Istanbul Technical University
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Simulation, DFT calculation, and experimental investigation of graphene nanoplates@MoS2@CoS2 for electrochemically stable Li-S batteries
No full texthttps://doi.org/10.1007/s11581-025-06717-
Evaluation of WRF Simulations of Snow Storm and Polar Low Over Western Black Sea
No full textSnowstorms are the dangerous weather event that effect daily life. In 24th January 2022 Istanbul is affected by a major snow storm, this storm caused financial loses and suspended the both public transportations and flights. For now this phenomena is similar to Polar Lows. Polar Lows are mesoscale phenomena that can produce gust force wind speed, their horizontal scale is 200 to 1000 km, lifetime of Polar Lows last hours to daily scale and they form and intensify in the presence of upper level trough, air-sea or sea-ice temperature difference, potential vorticity anomalies. In this study snowstorm occurred in Western Black Sea will be analyzed using Numerical Weather Prediction model called Weather Research and Forecasting Model and what kind of environment the low developed will be discussed. The upper level cut-off cyclone reached -44 °C in 24 January 2022 which creates a favorable environment for polar low formation and intensifies over the relatively warmer sea. WRF results suggested that wind speed and sea surface temperature minus T500 satisfied the determined criterion for polar lows with 20 m/s and 50 °C respectively. Diabatic processes are another mechanism that enhances the polar lows and, in this study, it is seen they were both equally contributing the polar low and cross sectional analysis showed the warm-core structure and deep moist convection in 24 January 2022 12UTC. However, questions still remaining such as baroclinic instability, condensational heating and other mechanisms that may contribute polar low intensification needs to be investigated comprehensively. From our results the polar low did not intensify because it is not remained over the relatively warm sea long time like the Arctic region and Japan Sea. From our knowledge this is the first study of polar low in Black Sea and it requires more investigation and sensitivity experiments like changing the model parameterization, increasing sea surface temperature etc. to understand polar low structure further more.https://doi.org/10.5194/egusphere-egu24-1216
Introduction to Artificial Intelligence and Machine Learning in Pathology and Medicine: Generative and Nongenerative Artificial Intelligence Basics
No full texthttps://doi.org/10.1016/j.modpat.2024.10068
Error annotation: a review and faceted taxonomy
No full texthttps://doi.org/10.1007/s10579-024-09794-
Organic field-effect transistor-based sensors: recent progress, challenges and future outlook
No full textOFET-based sensors consisting of small molecules or polymers as an active layer have garnered significant attention in recent years owing to their high flexibility and sensitivity, low fabrication cost and excellent substrate conformity.https://doi.org/10.1039/d4tc04265
Green-synthesized silver nanoparticles doped into p(AEMA-co-HEMA) via cryo-polymerization for electrochemical hydrogen peroxide nanocomposite biosensor
No full texthttps://doi.org/10.1007/s10800-024-02248-
İkincil Alüminyum Dökümhanesi Kaynaklı Sera Gazı Emisyonları ve Azaltım Stratejileri
No full textAlüminyum, hafifliği, dayanıklılığı ve geri dönüştürülebilirliği sayesinde inşaat, ulaşım ve ambalaj başta olmak üzere birçok sektörde yoğun olarak kullanılmakta; bu durum, küresel üretim miktarının hızla artmasına neden olmaktadır. Artan talebin çevresel etkilerini azaltmanın en etkili yolu, alüminyumun geri dönüştürülerek ikincil üretim yoluyla değerlendirilmesidir. Günümüzde dolaşımdaki alüminyumun büyük bir bölümü geri dönüştürülmekte olup, bu süreç çoğunlukla küçük ve orta ölçekli işletmeler (KOBİ) bünyesinde yürütülmektedir. KOBİ’lerin bireysel çevresel etkileri sınırlı görünse de sayılarının fazla oluşu ve denetim mekanizmalarının yetersizliği nedeniyle küresel sera gazı emisyonlarına kayda değer düzeyde katkı sağladıkları bilinmektedir. Bu çalışmada, Türkiye’de faaliyet gösteren KOBİ ölçeğindeki bir ikincil alüminyum dökümhanesinin 2022 yılına ait sera gazı emisyonları gerçek işletme verileri kullanılarak hesaplanmış; üretime özgü spesifik emisyon değeri belirlenmiş ve üretim adımları temelinde çevresel etkiler değerlendirilmiştir. Hesaplamalar sonucunda toplam emisyon miktarı 9.645,3 ton CO₂e yıl-1 olarak belirlenmiş; bu emisyonların %60’ının doğal gaz, %38’inin elektrik tüketimi ve %1,1’inin ulaşım kaynaklı olduğu tespit edilmiştir. Tesise özgü sera gazı emisyon katsayısı 0,402 ton CO₂e ton-1 alüminyum olarak hesaplanmış, eritme aşamasının toplam emisyonların %33’ünü oluşturduğu saptanmıştır. Ayrıca çalışmada, emisyon azaltımına yönelik teknik ve operasyonel iyileştirme önerileri sunulmuş; tesisin üretim faaliyetleri Avrupa Birliği’nin Sınırda Karbon Düzenleme Mekanizması bağlamında değerlendirilmiştir.https://dx.doi.org/10.5281/zenodo.15730752https://dx.doi.org/10.5281/zenodo.1573075
Safety distance control approach in moving block signaling systems
