DSpace@ATÜ (Adana Alparslan Türkeş Bilim ve Teknoloji Universiti)
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Deneysel uygulamalar ile aktif bozucu bastırma kontrolü tekniklerinin tasarımı ve analizi
No full textLisansüstü Eğitim Enstitüsü, Elektrik-Elektronik Mühendisliği Ana Bilim DalıBu tez, bir dizi deneysel uygulama ile aktif bozucu bastırma kontrol tekniklerinin tasarımını ve analizini incelemeyi amaçlamaktadır. Bu çalışmanın temel amacı, çeşitli ileri kontrol stratejilerinin gerçek dünya senaryolarında nasıl etkin bir şekilde uygulanabileceğini ve performanslarının nasıl sistematik bir şekilde değerlendirilebileceğini keşfetmektir. Tez, aktif bozucu bastırma yöntemlerinin geliştirilmesi ve deneysel doğrulama sürecini ayrıntılı bir şekilde incelemektedir. Bu yöntemlerin pratik kullanılabilirliğini ve etkinliğini anlamak için detaylı bir şekilde tasarım, parametre ayarlama ve farklı senaryolarda test edilmesi planlanmıştır. Deney platformu olarak endüstriyel uygulamalarda sayısız alanda kullanılan elektromekanik sistem seçilmiştir. Sistemin matematiksel ve parametrik modeli gerçek zamanlı sistem tanılama deneyleri ile elde edilmiştir. Bu araştırmanın temel katkılarından biri, endüstriyel süreçlerde doğrusal aktif bozucu bastırma kontrolünün uygulanabilirliği ve etkinliği hakkında aydınlatıcı bilgiler sunmasıdır. Çalışma, değerlendirme için çeşitli performans metriklerini kullanılarak, geçici durum performansının ve sürekli durum hatalarının incelenmesine odaklanmıştır. Bu tezin önemli bir diğer yönü, kesir dereceli doğrusal bozucu bastırma yöntemlerinin tanıtılması ve deneysel doğrulamasını içermesidir. Bu yenilikçi yaklaşım ve deneysel doğrulama, bilgi sınırlarını genişletmekte ve mühendislik uygulamaları ile kontrol sistemlerinin geliştirilmesine katkıda bulunmaktadır. Sonuç olarak, bu yüksek lisans tezi, mühendislik uygulamaları ve kontrol sistemleri alanındaki gelişmiş bir araştırma çabasını temsil etmektedir. Anahtar Kelimeler:. Gözleyici Tabanlı Kontrol, Aktif Bozucu Bastırma Kontrolü, Lineer Aktif Bozucu Bastırma Kontrolü, Dahili Model KontrolüThis thesis is intended to explore the design and analysis of active disturbance rejection control techniques through a series of experimental applications. The fundamental objective of this study is to investigate how various advanced control strategies can be effectively applied in real-world scenarios and how their performances can be systematically assessed. The thesis meticulously examines the development and experimental validation process of active disturbance rejection methods. The practical utility and effectiveness of these methods are planned to be comprehensively understood through detailed design, parameter tuning, and testing in various scenarios. As the experimental platform, electromechanical system has been chosen which is widely used in numerous industrial applications. The mathematical and parametric model of the system has been obtained through real-time system identification experiments. One of the primary contributions of this research is to provide enlightening insights into the applicability and effectiveness of linear active disturbance rejection control in industrial processes. The study is focused on the examination of transient state performance and steady-state errors, employing various performance metrics for evaluation. Another significant aspect of this thesis is the introduction and experimental validation of fractional-order linear disturbance rejection methods. This innovative approach and its experimental verification are expected to expand the boundaries of knowledge and contribute to the improvement of engineering applications and control systems. In conclusion, this master thesis represents an advanced research endeavor in the field of engineering applications and control systems. Keywords: Active Disturbance Rejection Control, Internal Model Control, Linear Active Disturbance Rejection Control, Observer-Based Contro
Slime Mould Algorithm: A Comprehensive Survey of Its Variants and Applications
No full textMeta-heuristic algorithms have a high position among academic researchers in various fields, such as science and engineering, in solving optimization problems. These algorithms can provide the most optimal solutions for optimization problems. This paper investigates a new meta-heuristic algorithm called Slime Mould algorithm (SMA) from different optimization aspects. The SMA algorithm was invented due to the fluctuating behavior of slime mold in nature. It has several new features with a unique mathematical model that uses adaptive weights to simulate the biological wave. It provides an optimal pathway for connecting food with high exploration and exploitation ability. As of 2020, many types of research based on SMA have been published in various scientific databases, including IEEE, Elsevier, Springer, Wiley, Tandfonline, MDPI, etc. In this paper, based on SMA, four areas of hybridization, progress, changes, and optimization are covered. The rate of using SMA in the mentioned areas is 15, 36, 7, and 42%, respectively. According to the findings, it can be claimed that SMA has been repeatedly used in solving optimization problems. As a result, it is anticipated that this paper will be beneficial for engineers, professionals, and academic scientists
