Yayınlar
Koleksiyondaki öğeler
- MakaleAçık Erişim2025Scopus SJRQ1Investigation of the relationship between attitudes toward migration and life satisfaction of nurses working in Turkey
Tuncer, Metin; Tuncer, Gülsüm Zekiye; Turan, Şeyma; Khorshtd, Leyla
Background: Nurse migration contributes to the nursing shortage in developing countries. Understanding nurses' attitudes toward migration and related factors is crucial for policy-making and healthcare workforce planning in Turkey. Aim: This study aimed to investigate the relationship between nurses' attitudes toward migration and their life satisfaction in Turkey. Methods: The study included working nurses with social media accounts on a social media platform in Turkey who followed nursing-related content. A sample of 423 nurses completed an online survey. Independent variables included nurses' sociodemographic characteristics and inclination toward migration, while dependent variables were life satisfaction and migration attitude levels. Data were collected via an online questionnaire, incorporating the Brain Drain Attitude Scale (BDAS) and Life Satisfaction Scale (LSS), between April and May 2023. Results: The study found a negative correlation between nurses' life satisfaction levels and their attitudes toward migration (r = −.349, p <.001). Nurses dissatisfied with their profession (F = 6.575, p <.05), lacking professional support (F = 8.641, p <.05), and lacking social support (F = 6.307, p <.05) scored higher on the BDAS. Conversely, those satisfied with their profession (F = 31.455, p <.05), receiving professional support (F = 26.307, p <.05), and social support (F = 33.990, p <.05) scored higher on the LSS. Conclusion and implications for nursing: The study revealed that decreased life satisfaction among nurses in Turkey correlates with increased migration attitudes. These results underscore the need for strategies to enhance nurses' job satisfaction and support systems to mitigate migration tendencies. This study contributes valuable insights into the high inclination of Turkish nurses toward emigration.
AtıfScopus4WoS4OpenAlex4
İncele - MakaleAçık Erişim2025Scopus SJRQ2Comparison of different animal milks on microbiological, physicochemical, sensory properties, and volatile component profile of Kefir
Meral-Aktaş, Hacer; Ürkek, Bayram; Aktaş, Haktan; Baltacı, Cemalettin; Çetin, Bülent; Şengül, Mustafa
In this study, the effects of cow, buffalo, ewe, and goat milk on the microbiological, physicochemical, sensory properties, and volatile component profile of kefir were examined during storage. Key microbial counts, including lactic cocci, lactic bacilli, and yeast, varied among kefirs, with lactic bacilli and lactic cocci decreasing over time, while yeast counts increased. The titratable acidity ranged from 1.12 to 1.16%, and pH values varied between 4.51 and 4.83. Sensory analysis showed that cow milk kefir received the highest consumer appreciation, while goat milk kefir was least favored. Notably, ewe milk kefir contained the highest benzoic acid content. Principal component analysis identified distinct clusters in the volatile profiles of the kefirs. Our results suggest that buffalo and ewe milk kefirs may be viable alternatives to cow milk kefir, with potential for consumer acceptance based on sensory properties.
AtıfScopus5WoS6OpenAlex7İncele - MakaleAçık Erişim2025Scopus SJRQ1Secondary Traumatic Stress and Coping Experiences in Psychiatric Nurses Caring for Trauma Victims: A Phenomenological Study
Gülirmak Güler, Kübra; Uzun, Sevda; Emirza, Elif Güzide
Aim: In this study, it was aimed to evaluate the secondary traumatic stress and coping experiences of psychiatric nurses who care for people who have experienced psychological trauma with a phenomenological approach. Materials and Methods: In this study, semi-structured in-depth interviews were conducted with 18 psychiatric nurses residing in Turkey using the phenomenological research method. The criterion sampling method was used to reach the sample group. Interviews continued until data saturation was achieved, and all interviews were audio-recorded and then transcribed. The data were analysed using thematic analysis. The study was conducted and reported using the COREQ checklist. Findings: In the analysis of the data, three themes (difficulties in caring for people who have experienced trauma, the effects of caring for people who have experienced trauma on the individual and coping, reflections of secondary trauma on the profession) and seven sub-themes (mental, physical, social, psychosocial difficulties and coping, quality of care, professional and organisational aspects) were identified. Conclusion: As a result of the study, it was determined that secondary traumatic stress was observed in psychiatric nurses caring for individuals who experienced psychological trauma. It was determined that caring for people who have experienced psychological trauma can negatively affect nurses psychosocially, and individuals have difficulty coping. In line with the results of the study, it is thought that necessary intervention programs should be created for nurses experiencing secondary traumatic stress.
