Gümüşhane ÜniversitesiGümüşhane ÜniversitesiAçık Erişim Arşivi · RDL Open

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Yeniden eskiyeEskiden yeniye
  • MakaleAçık Erişim2024
    Effect of PGV/PGA ratio on seismic-induced vibrations of structures equipped with parallel tuned mass dampers considering SSI

    Araz, Onur

    Tuned mass damper is one of the effective methods used to reduce dynamic loads in structures under the influence of environmental loads such as earthquakes, wind, and traffic loads. In the current TMD design, the fixed base approach is mostly considered when determining the dynamic properties of the structure. However, in cases where the structure-soil interaction (SSI) is important, the frequency values of the structure are significantly different from those obtained for the fixed foundation approach. This situation negatively affects the performance of TMD operating in a narrow frequency range. Therefore, using a control system consisting of multiple TMDs connected in parallel (MTMD) instead of a single TMD may be a promising solution for the control of structural vibrations. In this study, a parameter design and efficiency assessment of MTMD for reducing the seismic responses of the structure considering SSI is studied. The particle swarm optimization (PSO) algorithm is adopted to obtain the optimum parameters (i.e., damping ratio, frequency ratio, and frequency bandwidth) of the MTMD. The effects of different support conditions, number of TMD units, and peak ground velocity (PGV) / peak ground acceleration (PGA) ratio on the performance of MTMD are also evaluated comprehensively. The dynamic responses of the structure are obtained under 42 near -fault ground motions from the time history analysis. The results reveal that ground motions with low PGV/PGA ratio can significantly increase the responses of the structure for both with and without SSI cases. Moreover, it has been observed that optimized TMDs placed parallel to the top floor of the structure are effective in reducing the seismic responses of a ten-story building considering SSI.

    • SDG 9 · Sanayi, Yenilikçilik ve Altyapı
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  • MakaleAçık Erişim2024
    Exploring the Impacts of Angelica purpurascens Extracts on Anticholinergic, Antidiabetic, Antibacterial Potential, and Antioxidant Capacity

    Topal, Meryem; Topal, Fevzi; Yilmaz, Fırat

    In Kars-Sarıkamış-Soğanlı, Angelica purpurascens (A. purpurascens) emerges as a promising natural antioxidant source. Extracts from its leaves, branches, and flowers underwent thorough bioanalytical assessments. The leaf extract exhibited the highest concentrations of herbal flavonoids (45.22 µg QE/mg extract) and total phenolics (28.96 µg GAE/mg extract). Branch extracts demonstrated significant enzymatic activity against AChE and BChE with IC50 values of 37.26 mg/mL and 9.08 mg/mL respectively. The flower extract displayed notable antibacterial properties. This study sheds light on the therapeutic potential of A. purpurascens ethanol extracts, suggesting benefits for Alzheimer’s, cell damage-induced diseases, and diabetes mellitus. It pioneers new enzymatic and antioxidant insights and contributes to understanding this abundant Türkiye species. A. purpurascens holds promise for pharmaceutical exploration, offering potential solutions for challenging health conditions.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
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  • MakaleAçık Erişim2024
    Geochemical characteristic of the Lutetian black shale (Bayburt, NE-Turkey): amount, nature, origin of organic matter and palaeo-environment conditions

    Eker, Çiğdem Saydam

    To define the amount, thermal maturity and type of organic matter (OM), a comprehensive analysis of major and trace elements, organic carbon isotope and organic geochemistry was conducted on Lutetian black shales found in the Everek (Bayburt) region of northeastern Turkey. Total organic carbon (TOC) levels in the shale samples range from 0.62% to 6.75%, and type II–III to type III kerogen is generated, displaying a combination of high terrigenous and low marine OM. The δ13C values (ranging from –28.22 to –28.23), aromatic hydrocarbon compounds (methyl phenanthrene, dibenzothiophene, tri-aromatic and monoaromatic steroids), saturated hydrocarbon compounds (sterane and terpane), acyclic isoprenoids, n-alkane distribution (n-C13–n-C36) and inorganic geochemical characterization support that the black shales were deposited in a terrestrial-marine transition environment and had a high proportion of terrestrial OM with small amounts of marine OM preserved in relatively arid to hot climate and oxic to suboxic conditions. The analysis of biomarker thermal maturity markers, Tmax (ranging from 449–458oC) and estimated vitrinite reflectance (varying from 0.92 to 1.08%) values suggest that the black shales have reached the oil window. As a result, black shales are thought to contain low to high amounts of TOC, have a mixed kerogen type, reach a high thermal maturity level and produce little hydrocarbons.

