Karamanoğlu Mehmetbey University
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İnvestigation of photocatalytic and photoluminescent properties of a novel multifunctional near-uv excited nanostucture ceo2:0.1dy0.1ho
Get PDFIn this study, Dy3+ doped and Ho3+ co-doped materials synthesized by the sol-gel method at different temperatures were investigated. The structural and optical properties were characterized by an x-ray powder diffract meter, thermal analysis system, scanning electron microscopy, Raman spectroscopy, FT-IR, UV-vis spectroscopy, and photoluminescence spectrophotometer. The photocatalytic performance, crucially contingent on the sintering temperature, was systematically evaluated using malachite green and methylene blue as model pollutants. Remarkably, the highest efficiency, registering an impressive 90%, was achieved for methylene blue when sintered at 1000 degrees C. For malachite green, a substantial efficiency of 62% was attained at a sintering temperature of 800 degrees C. The corresponding optical band gap, a pivotal parameter influencing photocatalytic activity, was determined to be 2.43 eV. Under the near-UV excitation at 318 nm, the CeO2:0.1Dy0.1Ho phosphor emitted photoluminescence with dominating emissions at 475 nm (blue), 559 nm (green) and 663 nm (red) corresponding to F-4(9/2)-> H-6(15/2) (blue) transition of Dy3+ ions, (F4,S2)-F-5-S-5 -> I-5(8) (green) and F-5(5)-> I-5(8) (red) transitions of Ho3+ ions, respectively
Synthesis, characterization, and investigation of photoluminescence optima of In3+ and Gd3+ doped Eu1.90In0.10Ru2O7 and Eu1.90Gd0.10Ru2O7 materials
No full textIn this study, we investigated the photoluminescence properties and structure of the In3+ and Gd3+ doped Eu2Ru2O7-based pyrochlore materials. The samples were synthesized by solid state reaction technique, investigated structurally by X-ray powder diffraction (XRD), thermally by thermogravimetry, and differential thermal analysis, morphologically by scanning electron microscopy (SEM). The photoluminescence properties of Eu1.90In0.10Ru2O7 and Eu1.90Gd0.10Ru2O7 were investigated with photoluminescence spectrometer. X-ray diffraction patterns of all the samples showed that all samples had a cubic type pyrochlore crystal structure with a = b = c = 10.252 Å and ? = ? = ? = 90°. The XRD patterns demonstrate that neither the type nor the amount of doping ion alters the unit cell parameter. The SEM images of Eu1.90In0.10Ru2O7 and Eu1.90Gd0.10Ru2O7 reveal a regular morphology, with an average sample size ranging from 0.2 to 0.5 ?m. The elementel (EDX) analysis confirm the absence of impurity elements and showing that the theoretical and experimental element ratios are consistent with EDX analysis expectations. The pyrochlore phosphors showed broad red emission band at ?605 nm. This red emission can be attributed to the 5D0?7F2 transitions of Eu3+. The phosphor co-doped with In3+ ions has a considerably longer lifetime and photoluminescence intensity than the other phosphor. Eu1.90In0.10Ru2O7 and Eu1.90Gd0.10Ru2O7 phosphors, which show transitions in the red region (at 605/606 nm,5D0 ?7F2), are suitable for optoelectronic and white LED applications. © 2024 Taylor & Francis Group, LLC.Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK, (114Z438); Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTA
A LAMP-BEARER (?) IN THE FORM OF DIONYSUS FROM ANATOLIAN CIVILIZATIONS MUSEUM
No full textA rare and nearly life-size bronze statue of Dionysus is displayed in the Classical Artifacts section of the Museum of Anatolian Civilizations. The piece, whose origin of discovery is unknown, was broken into pieces and smuggled abroad. It was brought back to Turkey and reassembled by the Turkish Ministry of Culture and Tourism. Bronze statues in human form were frequently used in the houses of wealthy city dwellers in antiquity. Bronze is reused by melting, which has caused the present statue to become an increasingly rare artifact. This study aims to introduce the bronze sculpture of Dionysus, its possible date of creation, and its intended use by comparing it with similar examples from the Roman Empire. The study conducted thus far, indicates that the artifact may have been used as a lighting device These lighting devices were especially popular in the 1st century AD, and similar examples can be seen in Pompeii. The stylistic analysis indicates that the sculpture is pasticcio and contains elements from a wide range of time periods and dates to the 1st–2nd centuries AD. © 2024, Mega Publishing House. All rights reserved
Bor karbür: fizikokimyasal özellikleri, sentezi ve savunma teknolojileri alanında uygulamaları
