Sürdürülebilir Kalkınma Amaçları
Yazarlar
- Kaygusuz, Abdullah(35)
- Sipahi, Ferkan(35)
- Karsli, Orhan(34)
- Dokuz, Abdurrahman(30)
- Duran, Celal(30)
- Kandemir, Raif(29)
- Ozdes, Duygu(28)
- Maden, Nafiz(27)
- Uzun, Sevda(27)
- Merdan, Mehmet(26)
- Vural, Alaaddin(26)
- Öztürk, Serkan(25)
- Araz, Onur(24)
- Kulakaç, Nurşen(24)
- Ashyralyyev, Charyyar(23)
- Yildiz, Salih(23)
- Yilmaz, Ozgur(23)
- Doğan, Kadir Caner(21)
- Arslan, Mehmet(20)
- Aydin, Faruk(20)
- Doğru, Bülent(20)
- Bayraktar, Alemdar(19)
- Kankal, Murat(19)
- Ayaydin, Hasan(18)
- Baltaci, Cemalettin(18)
- Yolcu, Halil(18)
- Cakir, Tufan(17)
- Cengiz, Ekrem(17)
- Demir, Selim(17)
- Gücer, Mehmet Ali(17)
- Akaryali, Enver(16)
- Artan, Seyfettin(16)
- Hayaloğlu, Pınar(16)
- Kaya, Afşin Ahmet(16)
- Tosunoğlu, Büşra(16)
- Uysal, Ibrahim(16)
- Kurt, Kemal(15)
- Ozturk, Samet(15)
- Reis, Hatice Catal(15)
- Aksakal, Vecihi(14)
Yayınlar
- MakaleYalnız künye2026The Impact of Financial Stability, Globalization, and Economic Stability on Ecological Footprint From the Perspective of EKC Hypothesis: New Evidence From a Fourier Panel Data Analysis for BRICS-T Countries
Sancar, Canan; Akbaş, Yusuf Ekrem; Suluk, Seher; Atay Polat, Melike; Aslan, Alper
The Environmental Kuznets Curve hypothesis, which states that the increase in growth up to a certain income level increases environmental pollution and the increase in growth after reaching this income level decreases environmental pollution, has recently started to be investigated by including economic development and financial development in the framework of this hypothesis to better investigate the hypothesis. This study aims to investigate the impact of financial stability, economic stability, globalization, energy use, and growth on the ecological footprint in Brazil, Russia, India, China, South Africa, and Turkey. In addition, the Environmental Kuznets Curve hypothesis is also tested while examining this relationship. The Panel Fourier approach is applied to test these relationships in Brazil, Russia, India, China, South Africa, and Turkey over the period 1996–2022. The coefficient estimation results show that economic stability, economic globalization, growth, and energy use have a positive impact on the ecological footprint in Brazil, Russia, India, China, South Africa, and Turkey, but financial stability reduces the ecological footprint. Moreover, an inverted-N relationship was found between economic growth and pollution in these countries, which means that the Environmental Kuznets Curve is invalid in these countries in the relevant period. The results obtained from causality analysis support the results of coefficient estimation. Accordingly, a unidirectional causality was found from explanatory variables to the ecological footprint in most of Brazil, Russia, India, China, South Africa, and Turkey.
- MakaleYalnız künye2026Analytical Solution of Discontinuous Contact Problem in Functionally Graded Layer and Homogeneous Layer
Kaya, Yusuf; Polat, Alper; Şükrü Özşahin, Talat; Bora, Pınar
In the study, the problem of discontinuous contact in two layers, one of which is functionally graded is solved using the theory of elasticity. In this problem functionally graded (FG) layer resting on homogeneous layer and loaded with two different rigid flat blocks. In addition, homogeneous layer is resting on a rigid plane. Frictions on all surfaces are neglected. The heights of the FG layer and the homogeneous layer are h1 and h2, respectively. When solving the problem, displacement and stress equations are substituted in the boundary conditions. Then the problem is demained to singular integral equations. Wherein unknown functions are the contact stresses under the two rigid flat blocks and the slope of the separation. These singular integral equations are solved numerically using the Gauss- Chebyshev integration formulas. The analyzes were performed for different inhomogeneity parameter (βh1), shear modulus ratio (μ2/μ-h1). distance between the rigid blocks ((a3-a2)/h1) and density parameter (γh1). Consequently, the stress distributions and starting and ending points of the separation area between the FG layer and homogeneous layer are determined for several dimensionless quantities.
