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Boosting the performance of bolt-microtubular solid oxide fuel cells through surface pattern tuning
Get PDFA number of bolt-microtubular anode supports (BMASs) are manufactured by winding the corresponding thin tapes on threaded rods of different thread pitches and depths, followed by co-lamination using isostatic press. Bolt-microtubular cells (BMCs) are also constructed on BMASs to investigate the effects of the created surface patterns on the cell performance and microstructure. The bolt-microtubular cell, whose anode support is patterned by using a threaded rod with 0.8 mm thread pitch and 0.4 mm thread depth, exhibits similar to 92% higher maximum performance than that of the reference cell at 800 degrees C under 0.3 NL/min hydrogen flow and stagnant air. The almost doubled performance is mainly due to the increase in anode-electrolyte and cathode-electrolyte interfacial areas by the surface patterns created. The cell is also subjected to a 200-h life test at 800 degrees C and 0.7 V and demonstrates a stable performance.Scientific and Technological Research Council of Turkey (TUBITAK) [222M185]; TUBITAKThis study was supported by Scientific and Technological Research Council of Turkey (TUBITAK) under the Grant Number 222M185. The authors thank to TUBITAK for their supports
Effects of changing water content of clay-content rocks on field cutter consumption rate of roadheaders: a case study of porous ignimbrites
Get PDFThe changing formation characteristics during excavation can cause a higher cutter consumption rate (CCR) of mechanical excavators than theoretically estimated before the project begins. This study investigates the adhesive potential of clay-content porous ignimbrites in increasing water content and their effects on the CCR of roadheaders. For this purpose, the actual field CCR data of roadheaders were recorded for ten cold storage caverns (CSC) projects during the excavation in dry and wet conditions. Then, laboratory tests were carried out on the rock samples collected from project areas. CCRs of roadheaders were theoretically estimated based on the Cerchar abrasivity index of rocks using three different empirical models. The laboratory test results showed that increasing water content reduces the abrasivity and strength of the rocks. The theoretically estimated results also showed that CCR is to be less under saturated conditions. However, actual field data revealed higher CCRs for all CSC projects in wet conditions. Therefore, the adhesion potential of rocks in different water contents was analyzed, and positive relationships were obtained between the field CCR in wet conditions and the adhesion potentials of excavated rocks with 15%, 20%, and 25% water content. New equations were developed to estimate the CCR of roadheaders, especially in excavating rocks that have an adhesive potential to cutters, such as clay-content rocks. It has been concluded that for an accurate CCR estimation, more than theoretical calculations will be required, and changing formation conditions should also be analyzed in detail.Scientific and Technological Research Council of Turkiye (TUBITAK) [120M145]; HOYUK Construction Company; KEMPAR co. ltd.Open access funding provided by the Scientific and Technological Research Council of Turkiye (TUBITAK). In this study, a part of the data given in Jahid Bayramov's MSc thesis was used after developing through further field and laboratory studies. A part of the field studies was supported by the Scientific and Technological Research Council of Turkiye (TUBITAK, Grant No. 120M145); therefore, the authors would like to thank TUBITAK. The author greatly appreciates the HOYUK Construction Company and KEMPAR co. ltd. for their support
Hâkânî-yi Şirvânî and Bahrü'l-Ebrârı
