Yıldız Technical University Research Information System
Not a member yet
91324 research outputs found
Sort by
Evaluation of the Performance of Soil-Nailed Walls in Weathered Sandstones Utilizing Instrumental Data
No full textUsed for soil and weathered rocks, soil nails are rigid reinforcements positioned at certain angles on the ground to provide slope stability. A rigid reinforcement element placed in a well filled with cement grout mix after completing drilling will generate adherence stress between the grout-mixed nail bar and soil. Due to this stress, load is transferred to the soil along the soil–grout interaction surface. In the case discussed herein, the slope at the parcel border needed to be made steeper in order to accommodate the construction of a facility in the Taşkısığı region of Sakarya province. Soil-nailed walls, which are inexpensive and suitable for weathered rocks, were needed as a support system because the slope was too steep to support itself. Support system performance was measured using two inclinometers and two soil nail pull-out tests conducted on different sections observed during and after construction. Contrary to the design-phase prediction, it was determined that the stresses started to dampen in the region closer to the slope-facing zone. Field measurement data and numerical analysis revealed that higher parameters than necessary were selected. In this context, sensitivity and parameter analyses were carried out using the Hoek–Brown constitutive model. The GSI value was re-evaluated and found to be compatible with the observation results obtained from the field performance. Since the retaining wall performance observed was higher than expected, geometric parametric analysis of the structural elements was performed; high safety coefficients were found across variations. The effects of the inclination of the slope, nail length, nail spacing, and nail slope design parameters on the safety coefficient and horizontal displacement were examined. The optimal design suggested nail lengths of 4.00 m, a spacing of 1.60 m, and slopes of 20°. It was discovered that the effect of the inclination degree of the slope on the safety coefficient was lower than expected. The results revealed that a more economical design with a similar safety factor can be obtained by shortening the lengths of the nails
The Relationship Between Fear of Missing Out and Loneliness Among Adolescents in the Digital Age: The Mediating Roles of Emotion Dysregulation and Social Media Addiction
No full text
Influence of Cryogenic Treatment and Tempering Temperature on Microstructural Evolution and Dry Sliding Wear Behavior of AISI D3 Cold-Work Tool Steel
No full textAISI D3 cold-work steel was shallow and deep cryogenically treated and double-tempered at 150, 250, and 350 °C temperatures. Cryogenic processes transformed the retained austenite into martensite, while double tempering produced Fe-, Cr-, and W-rich carbides. The wear losses of cryogenically treated specimens decreased by up to 60% compared to conventionally heat-treated samples. Worn surfaces mainly experienced abrasive and adhesive wear mechanisms. Due to the formation of homogeneously dispersed fine carbides at 250 °C, oxidative wear occurred at the matrix phase, resulting in the lowest wear rate. The samples tempered at 150 °C suffered from the severe abrasive action of hard carbide particles, while the samples treated at 350 °C failed because of carbide coarsening
Institutional Creation as a Local Governance Response to Syrian Refugees: The Case of Turkish Municipalities
No full textExternal shocks constitute ideal moments for exploring the creation of new institutions as well as changes within existing ones. This paper treats the influx of Syrian refugees into Turkish urban centers as a critical juncture and investigates the changes in the local governance bodies as a result. Based on interviews and focus group discussions with administrative and nongovernmental actors involved in the local response to refugees, we explore the factors that contributed to the emergence of new institutions within municipalities and their institutionalization as bodies able to resist changes of municipal mayors across elections. We investigate how the newly created institutions matter for refugee policy response in looking at various host cities before and after the 2019 local elections. We argue that actual change in the way institutions operate takes place in municipalities (and their respective departments within) that have managed to institutionalize their refugee response through innovative and sustainable policy initiatives that can spill over to areas of policymaking other than refugee response, which invest in building capacity and multilevel partnerships
Girth and groomed radius of jets recoiling against isolated photons in lead-lead and proton-proton collisions at sNN=5.02 TeV