- MakaleYalnız künye2026Improved generalized ratio estimators of population mean using auxiliary variables
Yadav, Subhash Kumar; Arya, Diksha; Sharma, Prayas; Zaman, Tolga
The Quest for the improved estimators of population mean is a continuous process to estimate it more efficiently and more closely to the true population mean of the study variable. There are various estimators of population mean in the literature, which estimate it efficiently, but still there is space for more efficient estimators. For improved estimation of population mean of primary variable, we suggest six different searls type ratio estimators utilizing the known auxiliary parameters. We derive the expressions for the biases and the mean squared errors of the introduced estimators for an approximation of degree one. The optimal values of the Searls characterizing constants, which minimize the mean squared errors of the introduced estimators, are obtained. The least value of the mean squared error of the proposed estimators for these optimal values of the characterizing scalars is also acquired. The efficiency of the proposed estimators is compared theoretically with the competing estimators of population mean through their mean squared errors. We derive the efficiency conditions of the proposed estimator for which it is more efficient than the estimators of population mean in competition. These efficiency conditions of the proposed estimators are verified through empirical data and the improvement over the competing estimators is calculated based on the minimum values of the mean squared errors. It is evident from the numerical study that the proposed estimator has the least mean squared error and the highest percentage relative efficiency in comparison to competing estimators. Thus, the proposed estimators are recommended for applications in different areas of applications.
- MakaleYalnız künye2026Do special economic zones support regional development in transition economies? The case of Kazakhstan
Önder, Kübra; Şahin, Muhammet
This study examines the impact of Special Economic Zones (SEZs) in Kazakhstan between 2000 and 2023 on regional development, explicitly accounting for institutional and spatial heterogeneity. For causal identification, it employs a Forward Orthogonal Deviations-based GMMf (System GMMf) estimator to address endogeneity and reverse causality, complemented by an event-study framework to trace the dynamic evolution of policy effects. The results reveal strong path dependence in regional growth and show that the effectiveness of SEZ incentives is non-linear and systematically conditioned by the depth of regional production structures, proxied by the Value Added Index. Empirical evidence suggests that SEZ incentives stimulate growth in low value-added regions, while potentially distorting market signals and generating crowding-out effects in regions with high value-added production. Dynamic analyses indicate that the negative shock observed immediately after implementation reflects temporary adjustment costs and resource reallocation, with effects converging towards zero over time. Overall, the findings imply that SEZs are not automatic engines of growth but require careful calibration to local production structures to mitigate risks of policy saturation and adverse selection. The study provides an original contribution to the literature on the design and life-cycle management of next-generation industrial policies in transition economies.
- MakaleYayıncıda açık erişim2026Blinking without eyelids: first video-documented evidence of a blink-like reflex in Ophisops elegans (Reptilia: Lacertidae)
Çelebi, Turan Meriç; Çelikağı, Yusuf; Kınay, Tuana; Kuyucu, Arda Cem; Kurnaz, Muammer; Şahin, Mehmet Kürşat
Eyelids play a crucial role in protecting the eyes of vertebrates; however, certain reptile species, such as Ophisops elegans, completely lack movable eyelids. In this study, we present the first video-documented evidence of a blink-like reflex in O. elegans, captured through endoscopic field observations and corroborated by laboratory video analysis. The observed movement consisted of a brief convex deformation of the ocular surface, lasting approximately 0.3 s and resembling a blink despite the presence of a fixed transparent brille. This behavior was observed once in the field and twice under controlled laboratory conditions. We propose that O. elegans may employ subtle contractions of the ocular musculature to mimic the protective function of blinking. These findings indicate a novel compensatory mechanism in eyelidless lizards and underscore the need for further research into ocular adaptations among reptiles.