No full textAs technology progresses in recent years, the advances in transportation continue rapidly. Some of these advances are seen in the railway industry. Especially the innovations in the railway interlocking system make this industry more preferable. One of these innovations is moving block signaling. In an urban rail transport system, moving block signaling has gradually started to replace the fixed block signaling with the development of driverless and communication-based control systems. In this study, an approach has been proposed for moving block signaling. The movement situations between the stations have been shown, by determining a reference speed profile and the relationship between the locations for the following railway vehicles have been evaluated by simulations obtained by MATLAB/SimulinkTM.https://doi.org/10.28948/ngumuh.164464
Dijital sanatın kamusal mekanda dönüştürücü rolü: Haydarpaşa siloları üzerine deneysel bir inceleme
No full textThesis (M.Sc.) -- Istanbul Technical University, Graduate School, 2025This thesis investigates the transformative potential of digital art in public spaces through a combined theoretical and empirical approach. In its first part, it establishes a conceptual framework by distinguishing "space" (a measurable, abstract void) from "place" (space endowed with human meaning), and by examining how public space has historically functioned as a site of social interaction, political representation and collective memory. Drawing on Lefebvre, Habermas and Arendt, the study emphasises that public space is not merely defined by its physical accessibility but by the practices—deliberation, protest, celebration—that give it its democratic and cultural significance. The emergence of digital technologies has added new layers of interactivity and temporality to this field, enabling artworks to intervene in the public sphere in ways that simultaneously alter perception, social dynamics and the built environment. The literature review surveys landmark global examples of digital public art, including Rafael Lozano-Hemmer - Border Tuner and Voice Tunnel, Refik Anadol - WDCH Dreams, Krzysztof Wodiczko - Hiroshima Projection, NOHlab - Yekpare, and Ryoji Ikeda - Spectra series. These case studies demonstrate how large-scale projections, interactive sensors, augmented reality and immersive light-and-sound installations can create temporary spatial reconfigurations, elicit collective participation and embed new narratives in urban memory. Building on these insights, the thesis presents an in-depth case study of the abandoned Haydarpaşa Silos in Istanbul. Using Rhinoceros and Blender, two distinct digital animations—an immersive piece titled "Vanishing Absence" and a reflective work named "Unveiling Veil"—were modelled and rendered, then evaluated through a survey of eighty urban residents. Participants rated each scenario on affective adjectives and site-usage intentions, and their open-ended comments were thematically analysed. The results show that "Vanishing Absence" produced stronger perceptual and behavioural shifts—higher engagement, a greater sense of vitality and increased likelihood of return visits—while "Unveiling Veil" also fostered positive sentiment but to a lesser extent. By sequentially adopting the roles of researcher, artist, and designer, the author demonstrates that digital art can meaningfully reshape both the symbolic and functional dimensions of public space, even in the absence of permanent physical transformations. Its most enduring effect lies in revising collective mental images and stimulating renewed attention to overlooked sites. Recommendations for future practice include incorporating multisensory data (e.g., sound maps, biometrics), engaging local communities and authorities in co-design, and planning long-term installations to assess sustained impacts on urban life and memory.M.Sc
Investigation of Magnetic Gear System Based on the Use of Superconductor and Permanent Magnet
No full textMagnetic gears claim to represent the latest technology in power transmission, offering many advantages over mechanical gear systems. Combined with superconductivity, these innovative structures have the potential to provide efficiency, low energy loss and good performance for industrial applications. This article examines the principles and applications of magnetic gears associated with the superconductivity. Magnetic gear works on the principle of utilizing magnetic fields between rotating elements to transmit mechanical force. Unlike traditional gear systems that rely on physical contact between gears, magnetic gears transmit torque through the interaction of magnetic forces. With the presence of superconductivity, stronger magnetic fields and lower energy losses can be achieved in magnetic gears. In this context, a superconducting magnetic gear system was examined for various configurations based on the finite element method using Comsol Multiphysics software. First of all, a standard magnetic gear was presented to establish benchmarking for the use of bulk superconductor in light of the experimental and theoretical analysis. Accordingly, the superconductor was incorporated into the stator layer to observe the Meissner effect in the gear mechanism. In addition, the superconducting model in the rotor layer of the magnetic gear was also introduced based on the magnetized bulk superconductor approach. Both results associated with the use of superconductor in the rotors and stator indicate that quantitative improvement can be achieved for the torque transfer performance in comparison with standard magnetic gear.https://doi.org/10.1109/access.2025.3541736https://doi.org/10.1109/ACCESS.2025.3541736https://doaj.org/article/abc15657ac344e449c77b8fab74b2b6