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Koleksiyondaki öğeler
- MakaleAçık Erişim2026Scopus SJRQ2Enhancing salt stress tolerance in sugar beet via TiO2 nanoparticles: a machine learning approach
Engin, Mustafa Alptekin; Sefaoglu, Firat; Gul, Volkan; Aras, Selim; Kaynar, Dilara
In this study, the biostimulant potential of titanium dioxide (TiO2) nanoparticles was investigated to enhance sugar beet (Beta vulgaris L.) seed response to salt stress. Controlled applications were conducted at different NaCl (0–200 mM) and TiO2 (0–1,800 ppm) levels, and eight key morphological and physiological parameters were evaluated. In the first stage, the individual and interactive effects of the factors were examined using a two-way analysis of variance. Then, various machine learning-based regression models, primarily the Gradient Boosting algorithm, were used to numerically model plant responses. Based on the high-accuracy models, optimal application combinations were determined for each parameter and visualized using graphical surface analyses. Additionally, the most suitable overall TiO2 dosage for each salt level was calculated using a multi-criteria scoring system that assigned equal weight to all parameters. The results revealed that TiO2 exerts a regulatory and protective effect on plants against salt stress, with this effect varying with both dosage level and environmental stress severity. The study demonstrates that nanotechnological initiatives can be integrated into data-driven agricultural strategies to optimize stress management.
AtıfScopus1WoS1OpenAlex1
İncele - MakaleAçık Erişim2026Scopus SJRQ4Experience-Based Decentralized Marketing and Advertising (Ex-Mad): A Blockchain Framework for Transparent and Fair Digital Campaigns
Ayberkin, Doruk; Özen, Üstün
The contemporary digital advertising ecosystem faces critical technical and operational challenges, primarily driven by centralized intermediaries, data opacity, and privacy vulnerabilities. To address these systemic issues, this paper proposes "Ex-Mad," a decentralized architecture leveraging blockchain technology and the Interplanetary File System (IPFS). The proposed framework integrates three core architectural layers: the user entities (advertisers and end-users), the blockchain ledger for immutable transaction recording, and IPFS for distributed content storage. Unlike traditional centralized models, Ex-Mad utilizes smart contracts to automate campaign management and enforce trustless interactions, ensuring verifiable reward distribution based on user contribution without third-party validation. Furthermore, the integration of IPFS optimizes on-chain storage costs by handling large media files off-chain while maintaining data integrity through cryptographic hashes. The system design enhances auditability through a tamper-proof ledger, eliminates single points of failure, and provides a technically robust alternative to current ad-tech intermediaries. This study demonstrates how the proposed architecture improves system efficiency, reliability, and cost-effectiveness in the digital advertising domain.
- MakaleAçık Erişim2025Scopus SJRQ3Effects of Formaldehyde Scavenger on Mechanical, Physical, and Emission Test Results in Multi-Layer Pressed Chipboard Production
Çamlibel, Osman; Peker, Hüseyin; Ayata, Ümit; Ulay, Göksel
This study investigates the effects of different formaldehyde scavenger (FS) ratios on the physical, mechanical, and chemical properties of fiberboard composites. Experimental analyses included measurements of thickness, density, modulus of rupture (MOR), modulus of elasticity (MOE), internal bond strength (IB), shear strength (SS), moisture content, thickness swelling (TS), water absorption (WA), and formaldehyde emission (FE) levels. The results indicate that an increase in the FS ratio leads to a significant decline in mechanical properties. Specifically, MOR, MOE, and IB values decreased by 17.97%, 15.65%, and 16.33%, respectively. Changes in TS and WA were also observed, with TS increasing by up to 22.68% and WA decreasing by as much as 16.90%. In terms of formaldehyde emissions, a significant reduction was observed as the FS ratio increased. At a 15% FS ratio, formaldehyde emissions decreased by 43.24%, which is considered a positive outcome in terms of environmental and health impacts. Overall, the use of FS in specific ratios reduces FE while causing certain reductions in mechanical properties. These findings highlight the importance of optimizing FS usage for the production of low-FE fiberboards.
