Bartin University Institutional Repository
Not a member yet
12212 research outputs found
Sort by
A Comparative Study on Experimental and FEA-Based Simulation of Dry Sliding Wear Behavior of Boronized AISI 304 Stainless Steel at Elevated Temperatures
No full textIn this study, the influence of boronizing on the high-temperature wear behavior of AISI 304 was examined experimentally and with FEA simulation. Boronizing, conducted at 950 degrees C for 3 h using the powder-pack boronizing technique, showed an approximately 7-fold increase in hardness compared to untreated sample. Boride layer characterization was performed using XRD, SEM, and EDS line analyses. Wear tests were performed at ambient temperatures of 25, 250, and 500 degrees C. While the wear rates of the untreated sample increased dramatically with increasing temperature, those of the boronized samples were significantly limited. FEA simulation using the Johnson-Cook fracture model demonstrated a high degree of consistency with the experimental wear profiles and this alignment enables reliable wear predictions. The oxide layer formation was observed on the worn surface of boronized samples during the tests at elevated temperatures, resulting in less plastic deformation.TUBITAK (Turkish Scientific and Technological Research Council) [221M417]This study was supported by TUBITAK (Turkish Scientific and Technological Research Council) with project no. 221M417
Role of air-soil temperature in the leaf area index (LAI) course and role of height-diameter at breast height (DBH) in the maximum LAI during foliation of Platanus orientalis L. in an urban-rural greenway system
No full textRural greenway systems passing through woodlands to connect urban societies are valuable in terms of not only transportation but also roadside tree phenology and ecophysiology and associated recreation. Therefore, particularly during their foliation periods, monitoring and analyses of that phenological and ecophysiological course of the roadside trees will primarily indicate their gradual degree of closure and will determine their gradual degree of coverage on the road and the roadside. Hence, the leaf area index (LAI) is a significant and comprehensive canopy parameter which is referred to for those monitoring and analyses procedures. This gradual-closure indicator and coverage determinant parameter can further be used for detecting shading and recreation potential, as well as the safety level of those greenways. Major driving factors of the phenological and ecophysiological course can also be investigated by monitoring and assessing the development of and change in the mean LAI under the influence of the mean temperature, height and diameter at breast height (DBH) values. Therefore, for this study, in order to monitor and determine the development of and change in LAI, hemispherical photographs were taken beneath the tree canopies at 10 different points along part of a regionally well known greenway system, which involves alleys of Platanus orientalis L. (oriental plane) trees. This point-based hemispherical photographing procedure was applied and repeated 20 times, particularly during the foliation period between mid-March and late June, when a total of 200 photographs were obtained and analysed using a digital image processing method. The seasonal course of the LAI values was graphed for each point, and principally the daily mean LAI (ranging between 0.35 and 2.76 m(2)m(-2)) was evaluated referring to both the air and the soil (-10 cm) temperature data. The point-based maximum LAI values (average 2.76 m(2)m(-2), ranging between 2.42 and 3.16) were achieved during mid-June. They were examined comparing their ranking with the rankings of the basic physiological parameters: mean height (ranging between 17.0 and 26.7 m) and mean DBH (ranging between 26.5 and 38.2 cm) and number of trees (5 to 15) within the canopy frames of the relevant points. Afterwards, the phenologically based and daily mean LAI values were discussed dependent upon their high and significant correlation, particularly with the soil temperature data (r = 0.89, P < 0.01), and the point-based maximum LAI values were also discussed dependent upon their non-correlation with the point-based mean height and mean DBH. In conclusion, the overall results of this study primarily emphasize the influence of the soil temperature on the phenological course of oriental plane canopies and on the development of their daily mean LAI, particularly during their foliation period. This current effect of the soil temperature indicates the potential alarm triggered by the early budburst dates and associated possible advance of the tree foliation period, depending on the warming capacity of the road asphalt and roadside pavement on the soil underneath, particularly during and after new-pavement and resurfacing practices.Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK, the Scientific and Technological Research Council of Turkiye) [2209-A-1919B012223881]; TUBITAKPart of this study was supported by Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK, the Scientific and Technological Research Council of Turkiye) via grant number 2209-A-1919B012223881. One of the authors, Ridvan Koruyan, received that research support from TUBITAK
Zooming Into Negotiation: Task-Based Interaction In An Online Synchronous EFL Setting
No full textBu çalışma, Yabancı Dil olarak İngilizce (EFL) öğrenenler arasında üç tür çevrimiçi eşzamanlı görev (yapboz, karar verme ve problem çözme) sırasında ortaya çıkan anlam uzlaşması (NoM) rutinlerini araştırmaktadır. Görev Temelli Dil Öğretimi (TBLT) ve etkileşimci İkinci Dil Edinimi (SLA) teorilerine dayanan araştırma, 32 orta düzey üniversite öğrencisinin katıldığı 13 saatlik transkript edilmiş sözlü öğrenci etkileşiminin nitel söylem analizine dayanmaktadır. Üç görev türünde toplam 225 müzakere rutini tespit edilmiştir. Yapboz görevi en fazla sayıda rutin üretirken (n = 79), bunu karar verme (n = 74) ve problem çözme (n = 72) takip etmiştir. Açıklama talepleri tüm görevlerde en sık görülen talepler olsa da, her görev farklı bir örüntü ortaya çıkarmıştır: yapboz görevleri sık sık bilgi ile ilgili açıklama talepleri ve onay kontrolleri üretmiştir; karar verme görevleri prosedürel anlama kontrolleri ve koordinasyona dayalı kontroller istemiştir; ve problem çözme görevleri, soyut ve duygusal olarak karmaşık içeriklerini yansıtan daha derin kavramsal onarımlara ve açıklama bölümlerine yol açmıştır. Bulgular, görev türü ve karmaşıklığının uzlaşma rutinlerinin hem miktarını hem de kalitesini önemli ölçüde etkilediğini ve bilişsel görev karmaşıklığı teorisi ile etkileşimci SLA'nın iddialarını desteklediğini göstermektedir. Çalışma ayrıca, çevrimiçi eşzamanlı görevlerin anlamlı öğrenci etkileşimini, dille ilgili bölümleri ve işbirliğine dayalı problem çözmeyi teşvik etme potansiyelini vurgulamaktadır. Pedagojik çıkarımlar ve dijital aracılı TBLT ortamlarında gelecekteki araştırmalar için öneriler tartışılmaktadır.This study investigates the patterns of negotiation of meaning (NoM) routines that emerge during three types of online synchronous tasks—jigsaw, decision-making, and problem-solving—among learners of English as a Foreign Language (EFL). Grounded in Task-Based Language Teaching (TBLT) and interactionist theories of Second Language Acquisition (SLA), the research draws on a qualitative discourse analysis of 13 hours of transcribed spoken learner interaction involving 32 intermediate-level university students. A total of 225 negotiation routines were identified across the three task types. The jigsaw task produced the highest number of routines (n = 79), followed by decision-making (n = 74) and problem-solving (n = 72). While clarification requests were the most frequent across all tasks, each task elicited a distinct pattern: jigsaw tasks generated frequent information-related clarification requests and confirmation checks; decision-making tasks prompted procedural comprehension checks and coordination-based checks; and problem-solving tasks led to deeper conceptual repairs and clarification episodes, reflecting their abstract and emotionally complex content. The findings suggest that task type and complexity significantly influence both the quantity and quality of negotiation routines, supporting claims from cognitive task complexity theory and interactionist SLA. The study also highlights the potential of online synchronous tasks to foster meaningful learner interaction, language-related episodes, and collaborative problem-solving. Pedagogical implications and suggestions for future research in digitally mediated TBLT environments are discussed
Examining the relationship between digital game addiction and physical activity in secondary school students