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  • MakaleAçık Erişim2024
    Effects of Electro-Muscle Stimulation Exercise Combined with Mat Pilates on Pain, Anxiety, and Strength in Sedentary Females with Fibromyalgia: A Single-Blind Randomized Controlled Trial

    Eseoğlu, İsmail; Yılmaz, Ali Kerim; Anıl, Berna; Korkmaz, Esra; Akdemir, Enes; Yılmaz, Coşkun; Kehribar, Lokman; Aydın, Nur Gökçe; Ermiş, Egemen; Yoldaş, Burak

    Background and Objectives: Fibromyalgia syndrome (FM) is a chronic pain disorder that is ranked as one of the four most common rheumatological diseases in the world. This study aims to investigate the effects of an eight-week mat Pilates and electro-muscle stimulation (EMS) with combined mat Pilates exercises on pain, depression, anxiety, and strength in sedentary women. Methods: This study is a single-blind randomized controlled trial. A total of 30 sedentary female patients (Pilates (n = 15), EMS (n = 15)) diagnosed with FM were included in the study. The patients were subjected to Beck Depression (BDIs) and Anxiety Inventories (BAIs); a Fibromyalgia Impact Questionnaire (FIQ); five different Single-Leg Hop Tests (SLHTs); modified push-up (MPU), Handgrip Strength (HGS), Deep Squat (DSQ), V-Sit Flexor, bent-arm hang (BA), sit-up and Biering-Sørensen tests; and anthropometric tests before and after the 8-week exercise program. Results: The eight weeks of mat Pilates exercises combined with mat Pilates and EMS revealed significant results (p < 0.05) in anthropometric data (abdomen, lower abdomen, hips) (p < 0.05) except for the results of chest circumference measurements (p > 0.05). In addition, there were statistically significant positive results in BDIs, BAIs, FIQs, lower extremity (all SLHTs and DSQ), upper extremity (MPU, HGS, BA), and core (V-SIT, sit-up, Biering-Sørensen test) strength test findings (p < 0.05). Conclusions: Combining the mat Pilates exercises with EMS is an effective and reliable method to improve the pain, anxiety, depression, and strength of female patients diagnosed with FM.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    İncele
  • MakaleYayıncıda açık erişim2024
    HIJACKING OF STATE POWER ON RELIGIOUS FREEDOM BY COMMUNITY ORGANIZATIONS IN INDONESIA

    Prianto, Andi Luhur; Karimullah, Suud Sarim; Idri; Ibrahim, Zumiyati Sanu; Nugraha, Aat Ruchiat; Gönan, Yavuz

    This study aims to reveal the failure of the state to use its authority to ensure the fulfilment of religious freedom for all its citizens maximally and adequately because, in practice, the state sometimes takes refuge behind the slogan of neutrality when it sees the majority group committing violent practices against minority groups. This study uses a discourse analysis method with a phenomenological approach to understanding the meaning of various events and human interactions. Meanwhile, the data was collected through literature study, media study, and observation using content analysis and discourse analysis methods in processing the data. Then this research results in the finding that opening the state accommodation gap to the demands of the majority religious group will provide space for them to take advantage of the similarities in their religious ideology with state actors and then attempt to dictate state policy. The inability of the state to be neutral in solving the problems of its people, at the same time, has given rise to the impression that a handful of certain social classes have controlled the state. Even this research results also show that tendencies of intolerance and discrimination arise in the community.

    • SDG 16 · Barış, Adalet ve Güçlü Kurumlar
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  • MakaleYalnız künye2024
    Selective Hydrogenation of Croton Aldehyde on Pt Nanoparticles Controlled by Tailoring Fraction of Well-Ordered Facets Under Different Pretreatment Conditions

    Sarıbıyık, Oğuz Y.; Resasco, Daniel E.

