Zonguldak Bülent Ecevit University Institutional Repository
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In situ synthesis of MIL-125 on cinnamon stick and improved via carboxymethyl cellulose: A sustainable approach for super-high crystal violet adsorption
No full textIn the current study, a biowaste cinnamon stick (CS) was used as an adsorbent and modified via in-situ techniques with titanium-based metal organic framework (MIL-125@CS) and carboxymethyl cellulose (CMC/MIL-125@CS). The prepared samples were characterized by various techniques, then utilized for toxic crystal violet (CV) dye removal. CV adsorption was examined for the effects of adsorbent dosage, solution pH, contact time, initial concentration, temperature and anion/cation/natural organic material (NOM). CV removal rate remarkably decreased at low pHs due to the degradation of CV and wavelength shift in the strongly acidic region. The kinetic and isotherm results showed that CMC/MIL-125@CS reached equilibrium much faster (30 min) and much higher adsorption capacity (6750.58 mg/g) than CS and MIL-125@CS. Furthermore, the samples were efficiently regenerated and reusable over five cycles, demonstrating significant adsorption rates. Functional material design approaches yielded superior CV adsorption performance
Kazaklarda Alaş Hareketi ve Ötebay Turmanjanov’un Üslubuna Yansımaları
No full text19. yüzyılda Kazak topraklarının Ruslar tarafından işgaliyle birlikte bu coğrafyada sosyal, kültürel, siyasi birçok gelişmeler kendini gösterir. Rusların sömürgeci, yayılmacı siyasetleri, halkın haksızlıklara başkaldırmasıyla ve bölgenin aydınlanmasıyla sonuçlanır. 19. yüzyılın sonlarına doğru gerek Rus etkisi ve gerek Usul-i Cedit eğitim ve kültür hareketinin etkisiyle bölgede aydın bir sınıf oluşur. Bu aydınlar Alaş Orda aydınları olarak anılırlar. Alaş Orda hareketi hem siyasi hem edebî bir harekettir. Bu aydınlar görüşlerini edebiyat üzerinden halka duyurmaya çalışırlar. Alaş Orda hareketi sadece Kazak coğrafyasında değil Türkistan’ın farklı coğrafyalarında da etkili olmuştur. Bu güçlü aydınlanma hareketi, Stalin’in baskı döneminde ortadan kaldırılmaya, silinmeye çalışılmış, bu hareketi benimsemiş entelektüeller tasfiye edilmiştir. Alaş Orda’nın yenilikçi fikirlerini benimseyen aydınlar, tutuklamalar, sürgünler ve ölüm cezaları ile susturulmuş, ortadan kaldırılmışlardır. 1938 yılında “Abaycılık, Mağcancılık” suçlamasıyla sürgüne gönderilen aydınlardan biri de Ötebay Turmanjanov’dur. Mağcan bilindiği üzere Alaş Orda hareketinin öncü isimlerinden biridir. Stalin döneminde çok sesliliğe ve çok renkliliğe izin verilmemekte, edebiyat merkezden gelen emirler doğrultusunda şekillenmektedir. Ötebay Turmanjanov’un da kendine has üslubu bu dönemde dikkat çekmiş, hoş karşılanmayarak hedef gösterilmiştir. 20 yıl süren sürgün cezası ancak Stalin’in ölümünden sonra 1958 yılında adının temize çıkmasıyla beraber kalkmıştır. Bu çalışmada Ötebay Turmanjanov’u çağdaşlarından ayıran kendine özgü üslubu, eserlerinden örneklerle ortaya konulmaya çalışılmıştır.</jats:p
An Examination of the Emissions, Cost, and Time of Intermodal Transportation
No full textDeciding on appropriate transport modes is critical in terms of emissions, time, and cost. However, transport routes do not always allow for the selection of the most cost-effective and environmentally friendly modes of transport. Therefore, various modes of transportation must be used together to overcome these constraints. This study investigates the use of a combination of different transportation modes in container transport from Filyos in Turkey to Vienna. Constanța has been selected as the trans-shipment port on the transport route, and three distinct modes of transport have been used from Constanța to Vienna, including road, rail, and riverway. As a result of this study, the fuel consumption, CO2 emissions, time, and cost for each intermodal transport type were evaluated comparatively. Although seaway transportation is advantageous in terms of emissions, cost, and fuel consumption, it is determined that road transport is more beneficial in terms of time. The maximum and minimum CO2 emissions were calculated to be 2,107,124 tonnes and 365.6 tonnes for roadway and seaway transportation, respectively.</jats:p
Ortaokul Öğrencilerinin Eleştirel Okuma Öz-Yeterlik Düzeylerinin Çeşitli Değişkenlere Göre İncelenmesi
