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Computational Alloy Design, Synthesis, and Characterization of Wmonbvcrx Refractory High Entropy Alloy Prepared by Vacuum Arc Melting
No full textPrior investigations have demonstrated enhanced mechanical properties, such as hardness and wear resistance, through high-entropy alloy designs that contain refractory metals. We propose the WMoNbVCrx alloy phase space as a single-phase BCC-structured, hard, and refractory high-entropy alloy for the first time. The WMoNbVCrx alloy (x = 0, 0.25, 0.5, 0.75, and 1) system is investigated computationally through CALPHAD and DFT for the equimolar and non-equimolar compositional phase spaces and synthesized through vacuum arc melting. The DFT calculations demonstrated the excellence of specific non-equimolar compositional spaces. It was found that stoichiometries rich in W and poor in V are exceptionally hard, while those rich in V and poor in W demonstrate unprecedented toughness, as determined by the ductility descriptor (Pugh's Ratio). The computational analysis shows the significance of microstructures that contain both (W-rich and W-poor) solid solution, where a synergy between hardness and toughness is created. Our experimental synthesis using vacuum arc melting demonstrated the possibility of successfully producing these alloys with W-rich (dendritic) and W-poor (interdendritic) solid solution regions, starting from elemental powders. The introduction of chromium (Cr) resulted in enhanced microhardness and wear resistance. The peak microhardness was attained when 0.5 moles of Cr were added, reaching 7.03 ±0.24 GPa, accompanied by the least wear volume loss. The produced alloys were found to align with the computationally predicted-designed alloys in terms of the hardness and Young's modulus trends that they follow. This comprehensive investigation underscores the synergistic application of CALPHAD and DFT techniques in the tailored design of novel high-entropy alloys, explaining their synthesis, structural correspondence, and the pivotal role of Cr in enhancing the mechanical properties of these alloys. © 2024 Elsevier B.V.TUBITAK; Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK, (119M980, 1008852020
Arabuluculuğun geleceği II sempozyumu: Bildiri özeti kitabı 24-25 Mayıs 2024
No full textArabuluculuk süreci sonunda taraflarca anlaşmaya varılması halinde arabuluculuk süreci sona erer (HUAK m.17, 1/a; HUAKY m.20, 1/a). Taraflar, sürece dahil ettikleri uyuşmazlık konularıyla ilgili olarak anlaşmaya vardıklarında anlaşmanın içeriğini, ayrıca düzenleyecekleri bir anlaşma belgesine bağlayabilirse de bu zorunlu değildir. Taraflar-ca anlaşılan hususlar hakkında anlaşma belgesi düzenlenirse bu belge taraflar ve arabulucu tarafından imzalanır (HUAK m.18, I; Yön. m.21, 1). Söz konusu anlaşma belgesinin hukukî niteliği bakımından doktrinde farklı görüşler ileri sürülmüştür. Bu anlaşma belgesinin ilâm niteliğinde olup olmadığının ise çeşitli ihtimâllere göre değerlendirilmesi gerekir. Kanunlarda icra edilebilirlik şerhi alınmasının zorunlu kılındığı hâller hariç, taraflar ve avukatlarıyla arabulucunun birlikte imzalamış oldukları anlaşma belgesi ilâm niteliğinde belge sayılır (HUAK m.18, IV; Yön. m.21, VI). Buna karşılık, sadece taraflarla arabulucunun birlikte imzalamış oldukları anlaşma belgesi veya sadece taraflardan birisinin avukatının imzasını taşıyan anlaşma belgesinin ilâm niteliğinde sayılması için görevli mahkemeden, icra edilebilirliğine ilişkin bir şerh alınması gerekir (HUAK m.18, II, son c.). Ticarî uyuşmazlıklar bakımından ise avukatlar ile arabulucunun birlikte imzaladıkları anlaşma belgesinin icra edilebilirlik şerhi aranmaksızın ilâm niteliğinde belge sayılacağı kabul edilmiştir (HUAK m. 18/4). Arabuluculuk süreci sonunda bir anlaşma belgesi düzenlenmemişse, arabulucu tarafından hazırlanan son tutanakta taraflarca üzerinde anlaşılan hususlar belirtilmek suretiyle arabuluculuk süreci sona erdirilir
Kredi Skorlama Modelinde Psikometrik Testlerin Güvenirlik Çalışması
No full textThis study investigates the effectiveness and reliability of using psychometric tests in the credit decision-making processes within the finance sector. Psychometric tests, by measuring individuals' cognitive and psychological traits, hold the potential to broaden access to credit and identify high credit risk. However, after the literature review, it was seen that there was a need for more studies on the reliability and validity of these tests in finance. This study is designed to measure the test-retest reliability of a machine learning model and its inputs that utilize psychometric test results. Within the scope of the research, 115 participants were re-subjected to the same psychometric tests after an average of 6 months. Findings showed that psychometric tests and the machine learning model were generally consistent over time. This work has the potential to fill the gaps in the literature regarding the use of psychometric tests in the finance sector and lays a foundation for future research
The Mediating Role of Instructional Design and Video Length Between Grade Level and Pupil-Content Interaction in Instructional Mathematics Videos on Youtube
