The analysis of free and nonlinear vibrations of beam applications on elastic foundation

Bu çalışmada, değişik mesnet koşullarında iki parametreli bütünüyle ve kısmi elastik zemin üzerinde üniform kalın çubuk elemanının serbest ve nonlineer titreşimlerinin analitik ve deneysel analizi yapılmıştır. Nonlineer analizde, sadece eğilme hareketi 6 serbestlik dereceli kalın çubuk elemanı serbest titreşimleri incelenmiştir. Çubukların titreşim analizi, değişik mesnet koşullarında boyuna uzama da hesaplara dahil edilerek incelenmiştir. Elastik zemin; Winkler zemin modülü ve kayma zemin modülü ile isimlendirdiğimiz iki modülle karakterize edilen sabit iki-parametreli model olarak temsil edilir. Kayma deformasyonu, zemin rijitlik parametreleri ve kısmi elastik zemin etkilerinin yanında, nonlineer eğilme, boyuna-eğilme girişimi ve büyük yer değişimlerinden kaynaklanan nonlineer etkiler incelenmiştir. Bu analizden elde edilen analitik ve deneysel sonuçlar arasında iyi bir uyumun olduğu da gözlenmiştir. Anahtar Kelimeler: Çubuk, doğal frekans, dönme ataleti, elastik zemin, kayma deformasyonu. In the present work, the analytical and experimental analysis of free and nonlinear vibrations of uniform thick beam element on two-parameter full and partial elastic foundation is made. In the nonlinear analysis, free vibrations of 6 degrees of freedom thick beam element are only investigated. The vibration analysis is also made considering axial displacement of the beam in different end conditions. The elastic foundation is idealized as a constant two-parameter model characterized by two moduli, i.e. the Winkler foundation modulus k and the shear foundation modulus kG. In the case kG=0, this model reduces to the Winkler model, i.e. the elastic foundation is idealized as a constant one-parameter model. The effects of shear deformation; foundation stiffness parameters and partial elastic foundation are examined. Nonlinear vibrations of the beam are calculated by considering all nonlinear effects. In the nonlinear vibration analysis, nonlinear bending, longitudinal-bending and large bending displacement effect are included to nonlinearity. In addition to these effects, nonlinear bending, longitudinal and large bending displacement are examined as nonlinear effects. The results obtained from the analytical and experimental studies are presented by showing in tables and graphs and their importance in design is discussed. The numerical results obtained from this analysis are compared with the exact or available solutions in the literature, whereever possible. The analytical and experimental results and comparisons show the effectiveness of the proposed method.Keywords: Beam, natural frequency, rotatory inertia, elastic foundation, shear deformation

A tuberculosis case ımitating ınterstitial lung disease

Yirmi iki yaşında, kadın hasta. 20 gün önce başlayan ve eforla oluşan nefes darlığı ve kuru öksürük dışında yakınması yoktu. Solunum sistemi bakısında bazallerde tek tük ince raller duyuluyordu. Rutin laboratuvar tetkikleri normal olan hastanın solunum fonksiyon testinde restriktif tipte bozukluk saptandı. Tüberkülin testi pozitif (18 mm) idi. Balgam çıkaramadığı için asidorezistan basil (ARB) bakılamadı. Akciğer grafisinde sağ akciğerde daha belirgin olmak üzere her iki akciğerde yaygın daha çok periferik yerleşimli retiküler dansite artışı, sağ diyafragmanın yüksek ve düzensiz konturlu olduğu izlendi. Yüksek rezolüsyonlu bilgisayarlı tomografide sağ üst lob apikal, posterior, orta lob, alt lob apikal segmentlerde; sol üst lob apikoposterior, alt lob apikal segmentlerde daha çok periferik yerleşimli retiküler dansiteler, yer yer peribronşiyal kalınlaşmalar ve sağ orta lobdakilere bir miktar buzlu cam görünümünün eşlik ettiği dansite artışları saptandı. Bronkoalveolar lavaj (BAL) ve bronş aspirasyon sıvısındaARBmenfi idi.BALincelemesinde alveoler makrofaj %56, lenfosit %30, PNL%12, eozinofil %2 olarak saptandı. Transbronşiyal akciğer biyopsisinde diyagnostik bir bulgu izlenmedi. Yapılan incelemelerle kesin tanıya gidilemediğinden hastaya açık akciğer biyopsisi yapıldı. Histopatolojik incelemede mikroskopik olarak akciğer parankiminde düzensiz dağılım gösteren kazeifiye granülom yapı ları gözlendi ve akciğer tüberkülozu ile uyumlu olarak değerlendirildi.Yapılan Ziehl-Neelsen asidorezistan basil boyasında granülomlarda birkaç basil saptandı. Olgu, interstisyel akciğer hastalığını taklit eden atipik radyolojik bulguları nedeniyle sunuldu.Twenty-two year old, female patient. Her complaints were dyspnea with exercise and a dry cough of 20 days. A few crepitations were heard during oscultation. Routine laboratory examinations were normal. Restrictive pattern was observed in pulmonary function tests. Tuberculin test was positive (18 mm). She could not give sputum sample for acid-fast bacillus (ARB) examination. Bilateral diffuse peripheral reticular infiltrates dominating in right lung were observed in chest x-ray and right hemidiyaphragma was high with irregular contours. There were peripheral reticular densities in right upper lobe apical, posterior, middle lobe, lower lobe apical; left upper lobe apicoposterior, lower lobe apical segments in high resolution computed tomography. There were focal peribronchial thickenings and ground glass density in right middle lobe. ARB was negative in bronchoalveolar lavage (BAL) and bronchial aspiration fluid. BAL fluid revealed 56% alveolarmacrophages, 30% lymphocytes, 12% PNL, 2% eosinophils. Non-diagnostic findings were observed in transbronchial lung biopsy. Since these tests were non-diagnostic, open lung biopsy was performed. Microscopic histopathological examination revealed scattered granuloma with caseification necrosis compatible with pulmonary tuberculosis. A few tuberculosis bacilli were detected in granuloma by Ziehl-Neelsen staining. The case was presented for atypical radiological findings imitating interstitial lung disease