AtıfScopus13WoS13OpenAlex14İncele - MakaleAçık Erişim2025Scopus SJRQ1The Memory Destruction and Reconstruction Games within the Scope of Persianization Politics in Iran
Dinç, Artum
This research examines how collective memory management has influenced the images, symbols, historical artifacts, names, and language of Turkish culture in Iran since 1925 and how Turks for anti-discrimination have responded. This study employed a qualitative research model, with data collected through a relevant literature review and interviews. The sample was selected from Turks who have expressed reactions to the Persianization process. The findings were obtained through open and axial coding of the collected data and an inductive inquiry strategy. The findings revealed that, in line with the assimilation (Persianization) policies implemented in Iran, historiography and memory management practices based on Persian nationalism have been perpetuated against Turkish identity and its collective memory. This process is carried out by erasure, forgetting, amnesia, annulment, obsoletion, abandoning, humiliating, and banning symbolic representations, historical artifacts, names, and the language belonging to Turkish culture. The findings also demonstrated that Turks have not remained passive in the face of these practices but have actively sought to commemorate and preserve their language, names, historical events, artifacts, and heroes through artistic events, ceremonies, sports competitions, new media, legal channels and protests. From the selective coding of the findings, it can be concluded that the management of collective memory based on essentialist, monist, exclusionary and supremacist Persian nationalism are nowadays being questioned and debated in intellectual discussion, political competition and everyday life scenes. It can be concluded that the attitude of the political authority is not towards recognizing ethnonational diversity and their rights in Iran, but towards maintaining uncertainty.
- MakaleAçık Erişim2025Scopus SJRQ1The Effect of Music on Fear and Anxiety of Children During Tomography: A Randomized Controlled Double-Blind Study
Kurudirek, Fatma; Demir Barbak, Zülbiye; Demir İmamoğlu, Zeynep; Çiftci, Kamile; Delice, Orhan
Aim: This study was conducted to determine the effect of a musical intervention during computed tomography (CT) on fear, anxiety and vital signs of children. Method: This randomized, double-blind controlled trial was conducted according to the Consolidated Standards of Reporting Studies (CONSORT) guidelines. The study sample included children aged between 6 and 10 years who met the inclusion criteria and underwent CT scan in the emergency department of a public hospital in eastern Turkey between 18 April and 20 May 2023. The research was completed with a total of 60 children, randomized to one of two groups. The nursing intervention of the study was playing music. Data were collected through face-to-face interviews using the Child and Family Information Form, the Children's Fear Scale (CFS), Children's Anxiety Meter-State (CAM-S) and the Vital Signs Monitoring Form (pulse, blood pressure and oxygen saturation). Ethical principles were followed in the research. Results: The level of fear, anxiety, pulse rate and respiratory rate of the children in the musical intervention group during CT scanning were lower than in the control group (p < 0.05). No difference was found between the groups in terms of oxygen saturation (p < 0.05). Conclusion and Recommendations for Implementation: The results of this study suggest that musical intervention during CT scanning in children is effective in reducing the level of fear and anxiety and stabilizing vital signs. By using such nonpharmacologic methods, nurses can provide support to children and alleviate emotional difficulties during procedures. Trial Registration: NCT06086509. Summary: What is already known about this topic? Music therapy is recognized as an effective nonpharmacologic intervention to reduce fear and anxiety in paediatric patients undergoing medical procedures. Previous studies have shown that musical intervention during CT scans can calm children, potentially reducing the need for sedation and improving compliance. Knowledge gaps remain regarding the specific effects of music on physiological parameters like pulse and respiratory rates during paediatric CT scans. What this paper adds? This study demonstrates that musical intervention during CT scans significantly reduces fear and anxiety levels in children aged 6–10 years. The research findings show that music intervention can also stabilize vital signs, such as pulse and respiratory rates, during CT scans, suggesting a relaxed physiological state. The results support the idea that incorporating music into paediatric imaging procedures can enhance patient comfort and improve the quality of the imaging process by encouraging children to remain still. The implications of this paper: Incorporating music therapy into routine paediatric imaging procedures can reduce anxiety, improve patient cooperation and potentially reduce the need for sedatives. Future research could explore the optimal types of music, volume levels and delivery methods to maximize the calming effects on children during various medical procedures. Training programs for paediatric healthcare providers can include education on the benefits of nonpharmacologic interventions, like music therapy, to reduce anxiety and improve patient outcomes in clinical settings.