- MakaleYalnız künye2026Valorization of tea industry waste into boric acid–activated carbon for phenol removal from aqueous solutions
Duran, Celal; Ozdes, Duygu; Ozdemir, Olcay; Onal, Yunus; Gundogdu, Ali
The tea industry generates substantial quantities of solid waste with limited high-value industrial applications. In this study, tea industry waste was converted into boric acid-activated carbon (BA–TAC) through a simple one-step chemical activation process and evaluated as an adsorbent for phenol removal from aqueous solutions. BA–TAC exhibited a mixed micro–mesoporous structure with a BET surface area of 592.59 m2 g−1. The adsorption performance was investigated as a function of solution pH, contact time, and initial phenol concentration. Adsorption kinetics were evaluated using pseudo-first order, pseudo-second order, Elovich, Avrami, and intraparticle diffusion models, whereas equilibrium data were analyzed using Langmuir, Freundlich, and Sips isotherms. Linear, pseudo-linear, and non-linear regression approaches were comparatively evaluated, demonstrating the limitations of conventional linearization and the superiority of direct non-linear regression. Moreover, the so-called linearized forms of multi-parameter models such as Sips are not truly linear because iterative parameter estimation remains necessary. The maximum experimental phenol adsorption capacity reached 101.80 mg g−1 despite the moderate BET surface area of BA–TAC. The experimentally determined natural pH and pHpzc values, together with the limited desorption efficiency, indicated that adsorption was governed predominantly by surface chemical interactions rather than electrostatic attraction alone. XPS analysis confirmed the incorporation of boron-containing surface functionalities, highlighting their contribution to phenol adsorption. Overall, this study demonstrates the successful valorization of tea industry waste into a functional boron-modified activated carbon while providing methodological guidance for reliable adsorption kinetics and equilibrium modeling, thereby supporting sustainable waste valorization.
- BildiriYalnız künye2026Advancing Digital Wallet Security Through Multi-Factor Authentication and Homomorphic Encryption-Based Privacy Preservation
Genemo, Musa Dima; Kumar, Kotha Anil; Sadat, Quazi Taif; Santosh, Kathari; Sreeram, G.; Raj, I. Infant; Dash, R.; Rautray, R.; Mishra, S.K.
Digital wallets have been provided by FinTech businesses thus reengineering the financial services but nonetheless there is a possibility of keyloggers, bogus personas and assaults of the server with conventional systems using PIN authentication. The current multi-factor authentication configuration usually leaves sensitive biometric information exposed as the logins are processed. To address these security issues, the paper proposes the MHESecAuth that employs Multi-Factor Homomorphic Encryption and Smart Contracts to authenticate. The permission to make transactions is secure since the system operates with PINs, OTPs and no one can view the biometrics. As per experimental research, the system can be accurate at 96.4 percent, false acceptance rate is 0.08 percent, false rejection rate is 0.6 percent and encryption consumes 160ms. The framework optimizes security, privacy and performance against both MFA, encryption-only and combined solutions and is therefore suitable in the development of quantum-secure digital wallets and still blockchain-based audit and transparency.
