Recep Tayyip Erdoğan Üniversitesi Kurumsal Akademik Arşivi
DSpace@RTEÜ, Recep Tayyip Erdoğan Üniversitesi tarafından doğrudan ve dolaylı olarak yayınlanan; kitap, makale, tez, bildiri, rapor, araştırma verisi gibi tüm akademik kaynakları uluslararası standartlarda dijital ortamda depolar, Üniversitenin akademik performansını izlemeye aracılık eder, kaynakları uzun süreli saklar ve yayınların etkisini artırmak için telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Synergistic effects of ionic liquid and redox species for improved aqueous-based Zn-ion capacitor
(Elsevier, 2026) Ülker, Emine Kapancık; Mohammadzadeh, Kazem; Lahiri, Abhishek
As the demand for high-performance energy storage devices grow, aqueous zinc-ion hybrid capacitors (ZICs) have gained significant attention for their ability to combine the high energy density of zinc-ion batteries (ZIBs) with the high-power density of supercapacitors (SCs). However, their application is limited by poor stability caused by zinc dendrite growth from uneven Zn deposition/stripping. Ionic liquids (ILs) and redox species in ZICs are an emerging area of research focused on improving the performance and efficiency of energy storage devices. The combination of IL and redox species can enhance the charge storage capacity, stability, and cycling performance of ZICs, potentially providing high energy and power densities with long-term durability. Herein, synergistic effects of 1-Ethyl-3-methylimidazoliumtriflate (EMImTfO) and 1-Ethyl-3-methylimidazolium iodide (EMImI) were investigated on aqueous electrolyte of Zn(TfO)2. The Zn/graphene ZIC delivers capacities of 82 and 96 mAh g−1 at 0.5 A g−1 in Zn(TfO)2 and Zn(TfO)2/ EMImTfO electrolytes, respectively, while the redox additive of EMImI boosts the capacity to 182 mAh g−1 under the same conditions. Moreover, even at a high current density of 5 A g−1, the capacity was found to be 100 mAh g−1, indicating improved rate capability. These findings offer a promising strategy for the development of redox-active electrolytes tailored for next-generation sustainable energy storage systems.
Exploring the effect of ultrasonic vibrations on the thermohydraulic performance in a minichannel heat sink: Numerical analysis of experimental results
(Elsevier, 2026) Alenezi, Abdulmajeed; Gürsoy, Emrehan; Ergün, Alper; Phelan, Patrick; Gedik, Engin
Ultrasonic ( US ) applications in thermal systems contribute to the disruption of the boundary layer and the increase of mixing in fluids, thus improving overall system performance. Utilizing this phenomenon, this study aimed to investigate the effect of US power and various heat inputs (Q̇) on the thermohydraulic performance and entropy generation in a rectangular minichannel heatsink. The effect of US on MCHSs has not been comprehensively investigated in the literature, both experimentally and numerically. This study aims to fill this gap and provide a scientific contribution to thermohydraulic performance and entropy generation. For this purpose, a test rig was designed and built. The heatsink was made of copper, and a 27.8 kHz US transducer with P us = 9.9 W input power was applied to the top wall of the heatsink. ANSYS Fluent 2024 R1 was used to solve the governing equations in numerical analysis. The analyses were performed under laminar flow conditions with a range of Reynolds numbers ( Re ). The results obtained from the experiments and numerical simulations demonstrated reasonable agreement, both with each other and with literature correlations. The results showed that the average Nusselt number ( Nu ) increased by 14% when Q̇ was increased from 50 W to 60 W, and by 13% when US was applied. The US application provides a more homogeneous temperature distribution in the channel and header, especially at low Re . It was determined that Q̇ did not affect the friction occurring in the system, but the friction effect of US was more dominant, especially at low Re . Increasing the Q̇ to the system worsened the performance by increasing thermal entropy generation (Ṡgen, thermal) up to 30%. In contrast, the use of US improved the performance by reducing Ṡgen, thermal by up to 4.5%. The situation was reversed for frictional entropy generation (Ṡgen, frictional), where increasing Q̇ yielded a decrease of up to 5%. However, when the US was applied, there was a 38% increase in Ṡgen, frictional at Re = 84 for each Q̇ and Ṡgen, thermal is more dominant than Ṡgen, frictional. In other words, compared with conventional MCHSs without US , the proposed US -assisted system increased the average Nu by 13% and reduced the Ṡgen, thermal by up to 4.5%, resulting in a significant improvement in performance.
