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
Characterization of thermal, chemical, mechanical, and fatigue behavior of 3D printed ABS-based elastomeric blends: ABS/EVA and ABS/TPU
(Elsevier, 2025) Kuleyin, Hamdi; Budak, Selahattin; Yasan, Ömer Barışkan; Gümrük, Recep
The polymer blending method is widely used to obtain balanced mechanical properties and structural performance in many engineering applications. This study investigates the influence of Ethylene-Vinyl Acetate (EVA), and Thermoplastic Polyurethane (TPU) composition ratios on the thermal, chemical, viscoelastic, mechanical, and fatigue life behavior of Acrylonitrile-Butadiene-Styrene (ABS) based elastomeric blends. For this purpose, structural and mechanical properties of the blend material depending on their composition ratio were carried out through a series of characterization analyses, and tensile and fatigue tests. The findings indicated that ABS/EVA and ABS/TPU blends formed an immiscible structure. In addition, it was determined that the storage modulus of the blend with 10 % TPU improved because of the presence of new absorption peaks in the structure. The mechanical properties such as elastic modulus, yield strength, and ultimate tensile strength decreased concerning neat ABS with an increase in the EVA and TPU composition ratio for blend materials. However, the elongation to break was achieved approximately 6 times increasing with an increase in the TPU ratio for ABS/TPU blends. It was determined that the fatigue strength value in ABS/EVA and ABS/TPU blends decreased with the decrease in ABS composition ratio in the blend system. However, it was found that fatigue life improved by 25 % compared to ABS at low-stress amplitude for 10 % TPU additive. Finally, it can be revealed that the ABS-based elastomeric blends can be used to obtain desired properties according to their composition ratios for different applications.
A review of carbon-based hybrid materials for supercapacitors
(Science Press, 2025) Manfo, Theodore Azemtsop; Laaksonen, Hannu
Supercapacitors are gaining popularity due to their high cycling stability, power density, and fast charge and discharge rates. Researchers are exploring electrode materials, electrolytes, and separators for cost-effective energy storage systems. Advances in materials science have led to the development of hybrid nanomaterials, such as combining filamentous carbon forms with inorganic nanoparticles, to create new charge and energy transfer processes. Notable materials for electrochemical energy-storage applications include MXenes, 2D transition metal carbides, and nitrides, carbon black, carbon aerogels, activated carbon, carbon nanotubes, conducting polymers, carbon fibers, and nanofibers, and graphene, because of their thermal, electrical, and mechanical properties. Carbon materials mixed with conducting polymers, ceramics, metal oxides, transition metal oxides, metal hydroxides, transition metal sulfides, transition metal dichalcogenide, metal sulfides, carbides, nitrides, and biomass materials have received widespread attention due to their remarkable performance, eco-friendliness, cost-effectiveness, and renewability. This article explores the development of carbon-based hybrid materials for future supercapacitors, including electric double-layer capacitors, pseudocapacitors, and hybrid supercapacitors. It investigates the difficulties that influence structural design, manufacturing (electrospinning, hydrothermal/solvothermal, template-assisted synthesis, electrodeposition, electrospray, 3D printing) techniques and the latest carbon-based hybrid materials research offer practical solutions for producing high-performance, next-generation supercapacitors.
Deciphering the morpho-physiological and biochemical response of sunflower hybrids with the application of biochar and slow-release nitrogen fertilizers under drought stress for sustainable crop production
(Frontiers Media SA, 2025) Hussain, Shabir; Khan, Mehrab; Altaf, Muhammad Tanveer; Shah, Muhammad Nadeem; Alfagham, Alanoud T.
Agriculture problems like drought stress and improper fertilization like overuse of nitrogen fertilizers for maximum productivity are the problem responsible for low yield of crop and environmental pollution. Biochar and slow releasing nitrogen fertilizers (SRNF) application in agriculture are the sustainable practices being used for better crop nutrient management strategies, since the well-recognized environmental problem caused by overusing fertilizers. Biochar also used as tools for sustainable way alleviating drought stress. For this, two-year field study was planned with randomized complete block designed (RCBD) and was replicated three time. Treatments included the two irrigation conditions like normal irrigation (CK) and drought stress (DS), two biochar treatments like biochar (BC) and without biochar (WBC); and three application of SRNF like zinc-coated urea (ZCU), sulfur-coated urea (SCU) and non-coated simple urea (SU). Results revealed that drought stress significantly reduced plant height (20.7%), stem diameter (25.6%), and achene yield (25.9%), while increasing antioxidant activity. Biochar mitigated these effects, increasing plant height by 23.2% and achene yield by 12.0% under drought stress. Among SRNFs, ZCU was most effective, improving photosynthetic rate (18.5%), chlorophyll content (12.3%), and achene yield (19.6%) under drought conditions. The combination of biochar and ZCU improved soil health, water retention, and nutrient efficiency, leading to enhanced plant growth and yield. Statistical analysis confirmed significant differences among treatments.