The Types of Injury, Regions and Frequency in Athletes Participating Universities Taekwondo Championchip

This study aims to determine the rates of injuries, the types of injuries and what part of the body is mostly injured in professional taekwondo sportsmen during competitions. This study involves 287 sportsmen participated in the interuniversity Taekwando championship in Ordu. Injuries during a match of the championship was determined by a team. The characteristics and types of injuries, the sportsmen’s verbal expressions were registered by a pre-determined team, and it was mentioned about how these injuries occurred, in which part of the body the injuries were seen. Among 287 sportsmen in this study, 178 sportsmen were male, 109 ones were female. 46 universities took part in this championship. The championship lasted three days and total 271 competitions were done. 539 injuries were determined in total. The mostly seen type of injury was hematoma (43%), the mostly injured part was in lower extremities 416 (77%), most of the injuries were ones seen in defense (36%). No injuries were not observed in neck, shoulder, spine or trunk and cerebral injuries were not also observed. As a result of the study, it was explained that most of the injuries seen in the taekwondo competitions did not require the medical intervention and the lower extremities were mostly injured in these competitions. In the light of these findings, it could be said that these parts be protected during the competitions and the defense techniques be different

Effects of the COVID-19 Pandemic on Bladder Cancer Diagnosis and Treatment Processes; A Turkish Multicenter Study

Objective: The coronavirus disease-2019 (COVID-19) pandemic effect diagnosis and treatment of certain conditions, including bladder cancer (BC). This study aimed to evaluate the effects of the COVID-19 pandemic on BC diagnosis and treatment.Materials and Methods: Following the approval of the ethics committee for the study, data of 869 patients who underwent surgery for BC in the 2-year period between March 1, 2019 and February 28, 2021 were analyzed retrospectively. The number of surgeries performed for BC, the time elapsed between symptoms and diagnosis, the treatments performed, and the operative pathologies were compared before and during the COVID-19 pandemic.Results: During the COVID-19 period, there was a decrease in the total number of BC surgeries compared to the pre-COVID-19 period (p=0.004). It was observed that this decrease was due to a decrease in patients newly diagnosed with BC (p=0.001) as well as the decrease in the number of primary transurethral resection for bladder tumor procedures performed. There was no difference in the tumor stages of the patients at diagnosis (p=0.9). Intracavitary Bacillus Calmette-Guerin therapy use in high-risk non-muscle invasive bladder cancers (NMIBC) patients also decreased (p=0.008) during the pandemic period. It was observed that the time between symptom and diagnosis was longer in MIBC than in NIMBC during both periods (p<0.001).Conclusion: Diagnosis and treatment of BC have been adversely affected by the ongoing COVID-19 pandemic. The decrease in the number of new diagnoses may not reflect a true decrease in BC incidence, meaning that BC cases that arose during the pandemic are likely to be diagnosed at a more advanced stage

Effect of the COVID-19 Pandemic on Radical Prostatectomy: A Turkish Multicenter Study

