İstanbul Galata Üniversitesi Kurumsal Akademik Arşivi
DSpace@Galata, İstanbul Galata 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 telif haklarına uygun olarak Açık Erişime sunar.
Güncel Gönderiler
A Comparison of the Color Stability and Surface Roughness of 2 Different Laminate Porcelains in Various Solutions
(2026) Baykal, Denizhan; Akman, Burcu; Çopuroğlu, Akanay; Topalan, Onur; Davut, Umur; Özyılmaz, Özgün Yusuf
Background: Esthetics is a primary concern in modern dentistry, and laminate veneers are commonly used for addressing discoloration and shape anomalies. Understanding the effects of various beverages on the color and surface roughness of dental ceramics is crucial for long-term clinical success. Methods: Fifty specimens were prepared from feldspathic (VITA Cerec) and leucite-reinforced ceramic blocks (IPS Empress Esthetic CAD). After standardized polishing and glazing, the specimens were immersed in 5 solutions (coffee, tea, cola, wine, and distilled water) and stored for 3 months. Color changes (ΔE) were measured with a spectrophotometer, and surface roughness (Ra) was evaluated using a profilometer at baseline, 1 week, 1 month, and 3 months. Results: IPS Empress Esthetic CAD specimens demonstrated greater color change than VITA specimens, with wine causing the most significant ΔE values in both groups. All color changes remained clinically acceptable (ΔE < 3.3). Surface roughness increased slightly over time but did not show statistically significant differences in any group. Conclusion: Both laminate porcelain materials demonstrated acceptable color stability and surface integrity after prolonged exposure to common beverages. Wine produced the highest color changes, while roughness changes were minimal and not significant.
A NARRATIVE REVIEW ON ORTHOTIC APPROACHES IN THE TREATMENT OF BRACHIAL PLEXUS BIRTH PALSY
(Turkish Physiotherapy Association, 2026) İnal, Habibe Serap; Koc, Ebru A. K. B. U. G. A.; Türkmen, Ceyhun; Yıldırım, Gülenay
Purpose: This narrative review synthesized recent evidence on orthotic interventions for brachial plexus birth palsy (BPBP), focusing on indications, timing, and wear schedules. Methods: We searched for English-language articles (published 2004-2025) in PubMed, Scopus, Web of Science, ProQuest, and Google Scholar using "brachial plexus birth palsy" combined with orthosis-related terms. Thirteen studies met inclusion criteria. Results: Early shoulder abduction-external rotation and elbow flexion positioning orthoses improved joint alignment and reduced contracture risk in infants. In older children, static-progressive or dynamic braces corrected established elbow contractures. Caregiver education and adherence influenced outcomes. Wear schedules ranged from a few hours daily for dynamic daytime bracing to near-continuous early positioning. Overall study quality was low and outcome measures varied. Conclusion: Current evidence is limited, but early shoulder abduction-external rotation and elbow positioning orthoses appear beneficial in BPBP. Later static or dynamic braces complement surgery or rehabilitation for residual contractures. High-quality research is needed to establish standardized protocols and determine optimal orthosis type, timing, and duration for each severity level.
The relationship between mental toughness, stress, and mindfulness in climbers
(Frontiers Media, 2026) Alp, Hulusi; Bozgüney, Reha; Türkay, İbrahim Kubilay; Turaç, Görkem; Öcal, Zeynep Senem Söyleyici; Yazar, Didem; Temur, Eyüp; Can, Banu
Background: Climbing is a sport that demands high levels of both physical and mental effort, and athletes may encounter significant stress during performance. Mental toughness refers to an athlete’s capacity to cope with stress and maintain performance under challenging conditions. Mindfulness is the conscious awareness and experiential engagement with the present moment. This study aimed to examine the relationship between mental toughness and stress levels in climbers, and to investigate the moderating role of mindfulness in this relationship. Methods: The study included 150 active climbers (90 males, 60 females; mean age = 25.4 ± 4.7 years). Mental toughness was assessed using the Sports Mental Toughness Questionnaire (SMTQ) and the Mental Toughness Inventory (MTI), stress levels were measured via the Perceived Stress Scale (PSS-10), and mindfulness was evaluated using the Mindful Attention Awareness Scale (MAAS). Multiple regression and moderation analyses were conducted using SPSS and the PROCESS macro, with 5,000 bootstrap samples and 95% confidence intervals. Results: Correlation analyses indicated significant negative relationships between SMTQ and MTI scores and PSS-10 scores, as well as between MAAS scores and PSS-10 scores (p < 0.001). Multiple regression analyses revealed that SMTQ (β = −0.33), MTI (β = −0.38), and MAAS (β = −0.29) significantly and negatively predicted stress levels (p < 0.001). Moderation analysis showed that higher levels of mindfulness strengthened the negative effect of mental toughness on stress (Interaction β = −0.18, p = 0.002). Conclusion: These findings indicate that both mental toughness and mindfulness play a crucial role in stress management among climbers. In particular, mindfulness enhances the stress-reducing effects of mental toughness. The results provide practical implications for sport psychology interventions and climbing training programs.
