İstanbul Gelişim Üniversitesi Kurumsal Açık Erişim Arşivi

DSpace@Gelişim, İstanbul Gelişim 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

Öğe
The Impact of Financial Institution Quality and Financial Stability on Trade-Adjusted Carbon Emissions: The Moderating Role of Green Innovation and Environmental Taxes
(Multidisciplinary Digital Publishing Institute (MDPI), 2025) Radulescu, Magdalena; Yazıcı, Ayşe Meriç; Toy, Ayşegül; Öztırak, Mesut; Doğan, Mesut
This study analyzes the impact of financial institution quality (FIQ) and financial stability (FSI) on trade-adjusted carbon emissions (TAE) in G7 countries from 2000 to 2022. It also examines whether green innovation (GI) and environmental taxes (ET) moderate this relationship. In the study, long-term coefficient estimations were conducted using the Seemingly Unrelated Regressions (SUR), Panel-Corrected Standard Errors (PCSE), and Driscoll-Kraay standard error estimator methods. The results show that GI, ET, FIQ and FSI variables have a negative and significant effect on TAE. Green innovation and environmental taxes reduce carbon emissions, while strong financial institutions and stable financial systems enhance environmental performance by supporting sustainable investments. The Dumitrescu-Hurlin (D-H) causality test results indicate a unidirectional causal relationship between these variables to carbon emissions. These results highlight the significance of integrating environmental policies with financial systems and promoting GI for sustainable development.
Öğe
Sensitivity of the Load–Velocity Relationship Variables to Discriminate the Level of Fatigue Induced by Multiple Sets of the Hexagonal Barbell Deadlift Exercise
(NSCA National Strength and Conditioning Association, 2025) Şentürk, Deniz; Akyıldız, Zeki; Janicijevic, Danica; Garcia Ramos, Amador
S‚ ent ¨urk, D, Akyildiz, Z, Janicijevic, D, and Garc´ıa-Ramos, A. Sensitivity of the load–velocity relationship variables to discriminate the level of fatigue induced by multiple sets of the hexagonal barbell deadlift exercise. J Strength Cond Res 39(4): 407–413, 2025—This study aimed to evaluate changes in load–velocity (L-V) relationship variables (L0, v0, and Aline) after different fatigue protocols and to determine their correlation with changes in 1 repetition maximum (1RM). After determining the hexagonal barbell deadlift (HBD) 1RM, 27 resistance-trained men randomly completed 3 sessions that only differed in the activity performed between 2 incremental loading tests that were performed at the beginning (presession) and end (postsession) of the session: (a) control protocol: no training; (b) moderate-fatigue protocol: 5 sets of the HBD exercise at 70% 1RM performing half the maximum possible number of repetitions; and (c) high-fatigue protocol: 5 sets of the HBD exercise performed to failure against the 70% 1RM. Significance was set at an alpha level of 0.05. The reduction of 1RM (p , 0.001), v0 (p 5 0.014), and Aline (p , 0.001) at postsession was greater for the high-fatigue protocol, followed by the moderate-fatigue protocol, and finally the control protocol. The changes in L0 did not differ between the fatigue protocols (p 5 0.372). The percent change in the 1RM at postsession was significantly correlated with the percent change in Aline (r 5 0.714) and L0 (r 5 0.540), but not with the percent changes in v0 (r 5 0.177). These results suggest that the L-V relationship variables offer a highly sensitive and practical solution for fatigue monitoring.
