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Analyzing of continuous and discontinuous contact problems of a functionally graded layer: theory of elasticity and finite element method
No full textContact mechanics analysis is crucial because such problems often arise in engineering practice. When examining contact mechanics, the material property of the contacting components is a crucially significant aspect. It is more complex to solve the contact mechanics of systems that are composed of materials that do not have a homogenous structure compared to materials that have homogeneous qualities throughout. While many studies on contact problems with homogeneous materials exist, those involving non-homogeneous materials are scarce in the literature. As material technology improves fast, there will be a greater need to solve such problems. In this respect, analytical and finite element method (FEM) solutions of the continuous and discontinuous contact problems of a functionally graded (FG) layer are carried out in this article. The FG layer in the problem rests on a rigid foundation and is pressed with a rigid punch. From the solutions, the contact length, contact stress, initial separation distance, and beginning and ending points of separation were determined, and the results were compared. It has been concluded that the FEM findings are consistent with the analytical results to a satisfactory degree. This study analyzes contact problem using different approaches and accounts for the influence of body force in a contact geometry that has yet to be reported
Do the natural and herbal remedies used for fighting against COVID-19 pose a risk for surgical patients?
No full textIntroduction: 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.Financial support statement This study did not receive any specific grants from funding agencies in the public, commercial, or not-for-profit sectors
Covid-19 Pandemisi Sonrası Spor Bilimleri Fakültesi Akademisyenlerinin Siberkondria Düzeyleri ve İnfodemide Davranışları Beslenme Durumları ile Bazı Değişkenler Arasındaki İlişkinin İncelenmesi: Pilot Çalışma
No full textBu çalışma Covid-19 sonrası dönemde akademik personelin siberkondria ile infodemi düzeyleri arasındaki ilişkiyi ve beslenme durumlarını belirlemek amacıyla yapılmıştır. Kesitsel tipteki bu araştırma, Bayburt Üniversitesi Spor Bilimleri Fakültesinde görev yapan 23 Akademik personel ile yapılmıştır. Tüm katılımcılara demografik özelliklerinin ve beslenme durumlarının ve besin tercihlerinin belirlenmesine yönelik bir anket uygulanmıştır. Verilerin toplanmasında Siberkondri Şiddet Ölçeği-Kısa Formu, İnfodemi (Dijital Ortamda Sağlık Bilgisi Edinme ve Teyit) Ölçeği ve Besin Tüketim Sıklığı formu kullanılmıştır. Çalışmada, ölçeklerin alt faktörlerinden aşırılık ile Web 1.0 ve Sağlık Bilgisi edinme arasında ve alt faktörlerden güvence ile Web 2.0 ve Dijital sağlık bilgisi edinme arasında pozitif bir ilişki belirlenmiştir. Katılımcıların aşırılık düzeyi yani sağlıklarıyla ilgili araştırmalarının artan ve tekrar eden yapısı arttıkça, sağlık bilgisi edinme düzeylerinin de arttığı tespit edilmiştir (p<0,05). Aynı zamanda katılımcıların profesyonel tıbbi tavsiye almaya yönlendiren araştırmalar (güvence düzeyi) arttıkça, dijital sağlık bilgisi edinme düzeylerinin de artması üzerinde anlamlı bir etkiye sahip olduğu bulunmuştur (p<0,05). Çalışma sonucunda Covid-19 sonrası dönemde akademik personelin siberkondria ile infodemi düzeyleri arasında pozitif yönde anlamlı bir ilişki olduğu ortaya konulmuştur. Covid-19 pandemisi sonrası siberkondri ve infodemi davranışlarındaki artış, bireylerin beslenme durumları ile doğru besine yönelmesi konusunda diyetisyenlerin önemi ve gerekliliğini ortaya koymuştur. Mevcut sonuçlarımızın bu alanda gerçekleştirilecek çalışmalar ve araştırmacılar için önemli katkı sağlayacağını düşünmekteyiz
Examination of COVİD-19 anxiety levels of individuals over 15 years of age in terms of different variables in terms of exercise addiction
