Atılım Academic Archive (Atılım University)
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Organic Waste as a Soundproofing Material: an Experimental Study
No full textKöse, Ercan/0000-0001-9814-6339; BAL KOCYIGIT, Filiz/0000-0003-4191-0724Using sound insulation materials that do not impair indoor air quality and do not emit carbon.Increasing the sound insulation capacity with combinations of different natural materials.To enable to increase the intensity of use thanks to its economical production. Objective The aim of the study is to develop new acoustic materials and panels that high sound transmission loss (STL), low carbon emissions, high sensitivity to human health, and also do not harm the indoor air quality. These materials are currently grown in Turkey and can be easily adopted in the industry. It has been comparatively analyzed that the developed materials can be alternatives to the synthetic materials on the market.Methods In the experiment box similar to Alpha Cabin, which was designed and developed before, the STL values were obtained by conducting experiments in the frequency range 500-8000 Hz. with many natural and synthetic materials. In the study, low carbon emission natural materials with a STL of more than 30 dB were selected.Simulation The experimentally measured samples were simulated in the acoustic module of the ANSYS program and compared with the results.Conclusion The main purpose of choosing cones and walnut shells grown in our country is to contribute to the amount of oxygen in the atmosphere and green areas by increasing the cultivation of pine and walnut trees. In the tests of the samples, it was determined that the highest STL was 63.27 dB in the concave and egg-shaped sample, and 62.41 dB in the concave walnut shell and egg form. It is envisaged that the materials we obtained can be used in the sound insulation of machines and devices that produce 85 dB and above sound harmful to human health according to ILO and WHO standards.Tarsus UniversityNo Statement Availabl
Formation of Industrial Design Culture from Educational to Professional Life
No full textAlthough the professional culture of designers has been emphasized as a peripheral issue in various fields of study in design, such as design culture and design management, it has rarely been the central topic of research. However, studies from other professional fields have demonstrated the significance of studying professional culture, especially its formation in higher educational contexts, as it has direct implications on professional status and career prospects of these professions' members. This paper aims to redress this gap by exploring how the professional culture acquired in industrial design education shapes industrial designers’ work experiences in manufacturing companies? It focuses on the context of Turkey and empirically draws on interviews with industrial designers who have work experience in large-scale manufacturing companies. Interviews reveal insights into industrial designers’ perceptions of the profession, experiences in undergraduate education, adaptations to professional life, and professional experiences in manufacturing companies where they collaborate with other professions, where cultural disconnect becomes visible. The qualitative data analysis highlighted the significance of being a community and having flexibility in space and time in industrial design’s professional culture in the examined context. The findings underline collaboration and teaching of soft skills such as communication and teamwork as implications for industrial design education. © 2024, The Design and Technology Association. All rights reserved
On Interpolative Metric Spaces
No full textThe purpose of this article is to expand the "open discussion" on the definition and necessity of the interpolation metric space and keep it on the agenda of researchers in nonlinear functional analysis. The secondary aim of this article is to indicate that the outcomes of this "open discussion" have the potential to stop the recent recession in the metric fixed point theory.Science Citation Index Expande
Barriers To Bim Implementation in Sustainable Building Projects in Türkiye
No full textAs the construction industry is a major contributor to greenhouse gas emissions, sustainable building projects play a vital role in mitigating its harmful environmental impact. Building energy analysis is particularly important for sustainable projects. Building Information Modeling (BIM), which enables comprehensive data management and analysis throughout the building lifecycle, has emerged as an indispensable tool at every stage of sustainable building projects. This study aims to investigate the barriers hindering the implementation of BIM in sustainable building projects in Türkiye. For this purpose, potential barriers were initially identified through literature searches in databases such as Scopus and Web of Science. Following the literature review, a structured questionnaire was designed to evaluate the significance of 18 identified barriers on the use of BIM technology in green buildings. The results indicate that significant impediments include financial barriers such as high licensing costs, the high costs of BIM experts, and high training costs. The findings highlight the critical need for support mechanisms to facilitate the broader adoption of BIM in sustainable construction practices. © 2024 International Conference on Construction in the 21st Century. All rights reserved