Öğe
Influence of temperature and selenium substitution on electrical and dielectric characteristics of CoFe2O4 nanoparticles
(Elsevier B. V., 2025) Ünal, Bayram; Baykal, Abdülhadi; Almessiere, M. A.; Mihmanlı, Ahmet
This study investigates the influence of Se⁴⁺ ion substitution on the electrical and dielectric properties of CoFe2O4 nanoparticles (CoFe2-4xSe3xO₄ (x ≤ 0.1) (NPs)) synthesized via a hydrothermal method. The electrical and dielectric characteristics were analyzed using a Novocontrol dielectric impedance analyzer. Results indicate that activation energies (Ea) remain stable at approximately 600 meV at higher temperatures (T ≥ 45 ◦C) but decrease significantly at lower temperatures, ranging from 300 meV (x = 0.02) to 20 meV (x = 0.08). A sharp reduction in DC conductivity, from 1.2 nS/cm (x = 0.04) to 0.27 nS/cm (x = 0.08), suggests enhanced electron mobility at this substitution level. AC conductivity exhibits strong frequency dependence, increasing from 0.15 nS/cm at 1 kHz to 0.13 μS/cm at 1 MHz for x = 0.08 at room temperature. Dielectric constant (ε′) and loss (ε′′) values exhibit significant variation with frequency, with ε′ reaching a maximum of 3.95 at 100 Hz for x = 0.08, reflecting enhanced polarization effects. Se⁴⁺ substitution also increases the real part of the electrical modulus (ReM) to 0.99 and the imaginary part (ImM) to 0.40 for x = 0.10, indicating improved energy storage and dissipation capabilities. The ImZ/ReZ ratio analysis reveals shifts in conduction mechanisms and polarization effects, with a notable transition at x = 0.04. Cole-Cole plots suggest multiple relaxation processes influenced by temperature and substitution levels, with relaxation times decreasing from 13 ms (70 ◦C) to 0.76 ms (120 ◦C) for x = 0.02. This study highlights the potential of Se⁴⁺-substituted Co-SFs for applications in electronic devices, particularly in energy storage and dissipation systems, and underscores the need for combined experimental and theoretical approaches to optimize these materials for advanced technological applications.
Öğe
The Role of Artificial Intelligence Anxiety in the Relationship Between Organizational Learning and Performance in Organizations
(Ebru Bağcı, 2025) Şeker, Cemile; Kılıçaslan, Semiha; Karalinç, Turgay; Kaya, Aslı
The purpose of this study is to investigate the mediating role of artificial intelligence (AI) anxiety in the relationship between organizational learning and performance. The study sample consists of employees from the healthcare sector, specifically those employed at a private hospital in Istanbul. Data were obtained from 177 healthcare employees through the survey method. Statistical analyses were performed using SPSS 27 software, ensuring a 95% confidence interval. Initially, a normality test was conducted to examine the data distribution. Subsequently, a reliability analysis was carried out to ensure the dataset’s consistency, and an exploratory factor analysis (EFA) was applied to evaluate the factor structure. A correlation analysis was performed to determine the relationships between variables, followed by hierarchical regression analysis to assess the mediating role. The findings of the study demonstrate that AI anxiety does not have a significant mediating effect on the relationship between organizational learning and performance. These results suggest that the impact of AI anxiety on organizational dynamics requires further investigation. Given that AI anxiety can adversely influence organizational learning and reduce overall performance, organizations must take appropriate measures to mitigate concerns related to AI.
Öğe
The corrosion resistance effect of nanocomposites containing AuNPs coated onto titanium surfaces
(Yildiz Technical University, 2025) Yeni̇yol, Sinem; Mutlu, İlven; Di̇zman, H. Miraç; Arsu, Nergis
The purpose of this work was to evaluate the corrosion of commercially pure titanium (cpTi) and polymeric AuNPs nanocomposite thin film coatings on cpTi in vitro in artificial saliva by using different electrochemical tests and surface analysis techniques. Electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) and inductively coupled plasma mass spectrometry (ICP-MS) were associated with FESEM for surface characterization. OCP tests revealed higher potential values for AuNPs-Coated surfaces. Increase of the corrosion resistance for AuNPs-Coated surface was presented by EIS in artificial saliva. Average size of 20 - 30 nm AuNPs in spherical morphology forming agglomerations were observed on AuNPs-Coated surfaces. Compared to cpTi surfaces, a lower release tendency of Ti ions from the AuNPs-Coated Ti surfaces after immersion into artificial saliva was confirmed by ICPMS. Results suggest that AuNPs-Coated Ti surfaces exhibit an enhanced corrosion resistance.