Browsing Makine Mühendisliği Bölümü by Issue Date

Now showing items 1-20 of 144

A new algorithm for u-shaped two-sided assembly line balancing

Yegül, Mustafa Fatih; Agpak, Kürşat; Yavuz, Mustafa (CSME Trans, 2010)

This study introduces a new hybrid design for a specific case-of assembly lines, and proposes a multi-pass random assignment algorithm to find the minimum number of stations required. The algorithm also finds the sequence ...
An Electrostatically Actuated Parylene Microvalve for Lab-On-A-Chip Applications

Yıldırım, Ender; Arıkan, M. A. Sahir; Kulah, Haluk (2011)

This paper presents a novel electrostatic microvalve to control in-plane flow on parylene based lab-on-a-chip-devices. Normally-closed design of the microvalve insulates the working fluid from the electric field, while ...
Numerical analysis of a commercial display cabinet with air curtain

Çalışkan, Sinan; Altunok, Taner; Başkaya, Şenol; Güngüneş, H. Murat (2011-06)

Maintaining food temperatures below critical values is the important maximising the high quality display life of chilled foods. Air curtains are especially used in stores and retailer supermarkets as barrier systems to ...
Analysis and characterization of an electrostatically actuated in-plane parylene microvalve

Yıldırım, Ender; Kulah, Haluk (IOP Publishing LTD, 2011-10)

This paper presents analysis and implementation of a simple electrostatic microvalve designed for use in parylene-based lab-on-a-chip devices. The microvalve utilizes an in-plane collapsing diaphragm. To investigate the ...
A Droplet Based Multi-Drug Screening System Controlled With Electrostatic Microvalves

Yıldırım, Ender; Özgür, E.; Kulah, Haluk (Chemical and Biological Microsystems Society, 2012)

This paper presents a droplet-based drug effect analysis system utilizing electrostatically-actuated normallyclosed microvalves to screen the effect of multiple drugs on a single type of cell. Proposed system minimizes the ...
MEMS Malzeme karakterizasyonu için bütünleşik bir elektrostatik mikro bükülme test yapısı tasarımı ve gerçekleştirilmesi

Yıldırım, Ender; Akın, Tayfun; Arıkan, M. A. Sahir (Çankaya Üniversitesi, 2012)

Mikro elektromekanik sistemlerde kullanılan malzemelerin mekanik özelliklerinin, üretim yöntemleri nedeniyle, mikro boyuttaki test yapılarıyla tespit edilmesi gerekmektedir. Bu çalışmada, eyleyici, test numunesi ve ölçüm ...
Yamuk kesitli kanal içerisinde hidrodinamik olarak tam gelişmiş ısıl olarak gelişmekte olan laminer akış ve ısı transferinin sayısal olarak incelenmesi

Onur, Nevzat; Arslan, Kamil; Turgut, Oğuz (Çankaya Üniversitesi, 2012)

Bu çalışmada yamuk kesit alanına sahip bir kanal içerisindeki hidrodinamik olarak tam gelişmiş ısıl olarak gelişmekte olan üç boyutlu zorlanmış konveksiyon akış ve ısı transferi kararlı rejim ve sabit yüzey sıcaklığı ...
Electrostatic energy harvesting by droplet-based multi-phase microfluidics

Yıldırım, Ender; Kulah, Haluk (Springer Heidelberg, 2012-07)

This paper presents an energy scavenging technique, merging microfluidics with electrostatic energy harvesting. The method employs droplet-based microflow of two phases with different electrical permittivities, resulting ...
A normally closed electrostatic parylene microvalve for micro total analysis systems

Yıldırım, Ender; Arıkan, M. A. Sahir; Kulah, Haluk (Elsevier Science SA, 2012-07)

This paper presents an electrostatically actuated, normally closed microvalve for parylene microfluidics. The proposed valve structure isolates the fluid from the electric field, and hence results in relatively low actuation ...
A Reconfigurable Microfluidic Transmitarray Unit Cell

Erdil, Emre; Topallı, Kağan; Zorlu, Özge; Toral, Taylan; Yıldırım, Ender; Kulah, Haluk; Aydın Çivi, Özlem (IEEE, 2013)