AtıfScopus3WoS2OpenAlex1İncele - MakaleAçık Erişim2026Scopus SJRQ3Chemical Profiling and Biological Activities of Methanol Extracts and Essential Oils From Ferulago Platycarpa Boiss. & Balansa (Endemic): Enzyme Inhibition, Antioxidant, and Antimicrobial Properties
Aygül, İmdat; Öz, Mehmet; Fidan, Muhammed Said; Baltacı, Cemalettin; Akmeşe, Osman; Sefalı, Abdurrahman
This study aimed to evaluate the phytochemical composition and biological activities of Ferulago platycarpa methanol extract (ME) and essential oil (EO). The EO was obtained via hydrodistillation and analyzed by GC-MS, revealing sesquiterpene hydrocarbons as the dominant class, with caryophyllene (65.8%) and α-pinene (9.65%) as the major constituents. The methanol extract was subjected to LC-MS/MS analysis, which identified eleven phenolic compounds, with chlorogenic acid as the most abundant. The extract showed significantly higher total phenolic (1196.22±11.64 mg GAE/100g) and antioxidant (1870.00±17.69 mg QEE/100g) contents compared to the ME. In vitro enzyme inhibition assays demonstrated that the methanol extract exhibited potent inhibitory activity against carbonic anhydrase II (CA-II, ICSO= 0.023 pg/mL), acetylcholinesterase (AChE, ICSO= 110 pg/mL), and butyrylcholinesterase (BChE, IC50= 390 pg/mL). In contrast, the EO showed higher inhibition against α-amylase (IC50= 5920±10.45 pg/mL) and BChE (IC50= 1.32±0.65 pg/mL), while its α-glucosidase showed no inhibition. Antioxidant assays indicated superior activity for the methanol extract compared to the EO. Furthermore, antimicrobial testing revealed that the EO demonstrated broader and more effective antimicrobial action, exhibiting lower MIC and MBC values against several bacterial and fungal strains. Collectively, these results highlight F. platycarpa as a valuable source of bioactive compounds with promising applications in antidiabetic, neuroprotective, antioxidant, and antimicrobial therapies.
- MakaleAçık Erişim2026Scopus SJRQ2Experimental and Modeling Study of Fluidity in Ductile Iron (GGG40)
Coşar, Mehmet; Şüküroğlu, Ebru Emine; Güngör, Kadir; Çolak, Murat
Ductile irons (spheroidal graphite cast irons, SGI) are widely used in automotive and energy systems due to their high strength, ductility, and excellent machinability. The casting quality of these alloys largely depends on the flow and filling behavior of the molten metal, namely its fluidity. In this study, the effects of pouring temperature, filling time, and metallurgical quality on the fluidity of GGG40 ductile iron were investigated through both experimental and numerical approaches. Experimental trials were conducted at pouring temperatures of 1350 °C, 1400 °C, and 1450 °C; metallurgical quality levels of 10%, 50%, and 90%; and filling times of 5 s and 10 s. The fluidity lengths were measured and statistically evaluated. The results revealed that increasing the pouring temperature and metallurgical quality significantly improved fluidity, while shorter filling times allowed the molten metal to travel longer distances before solidification. Modeling studies performed using a commercial casting simulation software showed strong correlation with the experimental data. Microstructural examinations indicated that higher pouring temperatures and improved metallurgical quality led to a more homogeneous distribution of graphite nodules and an increased ferrite fraction in the matrix. The findings provide valuable insights into the influence of process parameters on the fluidity behavior of ductile iron and offer critical design data for enhancing casting quality and productivity in industrial foundry applications.