AtıfScopus3WoS2OpenAlex3İncele - MakaleYayıncıda açık erişim2024Scopus SJRQ1Gyroscopic precession control for maneuvering two-wheeled robot recoil stabilization
Çetin, Gökhan; Ünker, Faruk
A two-wheeled robot has high maneuverability and can spin around with a high velocity but is prone to roll over under a recoil force. Because the wheels are only used to control the maneuver speed of the robot. However, a two-wheeled robot using a gyroscope does not need the control of the wheels and can maintain the stability of the robot under a recoil force during maneuvers even if the gimbal of the gyroscope is not controlled by a torque. In this study, the equations of motion of the gyroscopic robot are derived via Lagrangian equations, and the balancing performance of the uncontrolled gyroscope is simulated via Matlab to determine a desired configuration for mechatronics system design. Then, a linear-quadratic regulator (LQR) is implemented to the chosen control moment gyroscope (CMG) configuration and compared in simulations of RecurDyn. LQR controller was used to prevent oscillating motions of double CMGs under the recoil force of a weapon. The simulation results showed that the gyroscopic two-wheeled robot is improved using an LQR controller and powerfully balanced in static with excellent performance.
AtıfScopus3WoS2OpenAlex2İncele - MakaleAçık Erişim2024Scopus SJRQ1Characterization of cellulose produced by bacteria isolated from different vinegars
Güzel, Melih
Traditional vinegars are naturally produced from sugar- or starch-containing raw materials, through alcoholic fermentation followed by acetic fermentation. Fermentation is a spontaneous and complex process involving interactions between various microorganisms. In this study, we produced vinegar using traditional methods from six fruits: rosehip, pear, fig, wild pear, apple, and plum. Bacteria that produce bacterial cellulose (BC) were isolated from these vinegars and identified. In addition, we investigated the properties of BC produced from these bacteria. The strains isolated from vinegars were identified as Gluconobacter oxydans strain MG2022, Acetobacter tropicalis strain MG2022, Acetobacter fabarum strain MG2022, Komagataeibacter saccharivorans strain MG2022, K. saccharivorans strain EG2022, and Acetobacter lovaniensis strain OD2022. In total, 0.83–2.04 g/L BC was produced and the bacterial strain isolated from pear vinegar yielded the most BC. BC produced by the bacterial strain isolated from wild pear vinegar had the highest thermal stability and crystallinity (87.44 %). Overall, this study shows that different fruits contain different BC-producing bacteria in their natural flora and vinegars obtained from fruits can be used in BC production. Also, different BC-producing bacteria can be isolated from different vinegars, and BC produced by these bacteria might have different properties.
