Özcan Işık, Ahmet Çalık, Mohsin Shabir,
Abstract The main objective of this study is to analyze the performance of non-life insurance companies operating in the Turkish insurance industry with a hybrid model including Pythagorean Fuzzy Analytic Hierarchy Process (PFAHP) and Multi-Attributive Ideal-Real Comparative Analysis (MAIRCA) methods. For this purpose, the performance assessment indicators, consisting of fourteen sub-criteria in three dimensions are taken into account for comparing five insurance companies traded on the Borsa Istanbul ( ...
Tópico(s): Forecasting Techniques and Applications
2024 - Springer Science+Business Media | Computational Economics
Burcu Ekim, Ali Çalık, Ahmet Ceylan, Pınar Saçaklı,
This study investigated the effects of dietary Paenibacillus xylanexedens ysm1 supplementation on growth performance, intestinal morphology, immune response, and cecal microbiota of broiler chickens challenged with Escherichia coli K88. A total of 320 one-day-old male broiler chicks were randomly allocated to 4 treatments (8 floor pens, 10 birds/pen) including 1) negative control (NC) birds fed a basal diet and not challenged with E. coli K88; 2) positive control (PC) birds fed a basal diet and challenged ...
Tópico(s): Antimicrobial Peptides and Activities
2020 - Elsevier BV | Poultry Science
Ali Çalık, Ahmet Ceylan, Burcu Ekim, Shahram Golzar Adabi, Furkan Dilber, Alev Gürol BAYRAKTAROĞLU, Turgay Tekinay, Doğukan Özen, Pınar Saçaklı,
This study evaluated the effect of intra-amniotic synbiotic inclusion and continued synbiotic supplementation in the diet on the performance, intestinal epithelium integrity, and cecal microflora of broiler chickens. In Experiment 1, 510 eggs containing viable embryos were divided into 3 groups of 170 eggs each. The first group was not injected and served as a negative control ( NC: ). The next group was injected with 0.9% NaCl and was the positive control ( PC: ). The synbiotic-injected group ( S: ) was injected ...
Tópico(s): Agronomic Practices and Intercropping Systems
2016 - Elsevier BV | Poultry Science
This study investigated the effects of dietary lactulose supplementation on broiler growth performance, intestinal histomorphology, cecal microflora, and cecal short-chain fatty acid (SCFA) concentrations. A total of 245 one-day-old male broiler chickens were randomly assigned to 5 different treatments, with 7 replicates including 7 birds each. The birds received the same basal diet based on corn--soybean meal, and lactulose was included in the diet at 0, 0.2, 0.4, 0.6, or 0.8% at the expense of ...
Tópico(s): Silkworms and Sericulture Research
2015 - Elsevier BV | Poultry Science
Ahmet Çalık, Babak Daneshvar Rouyendegh, Yavuz Selim Özdemır,
There is no doubt that technological changes and globalization have increased the importance of the logistics industry. The effectiveness of logistics services is directly related to expanding the trade network between countries, increasing foreign direct investments and growing the economy. The World Bank evaluates the logistics competitiveness of countries by using its Logistics Performance Index. However, logistics performance evaluation includes multiple criteria, and a realistic assessment ...
Tópico(s): Sustainable Supply Chain Management
2022 - SAGE Publishing | Transportation Research Record Journal of the Transportation Research Board
Sachin Kumar Mangla, Yiğit Kazançoğlu, Abdullah Yıldızbaşı, Cihat Öztürk, Ahmet Çalık,
Abstract The increasing population and income inequality in the last decades have made it necessary to focus on the concept of sustainability. In the changing world order, with economic crises, instabilities, pandemics, and social media, sustainability awareness differs significantly from past years. In addition, developing new technologies and concepts (big data, blockchain, IoT, robotic, etc.) plays a crucial role in meeting social awareness in terms of sustainability. Food sustainability is also ...
