Munzur ÜniversitesiMunzur ÜniversitesiAçık Erişim Arşivi · RDL Open

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  • MakaleAçık Erişim2025Scopus SJRQ1
    The effect of nursing services management efficiency on nurses’ professional commitment: A cross-sectional study

    Arslan Seker, Sevda; Coskun Palaz, Simge

    Aim: To determine the effect of nurses' perceptions of the effectiveness of nursing services management on their professional commitment. Background: Effective healthcare management is crucial for improving patient care quality. Understanding nurses' perspectives on nursing services management and their commitment provides valuable insights for management strategies, improving well-being and healthcare outcomes. Methods: This descriptive, cross-sectional, and correlational study involved 265 state hospital nurses. Data were collected between November 2020 and June 2021 using descriptive characteristic form, Nursing Services Management Effectiveness Scale, and Nursing Professional Commitment Scale. This study adhered to the STROBE checklist. Results: Nurses' views on the effectiveness of nursing services management and their professional commitment were found to be influenced by age, professional experience, and institutional positions. The average scores for nursing services management perception and professional commitment were 2.65 ± 0.72 and 66.63 ± 12.40, respectively. A statistically significant positive and low-level correlation was observed between nurses' nursing services management perception and professional commitment scores. Nurses' positive perception of nursing services management explains 17.1% of the variance in nurses' professional commitment levels. Discussion and conclusion: This study outlines how nurses' views on effective nursing services management can enhance their professional commitment. Managers should contribute to increase nursing services management efficacy by eliminating deficiencies in management practices to make their institutions successful and to increase their employees’ professional commitment level. Implications for nursing and health policy: Assuming positive perceptions of nursing management increase nurses' professional commitment, developing policies to boost organizational support is vital. Managers should focus on improving nursing services management to increase organizational success, increase nurses' professional commitment, and achieve the best health outcomes by eliminating management deficiencies.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    AtıfOpenAlex2
    ScopusWeb of SciencePubMedİncele
  • MakaleYalnız künye2025Scopus SJRQ3
    Negative Outcome Expectation as a Barrier for Knowledge Sharing: Conceptualisation and Measurement Development

    Uyan, Umut

    Knowledge sharing has become the critical success factor for effective knowledge management since it bridges the gap between knowledge creation and utilisation. So far, socio-psychological factors have yet to attract the attention of scholars despite numerous barriers impeding the flow of knowledge. The current study is, therefore, designed to develop a self-reporting measurement instrument that uncovers hidden sharing barriers triggered by negative outcome expectations. To test the psychometric properties of the newly designed instrument, a stepwise procedure was applied. The findings indicate that the instrument aimed at developing is a multidimensional construct consisting of 13 items and four dimensions (assumption of being ignored, assumption of not meeting expectations, assumption of being non-sense and assumption of conflict avoidance). The results of this study provide preliminary evidence for the reliability and validity of the 13-item negative outcome expectation scales as a measure of hidden assumptions towards knowledge sharing.

    ScopusWeb of Scienceİncele
  • MakaleYayıncıda açık erişim2025Scopus SJRQ1
    Effectiveness of flipped classroom model in distance education: An experimental study in Turkish language course

    Aslan, Seda Aktı; Turgut, Yigit Emrah; Ünlü, Gökhan; Allison, Jordan

    This study investigates the impact of the Flipped Classroom Model (FCM) on university students’ learning achievement, self-directed learning skills (SLS), and course interaction within the context of live online classes (LOC). Employing a 14-week quasi-experimental design, the research involved an experimental group (n = 34) exposed to the FCM and a control group (n = 25) taught through traditional methods. Pre-tests indicated that the groups were not statistically different at baseline. Post-intervention analyses revealed no statistically significant differences between the groups in terms of immediate learning achievement or course interaction. However, results from a delayed post-test indicated that students in the experimental group demonstrated significantly higher retention of learning content compared to their counterparts. No significant improvements were observed in self-directed learning skills, suggesting that the FCM, as implemented, may not effectively foster such competencies across all learners. Furthermore, the model did not significantly enhance student interaction in the online classroom environment. These findings suggest that while the FCM may support long-term retention, its overall impact on achievement, interaction, and the development of SLS in LOC settings is limited and may be moderated by students’ existing self-regulatory capacities.