No full textBu araştırma, ortaokul öğrencilerinin eleştirel okuma öz-yeterlik düzeylerini belirlemeyi ve bu düzeylerin çeşitli değişkenlere göre nasıl farklılık gösterdiğini incelemeyi amaçlamaktadır. Araştırma, betimsel tarama yöntemi kullanılarak Ankara ilindeki üç farklı ortaokulda öğrenim gören 5., 6., 7. ve 8. sınıf öğrencilerinden oluşan 490 kişilik bir örneklem üzerinde gerçekleştirilmiştir. Veriler, Ortaokul Öğrencilerine Yönelik Eleştirel Okuma Öz-Yeterlik Ölçeği kullanılarak elde edilmiştir. Verilerin normal dağılım göstermemesi nedeniyle, veri analizlerinde non-parametrik testlerden Kruskal-Wallis ve Mann-Whitney U testleri kullanılmıştır. Bulgular, öğrencilerin genel eleştirel okuma öz-yeterlik düzeylerinin yüksek olduğunu, ancak analiz boyutunda diğer boyutlara göre daha yüksek puanlar aldıklarını ortaya koymuştur. Sınıf düzeyi değişkeni incelendiğinde, 5. sınıf öğrencilerinin eleştirel okuma öz-yeterliklerinin 6., 7. ve 8. sınıflara göre anlamlı derecede yüksek olduğu tespit edilmiştir. Dijital oyun oynama süresi arttıkça eleştirel okuma öz-yeterlik düzeylerinin azaldığı görülmüş; ancak oyun oynanan aygıtın (cep telefonu, bilgisayar, tablet) bu düzeyler üzerinde anlamlı bir etkisi olmadığı belirlenmiştir. Ayrıca, aylık kitap okuma sayısının artmasının, öğrencilerin eleştirel okuma becerilerini olumlu yönde etkilediği sonucuna ulaşılmıştır. Araştırma bulgularına dayalı olarak öğrencilerin eleştirel okuma becerileri öz-yeterliklerini geliştirmek için okuma alışkanlıklarının teşvik edilmesi ve dijital oyun sürelerinin dengelenmesi önerilmektedir.</jats:p
Effects of the Amyotrophic Lateral Sclerosis-related Q108P Mutation on the Structural Ensemble Characteristics of CHCHD10
No full text Introduction: The Q108P pathological variant of the mitochondrial Coiled-Coil-Helix-- Coiled-Coil-Helix Domain-Containing Protein 10 (CHCHD10) has been implicated in amyotrophic lateral sclerosis (ALS). Both the wild-type and CHCHD10Q108P proteins exhibit intrinsically disordered regions, posing challenges for structural studies with conventional experimental tools. Methods: This study presents the foundational characterization of the structural features of CHCHD10Q108P and compares them with those of the wild-type counterpart. We conducted multiple run molecular dynamics simulations and bioinformatics analyses. Results: Our findings reveal distinct differences in structural properties, free energy surfaces, and the outputs of principal component analysis between these two proteins. These results contribute significantly to the comprehension of CHCHD10 and its Q108P variant in terms of pathology, biochemistry, and structural biology. Conclusion: The reported structural properties hold promise for informing the development of more effective treatments for ALS. </jats:sec
The Serial Mediator Role of Mindfulness, Difficulty İn Emotion Regulation and Mental Well-Being Between Self-Hatred and Entrapment
No full textHuman life is extremely valuable in any circumstance. In this regard, both physical and mental health are crucial. The way in which an individual perceives himself and the circumstances he finds himself in can provide insight into his mental well-being. A person’s life may be complicated by elements such as self-hatred, entrapment, and an inability to control one’s emotions. Nevertheless, cultivating mindfulness and attaining a state of elevated well-being serve as favorable prognostic factors for an individual’s psychological health. In the present study, an investigation was conducted into the associations between the concepts of self-hatred and entrapment and mental well-being, difficulties in emotion regulation, and mindfulness. For the first time, the relationships between these variables were analyzed. The study included 346 university students, 216 of whom were female and 76 of whom were male. In order to analyze the mediation dimension, structural equation modeling (SEM) was implemented. The results of the study indicated that mental health, difficulty regulating emotions, and mindfulness all played a partial mediating role between self-hatred and entrapment. There is a potential for individuals who despise themselves to possess mindfulness yet struggle with emotion regulation and mental health issues, which could contribute to a sense of confinement.</jats:p
Prussian‐Blue Catalysis and NFC Synergy: a Battery‐Free Laser‐Induced Graphene‐Based Platform for Urine Glucose Monitoring at Point‐of‐Care
No full textPlay-based training program for overcoming hospital fear in children
No full textWhether or not they have had medical procedures in hospitals before, children experience fear of medical procedures performed in hospitals or in general. These children need to be given information about the medical procedures or general procedures performed in the hospital in an effective way through different methods. One of these methods is play. This study aims to determine the effect of play-based training program on the fear of medical procedures in healthy children aged 7-12 years.The research was conducted in an intervention with the control group. The study was conducted with 120 children who met the inclusion criteria in two different primary and secondary schools in Türkiye. Training was given to 60 children in the intervention group for four weeks. Data were collected from both groups using the Medical Procedures Fear Scale at three different stages: pre-training, post-training, and follow-up. Analyses were performed using the SPSS 25 program.It was observed that the control group's post-test and follow-up test medical procedure fear score was greater than that of the intervention group (p < 0.05). Intervention group's post-test and follow-up test medical procedure fear score was more significant than the pre-test (p < 0.05).Play-based hospital fear overcoming training is a method that reduces the fear of medical procedures in healthy children aged 7-12 years. It may benefit children if these training practices are carried out in schools with the co-operation of healthcare professionals.Play-based training programs can be implemented in various healthcare settings to reduce children's fear of medical procedures and improve their overall well-being through collaboration among healthcare professionals and community organizations