    This study focuses on the influence of pretreatment conditions and surface structures of well-tuned Pt nanoparticles on the selective hydrogenation of α-β unsaturated crotonaldehyde. The surface binding site preferences of the reactant during catalytic conversions are strongly influenced by the configuration of the nanoparticles’ surface fraction exposed. Since the orientation of the well-ordered surfaces are significantly affected by the pretreatment conditions, we have attempted to obtain relationships between morphology changes and catalytic activity by controlling the fraction of facets with ordered structures. Pt nanoparticles exhibit different types of exposed surfaces, namely Cubic (Cub) (100) and Cuboctahedra (CubOc) (111) + (100). These different surface structures play a crucial role in the preferential hydrogenation of the model molecule. Additionally, we investigated the impact of the pretreatment condition on the catalytic selectivity of the well-shaped nanoparticles. We employed various techniques such as high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM), transmission electron microscopy (TEM), and room temperature carbon monoxide adsorption Fourier transform infrared spectroscopy (RT-CO-FTIR) to determine the reconstructions of the particles under different pretreatment conditions. The results indicate that both the well-ordered surface fraction and pretreatment conditions of Pt nanoparticles had a moderate influence on both catalytic activity and selectivity. Overall, this study highlights the importance of analyzing the surface morphology and pretreatment conditions of nanoparticles in order to optimize catalytic activity and selectivity in reactions involving well-tuned surface structures. Graphical Abstract: (Figure presented.).

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  • MakaleAçık Erişim2024
    The role of brand identity, brand lifestyle congruence, and brand satisfaction on repurchase intention: a multi-group structural equation model

    Acar, Ayşegül; Büyükdağ, Naci; Türten, Burak; Diker, Ersin; Çalışır, Gülsüm

    This study investigated the relationship between brand identity, brand lifestyle congruence, brand satisfaction, and repurchase intention. In addition, this study examined how the primary reference group’s family and peer/friend affected individuals’ perceptions of brand identity, brand-lifestyle congruence, brand satisfaction, and purchase intention through a multi-group structural equation model. A total of 610 valid and useable responses, collected from a social media channel, were analyzed. Grounded in social identity theory and self-congruity theory, a set of hypotheses was examined within a research model. The findings show that brand identity significantly affects brand lifestyle congruence, brand satisfaction, and repurchase intentions. In addition, brand-lifestyle congruence significantly affects brand satisfaction and repurchase intentions, with brand satisfaction also significantly affecting purchase intentions. Also, high-income and elderly consumers tend to ignore the family and peer effects. Middle-aged, middle-income men who value product origin show a strong brand perception, and are less influenced by family. In contrast, women, typically lower-income and price-focused, are more receptive to family and peer effects and generally indifferent to product origin. This research advances brand identity literature by examining the effects of brand brand-lifestyle congruence, brand satisfaction, and purchase intention. It suggests that the synergy between brand identity, brand lifestyle congruence, and brand satisfaction significantly enhances repurchase intentions. Besides, examining profiles in the context of brands, consumers, and reference groups contributes additional value to the field.

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  • MakaleAçık Erişim2024
    The impact of surgical intervention on religious coping, psychological well-being, and pain levels in older adult patients: A quasi-experimental study

    Daştan, Buket; Kulakaç, Nurşen

    Aim: This study aimed to determine the impact of surgical intervention on religious coping, psychological well-being, and pain levels in older adult patients. Method: The data of the study, which used a one-group pretest-posttest quasi-experimental design without a control group, was collected between July 1, 2023, - January 30, 2024. Data collection involved the use of a Personal Information Form, the Religious Coping Scale, the Psychological Well-Being Scale, and the Visual Analog Scale. Results: The results revealed a significant increase in psychological well-being and positive religious coping after surgical intervention compared to presurgical levels (p < 0.001). Multiple linear regression analysis revealed that male gender, younger age, enhanced psychological well-being, and positive religious coping were identified as factors contributing to a reduction in postsurgical pain levels. Conclusion: The study's results indicate that surgical intervention serves as a significant variable influencing psychological well-being and religious coping among older adult patients.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
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  • MakaleAçık Erişim2024
    DEVELOPING A MODEL SOFTWARE TO DETERMINE THE EFFECT OF HIGH VOLTAGE TRANSMISSION LINES (HVTL) ON THE RESIDENTIAL LAND VALUE BY USING AHP METHOD