AtıfScopus7WoS4OpenAlex7İncele - MakaleAçık Erişim2024Scopus SJRQ2Production and Enrichment of Erucic Acid Methyl Ester Analytical Standards from Natural Oils for Food Control Analysis
Karabaş, Yağmur; Gül, Abdulkadir; Karpuz, Ömer; Akdoğan, Arda; Baltacı, Cemalettin
Foods high in erucic acid (EA), a fatty acid considered a natural toxin, can pose various health risks. Studies have reported that people exposed to high levels of EA are more likely to experience cardiovascular disease, are susceptible to myocardial adiposity, and have increased rates of diabetes. Therefore, in 2019, the European Commission (EC) declared that the maximum EA content in vegetable oils should be no more than 2%. These regulations require EA analysis in import and export food samples. A methyl ester of EA (EAME) standard is required to analyze EA content. In many countries, this analytical standard is not available and is being imported. This study endeavored to economically produce the EAME standard, which is in high demand due to mandated analysis, using natural oils. Initially, the fatty acid amounts in the food samples were analyzed by the gas chromatography–mass spectrometry/flame ionization detection (GC-MS/FID) method. The analyses revealed that mustard seed oil had the lowest EA content, while yellow mustard seed oil had the maximum EA content. The esterification was conducted on the samples containing both high and low EA, resulting in an efficiency of approximately 80%. The crystallization process was subsequently repeated to increase the EA quantity until the highest EAME content was obtained. By this process, 14 different concentrations of EAME ranging from 2.33 to 55.66% were produced. These results demonstrate the first successful production of EAME standards from natural oils that can be used in validation and internal quality control studies for food control analysis.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2025Scopus SJRQ2Effect of sodium pentaborate (B5H10NaO13) nanoparticle addition to oxide coatings grown on AZ31 magnesium alloy by micro arc oxidation method on mechanical, corrosion and adhesion properties of coatings; [Efecto de la adición de nanopartículas de pentaborato de sodio (B5H10NaO13) en los recubrimientos de óxido formados sobre la aleación de magnesio AZ31 mediante el método de Microoxidación por Arco, sobre las propiedades mecánicas, de corrosión y de adhesión de los recubrimientos]
Sukuroglu, Suleyman
AZ31 magnesium alloy is one of the lightweight metallic engineering materials that are widely used in many industrial areas such as aviation, space, automobile and electronics industries, biomedical applications, where structural weight reduction is at the forefront of design principles. This study focuses on the growth of MgO and MgO:B5H10NaO13 doped oxide coatings on the surface of AZ31 magnesium alloy by micro arc oxidation (MAO) method in order to improve its usage areas and lifetime in industrial applications, and to investigate the structural, morphological, adhesion and corrosion properties of the grown coatings. In the study, MgO coatings were grown by MAO method and MgO:B5H10NaO13 doped composite oxide coatings were grown by adding sodium pentaborate (B5H10NaO13) nanoparticles into the electrolytic solution in MAO method. The phase structure of the grown coatings was determined by X-ray Diffraction (XRD), microstructure by Scanning Electron Microscopy (SEM) and chemical composition by Energy Dispersive X-ray Spectroscopy (EDS). The hardness of MgO and MgO:B5H10NaO13 doped composite oxide coatings were determined by microhardness tester, the adhesion resistance with the base material was determined by Scratch Tester and the corrosion resistance was determined by potentiodynamic polarization tester. As a result, it was observed that dense and homogeneous coatings were grown on the surfaces of particle-added (MgO:B5H10NaO13) coatings, that porosity and pore sizes on the surfaces of the coatings were reduced, that microcracks were reduced, and that coatings with high bond strength with the base material were grown. It was also determined that the corrosion resistance of the coatings with particle addition (MgO:B5H10NaO13) was higher than the corrosion resistance of the coatings without particle addition (MgO).
AtıfScopus1OpenAlex1İncele - MakaleAçık Erişim2024Scopus SJRQ1Determination of fatty acid, cholesterol, alpha-tocopherol, and aroma components of traditionally and commercially produced Trabzon butters
Gündoğdu, Engin; Beşer, Musa
This study investigated 29 butter samples from Trabzon, Turkey. Cholesterol contents ranged from 134.13 to 325 mg/100 g, α-tocopherol contents ranged from 1.62 to 3.37 mg/100 g, and β-carotene contents ranged from 4.46 to 15.60 μg/g. Fatty acid composition analysis showed variations, with palmitic acid ranging from 26.11 % to 44.25 %, oleic acid from 19.55 % to 29.80 %, and linoleic acid from 1.63 % to 3.04 %. A total of 44 aroma components were identified. Traditional butter samples exhibited differences in aroma components and fatty acid composition compared to commercial butter. Notably, traditional butter had higher concentrations of octanoic and n-decanoic acids than commercial butter. Moreover, some aroma components such as N-butanoic acid 2-ethylhexyl ester, decanoic acid, and pentadecane were found exclusively in traditional butters. Traditional butter showed higher α-tocopherol and β-carotene contents. These findings underscore the distinct chemical profiles of traditional and commercial butter samples, influenced by production methods and possibly geographical origin.