- MakaleYalnız künye2026Intensive care nurses' perspectives on the quality of nurse-patient communication in the prevention and management of delirium: A qualitative study
Şengün Inan, Figen; Canbolat, Özlem; Aslan, Kübra; Tuncer, Gülsüm Zekiye
Background Nurses play a key role in the care of patients with delirium; however, there is a lack of research exploring intensive care nurses' communication-related experiences in this context. Purpose This qualitative study aims to explore nurses' experiences related to communication in the prevention and management of delirium in intensive care settings. Methods This descriptive qualitative study was conducted with nurses working in the intensive care unit of a university hospital in Türkiye. Data were collected through semi-structured individual interviews. The sample consisted of 15 nurses. To ensure the analysis of the data, the content analysis method was used. Results Findings were categorized into five themes: (1) perceptions, (2) elements of effective communication, (3) obstacles to effective communication, (4) results of effective communication, and (5) results of ineffective communication. Conclusion The results revealed that nurses perceived communication in delirium management as an important therapeutic component of nursing care. In their view, effective communication supported patient care and family cooperation. Beyond individual efforts, organizational leaders may play a crucial role in improving delirium care by allocating adequate time and resources to structured educational programs that enhance communication competencies and delirium-specific knowledge.
- MakaleYalnız künye2026Who Is at Risk? Analyzing the Drivers of Intimate Partner Violence Against Women in Turkey
Türkkan, Tuğba; Hatipoğlu, Ertuğrul; Yücel, İbrahim; Kulakaç, Nurşen; Sipahi, Ferkan; Zeybek, Halil İbrahim
Violence against women represents a severe violation of human rights and has become a pervasive issue globally. This study aims to examine the risk factors associated with violence against women in a developing country context, specifically Turkey. This study adopted a cross-sectional research design. The study sample comprised 391 women living in a northeastern Turkish province, selected using a stratified sampling method. Participants’ ages ranged from 20 to 60 years, with a mean age of 40.83 years. The findings revealed a positive correlation between the age of both women and their spouses and the likelihood of experiencing physical and verbal violence. Factors such as the number of marriages, duration of marriage, number of children, and spousal infidelity emerged as significant risks for victimization. Additionally, an early age at first marriage, the presence of mental illness, and addiction problems were identified as critical risk factors for women’s victimization in violence. Education and employment were protective factors against violence, with higher educational levels and employment status for women and their spouses reducing the risk. Regression analyses further identified women’s education level, prior exposure to domestic violence, age at first marriage, and the addiction status of the spouse as significant predictors of violence against women. The findings provide valuable insights into the etiology of violence against women. In conclusion, the study has the potential to guide the development of more targeted and effective strategies to combat this pervasive public health and human rights issue.
- MakaleYalnız künye2026Development and psychometric evaluation of the healthy internet use scale for adolescents
Özparlak, Arif; Gül, Uğur; Karakaya, Dudu; Efe, Emine
Objective The aim of this study was to develop the Healthy Internet Use Scale for Adolescents (HIUS-A) and examine its psychometric properties in order to evaluate healthy internet use (HIU) among adolescents. Methods The study was conducted according to a methodological, correlational and cross-sectional design. Data was collected between September and December 2025 at three middle schools and three high schools in the province of Antalya, Türkiye. The study used a stratified sampling method, and it was completed with 516 adolescents. The scale's content validity was examined through expert evaluation, and its construct validity was tested through exploratory and confirmatory factor analyses. The reliability of the scale was assessed using Cronbach's alpha coefficient, split-half reliability, and item-total correlations. Results The analyses revealed that HIUS-A exhibited a two-factor structure explaining 49.1% of the total variance. These factors were named “self-control” and “conscious use”. Confirmatory factor analysis findings revealed that the model showed a good level of fit (χ2/sd = 1.450; RMSEA = 0.042; SRMR = 0.039; CFI = 0.981). The internal consistency coefficient was calculated as 0.864 for the total scale, 0.855 for the “self-control” subscale, and 0.711 for the “conscious use” subscale. Conclusion HIUS-A is a valid and reliable ten-item assessment tool for evaluating healthy internet use in adolescents. Implications for practice The scale may be used by nurses and other healthcare professionals to determine HIU levels in adolescents and to evaluate the effectiveness of intervention studies relating to HIU.