No full textLisansüstü Eğitim Enstitüsü, Beden Eğitimi ve Spor Bilimleri Ana Bilim Dalı, Beden Eğitimi ve Spor Bilim DalıBu çalışmasının amacı; 15 yaş üstü bireylerde COVID-19 kaygı düzeyinin cinsiyet, yaş, eğitim düzeyi, düzenli spor yapıp yapmama, spor yapma düzeyi, milli sporcu olup olmama, COVID-19 geçirme, COVID-19 aşısı olup olmama, aşı sayısı ve egzersiz bağımlılık düzeyine göre değişip değişmediğinin araştırılmasıdır. Bu amaçla düzenli spor yapan ve yapmayan toplam 224 gönüllü katılımcı çalışmaya dâhil edildi. Bu çalışmada nicel araştırma türlerinden betimsel tarama modeli kullanılmıştır. Araştırmanın çalışma grubunu spor yapan ve yapmayan 15 yaş üstü 224 kişi oluşturmuştur. Katılımcılara araştırmacı tarafından hazırlanan kişisel bilgi formu uygulandı. Ayrıca Tekkurşun Demir vd. (2020) hazırladıkları "Yeni Tip Korona Virüsüne (COVID-19) Yakalanma Kaygısı Ölçeği" ile birlikte yine Tekkurşun Demir vd. (2018) hazırlamış oldukları "Egzersiz Bağımlılığı Ölçeği" uygulandı. Tüm bunlar Google forms aracılığıyla uygulandı. Uygulamada toplanan ölçek formları değerlendirilmeye alınmadan önce eksik ve hatalı olduğu tespit edilen 11 ölçek formu değerlendirilmeye alınmadı. Geriye kalan 224 ölçek formu üzerinde gerekli veri analizi gerçekleştirildi. Verilerin analizinde SPSS 26 paket programı kullanıldı. Toplanan verilerin homojenliğini belirlemek için normallik testleri kullanıldı. Litaretürdeki çarpıklık ve basıklık değerleri -1,5 ile +1,5 arasında değerlere sahip olmaması verilerin normal dağılmadığını gösterir (Tabachink & Fidell, 2013) bilgisi dikkate alındığında çalışma verilerinin normal dağılmadığı görüldü. Bundan dolayı nonparametrik testler kullanılarak analizler yapıldı. Bu testlerden iki değişkenli olan verilerde Mann-Whitney U ve iki değişkenden fazla olan verilerin analizinde ise Kruskal Wallis testi kullanıldı. Analizler sonucunda, katılımcıların egzersiz bağımlılığı toplam puanlarının ortalamasının 57,38 ± 11,545, COVID-19 kaygı alt boyutlarından bireysel kaygının puanları ortalamasının 34,25 ± 10,655 ve sosyalleşme kaygı alt boyutu puanları ortalamasının ise 11,75± 5,007 olduğu görüldü. Ayrıca bireysel kaygı durumunun cinsiyet, COVID-19'a yakalanma durumu, bireysel- sosyal ihtiyaçlarının ertelenmesi ve çatışması alt boyutu, tolerans gelişimi ve tutku alt boyutu ile p<0,05 düzeyinde, yine egzersiz bağımlılığı toplam puanları ile p<0,01 düzeyinde anlamlı farklılık gösterdiği saptandı. Ayrıca Sosyalleşme kaygı durumunun ise bireysel-sosyal ihtiyaçlarının ertelenmesi kaygı alt boyutu ile p=0,000, tolerans gelişimi ve tutku alt boyutu ile p=0,013 ve egzersiz toplam puanları ile p=0,046 düzeyinde anlamlı farklılık gösterdiği belirlendi. Çalışmaya dâhil edilen diğer tüm değişkenlerin anlamlı farklılıklar içermediği saptandı. Sonuç olarak, cinsiyete, egzersiz bağımlılığına ve salgına yakalanma durumunun kaygı düzeyine etki ettiği söylenebilir.In the abstract, the subject discussed in the thesis is briefly introduced, and information is given about the purpose of the thesis study, the research method, the universe and sample of the study (or study group), the data collection tool(s) and data analysis techniques of the research, and the important findings obtained in the research. References, figures and tables are not given in the abstracts. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gub rgren, no sea takimata sanctus est Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut lab ore sit et dolore magna. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gub rgren, no sea takimata sanctus est Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut lab ore sit et dolore magna. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gub rgren, no sea takimata sanctus est Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut lab ore sit et dolore magna. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gub rgren, no sea takimata sanctus est Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut lab ore sit et dolore magna. Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut labore et dolore magna aliquyam erat, sed diam voluptua. At vero eos et accusam et justo duo dolores et ea rebum. Stet clita kasd gub rgren, no sea takimata sanctus est Lorem ipsum dolor sit amet, consetetur sadipscing elitr, sed diam nonumy eirmod tempor invidunt ut lab ore sit et dolore magna. At vero eos et accusam et justo duo dolores et ea rebum. Lorem ipsum dolor sit amet
Parkinson’s Disease Detection Via Machine Learning Using Data Splitting and Validation Methods
No full textParkinson’s disease (PD), a neurological disorder, negatively affects the lives of patients and their caregivers. PD, which is very difficult to diagnose early by examining the clinical characteristics of the person, can be diagnosed using voice recordings. However, the inconsistent performance results of the models obtained from the evaluation of voice recordings through machine learning techniques limit the usability of these models to aid in diagnosing physicians. This study used a database of 195 voice data obtained from 31 individuals, 23 of whom have PD. The classification of the voices as healthy or patient was based on the 22 features in the database. The split ratios 90/10, 80/20, 70/30, 50/50 and 30/70 were used to select the training and test