Effect of process parameters on the weld quality of <scp>3D</scp> printed <scp>PLA</scp>‐<scp>CF</scp> sheets by <scp>FSW</scp> process
No full textAbstractFriction stir welding (FSW) process is commonly used in the joining of similar/dissimilar materials. FSW involves process parameters that can affect the weld quality. To enhance this, it is important to accurately determine the process parameters. In this study, the weldability of 3D printed carbon fiber‐reinforced polylactic acid (PLA‐CF) sheets has been investigated using FSW. The process was carried out with three different tool pin geometries (triangle, square, and screw), feed rates (20, 40, and 60 mm/min) and tool rotational speeds (1250, 1750, and 2250 rpm). Tensile tests were conducted and hardness measurements were taken to discuss the effects of process parameters on weld quality. Temperature values were measured to examine the impact of tool pin geometry on the heat generation during welding. Finally, visual and microstructure examinations were conducted in the weld zone to assess the changes in weld strength. As a result, it has been determined that weld strength is significantly influenced by the process parameters. Accordingly, the best weld quality was achieved with triangular pin profile at a traverse speed of 40 mm/min and a rotation speed of 1250 rpm (UTS: 43.6 MPa, efficiency 79.6%), while for square pin (UTS: 49.2 MPa, efficiency 89.8%) and screw pin (UTS: 44.9 MPa, efficiency 81.9%) geometries, the optimal values are 20 mm/min and 2250 rpm. The distribution of CF reinforcement is uniform in high weld strength samples, while with lower weld quality samples, the distribution is irregular. This indicates that the reinforcement of CF has significant effect on weld strength.Highlights Investigate the weldability of 3D printed PLA‐CF plates through FSW process. Examines the impact of pin geometry, feed rates, and tool rotational speeds. Determine the welding strength and temperature generated during welding. Choice of the square pin geometry is more suitable for joining PLA‐CF plates. Visual and microstructure examinations were conducted in the weld zone. </jats:sec
Predicting Thermal Conductivity of Nanoparticle-Doped Cutting Fluid Oils Using Feedforward Artificial Neural Networks (FFANN)
No full textMachining processes often face challenges such as elevated temperatures and wear, which traditional cutting fluids are insufficient to address. As a result, solutions involving nanoparticle additives are being explored to enhance cooling and lubrication performance. This study investigates the effect of thermal conductivity, an important property influenced by the densities of mono and hybrid nanofluids. To this end, various nanofluids were prepared by incorporating hexagonal boron nitride (hBN), zinc oxide (ZnO), multi-walled carbon nanotubes (MWCNTs), titanium dioxide (TiO2), and aluminum oxide (Al2O3) nanoparticles into sunflower oil as the base fluid. Hybrid nanofluids were created by combining two nanoparticles, including ZnO + MWCNT, hBN + MWCNT, hBN + ZnO, hBN + TiO2, hBN + Al2O3, and TiO2 + Al2O3. A dataset consisting of 180 data points was generated by measuring the thermal conductivity and density of the prepared nanofluids at various temperatures (30–70 °C) in a laboratory setting. Conducting thermal conductivity measurements across different temperature ranges presents significant challenges, requiring considerable time and resources, and often resulting in high costs and potential inaccuracies. To address these issues, a feedforward artificial neural network (FFANN) method was proposed to predict thermal conductivity. Our multilayer FFANN model takes as input the temperature of the experimental environment where the measurement is made, the measured thermal conductivity of the relevant nanoparticle, and the relative density of the nanoparticle. The FFANN model predicts the thermal conductivity value linearly as output. The model demonstrated high predictive accuracy, with a reliability of R = 0.99628 and a coefficient of determination (R2) of 0.9999. The average mean absolute error (MAE) for all hybrid nanofluids was 0.001, and the mean squared error (MSE) was 1.76 × 10−6. The proposed FFANN model provides a State-of-the-Art approach for predicting thermal conductivity, offering valuable insights into selecting optimal hybrid nanofluids based on thermal conductivity values and nanoparticle density.</jats:p