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  • Öğe
    A DFT Study of Si Doped Graphene: Adsorption of Formaldehyde and Acetaldehyde
    (DergiPark, 2020) Akyavaşoğlu, Özge; Fellah, Mehmet Ferdi
    In this study, Si doped graphene sensor property for indoor volatile contaminants formaldehyde and acetaldehyde has been examined. The B3LYP hybrid method with 6-31G(d,p) basis set has been used for this purpose. The adsorption energy of formaldehyde and acetaldehyde have been found to be -24.5 and -33.3 kcal/mol, respectively. The characteristic C=O bond frequency has been decreased after adsorption of the molecules and the bond peaks frequencies have been decreased in both aldehydes. There was a charge transfer from adsorbent to formaldehyde oppositely from acetaldehyde to adsorbent.
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    Cellular response to calcium phosphate cements
    (Elsevier, 2020) Cecen, Berivan; Kalemtaş, Ayşe; Topates, Gulsum; Kozaci, Leyla Didem
    Calcium orthophosphate (COP) ceramics have been investigated as bone repair materials for many decades. The first in vivo application of these materials was accomplished in 1920 to test tricalcium phosphate performance as a bone substitute. Since this first attempt, various COPs were investigated on animals to shed light on their effect on the healing behavior of bones. Calcium phosphate cements are currently receiving a great deal of interest especially for the hard tissue repair, augmentation, and regeneration applications due to their attractive characteristics such as biocompatibility, ease of shaping, osteoconductivity, and biodegradability.
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    Directed topological complexity of spheres
    (Springer Nature, 2020) Borat, Ayşe; Grant, Mark
    We show that the directed topological complexity [as defined by Goubault (On directed homotopy equivalences and a notion of directed topological complexity, 2017. arXiv:1709.05702)] of the directed n-sphere is 2, for all n≥ 1. © 2019, The Author(s).
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    The representation of culture into ELT materials
    (Peter Lang AG, 2020) Özcan, Eda Nur; Gürsoy, Esim
    The representation of culture into ELT materials
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    On the sustainability of the national architecture movement mosque typology: Architect Kemalettin's Mosques
    (Peter Lang AG, 2020) Islamoğlu, Özge; Aras, Aylin
    The National Architecture Movement is a style that took shape with the Turkish movement that developed under the influence of nationalist thought in the West in the 19th century, and was born as a reaction to the late Ottoman architecture that was under the influence of the West at that time. This style aimed to refine our understanding of architecture and with these principles it left traces in today's Turkish towns. Kemalettin, the architect, (1870-1927) who was one of the pioneers of the movement, designed many buildings that reflect the first national architecture period. Mosque structures were especially in the foreground among the structures that were built within the style of the period. These structures represent private areas that reflect the social, cultural and economic structure; lifestyle and philosophy of the periods they belong to; urban memory; and are important witnesses of past cultures and periods. Sustainability of these structures should be ensured by protecting them with their unique plan schemes, decorations and construction techniques. In this context, the study includes the architectural analysis of the mosques designed by Architect Kemalettin Bey, who is one of the pioneers of the First National Architecture style, with his unique characteristic structure. The aim of the study is to read the national architectural movement mosque typology through the Architect Kemalettin's mosques and to contribute to the documenting, preservation and thus the sustainability of the mosque typology, which has its own characteristics. Depending on the fact that Kemalettin Bey was the pioneer of the period, the mosques under study are thought to have the quality to give information about the period.
  • Öğe
    On Bjarke Ingels' sustainable architectural approach
    (Peter Lang AG, 2020) Aras, Aylin; Islamoğlu, Özge
    Sustainability is an interdisciplinary concept that dates back to the 1970s and, since then, has proved to be more and more important. Consumerism leads to excessive use of natural resources, making the concept of sustainability more of a scientific notion in the eyes of experts. Natural resources, energy, and cultural values should be used more efficiently than they are today in order to pass them down to future generations. Sustainability should be addressed from political, cultural, social, economic, and administrative perspectives in a holistic manner; and experts of various disciplines should approach the issue more sensitively and profoundly. Of all industries, the construction industry uses the most natural resources as materials and energy during the whole processes of construction, use, and demolition. Architecture is economically, ecologically, and socially related to sustainability, and therefore, should take it into account more than other fields. Bjarke Ingels is a world-renowned architect. His designs integrate sustainability to increase the standards of living. The aim of this study was to address the significance of sustainability in Bjarke Ingels' designs. A literature review was carried out, and then, his designs were analyzed to reflect on his understanding of sustainability. To that end, the study theoretically addressed his approach to sustainability, and then, evaluated it through his designs.
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    Fault ride-through (FRT) capability and current FRT methods in photovoltaic-based distributed generators
    (Elsevier, 2020) Bayrak, Gökay; Ghaderi, Davood; Sanjeevikumar P.
    In this chapter, current methods used for fault ride-through (FRT) capability are examined by researching studies on the capacity of FRT in grid-connected photovoltaic (PV) systems after any failures. These methods have been researched to show the best strategy that can be applied for PV systems by analyzing the FRT methods currently used. FRT methods are classified as external and internal (inverter-resident) methods in the chapter. Energy storage-based methods, flexible alternating current transmission system (FACTS)-based methods, and inverter-resident methods are investigated for PV-based distributed generators. Energy storage-based methods are expensive, and the life cycle of used units is short. Besides, energy storage-based methods are easy to implement. The total cost and complexity of FACTS-based methods were found to be the highest, among others. Regarding grid regulation compatibility, inverter-resident methods are highly effective, and a modified inverter controller method has been found to be the best solution among existing methods.
