Yayınlar
Koleksiyondaki öğeler
- MakaleYalnız künye2023Scopus SJRQ1Brain MRI high resolution image creation and segmentation with the new GAN method
Altun Güven, Sara; Talu, Muhammed Fatih
Brain magnetic resonance imaging segmentation is a recent and still popular research area. Good and accurate segmentation results play an important role in the diagnosis of cancer or other brain diseases. In this article, a novel Generative Adversarial Network architecture is proposed for brain magnetic resonance imaging segmentation. The proposed method is called SSimDCL (Supervised SimDCL). Four studies were conducted in this article. In the first study, the SSimDCL method on the two-dimensional brain magnetic resonance imaging dataset was compared with the current state-of-art architectures CycleGAN, CUT, FastCUT, DCLGAN, and SimDCL. In the second study, the dataset resolution was improved. In the third study, being measured the efficiency of the newly created dataset. And the SSimDCL is trained for both the dataset with increased resolution and the normal dataset, and the results are obtained. In the fourth study, the results of the SSimDCL and the VolBrain brain magnetic resonance imaging segmentation results, which are widely used today, are included. When VolBrain segmentation and SSimDCL segmentation are compared. The results were compared both visually and metrically. Fréchet Inception Distance (FID), Kernel Inception Distance (KID), Peak Signal to Noise Ratio (PSNR) and Learned Perceptual Image Patch Similarity (LPIPS) were used as measurement metrics. The Jaccard and Dice similarity metrics were also used in the analysis. It was observed that the SSimDCL give satisfactory results in all four studies. This method can be used as an automatic brain MRI image segmentation system.
AtıfScopus42WoS31OpenAlex42
İncele - MakaleYayıncıda açık erişim2023Scopus SJRQ1Impact of high-pressure homogenisation of milk on physicochemical, microbiological, and textural characteristics of sheep milk yoghurt
Sert, Durmuş; Mercan, Emin; Tanrıkulu, Mehmet
Yoghurt samples were produced from sheep milk that was high-pressure homogenisation (HPH) treated at 0 (control), 30, 50, 70 and 100 MPa. Depending on the acidification kinetic parameters, HPH treatment increased the acidification rate and shortened the fermentation time. HPH-treated samples had lower pH, increased water holding capacity, decreased syneresis, decreased particle size and higher acetaldehyde content than the control. At 0 and 14 days of storage, the tyrosine value of HPH-treated samples was higher than the control. Although HPH resulted in higher L∗ and a∗ values, it caused lower b∗ values in yoghurt samples. Up to 30 MPa, HPH increased firmness and consistency; however, these were decreased above 50 MPa. During storage, Streptococcus thermophilus and Lactobacillus bulgaricus counts ranged from 6.12 to 8.20 log cfu g−1 and 5.70 to 8.96 log cfu g−1, respectively. Depending on the increasing pressure, HPH caused higher S. thermophilus and L. bulgaricus counts.
AtıfScopus8WoS5OpenAlex10İncele - MakaleAçık Erişim2024Scopus SJRQ1Classification of Student Leadership Profiles in Diverse Governance Settings: Insights from Pisa 2022
Görgülü, Deniz; Coşkun, Fatma; Sipahioğlu, Mete; Demir, Mustafa
Student leadership prepares students for responsibilities, such as taking on specific tasks and assuming leadership roles in their future personal and professional lives. Developing students’ leadership profiles is among the important goals of educational systems aiming for future generations to take responsibility and advance their countries. With this perspective in mind, the PISA assessment includes items to measure students’ leadership behaviors. This study aims to extract student leadership profiles from the leadership-related items in the PISA 2022 application, using data from Cambodia, Peru, Paraguay, and Guatemala, which have different governance systems and cultural characteristics. The second purpose of the research is to determine the distribution of the identified leadership profiles in these countries and explain them in the context of governance and cultural characteristics. Latent class analysis was used to determine student leadership profiles. Accordingly, two-class and three-class latent models were found to be the most suitable models to explain student profiles. While the distinction between student profiles is more pronounced in the two-class model, the three-class model provides more detailed information about student profiles. In this respect, two-class and three-class latent models are reported comparatively. In the two-class latent model, students are labeled as the “Shy or Lack of Self-Confidence Group” and the “Active Leader or Influential Group”. In the three-class latent model, students are labeled as the “Moderate or Passive Leader Group”, the “Strong Leader or Influential Group”, and the “Avoidant or Leadership-Uncomfortable Group”. In both models, it is one of the striking findings that Cambodian students are in the low leadership profile, and Peruvian students are in the high leadership profile.
