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Determination of the Strong Coupling Constant From Transverse Energy-Energy Correlations in Multijet Events at √ S=13 Tev With the Atlas Detector
No full textMeasurements of transverse energy-energy correlations and their associated azimuthal asymmetries in multijet events are presented. The analysis is performed using a data sample corresponding to 139 fb(-1) of proton-proton collisions at a centre-of-mass energy of root s = 13TeV, collected with the ATLAS detector at the Large Hadron Collider. The measurements are presented in bins of the scalar sum of the transverse momenta of the two leading jets and unfolded to particle level. They are then compared to next-to-next-to-leading-order perturbative QCD calculations for the first time, which feature a significant reduction in the theoretical uncertainties estimated using variations of the renormalisation and factorisation scales. The agreement between data and theory is good, thus providing a precision test of QCD at large momentum transfers Q. The strong coupling constant alpha(s) is extracted as a function of Q, showing a good agreement with the renormalisation group equation and with previous analyses. A simultaneous fit to all transverse energy-energy correlation distributions across different kinematic regions yields a value of alpha(s)( mZ) = 0.1175 +/- 0.0006 (exp.)(+0.0034) (-0.0017) (theo.), while the global fit to the asymmetry distributions yields alpha(s)(m(Z)) = 0.1185 +/- 0.0009 (exp.)(+0.0025)(-0.0012)(theo.)
Covıd-19 Pandemisinin E-ticaret Yoluyla Konut Mobilyası Satışı Üzerindeki Etkisi
No full textCOVID-19 pandemisi, birçok sektörü olduğu gibi mobilya sektörünü de derinden etkilemiştir. Pandemi, insanların evlerinde daha fazla vakit geçirmesi nedeniyle, ev mobilyalarına olan talebi arttırmış, tedarik zincirlerindeki kesintiler ve üretim süreçlerindeki aksamalar nedeniyle mobilya satın alma tercihlerinde değişikliklere neden olmuştur. Buaraştırmada, pandemi sürecinde konutlarda ihtiyaç duyulan mobilyaların temin edilme şekilleri ve E-ticaretin mobilya satışları üzerindeki etkilerinin belirlenmesi amaçlanmıştır. Araştırmanın amacına uygun olarak hazırlanmış olan ankete toplam 154 konut kullanıcısı katılmıştır. Elde edilen sonuçlara göre, COVID-19 pandemisi öncesinde konut mobilyalarının %63,23’ünün mağazadan satın alındığı, pandemi sürecinde bu oranın %46,19’a düştüğü, pandemi sonrasında ise %50,17’ye çıktığı belirlenmiştir. Öte yandan COVID-19 pandemisi öncesinde konut mobilyalarının %10,94’ünün internet üzerinden satın alındığı, pandemi sürecinde bu oranın %28,86’ya çıktığı, pandemi sonrasında ise %24,15 düştüğü belirlenmiştir. Ayrıca, katılımcıların cinsiyetinin konutlarında ihtiyaç duyduğu mobilyaları E-ticaret yoluyla satın almaları üzerinde etkili olduğu, yaş ve eğitim farklılıklarının ise önemli bir etkisinin olmadığı tespit edilmiştirThe COVID -19 pandemic has deeply affected the furniture industry as well as many other sectors. The pandemic has increased demand for home furnishings as people spend more time at home, and it has led to changes in furniture purchasing preferences due to interruptions in supply chains and disruptions in production processes. In this research, it is aimed to determine the way of supplying the furniture needed in the houses during the pandemic process and the effects of e-commerce on furniture sales. A total of 154 residential users participated in the survey, which was prepared in accordance with the purpose of the research. According to the results, it was determined that 63.23% of the residential furniture was purchased from the store before the COVID-19 pandemic,this rate decreased to 46.19% during the pandemic process, and increased to 50.17% after the pandemic. On the other hand, it was determined that 10.94% of residential furniture was purchased online before the COVID-19 pandemic, this rate increased to 28.86% during the pandemic process, and decreased to 24.15% after the pandemic. In addition, it has been determined that the gender of the participants has an effect on the purchase of the furniture they need in their homes through e-commerce, while the age and education differences donot have a significant effec
