Browsing Mechanical Engineering by Author "Özyeğin University"
Now showing items 101-120 of 459
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Development of a computational modeling and experimental validation approach for KSF LED packages in a 65” ultra thin LED TV system
Elibol, M.; Özaydın, M. Ç.; Arık, Mehmet (IEEE, 2018-07-24)The customer expectations in global TV market have changed over the last decade significantly towards a thinner with a higher brightness and a wider color gamut (WCG) TV products. These requirements led to a drastic increase ... -
Development of an antagonistically actuated smart joint
Vahidyeganeh, Ali; Şimsek, Görkem Muttalip; Jabeen, Saher; Bebek, Özkan; Yapıcı, Güney Güven (Trans Tech Publications, 2017)Shape memory alloys with their phase transformation properties; have been broadly implemented in smart structures. In this study, a functional design is presented where two wires actuate antagonistically to achieve motion ... -
Development of figure of merits for energy efficient LED lighting systems
Inan, Muhammed Nasir; Arık, Mehmet (IEEE, 2014)Energy has been identified as one of the most important problems during the last few years. While energy generation and new energy resources are critical, energy efficiency in production, transportation and utilization are ... -
Direct liquid cooling of high flux LED systems: hot spot abatement
Tamdoğan, Enes; Arık, Mehmet; Doğruöz, M. B. (ASME, 2013)With the recent advances in wide band gap device technology, solid-state lighting (SSL) has become favorable for many lighting applications due to energy savings, long life, green nature for environment, and exceptional ... -
Direct numerical simulation of synthetic jet coupled to forced convection cooling in a channel flow
Azarifar, M.; Arık, Mehmet (IEEE, 2023)A synthetic jet (SJ) is a microfluidic device that uses the 'zero-net-mass-flux' concept to create a compact cooling solution and provide a net positive momentum flux to the local environment. SJs have been studied extensively ... -
Discrete dipole approximation of gold nanospheres on substrates: considerations and comparison with other discretization methods
Loke, Vincent L. Y.; Donev, E. U.; Huda, G. M.; Hastings, J. T.; Mengüç, Mustafa Pınar; Wriedt, T. (AAPP Physical, Mathematical, and Natural Sciences, 2011)We embark on this preliminary study of the suitability of the discrete dipole approximation with surface interaction (DDA-SI) method to model electric field scattering from noble metal nano-structures on dielectric substrates. ... -
Discrete phase analysis of self heating particles over an immersion liquid cooled high power blue light-emitting diode with suspended phosphor particles
Cengiz, Ceren; Muslu, Ahmet Mete; Azarifar, Mohammad; Arık, Mehmet; Dogruoz, B. (ASME, 2022-10)In recent years, the interaction of unrestricted particles with dispersed multiphase flows has been linked to a number of important engineering applications. Among these applications, the novel idea of immersion-cooled ... -
Discrete-dipole approximation with surface interaction: computational toolbox for MATLAB
Loke, Vincent L. Y.; Mengüç, Mustafa Pınar; Nieminen, T. A. (Elsevier, 2011-07)We describe a MATLAB toolbox that utilizes the discrete-dipole approximation (DDA) method for modelling light interaction with arbitrarily-shape scatterers in free space as well with planar surface interaction (DDA-SI). ... -
Discrete-time integral sliding mode control of a smart joint for minimally invasive surgeries
Jabeen, Saher; Yeganeh, Ali Vahid; Şimsek, Görkem Muttalip; Yapıcı, Güney Güven; Abidi, K.; Bebek, Özkan (IEEE, 2016)In this work, a shape memory alloy(SMA) actuator based joint (smart joint) is controlled using a discrete-time integral sliding mode (DISM) control to guide the motion of an active catheter. Controller is designed on the ... -
Dynamic opto-electro-thermal characterization of solid state lighting devices: measuring the power conversion efficiency at high current densities