No full textThe use of instructional videos is rampant in education; however, their interaction is limited by weak instructional design. Gagne has never insisted on using his renowned 9 Events of Instruction slavishly in situations as a viable paradigm for utilization in video design. Connecting grade level, video length, and interaction, this study seeks to determine the relevance of Gagne's prescribed 9 event sequence in instructional mathematics videos. We scrutinized 50 instructional mathematics videos on YouTube geared towards middle school pupils ranging between 5th and 8th grades. We used quantitative media content analysis for video analysis. In data analysis, partial least squares were used. Bayesian estimation was also resorted to for cross checking. The data revealed that one-third of Gagne's instructional design steps were not always present: activating prior knowledge, eliciting performance, and finally providing feedback. A mediation analysis between grade level and video length revealed that 6 events fully mediated the association between the two. We also elicited the impact of these variables on affective and behavioral interactions in videos. This study assists in creating an idiosyncratic instructional design model, called Birgili's 8 steps for instructional video design, and in infusing this with a melange of four theories. In contrast with the status quo attesting that the literature abounds with scholarly works touting the shorter is the better mantra, the results substantiated that longer may be better in leveraging video interactions provided that the length is judiciously used to conform to instructional design principles
Fuzzy Elephant Herding Optimization and DBSCAN for Emergency Transportation: A Case Study for the 2023Turkiye Earthquake
No full textIn recent times, our planet has experienced numerous natural disasters across all continents. The damage caused by these disasters has been so extensive that Emergency Medical Services (EMS) proved incapable of handling the situation. In this article, we present a novel approach for urgent disaster transport with the aim of minimizing loss of life. In this context, we are investigating the Density-Based Spatial Clustering of Applications with Noise algorithm (DBSCAN) to cluster the large geographic zone affected by the 2023 earthquake in Turkiye. The clustering is done based on hospitals' capacity on one hand and damages on the other hand. The ambulance dispatching task is then tackled using a new fuzzy version of Elephant Herding Optimization called FEHO. This approach addresses the challenge of dispatching ambulances to cover emergency locations effectively and optimally in the clustered regions. Experiments conducted on real data demonstrate the effectiveness of our approach in managing emergency transportation and highlight its potential to minimize the number of casualties
The Association of Subordinates' Perception of the Manager's Ambiguous Behaviors With the Likelihood of Conflict Occurrence: a Cross-Cultural Study
No full textThe research aims to provide evidence to explain the contradictive findings in the literature on the organizational conflict phenomenon and the relationship between conflict and culture, by focusing on the relationship between ambiguous behaviors and conflict. To achieve this goal, in the context of low-status compensation theory, the relationship between incivility, humor as ambiguous behaviors, and the likelihood of managersubordinate conflict occurrence was investigated. To test the culture’s effect on this relationship, survey data were collected from 478 white-collar subordinates working in SMEs in Turkey and the UK. According to the results, the subordinate’s perception of the manager’s ambiguous behaviors affects the likelihood of relationship conflict and task conflict occurrence. In addition, the study reveals that culture is associated with the likelihood of relationship conflict occurrence but not task conflict. The study contributes to the literature by providing evidence for the relationship between humor, incivility, conflict, and culture. © 2024 International Association for Conflict Management
Geotechnical Damage Survey Report on February 6, 2023 Turkey-Syria Earthquake, Turkey
No full textIn response to the significant earthquakes that struck Turkey and Syria on February 6, 2023, a collaborative reconnaissance team, consisting of researchers and engineers from Japan and Turkey, was formed by the Japan Association for Earthquake Engineering, the Architectural Institute of Japan, the Japan Society of Civil Engineers, and the Japanese Geotechnical Society. This coalition conducted an in-depth on-site investigation from March 28 to April 2, two months after the catastrophic seismic events. In Islahiye, a landslide resulted in the formation of a landslide dam. Another landslide occurred in Tepehan on a relatively gentle slope formed of limestone, with possible correlations to fault movements. Iskenderun encountered not just building collapses on soft ground, but also instances of the tilting of buildings and ground subsidence attributed to the liquefaction of reclaimed coastal soil. Golbasi witnessed significant liquefaction-induced damage to structures with shallow foundations on soft ground, involving tilting and settling. However, a more comprehensive investigation is required to accurately map the extent of the liquefied soil layers. Antakya and Kahramanmaras emerged as regions where building damage coincided with surface ground vibrations. Despite severe building collapses, Antakya's relatively stable ground showed an average S-wave velocity exceeding AVS30 400 m/s. This suggests potential wave