Get PDFSosyal Bilimler Enstitüsü, Türk Dili ve Edebiyatı Ana Bilim DalıHâkânî-yi Şîrvânî'nin Bahrü'l-Ebrâr adlı kasidesi Fars ve Türk edebiyatlarında çok derin izler bırakmış bir eserdir. Etkisi asırlara sâri böyle bir eser dünya edebiyatları içerisinde bile eşine az rastlanır bir özellik arz etmektedir. Bu çalışmada fars edebiyat tarihindeki önemi kadar Türk edebiyatı tarihinde de önemli bir yeri olan Hâkânî-yi Şîrvânî'nin Bahrü'l-Ebrâr adlı kasidesi konu olarak seçilmiştir.Kendisi de bir Türk olan Hâkânî-yi Şîrvânî'nin bu kasidesi kendisinden sonra gelen Türk şairlerini de etkilemiş ve bu bağlamda Nâsır-ı Husrev Hint sahasında, Ali Şir Nevayî Çağatay sahasında, Fuzûlî Irâk-ı Acem sahasında ve Nef'î ile Yenişehirli Avnî ise Osmanlı sahasında bu kasideye aynı dil, vezin ve kafiyede nazireler yazmışlardır. Hâkânî-yi Şîrvânî'nin Bahrü'l-Ebrâr'ının bu tarihî ve kültürel önemi bizi bu kaside üzerinde özel olarak bir tez yapma düşüncesine sevketti. Bu amaçla Hâkânî-yi Şîrvânî'den önce ve sonra bu vezin ve kafiye ile şiir yazan yüz on bir şairin matla beyitlerini tespit ederek Türkçeye tercüme ettik. Ardından Hâkânî-yi Şîrvânî'nin Bahrü'l-Ebrâr'ının önemi üzerine bir değerlendirme yaparak şiirin Farsça metnini, o metnin latin harflerine aktarılmış biçimini ve Türkçe Tercümesini yaparak kasidenin kısa bir şerhini yaptık. Ümit ediyoruz ki bu çalışma bu haliyle konuya ilgi duyan bilim insanları için yararlanacakları bir metin olacaktır. Anahtar Kelimeler: Hâkânî-yi Şîrvânî, Bahrü'l-Ebrâr, kaside, nazire, klasik Türk edebiyatı.Hâkânî-yi Şîrvânî's ode Bahrü'l-Ebrâr is a work that has left deep traces in Persian and Turkish literature. Such a work, whose influence spans centuries, is a rare feature even in world literatures. In this study, Hâkânî-yi Şîrvânî's ode called Bahrü'l-Ebrâr, which has an important place in the history of Turkish literature as well as its importance in the history of Persian literature, has been chosen as the subject. This ode of Hâkânî-yi Şîrvânî, who was also a Turk, also influenced the Turkish poets who came after him, and in this context, Nâsır-ı Hüsrev wrote verses in the same language, verse and rhyme in the Indian field, Ali Şir Nevayî in the Çağatay field, Fuzûlî in the field of Irâk-ı Acem, and Nef'î and Yenişehirli Avnî in the Ottoman field. This historical and cultural significance of Hâkânî-yi Şîrvânî's Bahrü'l-Ebrâr led us to think of making a special thesis on this ode. For this purpose, we identified the matla couplets of one hundred and eleven poets who wrote poetry with this verse and rhyme before and after Hâkânî-yi Şîrvânî and translated them into Turkish. Then, we made an evaluation on the importance of Hâkânî-yi Şîrvânî's Bahrü'l-Ebrâr and made a short commentary of the ode by making the Persian text of the poem, the Latin version of that text and the Turkish translation. We hope that this study will be a useful text for scientists who are interested in the subject. Key Words: Hâkânî-yi Şîrvânî, Bahrü'l-Ebrâr, ode, nazire, classical Turkish literature
Determination of healthy lifestyle behaviors of academic staff working at Niğde Ömer Halisdemir University
Get PDFSağlık Bilimleri Enstitüsü, Antrenörlük Eğitimi Ana Bilim Dalı, Hareket ve Antrenman Bilimleri Bilim DalıAraştırmanın amacı, Niğde Ömer Halisdemir Üniversitesi'nde görev yapan akademik personelin sağlıklı yaşam biçimi davranışlarını ve bu davranışları etkileyen faktörleri ortaya çıkarmak amacıyla tanımlayıcı olarak yapılmıştır. Araştırmanın evrenini, Niğde Ömer Halisdemir Üniversitesi'nde akademik personel olarak görev yapan 626'sı erkek, 452'si kadın olmak üzere toplam 1078 kişiden, Örneklem seçilmeksizin evren örneklem olarak kabul edilmiş, araştırmaya gönüllü olarak katılan 162'si kadın, 230'u erkek olmak üzere toplam 392 akademik personele ulaşılmıştır. Veriler, Temmuz - Aralık 2023 tarihleri arasında, katılımcıların cinsiyet, yaş, medeni durum, akademik ünvan, haftalık ders yükü, gerçekleştirilen akademik faliyetin sayısı gibi özelliklerinin belirlenmesine yönelik , 8 sorudan oluşan bireysel özellikler içeren anket formu ve 52 ifadeden oluşan, Walker ve ark. tarafından geliştirilen Bahar ve ark. tarafından Türkçeye uyarlama çalışması yapılan sağlıklı yaşam biçimi davranışları ölçeği-II' ile toplanmıştır. Veriler değerlendirilmesinde SPSS 25.0 programı kullanımıştır. Akademik personelin sağlıklı yaşam biçimi davranışları ölçeği II.'den aldığı puanların normal dağılım gösterip göstermediğini saptamak için Shapiro ve Kolmogorov- Smirnov testleri uygulanmış uygulanan testler neticesinde verilerin normal dağılım sergilediği sonucu bulunmuştur. Normal dağılım gösteren puanları; Bağımsız örneklem t testi, Anova testi ile değerlendirilmiştir. Anlamlılık düzeyi p<0.05 olarak kabul edilmiştir. SYBD ölçeği toplam puanı 132,08±20,24, alt boyut ölçek puanları ise; sağlık