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Model-Agnostic Search for Dijet Resonances with Anomalous Jet Substructure in Proton-Proton Collisions at S=13 TeV
No full textKunnawalkam Elayavalli, Raghav/0000-0002-9202-1516; Azzi, Patrizia/0000-0002-3129-828X; D'Enterria, David/0000-0002-5754-4303; Holmes, Tova/0000-0002-3959-5174; Ivanov, Andrew/0000-0002-9270-5643; Tytgat, Michael/0000-0002-3990-2074; Papageorgakis, Christos/0000-0003-4548-0346; Ferencek, Dinko/0000-0001-9116-1202; Klyukhin, Vyacheslav/0000-0002-8577-6531; Heredia De La Cruz, Ivan/0000-0002-8133-6467; Singh, Jasbir/0000-0001-9029-2462; Sharma, Ashish/0000-0002-0688-923X; You, Zhengyun/0000-0001-8324-3291; Ecklund, Karl/0000-0002-6976-4637; Legger, Federica/0000-0003-1400-0709; Wittich, Peter/0000-0002-7401-2181; Kyberd, Paul/0000-0002-7353-7090; Delgado Peris, Antonio/0000-0002-8511-7958; Fouz Iglesias, Maria Cruz/0000-0003-2950-976X; Karneyeu, Anton/0000-0001-9983-1004; Lipton, Ronald/0000-0002-6665-7289; Selvaggi, Michele/0000-0002-5144-9655; Tornago, Marta/0000-0001-6768-1056; Usai, Emanuele/0000-0001-9323-2107; Geurts, Frank/0000-0003-2856-9090; Garcia, Francisco/0000-0002-4023-7964; De La Cruz Burelo, Eduard/0000-0002-7469-6974; Colaleo, Anna/0000-0002-0711-6319; Wilson, Jonathan/0000-0002-5672-7394; Bortignon, Pierluigi/0000-0002-5360-1454; Dozen, Candan/0000-0002-4301-634X; Sculac, Ana/0000-0001-7938-7559; Duarte, Javier Mauricio/0000-0002-5076-7096; Krintiras, Georgios Konstantinos/0000-0002-0380-7577; Diaz, Daniel/0000-0001-6834-1176This paper presents a model-agnostic search for narrow resonances in the dijet final state in the mass range 1.8-6 TeV. The signal is assumed to produce jets with substructure atypical of jets initiated by light quarks or gluons, with minimal additional assumptions. Search regions are obtained by utilizing multivariate machine-learning methods to select jets with anomalous substructure. A collection of complementary anomaly detection methods-based on unsupervised, weakly supervised, and semisupervised algorithms-are used in order to maximize the sensitivity to unknown new physics signatures. These algorithms are applied to data corresponding to an integrated luminosity of 138 fb-1, recorded by the CMS experiment at the LHC, at a center-of-mass energy of 13 TeV. No significant excesses above background expectations are seen. Exclusion limits are derived on the production cross section of benchmark signal models varying in resonance mass, jet mass, and jet substructure. Many of these signatures have not been previously sought, making several of the limits reported on the corresponding benchmark models the first ever. When compared to benchmark inclusive and substructure-based search strategies, the anomaly detection methods are found to significantly enhance the sensitivity to a variety of models.SC; FWF; FNRS; FWO (Belgium); CNPq; CAPES; FAPERJ; FAPERGS; FAPESP (Brazil); BNSF (Bulgaria); MoST; NSFC (China); CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador) [MoER TK202]; ERC PRG; Academy of Finland; MEC; CEA; CNRS/IN2P3 (France); SRNSF; BMBF; DFG; HGF (Germany); NKFIH (Hungary); DAE; DST; IPM; SFI (Ireland); INFN (Italy); NRF (Republic of Korea); MES (Latvia); MOE; UM (Malaysia); BUAP; CONACYT; UASLP-FAI (Mexico); PAEC (Pakistan); FCT (Portugal); MESTD (Serbia); PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); NSTDA; TUBITAK; DOE; NSF (USA)We congratulate our colleagues in the CERN accelerator departments for the excellent performance of the LHC and thank the technical and administrative staffs at CERN and at other CMS institutes for their contributions to the success of the CMS effort. In addition, we gratefully acknowledge the computing centers and personnel of the Worldwide LHC Computing Grid and other centers for delivering so effectively the computing infrastructure essential to our analyses. Finally, we acknowledge the enduring support for the construction and operation of the LHC, the CMS detector, and the supporting computing infrastructure provided by the following funding agencies: SC (Armenia), BMBWF and FWF (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES and BNSF (Bulgaria); CERN; CAS, MoST, and NSFC (China); MINCIENCIAS (Colombia); MSES and CSF (Croatia); RIF (Cyprus); SENESCYT (Ecuador); ERC PRG, RVTT3 and MoER TK202 (Estonia); Academy of Finland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); SRNSF (Georgia); BMBF, DFG, and HGF (Germany); GSRI (Greece); NKFIH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LMTLT (Lithuania); MOE and UM (Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Montenegro); MBIE (New Zealand); PAEC (Pakistan); MES and NSC (Poland); FCT (Portugal); MESTD (Serbia); MCIN/AEI and PCTI (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland); MST (Taipei); MHESI and NSTDA (Thailand); TUBITAK and TENMAK (Turkey); NASU (Ukraine); STFC (United Kingdom); DOE and NSF (USA)