AtıfScopus2WoS1OpenAlex1
İncele - MakaleYalnız künye2024Scopus SJRQ2Do the natural and herbal remedies used for fighting against COVID-19 pose a risk for surgical patients?
Özkan, Meral; Güneş, Hüseyin
Introduction: To determine what natural and herbal remedies were used in the fight against COVID-19 and analyze the potential of these products to create a risk for surgical patients. Methods: The study was conducted with a descriptive and cross-sectional research design. The data were collected between September and October 2021. In the study, convenience sampling, which is a non-probability sampling method, was used. An online questionnaire was applied to the participants on social media platforms. In the data collection process, 1 488 individuals were reached. Results: The most frequently used herbal remedies by the participants were garlic (62.8%), ginger (53.4%), linden (42.3%), turmeric (37.9%), and oregano (35.6%). The most frequently used natural remedies were lemon (65.4%), honey (53.8%), yogurt (47.2%), traditional soups (33.5%), and vinegar (33.1%). The most frequently used supplements of vitamins were vitamin D (42.4%) vitamin C (41.1%), vitamin B12 (22.4%), vitamin E (8.7%), and fish oil/Omega-3 fatty acids (7.5%). Among the participants who reported that they used natural and herbal remedies (n = 710), only 6.9% were determined to have undergone a surgery in this period. Furthermore, 89.8% of these individuals who presented to the hospital for a surgery had not been asked whether they used natural or herbal remedies by healthcare professionals. Conclusion: The intake of garlic and vitamin E supplements according to the American Society of Anesthesiologists and the intake of garlic, ginger, turmeric/curcumin, and vitamin E supplements according to the Society for Perioperative Assessment and Quality Improvement Consensus Statement should be stopped before a surgery.
AtıfScopus2WoS2OpenAlex2İncele - MakaleAçık Erişim2023Scopus SJRQ1The effect of waste material generated during paper production on the rheological and structural features of asphalt binder
Yilmaz, Bahadir; Ugurlu, Nuray
In this study, the performance properties of magnesium lignosulfonate, an organic waste material produced during paper production from wood, on asphalt binder were investigated. The modification was carried out by adding magnesium lignosulfonate (MLS) at 2%, 4%, 6%, and 8% by weight to the asphalt with B50/70 penetration grade. The morphological structure, modification mechanism, and thermal decomposition temperatures of the modified asphalt binders formed by adding the MLS to the asphalt were determined by a Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FT-IR), and Thermogravimetry-Differential Thermal Analysis (TG/DTG), respectively. The physical and rheological properties of the material were determined by penetration, softening point, Rolling Thin Film Oven Test (RTFOT), Dynamic Shear Rheometer (DSR), and Rotational Viscometer (RV) experiments conducted in a laboratory. The experimental results showed that the organic-based waste additive increases the asphalt consistency, rutting, and short-term aging resistance, and decreases the temperature sensitivity.
AtıfScopus6WoS7OpenAlex7İncele - MakaleYayıncıda açık erişim2024Scopus SJRQ1Can Enzymatic Modified Pectin in Mediterranean Fruits Be Therapeutic Against Stomach Cancer?
Üstün, Selime; Kizil, Hamit Emre; Dertli, Enes
The aim of this study was to evaluate the cytotoxic effects of enzymatically modified pectin products derived from grapefruit, jujube, and kumquat on the MKN-45 gastric cancer cell line in vitro. FTIR analysis revealed that the spectra of the pectins produced were comparable to those of commercial pectin and included the characteristic peaks identified in the literature. The galacturonic acid content was measured as 612 mg/g in grapefruit pectin, 544 mg/g in jujube pectin, and 704 mg/g in kumquat pectin. DSC analysis indicated that all pectin samples and their modifications exhibited one endothermic peak and one exothermic peak. Cytotoxicity assessments revealed that the enzymatically modified grapefruit pectin demonstrated significant cytotoxic effects across all tested concentrations, with 0.075 mg/mL being the most effective. For kumquat pectin, all tested concentrations showed cytotoxic properties, with 0.3, 0.15, and 0.075 mg/mL being the most effective. In the case of jujube pectin, cytotoxic effects were observed at all concentrations except for 1.2 mg/mL.