    Marabaoğlu, Seda Nur; Uzun, Bayram

    Due to High Voltage Transmission Lines (HVTL), easement expropriation is made and an easement price (compensation) is paid to the property owner. Since there is not a standard method, this price is calculated inappropriately and inaccurately. Therefore, either the property owner or the government suffers material damage. The main objective of this study is to determine the impact of HVTL factors on property value using the Analytical Hierarchy Process (AHP) method. Additionally, within the scope of the study, the aim is to develop a software model that automatically detects impairment rate and easement prices. In the study, a total of 79 individuals from 21 different countries participated in the national and international survey. The weights of the factors were determined using the AHP. A model software was created by integrating the weight values and the interface software of the model was created. The model software was tested with sixty expert reports prepared by different experts collected from ten different provinces. The rate of error in the expert reports was found to be at least 0.38% and at most 84.98%. With this software, an appraisal standard that will largely eliminate the existing injustices in the determination of the easement price will be provided. In addition, the inconsistencies between the expert reports of similar parcels and easements will be reduced, and easement prices will be paid fairly.

    • SDG 9 · Sanayi, Yenilikçilik ve Altyapı
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  • MakaleAçık Erişim2024
    The relationship between the psychological resilience levels and ruminative thought styles of nurses providing care for earthquake victims: 2023 earthquake in Kahramanmaraş, Türkiye

    Çobanoğlu, Asuman; Oğuzhan, Hatice

    Traumatic cases experienced during earthquakes, which are considered among acts of God, may cause multiple and severe impacts on healthcare professionals. This research aimed to examine the ruminative thought styles and psychological resilience level of nurses who provided care services to the victims after the earthquake that struck Kahramanmaraş, Türkiye on February 6-7th. This descriptive and correlational study was conducted with 225 nurses. Research data were collected using the Personal Information Form, Ruminative Thought Style Questionnaire and Brief Resilience Scale. A negative and moderate relationship was determined between the psychological resilience level of nurses and their ruminative thought style (r = -0.477, p < 0.05). The psychological resilience level of nurses who received training on disasters and psychological resilience was determined to be higher whereas their ruminative thought tendency was lower (p < 0.05). It was determined that the ruminative thought style of the nurses decreased as their psychological resilience level increased. Trainings on disaster nursing and aiming to increase the psychological resilience level may be recommended in order to improve the psychological resilience of nurses.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    İncele
  • MakaleYayıncıda açık erişim2024
    Potato leaf disease detection with a novel deep learning model based on depthwise separable convolution and transformer networks

    Catal Reis, Hatice; Turk, Veysel

    Early diagnosis of plant diseases is essential in reducing economic losses for farmers and increasing production efficiency. Therefore, Computer-Aided Diagnosis (CAD) systems supported by artificial intelligence technologies can be developed to help diagnose diseases quickly and accurately by examining the symptoms and signs in plant leaves. In this study, Multi-head Attention Mechanism Depthwise Separable Convolution Inception Reduction Network (MDSCIRNet) architecture, an image-based deep convolutional neural network, is proposed for classifying potato leaf diseases. The main components of the MDSCIRNet architecture are depthwise separable convolution (DSC) and a multi-head attention mechanism. The proposed architecture has been compared with modern algorithms developed with DSC technology, such as Xception, MobileNet, and deep learning algorithms, such as ResNet101, InceptionV3, and EfficientNetB2, to evaluate its performance in the classification process. In addition, hybrid methods developed with the classical machine learning algorithms Support Vector Machine (SVM), Logistic Regression (LR), Random Forest (RF), Adaptive Boosting (AdaBoost), and MDSCIRNet model, integrated deep learning model, hard voting ensemble learning model. Suggested methods such as these were also used in the experimental process. Moreover, techniques such as Contrast Limited Adaptive Histogram Equalization (CLAHE), Enhanced Super-Resolution Generative Adversarial Networks (ESRGAN), and Hypercolumn were used to improve the image quality of the data set. In the experimental process, the MDSCIRNet deep learning architecture achieved 99.24% accuracy in the study using the original dataset. While a 99.11% accuracy rate was achieved with the integrated deep learning model and hard voting ensemble learning model, the highest success rate of 99.33% was performed in the study conducted with the MDSCIRNet + SVM method. This study contributes to developing new and effective strategies in the agricultural industry for the early diagnosis and control of potato plant diseases. Machine learning-based approaches offer the potential to minimize economic losses and increase productivity in production by allowing farmers to intervene early.