    • SDG 4 · Nitelikli Eğitim
    ScopusWeb of SciencePubMedİncele
  • MakaleYalnız künye2025Scopus SJRQ1
    Using Camelina Seed Mucilage as a Fat Replacer in the Production of Cookies and Its Effect on Physicochemical and Technological Properties

    Ozcan, Yasemin; Ozdemir-Orhan, Necla; Eroglu, Zeynep; Yilmaz, Merve Silanur

    In this study, for the first time, camelina (Camelina sativa (L.) Crtz.) seed mucilage (CM) was used as a fat substitute in a cookie formula, and the physicochemical, textural, and functional properties of mucilage-incorporated cookies were investigated. The moisture, protein, ash, fat, and carbohydrate content of the CM was 6.46% ± 0.35%, 17.44% ± 0.62%, 11.49% ± 0.39%, 1.27% ± 0.10%, and 63.16% ± 0.58%, respectively. Fourier transform infrared (FTIR) spectroscopy identified acidic (–COOH) functional groups in the CM. Four distinct cookie samples were examined: The control-cookie, 20% CM-cookie, 40% CM-cookie, and 60% CM-cookie were prepared by replacing shortening with CM at 0%, 20%, 40%, and 60% levels, respectively. The mucilage-incorporated doughs were softer, springy, cohesive, and resilient compared to the control dough (p < 0.05). As for the cookies, the fat content of the 20% CM-cookie, 40% CM-cookie, and 60% CM-cookie samples decreased by 12.52%, 31.49%, and 50.12%, respectively, compared to the control-cookie. The control-cookie had the lowest baking loss (p < 0.05), and the baking loss values of the mucilage-incorporated cookies increased with increasing fat replacement level. The highest spread ratio was recorded in the 20% CM-cookie, followed by the control-cookie (p < 0.05). The highest hardness and brittleness values (70.68 ± 3.37 N and 11.52 ± 0.34 mm) belonged to the 60% CM-cookie, whereas the lowest (19.42 ± 1.42 N and 8.80 ± 0.26 mm) belonged to the control-cookie (p < 0.05). Incorporating mucilage into the cookie formula increased the total phenolic compound content but decreased the antioxidant activity. These results show that CM has potential utility as a fat substitute in cookie production without significant quality loss.

    • SDG 2 · Açlığa Son
    AtıfScopus3WoS2OpenAlex3
    ScopusWeb of SciencePubMedİncele
  • MakaleAçık Erişim2025Scopus SJRQ4
    Biochemical Responses of Zebra Mussel Dreissena polymorpha (Pallas, 1771) (Bivalvia: Dreissenidae) against Cadmium

    Alişer, Ahmet Bedrettin; Aydin, Rahmi; Serdar, Osman

    The biochemical reactions of zebra mussels Dreissena polymorpha (Pallas, 1771) exposed to different concentrations of cadmium (Cd) in the acute period (24 and 96 hours after treatment) were studied. Four variants of experimental treatment were examined: 0 μg/L Cd (control), 10 μg/L Cd, 20 μg/L Cd and 40 μg/L Cd. Changes in the enzyme activities of superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), glutathione (GSH) and thiobarbituric acid reactive substances (TBARS) levels were determined using ELISA kits. In D. polymorpha exposed to the three experimental concentrations of cadmium, there was a statistically significant decrease (p<0.05) in SOD enzyme activity with increasing concentration or exposure times. No change was observed in CAT enzyme activity with increasing concentrations. The decrease in the activity depending on the exposure times was not statistically significant (p>0.05). As for GPx enzyme activity, a significant increase was detected after Cd application compared to the control (p<0.05). TBARS and GSH levels increased significantly in all Cd application groups compared to the control at 24 and 96 hours. The effects of different concentrations of Cd on D. polymorpha in the acute period were associated with changes in SOD, CAT, GPx enzyme activities. TBARS and GSH levels were effective parameters in determining the oxidative damage caused by Cd.