E-Commerce Logistics in the Grip of Digital Transformation: A Review of the Literature from the Perspective of Technology Management
(2026) Gerekli, İsa; Ayaz, Esra
Changes and developments in the global order have brought about a significant differentiation in companies' sales strategies and consumers' purchasing behavior. This differentiation has also increased the strategic importance of e-commerce logistics and technology management. The limited number of bibliometric studies that address e-commerce logistics and technology management together forms the starting point of this study. Although numerous studies have examined e-commerce, logistics, and technology separately, bibliometric studies that address e-commerce logistics and technology management together remain limited in the literature. This study aims to fill this gap by providing a comprehensive bibliometric analysis of academic publications produced in this field. To this end, a detailed search was conducted in the Web of Science database on December 31, 2025. The keywords selected for searching the database were “e-commerce logistics”, “technology management”, “technology”, and “logistics”. The selected keywords were searched in the database with a limitation applied to all fields. As a result of the search, data from 824 studies published between 2015 and 2025 were obtained. After detailed examination, the obtained data were transferred to the Vosviewer bibliographic analysis program and various analyses were performed. In this study, network mapping, co-authorship analysis, country citation analysis, country citation matching, keyword analysis, and bibliographic matching analysis of texts were performed on the concepts of e-commerce logistics and technology management. The findings reveal that publication output in the field showed a significant upward trend, particularly after 2021, reaching its peak in 2025 with 125 publications. China emerged as the most productive and influential country in terms of both publication volume and citation impact, while the most frequently used keywords were "e-commerce," "logistics," "cross-border e-commerce," and "sustainability." This study contributes to the literature by mapping the intellectual framework, thematic evolution, and global research trends in the fields of e-commerce logistics and technology management. Furthermore, it offers a guiding conceptual and analytical framework for future researchers who wish to investigate developments emerging in this interdisciplinary field.
SPILLOVER EFFECTS OF US MONETARY POLICY ON INFLATION RATE AND FX VOLATILITY IN TURKEY: A VECM ANALYSIS
(2026) Küçükgöde, Haydar Anıl; Çakır, Muhammet Sait
We aim to examine the effectiveness of the Central Bank of the Republic of Turkey’s (CBRT) monetary policy tools in reducing inflation and exchange rate volatility, given the spillovers emanating from the Federal Reserve’s (FED) policies between 2010 and 2022. Relying upon the vector error correction model methodology proposed by Johansen (1995), we found that the inflation rate, one of the main indicators of internal equilibrium conditions, is affected more strongly by global liquidity conditions than by the CBRT’s policies. Moreover, the evidence suggests that the long-term US interest rate proves to be the most disturbing factor to the exchange rate volatility in Turkey. More particularly, we show that the destabilizing effects of increases in the long-term US rates are stronger than the ability of the CBRT’s contractionary policies to fix internal and external disequilibria, which is evident in the erosion in the CBRT’s credibility. Given the devastatingly high economic and social costs associated with these rate hikes, the CBRT may instead turn to ways for enhancing the effectiveness of its policy tools by abandoning its unconventional policies. In this regard, it may start with restoring its highly damaged credibility and introducing some regulations restricting the free capital mobility.