AtıfScopus1İncele - MakaleAçık Erişim2026Scopus SJRQ1Psychological Needs and Problematic Social Media Use in Adolescents: A Gender-Moderated Mediation via Sensation Seeking and Cognitive Flexibility
Dombak, Kübra; Yayla, İbrahim Erdoğan; Makas, Samet; Çelik, Eyüp; Sahranç, Ümit; Kaya, Mehmet
Background: The purpose of this study is to examine the mediating roles of cognitive flexibility and sensation seeking in the relationship between basic psychological needs and problematic social media use. Furthermore, the moderating effect of gender on indirect effects has been examined. Method: The sample of the study consisted of 838 Turkish adolescents aged between 14 and 18 (46.2% female; Mean = 15.6, SD = 1.71). Participants completed the Bergen Social Media Addiction Scale, the Basic Psychological Needs Scale, the Cognitive Flexibility Scale, and the Brief Sensation Seeking Scale. Data were analyzed using structural equation modeling (SEM) with the AMOS 26.0 program. Results: A significant relationship was found between basic psychological needs and problematic social media use (r = 0.43, p < 0.001). Both cognitive flexibility and sensation seeking partially mediated this relationship in girls (β = −0.23, p < 0.001), while fully mediating it in boys (β = 0.03, p = 0.675). Conclusions: The findings suggest that problematic social media use in adolescents may be associated with cognitive flexibility and increased sensation-seeking tendencies stemming from unmet psychological needs, and that gender plays an important role in this relationship.
AtıfScopus4WoS3OpenAlex3İncele - MakaleYalnız künye2026Scopus SJRQ3An exergoeconomic analysis of a wastewater treatment plant: investigation and optimization of sludge drying—a case study
Dagci, O.; Tozlu, A.; Berber, A.
The primary parameters in wastewater treatment plant applications are pollutant removal in compliance with standards and energy costs. This study conducts exergy, exergoeconomic, and optimization analyses on the Konya Wastewater Treatment Plant to enhance its energy efficiency. All assessments of the plant were based on actual operational data. Numerical calculations were executed using Engineering Equation Solver software. Exergoeconomic analyses were performed using the Specific Cost Method, while optimization calculations employed the Net Present Value approach. Thermodynamic calculations revealed that the exergy efficiency of the biogas engine was 30.8%, which increased to 39.8% when integrated into a cogeneration system. The overall exergy efficiency of the plant was calculated to be 35.3%, which rose to 58.6% when stabilized sludge was utilized as fuel. During the optimization phase, various drying systems were evaluated, and a hybrid greenhouse-solar-panel drying system was identified as the optimal model. The analyses indicated that the total cost was minimized at the maximum dryness value (70%), suggesting that the greenhouse-type drying system could achieve regional conditions. Compared to thermal and solar energy systems, hybrid systems have been observed to offer significant advantages in first-year costs. Optimization studies reveal that hybrid systems provide 41% greater cost savings in initial investment and operational expenses compared to thermal systems, and 29% greater savings compared to solar energy systems. Meeting the system's energy demand with fossil fuels results in annual emissions of 76,850 tons of CO₂ and 1500 tons of harmful pollutants, equivalent to removing 19,000 cars from traffic or preserving 7300 hectares of forest. Significant soil and ecosystem degradation also occurs. The use of solar energy substantially reduces these environmental impacts, improving air quality and conserving natural resources.
AtıfScopus1OpenAlex1İncele - MakaleAçık Erişim2024Scopus SJRQ1A Step towards Sustainable Education: Does an Entrepreneurial Teacher Nurture Creativity?
Saygın, Muhammet; Say, Serkan; Öztürk, İsmail Yavuz; Gülden, Bahadır; Kaplan, Kadir
This study explores the relationship between teachers’ entrepreneurial behaviors and their creativity-nurturing behaviors, with a particular emphasis on sustainability in education. While previous studies have typically examined entrepreneurship and creativity as separate concepts, often focusing on their individual dimensions, this study underscores the significance of integrating entrepreneurial and creative competencies to promote sustainable educational practices. By highlighting how teachers’ entrepreneurial and creative skills contribute to sustainable education, this study addresses the broader impact these competencies have on meeting the evolving needs and expectations of students, families, and society. This approach supports the development of a more resilient and adaptive education system that can thrive over time. The research involved 1396 classroom teachers from the Mersin province of Turkey. Analysis of the data revealed a strong positive correlation between teachers’ entrepreneurial behaviors and their creativity-nurturing behaviors, indicating that teachers who exhibit higher levels of entrepreneurial traits are more likely to engage in practices that foster creativity or that teachers who exhibit higher levels of creativity nurturing behaviors are more likely to engage in entrepreneurial practices among their students. Thus, the importance of the high-level relationship between entrepreneurial behaviors and creativity-enhancing behaviors in improving sustainability in education has been revealed. This study highlights the need to integrate entrepreneurial skills into teaching practices to support a sustainable educational framework.