Tópico(s): Food Waste Reduction and Sustainability
2022 - Wiley | Business Strategy and the Environment
Esra Boz, Sinan Çizmecioğlu, Ahmet Çalık,
The COVID-19 pandemic has led to major disruptions in workflows across all industries. All sectors are trying to sustain operations during this extremely difficult time and the healthcare sector is the most important of them. It is unthinkable to stop the operations of the health system because it serves human life. Health institutions must supply the products such as masks, gloves, and ventilators subject to service on time for certain activities to continue indefinitely under all conditions. By ...
Tópico(s): Multi-Criteria Decision Making
2022 - Multidisciplinary Digital Publishing Institute | Sustainability
Simay Bayramoglu, Salih Akpınar, Ahmet Çalık,
Tópico(s): Structural Behavior of Reinforced Concrete
2021 - Springer Science+Business Media | Journal of Mechanical Science and Technology
Tópico(s): Quality Function Deployment in Product Design
2020 - Springer Science+Business Media | Soft Computing
Ahmet Çalık, Sinan Çizmecioğlu, Ayhan Akpınar,
Abstract Foreign direct investment (FDI) is seen as an essential part of development due to the contribution of the host country. Profits of FDI such as technology transfers, spillover benefits, and increasing competition have encouraged both of domestic firms and policymakers to attracting FDI. In the course of making investment decisions, foreign investors prefer countries that follow stable economic policies, achieve a certain level of development of financial structure, and have legal regulations ...
Tópico(s): Global trade and economics
2019 - Wiley | Journal of Multi-Criteria Decision Analysis
Ahmet Çalık, Nimet Yapıcı Pehlivan, Cengiz Kahraman,
Due to the differences between regions and sub-regions in the countries, some problems come out especially in economic and social life. The issue of differences of regions has been widely implemented to evaluate the economic performance of Turkey in many disciplines. The objective of this paper is to evaluate the efficiency of 26 sub-regions of NUTS-2 classification using integration Fuzzy Analytic Hierarchy Process (FAHP) with Data Envelopment Analysis (DEA). The integrated FAHP/DEA method comprises ...
Tópico(s): Agricultural and Rural Development Research
2018 - Vilnius Gediminas Technical University | Technological and Economic Development of Economy
Şafak Yıldızhan, Ahmet Çalık, Mustafa Özcanlı, Hasan Serin,
Recently, the attraction on the bio-composite (known as green composites) materials has significantly increased due to the potential of being substitute to conventional materials used in manufacturing industries. Bio-composite materials are produced with natural fibres or natural resins instead of synthesized fibres (carbon, glass, etc fibres) or resins (poly vinyl alcohol, epoxy, etc resins ). The bio-based fibres such as jute, sisal, flax, hemp, bamboo, hair, wool, silk etc., are obtained from plants ...
Tópico(s): Additive Manufacturing and 3D Printing Technologies
2018 - | European Mechanical Science
Abdullah Yıldızbaşı, Ahmet Çalık, Turan Paksoy, Reza Zanjirani Farahani, Gerhard‐Wilhelm Weber,
Closed-Loop Supply Chain (CLSC) management has attained appreciable attention over the last few years. CLSC management allows companies to manage their recovery and recycling activities of end products. Due to the latest developments in the world, producers are responsible for the collection, refurbishing, repairing and disassembly of end products at the end of their lives. This paper develops a mixed-integer CLSC model that is inspired by the automotive industry. In this model, we consider three ...
Tópico(s): Multi-Criteria Decision Making
2018 - Vilnius Gediminas Technical University | Technological and Economic Development of Economy
Biodiesel is a renewable fuel that is produced from vegetable oils and animal fats. The main advantage of biodiesel is its cleaner characteristic after the combustion. Due to its promising effect on the environment, the use of biodiesel is increasing day by day. Therefore, other effects of biodiesel fuels on internal combustion engine must be investigated by researchers. Mechanical vibration of a machine is a highly important phenomenon for safety. Moreover, in some applications, it directly influences ...