Examination of Erosion Wear Behavior of Alsi10Mg Alloy Produced by Additive Manufacturing and Casting Methods in Cryogenic Environments
No full textIn this thesis, the erosion wear behaviour of AlSi10Mg alloys produced by metal additive manufacturing method, which is preferred in sectors such as aviation, aerospace, automotive, agriculture, mining, medical and dentistry, has been investigated. In order to compare additive and conventional manufacturing methods, test specimens were produced by selective laser melting method and aluminium injection casting method, which are powder-based additive manufacturing applications. The effect of heat treatment on erosion behaviour was investigated by applying heat treatment (T6) to a group of specimens produced for repeated tests. Silicon Carbide (SiC) erosive particles with a size of ~350 µm were used to determine the effect of particle effect in erosion tests and solid particle erosion wear results were obtained for different parameters. In order to determine the impact velocity of erosive particles on the surface of the target material, the air flow velocity was found to be 60 m/s with a sensor. In the determination of the velocities of particles at the moment of mixing with air, the free fall velocity was determined to be approximately 2,24 m/s by simulations based on Discrete Element Method (DEM). The values measured by simulation and sensor were combined with Euler's Langerian Particle Tracking (LPT) flow model to theoretically calculate the particle impact velocity of ~25 m/s. Particle impact velocity was also measured by double disc method and theoretical and experimental convergence results were obtained. Another important parameter among the solid particle erosion wear parameters, the impact angle, was compared using six different impact angles (15° to 90° constant increase). The experiments were carried out at room temperature and cryogenic ambient conditions (≤-100°C). In order to ensure cryogenic conditions, cryogenic conditions were verified with sensor sensitivity by providing controlled contact of the test samples in certain groups with liquid nitrogen (-196°C) in a styrofoam closed chamber capable of representing the container feature. The experiments were carried out on a specially designed test machine capable of ASTM G76/G211 standards and the impact angle- erosion rate graphs were created at end of the impact angle- erosion rate graphs at end of the weight loss data and alternative manufacturing method, heat treatment effect comparisons in the priority of international literature compatibility. Correlation analysis was applied in order to make sense of the erosion wear behaviour of the test specimens and to provide statistical data. In order to compare the results obtained from the experiments, discrete element based simulation activities were carried out with Ansys Rocky DEM software on non-heat treated additive manufacturing specimens and simulation related erosion rates were calculated and it was understood that the relevant software can be useful within various limits in determining the erosion rate. After the completion of all experiments with three repetitions, SEM images were taken from the surfaces of the eroded samples at various magnification scales and XRD analysis was applied to the samples. As a result of the surface analyses, it was observed that surface structure was intensely degraded due to plastic deformation on the surfaces and collapses, particle embedment and crushing marks were observed on the surfaces as a result of interaction with particles. The resulting surface damages support the ductile and fully ductile material characteristics obtained from erosion tests. Within the scope of presenting outputs of this thesis study, it has been concluded that AlSiMg10 alloys produced by additive manufacturing can provide more erosion resistance than those produced by conventional manufacturing methods in terms of solid particle erosion wear results depending on experimental activities and simulation studies. It is also determined that T6 heat treatment