AtıfScopus2WoS1OpenAlex4İncele - MakaleAçık Erişim2025Scopus SJRQ1Experimental performance assessment of two-stage thermoelectric system in a closed-cycle drying process
Osta, Muhammet Harun; Yakut, Kenan; Köksal, Hüseyin
Traditional drying systems suffer from several limitations, including high energy consumption, insufficient hygienic control, and the inability to maintain precise temperature regulation. Although alternative drying systems have been developed to address these issues, they often encounter practical challenges due to their complex structures and the need for numerous external components. To overcome these limitations, this study proposes and experimentally evaluates a novel, independently operating, two-stage thermoelectric module (TEM) system integrated into a closed-loop drying setup that eliminates the need for external heating and dehumidification components. The proposed system addresses the efficiency and hygiene problems observed in conventional dryers by simultaneously performing air heating, cooling, and dehumidification functions through compact thermoelectric devices. The drying process consists of two stages: the first involves air pre-conditioning (heating/cooling), while the second is dedicated to dehumidification. The performance of the system has been evaluated based on key metrics such as cooling and heating capacities, the coefficients of performance (COP) for both stages, moisture removal rate (MRR), and moisture removal rate effectiveness (EffMRR). Experimental studies were conducted under input voltages ranging from 3 to 7 V, relative humidity levels between 60 % and 90 %, and varying airflow rates. Under 90 % relative humidity conditions and a 7 V input voltage, the system achieved a maximum moisture removal rate of 13.1 g/h. The first-stage TEM reached a heating capacity of 68.81 W and a cooling capacity of 26.34 W, while the second stage provided 21.17 W of cooling capacity.
AtıfScopus5WoS5OpenAlex5İncele - MakaleAçık Erişim2026Scopus SJRQ1Corn Oil Oleogel With γ-Oryzanol/β-Sitosterol: Structural, Thermal, Textural, and Oxidative Characterization
Elbir Abca, Tuğba; Gençcelep, Hüseyin
In this study, a corn oil oleogel was prepared using γ-oryzanol and β-sitosterol to create a “healthier solid fat-like” structure aimed at reducing saturated and trans fat consumption. To prepare six different oleogels, a γ-oryzanol:β-sitosterol mixture (60:40) was added to corn oil at concentrations ranging from 6% to 15%. The samples were comprehensively evaluated in terms of oil-binding capacity and color; thermal behavior (including melting/crystallization properties); crystal structure; texture properties (hardness, stickiness, cohesion, and spreadability); molecular interactions and oxidative stability. The findings showed that all formulations had high oil binding capacity and that increasing the oleogelator concentration had a limited effect on oil binding. It has been determined that concentration plays an important role in the product's thermal resistance. Results show that as the oleogelator ratio increases, the structure becomes stronger and more durable; the melting behavior in thermal measurements shifts to higher temperatures. Crystal structure analyses support the formation of an oleogel network, while FTIR results indicate that the structure is formed predominantly through physical interactions. Consequently, it has been demonstrated that corn oil can acquire solid fat-like functional properties through this approach and offers a viable option for developing healthier fat formulations, particularly in spreadable products, margarine, and bakery fats.