sorumluluğu 21,42±4,80, fiziksel aktivite 16,16±4,65, beslenme 21,15±4,32, manevi gelişim 27,99±4,09, kişilerarası ilişkiler 25,47±4,47 stres yönetimide ise 20,08±4,60 olarak saptanmıştır. Sonuç olarak, akademik personelin sağlıklı yaşam biçimi davranışlarının orta düzeyde olduğu görülmüş, en yüksek puanı manevi gelişim, endüşük puanı fiziksel aktivite alt boyutundan aldıkları, sağlık sorumluluğu ve beslenme puan ortalamasının kadın katılımcılarda, fiziksel aktivite, beslenme, stres yönetimi alt boyutlarında ise 41-50 yaş aralığındaki katılımcılarda, manevi gelişim alt boyutunda da 51 ve üzerinde yaş aralığında olan katılımcılarda yüksek olduğu sonucuna ulaşılmıştır.The aim of the research was to reveal the healthy lifestyle behaviors of academic staff working at Niğde Ömer Halisdemir University and the factors affecting these behaviors. The population of the research consists of a total of 1078 people, 626 of whom are men and 452 of whom are women, working as academic staff at Niğde Ömer Halisdemir University. The population was accepted as the sample without selecting the sample, and 162 of them were women and 230 of them were men, who participated in the research voluntarily. A total of 392 academic staff were reached. The data was collected between July and December 2023, using a survey form containing individual characteristics consisting of 8 questions and 52 statements, to determine the characteristics of the participants such as gender, age, marital status, academic title, weekly course load, and the number of academic activities performed, by Walker et al. Developed by Bahar et al. It was collected with the healthy lifestyle behaviors scale-II, which was adapted into Turkish by . SPSS 25.0 program was used to evaluate the data. Shapiro and Kolmogorov-Smirnov tests were applied to determine whether the scores received by the academic staff from the Healthy Lifestyle Behavior Scale II showed a normal distribution. As a result of the tests, it was found that the data showed a normal distribution. Normally distributed scores; It was evaluated by independent sample t test and ANOVA test. The significance level was accepted as p<0.05. SYBD scale total score is 132.08±20.24, sub-dimension scale scores are; health responsibility 21.42±4.80, physical activity 16.16±4.65, nutrition 21.15±4.32, spiritual development 27.99±4.09, interpersonal relations 25.47±4.47 stress management was found to be 20.08±4.60. As a result, it was seen that the healthy lifestyle behaviors of the academic staff were at a medium level, the highest score was obtained from the spiritual development sub-dimension, the lowest score was from the physical activity sub-dimension, and the average score of health responsibility and nutrition was 41-50 in female participants, while the average score was 41-50 in the physical activity, nutrition and stress management sub-dimensions. It was concluded that the spiritual development sub-dimension was high in participants aged 51 and over
Evaluation of Tear Stability and Ocular Surface in Patients Undergoing External Endonasal Dacryocystorhinostomy (EE-DCR) for Primary Acquired Nasolacrimal Duct Occlusion (PANDO)
Get PDFThe aim of our study was to show the changes in ocular surface and tear film parameters of patients who underwent external endonasal dacryocystorhinostomy (EE-DCR). For this purpose, tear film break-up time, corneal staining score, ocular surface disease index (OSDI), and Schirmer I test were performed preoperatively and postoperatively. The data obtained were compared with healthy controls. In the preoperative period, ocular surface disease index scores and corneal staining scores were higher, and Schirmer 1 and tear film break-up time were lower in group 1 compared with group 2. The ocular surface parameters were similar between the groups in the first and third postoperative months. External endonasal dacryocystorhinostomy is an important method for the restoration of deteriorated tear stability. Restoration of these disorders may be an important determinant of patient satisfaction and visual quality after surgery
Assessing Vulnerability in Earthquake-Resistant Cities: A Multiple Regression Analysis for Sahinali, Nigde