improves the erosion wear resistance of AlSi10Mg samples produced by additive manufacturing. Finally, cryogenic conditions were also found to increase the amount of solid particle erosion wear.Bu tez çalışmasında, son yıllarda hızla yaygın kullanımı artarak havacılık, uzay, otomotiv, tarım, madencilik, medikal ve dişçilik gibi sektörlerde tercih edilen metal eklemeli imalat yöntemi ile üretilmiş AlSi10Mg alaşımlarının erozyon aşınma davranışları incelenmiştir. Eklemeli ve geleneksel imalat yöntemlerinin karşılaştırılabilmesi amacıyla deney numuneleri, toz temelli eklemeli imalat uygulaması olan seçici lazer ergitme yöntemi ve alüminyum enjeksiyon döküm yöntemiyle ürettirilmiştir. Tekrarlı testler için ürettirilen numunelerin bir grubuna ısıl işlem (T6) uygulanarak ısıl işlemin, erozyon davranışına etkisi araştırılmıştır. Partikül etkisinin erozyon deneylerinde etkisinin belirlenmesinde ~350 µm boyutuna sahip Silisyum Karbür (SiC) aşındırıcı partiküller kullanılmış olup farklı parametreler özelinde katı partikül erozyon aşınma sonuçlarına ulaşılmıştır. Aşındırıcı partiküllerin, hedef malzeme yüzeyine çarpma hızlarının belirlenebilmesinde hava akış hızı, sensör yardımıyla 60 m/s olarak bulunmuştur. Partiküllerin havaya karışma anındaki hızlarının tespiti içinde Ayrık Elemanlar Metoduna (AEM) bağlı simülasyonlarla, serbest düşme hızı yaklaşık 2,24 m/s olarak tespit edilmiştir. Simülasyon ve sensör yardımıyla ölçülen değerler, Euler'in Langerian Parçacık Takibi (LPT) akış modeliyle birleştirilerek, partiküllerin çarpma hızları teorik olarak ~25 m/s olarak hesaplanmıştır. Partikül çarpma hızı aynı zamanda çift disk metoduyla da ölçülerek teorik ve deneysel yakınsama sonuçlarına ulaşılmıştır. Katı partikül erozyon aşınma parametreleri arasında bir diğer önemli parametre olan çarpma açısı karşılaştırmalarında ise altı farklı çarpma açısından (15° ile 90° sabit artış) faydalanılmıştır. Deneyler oda sıcaklığında ve kriyojenik ortam şartlarında (≤–100°C) gerçekleştirilmiş olup kriyojenik ortam şartlarının sağlanabilmesi amacıyla belli gruptaki deney numunelerinin devar kabı özelliğini temsil etme yeteneğine sahip strafor kapalı hazne içerisinde sıvı azot (-196°C) ile kontrollü olarak teması sağlanarak sensör hassasiyeti ile kriyojenik şartlar doğrulanmıştır. Deneyler ASTM G76/G211 standartları yeteneğine sahip özel olarak tasarlanmış test cihazında gerçekleştirilmiş olup ağırlık kaybı verileri ile uluslararası literatür uyumluluğu önceliğinde alternatif imalat yöntemi, ısıl işlem etkisi karşılaştırmaları sonunda çarpma açısı – erozyon oranı grafikleri oluşturulmuştur. Deney numunelerinin erozyon aşınma davranışlarını anlamlandırmak ve istatiksel veri ortaya koymak adına korelasyon analizi uygulanmıştır. Deneylerden elde edilen sonuçların karşılaştırılması için ısıl işlem uygulanmamış eklemeli imalat numuneleri üzerinden Ansys Rocky DEM yazılımı ile ayrık elemanlar temelli simülasyon faaliyetleri yürütülerek simülasyona bağlı erozyon oranları hesaplanmış olup erozyon oranının tespitinde ilgili yazılımın çeşitli sınırlar dahilinde kullanışlı olabileceği anlaşılmıştır. Üç tekrarlı olacak şekilde tüm deneylerin tamamlanmasından sonra aşınmış numunelerin yüzeylerinden çeşitli büyültme ölçeklerinden SEM görüntüleri alınmış ve numunelere XRD analizi uygulanmıştır. Yüzey incelemeleri sonucunda, yüzeylerde yoğun olarak plastik deformasyona bağlı yüzey yapısının bozulduğu ve partiküllerle etkileşim sonucunda yüzeylerde çökmelere, partikül gömülmesine ve ezilme izlerine rastlanılmıştır. Ortaya çıkan yüzey hasarları, erozyon deneylerinden elde edilen sünek ve tam sünek malzeme karakteristiğini desteklemektedir. Bu tez çalışmasına ait çıktıların ortaya konulması kapsamında ise deneysel faaliyetlere ve simülasyon çalışmalarına bağlı olarak eklemeli imalat ile üretilmiş AlSiMg10 alaşımlarının katı partikül erozyon aşınma sonuçları açısından geleneksel imalatla üretilen yöntemlerden daha fazla erozyon direnci sağlayabildiği sonucuna varılmıştır. Ayrıca T6 ısıl işleminin özellikle eklemeli imalat ile üretilmiş AlSi10Mg numunelerin erozyon aşınma direncini de iyileştirdiği belirlenmiştir. Son olarak kriyojenik ortam şartlarının da katı partikül erozyon aşınma miktarını artırdığı verisine ulaşılmıştır
The Effects of Rural Gentrification Driven by Tourism: A Study in Case of Avanos