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  • MakaleAçık Erişim2025Scopus SJRQ1
    Self-Compassion Around the World: Measurement Invariance of the Short Form of the Self-Compassion Scale (SCS-SF) Across 65 Nations, 40 Languages, Gender Identities, and Age Groups

    Swami, Viren; Tran, Ulrich S.; Voracek, Martin; Aavik, Toivo; Ranjbar, Hamed Abdollahpour; Adebayo, Sulaiman Olanrewaju; Afhami, Reza; Ahmed, Oli; Aimé, Annie; Akel, Marwan

    Objectives: The 12-item Self-Compassion Scale–Short Form (SCS–SF) is a widely used instrument for the assessment of self-compassion. To date, there have been few examinations of this instrument’s psychometric properties, particularly across nations and languages. Therefore, we used data from the Body Image in Nature Survey (BINS) to assess measurement invariance of the SCS–SF across nations, languages, gender identities, and age groups. Methods: Participants (N = 56,968) from 65 nations completed the SCS–SF in 40 languages. Using these data, we tested various hypothesised models of the SCS–SF in the total sample and, using multi-group confirmatory factor analysis, tested for invariance of the optimal model across national groups, languages, gender identities, and age groups. Results: In the total dataset, we found that an 11-item, 2-factor model (i.e., SCS-11) provided best fit to the data, with the two factors tapping distinct constructs of compassionate and uncompassionate self-responding. The SCS-11 was found to be partially scalar invariant across national groups and languages, and fully scalar invariant across gender identities and age groups. There was wide variation in latent means for the two factors, particularly across national groups and languages. Further analyses showed negligible associations between the two factors and sociodemographic variables, including marital status, financial security, and urbanicity. Conclusions: Our results suggest that it may be possible to derive a stable 2-factor model of the SCS–SF for use in cross-cultural research, but also highlight the likelihood of cross-national and cross-linguistic variations in the way that self-compassion is understood.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    AtıfScopus21OpenAlex23
    ScopusWeb of Scienceİncele
  • MakaleAçık Erişim2025Scopus SJRQ1
    New comparative approach to multi-level thresholding: chaotically initialized adaptive meta-heuristic optimization methods

    Serbet, Fatmanur; Kaya, Turgay

    One method aimed at enhancing the performance of meta-heuristic optimization techniques is the incorporation of chaotic systems. Instead of irregular distributions in the search space, chaotic distributions are employed in the initial population of optimization algorithms to improve the efficiency of the search process. This approach enables search agents distributed in a chaotic manner to effectively explore the search space. The initial populations of both the well-established PSO algorithm and the enhanced WSO algorithm, which incorporates advanced search techniques, are distributed in the search space according to the characteristics of Logistic, Chebyshev, Circle, Sine, and Piecewise chaotic maps in this study. The original PSO and WSO algorithms, as well as the resulting chaotically initialized PSO and chaotically initialized WSO algorithms, were tested using 23 benchmark functions. Subsequently, the Otsu method was integrated into the tested optimization algorithms to obtain multi-level thresholding values. These algorithms were applied to five different test images with a manually determined number of thresholds. The results obtained were presented in the study and evaluated using statistical tests.

    AtıfScopus13OpenAlex12
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  • MakaleYalnız künye2025Scopus SJRQ2
    Influence of putrescine treatment on quality and biochemical characteristics of hawthorn fruit during cold storage

    Kucuker, Emine; Aglar, Erdal; Ogurlu, Ferhat; Ozcengiz, Ceyda Kizgin; Sumbul, Ahmet