    • SDG 2 · Açlığa Son
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  • MakaleAçık Erişim2024
    The effect of psychotherapeutic interventions on posttraumatic stress disorder symptoms, depression and self-esteem in women exposed to violence: a systematic review and meta-analysis

    Emirza, Elif Güzide; Uzun, Sevda

    This study aimed to reveal the level of effect of psychotherapeutic interventions on post-traumatic stress disorder symptoms, depression, and self-esteem in women who had been exposed to violence. For this systematic review and meta-analysis study, PubMed, Web of Science, EBSCOhost, Google Scholar, and YÖK Thesis Center databases were searched without any year limitation in August-December 2022, and 28 studies were included. The data were synthesized using meta-analysis and narrative methods. This systematic review and meta-analysis found that psychotherapeutic interventions for women exposed to violence were effective on post-traumatic stress disorder symptoms in individuals (SMD: -0,590, %95 CI: -0,893- 0.196; Z= -2,937, p = 0.003, I2= %93,59). Psychotherapeutic interventions had a significant effect on women’s depression levels in favor of the intervention group, and there was high heterogeneity between the studies (SMD: -0,475, %95 CI: -0,838- 0.113; Z= -2,569, p = 0.010, I2= %90,68). Subgroup analyses showed that cognitive behavioral therapy was effective in the treatment of intimate partner violence. It was also found that psychotherapeutic interventions did not affect women’s self-esteem levels. Psychotherapeutic therapies for women who have experienced violence have a favorable impact on them and improve their mental health.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
    • SDG 5 · Toplumsal Cinsiyet Eşitliği
    • SDG 16 · Barış, Adalet ve Güçlü Kurumlar
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  • MakaleYalnız künye2024
    The effect of anthropometric measurements and muscle endurance of the trunk and lower extremities on anatomic body awareness in healthy individuals with different levels of physical activity

    Koca, Rabia; Şen, Müşerref Ebru

    Background: The interaction between anthropometric measurements and muscular endurance and how these factors manifest in anatomical body awareness have not yet been fully investigated. It was aimed to examine the relationship between physical activity, body anthropometric measurements and endurance and anatomical body awareness in healthy individuals. Materials and methods: A total of 217 individuals aged 19–40 participated in the study. Participants were categorized into inactive (n = 65), minimally active (n = 80), and sufficiently active (n = 72) groups based on the international physical activity questionnaire (IPAQ). Anthropometric measurements including shoulder, abdomen, waist, and hip circumferences were taken. Participants’ trunk muscle endurance and lower extremity endurance was assessed through various tests. Anatomic body awareness was evaluated using the Body Awareness Questionnaire (BAQ) with established validity. Results: While no significant difference in shoulder circumference measurements was found between the inactive and minimally active groups (p > 0.05), the sufficiently active group showed significantly higher shoulder circumference measurements compared to the other groups (p < 0.05). Significant differences were observed among all endurance tests between the groups (p < 0.05). Participants’ body endurance increased significantly with higher activity levels. Moreover, anatomic body awareness exhibited significant variation among the three groups (p < 0.05), with the sufficiently active group having the highest level of anatomic body awareness. Positive correlations were found between all endurance tests and anatomic body awareness (p < 0.05), as well as a positive correlation between physical activity levels and anatomic body awareness (p < 0.05). Conclusion: It is suggested that physical performance and endurance increase anatomical body awareness when applied with appropriate treatment methods, can be applied for a healthier life and can be an additional application in the clinical environment.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
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  • MakaleAçık Erişim2024
    Analysis of grover's quantum search algorithm on a classical computer: Identifying opportunities for improvement