AtıfScopus3WoS3OpenAlex3İncele - MakaleAçık Erişim2025Scopus SJRQ1Soil Permittivity Extraction by Time-Domain Free-Space Calibration-Free Microwave Measurements With No Thickness Information
Hasar, Ugur Cem; Korkmaz, Huseyin; Kaya, Yunus; Iliev, Teodor
An attractive microwave free-space method is proposed for permittivity extraction of soil samples using calibration-free time-domain measurements. Different from other similar methods in the literature which use the layer-stripping approach in the forward direction in the extraction process, its formalism is based on the layer-stripping approach in the backward direction, whereby allowing extraction of permittivity from interfacial reflection coefficient only without resorting to any thickness information, especially useful for time-domain analysis of multilayer structures having multiple reflection terms. Effects of angle misalignment, loss, and surface roughness on the extraction performance of the proposed method (PM) are analyzed by numerical examples. Permittivity measurements of three low-loss flat solid samples [polypropylene (PP), polyethylene (PE), and polyoxymethylene (POM)] were first performed by a free-space setup operating over 1–18-GHz frequency range to validate our methodology and compare its accuracy against other similar methods in the literature. Thereafter, permittivity measurements of two soil samples sieved with similar and different sizes (coarse- and fine-grained soil samples) by the same free-space setup were then considered to assess the applicability and performance of our method for electromagnetic property analysis of homogeneous and partially inhomogeneous soil samples.
AtıfScopus9WoS6OpenAlex8İncele - MakaleAçık Erişim2024Scopus SJRQ2Green synthesis of (S)-1-(furan-2-yl)propan-1-ol from asymmetric bioreduction of 1-(furan-2-yl)propan-1-one using whole-cell of Lactobacillus paracasei BD101
Bülbül, Ali Savaş; Şahin, Engin
Chiral heterocyclic alcohols are important precursors for production of pharmaceutical medicines and natural products. (S)-1-(furan-2-yl)propan-1-ol ((S)-2) can be used production of pyranone, which can be used in the synthesis of sugar analogues, antibiotics, tirantamycines, and anticancer drugs. The synthetic approaches for (S)-2, however, have substantial difficulties in terms of inadequate enantiomeric excess (ee) and gram scale synthesis. Moreover, the biocatalytic synthesis of (S)-2 is unknown until now. In this study, the synthesis of (S)-2 was carried out by performing the asymmetric bioreduction of 1-(furan-2-yl)propan-1-one (1) using the Lactobacillus paracasei BD101 biocatalyst obtained from boza, a grain-based fermented beverage. (S)-2 was obtained with >99% conversion, >99% ee, and 96% yield under the optimized conditions. Furthermore, in 50 h, 8.37 g of 1 was entirely transformed into (S)-2 on gram scale (96% isolated yield, 8.11 g). This is the first report on the high-gram scale biocatalyzed synthesis of enantiopure (S)-2. These data suggest that L. paracasei BD101 can be used to bioreduction of 1 in gram scale and efficiently produce (S)-2. Furthermore, these findings laid the base for future study into the biocatalytic production of (S)-2. It was particularly notable as it was the highest known to date optical purity of (S)-2 generated by asymmetric reduction using a biocatalyst. This work offers a productive environmentally friendly method for producing (S)-2 using biocatalysts.