Internet of Things and Wireless Sensor Networks for Smart Agriculture Applications: A Survey
No full textThe increasing food scarcity necessitates sustainable agriculture achieved through automation to meet the growing demand. Integrating the Internet of Things (IoT) and Wireless Sensor Networks (WSNs) is crucial in enhancing food production across various agricultural domains, encompassing irrigation, soil moisture monitoring, fertilizer optimization and control, early-stage pest and crop disease management, and energy conservation. Wireless application protocols such as ZigBee, WiFi, SigFox, and LoRaWAN are commonly employed to collect real-time data for monitoring purposes. Embracing advanced technology is imperative to ensure efficient annual production. Therefore, this study emphasizes a comprehensive, future-oriented approach, delving into IoT-WSNs, wireless network protocols, and their applications in agriculture since 2019. It thoroughly discusses the overview of IoT and WSNs, encompassing their architectures and summarization of network protocols. Furthermore, the study addresses recent issues and challenges related to IoT-WSNs and proposes mitigation strategies. It provides clear recommendations for the future, emphasizing the integration of advanced technology aiming to contribute to the future development of smart agriculture systems
Does Islamic banking reduce the risks of COVID-19 for SMEs? Novel evidence for SME financing in the pandemic period for an emerging market
No full textThis paper aims to examine the effect of COVID-19 on SME bank lending in the Islamic banking sector to small and medium-sized enterprises (SMEs) in an emerging market: Turkey. Under-standing whether SME bank lending in the Islamic banking sector is procyclical or not is very important to reduce the impact of COVID-19 on SMEs. Interrupted time series analysis (ITSA), the Markov switching regression model, and vector autoregressive (VAR) methodologies are employed using novel weekly data for the pandemic period. The present study finds that the Islamic banking sector for SME financing has behaved countercyclically during COVID-19 in the Turkish economy. The paper thus sheds new light on the relationship between Islamic bank lending for SME financing and the COVID-19 shock in an important emerging market. The findings can provide insights into how Islamic banks mitigate the effect of COVID-19 on SMEs in an emerging market context. The present paper clearly shows differences between Islamic bank lending toward SMEs and deposit bank lending toward SMEs in the pandemic era. The willingness of Islamic banks to supply loans to SMEs during the pandemic plays a vital role in reducing SME firm failure in the Turkish economy
How precarious are the working conditions of literary translators? A sociology of translation perspective from Türkiye
No full textStudies on the working conditions of literary translators to date reveal that literary translators frequently complain about their working conditions. The present article investigates how Turkish literary translators are affected by precarious working conditions, based on interviews with agents from the publishing industry, including literary translators, editors, and publishers. The research involved semi-structured interviews with 28 participants. The results show that literary translators face five types of precarity: a lack of legal control mechanisms, job insecurity, lack of social security, uncertainty about the future, and income insecurity. However, literary translators’ desire to translate literary works broadly takes precedence over their intention to leave the profession. Most of the participants offered solutions to these problematic working conditions, such as solidarity, bargaining, royalties, doing side jobs or translating as a hobby. The study suggests a new avenue for future research to analyse literary translation as a form of labour and encourages sustainable solutions for literary translators in Türkiye and around the world. © 2023, University of Geneva. All rights reserved
Effect of Crosslinking Agent on Mesoporous Spherical POSS Hybrid Particles: Synthesis, Characterization and Thermal Stability
No full textThis work reports the synthesis of two novel polyhedral oligomeric silsesquioxane (POSS) hybrid particles by investigating the effects of different crosslinking agents on morphology, porosity, chemical structure, crystalline properties, and thermal behavior of the resultant products. The hydrophilic glycerol dimethacrylate and hydrophobic ethylene glycol dimethacrylate (EGDMA) were used as co-monomer and crosslinking agents to obtain novel poly(POSS-co-GDMA) and poly(POSS-co-EGDMA) hybrid spherical microparticles by step-wise Pickering-like seeded polymerization. The crosslinking agent played a key role in specific surface area (SSA), average pore size, and pore volume, characterized by Brunauer-Emmett-Teller and Barrett-Joyner-Halenda analysis. When poly(POSS-co-GDMA) possess 88.0m(2)/g SSA, poly(POSS-co-EGDMA) has 3.5m(2)/g. Both particles exhibit a homogenous spherical shape in the polydisperse form and hybrid organosilica structure defined by scanning electron microscope, energy-dispersive X-ray spectroscopy, Fourier-transform infrared spectroscopy. The hybrid particles showed an amorphous silica composite character with thermal resistance up to 420 ?, determined by X-ray diffraction and thermogravimetric analysis. The mesoporous hybrid POSS particles could have great potential for many advanced material applications.(GRAPHICS)Turkish Fulbright Commission; Fulbright Postdoctoral Scholarship; Scientific and Technological Research Council of Turkey [TUBITAK 2219, 1059B191801017]Thanks to the Turkish Fulbright Commission for a Fulbright Postdoctoral Scholarship and The Scientific and Technological Research Council of Turkey (TUBITAK 2219 Postdoctoral Award #1059B191801017) for Dr. Gunes Kibar