Investigation of the Combined Effects of Ultrasonic Vibration-Assisted Machining and Minimum Quantity Lubrication on Al7075-T6
No full textThe aluminum alloy Al7075-T6 finds extensive application in the aviation and automotive industries, where machining plays a pivotal role. Emerging techniques such as Ultrasonic Vibration-Assisted Machining (UVAM) and Minimum Quantity Lubrication (MQL) hold promise for enhancing machining efficiency. In this study, the combined use of UVAM and MQL for slot milling of Al7075-T6 was investigated. The results demonstrate that UVAM reduced cutting forces by an average of 10.87% in MQL and 8.31% in Conventional Cutting Fluid (CCF) conditions when compared to Conventional Machining (CM). In addition, UVAM yielded significantly improved surface finishes, characterized by an average reduction in surface roughness of 41.86% in MQL and 32.11% in CCF conditions relative to CM. Furthermore, surfaces subjected to UVAM exhibited fewer instances of burn marks and tool-induced markings, reduced chip splashing, and more uniform surface integrity compared to those manufactured with CM. Lastly, chips generated through UVAM exhibited distinct characteristics, notably shorter length, curvier shape, and a distinctive half-turn morphology when compared with the irregular chips produced through CM. In conclusion, our findings underscore the potential of UVAM in synergy with MQL to augment the machining of Al7075-T6 alloy, thereby yielding superior-quality machined components with enhanced operational efficiency. © 2025 Elsevier B.V., All rights reserved
Advancing Mmwave Altimetry for Unmanned Aerial Systems: a Signal Processing Framework for Optimized Waveform Design
No full textKara, Ali/0000-0002-9739-7619This research advances millimeter-wave (mmWave) altimetry for unmanned aerial systems (UASs) by optimizing performance metrics within the constraints of inexpensive automotive radars. Leveraging the software-defined architecture, this study encompasses the intricacies of frequency modulated continuous waveform (FMCW) design for three distinct stages of UAS flight: cruise, landing approach, and touchdown within a signal processing framework. Angle of arrival (AoA) estimation, traditionally employed in terrain mapping applications, is largely unexplored for UAS radar altimeters (RAs). Time-division multiplexing multiple input-multiple output (TDM-MIMO) is an efficient method for enhancing angular resolution without compromising the size, weight, and power (SWaP) characteristics. Accordingly, this work argues the potential of AoA estimation using TDM-MIMO to augment situational awareness in challenging landing scenarios. To this end, two corner cases comprising landing a small-sized drone on a platform in the middle of a water body are included. Likewise, for the touchdown stage, an improvised rendition of zoom fast Fourier transform (ZFFT) is investigated to achieve millimeter (mm)-level range accuracy. Aptly, it is proposed that a mm-level accurate RA may be exploited as a software redundancy for the critical weight-on-wheels (WoW) system in fixed-wing commercial UASs. Each stage is simulated as a radar scenario using the specifications of automotive radar operating in the 77-81 GHz band to optimize waveform design, setting the stage for field verification. This article addresses challenges arising from radial velocity due to UAS descent rates and terrain variation through theoretical and mathematical approaches for characterization and mandatory compensation. While constant false alarm rate (CFAR) algorithms have been reported for ground detection, a comparison of their variants within the scope UAS altimetry is limited. This study appraises popular CFAR variants to achieve optimized ground detection performance. The authors advocate for dedicated minimum operational performance standards (MOPS) for UAS RAs. Lastly, this body of work identifies potential challenges, proposes solutions, and outlines future research directions.Science Citation Index Expande
Prognostic Implications and Predictors of Mitral Regurgitancy Reduction After Transcatheter Aortic Valve Implantation
No full textBackground: Mitral regurgitation (MR) is a common condition observed in patients undergoing transcatheter aortic valve implantation (TAVI) for the treatment of aortic stenosis (AS). However, the impact of TAVI on MR outcomes and the factors predicting MR improvement remains uncertain. Understanding these predictors can enhance patient management and guide clinical decisions. Methods: This retrospective cohort study included 156 patients with moderate to severe MR undergoing TAVI. MR severity was assessed via echocardiography at baseline, as well as 6 months and 1 year after TAVI. Patients were divided into groups based on MR reduction: no improvement or worsening, one-degree improvement, and at least two-degree improvement. Clinical, echocardiographic, and procedural characteristics were evaluated as predictive factors for MR improvement after TAVI. Results: MR reduction occurred in 68% of patients at 6 months and 81% at 1 year. Factors predicting a reduction of two grades or more in MR severity included lower baseline LVEDD (OR = 1.345, 95% CI: 1.112-1.628, p = 0.002) lower baseline LA (OR = 1.121, 95% CI: 1.015-1.237, p = 0.024), lower baseline LVMI (OR = 1.109, 95% CI: 1.020-1.207, p = 0.024), and higher baseline EF levels (OR = 1.701, 95% CI: 1.007-2.871, p = 0.047). No significant association was found between MR reduction at 6 months and one-year mortality. (p = 0.65). Conclusions: Baseline echocardiographic parameters are valuable in predicting MR improvement post-TAVI, with LVMI emerging as a novel predictor. However, MR reduction did not independently predict survival, underscoring the need for further research to optimize patient selection and management strategies in TAVI candidates.Science Citation Index Expande