No full textGelişmiş seramiklerin dahil edilmesi, askeri ve savunma teknolojilerinde yapılan ana değişikliklerden biriydi; bu sınıftaki malzemelerin yüksek sertliğini ve düşük ağırlığını metalik zırhların yerini alacak şekilde birleştirerek balistik zırhların yapımında yeni teknoloji geliştirildi. Araç ve vücut zırh sistemlerinde kullanılan malzemeler alümina, silisyum karbür ve bor karbürdür. Bu seramik malzemelerin her biri, balistik performans için önemli olan yüksek sertlik, düşük yoğunluk ve kırılma dayanıklılığı gibi özellikler sergiler. Bu çalışma, bor karbür bileşiğinin askeri ve savunma sektöründeki önemini ve uygulamalarda kullanımını özetler. Eşsiz fizikokimyasal özellikleriyle bilinen bu malzeme, ulusların askeri güçlerini ve savunma kabiliyetlerini güçlendirmede çok önemli bir rol oynamaktadır. Son araştırma eğilimlerinin, yararlarının ve potansiyel uygulamalarının anlaşılması, bu alanlarda daha fazla gelişmeye rehberlik edebilir. Daha etkili bir koruma ihtiyacı, silahlı çatışmaların gelişmesi ve koruma sistemlerine bakış açısının kaçınılmaz değişmesiyle ortaya çıktı
How Employee Productivity Mediates the Effect of Organizational Justice on Work Engagement in Türkiye
No full textThis article explores whether organizational justice has a significant effect on work engagement, and if so, whether employee productivity has a mediating role on this effect. It studies the case of Turkish information technology employees, with an online survey method used for data generation, with data analyzed by SmartPLS and structural equation modeling with the least squares method. Cronbach's Alpha and Compound Reliability values were used to test the reliability of the generated model. Average variance and factor loads were calculated to test convergent validity. Cross-factor loads were taken into account with the Fornell-Larcker criterion to assess differential validity. In this way, the study finds that organizational justice had a significant effect on work engagement and that productivity had a partial mediating role on this effect
Long-Duration Type 1 Diabetes Alters Bone Matrix Composition but Does Not Influence Microarchitecture or Mechanical Behavior in Femoral Trabecular Bone in Older Adults
No full textAnnual Meeting of the American-Society-for-Bone-and-Mineral-Research (ASBMR) -- SEP 27-30, 2024 -- Toronto, CANADA[Abstract Not Available]Amer Soc Bone & Mineral Re
The relationship between academic crafting, work-school facilitation and academic engagement: a mediated model
No full textThis research examines the relationship between academic crafting, work-school facilitation and academic engagement in higher education. Based on the Job Demands-Resources (JD-R) Model, the research sought to determine how students' alignment of academic activities with personal preferences and interests (academic crafting) affects academic engagement and whether work-school facilitation mediates this effect. The research therefore emphasized the delicate balance that students strike between their work obligations and their scholarly activities. Our research hypotheses focused on understanding how academic crafting directly and indirectly affects student engagement. The research data were obtained from a sample of students enrolled in postgraduate programs and actively working in the labor market. The sample included a higher proportion of male (108), married people (88), those aged 26 to 35 (89), students pursuing a master's degree with a thesis (112), and those who had been employed for 6-10 years (47). The analyses revealed that academic crafting has a direct positive effect on academic engagement. Moreover, in the research, academic crafting not only directly affected academic engagement, but also indirectly through work-school facilitation. In this case, it was determined that work-school facilitation had a mediating role in the study. Therefore, students who proactively aligned their course-related activities with their interests effectively balanced their work demands and academic responsibilities and exhibited more dedication and enthusiasm in their academic studies
Evaluation and optimization of red pine needle-reinforced roller-compacted concrete by bioinspired algorithms
No full textThis paper discusses the improvement of roller compacted concrete by the addition of red pine needle (PN) fibers optimized by bioinspired techniques. The purpose was to determine a perfect set of mechanical characteristics, such as flexural, compressive, and splitting tensile strengths, by determining proper correlations between the water-cement ratio, superplasticizer, and fiber volume. Based on the data obtained with the help of experiments, it was shown that optimizing the PN fibers added to RCC with nature-inspired algorithms (particle swarm optimization, genetic algorithms, simulated annealing and artificial neural networks) yields positive results in terms of improving a number of characteristics, including flexural strength, fracture toughness, and durability. In addition, adopting PN fibers has certain environmental benefits. All methods under analysis showed good results, with the artificial neural network (ANN) being superior in terms of predicting the parameters of RCC. The discussed research confirms the effectiveness of such optimization methods for determining the best proportions for RCC using PN fibers. At the same time, future studies could further develop sustainable and mechanically strong RCC formulations