- Kitap BölümüYalnız künye2025Electrosprayed particles for improved delivery of carotenoids, vitamins, and minerals
Öztekin, Sebahat; Najafi, Zahra; Cetinkaya, Turgay; Ayseli, Mehmet Turan; Aslan, Ismail; Göksen, Gülden; Delshadian, Zohre
Carotenoids, vitamins, and minerals have vital roles for living organisms, yet they often remain underutilized due to their poor solubility, limited stability, and low bioavailability. Thanks to electrospraying technology, innovative solutions are available to overcome these challenges compared to conventional delivery systems. Therefore, this book chapter provides comprehensive information on the principles, mechanisms, electrospraying techniques, effective parameters on particle formation and properties, regulatory aspects, and in vitro/in vivo particle delivery systems of electrosprayed carotenoids, vitamins, and minerals. The chapter is structured into five main sections. The first section gives a brief introduction to electrospraying technology and electrosprayed particles. In the second section, the focus shifts to the fundamentals of electrospray technology and detailing their underlying principles, types, and parameters. The third section delves into the specific uses of electrospraying for xbiotics, phenolic and nonphenolic compounds, with particular emphasis on the applications of electrospraying for the encapsulation of carotenoids and minerals, carotenoids, and taste-related compounds. This section also related to the impact of electrospraying on seafood quality as a good example. The fourth section provides an in-depth analysis of the stability, absorption, and bioavailability improvements of electrosprayed particle delivery systems through in vitro and in vivo studies. The final section addresses regulatory considerations, safety, and future perspectives. It reviews the current regulatory landscape for food additives and dietary supplements, emphasizing the compliance requirements for novel electrosprayed delivery systems. Through detailed scientific insights and practical applications, this chapter paves the way for innovative approaches to electrosprayed particles for improved delivery of carotenoids, vitamins, and minerals.
- MakaleAçık Erişim2024Scopus SJRQ1The Effects of Virtual Reality Intervention Before Total Knee Arthroplasty on Pain, Anxiety, and Vital Signs
Güneş, Hüseyin; Sarıtaş, Serdar
Objective: In this study, the effects of a virtual reality intervention before total knee arthroplasty on pain, anxiety, and vital signs were investigated. Methods: This randomized controlled study with a pretest-posttest design was conducted with 130 patients included in experimental (n = 65) and control (n = 65) groups. Data were collected using a patient information form, the numeric rating scale (NRS), a vital signs form, and the state anxiety inventory. The patients in the experimental group watched a 20-minute video consisting of sea, forest, waterfall, and animal visuals using virtual reality goggles. Vital signs were recorded before and after the intervention. Vital signs were recorded on the same timeline in the control group, without any intervention. Results: The patients in the experimental group displayed lowered anxiety and pain levels and improvements in their vital signs, except for temperature. There were statistically significant differences between the experimental and control groups, except for temperature and diastolic blood pressure (p < .05). Conclusion: The virtual reality intervention reduced pain, anxiety, systolic and diastolic blood pressure, heart rate, and respiratory rate. It is recommended to be implemented before surgery.
AtıfScopus9WoS8OpenAlex11İncele - MakaleAçık Erişim2024Scopus SJRQ2Evaluating STC-1 and STC-2 mRNA expressions in Schizophrenia patients with increased oxidative stress; [Évaluation des expressions d'ARNm de STC-1 et STC-2 chez des patients schizophrènes présentant un stress oxydatif accru]
Karabulut Uzunçakmak, Sevgi; Özcan, Halil; Dirican, Ebubekir; Tavacı Özçelik, Ayşegül
Introduction: Schizophrenia is a chronic psychiatric disorder characterized by cognitive impairment. Oxidative stress is associated with disease progression in patients with schizophrenia. Stanniocalcin (STC)-1 and STC-2 are two proteins commonly expressed in mammals belonging to the stanniocalcin family and they are involved in oxidative stress. The aim of this study is to investigate STC-1 and STC-2 mRNA expressions in schizophrenia patients with altered oxidative stress parameters. Methods: For this purpose, 70 patients with schizophrenia and 40 healthy individuals were recruited for the study. Peripheral blood samples were obtained from all participants. Glutathione (GSH) activities, superoxide dismutase (SOD) activities, and malondialdehyde (MDA) levels were measured. STC-1 and STC-2 expressions were assessed by real-time polymerase chain reactions. Results: SOD activity levels were lower in patients than in healthy individuals (p = 0.0309), while the patients’ MDA levels were higher (p = 0.039). STC-1 and STC-2 expressions were lower in patients than in healthy individuals (p = 0.1049 and p < 0.0001, respectively). Furthermore, these two genes had a positive correlation among the patients (r = 0.435, p = 0.0025). According to area under the curve (AUC) values, STC-2 (AUC = 0.8332, p < 0.0001) had better diagnostic power than STC-1 (AUC = 0.6167, p = 0.1037). Conclusions: The expression of stanniocalcins in schizophrenia was investigated here for the first time. Decreased STC-2 expression in patients with schizophrenia with increased oxidative stress parameters may guide the understanding of the pathophysiological mechanisms caused by oxidative stress, which may be increased in cognitive diseases such as schizophrenia, and it also has the potential to be a prognostic factor that can be used in the diagnosis of schizophrenia.
