Browsing Mechanical Engineering by Author "2"
Now showing items 61-80 of 88
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Low-loss optical switch using Brewster angle
Kaykısız, Mustafa; Bulgan, Erdal (IEEE, 2011)Fabrication and actuation errors of submicron silicon waveguide optical switches are reported to remain within sub-100 nm ranges. These errors cause high loss ruining the optical performance of the switches at the on-state. ... -
Metal oxide thin film characterization for new generation chemical mechanical planarization development
Başım, Gül Bahar; Karagoz, Ayşe (The Electrochemical Society, 2016)This study targets to create a basis for the process development in the new generation semiconductor industry dealing with atomic scale devices. We focus on the CMP process development as it is used for the current and ... -
Nano-boron as an antibacterial agent for functionalized textiles
Akbar, Wazir; Karagöz, Ayşe; Başım, Gül Bahar; Noor, M.; Syed, T.; Lum, J.; Unluagac, M. (Cambridge University Press, 2015-01)The antibacterial properties of boron-containing compounds are well known although there are limited studies available on the pure boron nanoparticles. In this study boron nano-particles were characterized in terms of their ... -
Natural convection immersion cooling with enhanced optical performance of light-emitting diode systems
Tamdoğan, Enes; Arık, Mehmet (2015-10-15)Electronics driven at high currents may experience local hot spots, which may cause thermal degradation or even catastrophic failures. This common problem occurs at light-emitting diode (LED) chips and it is not easily ... -
Needle localization using gabor filtering in 2D ultrasound images
Kaya, Mert; Bebek, Özkan (IEEE, 2014)In the percutaneous needle procedures using ultrasound (US) imaging, the needle should be detected precisely to avoid damage to the tissue and to get the samples from the appropriate site. Excessive artifacts and low ... -
A new model for predicting the required pressure difference for pressure swirl atomizers
Nural, Ozan Ekin; Ertunç, Özgür; Hacıbekir, T.; Savcı, İ. H. (Europe, Institute for Liquid Atomization and Spray Systems, ILASS, 2020)Prior to this study an investigation is made to analyze the accuracies of the semi-empirical correlations of the previous studies by comparing them with a large number of experimental data which is extracted from the works ... -
Numerical and experimental analysis of a heat-pipe-embedded printed circuit board for solid state lighting applications
Salem, Thamer Khalif; Khosroshahi, F. S.; Arık, Mehmet; Hamdan, M. O.; Budakli, M. (Taylor & Francis, 2019-01-02)Thermal management is one of the main issues for electronics cooling especially for tightly packaged PCBs that experience local heat generation. Thus, theoretical and experimental investigations have been conducted to ... -
Numerical assessment of the factors controlling the acoustic response of wind turbine blades
Al-Maharma, Ahmad Yousef Mohammad; Şendur, Polat (Canadian Acoustical Association, 2019)The blades of wind turbine are the most critical parts of the wind turbine system, which contribute to noise generated by wind turbine due to excitation from air streams across them. In this numerical study, the effect of ... -
Numerical investigation of multiphase flow inside a pressure swirl atomizer at the initial stage of injection
Razeghi, Alireza; Ertunç, Özgür (Begell House Inc., 2018)Pulse-mode operating atomizers are widely used in industry. This paper presents the fluid flow details and characteristics inside a pulse-mode operating pressure swirl atomizer (PSA). Transient flow simulations are performed ... -
Numerical investigation of the flame location of turbulent premixed combustion in a diffuser burner exposed to various turbulence intensities and turbulence length scales
Nazzal, Ibrahim Thamer; Ertunç, Özgür (Turkish Society of Thermal Science and Technology (TIBTD), 2018)This study aims to investigate the response of the flame location of a turbulent premixed flame that has been exposed to various turbulence intensities and turbulence length scales. A diffuser-type burner is used to reveal ... -
A numerical study of a single unsteady laminar slot jet in a confined structure
Ghaffari, Omidreza; Doğruöz, M. B.; Arık, Mehmet (ASME, 2013)With the inherit advantages of air cooling, jet impingement can produce a factor of two or higher heat transfer than conventional fan flow over bodies. Therefore, impinging jets can solve a number of electronics thermal ... -
On occupant behavior and innovation studies towards high performance buildings: a transdisciplinary approach
Keskin, Cem; Mengüç, Mustafa Pınar (MDPI, 2018-10-06)With ever-increasing population and urbanization, it is crucial to decrease energy density in the built environment without sacrificing occupants’ comfort and well-being. This requires consideration of technological ... -
Optimization of the intermediate layer friction stir spot welding process
Bajilane, Isam Jabbar Ibrahim; Yapıcı, Güney Güven (Springer Nature, 2019-09)Friction stir spot welding was performed for joining sheets of 2024 and 6061 aluminum alloys, which is otherwise difficult using conventional welding techniques. The presented approach utilizes an intermediate layer to ... -
Parametric studies on vibration characteristics of triply periodic minimum surface sandwich lattice structures
Şimşek, Uğur; Arslan, T.; Kavas, B.; Gayir, C. E.; Şendur, Polat (Springer Nature, 2020-10-07)Additive manufacturing has opened new avenues for the manufacturing of structures to achieve challenging engineering tasks. Gyroid, a unique example of such structures, exhibits many attractive properties, such as high ... -
Predicting the performance of pressure-swirl atomizers
Nural, Ozan Ekin; Ertunç, Özgür (Begell House Inc., 2018)The purpose of this study is to evaluate the semiempirical correlations that are found in the literature by comparing them with all of the applicable experimental data that are also taken from the literature. Presentation ... -
Radiative energy and exergy analyses of spectrally-selective surfaces for CSP systems
Mohammed, Hayder Noori; Mengüç, Mustafa Pınar (Inderscience Enterprises Ltd., 2018)This work presents a new methodology for calculations of spectral radiative energy and radiative exergy to evaluate the performances of concentrated solar power (CSP) systems. Spectral radiative properties and the operating ... -
Review of the main factors controlling the fracture toughness and impact strength properties of natural composites
Al-Maharma, Ahmad Yousef Mohammad; Şendur, Polat (IOP Publishing, 2019-02)The main critical factors, which have direct influence on the fracture toughness and imapct strength properties of natural fibers composites, are reviewed in details in this paper. Considering the vast body of literature ... -
Solar radiation exergy and quality performance for Iraq and Turkey
Mohammed, Hayder Noori; Mengüç, Mustafa Pınar (Inderscience Enterprises Ltd., 2018)The present study is conducted with two primary objectives: First, a new formulation for the maximum efficiency of the solar radiation conversion is developed by considering the radiative energy transfer between two surfaces ... -
Study on the refrigerator bottom cabinet cavity acoustic behavior
Öztürk, Anıl; Yapıcı, Güney Güven (International Institute of Acoustics and Vibrations, 2014)Recently, sound comfort has become important in residential houses and noise emission is a distinctive feature for the selection of the home appliances in the same energy class. Refrigerators run continuously when it is ... -
Surface characterization driven CMP optimization for gallium nitride
Karagoz, Ayşe; Siebert, M.; Leunissen, P.; Başım, Gül Bahar (ECS, 2016)Gallium nitride is a hard and chemically inert material demoting high material removal rates in the chemical mechanical planarization (CMP) applications. This paper focuses on the optimization of the process conditions to ...
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