amplification due to underlying geological structures. Kahramanmaras displayed notable building damage concentrated in alluvial fan formations. (c) 2023 Production and hosting by Elsevier B.V. on behalf of The Japanese Geotechnical Society. This is an open access article under the CC BYNC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Ministry of Education, Science, Sports and Culture [22K21372]To conduct the reconnaissance survey, the authors thank the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Special Purposes (22K21372, PI: Koichi Kusunoki) , and JAEE, AIJ, JSCE, and JGS for their financial and logistical support. The map data are copyrighted by the OpenStreetMap contributors and available from https:// www.openstreetmap.org. The satellite images were downloaded from the website operated by the U.S. Geological Survey (Earth Explorer)
İkinci El Pazarı Literatürünün Son 30 Yıldaki Gelişimi Üzerine Bibliyometrik Bir Analiz
No full textHem araştırmacılar hem de uygulayıcılar tarafında, ikinci el ürünlere artan bir ilgi bulunmaktadır. Bu nedenle bu çalışma, konuyla ilgili literatür gelişimine ışık tutmak için literatürdeki ikinci el pazarının gelişimini incelemeyi amaçlamaktadır. Bu doğrultuda literatürde ikinci el pazarı kavramı üzerine geçmişten günümüze yapılan çalışmalar üzerinden bibliyometrik bir analiz yapılmıştır. Çalışma için toplam 235 doküman incelenmiştir. Sonuçlar ikinci el tüketimin yeni bir tüketici davranışı türü olarak ortaya çıktığını ve daha sonra literatürde bir iş modeli olarak incelendiğini ve sürdürülebilirliğin hem akademik hem de uygulama alanlarında artan önemi ile birlikte hatırı sayılır bir tüketim şekli haline geldiğini göstermektedir. İkinci el ürünler stil ve sürdürülebilirlik yönünü daha fazla vurgulayan önemli bir pazar yaratmıştır. İkinci el üzerine yapılan çalışmalarda en sık tekrarlanan terim döngüsel ekonomidir. İkinci el giyim, işbirlikçi tüketim, paylaşım ekonomisi ve yeniden kullanım konularında yapılan çalışmalar son yıllarda artış göstermiştir Sonuçların hem literatüre hem de ikinci el perakendecilerine katkı sağlaması beklenmektedir
Central Bank Digital Currency in an Emerging Market Economy: Case of the Central Bank of the Republic of Türkiye
No full textCentral banks have historically been using traditional channels for communication and physical money for transactions, fulfilling the needs of previous millennia, while the evolution of technology, electronic devices, and needs in transactions necessitate the use of modern communication channels, such as X (formerly known as Twitter), as well as modern payment systems, such as central bank digital currencies (CBDC). Hence, this paper aims to unfold where the Central Bank of the Republic of Türkiye (CBRT), as an example of emerging markets, stands in informing the public about CBDC. To this end, it conducts an event study on the official X account of CBRT in English over 10.2020-12.2022 by utilizing Nvivo. The findings of the quantitative analysis of the tweets show that CBRT does not regard X as a primary communication channel and mainly shares links to publications from the official websites in X. Also, CBRT tends to adopt a ‘cold-turkey’ informative approach about CBDC with the public rather than ‘gradualism’. Consequently, CBRT should rigorously design a communication strategy that fulfills the needs of the modern economy and start addressing CBDC to raise awareness if a quick transition to digital currency is targeted
When the Personal and the Collective Intersects: Memory, Future Thinking, and Perceived Agency During the Covid-19 Pandemic
No full textDo collective crises have an impact on the characteristics of mental time travel for individuals and collectives? The COVID-19 pandemic provides a unique context to address this question due to the intersection it created between the personal and the collective domains. In two studies (N = 273), we examined the valence and perceived agency involved in memory and future thinking for personal and collective domains. The second study also included a longitudinal component with 43 participants completing both studies. In research done prior to the pandemic, a valence-based dissociation between personal and collective events was consistently observed in Western samples. We wanted to see if these patterns changed during different stages of the pandemic. In the first study, participants no longer exhibited the usual positivity bias for the personal future, while in the second study, they did not exhibit the usual negativity bias for the collective future. The second aim of the current article was to assess the agency people attribute to themselves and their nation over events and how that relates to valence. People always attributed more agency to themselves over positive events than negative events in both personal and collective domains. Perceived nation agency, however, was associated with positivity in the collective domain but with negativity in the personal domain. Longitudinal analyses confirmed these patterns. Taken together, these results indicate that a collective crisis that has immediate and profound effects on personal lives can alter the patterns observed for mental time travel, especially for the future.Grant Behavioral and Cognitive Sciences from the National Science Foundation [1827182]The research was supported by Grant Behavioral and Cognitive Sciences-1827182 from the National Science Foundation to William Hirst