İstanbul Sağlık ve Teknoloji Üniversitesi Kurumsal Akademik Arşivi
DSpace@İSTÜN, Üniversite mensupları 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 telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
Phocatalytic dye degradation activities of chitosan film modified by green synthesized tio2 from aloe vera leaf extract
(Avestia Publishing, 2025) Kaba, İbrahim; Bozkurt, Rabia Nur; Kerkez Kuyumcu, Özge; Koca, Atıf
Recent research focuses on heterogeneous photocatalysis, an environmentally friendly and cost-effective method that uses solar energy to completely degrade pollutants without generating secondary waste. The focus is optimizing the properties of photocatalysts in terms of electronic structure, light absorption, and reduced recombination rate of photogenerated charges and easy separation of the photocatalyst from reaction media [1]. The potential for efficient, sustainable heterogeneous photocatalysis has been demonstrated by semiconductors such as TiO₂, ZnO, Fe₂O₃, CdS, CuS, and ZnS [2]. TiO₂ is regarded as one of the most effective photocatalysts. The usage of TiO₂ for the degradation of hazardous organic dyes in wastewater has significant potential. The separation of the photocatalyst from the reaction medium remains a significant challenge in photocatalytic applications. In particular, the recovery of TiO₂ after the degradation of organic dyes poses a considerable difficulty, as its fine particulate nature hampers efficient separation from the treated solution. One of the strategies in this regard is the immobilization of the photocatalyst by embedding it into a polymer matrix. This approach facilitates easier separation of the photocatalyst from the reaction medium [3]. Chitosan, a natural biopolymer widely used for its biodegradability and biocompatibility, is an attractive candidate for hydrogel development due to its functional groups that serve as cross-linking sites during hydrogel formation. It has also been combined with photocatalysts and utilized in numerous studies [4-6]. In this study, green-synthesized TiO₂-embedded chitosan films (Bio-TiO₂-CS films) prepared using aloe vera leaf extract offer the advantage of facile separation after the degradation process, as well as potential reusability following dye removal. As the goal of the study, it is believed that the obtained chitosan film hydrogels can be used as an effective bio-template material to disperse TiO2 nanostructures due to their three-dimensional porous structure and appropriate nanopore size distribution, and this feature has led us to investigate the simpler, recyclable, green approach, and biomaterial development of the use of Bio-TiO₂-CS Hydrogel Films in photocatalytic dye removal from water.
Development of an aluminum body ship shaft sealing element
(RDCONF, 2025) Ertuğrul, Hasan; Kaynar, Arda; Tanrıver, Kürşat; Ay, Mustafa
Günümüzde şaft geçişlerinde kullanılan sızdırmazlık elemanları, gemi ve endüstriyel makinelerde güvenlik ve verimlilik açısından kritik öneme sahiptir. Mevcut uygulamalar, genellikle elastomer contalar, metal muhafazalar veya yağlama destekli sistemler üzerine kuruludur. Ancak bu yapılar, montaj sırasında hizalama hatalarına karşı hassas olup birleşim noktalarında sızıntı riski barındırmakta, uzun süreli kullanımda korozyon ve aşınma sorunları ile karşılaşmaktadır. Ayrıca kauçuk veya yaylı mekanizmalara dayalı çözümler, yüksek basınç, titreşim ve sıcaklık altında deformasyona uğrayarak sızdırmazlık performansını kaybederken, yağlama gerektiren sistemler bakım maliyetlerini artırmakta ve çevresel riskler oluşturmaktadır. Bu yetersizlikler, daha dayanıklı, montajı kolay, bakım gereksinimi düşük ve korozyona dirençli yenilikçi tasarımlara olan ihtiyacı ortaya koymaktadır. Bu çalışmada, özellikle endüstriyel makine ve denizcilik uygulamalarında güvenli montaj sağlamak amacıyla kullanabilecek puzzle tipi bir sızdırmazlık elemanı tasarım, geliştirilmesi ve üretilmesi amaçlanmıştır. Bu tasarımın en önemli avantajı, denizcilik uygulamalarında sıklıkla karşılaşılan sızdırma, montaj zorlukları ve korozyon problemlerine etkili çözümler sunmasıdır. Üç parçalı puzzle tipi geçmeli tasarım, tamamlayıcı (dişi-erkek) bağlantı noktaları sayesinde parçaların montaj sırasında otomatik olarak hizalanmasını sağlayarak, işçilik kaynaklı hataları minimize eder ve montaj süresini kısaltmaktadır. Geçmeli bağlantı yapısı sayesinde birleşim noktalarındaki temas yüzeyi artırılarak sızdırmazlık performansı maksimum seviyeye çıkarılmaktadır. Dış yüzeyde bulunan kanal, O-ring, conta veya sıkıştırma teli gibi ek elemanların yerleştirilmesine olanak tanıyarak yüksek basınç ve titreşim altında dahi güvenli bir bağlantı sağlamaktadır. Kullanılan karbon grafit ve korozyona dayanıklı alüminyum alaşımı, deniz ortamındaki aşındırıcı etkiler karşısında uzun ömür ve bakım kolaylığı sunmaktadır. Ayrıca yapının hafif olması, montaj ve taşıma süreçlerini kolaylaştırırken, sistemin genel maliyetini de düşürmektedir. Tüm bu özellikler, güvenlik, dayanıklılık ve operasyonel verimlilik açısından mevcut sistemlere kıyasla önemli üstünlükler sağlamaktadır.