Physical, Chemical, Barrier, and Antioxidant Properties of Pectin/Collagen Hydrogel-Based Films Enriched with Melissa officinalis
No full textThe essential oil extracted from Melissa officinalis (MOEO) exhibits a wide range of therapeutic properties, including antioxidant, antibacterial, and antifungal activities. The current research aimed to analyze the mechanical, barrier, chemical, and antioxidant properties of pectin and collagen-based films. Hydrogel-based films loaded with varying concentrations of MOEO (0.1%, 0.15%, and 0.2%) were prepared by solvent-casting method, and their physicochemical as well as antioxidant properties were examined. GC-MS analysis revealed the presence of major components in MOEO such as 2,6-octadienal, 3,7-dimethyl, citral, caryophyllene, geranyl acetate, caryophyllene oxide, citronellal, and linalool. Fourier transform infrared (FTIR) results revealed the interaction between components of the essential oil and polymer matrix. Scanning electron microscopy (SEM) revealed that films loaded with the highest concentration (0.2%) of MOEO showed more homogeneous structure with fewer particles, cracks, and pores as compared to control film sample. MOEO-incorporated films exhibited higher elongation at break (EAB) (30.24-36.29%) and thickness (0.068-0.073 mm); however, they displayed lower tensile strength (TS) (3.48-1.25 MPa) and transparency (87.30-82.80%). MOEO-loaded films demonstrated superior barrier properties against water vapors. According to the results, the incorporation of MOEO into pectin-collagen composite hydrogel-based films resulted in higher antioxidant properties, indicating that MOEO has the potential to be used in active food packaging material for potential applications.Ministry of Education; Abdulaziz University, DSR, Jeddah, Saudi Arabia& nbsp;& nbsp;The authors gratefully acknowledge the technical and financial support provided by the Ministry of Education and Abdulaziz University, DSR, Jeddah, Saudi Arabia. The authors are also thankful to the Natural and Medical Sciences Research Center, University of Nizwa, Oman, for providing the research facilities used to conduct the current study
The chip crisis and its effect on capital structure dynamics of automobile firms during the pandemic
No full textThis study examines the impact of chip shortages on the financial leverage of automobile firms worldwide over the period COVID-19 using a panel vector autoregression analysis. This paper analyzes the chip crisis as an exogenous shock in a highly heterogeneous and dynamic framework for automobile firms during the pandemic period. The findings show that the chip shortage has a negative effect on financial leverage of automobile firms and increases their internal financing needs during the pandemic. This study adds new insights to the current literature by considering the chip crisis to the corporate dynamics of automobile firms
Predictors of domain-specific and global life satisfaction across the first half of life: which domains of life satisfaction are the most important for global life satisfaction?
No full textWhile there have been several recent studies putting forward different predictors and outcomes of life satisfaction in various life domains, most have addressed life satisfaction as a whole, with only a handful investigating in detail life satisfaction in specific life domains. Based on a sample of 217 adults in the first half of life in Turkey (M-age = 23.85 years, SD = 5.75), the present study firstly explores predictors of life satisfaction as a whole and in six specific domains (i.e., satisfaction with social, health, financial, leisure, work and residence status), and then examines the unique contributions of the domain-specific areas to global life satisfaction. Adopting a 'bottom-up' approach, this study assesses the general self-efficacy, perceived social support, perceived control, global life satisfaction and satisfaction associated with various life domains, as well as the sociodemographic information of the participants. The findings reveal perceived social support and income level to be the most consistent predictors of global and domain-specific life satisfaction. Furthermore, after controlling for sociodemographic and psychological factors in a regression analysis based on beta values, financial, work, residence and social satisfaction made a marginally significant contribution to the enhancement of global life satisfaction. More importantly, there was no statistically significant difference between the contributions of these variables to global life satisfaction. The present study contributes to the existing body of literature on life satisfaction in demonstrating that individual domains of life satisfaction may be considered new targets for interventions aimed at increasing subjective well-being and life satisfaction