AtıfScopus10WoS10OpenAlex12İncele - MakaleYalnız künye2023Scopus SJRQ2Prediction of gamma ray spectrum for 22Na source by feed forward back propagation ANN model
Teke, Cagatay; Akkurt, Iskender; Arslankaya, Seher; Ekmekci, Ismail; Gunoglu, Kadir
The radiation has been used in a variety of different fields since its discovery and thus its measurement becomes vital in these industries. Different type detector may be used to measure gamma rays depends on the purposes of measurements. Gamma ray energy spectrum is an important to determine either elemental analysing of a sample or radiation shielding purposes. On the other hand, Artificial Neural Network (ANN) may be used to predict and analysing of gamma-ray spectrum. In this study, gamma ray spectrum from 22Na source detected in NaI (Tl) detector was estimated by ANN. There have been installed ten different ANN models to find the network structure that produces the best predictive value for the gamma ray spectrum NaI (Tl) Detector. Estimation study has been continued with the ANN model with be possessed of lowest error value. ANN model was created by using energy, distance and gamma-rays energy spectrum (called Io) values. In the ANN model developed using the feed forward back propagation algorithm, were used artificial neurons two in the input layer, ten in the hidden layer and one in the output layer. For the case of present work, the experimental data was used 70% for education, 20% for validation and 10% for testing. The estimated values obtained with the ANN model were compared with the experimental results and a good correlation has been found between them (R2 = 0.99).
AtıfScopus18WoS9OpenAlex27İncele - MakaleYalnız künye2023Scopus SJRQ2THE EFFECTS OF STRATEGY TRAINING ON THE USE OF GLOBAL READING STRATEGIES: IMPLICATIONS FROM THINK-ALOUD AND EYE-TRACKING DATA
Bilici, Ozlem Utku; Subasi, Gonca; Dolgunsoz, Emrah
Considering the critical role of readings strategies in L2 reading this study aimed to investigate the impact of strategy training on Turkish EFL learners’ use of global reading strategies. 23 freshmen, enrolled in the ELT Department, participated in the study, and the data were collected through eye tracking and think-aloud protocols. The results are encouraging for the use of reciprocal teaching, one of the comprehension-enhancing approaches to teach reading, in the EFL contexts. Eye tracking results, hand in hand with the think-aloud protocols’ findings, revealed that the participants utilised global reading strategies more frequently to a statistically significant degree after the strategy instruction. Thus, it was concluded that strategy training was useful for the participants to improve their use of global reading strategies, and a recent technological tool can be purposefully integrated into the data collection procedure of educational research studies. Pedagogical implications on the strategy training for the employment of global reading strategies that would help students improve reading skills need to be given attention by teachers.
AtıfScopus2İncele - MakaleYalnız künye2024Scopus SJRQ1Evaluation of the seismic performance pre- and post-restoration of a masonry clock tower's FE model updated via experimental and optimization methods
Ergün, Mustafa; Tayfur, Bilal
This article presents comprehensive numerical and partial experimental studies to determine the seismic performance of the recently restored masonry clock tower in Bayburt before and after restoration. The numerical dynamic characteristics of the structure are obtained by free vibration analysis conducted on the preliminary finite element model, while the experimental ones are determined through ambient vibration testing. The ultimate finite element models reflecting the actual state of the structure pre- and post-restoration are created through a model updating process based on the principle of minimizing the differences between numerical and experimental dynamic properties via the Tabu Search Algorithm. Dynamic analyses of the models are carried out by the mode superposition method in the time domain, using eleven earthquake ground motion records selected considering the tectonic structure of the region and scaled to the design spectrum explicitly established to the site. Seismic responses are evaluated based on displacement, maximum-minimum principal stress, and maximum-minimum principal strain. The maximum principal stress value, the most critical parameter jeopardizing the safety of masonry structures, is 2.069 MPa before the restoration reaches 2.489 MPa, with an increase of approximately 20.3 % after the restoration. Since this value is less than the tensile strength of the masonry material, 3.120 MPa, it is not at a level that poses any risk to the structure. Other structural reactions also remain below the limit values. Therefore, according to today's seismic hazard analysis criteria, it can be said that the clock tower is safe. However, the North Anatolian Fault Zone, with high tectonic activity passing just south of the city, has the potential to produce severe earthquakes that may affect the region in the future. Therefore, it is necessary to periodically monitor the seismic behaviors of the historical masonry structures in Bayburt and take essential precautions based on the results.