    Post-harvest quality and product losses are significant for hawthorn fruits, which have a short shelf life and limited marketing period. This study examined the effects of putrescine applications to maintain the physical quality and biochemical contents of hawthorn fruits and extend their shelf life during cold storage. Hawthorn fruits were treated with different doses of putrescine (0.5 mM, 1 mM, and 2 mM) and stored for 30 days. The effects of putrescine applications on weight loss, decay rate, fruit firmness, soluble solids content (SSC), titratable acidity (TA), total phenolic content, total antioxidant content, individual phenolic compounds, and organic acid properties were evaluated on the 10th, 20th, and 30th days of storage. At the end of the cold storage, the lowest weight loss and decay rate and the highest fruit firmness were observed in the 1 mM putrescine application. In general, putrescine applications maintained total phenolic content, with the increase in total antioxidant content continuing until the 20th day. The highest increase in total phenolic and total antioxidant content was observed with the 1 mM putrescine application. Succinic acid, a decreasing phenolic compound, was identified as the primary acid in hawthorn fruits throughout storage. The storage period and putrescine application dose caused increases and decreases in phenolic compounds. Gallic acid was determined as the highest phenolic compound in hawthorn fruit. The 1 mM putrescine application was found to be the most effective application for organic acids and phenolic compounds. Putrescine, one of the main polyamines, was shown to be an effective method for maintaining the quality and shelf life of hawthorn fruit. Additionally, this study is expected to serve as a foundation for future similar studies.

    • SDG 2 · Açlığa Son
    AtıfScopus4WoS4OpenAlex3
    ScopusWeb of Scienceİncele
  • MakaleAçık Erişim2025Scopus SJRQ2
    In vitro and in silico analyses of cytoprotective, antigenotoxic and antimutagenic potential of Phlomis pungens var. hirta extracts against oxidative damage

    Wild Korkmaz, Franziska Johanna; Dogan, Serap; Yilmaz Kardas, Begumhan; Diken, Mehmet Emin; Karasakal, Ömer Faruk; Acar, Mikail

    Phlomis pungens var. hirta Velen has been used by local people for food and to treat diseases but there are limited number of investigations in literature about this plant and cyto/genotoxicity analyses have not been done before. Hence, this study aimed to find out cell-protective activity and DNA damage prevention ability of P. pungens var. hirta by MTS, micronucleus, 8-OHdG and somatic mutation recombination tests (SMART). In addition, liquid chromatography, antioxidant/antibacterial activity analyses and in silico biological activity profiling were performed. The healthy lymphocyte cell growth was supported by the plant extracts and none of the extracts was genotoxic. 8-OHdG test showed that methanolic and ethanolic extracts of the plant were able to decrease the oxidative DNA damage. According to the SMART results, extracts could suppress the genotoxic effects of an important environmental pollutant, H2O2. Rutin hydrate and quercetin were found in highest concentrations and the extracts could be characterized as antioxidant/antibacterial. In silico analysis also showed that the major compounds of this plant can be considered as chemoprotective. This is the first study that assessed the cell protective activity and DNA damage prevention capacity of P. pungens var. hirta, which should be regarded as a potential source for nutritional supplements and therapeutic products.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    AtıfOpenAlex1
    ScopusWeb of Scienceİncele
  • MakaleAçık Erişim2025Scopus SJRQ2
    Tungsten carbide-based shape memory biopolymer nanocomposites as a promising new gamma radiation shielding material

    Pekdemir, Mustafa Ersin; Yılmaz, Demet; Selçuk Pekdemir, Sibel; Taşgın, Yahya; Ekmen, Busenur

    In this study, structural, thermal and radiation shielding properties of Polylactic acid (PLA)/polyhydroxyalkanoates (PHAs)/Tungsten Carbide (WC) nanocomposite films were investigated. PHA/PLA/WC composite films were prepared by using different amounts of WC (5%, 10%, 18%, 28%). Characterization of the composite films was carried out by Attenuated Total Reflection Infrared Spectroscopy (ATR-IR), Thermogravimetric Analysis (TGA), Differential Scanning Calorimetry (DSC), X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The linear and mass attenuation coefficients (LAC and MAC), mean free path (MFP), Half-Value Layer (HVL), Tenth Value Layer (TVL), effective atomic numbers (Zeff), and effective electron densities (Nel) of the synthesized composite films were experimentally measured from 53.16 to 383.85 keV. Also, the neutron equivalent dose rates for the prepared film samples were determined. Exposure buildup factor (EBF) and fast neutron removal cross section (ΣR) were theoretically calculated. The particle shielding characteristics of the composite films were evaluated. The MFP values at 356.01 keV are 8.211 cm, 7.772 cm, 7.360 cm, 6.710 cm and 5.942 cm for PLA/PHA, PLA/PHA/5%WC, PLA/PHA/10%WC, PLA/PHA/18%WC and PLA/PHA/28%WC, respectively. It was observed that an increase in WC content enhances the gamma shielding abilities in PHA/PLA films. The results revealed that PHA/PLA/WC composite materials can be used as protective coating materials.