Identification of potential entomopathogenic bacteria in the culturable bacterial flora of the Brown Marmorated Stink Bug (Halyomorpha halys, Stål, 1885) (Hemiptera: Pentatomidae)
(Springer, 2026) Gençer, Dönüş; Bayramoğlu, Zeynep; Aygün, Kevser; Demir, İsmail
The Brown Marmorated Stink Bug (Halyomorpha halys) has become a major invasive agricultural pest in Türkiye, particularly threatening hazelnut production in the Black Sea Region. This study aimed to isolate and identify culturable bacterial flora from H. halys populations in Türkiye and assess their potential as biological control agents. A total of nine bacterial isolates were obtained from diseased individuals and identified using morphological, biochemical, and 16 S rRNA gene sequencing analyses. A total of nine bacterial isolates were obtained and identified as belonging to six genera: Bacillus, Staphylococcus, Mammaliicoccus, Enterobacter, Acinetobacter, and Lysinibacillus. Insecticidal bioassays revealed that all isolates exhibited varying levels of pathogenicity against H. halys, with Bacillus thuringiensis (Hh18) causing 100% mortality in nymphs and 66% in adults at 1 × 10⁷ CFU/mL after 10 days. Staphylococcus aureus and Acinetobacter sp. caused 86% mortality in nymphs, while Mammaliicoccus sciuri achieved 53% mortality in adults. These quantitative results provide strong evidence for the entomopathogenic potential of native bacterial isolates against H. halys.
The advancement of artificial intelligence in point-of-care ultrasound (POCUS): A bibliometric analysis
(Wiley, 2025) Çelik, Ali; Yazıcı, Mümin Murat
Introduction: Artificial intelligence (AI) has advanced image interpretation capabilities, and AI has gained increasing prominence in medical imaging. Point-of-care ultrasound (POCUS) is a key imaging tool where AI can be applied. A bibliometric study on AI in POCUS has not yet been published in the literature. Therefore, using bibliometric and statistical methods, we aimed to analyze publications on AI in POCUS. Methods: This research is a bibliographic and descriptive analytical study. The Web of Science database was utilized to identify existing publications and conduct the analyses. A non-linear regression analysis (using an exponential model) was employed to predict the number of publications over the following years. Additionally, the study employed bibliometric network visualization, world map visualization, and publication relationship visualization. Results: Examining the distribution of publications related to AI in POCUS, 77.2% (207) are articles, 17.5% (47) are review articles, and the remaining are other types of publications. The strong relationship between lung ultrasound and AI reflects the impact of the COVID-19 pandemic on research. However, the high frequency of terms related to multiple systems, including pulmonary, cardiovascular, trauma-related, and neurologic conditions, suggests wide-ranging clinical applicability. These findings may help guide the planning and prioritization of future AI-based research in POCUS. Conclusion: This bibliometric study on artificial intelligence in POCUS examined 268 publications. The analyses in this study can be a valuable resource for researchers working on AI in POCUS or who will work on AI in POCUS in the future.
A quantum cryptographic scheme for an audio file using quantum data encoding and quantum permutation pad
(Institute of Electrical and Electronics Engineers Inc., 2025) Şanal, Burcu; Güler, Erkan; Kakiz, M. Talha; Çavdar, Tuǧrul
Quantum computers can handle integer factorization and discrete logarithms more efficiently than their classical counterparts, which poses a threat to classical publickey cryptography. Also, quantum encryption systems and postquantum cryptography are gaining increasing attention due to the data vulnerability of classical systems. Hence, quantumnative encryption schemes are urgently needed. This work utilizes Quantum Permutation Pad (QPP), and it can be considered as an enhanced quantum extension of One Time Pad. A 2-qubit QPP is used to encrypt and decrypt an audio file using lowdepth gate permutations. The data file is segmented into 4bit blocks, each block is encoded as quantum states by using both basis and amplitude encoding, then encrypted with 2-qubit permutation circuits (depth ≤ 5). The key needed for the permutation index is distributed by using the Greenberger-Horne-Zeilinger (GHZ)-based Quantum Secret Sharing scheme prior to the encoding stage. IBM Qiskit simulations showed that QPP can be a lightweight encryption scheme for NISQ devices.