AtıfScopus12WoS11OpenAlex13İncele - MakaleAçık Erişim2024Scopus SJRQ2Optimization of pectin extraction from crab apple peel and usage in a model meat emulsion system
Aldemir, Hazal; Kamiloğlu, Aybike; Çakır, Özlem
The aim of this study was to optimize conditions of microwave-assisted pectin extraction from crab apple peels using the Box–Behnken experimental design. For this purpose, microwave-assisted pectin extraction was performed at different extraction time (3, 6, and 9 min), liquid/solid ratio (75, 100, and 125), and pH (1.5, 2.0, 2.5). The optimum conditions were selected as extraction time (7.77 min), liquid/solid ratio (77.53 mL/g), and pH/1.79). The response, obtained under optimum conditions was determined as 0.1128 ± 0.0137 g pectin/g crab apple peel. In addition, it was determined that the obtained pectin sample had an esterification degree of 79.14% and oil and water binding capacities of 8.5 ± 0.7 g oil/g pectin and 8.1 ± 1.5 g water/g pectin, respectively. It was determined that pectin emulsions showed higher stability at 1% pectin level. The possibilities of using pectin obtained under optimized conditions as a fat replacer in a model sausage system were investigated. Pectin was evaluated in the model sausage system at two different concentrations. With the increasing pectin concentration, the cooking loss value increased from 14 to 18%, while leakage decreased from 0.31% to 0.18%, showing a negative effect on cooking loss and a positive impact on the amount of leakage into the packaging. Pectin obtained from crab apple peel has the potential to be used for reducing fat content in sausage environment.
AtıfScopus15WoS12OpenAlex14İncele - MakaleYayıncıda açık erişim2024Scopus SJRQ3Effects of titanium dioxide nanoparticles against salt and heat stress in safflower cultivars
Dinler, Burcu Seckin; Cetinkaya, Hatice; Koc, Fatma Nur; Gül, Volkan; Sefaoğlu, Fırat
This study aimed to determine the effects of titanium dioxide nanoparticle (TiO2NP) pretreatment on seeds of different safflower cultivars (Balci, Dinçer) under salt and heat stresses. The apparent effects on stress markers (malondialdehyde (MDA), hydrogen peroxide (H2O2) and superoxide radical (O2 •⁻) content), as well as changes in germination and physiological parameters (radicle and plumula weight and length measurements), were investigated. TiO2NP pretreatment caused an increase in radicle length and plumula fresh weight for the Balci cultivar under salinity. Furthermore, plumula dry weight was alleviated with TiO2NP pretreatment for both cultivars. TiO2NP pretreatment improved plumula dry and fresh weights for both cultivars under heat stress. In addition, MDA content decreased for both cultivars under heat stress but only for Balci under salt stress. The amount of O2 •⁻ radicals positively affected only the radicle for both cultivars under heat stress. This study is the first to document the alleviation of salt stress damage for the Balci safflower cultivar, and protection for both Balci and Dinçer cultivars under heat stress, using 200 ppm TiO2NP pretreatment.
AtıfScopus21WoS18OpenAlex24İncele - Kitap BölümüAçık Erişim2023Cross-cultural difference and spirituality in the workplace
Kalkan, Nimet; Şükür, Fatma Betül
This chapter aims to consider workplace spirituality from a cross-cultural perspective. The terms workplace spirituality and culture are so intangible, and both start with the attitude and behavior of humans but are meaningful in a community. Because of the constraint of understanding these abstract settings, it is necessary to define and specify the dimensions of both concepts to achieve the aim of this chapter. In this regard, the section starts with the conceptuality of workplace spirituality and the dimensions of the term, which cumulate at individual, group, and organizational levels. It goes with the part of cultural dimensions in the light of Hofstede's (2001) direction, Chhokar, Brodbeck, and House's (2007) extension, and Sharma's (2010) derivation of cultural dimensions for national, organizational, and individual levels, respectively. After joining the dots, the chapter focuses on one of the most sacred research areas for academic literature, cross-cultural differences, and workplace spirituality. The last part of the chapter is the conclusion to point to final notes about the concepts and help guide future studies.