- MakaleÖn baskısı açık2026Mixed Method Investigation of the Major Challenges to the Sustainable Deployment of the Electric Vehicle Charging Station Network in Türkiye
Erol, Ismail; Oztel, Ahmet; Peker, Iskender; Ar, Ilker Murat; Benli, Tolga; Turan, İsmet
Charging the increasing number of electric vehicles (EVs) in use requires the deployment of EV charging station networks (EVCSN). However, there are various challenges to deploying EVCSN in a sustainable manner. Türkiye, a developing country, should also build a robust EVCSN to encourage future adoption of EVs as the country’s market for EVs has been rapidly growing. The literature review concludes that no previous study has systematically explored challenges to the sustainable deployment of EVCSN. The goal of this study is, therefore, twofold: first, it identifies those challenges through the lenses of commonly used theories. Second, it explores them using a multi-criteria decision-making (MCDM) framework that incorporates a rough-derived interval-valued neutrosophic set (R-IVN)-based ISM into MICMAC. By deriving interval neutrosophic information from single-valued expert inputs using rough number operators, the proposed approach more accurately captures epistemic uncertainty and variability in expert judgments compared to conventional interval-based models. The method is further validated through a novel Dice–Sørensen similarity index-based simulation approach. The findings of this study suggest that developing government policies and regulations and addressing the existence of vertically integrated companies are the critical challenges with higher driving powers. These findings provide key responsibilities for stakeholders, including urban municipalities, in developing guidelines for EVCSN deployment.
- MakaleYalnız künye2026Digital cultivation of violence: a mixed-methods analysis of content and sentiment in YouTube comments on popular Turkish TV series
Olgun, Oğuzhan; Demirel, Çağatay; Demirel, Uğur
This study examines the contemporary manifestations of George Gerbner’s Cultivation Theory within the Turkish media landscape by analyzing the relationship between televised representations of violence and digital audience reception. Adopting a mixed-methods research design, the study first conducts a structured qualitative content analysis of 15 selected episodes from three popular Turkish TV series (Camdaki Kız, Sadakatsiz, and Son Yaz) to categorize and quantify various forms of violence. Subsequently, a large-scale computational emotion analysis is performed on 74,478 YouTube comments associated with these episodes using two transformer-based Turkish language models (KUBI and TREMO). The content analysis findings reveal a high prevalence of emotional and psychological violence (61.3%) across all series, followed by physical violence (29.9%), suggesting that mediated harm is increasingly represented through relational and verbal conflict. The computational analysis suggests that these narrative patterns are associated with a high-arousal and largely negative emotional environment in audience discourse, especially around anger and sadness. Notably, while traditional cultivation research emphasizes fear as a primary outcome (Mean World Syndrome), this study finds that digital reception is characterized more by outward-facing anger and moral disgust than by internalized apprehension. The results are consistent with the interpretation that the “seeds” of television cultivation continue to circulate within networked media ecologies, where televised conflict is publicly interpreted and emotionally negotiated through collective digital interaction. By bridging the gap between screen reality and platformed discourse, the research provides a comprehensive framework for understanding the long-term affective impact of Turkish television narratives in the digital age.
- MakaleYalnız künye2026A numerical case study on distinct inerter-based TMD configurations for SDOF structures under near-fault and far-fault ground motions
Araz, Onur; Abdo Saif, M.M.