- MakaleAçık Erişim2024Scopus SJRQ3Occupational Safety and Hidden Risks in a Furniture Factory: A Comprehensive Assessment of Hazards Related to Noise, Lighting, Thermal Comfort, and Dust Exposure
Özdemir, Mustafa; Albayrak, Sirer
This study assessed the occupational health and safety conditions in a furniture manufacturing facility, focusing on key environmental factors such as noise, lighting, thermal comfort, and dust exposure. Noise measurements recorded levels as high as 95.3 dB(A) during CNC machine operations, exceeding legal exposure limits of 87 dB(A), posing significant risks to workers’ hearing health. Lighting assessments showed levels ranging from 134 to 247 lux in production lines, which falls below the recommended threshold of 300 lux for adequate visibility. Thermal comfort was evaluated with temperature readings at 14.2 °C and relative humidity at 43%, revealing marginal comfort conditions that could reduce worker efficiency and satisfaction. Dust exposure measurements indicated respirable dust concentrations reaching 3.69 mg/m³ in the cutting department, which is close to the permissible exposure limit of 5 mg/m³, raising concerns about long-term respiratory health. These findings suggest several measures to improve workplace safety, including enhanced engineering controls, mandatory personal protective equipment (PPE), improved lighting systems, optimised thermal conditions, and advanced ventilation to reduce dust exposure. This comprehensive evaluation provides critical insights for improving furniture factories’ occupational health and safety practices.
AtıfScopus6WoS6OpenAlex3İncele - DüzeltmeAçık Erişim2024Scopus SJRQ1Correction to: Salivary apelin hormone response and dysfunctional attitudes in adolescents in Türkiye: a relational screening model (BMC Psychology, (2024), 12, 1, (64), 10.1186/s40359-024-01551-w)
Kirbaş, Zila Özlem; Bayraktar, Bülent; Aktaş, Elif Odabaşi
Following publication of the original article, it came to the journal’s attention that the order of the citations (following citation of reference 22) was incorrect. The order has since been corrected in the published article.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2025Scopus SJRQ3A review and classification of conventional, advanced, smart and multifunctional glazing technologies for low-carbon building applications
Cuce, Pinar Mert; Guclu, Tamer; Cuce, Erdem
In this study, various smart window technologies are introduced, examined in terms of energy efficiency, and their advantages over existing conventional windows are presented. Smart window technologies used today are more energy efficient than traditional single and double-glazing windows. It is possible to achieve up to 80% energy savings in building heating/cooling costs compared to traditional window technologies, with a correctly selected and applied smart window technology depending on various external factors such as building facade, climatic conditions and window area. Therefore, smart windows technologies play a leading role in the realisation of nearly/zero energy building goals.
AtıfScopus1WoS1OpenAlex1İncele - MakaleAçık Erişim2024Scopus SJRQ1Energy-driven TBM health status estimation with a hybrid deep learning approach
Li, Yongsheng; Zhang, Limao; Pan, Yue; Tapkın, Serkan; Song, Xieqing
This study provides a hybrid deep learning approach that enables the researchers to estimate the Tunnel Boring Machine (TBM) health status during excavation process using energy consumption data. By analyzing the energy forms and paths in the tunneling process, the key energy factors' consumption performance behavior affecting TBM safety is identified. The Ensemble Empirical Mode Decomposition (EEMD) method and a Convolution neural network-Long short term memory-Depth Neural Network (CNN-LSTM-DNN, CLDNN) model are integrated for Health Performance Parameter (HPP) prediction. A classification method is constructed by the Generative Adversarial Imputation Networks (GAIN) model for health status estimation. The SHapley Additive exPlanations (SHAP) method is performed to quantify the relationships between energy consumption and system health status. A tunneling case in Singapore is used to test the effectiveness of the developed methodology. It is found that (1) the proposed method provides TBM cutter wear and cooling oil prediction with a R-square (R2) of 0.8591 and 0.8727, respectively, and (2) classification results indicate that the estimation F1-score of 0.9863 can be achieved based on health status evaluation indicator (HSEI). The novelty of the proposed approach lies in its capabilities of (1) fully extracting and utilizing the energy consumption information in every regard to predict TBM health performance; (2) providing a good one-step-ahead health status estimation for the TBM excavation process. Therefore, this study proposes a feasible direction for the application of energy consumption data in TBM health status estimation.