No full textBu araştırma; ortaokul öğrencilerinin dijital oyun bağımlılığı ile fiziksel aktiviteleri arasındaki ilişkiyi incelemek için yapılmıştır. Araştırmada nicel ilişkisel tarama yöntemi kullanılmış olunup, araştırma Bartın şehrinde bulunan Cumhuriyet, Gazi, Fatih ve Borsa Ortaokullarında eğitim gören 522 ortaokul öğrencisinin katılımı ile yürütülmüştür. Araştırmanın amacı doğrultusunda veri toplamak için öğrencilere "Demografik Bilgi Formu", "Dijital Oyun Bağımlılığı Ölçeği" ve "Bilişsel Davranışçı Fiziksel Aktivite Ölçeği" uygulanmıştır. Araştırmada elde edilen veriler SPSS 21.0 programı kullanılarak analiz edilmiştir. Araştırma verilerinin öncelikle normal dağılım gösterip göstermediğine ilişkin analizler yapılmıştır. Yapılan Kolmogorov-Smirrov testi sonucunda verilerin normal dağılım göstermediği belirlenmiştir (Dijital Oyun Bağımlılığı Ölçeği Kolmogorov-Smirrov = .000; sd=521; p<.05. Bilişsel Davranışçı Fiziksel Aktivite Ölçeği Kolmogorov-Smirrov = .000; sd=521; p<.05.). Verilerin normal dağılım sergilememesi nedeniyle, analizlerde iki kategorili bağımsız değişkenler için non-parametrik yöntemlerden Mann Whitney U Testi, üç veya daha fazla kategorili değişkenler için ise Kruskal Wallis H Testi uygulanmıştır. Karşılaştırmalar sonucunda anlamlı bir fark tespit edildiğinde, farkın kaynağını belirlemek amacıyla Mann Whitney U Testi ve Bonferroni düzeltmesi kullanılmıştır. Ayrıca, araştırma kapsamında elde edilen veriler betimsel istatistikler ve Spearman Sıra Farkları Korelasyonu kullanılarak korelasyon analiziyle de değerlendirilmiştir. Analiz sonuçlarına göre, öğrencilerin dijital oyun bağımlılığı düzeyleri ile cinsiyet, boy uzunluğu, sınıf düzeyi, dijital oyun oynama süresi ve bir gün içinde fiziksel aktivite için harcanan süre değişkenleri arasında anlamlı bir farklılık olduğu tespit edilmiştir. Bunun yanında; öğrencilerin fiziksel aktivite düzeyleri ile cinsiyet, boy uzunluğu, kilo, sınıf düzeyi, anne eğitim düzeyi, baba eğitim düzeyi, dijital oyun oynama süresi ve bir gün içinde fiziksel aktivite için harcanan süre değişkenleri arasında anlamlı bir farklılık olduğu belirlenmiştir. Ortaokul öğrencilerinde dijital oyun bağımlılığının fiziksel aktivite düzeyini negatif anlamda etkilediği sonucuna ulaşılmış ve fiziksel aktivite programlarının uygulanmasının önemi vurgulanmıştır.This study was conducted to examine the relationship between digital game addiction and physical activity among secondary school students. The research utilized a quantitative relational survey method and was carried out with the participation of 522 secondary school students studying at Cumhuriyet, Gazi, Fatih, and Borsa Middle Schools in Bartın, Turkey. To collect data for the study, the "Demographic Information Form", "Digital Game Addiction Scale", and "Cognitive Behavioral Physical Activity Scale" were administered to the students. The data obtained in the research were analyzed using the SPSS 21.0 software. Initially, analyses were performed to determine whether the data showed a normal distribution. The Kolmogorov-Smirnov test indicated that the data did not exhibit a normal distribution (Digital Game Addiction Scale Kolmogorov-Smirnov = .000; df = 521; p < .05; Cognitive Behavioral Physical Activity Scale Kolmogorov-Smirnov = .000; df = 521; p < .05). Since the data did not exhibit a normal distribution, non-parametric methods were employed in the analyses: the Mann-Whitney U Test for two-category independent variables and the Kruskal-Wallis H Test for variables with three or more categories. When a significant difference was identified following comparisons, the source of the difference was determined using the Mann-Whitney U Test with Bonferroni correction. Additionally, the data obtained in the study were analyzed using descriptive statistics and correlation analysis (Spearman's Rank-Order Correlation). The analysis results showed significant differences between students' levels of digital game addiction and variables such as gender, height, grade level, digital game playing time, and the daily duration spent on physical activity. Furthermore, significant differences were determined between students' physical activity levels and variables such as gender, height, weight, grade level, mother's education level, father's education level, digital game playing time, and the daily duration spent on physical activity. It was concluded that dijital game addiction negatively affects the physical activitiy level of secondary school students and the importance of implementing physical activity programs was emphasized