Objective: The present study examines the effects of the coronavirus disease 2019 pandemic on radical prostatectomy performed as part of localized prostate cancer treatment in Turkey. Material and methods: A retrospective analysis was made of the data of 176 patients from 8 centers in Turkey who underwent radical prostatectomy due to localized prostate cancer over the 2 years spanning March 1, 2019, to February 28, 2021. Within this timeframe, March 1, 2019, to February 28, 2020, was denoted the 1-year pre-coronavirus disease 2019 period, while March 1, 2020, to February 28, 2021, was denoted the 1-year coronavirus disease 2019 period. An analysis was made of whether there was a difference in the number of radical prostatectomies performed for prostate cancer, the time from biopsy to operation, and the biopsy and radical prostatectomy pathology between the 2 periods. Results: It was found that the number of radical prostatectomies performed for localized prostate cancer during the coronavirus disease 2019 pandemic was statistically and highly significantly fewer than in the pre-coronavirus disease 2019 period (P < .001). The patients diagnosed with Gleason 3 + 3 (low risk) prostate cancer were statistically significantly fewer in number in the coronavirus disease 2019 period (P < .001). The pathological Gleason score was upgrading than the biopsy Gleason score in all patients who underwent in both periods (P < .001). When the periods were compared, the pathological involvement determined by lymph node dissection performed during radical prostatectomy was found to be decreased in the coronavirus disease 2019 period, although the difference was not statistically significant (P = .051). Conclusion: As with many diseases, the diagnosis and treatment of prostate cancer have been adversely affected by the coronavirus disease 2019 pandemic. © 2022, AVES. All rights reserved

Misconceptions in phenomenological research in educational administration: An analysis based

The present study intends to determine the ways followed and misconceptions held in the studies of phenomenological research design by analysing the theses in the field of educational administration. By using the database of the Turkish Council of Higher Education Thesis Center, forty master's and ten doctoral theses conducted between the years 2010-2017 in the field of education administration were reviewed and analysed methodologically. The results indicated that researchers did not benefit from international literature on phenomenological research, the aims and objectives of the theses were not appropriate for employing phenomenology, the study groups of the theses were structured in an unfavourable way, the interview questions used to collect data were not directed to the essence of experience, appropriate methods for the process of data analysis process were conducted, and the interpretation of the findings included problematic points. These misconceptions held in phenomenological research were mostly due to not dominating the philosophical underpinnings of phenomenology. Therefore, the researchers planning to conduct their research under the skin of phenomenology need to read enough about and to gain insights into the phenomenological research design before the beginning of their studies

Do Peripheral and Extra Musculoskeletal Manifestations Have An Impact on Biologic Dmard Prescribing Patterns in Axial Spondyloarthritis: the Results of Treasure Experience

[No Abstract Available

Effect of Modification of Lifestyle on Reproductive Potential Yașam Tarzı Değișikliğinin Üreme Potansiyeline Etkisi

ABSTRAC

Türkiye’de Yükseköğretimin Uluslararasılaşması: Bir Endeks Oluşturma Çalışması

The aim of this study is to test the validity and reliability of the Internationalization Index of Higher Education in Turkey, which provides a ranking of institutions of higher education in Turkey according to their degree of internationalization. The item discrimination, construct validity (exploratory and confirmatory factor analyses), and internal consistencies of the index’s indicators and subindicators were tested using data obtained from 300 faculty members. The findings obtained showed that the index was made up of five indicators—(i) university research performance, (ii) curricular efficiency, (iii) international linkages, (iv) student support, and (v) urban sufficiency—as well as of 33 subindicators, and that the index was valid and reliable. The study then made use of the Delphi method to establish the weight of the index’s indicators and subindicators. In sum, it can be said that the study effectively constitutes a proof toward utilization of the Internationalization Index of Higher Education in Turkey for the ranking of institutions of higher education in terms of internationalization.Bu çalışmanın amacı, Türkiye’de yükseköğretim kurumlarının uluslararasılaşma derecelerine göre sıralanmasını sağlayan Türkiye’de Yükseköğretimin Uluslararasılaşma Endeksinin geçerlik ve güvenirliğini sınamaktır. Endeks gösterge ve alt göstergelerinin madde ayırt ediciliği, yapı geçerliği (açımlayıcı ve doğrulayıcı faktör analizi) ve iç tutarlıkları 300 öğretim üyesinden elde edilen veriler kullanılarak test edilmiştir. Elde edilen bulgular endeksin, (i) üniversite araştırma performansı, (ii) eğitim programı yeterliği, (iii) uluslararası bağlantılar, (iv) öğrenci desteği ve (v) şehir yeterliği olmak üzere beş gösterge ve 33 alt göstergeden oluştuğunu, geçerli ve güvenilir olduğunu göstermiştir. Çalışmada daha sonra Delphi tekniği kullanılarak endeks gösterge ve alt göstergelerinin ağırlıkları belirlenmiştir. Sonuç olarak, Türkiye’de Yükseköğretimin Uluslararasılaşma Endeksi’nin yükseköğretim kurumlarının uluslararasılaşmalarına göre sıralanmasına yönelik olarak kullanılması için bir kanıt niteliğinde olduğu söylenebilir