AtıfScopus2OpenAlex2İncele - MakaleYalnız künye2024Scopus SJRQ3Physicochemical Characteristics, Phenolic Components, and Antioxidant Capacities of Lavender Honey (Lavandula Spp.) from Isparta Region of Türkiye
Kolayli, Sevgi; Can, Zehra; Kara, Yakup; Ozkok, Aslı; Ozmert Ergin, Sema; Kemal, Mehmet; Demir Kanbur, Esra
Lavender honey is one of the most desirable blossom honeys for its unique taste and aromatic qualities and can vary significantly from one region to another. In this study, melissopalynological, physicochemical and antioxidant properties of lavender honey from the Isparta region of Türkiye were investigated. The ration of the Lavandula spp. pollen were identified ranging from 9 % to 76 % in the thirteen samples. The average pH, conductivity, moisture, Hunter Lab* and proline values were 3.72, 0.22 mS/cm, 17.17 %, L*: 66.56, a*: 66.32, b*:18.41 and 576.92 mg/kg, respectively. The average F+G and F/G were 67.66 % and 1.02, respectively. The average of total phenolic (TP) and flavonoid (TF) substance were found to be 39.40 mg GAE/100 g and 3.23 mg QUE/100 g, respectively. The average total antioxidant capacity (FRAP) and DPPH radical scavenging activity values were found to be 178.28 μmol FeSO4 ⋅ 7H2O/100 g and 53.09 mg/mL, respectively. In the phenolic component analysis performed with HPLC-PDA, p-OH-benzoic acid, p-coumaric acid, chrysin and pinocembrin were detected as common polyphenols in the samples. Conclusively, despite considerable variability in their monofloral characteristics, no significant differences were observed in the physicochemical and antioxidant properties of lavender honeys.
AtıfScopus18WoS16OpenAlex18İncele - MakaleAçık Erişim2023Scopus SJRQ3Correlation Between K-value, Density Index and Bifilm Index in Determination of Liquid Al Cleanliness
Tigli, A.; Tokatli, M.; Uslu, E.; Colak, M.; Dispinar, D.
Aluminum alloys are widely used in the industry thanks to its many advantages such as light weight and high strength. The use of this material in the market is increasing day by day with the developing technology. Due to the high energy inputs in the primary production, the use of secondary ingots by recycling from scrap material are more advantageous. However, the liquid metal quality is quite important in the use of secondary aluminum. It is believed that the quality of recycled aluminum is low, for this purpose, many liquid metal cleaning methods and test methods are used in the industry to assess the melt cleanliness level. In this study, it is aimed to examine the liquid metal quality in castings with varying temperature using K mold. A206 alloy was used, and the test parameters were selected as: (i) at 725 °C, 750 °C and 775 °C casting temperatures, (ii) different hydrogen levels. The hydrogen level was adjusted as low, medium and high with degassing, as-cast, and upgassing of the melt, respectively. The liquid metal quality of the cast samples was examined by the K mold technique. When the results were examined, it was determined that metal K values and the number of inclusions were high at the as-cast and up-gas liquid with increasing casting temperatures. It has been understood that the K mold technique is a practical method for the determination of liquid metal quality, if there is no reduced pressure test machine available at the foundry floor.
AtıfScopus7WoS6OpenAlex7İncele - MakaleYalnız künye2023Scopus SJRQ1Novel PV Array Reconfiguration and Integration with a Maximum Power Point Tracking Algorithm: RMPPT
Güngör, Okan; Kahveci, Hakan
Partial shading significantly impacts the output power of photovoltaic (PV) arrays. This issue can be addressed by reconfiguring connections or positions of modules within the PV array. However, reconfiguration approaches present some drawbacks including the requirements of manual effort, complex algorithms, difficulty in implementation, and switching matrices that increase power losses. To overcome these issues, we present a low-cost and easily implemented reconfiguration method with integration into a maximum power point tracking (MPPT) algorithm for a PV array. We denote our MPPT approach as reconfigurable MPPT (RMPPT), and verify its applicability using a particle swarm optimization (PSO) algorithm, namely the reconfigurable PSO. Consequently, this approach has enhanced the output power of the PV array by at least 7.2% compared to PNO (perturb and observe) and PSO-based MPPT under realistic weather conditions.