Life Satisfaction as Mediator Between Social Integration and Parental Perception in Schizophrenia and Bipolar Disorder: Implications for Social Work Intervention
No full textThe present study examines relationships between social integration, life satisfaction, and perception of being a parent among individuals with schizophrenia or bipolar disorder, investigating life satisfaction's mediating role between social integration and perception of being a parent. The research is grounded in ecological systems theory. Using structural equation modeling and group comparisons, the research analyzed data from 382 outpatients (schizophrenia: n = 216; bipolar disorder: n = 166) receiving services in Community Mental Health Centers in Istanbul, T & uuml;rkiye. Results demonstrate that social integration significantly and positively predicts both life satisfaction and perception of being a parent. Moreover, life satisfaction positively predicts perception of being a parent, partially mediating the relationship between social integration and parental role perception. Although individuals with bipolar disorder reported higher levels of social integration and life satisfaction than those with schizophrenia, no significant differences were found in perception of being a parent, and the mediational pathway remained consistent across both diagnostic groups. These findings contribute to the limited literature on parenthood experiences among individuals with serious mental illness by applying an ecological framework to this marginalized population. Future research should employ longitudinal designs and explore culturally diverse contexts to further clarify these relationships and strengthen implications for social work interventions
A Boubaker Collocation Method to Solve the Single Degree of Freedom System
No full textIn many mechanical vibration situations, a complex system can be idealized as a single degree of freedom spring-mass system (Kurt and Cevik, Mech Res Commun 35(8):530–536, 2008) . This research offers a new and straightforward method for single degree of freedom system in terms of Boubaker polynomials. On the basis of this method, the solution of the problem is approximated by truncated Boubaker series (Yalçınbaş and Akkaya, Ain Shams Eng J 3(2):153–161, 2012) . The assumed solution and its derivatives are written in the matrix form and then they are substituted in the equation. By utilizing the collocation points, the equation is transformed into a system of linear algebraic equations. This system is expressed in the matrix form. Finally, a new system is obtained by using this last system and the conditions. The solution of this system determines coefficients of the assumed solution. The effectiveness of the method is mentioned as a result of comparing the obtained results with the exact solution. © 2025 Elsevier B.V., All rights reserved
Evidence-based nursing practices in children suffering from asthma
No full textAsthma is a chronic disease that affects millions of children worldwide. Despite improving nursing care, the prevalence of childhood asthma continues to rise. Asthma can have a negative impact on the quality of life. Children who have been diagnosed with asthma can experience physical, psychological, and social problems. Recurrent and uncontrolled asthma attacks in children can be a cause of breathlessness, activity limitation, school absenteeism, and less participation in school activities. These problems can cause the child to experience feelings such as fear of rejection, low self-esteem, feelings of inadequacy, helplessness, and depression. The Global Initiative for Asthma (GINA) guidelines support the implementation of nursing interventions to manage childhood asthma. These interventions support and guide children's efforts to manage their asthma. Therefore, the primary focus of nurses should be on the provision of preventive care rather than on the care of children with asthma exacerbation. Nurses and health professionals aim to ensure that children's asthma is controlled, with fewer symptoms, no problems sleeping, and no restrictions on exercise. Additionally, the maintenance of normal lung function and the prevention of side effects related to medical conditions should be among their main goals. Knowledge of evidence-based practices is essential for this purpose. This section discusses evidence-based practices for children with asthma, which are presented under four headings: (1) evaluating asthma, (2) education in asthma care, (3) controlling environmental factors and co-morbidities, and (4) pharmacological treatment. © 2025 Elsevier B.V., All rights reserved