    Necati, Çeli̇K; Bi̇Ngöl, Özkan

    In this paper, Grover’s quantum search algorithm is analyzed using a classical computer by calculating the amplitudes and the probabilities of finding a single marked state for n=5, 10, 15, 20, 25, and 27 qubit states. The calculations show that the marked state can be found in iterations, where N = 2n is the number of items. The possibility of improving Grover’s search algorithm to find a single item in N search elements is discussed by calculating the amplitudes and hence the probabilities of finding a single marked state for n=5, 10, 15, 20, 25, 30, 35, 40, 45, and 50 qubit states. The calculations showed that the marked state could be found with sufficiently high probability in (ln(N)) iterations. This is quite a remarkable speed-up that can be achieved to find a single marked element in an unsorted N search element. Copyright 2021, Yıldız Technical University.

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  • MakaleYalnız künye2024
    Theoretical analysis of stress-strain behavior of multi-layer RC beams under flexure

    Öztekin, Ertekin

    In this study, obtaining theoretical stress-strain curves and determining the parameters defining the equivalent rectangular stress block were aimed for 3 and 4-layered rectangular Reinforced Concrete (RC) cross-sections subjected to flexure. For these aims, the analytical stress-strain model proposed by Hognestad was chosen for the concrete grades (20 MPa ≤ fck≤60 MPa) used in this study. The tensile strength of the concrete was neglected and the thickness of the concrete layers in the compression zone of the concrete cross-section was taken as equal. In addition, while concrete strength was kept constant within each layer, concrete strengths belonging to separate layers were increased from the neutral axis towards the outer face of the compression zone of the concrete cross-section. After the equivalent rectangular stress block parameters were determined by numerical iterations, variations of these parameters depending on concrete strength in layers and layer numbers were obtained. Finally, some analytical equations have been proposed to predict the equivalent stress block parameters for the 3 and 4-layered RC cross-sections and validities of these proposed equations were shown by different metrics in this study.

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  • Kitap BölümüYalnız künye2024
    The effect of digitalization in healthcare on service sustainability

    Köse, Asli

    This research evaluates how digitalization affects the sustainability of healthcare services. To achieve this, research articles published in the PUBMED and WEB OF SCIENCE databases up to June 30, 2024, were compiled. The PRISMA guidelines were followed when presenting the research findings. In the study evaluating the impact of digitalization on healthcare sustainability, a systematic review method was employed. The systematic review addresses the question of how digitalization affects the sustainability of healthcare services. The research identified two main themes. The first theme focuses on evaluating the effects of digitalization on sustainability within hospitals, healthcare workers, and patient populations. The second theme examines the impact of digitalization on sustainability concerning societal health, health worker well-being, and the overall health system.

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  • DüzeltmeAçık Erişim2024
    Correction to: Evaluation of Spiritual Care and Well-Being Levels of Individuals Diagnosed with Lung Cancer in Turkey (Journal of Religion and Health, (2024), 63, 5, (3636-3659), 10.1007/s10943-024-02088-3)

    Çakmak, Seher; Doğan, Melike Demir; Selim, Nisanur; Kalleci, Gülse Nur

    In this article, the 1st and 6th paragraphs in the “Discussion” section contain several errors. The corrected paragraphs are given below. This study aimed to assess the spiritual well-being levels and spiritual care needs of individuals diagnosed with lung cancer. The findings revealed that the patients exhibited high spiritual well-being levels, with the “harmony with nature” sub dimension scoring particularly high in relation to spiritual well-being. This aligns with several studies which reported high spiritual well-being of cancer patients (Martins et al., 2020; Rabow & Knish, 2015).” The study identified high spiritual needs among the patients, with the specific subdimension “informing them about their health” obtaining the highest scores. Notably, in the current study, it was observed that patients’ needs in terms of “informing them about their health” increased, deviating from the emphasis on love, support, and bonding seen in other studies (Kırca et al., 2023; Shi et al., 2023). This divergence is thought to be linked to differences in the disease stage. The original article has been corrected.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
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  • DüzeltmeAçık Erişim2024
    Correction to: Disease Burden and Sexual Life Experiences of Individuals with Chronic Obstructive Pulmonary Disease: A Phenomenological Study (Sexuality and Disability, (2024), 42, 1, (201-215), 10.1007/s11195-023-09821-y)