No full textIn today's literature, rural areas are redefined not only as low-populated areas dominated by agricultural production activities, but also as socially, economically and spatially fluid and variable areas. The urban-to-rural population mobility that causes this change is discussed under various concepts. One of these concepts is rural gentrification, which causes effects such as new urban residents settling in rural areas changing the demographic structure, perception and use of space, and local economic dynamics. Within the scope of this thesis, it is aimed to reveal the rural gentrification process that develops under the pressure of tourism in rural areas and the social, economic and spatial reflections of this process. In this direction, Avanos, which stands out with its morphological, cultural and historical features in the Cappadocia region, was determined as the study area and the traces, effects and experiences of the rural gentrification process in Avanos became the focus of the study. As a result of the information obtained from 36 interviewees in 8 different groups, data on the area and literature review, it has been observed that the demographic structure has changed, real estate prices have increased, the traditional structure has been re-functionalized and production activities have changed in Avanos. The findings on the process of change reveal that the process of rural gentrification has started in Avanos and that this process is progressing within the framework of controlled, balanced and protectionist criteria. The rural gentrification process in Avanos differs from the examples of the world and Turkey due to the limiting geography of the place and the protectionist structure guiding this process. This uniqueness of the area transforms Avanos into an important observation area in terms of examining the local relations of rural gentrification processes. The study, in this respect, reveals the existence of diverse transformation models in rural areasGünümüz literatüründe kırsal alanlar yalnızca tarımsal üretim faaliyetlerinin baskın olduğu düşük nüfuslu alanlar olarak değil; sosyal, ekonomik ve mekânsal olarak akışkan ve değişken alanlar olarak yeniden tanımlanmaktadır. Bu değişime neden olan kentten kıra yönelik nüfus hareketliliği çeşitli kavramlar altında tartışılmaktadır. Kırsal alanlara yerleşen kentli yeni sakinlerin bölgedeki demografik yapıyı, mekânı algılama ve kullanma durumunu ve yerel ekonomik dinamikleri değiştirmesi gibi etkilere neden olan kırsal soylulaştırma bu kavramlardan biridir. Tez kapsamında, kırsal alanlarda turizm baskısıyla gelişen kırsal soylulaştırma sürecini ve bu sürecin sosyal, ekonomik ve mekânsal yansımalarını ortaya koymak hedeflenmektedir. Bu doğrultuda Kapadokya bölgesinde morfolojik, kültürel ve tarihi özellikleri ile öne çıkan Avanos çalışma alanı olarak belirlenmiş ve Avanos'ta kırsal soylulaştırma sürecinin izleri, etkileri ve deneyimleri çalışmanın odak noktası olmuştur. Düzenlenen saha çalışmasında 8 farklı kategori üzerinde 36 görüşmeciden elde edilen bilgiler ve alana ilişkin veriler ve literatür taraması sonucunda Avanos'ta demografik yapının değiştiği, gayrimenkul fiyatlarının arttığı, geleneksel yapının yeniden işlevlendirildiği ve üretim faaliyetlerinin değiştiği gözlemlenmiştir. Değişim sürecine dair bulgular, Avanos'ta kırsal soylulaştırma sürecinin başladığını ve bu sürecin kontrollü, dengeli ve korumacı kriterler çerçevesinde ilerlediğini ortaya koymaktadır. Avanos'taki kırsal soylulaştırma süreci yerin sınırlandırıcı coğrafyası ve korumacı yapısının bu süreci yönlendirmesi nedeniyle Dünya ve Türkiye örneklerinden ayrışmaktadır. Alanın bu özgünlüğü, Avanos'u kırsal soylulaştırma süreçlerinin yerel ilişkilerinin incelenmesi açısından önemli bir gözlem alanına dönüştürmektedir. Çalışma, bu yönüyle kırsal alanlarda farklılaşan dönüşüm modellerinin varlığını ortaya koymaktadı
Alçak Gerilim Havai Elektrik Dağıtım Hatlarında Çıplak ve İzoleli Alüminyum İletkenlerin Tasarımı ve İzoleli Alüminyum İletkenin Uygulaması
