasmon resonance (LSPR) when the oscillating charges on the surfaces resonates with the incident light frequency. The EM wave ...