I plik boya proseslerinde atik suyun yeniden kullanılması
No full textFen Bilimleri Enstitüsü, Nanoteknoloji ve Mühendislik Bilimleri Ana Bilim DalıSu tüketiminin yüksek olduğu tekstil boya endüstrisinde, atık suyun uygun geri kazanım yöntemleriyle arıtılarak yeni boyamalarda kullanılması ve böylece karbon ayak izi ve su ayak izinin azaltılması hedeflenmektedir. Ülkemizde tekstil boya sanayi çok geniş bir alana yayılmaktadır ve su tüketimi fazladır. Bu nedenle, belirli iplik türleri için atık suyun yeniden kullanılması, su tüketimini önemli ölçüde azaltacaktır. Tekstil boyahanelerinde ürünlerin boyanması, boyama prosesine göre 3-15 banyodan oluşabilmekte ve bu banyoların tamamında temiz su kullanılmaktadır. Dolayısıyla her aşamada atık su oluşmaktadır. Bu atık sular, tekrar kullanılmamak üzere atık su havuzuna gönderilmektedir. Viskon, pamuk, akrilik, polyester ve naylon gibi boya prosesleri incelendiğinde farklı sayıda banyolar ile boyanmaktadır. Ayrıca verilen boyarmaddelerin boya oranları da birbirinden farklıdır. Örneğin; akriliğin boyanması sonucu banyoda kalan su incelendiğinde berrak bir su görülürken viskon/pamuk için durum tam tersidir. Bu aşamada, her boya prosesinde oluşan atık su numuneleri uygun yöntemlerle analiz edilebilir ve belirli iplik türlerinin boyanmasında tekrar kullanılabilir. Atık suyun içeriğine göre arıtma prosesleri uygulanarak British Textile Technology Group ve Goodman and Porter tekstil atık suları geri kullanım kriterlerine getirilmesi ya da maksimum seviyede arıtılabilmiş olan atık suyun boyama veya boya sonrası yıkama banyolarında %100'e yakın performans ile boyama prosesine entegre edilmesi gerçekleştirilebilir. Dünyadaki temiz su kaynağının %20'sinin tekstil endüstrisinde kullanıldığı ve bir kilogram tekstil ürünü üretmek için 100 litreye kadar su gerektiği düşünülmekte olup, bu doğrultuda tekstil boyahanelerindeki yüksek su tüketiminin azaltılması için çevre dostu yöntemlerin uygulanmasıyla atık suların tekrar kullanımı hedeflenerek, tekstil boyahanesinde kullanılan günlük su tüketiminin minimuma indirilmesi amaçlanmaktadır. Bu tez yazısında, diğer elyaf türlerine oranla nispeten daha kolay boyanabilen akrilik (katyonik boyama) ve pamuk (reaktif boyama) üzerinde araştırmalar yapılmıştır. Günde 100 ton su tüketimi olan bir tesis için suyun %30'unun geri dönüşüm havuzuna deşarj edilmesi ve deşarj edilen suyun tamamının tekrar boyamalarda kullanılması hedeflenmektedir. Anahtar Kelimeler: İklim Değişikliği, Tekstil Boyama, Atık Su, Geri Kazanım, Karbon AyakiziIn the textile dyeing industry where water consumption is high, the aim is to reduce carbon and water footprint by treating wastewater with appropriate recovery methods and using it in new dyeings. The textile dyeing industry is widespread in our country and water consumption is high. Therefore, reusing wastewater for certain types of yarn will significantly reduce water consumption. The dyeing of products in textile dyeing factories can consist of 3-15 baths depending on the dyeing process, and clean water is used in all of these baths. Therefore, wastewater is generated at every stage. These wastewaters are sent to the wastewater pool to not be reused. When the dyeing processes of different yarn types such as viscose, cotton, acrylic, polyester, and nylon are examined, they are dyed with different numbers of baths. In addition, the dye ratios of the given dyeing agents are different from each other. For example, when the water remaining in the bath is examined after dyeing acrylic, clear water is seen, while the situation is the opposite for viscose/cotton. At this stage, wastewater samples generated in each dyeing process can be analyzed with appropriate methods and reused for dyeing certain yarn types. By applying treatment processes according to the content of wastewater, British Textile Technology Group and Goodman and Porter textile wastewater reuse criteria can be met or wastewater that has been treated at a maximum level can be integrated into the dyeing process or post-dyeing washing baths with nearly 100% performance. It is estimated that 20% of the world's clean water resources are used in the textile industry and up to 100 liters of water are required to produce one kilogram of textile product. In this direction, by applying environmentally friendly methods to reduce high water consumption in textile dyeing factories and aiming to reuse wastewater, the daily water consumption in textile dyeing factories is aimed to be minimized. In this thesis, research has been conducted on acrylic (cationic dyeing) and cotton (reactive dyeing), which are relatively easier to dye than other fiber types. For a facility with a daily water consumption of 100 tons, the aim is to discharge 30% of the water to the recycling pool and to use all of the discharged water again in dyeing processes. Key Words: Climate Change, Textile Dyeing, Waste Water, Recycling, Carbon Footprin