Slow City Urban Identities: a Comparative Study on Public Spaces of Seferihisar and Trani
No full textThe formation of Slow City (Cittaslow), which is defined as a kind of sustainability movement, aims to preserve the collective memory, to protect the city, and to maintain the repetition that makes a space a home and the healthy relations between the people who keep the home alive. In this context, it would be appropriate to say that the formation is a kind of cultural sustainability movement. Negativities brought about by the rapidly developing and changing world leads to the creation of urban areas that are unidentified, uniform and have neither connection with the past nor the future. According to this concept, the main purpose of the research is to analyze to what extent the cultural identities of the cities under the scope of Slow City are read through the urban texture. At this point, as a research area, a comparative analysis study is carried out on the first Slow City of Turkey, "Seferihisar” and on the other hand, "Citta di Trani" from the country where the mentioned formation was born. For the comparison of the two cities mentioned, the criteria that are effective in the formation of urban identity are taken as basis. As the research areas are selected from two different countries, two different cultures’ approach to the formation is revealed
Effects of Process Parameters on Strengthening Mechanisms of Additively Manufactured Alsi10mg
No full textIn industries like automotive and aerospace, the demand for structures with a high strength-weight ratio is increasing. Additive manufacturing (AM) studies and applications of AlSi10Mg material have increased due to the improvement of mechanical properties when the production is performed at high cooling rates in the laser-powder bed fusion (L-PBF) method. The study aims to investigate the effect of the AM process parameters on the microstructure features, and determine the mathematical relationship between yield strength and process parameters to obtain better mechanical properties. In this study, AlSi10Mg specimens are manufactured using L-PBF method with different process parameters. Microstructure images of the manufactured specimens are obtained by scanning electron microscopy. Melt pool width, eutectic cell size and diameter of Si precipitates are measured using the microstructure images. Parametric equations are generated between the process parameters and microstructural features including eutectic cell size and Si precipitate diameter. Thus, relationships between strengthening mechanisms and process parameters are established by integrating the generated equations into the related strengthening mechanisms. Consequently, the yield strength model of AlSi10Mg material is developed as a function of the process parameters of L-PBF method. It is found that the developed model estimates close results to the nano-indentation results.Scientific and Technological Research Council of Turkey (TUEBITAK); [5189901]This study is a part of the project (# 5189901) supported by The Scientific and Technological Research Council of Turkey (TUEBITAK) under the Frontier R ; D Laboratory Support Programme and performed in Turkish Aerospace Industries Inc. This work was funded by The Scientific and Technological Research Council of Turkey (TUEBITAK) (5189901
The Cfd Computation and Validation of Effects of Adaptive Mesh Refinement in Sloshing Simulation in a Narrow Tank
No full text9th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2023 -- 6 August 2023 through 8 August 2023 -- 309509Strong and precise computational methods are necessary to discover and understand undesirable effects in tanks where liquids slosh, known as sloshing. Sloshing is important for many industrial applications, such as fuel tanks in ships, aircraft, and other transport vehicles. Numerical methods are commonly used in modelling sloshing behaviour, and adaptive mesh refinement (AMR) technology is an effective method used to increase numerical accuracy in sloshing simulations. The primary objective of this research isto conduct Computational Fluid Dynamics (CFD) calculations of sloshing phenomena to establish a methodology for observing the undesirable effects on the relevant system and assess