Get PDFThe study aims to analyze the correlation between decisions on location, construction style, function, and building height in residential areas and an earthquake-resilient urban approach using multivariate linear regression analysis. The selected study area is Sahinali Neighborhood in the city center of Nigde, impacted by in the Kahramanmaras Earthquake Sequence (the 7.8 and 7.5 Mw earthquakes) in Turkey on February 6, 2023. Findings reveal that site selection is the most crucial factor influencing earthquake damage vulnerability, followed by building function, layout, and number of floors. The results emphasize that city-scale decisions made through zoning plans directly influence the development of an earthquake-resistant city. © 2024 The author
Synthesis of graphite/rGO-modified fungal hyphae for chromium (VI) bioremediation process
Get PDFBioremediation is a promising technology that can eliminate the drawbacks of conventional treatment methods in removing harmful toxic metals including chromium(VI). Therefore, in this study, fungal hyphae modified with graphite and reduced graphene oxide were synthesized and assessed for their potential to bioremediate heavy metals for the first time in the literature. The effects of the carbon-based materials on microbial structure were characterized using scanning electron microscopy analysis. Thermogravimetric, RAMAN, X-ray diffraction, and enzymatic analyzes were performed to determine the role of functional groups. In addition, batch adsorption experiments utilizing response surface methodology were conducted to optimize operating parameters such as time (1-11 h), chromium (10-50 mg/L), and graphite/reduced graphene oxide (0.1-1 g/L). The maximum adsorption capacity with the graphene fungal hyphae was determined to be 568 mg.g(-1), which is 9.7 times that of the crude fungal hyphae. The Cr(VI) removal for fungal hyphae-graphite and fungal hyphae-reduced graphene oxide biocomposites was 98.25% and 98.49%, respectively. The isothermal and kinetic results perfectly matched the 2nd order pseudo-model and Langmuir model in terms of the nature of the adsorption process. The laboratory scale test results indicate that fungal hyphae modified with graphite and reduced graphene oxide have a high adsorption capacity, suitable for the removal of chromium (VI) from wastewater.Scientific and Technological Research Council of Turkey (TUBITAK) [120Y087]; Nide omer Halisdemir University Scientific Research Projects Coordination Unit [MMT2020/2 BAGEP]This work was funded by The Scientific and Technological Research Council of Turkey (TUBITAK), Project No: 120Y087. As well, this study was derived by the Master of Science thesis of 'Formation and Determination of Characteristics The Graphite/Graphene Hyphae Structures With Mold Fungi' from Nide omer Halisdemir University. And this research has been supported by Nide omer Halisdemir University Scientific Research Projects Coordination Unit. Project Number: MMT2020/2 BAGEP, 2020-2021
Buffer ve Network Analiz Teknikleri Kullanılarak Kentsel Aktif Yeşil Alanlar için Mekânsal Yeterlilik ve Erişilebilirlik Analizi Spatial Adequacy and Accessibility Analysis for Urban Green Spaces Using Buffer and Network Analysis Techniques
Get PDFÜlkemizde özellikle son yıllarda sanayileşmenin ve hızlı nüfus artışının getirisi olarak artan çevre kirlilikleri, geçen yıl yaşanan yangın ve bu yıl devam eden deprem ve sel felaketleri gibi doğal afetlerin hızlı artışı, Covid-19 gibi salgın hastalıkların sönümlenmeden devam etmesi durumu sebebiyle sürdürülebilir kentlere olan ihtiyaç giderek daha ciddi bir boyuta ulaştığı gözlemlenmektedir. Sürdürülebilir kentlerin tasarlanmasındaki kritik fenomenlerden birisi de kentsel aktif yeşil alanların mevcudiyeti ve mekânsal olarak tasarlanmasıdır. Arazi kullanımında yapılan halihazırdaki yanlış planlamalar, özellikle sürekli yapılaşma faaliyetleri, kentsel yeşil alanların mevcudiyeti ve yeterliliğini giderek azalttığı gözlemlenmektedir. Bu çalışmada, Niğde kent merkezi örneğinde aktif yeşil alan olarak tanımlanan Çocuk Oyun Alanları (ÇOA), Semt/Mahalle Park Alanları (SPA) ve Spor Alanları (SA) için mekânsal yeterlilik ve erişilebilirlik analizleri gerçekleştirilmiştir. Bu analizler için 14.06.2014 tarih, 29030 sayılı Resmi Gazetede yayımlanan Mekânsal Planlar Yapım Yönetmeliğindeki kriterler esas alınmıştır. Mekânsal yeterlilik analizi sonucunda Niğde kent merkezinde