The relationship between e-health literacy, health anxiety, cyberchondria, and death anxiety in university students that study in health related department
(Dove Medical Press Ltd., 2025) Çol, Bahar Kefeli; Başaran, Ayşe Gümüşler; Köse, Burcu Genç
Introduction: While the Internet can be a valuable resource for learning about health issues, for those without adequate e-health literacy skills, it can have adverse effects on unwanted anxiety and cyberchondria risk. Improving e-health literacy is essential to manage health and death anxiety and help reduce the risk of cyberchondria. The aim of this study is to determine the e-health literacy, health anxiety, cyberchondria and death anxiety levels of university students, evaluate them in terms of independent variables and examine the relationship between the scales. Methods: The study was completed with 568 students receiving education in the health department of a university. Data were obtained using the e-Health Literacy Scale, Health Anxiety Inventory, Cyberchondria Severity Scale, and Death Anxiety Scale. The chi-square, Mann–Whitney U, Kruskal–Wallis, Tamhane’s T2 post hoc tests, and Spearman correlation were used to analyze the data. Results: The mean score of e-health literacy was 28.63±4.65; health anxiety was 19.11±8.37, cyberchondria was 86.30±18.28 and death anxiety was 7.34±2.14. Cyberchondria is low in women and those who do not conduct online research on health. E-health literacy was higher in those earning above the minimum wage. Health and death anxiety was low in men and in those who did not conduct online health-related research. Health anxiety was positively correlated with cyberchondria and death anxiety and negatively correlated with e-health literacy. There was a positive relationship between cyberchondria and E-health literacy and death anxiety. This study highlights the complex relationship between eHealth literacy, health anxiety, cyberchondria and death anxiety. It shows that low e-health literacy can increase health anxiety, which in turn can worsen cyberchondria and death anxiety. By emphasising the importance of e-health literacy in health education, the findings may help students manage their anxiety, make informed health decisions, and increase their professional competence.
Rapid drug desensitization in seven patients with delayed hypersensitivity reactions to biologics and targeted therapies: Reason, successes, and failures
(2025) Önalan, Tuğba; Çölkesen, Fatih; Gerek, Mehmet Emin; Akkuş, Fatma Arzu; Evcen, Recep; Arslan, Şevket
Backround: Rapid drug desensitization (RDD) is commonly used for immediate drug hypersensitivity reactions (DHR) across various drugs. In delayed DHRs, the conventional approach is slow desensitization; however, limitations may arise due to drug-specific or disease-related factors. With the increasing role of targeted molecular drugs in delayed DHRs, data on the efficacy of RDD in these contexts remain scarce. Objective: This case series aims to explore the rationale and outcomes of RDD in managing delayed DHRs associated with targeted therapies. Methods: We analyzed data from patients referred to a tertiary university hospital's drug allergy outpatient clinic between January 2021 and April 2024. The subjects experienced delayed DHRs during treatment with targeted drugs and, subsequently, underwent RDD. Results: The drugs administered via RDD included bevacizumab, rituximab, daratumumab, lenalidomide, bortezomib, and carfilzomib. The index reactions included maculopapular eruptions (MPE), drug reaction with eosinophilia and systemic symptoms (DRESS), and acute generalized exanthematous pustulosis (AGEP). Delayed breakthrough reactions were observed in four of seven patients. RDD with bortezomib was unsuccessful in all three patients, and delayed reactions were observed in all patients with severe cutaneous adverse reactions (AGEP and DRESS). Conclusion: Suggesting significant success of RDD for delayed DHRs induced by targeted therapies may be overly optimistic. Nevertheless, four of seven patients, including one with AGEP, were able to continue their treatment. Managing patients with advanced diseases and delayed DHR poses notable challenges. The risk to patient survival from withholding life-saving medication must be weighed against the risks of desensitization. The low sensitivity of skin tests and the critical waiting period complicate decision-making. Given the unique contribution of targeted agents in the treatment of severe, life-threatening diseases, further research on desensitization is warranted.