    AtıfScopus5WoS5OpenAlex6
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  • Kitap BölümüYalnız künye2025
    Transparency and Reverse Transparency: Understanding Digital Leadership in Light of Agency Theory

    Sezgin, Eray Ekin

    We live in a digital world where most of our work and life experiences are based on information technologies and the internet. Developments in information technologies affect not only business life but also our social and community lives. Leading in the digital age is much more difficult and complex than leading in a world with no opportunities and no technology. Transparency is critical to digital leadership. The increase in the volume of data with developing technologies leads to increased transparency in organizations and has a significant impact on leadership. However, this also brings challenges. On the one hand, transparency facilitates employee empowerment, but on the other hand, it raises concerns about employee oversight and confidentiality. Moreover, transparency has traditionally been a one-sided construct where control is given to managers, leading to a panoptic scenario. To overcome these concerns and challenges, it is imperative to design new forms of control. In this regard, the contemporary workforce demands reverse transparency in the context of agency theory. Although the concepts of (reverse) transparency, leadership and digitalization are interrelated, there is a research gap on the relationship between the three. By analyzing the theoretical concept through the lens of control and outlining a conceptual implementation process, this study is of an explanatory theoretical nature. The study sheds light on the understanding of the problems related to transparency and reverse transparency in the contemporary workforce and contributes further to the theoretical discourse.

    Scopusİncele
  • MakaleAçık Erişim2025Scopus SJRQ1
    A novel post-processing approach for improving minimum nonlinearity in S-boxes: A case study based on 2D hyper chaotic Schaffer transformation map

    Aydın, Yılmaz; Garipcan, Ali Murat; Özkaynak, Fatih

    Substitution boxes (s-boxes), providing nonlinearity in block cipher algorithms, constitute a fundamental security layer against linear and differential cryptanalysis attacks. In this study, an innovative s-box generation method is proposed by integrating a 2D hyper-chaotic Schaffer map (SM) with biomolecular DNA-based encoding techniques. Furthermore, to enhance the security of s-box structures, a novel post-processing algorithm is developed, aiming to simultaneously optimize both the average (NLavg) and minimum (NLmin) nonlinearity levels by targeting linear components. Unlike traditional meta-heuristic methods, the proposed algorithm avoids random exploration across large search spaces, instead identifying dominant linear components through Walsh spectrum analysis and applying targeted permutation operations to suppress their effects. This strategy not only increases the NLavg value but also balances the contribution of each Boolean function to security, thereby establishing a homogeneous and consistent security structure across all input–output combinations. Comparative experimental analyses with existing methods demonstrate that the proposed approach outperforms prior techniques in terms of both cryptographic security metrics and computational efficiency. In this respect, the study presents an advanced s-box design framework, characterized by high nonlinearity and a balanced spectral distribution, suitable for integration into modern block cipher systems.

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  • MakaleAçık Erişim2025Scopus SJRQ2
    Associations Between Pulmonary Function and Muscle Strength in Turkish National Karate Athletes

    Tokgoz, Gurkan; Cinarli, Sena; Akyol, Betül; Aygoren, Caner; Beykumul, Aysegul; Larsen, Malte Nejst; Krustrup, Peter; França, Cíntia; Gouveia, Élvio Rúbio; Cinarli, Fahri Safa

