Fen Bilimleri Enstitüsü: Recent submissions

  • On the hypersurfaces in toric varieties 
    Barış, İlayda. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Theory of toric varieties provides fruitful interactions between algebraic geom etry and combinatorics. It is remarkably fertile in terms of connections with many areas of mathematics and has plentiful applications to other ...
  • The question of model companionability : positive and negative answers 
    Berksoy, Feyza Nur. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Model companion ofa universal theory T is the axiomatization of the existentially closed models of T. This thesis studies the concept of model companionability of theories. We present examples of model companions of certain ...
  • Global well-posedness of NLS equations 
    Yılmaz, Oğuz. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    The thesis is a survey of the I-method. After introducing the method, we discuss the implementation of this method to cubic, defocusing nonlinear Schrödinger equation in the spatial dimension n = 2 and quintic, defocusing ...
  • Covariance estimation of spatio-temporal random variables with kronecker product based models 
    Dağıdır, Can Hakan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Covariance estimation is a widely studied topic. Due to the nature of many prob lems, high-dimensional Spatio-temporal scenarios are considered frequently. In some cases, the true covariance matrices are also expected to ...
  • Turbulent combustion modelling of fuels using LES 
    Güryuva, Serdar. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Combustion simulations with high fidelity turbulence models and detailed chemistry may suffer from high computational power requirements due to the combined cost of time-scale dissipation and small integration steps. Such ...
  • Adaptive boundary control using backstepping for 1D variable length string-mass system under disturbances 
    Szczesiak, Mateusz. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    In this thesis, an adaptive boundary control using delayed control methodology for a 1D wave equation is examined. The outlined problem is applied in the control of an ideal string- mass system with constant or time-varying ...
  • Nonlinear viscoelastic material modeling using nested linkage mechanisms 
    Özcan, Mustafa Umut. (Thesis (Ph.D.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    In this study, basic linear lumped elements such as springs and dashpots are used in nested linkage mechanisms in order to simulate and predict the mechanical behaviour of nonlinear viscoelastic materials. The proposed ...
  • Analysis of crack initiation in edge cracked NiTi shape memory alloy plate 
    Baykara, Onat. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Shape Memory Alloys (SMAs) are getting more known among scientist and the engineers day by day. Therefore, their industrial, military and also daily life applications are increasing. Their unique properties make them very ...
  • Design, production and testing of a micro scale ORC 
    Bayraktar, Berkhan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Energy efficiency and renewable energy technologies are becoming more and more important every day. Organic Rankine Cycle is a proven way of generation of power from low temperature heat sources. In this study a 1 kW ...
  • Plasmonic enhancement of absorption efficiency of nanoparticles for photothermal therapy applications 
    Tahmaz, Ege Şükrü. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Even though humanity is in a golden age when it comes to medical wonders, can cer is still one of the most common and deadly diseases in the world. One new treatment method is called photothermal therapy, which is the ...
  • Optimum design of stiffened composite cylindrical shells with a cutout for maximum buckling strength 
    Değer, Sezer. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Thin-walled composite cylindrical shells have low resistance to buckling and out-of-plane deformations. Introducing a cutout to these structures reduces the load-carrying capacity of such structures drastically. One effective ...
  • Modified numerical method for thin film thermal conductivity calculation with micro-raman spectroscopy 
    Meydando, Taher. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Thin film materials have recently drawn a great attention for their wide range of applications in nano- and micro-scale devices. To overcome thermal issues associated with these devices, thin film materials must be ...
  • Ultrawide stop band in a 3D elastic metamaterial with inertial amplification mechanisms having cross flexure hinges 
    Otlu, Sedef Nisan. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Inertial amplification is a new method to obtain phononic band gaps in peri odic structures. The aim in this thesis is to obtain an ultrawide stop band in three dimensions by using inertial amplification mechanisms. In ...
  • Experimental and numerical analysis of foam-filled composite structures subjected to axial crushing 
    Demir, Serdar. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Crash components in transport vehicles are significant structures for the application of the composite materials due to their high energy absorption capacities. Even better energy absorption values can be achieved by foam ...
  • Resource-aware cooperative delivery mission planning for UAV and AGV 
    Zabun, Ali Naci. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    In this study, a problem related to cooperative delivery mission planning of an unmanned aerial vehicle (UAV) and an autonomous ground vehicle (AGV) is con sidered. The problem is a new sub- variant of the Traveling Salesman ...
  • Design and implementation of a model predictive trajectory tracking controller for a quadcopter 
    Salman, Kübra Hilal. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    In this study, a trajectory tracking controller was designed for a quadcopter unmanned aerial vehicle (UAV), and its performance was evaluated by performing the necessary flight tests. As the controller approach, the model ...
  • Design and analysis of ultrawide elastic metamaterial for three- dimensional vibration isolation 
    Acar, Berkay. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Metamaterials are materials that are modified to bring in particular desired properties that are not inherited from original substance. Using number of techniques, materials can be engineered to have completely different ...
  • Current crowding effects on the thermal performance of AlGaN 
    Göktepe, Emine. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    In the areas, such as automotive, outdoor, and building lighting in which high brightness is very significant, high lumen AlGaN/ GaN light emitting diodes (LED) are preferred due to their low energy consumption vs high ...
  • Dynamic modeling of organic rankine cycle and its experimental verification 
    Altun, Ertuğrul. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Renewable energy technologies and waste heat recovery systems have become more important all around the world because of global warming, global climate change, and countries' tendency to decrease fossil fuel consumption. ...
  • Quantitative non-destructive characterization of defects in electronic packages using fuzzy inference based thermal tomography 
    Muratoğlu, Çağdaş. (Thesis (M.S.) - Bogazici University. Institute for Graduate Studies in Science and Engineering, 2022., 2022)
    Thermal challenges have been a roadblock for electronic packaging with the in creasing number of transistors and smaller package sizes. Thermal interface material (TIM) layers play a key role in heat dissipation at all ...

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