3D Modeling of A Novel Curved Submerged Vane With Variable Profile for the Protection of Meandering River Beds
No full textDue to scour problems caused by flooding or high and turbulent flow in the riverbed, river regulation structures are important on the outer meander. Submerged vanes are a new method for meandering open channels and river regulation. In this study, initially, using a flow discharge of 20 L/s, the numerical results of the no-vane (V0) and three-array with six submerged vanes (V1) in meandering open channel flows have been calibrated with experimental results. Then, the submerged vane cases with no angle (CV1) and 20 degrees angle (CV2-CV3) were investigated numerically. In the presented numerical models, continuity, momentum, and turbulence model equations were used. The k-epsilon model was used for turbulence viscosity. The results of the numerical model were compared with the experimental model results. Additionally, flow velocities and depth were analyzed using numerical models. In the outer meander, the three-array with curved vane structures (CV1, CV2 and CV3) affected the flow velocity by 77%-92% in the region behind the vane. The flow velocities were investigated along with depth using the numerical modeling and found that the mean velocity was reduced by 54%-83% along the depth. As an effective method of reducing flow velocities and directing flows, it is also recommended that submerged vane structures be used
L2 Learning Effort of Students Majoring in English Language and Literature
No full textBu çalışma, İngiliz Dili ve Edebiyatı bölümü öğrencilerinin yabancı dil öğrenme çabalarını araştırmayı amaçlamaktadır. Betimsel tarama deseninde gerçekleştirilen araştırmaya toplam 150 lisans öğrencisi katılmıştır. Araştırma betimsel tarama deseninde tasarlanmış ve toplam 150 öğrenciye uygulanmıştır. Araştırmaya katılan öğrencilerin yabancı dil öğrenme çabasını ölçmek için Yabancı Dil Öğrenme Çabası Ölçeği kullanılmıştır. Araştırma verilerinin analizi ölçek ve alt ölçekler için popülasyon dağılımının normalliği göz önünde bulundurularak parametrik ve parametrik olmayan testler ile gerçekleştirilmiştir. Veriler doğrultusunda, öğrencilerin dil öğrenme çabasını sıklıkla gösterdiği ve prosedürel çabanın en yüksek düzeyde gösterilen çaba olduğu sonucuna ulaşılmıştır. Belirlenen öğrenci özelliklerinin çaba üzerindeki etkisine bakıldığında, yaş ve algılanan yabancı dil düzeyinin anlamlı bir etkisi görülmezken cinsiyet ve eğitim yılı değişkenlerine göre öğrenci cevaplarında anlamlı farklılaşma olduğu tespit edilmiştir. Kız öğrencilerin çaba düzeyi erkek öğrencilere oranla daha yüksek bulunmuş; gösterilen dil öğrenme çabasının eğitim yılı ilerledikçe düştüğü, yalnızca son sınıf öğrencilerinin tüm öğrenci grupları arasında en yüksek çaba düzeyine sahip sınıf olduğu belirlenmiştir. Sonuçlar tartışılarak öneriler sunulmuştur
Öğretmen Adaylarının Sanatçı ve Bilim İnsanı Kavramlarına Yönelik Algılarının Karşılaştırmalı Olarak İncelenmesi: Disiplinler Arası Bir Bakış
No full textBu çalışmanın amacı, farklı bölümlerdeki öğretmen adaylarının “sanatçı ve bilim insanı” algısına yönelik algılarının karşılaştırmalı olarak incelenmesidir. Katılımcılar, 2023-2024 eğitim-öğretim yılında Bartın Üniversitesi’nde öğrenim görmekte olan 200 öğrenciden (n Türkçe Eğitimi = 40, n Sosyal Bilgiler Eğitimi = 40, n Matematik Eğitimi = 40, n Fen Bilgisi Eğitimi = 40, n Resim-İş Eğitimi = 40) oluşmaktadır. Araştırmada nicel araştırma yöntemlerinden tarama modeli kullanılmıştır. Araştırmadan elde edilen veriler, içerik analizi kullanılarak incelenmiştir. Araştırmadan elde edilen bulgulara göre, Fen, Sosyal Bilgiler, Matematik ve Resim-İş Eğitimi bölümlerinde öğrenim görmekte olan öğretmen adaylarının sanatçı ve bilim insanı kavramlarına yönelik algıları arasında anlamlı farklılıklar olduğu görülmektedir. Öğretmen adaylarının çizimleri incelendiğinde, bilim insanını genellikle laboratuvarda, laboratuvar önlüğü giyerek deney ya da buluş yapan, erkek, dağınık saçlı, erkek çizimler yaptıkları; sanatçıyı elinde boyalarla tabloya resim çizen, saçsız, yüz ifadesi belirsiz, net bir kıyafetle özdeşmeyen çizimler yaptıkları görülmektedir