No full textThis study was conducted to demonstrate the design of bare and insulated aluminum conductors and the application of insulated aluminum conductors in low voltage overhead power distribution lines. The research was prepared by taking the branch b of the distribution transformer located in Büyüköz neighborhood of Ahırlı district of Konya province as reference. The current status of the referenced transformer branch is shown and the designs of bare and insulated aluminum conductors on the existing line are made. The power density method is used in the design. At the same time, comparative economic, technical and safety analyzes of these conductors are given. As a result, although it is seen that bare aluminum conductors have more disadvantages than insulated aluminum conductors, bare and insulated aluminum conductors have been evaluated in all their aspects. This study will have an important place in the correct direction of the large investment budgets allocated for electricity distribution facilities.Bu çalışma, alçak gerilim havai elektrik dağıtım hatlarında çıplak ve izoleli alüminyum iletkenlerin tasarımı ve izoleli alüminyum iletkenin uygulamasını göstermek için yapılmıştır. Araştırma Konya ili Ahırlı ilçesi Büyüköz mahallesinde bulunan dağıtım trafosunun b kolu referans alınarak hazırlanmıştır. Referans alınan trafo kolunun mevcut durumu gösterilmiş olup mevcut hat üzerinde çıplak ve izoleli (yalıtılmış) alüminyum iletkenlerin tasarımları yapılmıştır. Tasarımda güç yoğunluğu yöntemi kullanılmıştır. Aynı zamanda bu iletkenlerin karşılaştırmalı olarak ekonomik, teknik ve güvenlik analizleri verilmiştir. Sonuç olarak çıplak alüminyum iletkenlerin, izoleli alüminyum iletkenlere nazaran olumsuzluklarının daha çok olduğu görülse de çıplak ve izoleli alüminyum iletkenler tüm yönleriyle değerlendirilmiştir. Bu çalışma elektrik dağıtım tesisleri için ayrılan büyük yatırım bütçelerinin doğru yönlendirilmesinde önemli bir yere sahip olacaktır
Appraisal of Inorganic and Lignocellulosic Organic Shell Wastes as a Green Filler in Epoxy-Based Hybrid Composites
No full textHybrid composites are now becoming increasingly important regarding economic and ecological compatibility. This study presented the research results that evaluate the feasibility of using cherry pit shell (CPSh) and chicken eggshell (ChESh) natural wastes as a new hybrid filler mixture for the first time. CPSh and ChESh can reduce the composite material cost and increase the biobased content. CPSh was treated with a 5 % NaOH alkali solution to enhance the lignocellulosic filler-matrix interfacial interaction. Hybrid green organic and inorganic fillers were used in the epoxy matrix (ER). Morphological, water absorption, thermal, and mechanical performance of hybrid composites were investigated. The tensile strength of ER increased max. by 5.73, 7.3, 17.98, and 14.27 % in the case of raw CPSh, ChESh, and hybrid filler mixtures at 1:1 and 1:3 wt mixing ratios of alkali-treated CPSh (NaOHCPSh) and ChESh, respectively. The composites' thermal stability and dynamic-mechanical properties in different aging environments (seawater and hydrothermal) were examined by thermogravimetric analysis (TGA) and dynamic-mechanical analysis (DMA). Hydrothermal was the most affected aging condition on the composite properties. In addition, ANOVA is applied to find the significant effect of different weight percentages of hybrid fillers on the mechanical properties of composites.The authors thank the Konya Technical University Scientific Research Foundation (Turkiye) for supporting the study (Project No: 241016011) .Konya Technical University Scientific Research Foundation (Turkiye) [241016011
Extended-Spectrum (Esbl)-Producing Escherichia Coli in Laying Hens: Slaughterhouse Prevalence and Antibiotic Resistance Patterns
No full textBackground: Laying hens, which are widely utilized for consumption and export in various regions, experience prolonged antibiotic exposure due to their longer lifespan, increasing the risk of antibiotic resistance and impacting the microbial environment of poultry slaughterhouses. Given the significance of extended-spectrum-beta-lactamase (ESBL)-producing Escherichia coli in food safety, this study aimed to investigate the prevalence of ESBL genes in E. coli isolated from a laying hen slaughterhouse in Konya, Turkey. Methods: Sampling was conducted using a convenient sampling approach, and a total of 150 samples were collected from a single slaughterhouse over six visits during both warm (June-August) and cold (January-March) seasons to evaluate seasonal variations. Samples were categorized into environmental sources (personnel, air, wastewater, eggs) and carcass-related sources (cloaca, carcasses at critical control points, final product). Classical cultural and molecular techniques and antimicrobial susceptibility tests were used for ESBL presence and gene characterization. For sequence analysis, the bidirectional Sanger Gene sequence analysis method was applied. Results: PCR-based detection identified 10 of the 17 isolates as E. coli by amplifying the uspA gene, and bidirectional Sanger sequencing further