Tópico(s): Lubricants and Their Additives
2018 - Elsevier BV | Fuel
Sefa Yıldırım, Erdi Tosun, Ahmet Çalık, İhsan Uluocak, Ercan Avşar,
The present paper investigates the prediction of vibration, noise level, and emission characteristics of a four-stroke, four-cylinder diesel engine fueled with sunflower, canola, and corn biodiesel blends while H2 injected through inlet manifold using two different artificial intelligence methods: artificial neural network (ANN) and support vector machines (SVM). The aim of using these methods is to predict vibration, noise, carbon monoxide (CO), CO2, and NOx based on the initial experimental study ...
Tópico(s): Heat transfer and supercritical fluids
2018 - Taylor & Francis | Energy Sources Part A Recovery Utilization and Environmental Effects
Şafak Yıldızhan, Erinç Uludamar, Ahmet Çalık, Gonca Dede, Mustafa Özcanlı,
The current study investigates the fuel properties, performance and emission characteristics in a variable compression ratio (VCR) diesel of the biodiesel produced from the waste cooking oil (WCO). The WCO samples were collected from the university and converted to biodiesel fuel with a two-step transesterification reaction. The fuel property tests showed that the properties of the WCO biodiesel were within the biodiesel standards. Diesel, WCO biodiesel and diesel-WCO biodiesel blend (B20) was used ...
Tópico(s): Lubricants and Their Additives
2017 - | European Mechanical Science
Ahmet Çalık, Sefa Yıldırım, Erdi Tosun,
In transportation applications, the main reasons of mechanical damage in polymer electrolyte membrane fuel cell (PEMFC) are road-induced vibrations and impact loads. The most vulnerable place of these cells is the interface between membrane and catalyst layer in the membrane electrode assembly (MEA). Hence, studies on mechanical strength of PEMFC should focus on that interface. The objective of present study lies in the fact that employing a prediction method to investigate the damage propagation ...
Tópico(s): Lubricants and Their Additives
2017 - Elsevier BV | International Journal of Hydrogen Energy
The effect of adherend recessing on the strength of full (spew)-fillet-formed bi-adhesively bonded single-lap joint (SLJ) was investigated using the finite-element (FE) method under pure tension (i.e., 20 dissimilar recess length and depth and two-type bi-adhesive bond). A three-dimensional (3D) FE model was developed for bi-adhesively bonded SLJ, which had fillet and recessed adherend, assuming that both adhesive and adherend have geometrical non-linearity and exhibit linear material behaviour. The ...
Tópico(s): Structural Behavior of Reinforced Concrete
2017 - Springer Science+Business Media | Sadhana
Mustafa Özcanlı, Mustafa Atakan Akar, Ahmet Çalık, Hasan Serin,
Hydrogen and HHO enriched biodiesel fuels have not been investigated extensively for compression ignition engine. This study investigated the performance and emissions characteristics of a diesel engine fueled with hydrogen or HHO enriched Castor oil methyl ester (CME)-diesel blends. The production and blending of CME was carried out with a 20% volumetric ratio (CME20) using diesel fuel. In addition, the enrichment of intake air was carried out using pure HHO or hydrogen through the intake manifold ...
Tópico(s): Heat transfer and supercritical fluids
2017 - Elsevier BV | International Journal of Hydrogen Energy
Erinç Uludamar, Erdi Tosun, Gökhan Tüccar, Şafak Yıldızhan, Ahmet Çalık, Sefa Yıldırım, Hasan Serin, Mustafa Özcanlı,
There are two main reasons of alternative fuel search of scientists: environmental problems resulted from combustion of fossil fuels and limited reserves of crude oil. Biodiesel and Hydrogen (H2) are two of the most promising alternative fuels with their environmental friendly combustion profiles. The aim of this study was to evaluate vibration level of a hydroxyl (HHO) gas generator installed and diesel engine using different kinds of biodiesel fuels. In this study, at different flow rates, the effect ...