the effectiveness of adaptive mesh refinement by comparing the results of surface impact pressures with experimental case results from literature. A 3D model of a rectangular tank partially filled with water is used to simulate the impact pressure caused by roll motion. The roll motion is based on experimental data and occurs at periods close to the tank's internal wave resonance period. The pressure results are observed from a single monitoring point. Numerical studies are performedusing Star CCM+ software. The Volume of Fluid (VOF) based Eulerian method is utilised to model the free surface flow. The study demonstrates the ability of AMR to accurately model sloshing behaviour and compares fixed and AMR grids at different levels. Finally, the results of fixed and adaptive cartesian grids are compared and verified with corresponding experimental data. The results showed thatthe AMR grid provided higher numerical accuracy, lower computational cost and allowed for more accurate modelling of sloshing behaviour. It is emphasised that the importance of AMR for understanding sloshing behaviour and modelling it accurately. © 2023, Avestia Publishing. All rights reserved
Kompakt Fotonik Entegre Bagdastiricilarin Günes Hücresi ve Yonga Üstü Uygulamalar için Evrimsel Algoritmalar ile Tasarimi
No full textCoupling is an important aspect of manipulating electromagnetic waves as it involves the transfer of energy between two or more systems via electromagnetic fields. Over the years, humanity has learned to control electromagnetic waves through the development of devices such as waveguides, antennas, and lenses. This has allowed the creation of more efficient and versatile systems for a variety of applications. The need for better solar cells, fiber-to-chip couplers and waveguide-to-waveguide couplers is driven by the ever-increasing demand for sustainable energy sources, faster and more reliable communication networks, and integrated photonic systems. Improved solar cells can contribute to a cleaner energy future, while advanced couplers enable seamless integration of fiber optics and photonic integrated circuits, resulting in more efficient data transmission and powerfull computing. Waveguide to substrate coupler is a device that has not been given much attention until today. Optimizing these couplers can dramatically increase the efficiency and compactness of THz antenna arrays, lensless imaging systems, and lab-on-a-chip. While THz antenna arrays could revolutionize wireless communication and sensing applications, they have the potential to transform lensless imaging, medical diagnostics and materials characterization. On the other hand, labs on a chip will promise to shrink and streamline complex laboratory processes, paving the way for portable and highly integrated diagnostic tools. In summary, devices that provide the coupling of electromagnetic waves in various applications are critical and algorithms have come to the fore in the design of these devices in recent years. Particle swarm optimization and genetic algorithm, which are evolutionary algorithms, provide many advantages compared to traditional design methods. First, photonic devices often have multidimensional parameter spaces. Evolutionary algorithms are well suited to navigating these complex areas as they can effectively search a wide variety of possible solutions. Second, evolutionary algorithms are more likely to find the overall optimum, as opposed to gradient-based optimization methods that can easily stuck to local minimums. Third, particle swarm optimization and genetic algorithms can be easily tailored to specific design constraints and goals. Finally, evolutionary algorithms are inherently resilient to noise and uncertainties in the design process. Taking advantage of the strengths of particle swarm optimization and genetic algorithms, this thesis explains the importance of photonic couplers and the algorithms used in the first part. In the second part, surface shaping for solar cells and fiber to chip coupler designs are given. In the third part, devices that enable the light to be integrated within the chip are designed. In the last part, the results obtained in the thesis are interpreted and the predictions are