Azarifar, Mohammad; Cengiz, Ceren; Arık, Mehmet (IOP Publishing, 2022-09-22)Solid state lighting devices with high power densities require accurate characterization, as the rise of chip temperature impacts its optical, electrical, and lifetime characteristics. A detailed experimental study is ... -
Editorial
Stoop, J.; Mishchenko, M. I.; Mengüç, Mustafa Pınar; Rothman, L. S. (Elsevier, 2011-09) -
Effect of a multi-phase structure on the damping response of a novel high entropy alloy
Işıl, Canay; Radi, Amin; Seyedmohammadi, Seyedveghar; Yapıcı, Güney Güven (Elsevier, 2022-12-01)In this study, dynamic behavior of a novel multi-phase high entropy alloy (HEA) was investigated. Thermo-mechanical processes containing an 80 % thickness reduction at room temperature rolling followed by annealing at 750 ... -
Effect of actuator deflection on heat transfer for low and high frequency synthetic jets
Ikhlaq, Muhammad; Ghaffari, Omidreza; Arık, Mehmet (IEEE, 2014)Synthetic jets are being investigated over the last four decades. Researchers have been interested in its unique applications for a wide range of flow control to thermal management of electronics applications. Synthetic ... -
Effect of aging on the mechanical behavior of aluminum-steel composites processed by accumulative roll bonding
Tahir, Furqan; Yapıcı, Güney Güven (Elsevier, 2021)Severe plastic deformation (SPD) processes have been widely used to provide ultrafine-grained (UFG) structures along with enriched strength in various metals. This study focuses on accumulative roll bonding (ARB), an SPD ... -
Effect of boronizing and WC coating on the high temperature mechanical behavior of AISI 321 stainless steel
Bilgin, Onur; Yapıcı, Güney Güven (Trans Tech Publications Ltd, 2022)In the current paper, the effect of two different coating techniques of boronizing and tungsten carbide (WC) coating on the room and high temperature tensile behavior of the AISI 321 stainless steel were investigated. ... -
Effect of build parameters on the compressive behavior of additive manufactured CoCrMo lattice parts based on experimental design
Gülcan, O.; Simsek, U.; Çokgünlü, Okan; Özdemir, Mirhan; Şendur, Polat; Yapıcı, Güney Güven (MDPI, 2022-07)Due to their high specific strength, toughness, and corrosion and wear resistance characteristics, CoCrMo alloys are widely used in different industries and applications: wind turbines and jet-engine components, orthopedic ... -
Effect of chemical mechanical polishing on surface nature of titanium implants FT-IR and wettability data of titanium implants surface after chemical mechanical polishing implementation
Özdemir, Zeynep; Başım, Gül Bahar (Elsevier, 2017)Bioactivity of titanium depends on the quality and characteristics of its surface oxide film. Through implementation of chemical mechanical polishing (CMP) process on titanium plates, a protective oxide (titania) film grows ... -
Effect of coating method on the surface characteristics of niti shape memory alloy
Şimşek, Görkem Muttalip; İpekoğlu, M.; Yapıcı, Güney Güven (Trans Tech Publications Ltd, 2020)Metallic materials including stainless steel, cobalt-chromium alloys, titanium and its alloys, and nickel-titanium (NiTi) shape memory alloys have been used in biomedical applications since the 1940s due to their favorable ... -
Effect of commercial purity levels on the mechanical properties of ultrafine-grained titanium
Purcek, G.; Yapıcı, Güney Güven; Karaman, I.; Maier, H. J. (Elsevier, 2011-03-15)Two grades of commercial purity (CP) titanium (grades 2 and 4) were processed using equal-channel angular extrusion (ECAE) at 300 ◦C and 450 ◦C, respectively. The processing temperatures were the minimum temperatures at ... -
The effect of curvic coupling joints on the roto rdynamic characteristics of gas turbines with tie-shaft
Şimşek, Uğur; Şendur, Polat; Yaşar, A. (Canadian Acoustical Association, 2019)The importance and use of curvic coupling joints are garnering interest in many aero-engine rotordynamics applications thanks to their benefits such as lower stress, higher service life, reliable positioning, precise ...
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