    Uzun, Sevda; Toker, Sema; Erer, İmren

    In this article the affiliation details for Author Sema Toker were incorrectly given as ‘Sundays Vocational School of Health Institutions Management Program, Dumlupinar University of Kütahya, Kütahya, Turkey’ but should have been ‘Kütahya Dumlupınar University, Pazarlar Vocational School, Kütahya, Turkey’.

    • SDG 3 · Sağlık ve Kaliteli Yaşam
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  • MakaleAçık Erişim2024
    A new method of smoothness-constrained magnetotelluric modelling with the utility of Pareto-optimal multi-objective particle swarm optimization

    Büyük, Ersin

    Particle swarm optimization, one of the modern global optimization methods, is attracting widespread interest because it overcomes the difficulties of conventional inversion techniques, such as trapping at a local minimum and/or initial model dependence. The main characteristic of particle swarm optimization is the large search space of parameters, which in a sense allows the exploration of the entire objective function space if the input parameters are properly chosen. However, in the case of a high-dimensional model space, the numerical instability of the solution may increase and lead to unrealistic models and misinterpretations due to the sampling problem of particle swarm optimization. Therefore, smoothness-constrained regularization techniques used for the objective function or model reduction techniques are required to stabilize the solution. However, weighting and combining objective function terms is partly a subjective process, as the regularization parameter is generally chosen based on some kind of criteria of how the smoothing constraints affect the data misfits. This means that it cannot be completely predefined but needs to be adjusted during the inversion process, which begins with the response of an initial model. In this paper, a new modelling approach is proposed to obtain a smoothness-constrained model from magnetotelluric data utilizing multi-objective particle swarm optimization based on the Pareto optimality approach without using a regularization parameter and combining several objective function terms. The presented approach was verified on synthetic models and an application with field data set from the Çanakkale–Tuzla geothermal field in Turkey. Findings from these analyses confirm the usefulness of the method as a new approach for all constrained inversions of geophysical data without the need to combine the objective function terms weighted by a regularization parameter.

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  • MakaleYalnız künye2024
    Evaluation of Spreadable Kefir Produced from Different Milks in Terms of Some Quality Criteria

    Aktaş, Haktan; Meral Aktaş, Hacer; Ürkek, Bayram; Şengül, Mustafa; Çetin, Bülent

    Kefir, which has many beneficial effects on health, is one of the most consumed fermented milk products worldwide. It is important to increase consumption of the fermented product for public health. In this study, it was aimed to increase the beneficial effects of kefir on public health. Therefore, kefirs produced from different types of milk (cow, buffalo, sheep, and goat) were concentrated, and obtained spreadable kefir samples were investigated in terms of their microbiological characteristic (lactic bacilli, lactic cocci, yeasts and moulds, total bacteria, and coliform bacteria), benzoic acid content, physicochemical properties (fat, total solid, ash content, acidity, pH, syneresis, viscosity, colour, and rheological properties), and sensory characteristic. It was determined that APC, lactic bacilli, lactic cocci, and yeast counts of the concentrated kefir samples changed between 6.90 and 8.64, 6.89 and 8.61, 7.42 and 8.72, and 2.17 and 5.39 log CFU/g, respectively, during storage. Mould and coliform bacteria were not detected in the samples. The concentrated kefir samples contained benzoic acid in the range of 18.30–119.58 mg/L. Results from this study showed that type of milk caused differences on APC, lactic bacilli, lactic cocci and yeast count, total solids, ash, fat, acidity, pH, syneresis, colour, viscosity and rheological parameters, and benzoic acid content. In addition, milk type affected sensory properties of the kefirs. Concentrated kefirs produced from cow and buffalo milk were the most liked by panellists. Finally, it was determined that concentrated kefir was favoured as a new product by most of the panellists.

    • SDG 2 · Açlığa Son
    • SDG 3 · Sağlık ve Kaliteli Yaşam
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