Now showing items 1-9 of 9

    • An adhesion-dominated rolling Friction regime unique to micro-scale ball bearings 

      Hanrahan, Brendan M.; Misra, Saswat; Beyaz, Mustafa İlker; Feldman, Jeremy H.; Waits, Christopher M.; Ghodssi, Reza (Tribology Letters, 2014)
      We demonstrate that micro-scale rolling bearings exhibit friction and wear properties markedly different from their macro-scale counterparts. A microfabricated testing platform uses variable rolling element diameters or ...
    • Climate change impacts on meteorological drought using SPI and SPEI: case study of Ankara, Turkey 

      Danandeh Mehr, Ali; Sorman, Ali Ünal; Kahya, Ercan; Hesami Afshar, Mahdi (Hydrological Sciences Journal, 2019)
      Using regionally downscaled and adjusted outputs of three global climate models (GCMs), meteorological drought analysis was accomplished across Ankara, the capital city of Turkey. To this end, standardized precipitation ...
    • A compact energy transducer for power generation from respiration 

      Beyaz, Mustafa İlker; Habibiabad, Sahar; Yıldız, Hamza; Göreke, Utku; Azgın, Kıvanç (Journal of Microelectromechanical Systems, 2019)
      This paper reports a compact magnetic transducer developed for generating electrical power from respiration. The device incorporates a side-drive turbine rotor with embedded permanent magnets and two stators, integrated ...
    • The development and performance characterization of turbine prototypes for a MEMS spirometer 

      Göreke, Utku; Habibiabad, Sahar; Azgın, Kıvanç; Serinağaoğlu Doğrusöz, Yeşim; Beyaz, Mustafa İlker (IEEE Sensors Journal, 2016)
      The design, optimization, and performance characterization of turbine prototypes for the development of a Microelectromechanical Systems spirometer is reported. Four different turbines were designed based on large-scale ...
    • Hybrid magnetic-piezoelectric energy harvester for power generation around waistline from gait 

      Beyaz, Mustafa İlker; Tat, Fatih; Özkaya, Kamil Yunus; Özbek, Ramazan (Journal of Electrical Engineering & Technology, 2019)
      The development of a novel hybrid energy harvester for scavenging power around human waistline is presented. The harvester is composed of mm-scale electromagnetic coils and piezoelectric transducers incorporated on a belt, ...
    • An integrated permanent magnet Micro-turbo- generator supported on microball bearings 

      Beyaz, Mustafa İlker; Hanrahan, Brendan M.; Feldman, Jeremy H.; Ghodssi, Reza (Journal of Microelectromechanical Systems, 2013)
      This paper presents the design, fabrication, and testing of an integrated microturbogenerator utilizing permanent magnets and microball bearings. The key components of this generator are the following: 1) a silicon ...
    • An investigation on the electromagnetic design optimization of rotary micromachines with double-layer permanent magnets 

      Özkaya, Kamil Yunus; Beyaz, Mustafa İlker (Sensors and Actuators A: Physical, 2015)
      Electromagnetic design optimization of axial-flux rotary micromachines utilizing double-layer permanent magnets is presented and applied to a micro-scale generator/spirometer currently under development. Double-layer magnet ...
    • Monitoring of actuation conditions in a micro- turbo-generator 

      Beyaz, Mustafa İlker; Hanrahan, Brendan M.; Feldman, Jeremy H.; Ghodssi, Reza (IEEE Sensors Journal, 2013)
      This paper presents the theory and implementation of an integrated sensing technique for the real-time measurement of applied actuation conditions in a micro-turbo-generator. The device is composed of a microturbine rotor ...
    • A turbine-based MEMS sensor for spirometry with wearable devices 

      Beyaz, Mustafa İlker; Habibiabad, Sahar; Yıldız, Hamza; Göreke, Utku; Azgın, Kıvanç (IEEE Sensors Journal, 2019)
      This paper presents a turbine-based microelectromechanical systems (MEMS) sensor for spirometry application. The compact sensor dimensions allow integration into smart wearable devices for mobile spirometry without a ...