confirmed these isolates at the species level. The E. coli isolates were detected at various sampling areas, including personnel, carcasses after evisceration, and raw wastewater samples collected at different time points. In the multiplex PCR analysis, most ESBL isolates were positive for the blaCTX-M gene. The co-existence of blaTEM and blaCTX-M genes was detected in five samples. Additionally, three genes (blaSHV, blaCTX-M, and blaOXA) were identified in a carcass sample after evisceration. All ESBL-producing isolates harbored the blaCTX-M1 gene, and multiple antibiotic resistance was observed across all isolates. The presence of these genes was strongly associated with resistance to ampicillin, amoxicillin-clavulanic acid, aztreonam, cefepime, cefpodoxime, cefuroxime, and cephalothin, highlighting the critical role of blaCTX-M in driving the multidrug resistance patterns observed in this study. The highest resistance rate (80%) was observed in "personnel" and "carcass samples after evisceration", while all isolates remained sensitive to carbapenems (imipenem and meropenem). Conclusions: Our findings highlight the importance of the laying hen slaughter line as a potential source of contamination with ESBL-producing E. coli, which poses significant implications for food safety and public health. These findings underscore the need for improved control measures to mitigate ESBL E. coli transmission in poultry processing and highlight the importance of optimizing antibiotic use strategies in laying hen farming.This research was supported by the Konya Technical University Scientific Research and Project Coordination with the project number 202022057.Konya Technical University Scientific Research and Project Coordination [202022057]; Konya Technical University Scientific Researc
Virtual Reality Solutions for Troubleshooting Autonomous Industrial Mobile Robots
No full textThis study aims to develop a virtual reality (VR) application to improve the fault detection and troubleshooting processes of autonomous industrial mobile robots. The complex systems and operating environments of autonomous robots make fault detection challenging for users, requiring effective and user-friendly solutions to overcome these difficulties. In this context, the Robot Operating System (ROS) was utilized to detect errors in robots and record these errors in a database. Thanks to the modular structure and robust communication infrastructure offered by ROS, faults in the robots were monitored and analyzed through ROS topics. This study demonstrates the effective use of VR technology in the maintenance and repair processes of autonomous industrial mobile robots. By integrating ROS-based data collection and fault detection into a VR environment for user training, robot operators are enabled to troubleshoot faults more quickly and effectively. In this way, it is aimed to achieve time and cost savings in industrial processes
Demographic Analysis of Occupational Safety in the Construction Sector: Strategies and Insights for Risk Reduction
No full textThe construction sector is among the most dangerous industries, recognized for its significant rate of accidents with even more serious consequences, especially in developing countries. In addition to threatening the health and living conditions of workers, occupational accidents also negatively impact work productivity and sustainability. In this context, a country-by-country analysis of occupational accidents in the sector is critical to understand local demographic differences better and determine the impact of workplace safety practices. In parallel with the growing economy, the construction sector in T ; uuml;rkiye creates a large employment area and stands out as one of the sectors where occupational accidents occur most frequently. This study aims to analyze the interactions of occupational accidents and incapacity with demographic factors in the construction sector in T ; uuml;rkiye. This study analyzes the demographic factors, including age, gender, marital status, education, and work experience, of workers involved in occupational accidents within the construction industry between 2018 and 2022. As a result, it is found that young (18-27 years), male, single, and less experienced (1-10 years) workers are more prone to occupational accidents while increasing age and education level increases the risk of incapacity caused by occupational accidents. As experience increases, the probability of occupational accidents