This study presents a comprehensive optimization and performance evaluation of three distinct inerter-based tuned mass damper (TMD) configurations (C3, C4, and C6) for seismic vibration control. The optimal parameters for three different structural damping ratios (0%, 2%, and 5%) and a wide range of mass ratio (0 to 0.1) suitable for practical applications are determined in the frequency domain using the Sequential Quadratic Programming (SQP) algorithm to minimize the displacement response. To bridge the gap between complex optimization and practical engineering, novel empirical design formulas are proposed, enabling researchers to determine optimal parameters for C3, C4, and C6 configurations without requiring exhaustive computational effort. Unlike previous studies, the study presents a rigorous validation of inerter effectiveness through an extensive suite of 160 ground motions, providing a granular comparison of performance under near-fault excitations versus far-fault records. Results demonstrate that while inerter-based systems significantly outperform classical TMDs in the frequency domain, their comparative superiority in the time domain is more bound, with average response reduction improvements of approximately 5%. The inerter-based TMDs exhibit the highest efficiency in mitigating kinetic energy, followed by displacement and acceleration. Notably, the effectiveness of the control systems is found to be highly sensitive to ground motion characteristics and structural damping, where higher damping ratios consistently lead to reduced control performance. Considering the trade-off between seismic efficiency and mechanical simplicity, the C6 configuration is identified as the most viable solution for structural protection.
- Derleme MakaleYalnız künye2026Virtual reality as a non-pharmacological adjuvant for anxiety in oncology care: a systematic review and meta-analysis
Aydin, Aydanur; Bağcivan, Gülcan; Özkan, Aleyna
Background: Despite its growing presence in healthcare settings, research on the effectiveness of virtual reality (VR) interventions for symptom experience of patients with cancer remains varied and requires a comprehensive synthesis to reach definitive conclusions. Objective: This systematic review and meta-analysis aimed to assess the effectiveness of VR interventions in managing anxiety among individuals diagnosed with cancer. Methods: A comprehensive search of Ovid MEDLINE, PubMed, CINAHL, Web of Science, and Scopus databases was conducted for studies published from 2000 to November 2025. Publications were evaluated by independent reviewers for inclusion. The methodological quality of the included studies was assessed via Joanna Briggs Institute (JBI) critical appraisal tools for randomized controlled trials and quasi-experimental studies. Results: Twenty-one publications satisfied the requirements for review inclusion. The meta-analysis demonstrated that VR-based interventions were significantly effective in the management of patients’ anxiety, yielding a moderate-to-high effect size (SMD = −0.793, 95% CI = −1.403 to −0.184; Z = −2.551; p = 0.011). Most studies reported statistically significant decreases in anxiety scores across various cancer types, including breast, prostate, and ovarian cancers. No major side effects were reported, although minor instances of cyber sickness were managed by adjusting session durations. User satisfaction was exceptionally high, with satisfaction scores reaching 4.47/5 and 7.35/10. Implications for practice: The results support the use of VR as an effective and safe non-pharmacological intervention for anxiety management. The findings highlight the potential for VR to be integrated into routine oncology nursing and palliative care to improve the patient experience during stressful treatments like chemotherapy. Conclusion: VR-based interventions are an effective, safe, and highly acceptable approach for managing anxiety in patients with cancer. Further research is needed to support wider clinical implementation and to investigate the potential benefits of VR for other physical and psychological symptoms over longer follow-up periods. Trial registration: PROSPERO International Prospective Register of Systematic Reviews CRD42022351573.
- MakaleYalnız künye2026Monthly precipitation trends in Türkiye under complex topography and varying climate: a seasonal Mann–Kendall and innovative polygon trend framework
Şan, Murat; Nacar, Sinan; Kankal, Murat
The impacts of climate change are increasingly sensible, and Türkiye with its varied topography and diverse climate types is particularly exposed to these shifts. Understanding how precipitation patterns are evolving across its regions is therefore critical. While trend analysis is a widely used tool for this purpose, conventional approaches overlook periodicity, limiting their practical value for water resource management and irrigated agriculture. Therefore, this study aims to examine seasonal trends in long-term (1969–2020) monthly total precipitation in Türkiye, in which each calendar month is treated as a separate season in the sense of seasonal trend-analysis terminology, accounting for altitude, slope, geographical region, and Köppen climate classification. For this purpose, the seasonal Mann-Kendall (SMK) test and the innovative polygon trend Wilcoxon significance test (IPWST), a relatively new graphical method, were used, and the two approaches were comparatively evaluated. According to the study’s results, the rate of increase in coastal areas, specifically the Aegean and Black Seas, exceeds the rate of decrease. In contrast, the reverse is observed in inland and eastern regions. The IPTWST method indicates a more pronounced increasing trend in the Marmara and Mediterranean regions. Furthermore, although analogous trends are observed at lower slopes and altitudes, analyses indicate that these trends are more strongly related to altitude, with the rate of increase decreasing as altitude increases. The IPTWST identified significant or weak trend signals at a larger number of stations than the SMK, particularly in relation to altitude. Nationwide, the two methods revealed significant increases of 7% and decreases of 6%, respectively; this pattern was supported by statistical tests, reflecting the variability of regional climates and the influence of topographic factors on trend analysis.
