Browsing Mechanical Engineering by Author "2"
Now showing items 1-20 of 88
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3-D extension of chemical mechanical polishing for nano-structuring applications on alternative technologies
Özdemir, Zeynep; Başım, Gül Bahar (The Electrochemical Society, 2016)In this study we tune the chemical mechanical polishing process to a 3-D level to generate controlled nanostructures on functional metallic surfaces such as titanium implants and steel based heating elements. The chemical ... -
Acoustic analysis of an axial fan
Hashım, Hafız Muhammad; Dogruoz, M. B.; Arık, Mehmet (IEEE, 2017)Axial fans are often used in cooling electronic enclosures where low noise levels are highly demanded. Therefore, methods for predicting the noise emitted by an application including single or multiple fans are desirable ... -
An active brace for controlled transdermal drug delivery for adjustable physical therapy
Erol, Levent; Bebek, Özkan; Karagöz, Ayşe; Başım, Gül Bahar (IEEE, 2014)This study presents an active brace which is a cost efficient precision-controlled advanced therapy medicinal product for time and rate controlled transdermal drug delivery (TDD) through the use of drug containing nanoparticles ... -
Active-grid turbulence effect on the topology and the flame location of a lean premixed combustion
Alhumairi, Mohammed Khudhair Abbas; Ertunç, Özgür (Society of Thermal Engineers of Serbia, 2018)Lean premixed combustion under the influence of active-grid turbulence was computationally investigated, and the results were compared with experimental data. The experiments were carried out to generate a premixed flame ... -
Application of a disturbance observer based controller to improve vehicle ride
Şendur, Polat; Uğurlu, Regaip Barkan (Canadian Acoustical Association, 2019)In this paper the application of a disturbance observer based control algorithm is proposed to improve the vehicle ride performance of a vehicle that has magnetorheological damper (MR Damper) suspension. The vehicle is ... -
Application of a novel friction stir spot welding process on dissimilar aluminum joints
Bajilane, Isam Jabbar Ibrahim; Yapıcı, Güney Güven (Elsevier, 2018-10)Intermediate layer friction stir spot welding (IL-FSSW) is introduced in this study as a novel spot welding technique to eliminate the keyhole associated with the conventional friction stir spot welding (FSSW). This process ... -
Application of chemical mechanical polishing process on titanium based implants
Özdemir, Zeynep; Ozdemir, A.; Başım, Gül Bahar (Elsevier, 2016-11-01)Modification of the implantable biomaterial surfaces is known to improve the biocompatibility of metallic implants. Particularly, treatments such as etching, sand-blasting or laser treatment are commonly studied to understand ... -
Application of giesekus model for capillary extrusion of rubber compound
Talib, Nayyef Ahmed; Ertunç, Özgür (The Society of Chemical Engineers, 2019-02)Extrudate swell is an important phenomenon occurring when high viscoelastic materials, such as rubber and rubber compounds, are extruded. In this work, the effects of relaxation time and relaxation mode on swell predictions ... -
Biomaterials applications of chemical mechanical polishing
Başım, Gül Bahar; Özdemir, Zeynep; Mutlu, Ö. (IEEE, 2012)Chemical Mechanical Polishing (CMP) is used in semiconductor industry to enable planarization of the interlayer dielectrics and metals. In this study, CMP is used as a polishing technique to modify the surface roughness ... -
Characterization of nano-scale protective oxide films: application on metal chemical mechanical planarization
Karagöz, Ayse; Craciun, V.; Başım, Gül Bahar (The Electrochemical Society, 2015)This study focuses on the characterization of nano-scale metal oxide films for chemical mechanical planarization (CMP) applications. The protective nature of the self-grown metal oxide layers in the CMP slurry environment ... -
Chemical mechanical planarization studies on gallium nitride for improved performance
Karagöz, Ayşe; Başım, Gül Bahar; Siebert, M.; Leunissen, L. A. H. (IEEE, 2015)In this study, a systematic experimental approach has been followed to determine the conditions to promote material removal rate while controlling surface defectivity for GaN CMP. Silica based slurries were used to optimize ... -
Chemical mechanical polishing implementation on dental implants
Başım, Gül Bahar; Özdemir, Zeynep (IEEE, 2015)In this study, chemical mechanical polishing (CMP) technique is introduced as a new alternative to generate controlled nano/micro scale roughness on the titanium implant surfaces. It is known that micro scale patterns ... -
A comparative study on the junction temperature measurements of LEDs with raman spectroscopy, microinfrared (IR) imaging, and Forward voltage methods
Tamdoğan, Enes; Pavlidis, G.; Graham, S.; Arık, Mehmet (IEEE, 2018-11)Energy efficiency, long life, exceptional color, and performance of solid-state light sources have resulted in a rapidly increasing trend in a number of practical applications especially for general lighting after a long ... -
A comparison study on observer-based force control of series elastic actuators
Kansızoğlu, Ahmet Talha; Sariyildiz, E.; Uğurlu, Regaip Barkan (IEEE, 2018)This paper presents a comparison study for the robust force control of series elastic actuators (SEAs). In most robotics systems, SEAs are used as an essential actuation method due to the benefits such as lower reflected ... -
Computer simulations of 4240 MOF membranes for H2/CH4 separations: insights into structure–performance relations
Altintas, C.; Avci, G.; Daglar, H.; Gülçay, Ezgi; Fındıkçı, İlknur Eruçar; Keskin, S. (Royal Society of Chemistry, 2018-04-14)Design of new membranes having high H2/CH4 selectivity and high H2 permeability is strongly desired to reduce the energy demand for H2 production. Metal organic frameworks (MOFs) offer a great promise for membrane-based ... -
Controlling germanium CMP selectivity through slurry mediation by surface active agents
Karagöz, Ayşe; Başım, Gül Bahar (The Electrochemical Society, 2015-08-10)New developments and device performance requirements in microelectronics industry add to the challenges in chemical mechanical planarization (CMP) process. One of the recently introduced materials to semiconductor manufacturing ... -
Critical review of the factors dominating the fracture toughness of CNT reinforced polymer composites
Al-Maharma, Ahmad Yousef Mohammad; Şendur, Polat; Al-Huniti, N. (IOP Publishing, 2019-01)In this study, the main factors, which have substantial influence on fracture toughness of carbon nanotubes (CNTs)-based composites both at nano and macro scales, are discussed in detail. Based on the findings from the ... -
Cyclic deformation response of ultra-fine grained titanium at elevated temperatures
Sajadifar, Seyed Vahid; Yapıcı, Güney Güven; Demler, E.; Krooss, P.; Wegener, T.; Maier, H. J.; Niendorf, T. (Elsevier, 2019-05)This study focuses on the high-temperature cyclic deformation response (CDR) of ultra-fine grained (UFG) titanium of commercial purity (grade 4) processed via equal channel angular extrusion as a severe plastic deformation ... -
Development of 3-D chemical mechanical polishing process for nanostructuring of bioimplant surfaces
Özdemir, Zeynep; Orhan, Orçun; Bebek, Özkan; Başım, Gül Bahar (ECS, 2014)This study focuses on the development of a three dimensional chemical mechanical polishing (CMP) process to induce smoothness or controlled nano-roughness on the bio-implant material surfaces, particularly for an application ... -
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 ...
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