AtıfScopus1OpenAlex4İncele - MakaleYalnız künye2025Scopus SJRQ3Cultural and Institutional Dimensions of Belarus–Iran Relations
Dinç, Artum
This article examines the cultural and institutional dimensions of Belarus–Iran relations from the 1990s to the present through a cultural sociology perspective. It explores how social institutions—including family, education, science and technology, media, diplomacy, religion, and economic frameworks—have shaped and been shaped by this bilateral relationship. The research situates Belarus–Iran ties within frameworks of cultural diplomacy, soft power, and constructivist international relations. The findings indicate that shared values (for example, traditional family norms and sovereignty), mutual educational and scientific exchanges, coordinated media narratives, religious and cultural interactions, and sanctions-driven economic collaboration have together fostered a unique cross-cultural partnership. The analysis highlights how cultural diplomacy and institutional cooperation underpin the alliance, offering insights into how two sanctioned, ideologically aligned states leverage culture and institutions to reinforce their strategic partnership.
- MakaleAçık Erişim2025Scopus SJRQ2Internal Medicine Nurses’ Perceptions of Work Environment Ergonomics and Safety Climate
Aktepe Coşar, Dilan; Demirağ, Hatice
Objective: This study aimed to examine the relationship between the ergonomic conditions of the work environment and the perception of safety climate among internal medicine nurses. Materials and Methods: This descriptive study was conducted between October 30, 2023, and January 30, 2024, with a total of 440 internal medicine nurses in Turkey using the “snowball sampling” method. Data were collected using the “Personal Information Form,” the “Workplace Ergonomics Scale for Nurses,” and the “Safety Climate Scale.”. Results: A statistically significant difference was found in the mean scores of the “Workplace Ergonomics Scale for Nurses” based on marital status, educational level, perceived workload, and whether the nurses had received occupational safety training (p < 0.05). However, no significant difference was observed in the scale scores based on gender, professional experience, or satisfaction with the work environment (p > 0.05). A significant difference was also identified in the mean scores of the “Safety Climate Scale” according to gender, educational level, professional experience, satisfaction with the work environment, and occupational safety training status (p < 0.05). A significant negative correlation was found between the scores of the “Workplace Ergonomics Scale for Nurses” and its subdimensions and the safety training subdimension scores. Data were analyzed using t-test, ANOVA, and correlation analysis. Conclusion: In conclusion, improving ergonomic conditions, strengthening managerial support, establishing effective safety communication, and promoting continuous education are recommended as key strategies to ensure that nurses work in a safe and supportive environment. Additionally, implementing tailored interventions based on demographic and professional characteristics may contribute to the development of a safety culture in nursing and the improvement of patient care quality.
AtıfOpenAlex1İncele - MakaleAçık Erişim2025Scopus SJRQ1Gender Analysis in the Islamic Law-Based Ecofeminism Movement for Ecosystem Protection
Malik, Ihyani; Karimullah, Suud Sarim; Okur, Hüseyin; Rahman
The ecological crisis reflects the failure of ethical relations between humans, nature, and power structures, thus demanding a review of the paradigm of domination that underlies these relations. This study analyzed how the principles of Islamic law can be integrated with the ideas of ecofeminism to create more inclusive and sustainable environmental policies. The study used an intersectional approach with comprehensive literature analysis and gender analysis frameworks to understand how social identity affects women's participation in ecofeminism and environmental protection based on Islamic law principles. The results of the study state that the integration of the principles of ecofeminism and Islamic law has excellent potential to create fair and sustainable environmental policies based on justice (‘adl), balance (mizan), and responsibility (khalifah). The concept of khalifah affirms the role of humans as custodians of the earth, provides a theological reason to support environmental conservation and inspires collective responsibility, including the role of women as essential agents. Programs that give women access to land and natural resources increase their participation in agriculture and environmental management, reduce poverty, and strengthen their role as agents of change. However, challenges such as resistance from patriarchal communities, lack of financial and technical support, and the need for ongoing education and training must be overcome. Technology also plays a crucial role in supporting inclusive and sustainable environmental policies.