phase data, respectively. In addition, each split ratio was evaluated using 10-fold cross-validation, 5-fold cross-validation, holdout validation and resubstitution validation methods in the training phase, which is the initial process that will directly affect the other classification procedures. In addition, the classification process was performed using quadratic discriminant analysis, support vector machine, ensemble bagged tree, k-nearest neighbours and neural network classifiers. All procedures were repeated 10 times to ensure consistency of results and randomisation of split ratios. As a result, the k-nearest neighbours classifier with 80/20 splitting ratio and 10-fold cross-validation was determined to be the most successful among the compared methods with 95.64±3.21% accuracy. Therefore, it can be seen that much more successful results can be obtained by analysing only the effects of the existing parameters of the classifiers
The role of attribution theory and symbolic status on consumers' luxury brand atti·tudes: A compari·son between consumers i·n Turkey and Saudi Arabia
No full textLisansüstü Eğitim Enstitüsü, İşletme Ana Bilim Dalı, İşletme Bilim DalıBu araştırma, Türkiye ve Suudi Arabistan'daki tüketicilerin lüks markalara karşı tutumlarını ve bu tutumların sembolik statü ile ilişkilendirme teorileri çerçevesinde nasıl şekillendiğini incelemektedir. Moda ve otomobil sektörlerindeki lüks markalara yönelik iki farklı tüketici anketi yapılmıştır. İlk anket, markaların statüsüne veya kişisel uygunluğuna değer veren bireyleri hedef alırken, ikinci anket ürün detaylarına ve kalitesine odaklanan yüksek gelirli tüketicilere yöneliktir. Birinci çalışma, 293 anketi analize dâhil edilmiştir. Katılımcıların çoğunluğu erkek, 25-34 yaş arası ve bekâr olup, özel sektörde çalışan ve lisans düzeyinde eğitim almış bireylerden oluşmaktadır. Prestijin sembolik statü üzerinde olumlu bir etkisi bulunduğu ve ilişkilendirme teorisinin bu ilişkide aracı bir rol oynamadığı bulunmuştur. İkinci çalışma, 179 anketi analize dâhil edilmiştir. Katılımcıların çoğunluğu yine erkek, 25-34 yaş arası ve bekâr olup, %35,2'si özel sektörde çalışmaktadır ve çoğunluğun gelir düzeyi 26662666. The analysis results showed that the AVE values for the convergent validity and reliability of the scales were above 0,50, and the CR values were above 0,878, while the Cronbach's alpha values ranged between 0,839 and 0,938, indicating the reliability of the scales. It was found that brand attitude has a positive effect on brand loyalty, but factors such as intrinsic and extrinsic motivation, avoidance of anticipated anxiety, and anticipated joy have mixed results on the mediating effect on brand loyalty
TOTAL PHENOLICS, TANNIN CONTENTS, ANTIOXIDANT PROPERTIES, PROTEIN AND SENSORY ANALYSIS OF Pleurotus ostreatus, Pleurotus citrinopileatus AND Pleurotus djamor CULTIVATED ON DIFFERENT SAWDUSTS
No full textIn mushroom cultivation, it is important to be aware of the impact of the growing substrate. This study investigated the cultivation of various oyster mushrooms, including Pleurotus ostreatus, Pleurotus citrinopileatus, and Pleurotus djamor, on different types of wood sawdust. Total phenolic content, condensed tannins, antioxidant activity by ferric reducing antioxidant power assay, protein and sensory evaluations were performed in cultivated oyster mushrooms. Wood sawdust of Fagus orientalis (oriental beech), Alnus glutinosa (alder), Castanea sativa (chestnut), and Juglans regia (walnut) were used as substrate for studied mushroom type, separately. Because champignon (Agaricus bisporus) was the most consumed mushroom, it was used as control sample. Methanolic extracts of dried mushrooms were used to measure bioactive characteristics. Pleurotus ostreatus samples cultivated in Alnus glutinosa (alder) sawdust substrate had the highest antioxidant activity. The lowest antioxidant activity values were found in Pleurotus djamor cultivated in Juglans regia (walnut) wood sawdust substrate. The highest protein content was measured in Agaricus bisporus as 13,84 %. The other highest protein concentration was found in Pleurotus ostreatus cultivated in Alnus glutinosa (alder) sawdust substrate, at 13,75 %. The lowest protein concentration belonged to Pleurotus citrinopileatus cultivated in Fagus orientalis (oriental beech) sawdust substrate as 9,86 %. While Agaricus bisporus and Pleurotus ostreatus had the highest overall appreciation score, Pleurotus citrinopileatus had the lowest. It has been observed that the substrate content has an important impact on chemical and sensory properties of the oyster mushrooms. This study provides knowledge on the chemical and sensory characteristics of three different Pleurotus mushroom species cultivated on different composts.General Directorate of Forestry of TurkiyeThis study was performed within a research project of the General Directorate of Forestry, Head of Foreign Relations, Training and Research Department on behalf and funded by the General Directorate of Forestry of Turkiye