Comparison of tecvid works written in the Republican period (M. Salih Tanrıbuyruğu, 'Quran Tecvidi', Yakup İskender, 'Question and Answer Tecvidi', Süleyman Doğdu, 'Practical Karabash Tecvidi')
No full textSosyal Bilimler Enstitüsü, Temel İslam Bilimleri Ana Bilim Dalı, Kur’ân-ı Kerîm Okuma ve Kırâat İlmi Bilim DalıKur'an-ı Kerîm'i okurken, doğru telaffuz edebilmek ve mâna bakımından hataya düşmemek için tecvîd ile okumak gereklidir. Kur'an-ı Kerîm'de ve hadislerde tecvîd ile okunması gerektiği vurgulanmıştır. Bu çalışmamız, Kur'an Tecvîdi, Sualli Cevaplı Tecvîd ve Tatbikatlı Karabaş Tecvîdi adlı eserlerinin mukayesesini konu edinmektedir. Her üç eser bağlamında ayrı ayrı tecvîd kavramının mukayesesi, hareke, tenvin, meczûm, sâkin, şedde ve hemze kavramları mukayesesi yapılmıştır. Ek olarak eserlerin bütün konularını içeren Med bahsi çalışmamızda ele alınmıştır. Giriş bölümünde, araştırmanın amacı ve konusu, araştırmanın önemi ve araştırmada uygulanan metot ve kullanılan kaynaklara yer verilmiştir. Birinci bölümde, Tecvîd ilminin tarifi ve konusu yer alır. Tecvîd ilminin konusu, önemi ve gayesi, hükmü, Kur'an ve Sünnetteki yeri, gerekliliği ve tarihçesi yer almaktadır. En son kısımda da Tecvîd ilminin Cumhuriyet Dönemindeki Eserlerde yeri anlatılmıştır. İkinci kısımda, müelliflerin hayatlarından ve ilmi kişiliklerinden, Cumhuriyet döneminde yazılmış tecvîd eserlerine genel bir bakış yapılmış ve Cumhuriyet döneminde yazılmış olan bazı tecvîd eserlerine yer verilmiştir. Üçüncü bölümde, eserlerin mukayesesi yapılmıştır. Sonuç kısmında ise, genel bir değerlendirme yapılarak çalışma nihayete erdirilmiştir.When reading the Quran, it is necessary to read it with tajwid in order to be able to pronounce it correctly and not to make mistakes in terms of meaning. It is emphasized in the Holy Quran and hadiths that it should be read with tajwid. This study is about the comparison of the works of "Quran Tecvîd", "Question-Answer Tecvîd" and "Practical Karabash Tecvîd". Comparison of the concepts of tajwid, harake, tanwin, majzum, sakin, shadda and hemze was made separately for each of the three works. In the introduction, the purpose and subject of the research, the importance of the research, the method applied in the research and the sources used are mentioned. The first section includes the definition and subject of the science of Tajweed. The subject of the science of Tajweed, its importance and purpose, its ruling, its place in the Quran and Sunnah, its necessity and history are included. The last section also explains the place of the science of Tajweed in the works of the Republican Period. In the second part, a general overview of the tajweed works written during the Republican period is given, from the authors' lives and scientific personalities, and some tajweed works written during the Republican period are included. In the third section, the works were compared. In the conclusion section, a general evaluation was made and the study was concluded
Proactive workplace behaviors in the automotive sector: the effect of transformational leadership behavior
No full textThe purpose of this research is to investigate whether there is a significant relationship between proactive workplace behaviors and transformational leadership behavior among private sector employees. If there is a meaningful relationship, the study aims to determine the direction and level of the impact of perceived transformational leadership behavior on proactive workplace behaviors. To achieve this objective, data was collected through face-to-face surveys from employees working in the workshops of Toyota, Nissan, and Peugeot companies operating in the automotive sector in Turkey. Structural equation modeling was employed to test the proposed hypotheses. Partial Least Squares Structural Equation Modeling (PLS-SEM), a variance -based structural equation modeling method, was used to analyze the relationship between the factors included in the research model. The results of the analysis revealed a high and significant relationship between transformational leadership behavior and proactive workplace behaviors. Furthermore, it was found that transformational leadership behavior significantly and positively influenced the sub -dimensions of proactive workplace behaviors, including voice, taking charge, problem prevention, and individual innovation factors