A case study for re-domestication in Turkish translation system: Texier’s Asie Mineur
(Hacettepe Üniversitesi, 2025) Şirin, Said Emre
Anatolia, as the cradle of civilizations, with its rich cultural, historical, and natural heritage, has attracted not only the peoples living on its lands but also travelers, researchers, and scholars from different geographies. This study examines the translations of French archaeologist Charles Texier’s Asie Mineure, written after his travels and observations in 19th-century Anatolia, into Turkish. The Turkish translations of the work are analyzed within the framework of the concepts of re-domestication, cultural textless back translation, and paratextuality. Originally published in French in 1839, the work was translated into Ottoman Turkish in 1923, and later, in 2002, this version was revised, simplified, and adapted into Modern Turkish Language. During this process, various paratexts were added, and editorial modifications were introduced. A striking aspect of the study is that the significant temporal gap between the two translations is reflected in both the linguistic structure of the work and the translation policies applied. Comparative analysis suggests that the agents of the modern Turkish translation system, finding the domestication of the first translation insufficient, may have adopted a re-domestication policy in the second translation. Ultimately, the study argues that it makes an important contribution to understanding the rich translation and cultural activities spanning from the late Ottoman period to the early Republican era, and that it constitutes a valuable case for translation studies. Thus, the work is regarded not only as a written and linguistic translation product, but also as a source reflecting the diversity of translation policies within their historical context.
The african middle east association of gastroenterology (AMAGE) clinical practice guidelines for the diagnosis and management of metabolic dysfunction associated fatty liver disease
(Elsevier, 2026) Fouad, Yasser; Elwakil, Reda; Sanai, Faisal M.; Ojo, Olusegun; Al Awadhi, Sameer; Ocama, Ponsiano; Abdelaty, Nadia; Al-Busafi, Said A.; Örmeci, Necati; Eslam, Mohammed
Over the past few decades, the profile of liver diseases in Africa and the Middle East has undergone significant changes. The incidence of metabolic dysfunction-associated fatty liver disease (MAFLD) has risen to alarming levels. Despite the seriousness of the situation, there is a scarcity of local or regional guidelines established to address it. This document presents the clinical practice guidelines from the African Middle East Association of Gastroenterology (AMAGE) related to the screening, diagnosis, and management of MAFLD. It addresses multiple aspects of managing this condition while taking into account local circumstances and the healthcare system's management requirements. These guidelines are intended for routine clinical use, with a specific focus on particular groups when needed.
Comparative evaluation of deep learning models for the classification of impacted maxillary canines on panoramic radiographs
(MDPI Publishing, 2026) Tokatlı, Nazlı; Erdem, Buket; Özcan, Mustafa; Turan Maviş, Begüm; Şar, Çağla; Özdemir, Fulya
Background/Objectives: The early and accurate identification of impacted teeth in the maxilla is critical for effective dental treatment planning. Traditional diagnostic methods relying on manual interpretation of radiographic images are often time-consuming and subject to variability. Methods: This study presents a deep learning-based approach for automated classification of impacted maxillary canines using panoramic radiographs. A comparative evaluation of four pre-trained convolutional neural network (CNN) architec tures—ResNet50, Xception, InceptionV3, and VGG16—was conducted through transfer learning techniques. In this retrospective single-center study, the dataset comprised 694 an notated panoramic radiographs sourced from the archives of a university dental hospital, with a mildly imbalanced representation of impacted and non-impacted cases. Models were assessed using accuracy, precision, recall, specificity, and F1-score. Results: Among the tested architectures, VGG16 demonstrated superior performance, achieving an accuracy of 99.28% and an F1-score of 99.43%. Additionally, a prototype diagnostic interface was developed to demonstrate the potential for clinical application. Conclusions: The findings underscore the potential of deep learning models, particularly VGG16, in enhancing diag nostic workflows; however, further validation on diverse, multi-center datasets is required to confirm clinical generalizability.