Nonlinear optical properties of KnCl (n=2-7) superalkali clusters
No full textThe lowest energy structures along with the low lying isomer, stabilities, electronic properties, optical properties and nonlinear optical responses of KnCl (n = 2-7) clusters were studied within the density functional theory. The second order energy difference, dissociation energy and GH-L (HOMO-LUMO gap) point out that KnCl (n = 3, 5, 7) clusters are more stable. The calculated adiabatic ionization energies (AIE) for the KnCl (n = 2-6) clusters are in agreement with the measured ionization energies. The optical properties, namely optical electronegativity and refractive index, depends on the GH-L energy values. The K atom capped planar rhombus geometry of the K4Cl causes the noticeable vibrational frequency shift compared to the rest of IR spectra of the clusters. The first static hyperpolarizability (beta(o)) values are in the range of 2.33 x 10(-2.87)(3) x 10(4) au and the second static hyperpolarizability varies between 5.74 x 10(6) au and 38.9 x 10(6) au for the cluster. The nonlinear optical response is due to the superalkali nature of KnCl (n = 2-7) clusters. From computed beta(vec) values, the hyperpolarizability has projection on the dipole moment vector for the superalkalis except the K2Cl and K5Cl. The absorption spectra point out that KnCl (n = 6-7) clusters can be suitable as a NLO material since they have transparency in the deep UV region (lambda< 300 nm)
Investigation of Microbiological, Physiological and Histopathological Changes in Polymicrobial I nfection in Old Rats
No full textBackground: The aim of this study is to examine the microbiological, clinical, physiological and pathological findings of natural polymicrobial infection developing in a wistar rat colony under long-term observation. Methods: In this study, 70 male Wistar albino rats, 3 years old, raised by conventional methods and housed in a cage environment were used. Thirteen rats with clinical symptoms such as torticollis and rotation were sacrificed for microbiological and histopathological examination after 14 days. For microbiological examination, the rapid diagnostic kit BBL Crystal system was used to identify bacterial agents in tissue and stool samples and the traditional culture method was used for isolation. Result: As a result of microbiological analysis, the rarely isolated Staphylococcus capitis ( S. capitis ) was isolated. Different Staphylococcus spp. It has been determined that the species can cause suppurative meningoencephalitis as well as septicemia in the brains of experimental animals., it is thought that polymicrobial infection will be useful for the identification of bacterial agents and infection prevention and treatment strategies
Antioxidant properties and aldose reductase inhibitory potency of Viscum album L. extracts: experimental and computational insights
No full textThis study systematically investigates the antioxidant capacity and inhibitory impact of Viscum album L. plant extracts on the aldose reductase (AR) enzyme through a combined approach of in vitro and in silico methods. Various sections derived from distinct plant parts were examined, revealing potent inhibitory potential. Notably, the methanol extract sourced from the plant's stem displayed remarkable efficacy with an IC50 value of 0.156 mu M. Total phenolic content and antioxidant capacity analyses were conducted, highlighting variations across plant parts and solvent types. Qualitative and quantitative phenolic compound content in the extracts was elucidated by LC-MS/MS analysis, revealing higher levels of quinic acid, fumaric acid, and chlorogenic acid. Molecular docking studies further substantiated the inhibitory roles of key compounds like chlorogenic acid and fumaric acid, elucidating their interactions with specific amino acid residues within the AR enzyme's active site and shedding light on the underlying mechanisms. Collectively, this study underscores Viscum album L. extracts as promising candidates for aldose reductase modulation. By merging experimental and computational techniques, the study presents a holistic understanding of natural compound interactions, potentially influencing drug development and herbal therapeutics