decreases; however, the recovery period is longer for workers who are exposed to heavy working conditions for a long time. The results show that the probability and severity of occupational accidents differ according to demographic characteristics. Therefore, high-risk workers should be identified, and occupational safety policies should be restructured based on this data. This study provides an important guide for policy changes and practical applications for demographically oriented restructuring of occupational safety measures in the construction industry.The author appreciates the Social Security Institution of Turkiye for supporting this research.Social Security Institution of Turkiy
Enhancing Efficiency and Power Quality in Grid-Connected Photovoltaic Systems Based on Linear Matrix Inequality Methodology
No full textThis study presents an innovative control approach for enhancing the efficiency and power quality of grid-connected photovoltaic (PV) systems using linear matrix inequality (LMI) techniques. The primary objective is to develop a robust maximum power point tracking (MPPT) controller that ensures maximum energy extraction under varying solar irradiation conditions while improving the stability and reliability of power transfer to the grid. The system architecture comprises PV panels connected to a boost converter, managed by the LMI-based MPPT and a three-phase bidirectional converter that enables bidirectional power flow between the grid and the load. This work contrasts the performance of the proposed LMI method with the traditional sliding mode control (SMC), addressing the limitations of SMC, such as the chattering phenomenon and reduced efficiency under dynamic conditions. Key objectives include achieving superior power tracking accuracy, minimizing total harmonic distortion (THD) in the grid current, and ensuring smooth voltage regulation. Simulations demonstrate that the LMI-based MPPT controller delivers 2-3% higher power output compared to SMC across various solar irradiation scenarios, including rapid fluctuations and partial shading. The LMI methodology also significantly reduces THD by 20-30%, enhancing the power quality and ensuring compliance with grid standards. Additionally, the LMI control strategy eliminates the chattering effect observed in SMC, resulting in smoother control dynamics and improved system stability. These findings underscore the potential of the LMI approach to optimize energy harvesting, improve grid compatibility, and provide a reliable solution for modern PV systems, contributing to the advancement of sustainable energy technologies.This work was supported by the General Directorate of Scientific Research and Technological Development (DGRSDT), the body affiliated to the Algerian Ministry of Higher Education and Scientific Research.General Directorate of Scientific Research and Technological Development (DGRSDT
Identifying Unsafe Locations for Pedestrians in Konya With Spatio-Temporal Analyses
No full textIdentifying the locations of pedestrian crashes in cities contributes to the full implementation of sustainable transportation for all road users. This study examines the pedestrian crash data of Konya, T ; uuml;rkiye, from 2017 to 2022. First, the dangerous and safe road networks in Konya province were identified. Then, spatial and temporal analyses were performed. Kernel density estimation analysis was used to identify five critical locations with high pedestrian crash density. Hotspot analysis was used to identify roads where crashes showed clustering characteristics. Buffer analysis was used to analyse the effectiveness of traffic lights in preventing crashes and three locations where traffic lights were inadequate in preventing crashes were identified. According to the temporal evaluation, pedestrian crashes increased the most at 8 am and 6 pm. Locations where the number of crashes decreased over time were identified by examining the temporal changes in pedestrian crashes using space-time cube analysis. This study highlights the positive effects of improvements in the pedestrian environment on pedestrian safety. New hotspots have emerged in several areas. Therefore, this approach is valuable for early prevention. With the methodology used in the study, the locations of pedestrian crashes and the cause-and-effect relationships of crashes can be evaluated.The author appreciates the Turkish National Police Traffic Presidency for supporting this research.Turkish National Police Traffic Presidenc