shared.Bağdaşım, elektromanyetik alanlar yoluyla iki veya daha fazla sistem arasında enerji transferini içerdiğinden, elektromanyetik dalgaları manipüle etmenin önemli bir yönüdür. Yıllar geçtikçe insanlık, dalga kılavuzları, antenler ve lensler gibi cihazların geliştirilmesi yoluyla elektromanyetik dalgaları kontrol etmeyi öğrendi. Bu, çeşitli uygulamalar için daha verimli ve çok yönlü sistemler oluşturulmasını sağladı. Daha iyi güneş hücrelerine, fiberden çipe bağdaştırıcılara ve dalga kılavuzundan dalga kılavuzuna bağdaştırıcılara olan ihtiyaç, sürdürülebilir enerji kaynaklarına, daha hızlı ve daha güvenilir iletişim ağlarına ve entegre fotonik sistemlere yönelik sürekli artan talepten kaynaklanmaktadır. Geliştirilmiş güneş hücreleri, daha temiz bir enerji geleceğine katkıda bulunabilirken, gelişmiş bağdaştırıcılar, fiber optiklerin ve fotonik entegre devrelerin sorunsuz entegrasyonunu sağlayarak daha verimli veri iletimi ve güçlü bilgisayarları ortaya çıkarabilir. Dalga kılavuzundan alttaşa bağdaştırıcılar günümüze kadar üzerinde fazla durulmamış cihazlardır. Bu bağdaştırıcıları optimize etmek, THz anten dizilerinin, lenssiz görüntüleme sistemlerinin ve çip üstü laboratuvarların verimliliğini ve kompaktlığını önemli ölçüde artırabilir. viii THz anten dizileri, kablosuz iletişim ve algılama uygulamalarında devrim yaratabilirken, lenssiz görüntüleme, tıbbi teşhis ve malzeme karakterizasyonunu dönüştürme potansiyeline sahiptir. Öte yandan, çip üstü laboratuvarlar, karmaşık laboratuvar süreçlerini küçültmeyi ve kolaylaştırmayı vaat ederek, taşınabilir ve son derece entegre teşhis araçlarının yolunu açacaktır. Özetle, çeşitli cihazlarda elektromanyetik dalgaların bağdaşımını sağlayan cihazlar kritiktir ve bu cihazların tasarımıda son yıllarda algoritmalar öne çıkmaktadır. Evrimsel algoritmalardan olan parçacık sürü optimizasyonu ve genetik algoritma geleneksel tasarım yöntemlerine kıyasla pek çok avantaj sağlamaktadır. İlk olarak, fotonik cihazlar genellikle çok boyutlu parametre uzaylarına sahiptir. Evrimsel algoritmalar, çok çeşitli olası çözümleri etkili bir şekilde araştırabildikleri için bu karmaşık alanlarda gezinmek için çok uygundur. İkincisi, yerel minimumlara kolayca takılabilen gradyan tabanlı optimizasyon yöntemlerinin aksine, evrimsel algoritmaların genel optimumu bulma olasılığı daha yüksektir. Üçüncüsü, bu algoritmalar, belirli tasarım kısıtlamalarına göre kolayca uyarlanabilir. Son olarak evrimsel algoritmalar, tasarım sürecindeki gürültüye ve belirsizliklere karşı doğal olarak dayanıklıdır. Parçacık sürü optimizasyonu ve genetik algoritmaların güçlü yönlerinden yararlanan bu tez, ilk kısımda fotonik bağdaştırıcıların önemini ve kullanılan algoritmaları anlatmaktadır. İkinci kısımda güneş hücreleri için yüzey şekillendirme ve fiberden çipe bağdaştırıcı tasarımı verilmiştir. Üçüncü kısımda ışığın çip içinde bağdaştırılmasını sağlayan cihazlar tasarlanmıştır. Son kısımda ise tezde elde edilen sonuçlar yorumlanmış ve öngörüler paylaşılmıştır
Search for Dark Photons From Higgs Boson Decays Via Zh Production With a Photon Plus Missing Transverse Momentum Signature From Pp Collisions at √s=13 Tev With the Atlas Detector
No full textThis paper describes a search for dark photons (gamma(d)) in proton-proton collisions at root s = 13TeV at the Large Hadron Collider (LHC). The dark photons are searched for in the decay of Higgs bosons ( H -> gamma gamma(d)) produced through the ZH production mode. The transverse mass of the system, made of the photon and the missing transverse momentum from the non-interacting gamma(d), presents a distinctive signature as it peaks near the Higgs boson mass. The results presented use the total Run-2 integrated luminosity of 139 fb(-1) recorded by the ATLAS detector at the LHC. The dominant reducible background processes are estimated using data-driven techniques. A Boosted Decision Tree technique is adopted to enhance the sensitivity of the search. As no excess is observed with respect to the Standard Model prediction, an observed (expected) upper limit on the branching ratio BR( H -> gamma gamma(d)) of 2.28% (2.82(-0.84%)(+1.33)) is set at 95% CL for massless gamma(d). For massive dark photons up to 40 GeV, the observed (expected) upper limits on BR( H -> gamma gamma(d)) at 95% confidence level is found within the [2.19,2.52]% ([2.71,3.11]%) range.ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW, Austria; FWF, Austria; ANAS, Azerbaijan; CNPq, Brazil; FAPESP, Brazil; NSERC, Canada; CFI, Canada; NSFC, China; MEYS CR, Czech Republic; DNRF, Denmark; DNSRC, Denmark; IN2P3-CNRS, France; CEA-DRF/IRFU, France; BMBF, Germany; MPG, Germany; Hong Kong SAR, China; ISF, Israel; INFN, Italy; MEXT, Japan; JSPS, Japan; CNRST, Morocco; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS, Slovenia; MIZS, Slovenia; MICINN, Spain; Wallenberg Foundation, Sweden; SERI, Switzerland; MOST, Taiwan; DOE, United States of America; NSF, United States of America; BCKDF, Canada; CANARIE, Canada; Compute Canada, Canada; Czech Republic [PRIMUS 21/SCI/017, UNCE SCI/013]; COST, European Union; ERC, European Union; ERDF, European Union; Horizon 2020, European Union; Marie Skodowska-Curie Actions, European Union; Investissements d'Avenir Labex, France; Investissements d'Avenir Idex , France; ANR, France; DFG , Germany; AvH Foundation, Germany; Herakleitos programme - EU-ESF, Greece; Thales programme - EU-ESF, Greece; Aristeia programme - EU-ESF, Greece; Greek NSRF, Greece; BSF-NSF, Israel; MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN, Poland; NAWA, Poland; La Caixa Banking Foundation, Spain; CERCA Programme Generalitat de Catalunya, Spain; PROMETEO Programme Generalitat Valenciana, Spain; GenT Programme Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; Royal Society, United Kingdom; Leverhulme Trust, United Kingdom; STFC, United Kingdom; TENMAK, Turkiye; Canton of Geneva, Switzerland; Canton of Bern, Switzerland; SNSF, Switzerland; SRC, Sweden; DSI/NRF, South Africa; NWO, Netherlands; Benoziyo Center, Israel; RGC, China; GSRI, Greece; HGF, Germany; SRNSFG, Georgia; Minciencias, Colombia; MOST, China; CAS, China; ANID, Chile; CERN; NRC, CanadaWe acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; ANID, Chile; CAS, MOST and NSFC, China; Minciencias, Colombia; MEYS CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRI, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MEiN, Poland; FCT, Portugal; MNE/IFA, Romania; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DSI/NRF, South Africa; MICINN, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TENMAK, Turkiye; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; PRIMUS 21/SCI/017 and UNCE SCI/013, Czech Republic; COST, ERC, ERDF, Horizon 2020 and Marie Skodowska-Curie Actions, European Union; Investissements d'Avenir Labex, Investissements d'Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and MINERVA, Israel; Norwegian Financial Mechanism 2014-2021, Norway; NCN and NAWA, Poland; La Caixa Banking Foundation, CERCA Programme Generalitat de Catalunya and PROMETEO and GenT Programmes Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom
Ceo Turnover: the Impact of the Ceo’s Internal and External Appointment on Company Success
No full textThis study examines the performances of insider and outsider CEOs (Chief Executive Officer) based on the top 100 companies in 2021 issue of the Brand Finance Turkey report. Each company has executive managers who plan and manage strategies to advance within the scope of the relevant mission and vision. The influence of managers, known as CEO or General Manager, is of great importance to the company. The article examined CEOs, financial statements and share values of the top companies traded in Istanbul Stock Exchange between the years 2010-2019. Assuming that all other conditions are equal, the impact of relevant CEOs appointed from inside or outside the firm, on the company's success had been studied. ROA (Return on Assets), ROE (Return on Equity) calculations and the change in the Borsa Istanbul share prices of each company in terms of each CEO change for the related years have been analyzed. In addition, the number of CEOs along with their tenure were also calculated. t-Test was used on the data. In conclusion CEO’s internal and external appointment had little to no impact on the company's success and share value
Examining the Attitudes of Turkish Adults Towards Syrian Children From the Perspectives of Intergroup Contact Theory and Social Identity Theory