Tópico(s): Vehicle emissions and performance
2017 - Elsevier BV | International Journal of Hydrogen Energy
The objective of this paper was to predict the failure load in single lap adhesive joints subjected to tensile loading by using artificial neural networks. Experimental data obtained from the literature cover the single lap adhesive joints with various geometric models under the tensile loading. The data are arranged in a format such that two input parameters cover the length and width of bond area in single lap adhesive joints and the corresponding output is the ultimate failure load. An artificial ...
Tópico(s): Non-Destructive Testing Techniques
2016 - Elsevier BV | Alexandria Engineering Journal
Cortical bone is an inhomogeneous and anisotropic tissue subjected to large loads during typical daily activities. While studies assuming isotropic material properties are frequent, anisotropy and inhomogeneity of cortical bone have been rarely taken into account. Moreover, the question, whether an assumption of anisotropy and inhomogeneity has an impact in the mechanical analysis of cortical bone, has not been explored in the literature. This study explores the relevance of anisotropy in human ...
Tópico(s): Orthopaedic implants and arthroplasty
2016 - Taylor & Francis | Biotechnology & Biotechnological Equipment
Kazım Serhan Özcan, Barış Güngör, Damirbek Osmonov, Ahmet İlker Tekkeşin, Servet Altay, Ahmet Ekmekçi, Ercan Toprak, Ersin Yıldırım, Nazmi Çalık, Ahmet Taha Alper, Kadir Gürkan, İzzet Erdinler,
Background: Topical beta-blockers have a well-established role in the treatment of glaucoma.We aimed to investigate the outcome of patients who developed symptomatic atrioventricular (AV) block induced by topical beta-blockers.Methods: All patients admitted or discharged from our institution, the Siyami Ersek Training and Research Hospital, between January 2009 and January 2013 with a diagnosis of AV block were included in the study.Subjects using ophthalmic beta-blockers were recruited and followed ...
Tópico(s): Retinal Diseases and Treatments
2015 - Clinics Cardive Publishing | Cardiovascular journal of South Africa/Cardiovascular journal of Southern Africa
Turan Paksoy, Ahmet Çalık, Abdullah Yıldızbaşı, Sandra Huber,
In today's world, the pressure of competition considerably changed because of the increasing pressure of market competition, changes in customer expectations due to global warming and the globalization of the economy. Growing pressures in supply chain activities urge to companies to adopt new approaches by reducing waste and planning environmental friendly processes, such as recycling, reuse, and remanufacturing. There have been several studies proposed that lean activities can help make the case ...
Tópico(s): Multi-Criteria Decision Making
2018 - Springer Science+Business Media | International series in management science/operations research/International series in operations research & management science
Ahmet Çalık, Nimet Yapıcı Pehlivan, Turan Paksoy, Gerhard‐Wilhelm Weber,
In recent years, the relationship between companies and suppliers has changed with the continuous rise in environmental awareness and customer expectations.In order to fulfill customers' needs, the actors in a Supply Chain (SC) network sometimes compete and sometimes cooperate with each other.In SC management, both competitive and collaborative strategies have become important and have required different points of view.In a collaborative environment, companies should strive for common targets with ...
Tópico(s): Optimization and Mathematical Programming
2018 - Springer Nature | International Journal of Computational Intelligence Systems
Ahmet Çalık, Salih Akpınar, Murat Demiral,
This study investigates the impact of two innovative methods, namely, intermittent metal part reinforcement and countersinking, on the strength of single lap joints (SLJs). In the former method, metal inserts are strategically integrated within the adhesive layer, while the latter involves the application of countersinks on the adherends to create conical depressions for adhesive application. The metal inserts and countersink samples were fabricated using a 5-axis CNC milling machine. Subsequently, ...