AtıfScopus6WoS5OpenAlex5İncele - MakaleAçık Erişim2023Pain, Sleep Disturbance, and Smoking Among Patients with Coronavirus Disease Admit to The Emergency Department
İlgin, Vesile Eskici; Yayla, Ayşegül; Özlü, Zeynep Karaman; Özlü, İbrahim; Toraman, Rümeysa Lale; Toraman, Muazzez Merve
AIM: The study aimed to determine the pain, sleep disturbance, and smoking among patients with coronavirus disease 2019 who were presented to emergency departments. METHOD: This descriptive research was conducted between November 2020 and December 2021. The study population comprised 400 patients with coronavirus disease 2019 who were presented to emergency departments at Ataturk University Research Hospital and Erzurum City Hospital and who agreed to participate in the study. The data were collected by the researcher via face-to-face interviews. Personal Information Form, Fagerström Test for Nicotine Dependence, Insomnia Severity Index, and McGill Pain Scale Short Form were used to collect the data. Descriptive statistics were presented as number, percentage, mean, and standard deviation. Parametric and nonparametric methods (t-test, Kruskal–Wallis Variance, Mann–Whitney U test, and analysis of variance were used to compare variables between the groups. Ethical approval was obtained from the relevant authority prior to data collection and oral consent was obtained from all patients. RESULTS: It was determined that 52.5% of the patients were smokers; 24% of the smokers reported a decrease in smoking after being diagnosed with coronavirus disease 2019. Nicotine addiction was found to be higher in men, tradesmen, and patients aged 55–64 years. McGill pain scale emotional sub-dimension scores were higher in women, whereas the sensory sub-dimension scores were higher in married patients. McGill pain scale total scores were higher in women, unemployed patients, and those with chronic diseases. The Insomnia Severity Index was higher in women, smokers, and patients in the age group of 65–75 years. CONCLUSION: According to the results of the present study, pain, smoking, and sleep disorders in patients diagnosed with coronavirus disease 2019 were affected by sociodemographic characteristics.
AtıfScopus2WoS2OpenAlex2İncele - MakaleYalnız künye2024Scopus SJRQ1Design, modelling, environmental, economic and performance analysis of parabolic trough solar collector (PTC) based cogeneration systems assisted by thermoelectric generators (TEGs)
Cuce, Pinar Mert; Guclu, Tamer; Cuce, Erdem
Concentrating solar power systems (CSP) is a very efficient technology for clean and renewable energy production. It basically works on the principle of focusing the sun's rays with the help of a reflective surface. There are two types of CSP systems: point-focused and line-focused. Point-focused ones are parabolic dish collectors and solar towers. Line-focused ones are parabolic trough collectors (PTCs) and linear Fresnel reflectors. It is possible to reach focus temperatures over 1000 °C with point-focused CSPs. Line-focused CSP systems are used to obtain thermal and electrical energy at temperatures below 500 °C. Among CSP technologies, PTCs are widely preferred. While it can be used alone, it can also be used in combination with other power generation systems by creating hybrid systems. In this regard, hybrid PTC/TEG energy systems created with thermoelectric generators (TEGs) come to the fore. These systems have higher electrical and thermal efficiency values compared to traditional PTCs. In this study, CSP systems, PTCs, TEGs and hybrid solar energy systems-based PTCs were examined in detail. It is concluded from the study that the total thermal efficiency of PTC-TEG hybrid systems can be enhanced by up to %70 with respect to PTC systems.
AtıfScopus42WoS40OpenAlex37İncele - MakaleAçık Erişim2023Scopus SJRQ2The contact problem of a functionally graded layer under the effect of gravity
Adiyaman, Gokhan; Oner, Erdal; Yaylaci, Murat; Birinci, Ahmet
This paper considers the continuous and discontinuous contact problems of a functionally graded (FG) layer under the effect of gravity. A finite distributed load is applied to the beam from the top and the beam is placed to the top of a rigid foundation. It is assumed that the shear modulus and mass density of the beam vary exponentially whereas Poisson's ratio remains constant. The problem is solved for both continuous and discontinuous cases. In each case, the governing equations and boundary conditions of the problem are reduced to an integral equation by the help of Fourier integral transform. In the continuous contact, the integral equation solved analytically and critical load that causes initial separation between the layer and the rigid foundation, separation distance and contact pressures are investigated for various non-homogeneity parameters that presents the change in the shear modulus and density and loadings. The singular integral equation in case of discontinuous contact is numerically solved by using corresponding Gauss–Chebyshev quadrature and an iterative scheme. The effect of non-homogeneity parameters and loading on the separation distance between the layer and the foundation and contact pressures are analyzed. All the results are shown in tables and figures. It is seen that increasing stiffness and decreasing density at the top of the layer reduce maximum pressures but increase separation distances. This study aims to fill the deficiency in the mechanical behavior of the coatings under gravity.
AtıfScopus19WoS20OpenAlex17İncele