Reconstructing Energy-Efficient Buildings After a Major Earthquake in Hatay, Türkiye
Get PDFT & uuml;rkiye's earthquake zone, primarily located along the North Anatolian Fault, is one of the world's most seismically active regions, frequently experiencing devastating earthquakes, such as the one in Hatay in 2023. Therefore, reconstructing energy-efficient buildings after major earthquakes enhances disaster resilience and promotes energy efficiency through retrofitting, renovation, or demolition and reconstruction. To this end, this study proposes implementing energy-efficient design solutions in dwelling units to minimize energy consumption in new buildings in Hatay, Southern Turkiye, an area affected by the 2023 earthquake. This research focused on a five-story residential building in the district of Kurtlusar & imath;maz & imath;, incorporating small-scale Vertical-Axis Wind Turbines (VAWTs) with thin-film photovoltaic (PV) panels, along with the application of a green wall surrounding the building. ANSYS Fluent v.R2 Software was used for a numerical investigation of the small-scale IceWind turbine, and DesignBuilder Software v.6.1.0.006 was employed to simulate the baseline model and three energy-efficient design strategies. The results demonstrated that small-scale VAWTs, PV panels, and the application of a green wall reduced overall energy use by 8.5%, 18%, and 4.1%, respectively. When all strategies were combined, total energy consumption was reduced by up to 28.5%. The results of this study could guide designers in constructing innovative energy-efficient buildings following extensive demolition such as during the 2023 earthquake in Hatay, T & uuml;rkiye.Science Citation Index Expande
Özofagus Atrezisinde Uzun Vadeli Sonuçlar: Beslenme Yönetimi ve Büyüme-Gelişme
No full textBu derlemenin amacı, özofagus atrezili hastalarda beslenme yönetimi, malnütrisyon ve büyüme-gelişme durumunu, çeşitli çalışmalar ve mevcut literatür temelinde özetlemektir. Özoagus atrezisi, trakeoözofageal fistüllü veya fistülsüz, özofagusun devamlılığının olmaması ile karakterize konjenital bir malformasyon olarak tanımlanmaktadır. Cerrahi tedavi; özofagus kesintisini düzeltmek ve varsa trakeoözofageal fistülü bağlamak ve bölmek amacıyla uygulanmaktadır. Günümüzde, ciddi ilişkili anomalilerle birlikte özofagus atrezisi ile doğanlarda sağkalım oranı ~%90'a ulaşmıştır ve tek başına özofagus atrezisi ile doğanlarda bu oran daha da yüksek olmaktadır. Ancak, bu başarılara rağmen, özofagus atrezisi ile doğan hastalarda uzun vadeli gastrointestinal ve solunum komplikasyonları, komorbiditeler yaygındır ve bu durum hastanın yaşam kalitesini olumsuz etkilemektedir. Cerrahi müdahale sonrası hastalarda beslenme güçlüğü sık gözlenmekte; özofagus atrezisinin uzun dönemli negatif etkileri, çocuklarda beslenme durumunun bozulmasına ve büyüme geriliğine neden olabilmektedir. Kusma, öksürme, boğulma gibi devam eden olumsuz olaylar, beslenme becerilerini olumsuz etkileyebilir, çocukların beslenmeye olan ilgilerini azaltabilir ve zamanla davranışsal faktörlerle devam eden beslenme güçlüklerine dönüşebilir. Yetersiz beslenen özofagus atrezili çocuklarda malnütrisyon sık gözlenmektedir ve bu çocukların sağlıklı büyümesini sağlamak için beslenme sorunlarının doğru yönetimi kritik önem taşımaktadır
The psychometric properties of the Turkish version of the Pre-sleep Arousal Scale
No full textTürkarslan, Kutlu Kağan/0000-0002-2440-3977PurposeThe aim of the present study was to examine the psychometric properties of the Turkish version of the Pre-sleep Arousal Scale (PSAS), which measures pre-sleep arousal, a significant predictor of insomnia symptoms.Methods651 participants were recruited via social media and the Internet. Confirmatory factor analysis was conducted in the total sample (65.28% females; M-age1 = 28.09 & PLUSMN; 14.00). Convergent, divergent, incremental, and known-groups validity and internal consistency coefficients were assessed in a subsample of 556 participants (62.77% females; M-age2 = 29.25 & PLUSMN; 14.81). A second separate sample of 88 participants (80.68% females; M-age3 = 22.19 & PLUSMN; 4.98) was used to evaluate three-week test-retest reliability.ResultsThe results of factor analysis confirmed the two-factor structure of the Turkish PSAS with cognitive (PSAS-C) and somatic (PSAS-S), similar to the original scale. The correlations of the PSAS with convergent and divergent measures showed that the Turkish form had good convergent and acceptable divergent validity. PSAS-C and PSAS-S were able to explain an 18% additional variance in insomnia severity beyond depression and anxiety, an 18% additional variance in depression beyond insomnia severity, and a 35% additional variance in anxiety beyond insomnia severity. Moreover, insomnia patients had significantly higher PSAS-C and PSAS-S scores than good sleepers. Finally, the PSAS, PSAS-C, and PSAS-S had satisfactory internal consistency coefficients (& alpha; = 0.92, 0.91, and 0.86, respectively) and three-week test-retest correlations (ICC = 0.82, 0.82, and 0.71, respectively).ConclusionThe Turkish form of the PSAS was a valid and reliable measure of pre-sleep arousal and can be utilized in sleep studies