Tópico(s): Natural Fiber Reinforced Composites
2024 - Elsevier BV | International Journal of Adhesion and Adhesives
Hamza Ayaydın, Fethiye Kılıçaslan, İsmail Koyuncu, Hakim Çelık, Mustafa Çalık, Ahmet Güzelçiçek, Adnan Kirmit,
Tópico(s): Biochemical Analysis and Sensing Techniques
2021 - Springer Science+Business Media | Journal of Molecular Neuroscience
Salih Akpınar, İlyas Hacısalihoğlu, Ahmet Çalık,
Studies to increase the joint strength of adhesively bonded joints used in the aerospace and automotive sectors are met with interest in the field of engineering. Many different methods are used to increase the strength of the bonded joint, and one of these methods is to change the joint geometry. This study aims to increase the joint strength by changing the geometry of the joint with the same adhesive area condition. In the study, the DP460 structural adhesive was used as the adhesive, the AA2024- ...
Tópico(s): Structural Load-Bearing Analysis
2023 - Taylor & Francis | Mechanics of Advanced Materials and Structures
Today, composite materials are frequently used as materials in engineering due to their light weight and strength. Studies on the use of composite materials and the adhesively bonded joints used to bond these materials are of importance. In general, studies on the bonding method with adhesives are concerned with the strength of the joint. In this study, fiber fabric was reinforced to the bonding area in order to increase the strength of the bonding connections used in the aviation and automotive ...
Tópico(s): Structural Load-Bearing Analysis
2023 - Elsevier BV | International Journal of Adhesion and Adhesives
Marjan Walli-Attaei, Rasha Khatib, Martin McKee, Scott A. Lear, Gilles R. Dagenais, Ehimario Igumbor, Khalid F. AlHabib, Manmeet Kaur, Iolanthé M. Kruger, Koon Teo, Fernando Laņas, Khalid Yusoff, Aytekin Oğuz, Rajeev Gupta, Afzalhussein Yusufali, Ahmad Bahonar, Raman Kutty, Annika Rosengren, Viswanathan Mohan, Álvaro Avezum, Rita Yusuf, Andrzej Szuba, Sumathy Rangarajan, Clara K Chow, Salim Yusuf, Salim Yusuf, Sumathy Rangarajan, Koon Teo, Clara K Chow, Martin O’Donnell, Andrew Mente, Darryl P. Leong, Andrew Smyth, Philip Joseph, Shofiqul Islam, M Zhang, Weiwei Hu, Chinthanie Ramasundarahettige, Gary Wong, Lovely Dayal, Amparo Casanova, Mahshid Dehghan, Gregory D. Lewis, Antonio Aliberti, Álvaro Reyes, Ahmed Zaki, Basil S. Lewis, B Zhang, D Agapay, Danielle M. Hari, E Milazzo, E Ramezani, F Hussain, F Shifaly, I. Patrick Kay, Julija Rimac, John G. Swallow, L Heldman, Maha Mushtaha, Maha Mushtaha, Mark Trottier, N Aoucheva, N Kandy, Pam Mackie, Rubén Solano, Siu Lim Chin, S Ramacham, Sadequa Shahrook, Sylvie Trottier, T Tongana, W Elsheikh, J Lindeman, Matt J. McQueen, Kellie Hall, J. Keys, Xuechao Wang, J Keneth, Anitha Devanath, Rafael Díaz, Andrés Orlandini, B Linetsky, S Toscanelli, Germana Casaccia, JM Maini Cuneo, Omar Rahman, Rita Yusuf, AK Azad, Khondkar Ayaz Rabbani, HM Cherry, Adnan Mannan, I Hassan, AT Talukdar, RB Tooheen, MU Khan, Mariz Sintaha, Tarzia Choudhury, Md Rabiul Haque, S Parvin, Álvaro Avezum, GB Oliveira, CS Marcílio, AC