AtıfScopus17WoS15OpenAlex17İncele - MakaleYalnız künye2024Scopus SJRQ1Variations of natural frequencies of masonry minarets due to environmental effects
Yanik, Yusuf; Aymelek, Abdullah; Yildirim, Ömer; Demirtaş, Betül; Türker, Temel
It is very important to distinguish the reason of change in natural frequencies of structures either caused by a possible damage or environmental conditions (temperature and humidity). In this study, the changes in the dynamic properties of masonry and reinforced concrete minarets under environmental effects, such as temperature and humidity, were investigated. The masonry minarets of İskenderpaşa, Hacı Kasım, and Tavanlı Mosques and the reinforced concrete minarets of Karadeniz Technical University, Dilaveroğlu and Papatya Mosques in Trabzon were monitored by ambient vibration test method, and the relationship between natural frequencies and temperature and humidity was tried to be determined. For this purpose, the natural frequencies of these minarets were measured at certain intervals under different temperature and humidity conditions over a period of approximately 6 months. The vibration measurement system which was developed by our research team was used in the measurements. From the data collected by these measurements, the variation intervals of the natural frequencies (the smallest and the highest values), the percentages of change and their relations with temperature and humidity were revealed. This relationship was determined using linear–non-linear simple and multiple regression analyses. From this study, it was found that the natural frequencies change under environmental effects, such as temperature and humidity, and this rate of change was approximately 7%. There was moderate correlation in Tavanlı, Dilaveroğlu, and Papatya Minarets, and strong correlation in Hacı Kasım Minaret.
AtıfScopus16WoS17OpenAlex16İncele - MakaleYalnız künye2024Scopus SJRQ2Endoscopic Resection of Nasal Septal Chondroma
Demir, Murat; Bahadır, Osman; Çobanoğlu, Hatice Bengü
Chondromas are benign cartilaginous tumors and rarely develop in the nasal septum. Although it causes different symptoms depending on the location and size of the tumor, the most common complaints are nasal obstruction and epistaxis. A submucosal mass narrowing the nasal passage can be seen in the septum by an endoscope. Computed tomography gives information about the localization and size of the mass. A definitive diagnosis is made by histopathologic examination. Treatment is surgical excision. Endoscopic surgery provides a less invasive and successful treatment. This case series aims to share that 2 cases with a diagnosis of nasal septal chondroma were successfully treated with endoscopic surgery.
- MakaleAçık Erişim2023Scopus SJRQ3The Effects of Teacher Relationships on Student Academic Achievement: A Second Order Meta-Analysis
Göktaş, Erkan; Kaya, Metin
This study aims to determine the correlational effect sizes between teacher relationships and student academic achievement. Teacher relationships were categorized as intrapersonal and interpersonal relationship types. Intrapersonal and interpersonal relationships are directed at different individuals. Intrapersonal relations refer to the inner life and thoughts of a teacher which are effective on the way of teaching and human relations. Interpersonal relations refer to social links between a teacher and the other people of the school community. The method of the study is second order meta-analysis. In this method, effect sizes of the first order meta-analyses are combined to get an average effect size score. Totally, 17 eligible first order meta-analyses are included in the study. The findings indicate that the correlational effect size between a positive teacher intrapersonal relationship and student academic achievement is positively small, positive teacher student relationship and student academic achievement is positively medium, a positive teacher school community relationship and student academic achievement is positively at a very large level. Also, correlational effect size representing a negative teacher intrapersonal relationship and student academic achievement is negatively medium, a negative teacher student relationship and student academic achievement is negatively small. As for moderator analyses, the variance of the effect sizes is statistically significant according to the positive relationship types and the publication types. In light of the findings some suggestions were made to improve teacher and school community relations that may help teachers and students to be more successful.
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