No full textThis thesis research aims to examine the attitudes of Turkish adults towards Syrian children and the variables influencing these attitudes within the framework of the Intergroup Contact Theory and Social Identity Theory. Studies have revealed that negative attitudes towards Syrian children are one of negative conditions to which Syrian children are exposed. The research hypotheses were tested with 254 participants (185 Female, 61 Male, Mage =28.04) through an online survey consisting of various scales. Results revealed that when a Turkish child exerts more effort to obtain the reward, Turkish adults tend to and consider it fair to distribute the reward based on the principle of equity. However, when a Syrian child exerts more effort to obtain the reward, they tend to and consider it fair to distribute the reward based on the principle of equality. In addition, social distance (more willingness to engage with Syrians through a variety of means), (positive) emotions toward refugee children, (higher) religiosity and parenthood (having a child) were positively associated; while (more) exposure to Syrian refugees and (higher) income were negatively associated with attitudes toward refugee children. Finally, group attachment was positively correlated with negative attitudes toward Syrian refugee children.Bu tez arastirmasi, Türkiyeli yetiskinlerinin Suriyeli çocuklara yönelik tutumlarini ve bu tutumlari etkileyen çesitli degiskenleri Gruplar Arasi Temas Kurami ve Sosyal Kimlik Kurami çerçevesinde incelemek amaciyla gerçeklestirilmistir. Çalismalar, Suriyeli çocuklara yönelik olumsuz tutumlarin Suriyeli çocuklarin maruz kaldigi olumsuz kosullardan biri oldugunu ortaya koymustur. Arastirma hipotezleri, 254 katilimci (185 Kadin, 61 Erkek, Ort.yas= 28.04) ile çesitli ölçeklerden olusan bir online anket üzerinden test edilmistir. Sonuçlar, ödülü elde etmek için Türk bir çocuk daha fazla çaba sarf ettiginde, Türk yetiskinlerinin ödülü hakçalik prensibine göre dagitma ve bunu hakli bulmaya egilim gösterdiklerini ortaya koymustur. Ancak, Suriyeli bir çocuk ödülü elde etmek için daha fazla çaba sarf ettiginde, Türk yetiskinlerin ödülü esitlik prensibine göre dagitma ve bunu hakli bulma egilimi gösterdikleri görülmüstür. Ayrica, sosyal mesafe (Suriyeliler ile sosyal temas kurmaya daha fazla istekli olma), (olumlu) duygular, (daha yüksek) dindarlik ve ebeveynlik (çocuk sahibi olma) Suriyeli çocuklara yönelik tutumlar ile pozitif olarak iliskiliyken; (daha fazla) Suriyeli mülteciye maruz kalma ve (daha yüksek) gelir ise Suriyeli çocuklara yönelik tutumlar ile ile negatif olarak iliskili bulunmustur. Son olarak, gruba baglilik degiskeni ile Suriyeli çocuklara yönelik olumsuz tutumlar arasinda pozitif bir korelasyon oldugu bulunmustur
A Simple Cascade Channel Estimation Method for Uav Ris-Enabled Millimeter Wave Transmissions
No full text10th International Conference on Wireless Networks and Mobile Communications, WINCOM 2023 -- 26 October 2023 through 28 October 2023 -- 194643Reconfigurable Intelligent Surfaces (RIS) is an emerging concept in Sixth Generation (6G) technologies. RIS can manipulate the wireless communication environment and provide virtual Line of Sight (LOS) links between a Base Station(BS) and User Equipment (UE) by controlling the coefficients of passive reflecting elements. RIS is a promising concept with its passive and low-cost nature. However, RIS-enabled transmission experiences double scattering and high path loss. Besides, it requires a massive number of elements in the millimeter-wave(mmWave) and sub-TeraHertz(THz), which makes channel estimation a complicated problem. There are quite a number of diverse methods in recent literature. In this work we assume a Unmanned Aerial Vehicle(UAV)-mounted RIS that provides a line of sight. We propose a simple cascade channel estimation method and compare its performance with that of a recently proposed channel estimation scheme. We perform comparisons, taking the overhead caused by Fifth Generation (5G) Low Density Parity Check (LDPC) coding and channel estimation overhead into account. Simulations show that our proposal achieves a much better spectral efficiency. © 2023 IEEE.Türkiye Bilimsel ve Teknolojik Araştırma Kurumu, TÜBİTAK: 122E40