No full textThis Letter presents the first measurements of the groomed jet radius Rg and the jet girth g in events with an isolated photon recoiling against a jet in lead-lead (PbPb) and proton-proton (pp) collisions at the LHC at a nucleon-nucleon center-of-mass energy of 5.02 TeV. The observables Rg and g provide a quantitative measure of how narrow or broad a jet is. The analysis uses PbPb and pp data samples with integrated luminosities of 1.7 nb−1 and 301 pb−1, respectively, collected with the CMS experiment in 2018 and 2017. Events are required to have a photon with transverse momentum pTγ>100 GeV and at least one jet back-to-back in azimuth with respect to the photon and with transverse momentum pTjet such that pTjet/pTγ>0.4. The measured Rg and g distributions are unfolded to the particle level, which facilitates the comparison between the PbPb and pp results and with theoretical predictions. It is found that jets with pTjet/pTγ>0.8, i.e., those that closely balance the photon pTγ, are narrower in PbPb than in pp collisions. Relaxing the selection to include jets with pTjet/pTγ>0.4 reduces the narrowing of the angular structure of jets in PbPb relative to the pp reference. This shows that selection bias effects associated with jet energy loss play an important role in the interpretation of jet substructure measurements
Towards A More Blended Language Learning With Web 2.0
No full textWhile educational environments are swiftly evolving to embrace and offer increased accessibility to technological resources, the inquiry into the appropriate utilisation of Web 2.0 tools in education persists. Thus, this study investigates the efficiency of a blended language learning environment that incorporates Web 2.0 technologies in accordance with a specifically framed instructional design in enhancing English language learning outcomes and social presence. It seeks to explore the impact of incorporating Padlet in English classes on high school students' academic performance and social presence using a mixed-method approach. The standard English test, postinterviews, social presence scale and needs analysis provided the data. Findings indicate that the integration of Padlet into language classes fosters more collaborative language learning settings that result in increased performance in some language skills and social presence. Accordingly, this study is expected to offer valuable insights for educators regarding creating more interactive classroom contexts via Web 2.0 technologies
t-BAZ KAVRAMI VE BOCHNER UZAYLARINDA FABER POLINOMLARININ t-BAZLIGI
No full textBu tez, fonksiyonel analizde reel veya karmasık sayılarla tanımlanan bazkavramlarının ve kriterlerinin ele alınmasıyla baslamaktadır. Bu kavramlardanhareketle, sonraki asamada üstel sistemlerin (1 < p < +∞) için Lp(−π, π)uzaylarındaki bazlık özellikleri incelenmistir. Üstel sistemler, özellikle Fourierserileri gibi yapılar, analitik fonksiyonların bazlar üzerinde temsilini mümkünkılan temel araçlardır. Bu tür sistemlerin baz olusturma özelliklerininincelenmesi, fonksiyonel analizdeki daha karmasık yapılarla ilişkilendirilen Faberpolinomlarının bazlık özelliklerinin anlasılmasında kritik bir adımdır. Çalısmanınilerleyen bölümlerinde, t-bazlık kavramı temel alınarak, genellestirilmis Faberpolinomlarının Lp(Γ, X) X-degerli Lebesgue uzayındaki (Bochner uzayı olarak adlandırılır) bazlık özellikleri incelenmistir. Burada, Γ karmasık düzlemde kapalı,basit bir Lyapunov ya da Radon egrisi, X ise bir Banach uzayı olarak ele alınmıstır.Ayrıca, X UMD uzayı olması ile Hardy-Bochner sınıflarından H±p(X) uzaylarınatanımlanan operatörlerin terslenebilirlik kosulları analiz edilmistir. Bu operatörlerint-baz olusturma üzerindeki etkileri, Hardy-Bochner uzaylarının özelliklerindenyararlanılarak ayrıntılı bir sekilde açıklanmıstır. Smirnov-Bochner sınıflarındaçift sistemlerin (double system) bazlık özellikleri derinlemesine incelenmis vegenellestirilmis Faber polinomlarının t-bazlık özelliklerine katkıları gösterilmistir.Özel olarak, intΓ ve extΓ alanlarına karsılık gelen X-degerli Smirnov sınıfları E±p(X) tanımlanmıs ve Faber polinomlarının Smirnov-Bochner sınıfları için t-bazolusturdugu gösterilmistir. Bu sonuç kullanılarak, Bochner uzaylarında Faber polinomları ile olusturulan çift sistemin t-bazlıgı kanıtlanmıs ve Smirnov-Bochner sınıflarının bazı özellikleri incelenmistir.Anahtar Kelimeler: Bochner uzayları, Smirnov-Bochner sınıfları, t-bazlık, Faberpolinomları</p
How does working memory affect learning? The interrelationship among working memory, language learning, and mathematical achievement
No full textThis study investigates the relationship among working memory (WM), mathematics, and language, with the aim of understanding: (1) whether the functions and capacities of WM components can predict achievement in language and mathematics; and (2) whether competence in the first language (L1) and achievement in mathematics can predict success in later second language (L2) learning. The participants were 60 Turkish-English bilingual young adults. Data were collected through the Digit Span Task, standardized exams, and a computerized Turkish Reading Span Task developed for this study. The results reveal that: (1) WM significantly explains achievement in both language and mathematics, and (2) competence in L1 and mathematics predicts success in later L2 learning. Based on these findings, it is hypothesized that the domain-specific abilities of language and mathematical skills might share a core network that is strongly linked to the mechanisms of the phonological loop and the central executive, and that rehearsal techniques may modulate the learning achievement of languages and mathematics