AtıfScopus9İncele - MakaleAçık Erişim2024Scopus SJRQ2Determining the health-seeking behaviors of people with epilepsy
Bingöl, Nuray; İşcan Ayyildiz, Neşe; Aktepe Coşar, Dilan
Purpose: Health-seeking behaviors of individuals who have epilepsy might affect the treatment of the disease, recovery process, and self-care activities. The present study was conducted to determine the health-seeking behaviors of individuals who have epilepsy. Materials and methods: The present study was conducted in a descriptive and cross-sectional design with 190 epilepsy patients who applied to the Neurology Clinic in the north and east of Turkey between April 2023 and January 2024. The data of the study were collected by using the Introductory Data Form, Health-Seeking Behavior Scale (HSBS). The IBM SPSS 27 software, variance analysis, Tamhane T2, ANOVA Test, Tukey Test, and Multiple Regression Analysis were used to evaluate the study data. Results: The mean score of the online health-seeking behavior sub-dimension of the Health-Seeking Behavior Scale of the individuals who had epilepsy was found to be 13.32 ± 5.40, the mean score of the professional health-seeking behavior sub-dimension was 9.92 ± 2.75, and the mean score of the traditional health-seeking behavior sub-dimension was 8.46 ± 3.29. No significant differences were detected between individuals’ sex, seizure types, and health-seeking behaviors, and a significant difference was detected between marital status, educational status, place of residence, occupation, income level, seizure frequency, and medication use status and health-seeking behaviors (p < 0.05). According to the multiple linear regression analysis that was used to examine the effects of sociodemographic characteristics of individuals with epilepsy on health seeking behavior scale scores, it was found that sociodemographic characteristics such as educational status, place of residence, marital status, and age significantly affected online, professional, and traditional health seeking behavior scores. Conclusion: In conclusion, it was found in the present study that the online health-seeking behavior of the individuals who had epilepsy was higher than other health-seeking behaviors. The health-seeking behaviors of patients were affected by sociodemographic characteristics (e.g., marital status, educational status, place of residence, occupation, income level, seizure frequency, and medication use). It is of great importance to conduct larger future studies on individuals who have epilepsy and are seeking traditional treatment for epileptic seizures because the sources from which health information is obtained might affect the diagnosis, treatment, and recovery processes.
AtıfScopus4WoS5OpenAlex5İncele - MakaleYalnız künye2008Scopus SJRQ1Frequency optimization of laminated composite angle-ply plates with circular hole
Topal, U.; Uzman, Ü.
The fundamental frequencies of simply supported symmetrically laminated composite angle-ply plates with central circular holes with a given material system are maximized with respect to fibre orientations. The first-order shear deformation (FSDT) theory is used for finite element analysis. Modified feasible direction (MFD) method is used for the optimization routine. Also, the optimum fibre orientations are obtained using golden section (GS) method to compare with MFD method. Finally, the significant effects of different number of layers, boundary conditions, plate aspect ratios, hole diameter-to-width ratio, material anisotropy and antisymmetric lay-up on the results are demonstrated.
AtıfScopus26OpenAlex22İncele - Kitap BölümüYalnız künye2025Human-machine collaboration: How do employees interact with artificial intelligence?
Şimşek, Tuğçe
This chapter examines the conceptual framework of artificial intelligence (AI) systems in the organisational context in terms of human-machine collaboration in three dimensions: supportive, collaborative, and autonomous AI models. A literature review integrates theoretical approaches on employee perceptions, acceptance and resistance processes, and the role of organisational culture in adaptation, establishing connections between performance, motivation, and psychosocial effects. Ethical dimensions are evaluated in the context of autonomy, privacy, and fairness, and the potential consequences of AI on work-life balance and role ambiguity are revealed. The findings point to a lack of empirical research despite conceptual richness and suggest the development of measurement tools with both descriptive and experimental designs. The chapter provides a roadmap for future applied research while emphasising the importance of clarifying strategic decision-making processes related to AI adaptation in an organisational context.
AtıfScopus2OpenAlex2İncele - MakaleYalnız künye2008Scopus SJRQ1Laboratory study of expanded polystyrene (EPS) geofoam used with expansive soils
Ikizler, S. Banu; Aytekin, Mustafa; Nas, Evin
The reduction of transmitted lateral swelling pressures on retaining structures constructed in expansive soils is investigated. Swelling pressures will develop if the soil is not allowed to swell freely. The magnitude of swelling pressure depends on the degree of expansion permitted. When a little soil expansion is allowed, the swelling pressure may be decreased considerably relative to the case of no expansion. This study examines the role of expanded polystyrene (EPS) geofoam in accommodating soil expansion and hence reducing swelling pressures on adjacent structures. Several hypothetical cases are presented whereby reductions on the transmitted lateral pressures due to expansive soils are examined for different thickness of EPS geofoam.