    Background: Respiratory efficiency is considered important in karate due to its role in sustaining muscular performance during high-intensity actions. This study examined the association between pulmonary function and isometric muscle strength in national-level karate athletes. Methods: A total of 23 elite karate athletes (mean age: 23.0 ± 2.3 (mean ± SD) years) participated in the study. Pulmonary function was assessed using a digital spirometer, while isometric handgrip, lower back, and leg strength were measured using a dynamometer. The correlation between pulmonary function and isometric strength was analyzed, and linear regression was employed to examine the predictive capacity of pulmonary parameters for muscle strength. Results: The results revealed significant correlations, ranging from large to very large, between pulmonary function and isometric muscle strength, with correlation coefficients from 0.639 to 0.812 (p < 0.01). Pulmonary function was strongly associated with isometric strength, accounting for 27% to 67% of the variance (p < 0.05). Multiple regression analysis revealed that pulmonary function parameters accounted for 71% of the variance in handgrip strength, 47% in leg strength, and 71% in back strength (p < 0.05). Conclusions: These findings highlight the strong associations between pulmonary function and isometric muscle strength in elite karate athletes. The results emphasize the importance of pulmonary health and respiratory muscle function in athletic performance, particularly for sports requiring high-intensity, dynamic movements like karate. Future longitudinal studies are needed to explore the mechanisms underlying the association and potential implications, and for training and performance optimization.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    ScopusWeb of SciencePubMedİncele
  • MakaleAçık Erişim2025Scopus SJRQ1
    Examining the trade-off between structural, mechanical properties and shielding performance of Pr2O3-enhanced 316L stainless steel

    Yayla, Nihal; Albayrak, M.Gökhan; Güler, Ömer; Baykal, Duygu Sen; Alkarrani, Hessa; ALMisned, Ghada; Zakaly, Hesham M.H.; Tekin, H.O.

    This study explores the structural, mechanical, and radiation shielding properties of 316L stainless steel composites reinforced with varying weight percentages of Pr2O3. The aim is to enhance radiation attenuation capabilities while maintaining structural integrity for nuclear applications. The composites were fabricated using the mechanical alloying method, followed by detailed characterization through X-ray diffraction, scanning electron microscopy, and energy-dispersive X-ray spectroscopy. Key radiation shielding parameters, including mass attenuation coefficient, linear attenuation coefficient, half-value layer, and effective atomic number, and transmission factor values were analysed using theoretical and computational models. Additionally, elastic modulus calculations were performed to assess mechanical properties. The results indicate that incorporating Pr2O3 significantly enhances shielding performance. The 316L-SS%20Pr2O3 composite exhibited the highest mass and linear attenuation coefficients values, with a notable reduction in half value layer values compared to the unreinforced 316L stainless steel. At lower photon energies, effective atomic number improved by 39.3 % for the 316L-SS%20Pr2O3 sample, while neutron shielding efficiency also increased. However, the elastic modulus decreased with higher Pr2O3 content, reflecting a trade-off between mechanical stiffness and radiation shielding efficiency. The findings demonstrate that 316L-SS%20Pr2O3 is a promising material for applications requiring superior radiation shielding, particularly in environments where mechanical load is secondary.

    AtıfScopus8OpenAlex8
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  • MakaleAçık Erişim2025Scopus SJRQ1
    Quality preservation of jujube fruit during cold storage: effect of maturity stage and modified atmosphere packaging

    Gun, Sefa; Ozturk, Burhan; Aglar, Erdal; Karakaya, Orhan

    Bacground: This study, which examines the effect between the maturity stage and modified atmosphere packaging (MAP) in order to prevent post-harvest quality losses and extend the storage life of jujube (Ziziphus jujuba Mill.) fruit, offers an important contribution to supply chain management. The fruits harvested at different maturity stages were stored at 0 ± 0.5 °C and 90 ± 5 RH in MAP and control conditions for 42 d and changes in quality, physiological and biochemical parameters were evaluated. Results: The lowest value was recorded in the early maturity (M-1) + MAP group for weight loss. Respiration rate decreased with advancing maturity, MAP treatments slowed down this process. Oxygen consumption and CO₂ production changed according to maturity level, MAP applications balanced gas exchange. MAP maintained brightness and color intensity of the fruit better. It also slowed down the firmness loss. The highest soluble solid content (SSC) was determined in the late maturity (M-3) + MAP group. Titratable acidity (TA) showed lower increase in MAP treatments. MAP significantly reduced the losses of vitamin C. Total phenolic, total flavonoids and antioxidant activity decreased during storage, while MAP treatments limited this decrease. Conclusions: The findings revealed that packaging jujube fruit with MAP, especially in early and mid-maturity stages, better preserves its quality parameters. Accordingly, MAP applications appropriate to the ripeness stage are recommended as an effective strategy to extend the fresh consumption period of jujube fruit and preserve its bioactive compounds.