bulunan 26 adet mahalle içerisindeki 24 adet mahallenin aktif yeşil alanların yetersiz düzeyde olduğu sadece 2 adet mahallenin yönetmelikteki standartlara uygunluk gösterdiği tespit edilmiştir. Yasal yönetmelikte yer alan kişi başı 10m2/kişi standardının yakalanmaması hazırlanan imar planlarının aktif yeşil alanlar üzerindeki planlamaların yetersizliğini açığa çıkarmıştır. Çalışmada mekansal erişilebilirlik değerlendirmesi için Buffer ve Network analiz yöntemleri kullanılmış ve yöntemler birbiri ile karşılaştırılmıştır. Yöntem karşılaştırmasında ise Network analiz tekniğinin Buffer analiz tekniğine kıyasla çoklu girdi parametresi kullanılması sebebiyle daha kapsamlı ve gerçekçi sonuç ürün sunduğu tespit edilmiştir
IX.term Çoruh (Artvin) mps and their political activities
Get PDFSosyal Bilimler Enstitüsü, Tarih Ana Bilim Dalı1950 seçimleri Türkiye'de çok partili hayata geçişin başlangıcı olmuş ve bu süreç, Çoruh (Artvin) gibi bölgelerde siyasi ve sosyal yapılarda önemli değişikliklere neden olmuştur. Çoruh'un zorlu coğrafyası ve stratejik önemi, bölgenin kalkınma süreçlerinde belirleyici olmuştur. IX. Dönem Çoruh milletvekilleri, özellikle tarım, altyapı, sağlık ve eğitim alanlarında bölgesel gelişim için çeşitli yasama faaliyetlerinde bulunmuşlardır. Milletvekilleri, Mecit Bumin, Abbas Gigin, Mesut Güney, Ali Rıza Sağlar ve Zihni Ural öne çıkan isimler olup her biri ulusal ve yerel düzeyde önemli katkılarda bulunarak Çoruh'un sosyal ve ekonomik dönüşümünde etkili olmuşlardır. Bu çalışmalar, bölgenin genel kalkınma stratejilerine entegrasyonunu teşvik etmiş ve Çoruh'un Türkiye'nin modernleşme sürecindeki yerini sağlamlaştırmıştır.The 1950 elections marked the beginning of the transition to a multi-party system in Turkey, a process that led to significant changes in the political and social structures of regions like Çoruh (Artvin). The challenging geography and strategic importance of Çoruh have been decisive in shaping the region's development processes. The IX. Term deputies of Çoruh, notably in agriculture, infrastructure, health, and education, have engaged in various legislative activities to foster regional growth. Key figures such as Mecit Bumin, Abbas Gigin, Mesut Güney, Ali Rıza Sağlar, and Zihni Ural have each made significant contributions at both the national and local levels, effectively influencing Çoruh's social and economic transformation. Their efforts have encouraged the integration of the region into broader development strategies and solidified Çoruh's place in Turkey's modernization process
The importance of coordination in preventing overdiagnosis: a retrospective analysis of unabsorbed oxidized regenerated cellulose
Get PDFBackgroundOxidized regenerated cellulose (ORC) is commonly used to control small intraoperative bleedings in lung cancer surgery. However, difficulties in its absorption may lead to complications that can mimic malignancy recurrence in the affected areas, and may require further examination.MethodsBetween 2015 and 2022, patients who underwent malignant tumour resection and lymph node dissection and were subsequently evaluated for suspected lymph node recurrence and underwent EBUS-guided needle biopsy were included in the study. Pathology reports of these patients showed an ORC-related foreign body type granulomatous reaction. Such reactions, caused by delayed absorption of ORC, can mimic malignancy recurrence and result in unnecessary biopsies.ResultsIn a total of 13 patients (10 males), pathology was observed in 18 lymph node areas after malignant resection and lymph node dissection, and ORC was detected in subcarinal and inferior paratracheal lymph node areas in all patients. The average age of the patients was calculated as 63.1 years (range 51-74). The mean SUVmax value observed in these lymph node areas on PET/CT was 5.22 (range 0-14.36). Although the SUVmax value decreased as the time between surgery and EBUS increased, no statistically significant difference was observed (p = 0.100).ConclusionThe study suggests that in cases of suspected unexpected lymph node recurrence in postoperative follow-up of lung cancer, it is important for clinicians to communicate with the surgeon and re-evaluate the use of ORC by reviewing the operative notes. This may help in determining an appropriate further investigation strategy