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Numerical Fresnel models of Fresnel zone plates for plane wave at angle of incidence Ünal, Ahmet (2025-12-01) Diffractive optical elements (DOEs) are increasingly used in electro-optical systems due to their design flexibility, which offers advantages over refractive optics. Although determining the point spread function (PSF) is ...
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Temperature-dependent evolution of Al-Ge microstructures for wafer-level vacuum packaging of MEMS devices Dimez, Bekir Gürel; Akın, Tayfun; Kalay, Yunus Eren (2025-04-01) This paper reports the temperature dependency of eutectic aluminum-germanium (Al-Ge) microstructures that can be used for complementary metal-oxide semiconductor (CMOS)-compatible wafer-level vacuum packaging of microelect...
Common Aperture DSLR Camera Design Approach with Diffractive Lens Ünal, Ahmet (Gazi Universitesi Fen Bilimleri Dergisi Part C: Tasarim ve Teknoloji, 2025-3-24) Digital Single-Lens Reflex (DSLR) cameras have widespread applications across various fields. Yet, their reliance on eyepieces poses limitations on their functionality. To address this constraint, a comprehensive optical s...
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Deep plug-and-play HIO approach for phase retrieval Işil, Çağatay; Öktem, Sevinç Figen (2025-02-10) In the phase retrieval problem, the aim is the recovery of an unknown image from intensity-only measurements such as Fourier intensity. Although there are several solution approaches, solving this problem is challenging du...
A battery degradation-aware energy management system for agricultural microgrids Safavi, Vahid; Vaniar, Arash Mohammadi; Bazmohammadi, Najmeh; Vasquez, Juan C.; Keysan, Ozan; Guerrero, Josep M. (2025-02-01) The integration of renewable energy sources (RESs) into power grids underscores the necessity for efficient energy storage solutions to ensure power balance and increase grid reliability. Although battery energy storage sy...
Direct-Print 3D Electrodes for Large-Scale, High-Density, and Customizable Neural Interfaces Wang, Pingyu; Wu, Eric G.; Uluşan, Hasan; Zhao, Eric Tianjiao; Phillips, A. J.; Kling, Alexandra; Hays, Madeline Rose; Vasireddy, Praful Krishna; Madugula, Sasidhar; Vilkhu, Ramandeep; Hierlemann, Andreas; Hong, Guosong; Chichilnisky, E. J.; Melosh, Nicholas A. (2025-01-20) Silicon-based microelectronics can scalably record and modulate neural activity at high spatiotemporal resolution, but their planar form factor poses challenges in targeting 3D neural structures. A method for fabricating t...
Distributed energy management and communication strategy for network of microgrids Sezgin, Mustafa Erdem; Göl, Murat (2025-01-01) The increasing integration of renewables, battery storage, and electric vehicles is leading communities to operate as microgrids within distribution networks. Managing multiple microgrids as a network of microgrids enhance...
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Examination of EMT-Type Impedance Scanning Techniques for Small Signal Stability Assessment of Inverter Based Resources Meng, Lei; Karaağaç, Ulaş; Pavani, Ahda; Mahseredjian, Jean; Jacobs, Keijo (2025-01-01) Modern power grids that incorporate inverter-based resources (IBRs) may be vulnerable to persistent oscillations and instability incidents, which jeopardize the reliable operation of the system. Unstable operation conditio...
Development of breast tissue–mimicking electrical and acoustic phantoms for magneto-acoustic electrical tomography ZENGİN, REYHAN; Gençer, Nevzat Güneri (2025-01-01) Magneto-acousto electrical tomography (MAET) is a novel medical imaging technique that relies on the difference in electrical properties between healthy and tumor tissues. To facilitate MAET experiments, this study propose...
Energy and Reserve Scheduling of Distribution Network in Presence of Electric Vehicle Aggregators: A Decentralized Approach Tazikeh Lemeski, Atena; Ebrahimi, Reza; Zakariazadeh, Alireza; Firuzi, Keyvan (2025-01-01) Bilateral energy transactions between electric vehicles (EVs) and the power grid are managed by entities called aggregators (AGGs) who work as private or network operator’s agents. The remarkable effects of the AGG’s behav...
Review on DFIG Supplementary SSI Damping Controllers: Design, Development, and Directions Xue, Tao; Karaağaç, Ulaş; Ghafouri, Mohsen; Kocar, Ilhan (2025-01-01) This paper presents a comprehensive review of the supplementary damping controllers (SDCs) proposed for the mitigation of sub-synchronous interaction (SSI) between doubly-fed induction generator-based wind parks (DFIG-WPs)...
Predictive uncertainty in state-estimation drives active sensing Kaan Karagoz, Osman; Kılıç, Ayşegül; Yusuf Aydin, Emin; Ankaralı, Mustafa Mert; UYANIK, İSMAİL (2024-12-04) Animals use active sensing movements to shape the spatiotemporal characteristics of sensory signals to better perceive their environment under varying conditions. However, the underlying mechanisms governing the generation...
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Analyzing Pulse Compression Performance and Image Quality Metrics of Different Excitations in MAET With Magnetic Field Measurements Gözü, Mehmet Soner; Gençer, Nevzat Güneri (2024-12-01) This study investigates the pulse compression technique to improve the performance of magneto-acousto-electrical tomography (MAET) with magnetic field measurements through numerical studies. Emphasizing the effects of spec...
Isotropic gap formation, localization, and waveguiding in mesoscale Yukawa-potential amorphous structures Sarihan, Murat Can; Gövdeli, Alperen; Lan, Zhihao; Yilmaz, Yildirim Batuhan; Erdil, Mertcan; Wang, Yupei; Aras, Mehmet Sirin; Yanik, Cenk; Panoiu, Nicolae Coriolan; Wong, Chee Wei; Kocaman, Serdar (2024-12-01) Amorphous photonic structures are mesoscopic optical structures described by electrical permittivity distributions with underlying spatial randomness. They offer a unique platform for studying a broad set of electromagneti...
A full-custom fully implantable cochlear implant system validated in vivo with an animal model Uluşan, Hasan; Yüksel, Muhammed Berat; TOPÇU, OKAN; Yiğit, H. Andaç; Yılmaz, Ali Özgür; Doğan, Mert; Gülhan Yasar, Nagihan; Kuyumcu, İbrahim; Batu, Aykan; Göksu, Nebil; Uğur, M. Birol; Külah, Haluk (2024-12-01) Realizations of fully implantable cochlear implants (FICIs) for providing adequate solution to esthetic concerns and frequent battery replacement have lacked of addressing system level criteria as a complete device. Here, ...
Transmit beampattern design for FDA-MIMO radar using complex manifold optimization Özen, Berkcan; Tuncer, Temel Engin (2024-11-01) Frequency diverse array multiple-input multiple-output (FDA-MIMO) radar can produce time-stationary range-angle dependent beampattern. The problem with these beampatterns is the repeating lobes in the angle-range domain. D...

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