    • SDG 2 · Açlığa Son
    AtıfScopus6WoS5OpenAlex5
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  • MakaleAçık Erişim2025Scopus SJRQ2
    Innovative image encryption approach based on bitwise XOR high nonlinear S-boxes and random permutation

    Artuğer, Fırat

    With today's developing technologies, the need for new image encryption algorithms to encrypt images is inevitable. In this study, an innovative image encryption algorithm is proposed. The proposed algorithm first XORs each layer of the image with a unique and strong new key. Each layer is then subjected to a random permutation process. Each of the encrypted layers obtained here is finally passed through a new s-box structure with a high nonlinearity value. After these processes, all layers are combined to obtain an encrypted image. Thus, XOR and s-box confusion meet the criteria, while random permutation meets the diffusion criteria. In this study, both key and s-box structures were originally obtained with a chaotic Gaussian map. The outputs of the chaotic map were converted into bit sequences and five different sequences with a length of 1 million were obtained. All these arrays have successfully passed all NIST SP 800-22 tests. On the other hand, the proposed s-box structures surpassed many studies with nonlinearity values of 108, 108.5, and 108.75. The images were successfully encrypted with the proposed algorithm, and the encrypted images successfully completed tests such as NPCR-UACI, information entropy, histogram analysis, and correlation analysis. It is thought that this study will make many contributions to the fields of s-box development, random number generation, and image encryption.

    AtıfScopus3OpenAlex3
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  • MakaleAçık Erişim2025Scopus SJRQ2
    A Novel CuAlMnFe/CeO2 Composite Alloy: Investigating the Wear and Corrosion Features

    Doğan, Fatih; Duru, Erhan

    Shape memory alloys (SMAs) are known for their exceptional mechanical properties, particularly their superior wear resistance compared to conventional alloys with similar surface hardness. Rare earth oxides are often used as additives to further improve these characteristics. This study investigates the effects of different CeO2 (cerium dioxide) concentrations (0.01 wt.%, 0.1 wt.%, 0.5 wt.%, and 1.0 wt.%) on the properties of CuAlMnFe alloys produced via powder metallurgy (PM). Various analyses were performed, including scanning electron microscopy (SEM), Energy Dispersive Spectroscopy (EDS), X-ray diffraction (XRD), as well as hardness, wear, and corrosion tests. The increase in wear rate is closely related to the formation of precipitates from CeO2 addition. Improvements in wear resistance and hardness are attributed to the effects of grain refinement and solid solution strengthening due to CeO2. Specifically, the wear rate increased from 1.5 × 10−3 mm3/(Nm) to 3.4 × 10−3 mm3/(Nm) with higher CeO2 content. Additionally, the friction coefficient of the CuAlMnFe alloy was reduced with CeO2 addition, indicating enhanced frictional properties. The optimal CeO2 concentration of 0.5% was found to improve grain uniformity, resulting in better wear resistance. Incorporating CeO2 particles into CuAlMnFe alloy enhances hardness and reduces wear rate when used in appropriate amounts. Additionally, it exhibits superior corrosion resistance, as evidenced by a positive shift in corrosion potential in Tafel measurements in solutions and a decrease in corrosion current density. The C0.5 specimen showed the highest corrosion potential (Ecorr, −588 V) and the lowest corrosion current density (icorr, 6.17 μA/cm2) during electrochemical corrosion in 3.5 wt.% NaCl solution.

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