Mattos, Koon Teo, Salim Yusuf, Jane DeJesus, D Agapay, T Tongana, Rubén Solano, I. Patrick Kay, Sylvie Trottier, Julija Rimac, W Elsheikh, L Heldman, E Ramezani, Gilles R. Dagenais, Paul Poirier, Ginette Turbide, D. Auger, A LeBlanc De Bluts, MC Proulx, Marie‐Pierre Cayer, Nadine Bonneville, Scott A. Lear, Danijela Gašević, E Corber, Veronica de Jong, I Vukmirovich, Andreas Wielgosz, George Fodor, Andrew Pipe, A Shane, Fernando Laņas, Pamela Serón, S Martinez, A Valdebenito, María José Oliveros, Li Wei, Lisheng Liu, Chun‐Ming Chen, Xingyu Wang, Wenhua Zhao, Hongye Zhang, JiaXuan, Bo Hu, Yi Sun, Jian Bo, Zhao Xiuwen, Chang Xiaohong, Tao Chen, Hui Chen, Chang Xiaohong, Qing Deng, Xiaoru Cheng, Qing Deng, He Xinye, Bo Hu, JiaXuan, Jian Li, Juan Li, Xu Liu, Ren Bing, Yi Sun, Wang Wei, Yang Wang, Jun Yang, Yi Zhai, Hongye Zhang, Zhao Xiuwen, Zhu Manlu, Fanghong Lu, Jianfang Wu, Yindong Li, Yan Hou, Liangqing Zhang, Baoxia Guo, Xiaoyang Liao, Shiying Zhang, BianRongwen, TianXiuzhen, Dong Li, Di Chen, Wu Jianguo, Xiao Yize, Tianlu Liu, Peng Zhang, Changlin Dong, Ning Li, Xiaolan Ma, Yang Yuqing, Lei Rensheng, Fu Minfan, Jing He, Liu Yu, Xiaojie Xing, Zhou Qiang, Patricio López‐Jaramillo, Paul Anthony Camacho, R Garcia, LJA Jurado, Diego Gómez-Arbeláez, JF Arguello, R Dueñas, S Silva, LP Pradilla, F Ramírez, DI Molina, Carlos Cure-Cure, Suhey Pérez, E Hernandez, E. Arcos, S Fernandez, Claudia Narváez, J Paez, A Sotomayor, Henry García, G. Sánchez, T David, Álvaro Ximénez‐Carrillo, Prem Mony, Mário Vaz, A V Bharathi, Sumathi Swaminathan, Kiruba Shankar, AV Kurpad, KG Jayachitra, Narinder Kumar, HAL Hospital, Viswanathan Mohan, Mohan Deepa, K Parthiban, M Anitha, S Hemavathy, T Rahulashankiruthiyayan, D Anitha, K Sridevi, Rajeev Gupta, RB Panwar, Indu Mohan, Priyanka Rastogi, S. Rastogi, R. Bhargava, Rajesh Kumar, JS Thakur, Binod Kumar Patro, P. V. M. Lakshmi, R Mahajan, P Chaudary, V. Raman Kutty, K. Vijayakumar, Ajayan Kamalasanan, G Rajasree, AR Renjini, A Deepu, B. Sandhya, Stephen Asha, HS Soumya, Roya Kelishadi, Ahmad Bahonar, Noushin Mohammadifard, Hadi Heidari, Khalid Yusoff, Noor Hassim Ismail, KK Ng, A Devi, NM Nasir, MM Yasin, Maizatullifah Miskan, EA Rahman, MKM Arsad, Farnaza Ariffin, SA Razak, FA Majid, NA Bakar, MY Yacob, N Zainon, Ruhaya Salleh, MKA Ramli, NA Halim, SR Norlizan, NM Ghazali, MN Arshad, R Razali, S Ali, HR Othman, CWJCW Hafar, A Pit, Norlaila Danuri, F Basir, SNA Zahari, Hafez Mohammad Ammar Abdullah, MA Arippin, NA Zakaria, Noor Hassim Ismail, MJ Hasni, MT Azmi, MI Zaleha,
BackgroundHypertension is considered the most important risk factor for cardiovascular diseases, but its control is poor worldwide. We aimed to assess the availability and affordability of blood pressure-lowering medicines, and the association with use of these medicines and blood pressure control in countries at varying levels of economic development.MethodsWe analysed the availability, costs, and affordability of blood pressure-lowering medicines with data recorded from 626 communities in 20 countries ...
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