- MakaleYalnız künye2026First molecular data based on the mitochondrial 16S rRNA gene for the endemic harvestman Mediostoma izmiricum Snegovaya, Kurt and Yağmur (Opiliones: Nemastomatidae) from Türkiye, with insights into the phylogenetic relationships of the genus
Kurt, Pınar
Mediostoma izmiricum Snegovaya, Kurt and Yağmur, is a species of the family Nemastomatidae Simon, and is endemic to Türkiye. To date, there is no molecular data available for the 16S rRNA gene region for this species or its genus, which limits our knowledge of its phylogenetic position. The 16S rRNA gene region of this species was analysed for the first time, yielding a sequence length of 465 bp. Bayesian inference (BI) and maximum likelihood (ML) phylogenetic trees were subsequently constructed based on these data, revealing the phylogenetic position of both the species and its genus.
- Kitap BölümüYalnız künye2026Sustainability and Environmental Management in Aviation: The Role of Green Approaches
Yalvaç, Güler
The aviation sector holds a strategic position due to its contributions to global economic growth and transport infrastructure, but it is also the subject of intense debate in the context of sustainability due to its environmental impact. This study was conducted to examine the role of green approaches and environmental management in aviation management. Strategies for reducing carbon emissions, energy efficiency, waste management and renewable energy use are particularly emphasised. The study highlights that the adoption of sustainable practices by airlines and airport management is critical not only for environmental benefits but also for corporate reputation, competitive advantage and customer satisfaction. The feasibility of implementing green approaches as a strategic management model in aviation is discussed, and an exemplary model is proposed. At the same time, the necessity of an environmentally friendly transformation in the sector is emphasised.
- MakaleYalnız künye2026Assessment of gamma-ray attenuation properties in advanced ceramics incorporating colemanite, pyrophyllite, and plastic clay
Uysal, Turan; Kaya, Selim
This study investigates the gamma-ray and neutron shielding performance of advanced ceramic composites containing colemanite, pyrophyllite, and plastic clay as environmentally friendly alternatives to conventional lead-based shielding materials. Gamma-ray attenuation properties were evaluated over the energy range of 59.54–2000 keV using theoretical calculations from WinXCOM and Monte Carlo simulations performed with the EGS4 code. Excellent agreement between the two methods confirmed the reliability of the simulation results. The mass attenuation coefficient (μ/ρ) decreased with increasing photon energy due to the transition from photoelectric absorption to Compton scattering and pair production mechanisms. Correspondingly, the half-value layer (HVL) and mean free path (MFP) increased, while radiation protection efficiency (RPE) decreased with photon energy. The effective atomic number (Zeff) exhibited an energy-dependent decline, reflecting changes in dominant photon–matter interaction processes. Neutron shielding performance improved with increasing colemanite content owing to the presence of boron-rich phases, and Sample-5 exhibited the highest fast neutron removal cross-section (ΣR = 0.11062 cm−1). The same sample also showed the highest gamma-ray kerma coefficients, indicating enhanced energy absorption capability. Overall, the results demonstrate that colemanite-enriched ceramic composites provide effective combined gamma-ray and neutron shielding and represent promising, sustainable, and non-toxic alternatives for radiation protection applications.