This paper presents a novel microfluidics based approach to develop a reconfigurable circularly polarized transmitarray unit cell. The unit cell comprises double layer nested split ring slots formed as microfluidic channels ...
Hasar toleransında parametrik analiz-devir sayma tekniğinin etkisi

Akyürek, Turgut (Çankaya Üniversitesi, 2013)

Bu makalede hasar toleransında etken olan önemli parametrelerin hasar tolerans ömürleri üzerine etkileri çalışması kapsamında yük devirlerini sayma yönteminin yorulma çatlağı büyümesi tahminlerine etkileri analiz edilerek, ...
Phaseguide assisted liquid lamination for magnetic bead-based assays

Phurimsak, Chayakom; Yıldırım, Ender; Trietsch, Sebastiaan J.; Hankemeier, Thomas; Tarn, Mark D.; Pamme, Nicole; Vulto, Paul (2013)

We demonstrate a simple, pump-free platform for performing rapid magnetic bead-based processes via their transfer through sequentially laminated liquid streams, made possible by the use of phaseguide technology. We have ...
Empirical and statistical modeling of heat loss from surface of a cement rotary kiln system

Şimşek, Barış; Şimşek, Emir H.; Altunok, Taner (Gazi University, Fac Engineering Architecture, 2013-03)

In branches of industry too much energy consuming such as cement sector, controlled use of energy, only it is possible to know how energy is distributed in the system. In cement production process, a large portion of the ...
Experimental and numerical investigation of transition to turbulent flow and heat transfer inside a horizontal smooth rectangular duct under uniform bottom surface temperature

Onur, Nevzat; Arslan, Kamil (Springer, 2013-07)

In this study, steady-state turbulent forced flow and heat transfer in a horizontal smooth rectangular duct both experimentally and numerically investigated. The study was carried out in the transition to turbulence region ...
Development and experimental investigation of electrochemical drilling method using rotary tube tool

Özerkan, H. Bekir; Çoğun, Can (Gazi University, Fac Engineering Architecture, 2013-12)

In this study, a new hybrid electrochemical drilling (ECD) method, based on electrochemical machining in nonconventional machining processes, was developed. In the developed method, tube tool makes rotary motion together ...
Hybrid force and motion control of flexible joint parallel manipulators using inverse dynamics approach

Korkmaz, Ozan; İder, Sıtkı Kemal (Taylor&Francis Ltd, 2014)

An inverse dynamics control algorithm is developed for hybrid motion and contact force trajectory tracking control of flexible joint parallel manipulators. First, an open-tree structure is considered by the disconnection ...
Phaseguide assisted liquid lamination for magnetic particle-based assays

Phurimsak, Chayakom; Yıldırım, Ender; Tarn, Mark D.; Trietsch, Sebastiaan J.; Hankemeier, Thomas; Pamme, Nicole; Vulto, Paul (Royal Soc Chemistry, 2014)

We have developed a magnetic particle-based assay platform in which functionalised magnetic particles are transferred sequentially through laminated volumes of reagents and washing buffers. Lamination of aqueous liquids ...
Phaseguides as tunable passive microvalves for liquid routing in complex microfluidic networks

Yıldırım, Ender; Trietsch, Sebastiaan J.; Joore, Jos; Van Den Berg, Albert; Hankemeier, Thomas; Vulto, Paul (Royal Soc Chemistry, 2014)

A microfluidic passive valving platform is introduced that has full control over the stability of each valve. The concept is based on phaseguides, which are small ridges at the bottom of a channel acting as pinning barriers. ...
Effect of alkali treatment parameters on surface structure and mechanical properties of porous Ti6A17NB scaffolds

Bütev Öcal, Ezgi; Yeni, Elif Eda; Yılmaz, Emre; Esen, Ziya; Bor, Şakir (2014)

In the present study, highly porous Ti6Al7Nb alloy scaffolds having 70% pore contents with 200-250 µm average pore size were produced through the spacer holder technique as a result of evaporation of Mg powder from the ...
R 236fa Kullanılan Bir Ejektör İçerisindeki Türbülanslı Akış ve Isı Transferinin Sayısal Olarak İncelenmesi

Deniz, Emrah; Arslan, Kamil; Mulcar, Hasan; Onur, Nevzat (2014)

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