AtıfScopus94OpenAlex97İncele - MakaleYalnız künye2025Scopus SJRQ1Durability properties of fiber-reinforced geopolymer concrete with natural and industrial waste mineral admixtures
Aksüt, Yavuz Selim; Çullu, Mustafa; Yetgin, Şükrü
In this study, ground granulated blast furnace slag (GGBFS) and quarry rock dust (RD), both industrial and natural mineral wastes were used as binder materials in geopolymer concrete. The influence of these mineral admixtures on the concrete’s durability under aggressive environmental conditions was investigated. Steel, polyester, and hybrid fibers were incorporated at volume fractions of 0%, 0.25%, 0.50%, 0.75%, and 1.0% to further enhance durability performance. Freeze-thaw and sulfate resistance tests were carried out to evaluate the effects of fiber type and content on the durability behavior of the geopolymer concrete. The test results showed that the mineral waste-based binder system itself offered considerable durability while the addition of fibers significantly improved resistance to freeze-thaw cycles and sulfate attacks. Among all types, the geopolymer concrete with 0.5% polyester fiber exhibited the highest resistance to freeze-thaw while hybrid fiber usage provided a balanced enhancement across both test environments.
AtıfScopus1WoS1İncele - MakaleYalnız künye2024Scopus SJRQ2Edge detection and depth estimation of Lake Sapanca, Eastern Marmara Region, from high-resolution magnetic data
Aktaş, Gülten
The present study aims to determine submarine structural elements by analysing high-resolution magnetic data sets and to examine the impact of geological surface structures characterizing Lake Sapanca. Lake Sapanca is located on the northern branch of the North Anatolian Fault Zone. The study area and its immediate surroundings are located within the most active tectonic structure of Turkey. A magnetic study was carried out in Sapanca Lake to reveal the structural elements that caused the formation of the lake. Diurnal corrections were applied to the magnetic data. During the analysis of the marine magnetic data set, there are variations in the mean field level of the magnetic field caused by the routing effects of ship noise on the measurements. To eliminate this noise effect, directional correction was performed. Then, de-stripping correction was also applied. It is essential to estimate the boundaries and depths of the structural features of the region. In order to elucidate the structural features of the region, different techniques such as tilt angle derivative, the total horizontal derivative of tilt angle derivative, Euler 2D deconvolution, horizontal gradient magnitude, and source edge detection were applied to magnetic data. 2-D modelling using GM-SYS in Oasis Montaj were performed. These techniques identified and mapped the edges of anomalous sources related to magnetic data corresponding to geological elements in the study area. The results allow us to image the submarine lineaments for the survey area. These structural lineaments are in E–W, NE–SW and NW–SE trends. These lineaments in our results are quite compatible with the faults in previous geophysical results. The E–W trending lineaments are related to the E–W trending faults in the region.
AtıfScopus3WoS2OpenAlex3İncele - MakaleAçık Erişim2024Scopus SJRQ2Bioethanol Production from Mulberry Molasses Waste with Ohmic-Assisted Hydrodistillation
Tunç, Merve Tuğçe; Genç, Berna; Karataş, Şeyda Merve
In this study, the fermentation process of bioethanol production conditions were optimized by response surface methodology. Mulberry molasses production waste was used as the only carbon source for yeast fermentation to produce bioethanol. Hydrodistillation (HD) and ohmic-assisted hydrodistillation (OAHD) methods were employed to concentrate the bioethanol. Fermentation time (48–168 h), waste matter rate (5–45%) and pH (5–7) were selected as independent variables. Alcohol concentration was treated as the response. Optimum fermentation conditions were determined as 96.894 h fermentation time, 45% waste ratio and pH 7. At these optimum conditions, alcohol concentration was determined as 3.77 ± 0.33%. While the distillate obtained in the HD method contained 22.50 ± 1.89% alcohol, it showed 27.72 ± 0.24% in the OAHD method. The energy consumption values for OAHD and HD was 2.92 ± 0.51 and 53.24 ± 1.74 Wh/mL bioethanol, respectively. Results of study showed that the OAHD could be a cost-effective and green method to distillation of bioethanol from mulberry molasses waste.
AtıfScopus3WoS1OpenAlex3İncele