- MakaleYalnız künye2026Mineralogical and geochemical controls on Co-V-Pt-Ni enrichment in manganese mineralization: evidence from the Dilli deposit, Eastern Türkiye
Gücer, Mehmet Ali; Çimen, Okay; Aktağ, Alican; Keskin, Serdar
The growing demand for critical minerals driven by the global energy transition and advanced technologies highlights the importance of unconventional metal reservoirs. This study investigates the Ni-, Co-, V-, and Pt-enriched Dilli manganese deposit (Kemaliye-Erzincan, Eastern Türkiye) to constrain the mineralogical, geochemical, and genetic controls on critical metal enrichment in Mn oxide mineralization. An integrated approach combining field observations, petrography, X-ray diffraction (XRD), whole-rock geochemistry, mineral chemistry, and stable C-O isotope analysis was applied to better understand the potential origin of critical mineral enrichments. The mineralization is dominated by Mn4+-bearing oxides, principally pyrolusite and hollandite, accompanied by minor rhodochrosite. High MnO (39-64 wt%) and very low Al2O3 and Fe2O3 contents indicate chemical precipitation with negligible detrital input. Discrimination diagrams and trace-element systematics consistently support a structurally controlled hydrothermal origin. Chondrite-normalized REE patterns display low total REE and very low Nd contents comparable to typical hydrothermal deposits, whereas neutral to slightly positive Ce anomalies and non-chondritic Y/Ho ratios suggest limited oxidative interaction with surface-derived fluids rather than primary marine hydrogenetic growth. Stable C–O isotope compositions of co-genetic calcite are inconsistent with a purely marine depositional environment and indicate precipitation from low-to moderate-temperature hydrothermal fluids. Mineral chemistry reveals strong phase-specific partitioning: hollandite preferentially incorporates V and Ba, whereas pyrolusite is enriched in Ni. Cobalt occurs in both phases, whereas Pt may also be present in both Mn oxide phases, suggesting that trace-element distribution is influenced by both crystallochemical and physicochemical controls. The enrichment of Ni, Co, and Pt is most plausibly linked to hydrothermal fluid circulation through ultramafic units, which likely acted as the primary metal source prior to precipitation. The Dilli deposit thus represents a structurally controlled hydrothermal Mn system enriched in critical metals, emphasizing the exploration relevance of Mn oxide mineral chemistry in identifying alternative sources of critical metals in Türkiye.
- MakaleYalnız künye2026Tourism in a Warming World: Climate Change and Inbound Expenditure in Leading Tourism Economies
Kömürcüoğlu, Ömer Faruk; Kömürcüoğlu, Elif Duygu; Hayaloğlu, Pınar
Climate change is a global risk reshaping tourism through destination attractiveness, service continuity, and travel risk perception. Yet tourism research has largely focused on traditional determinants such as income, price competition, and global integration, while multidimensional evidence on climate impacts remains limited. This study examines the link between climate change and tourism inbound expenditure in 12 leading tourism economies over 2004–2019. Climate change is measured using a PCA-based index combining per capita CO2 emissions with temperature and precipitation volatility. This approach captures both average climate conditions and fluctuations in the climate regime. MMQR is employed to account for heterogeneous effects, with economic size, exchange rate, and globalization included as controls. Results show that increases in the climate change index significantly reduce tourism inbound expenditure. Robustness is confirmed by PCSE and FGLS estimators, while causal linkages are assessed using the HPJ test. By showing that multidimensional climate pressure constrains the expenditure performance of major tourism economies, the study extends the application of destination resilience theory to a macroeconomic setting. It also highlights the need to integrate climate adaptation, resilient infrastructure, and ecosystem protection into sustainable tourism planning.