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    A new solution proposal for pedestrian-vehicle traffic: Uzun street sample in Turkey
    (Peter Lang AG, 2019) Aras, Aylin; Aras, Egemen
    This chapter was made in order to propose a solution to ease the traffic flow of Uzun Street where the pedestrian and motor vehicle traffic is dense. In the scope of the study, a structural walking platform at the levels of the second floors of the buildings lined up along the axis of Uzun Street will be built. Motor vehicle traffic will be made possible under the platform and passages to the side streets will be built. Thus, both the pedestrian density of the street will be eased and the second-floors will be used as stores.
  • Öğe
    Acculturation of Syrian Refugees in Turkey as a Condition for Successful SLA
    (IGI Global, 2019) Gürsoy, Esim; Ertaşoğlu Deniz, Leyla
    The literature is dominated by the studies on refugee studies since it is a current issue with great importance. In addition, this group of people leaving their homes due to serious human rights violations need to occupy a great space in the policy agendas and to be studied to enlighten policymakers and authorities in this fragile process of handling the issue of immigration. This necessitates higher education institutions involvement for a healthier and more systematic process of adaptation. Among the large group of refugees, Syrians-upon the break of the civil war in 2011-are the most visible group in Turkey. Witnessing the swiftly changing socioeconomic dynamics in the world, Turkey is now home to a considerable number of Syrians. Furthermore, the intersection of Syrian refugees and the Turkish society has generated an intercultural space impacting on their SLA experiences, which is complicated by the process of adjustment concerning the two groups-those “uprooted” from their homes and the host society.
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    Intercontinental and regional evaluation of terrorism and its economic effects
    (Emerald Group Publishing Ltd., 2019) Çetin, Işin; Yıldırır Keser, Hilal; Ay, Sema
    Terrorism dates back to the uprising against the Roman Empire in first century BC and the term entered Western literature during the eighteenth century. Conceptually, it has emerged as a security problem in a national and international context. However, terrorism is not only a security problem but also has significance on political, social, cultural, psychological, and especially economical aspects. A weak economic structure of a country makes it easier for terrorist organizations to manipulate its society in a certain direction. Issues such as economic growth, foreign trade, employment, foreign investments, and public expenditures are first affected by terror incidents, and thereafter are known to have medium- and long-term effects. In general, it is observed that developed countries are less affected from terror incidents than developing countries. In this context, in this study, regional assessments will be made using the following indicators: the Global Terror Index (GTI), gross domestic product (GDP), export, foreign investments, and public expenditure. Regional and intercontinental assessments will be implemented using spatial econometric techniques. The GeoDa package program will assess the diversity in terrorism between continents. Our main hypothesis is that terrorism's economic effect is more in developing countries and the Middle East than among other developed countries. The other aim of the study is to determine which terrorism is more effective and which economic indicator is more affected and gives the best result about effects of the terrorism on the countries and continents. This study predominantly tries to examine whether terror incidents are most influential on the economies in the Middle East region.
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    The impact of rater experience and essay quality on the variability of EFL writing scores
    (Taylor and Francis, 2019) Şahan, Özgür
    This chapter addresses a research gap by examining raters with varying levels of experience. It investigates the variability of ratings assigned to English as a foreign language (EFL) essays of different qualities in Turkish higher education by raters with varying levels of experience. Raters gave similar scores to high-quality essays but varied in their scores given to low-quality EFL essays. Given that assessing students’ EFL writing performance in higher education plays an important role in students’ academic careers, ensuring reliability to provide students with fair judgments is essential in tertiary education in Turkey. The variation among raters while assessing high-quality essays suggests a fairness problem in EFL assessment for student writers with better writing abilities. EFL writing is offered as a separate course in different forms, such as advanced writing or academic writing, in the preparatory programs and English major departments, and students’ progress is evaluated through in-term and end-of-term exams.
  • Öğe
    Productivity Analysis of Timber Skidding Operation with Farm Tractor
    (Forest Engineering and Technologies Platform, 2018) Gölci, Sercan; Böyöksakall, Halit; Ta, Nanç; Akay, Abdullah Emin
    Farm tractors equipped with necessary attachments have been widely used in skidding of forest products in Turkey. There are farm tractors of different types and sizes used in forest operations. For appropriate logging plans and better machine selections in mechanized forest operations, it is important to analyze the efficiency of farm tractors during skidding operations. In this study, it was aimed to analyze the productivity of timber skidding operation with farm tractor. Time study was used to estimate productivity and then the effects of specified factors (volume and number of piece) on productivity were investigated by using statistical analysis. Logging operation took place in a black pine (Pinus nigra) stand located in the province of Köyce?iz in Mu?la. Time data of work stages (i.e. move-out from landing to stump unloaded, choker setting at the stump, skidding loaded from stump to landing, and unloading at the landing) during uphill skidding operation were collected for two skidding trails with different slope classes (20% and 30%) while average skidding distance was kept constant at 100 m. It was found that the average productivity for two slope classes were 5.72 m3/hr and 4.30 m3/hr, respectively. The results indicated that the productivity increased as the volume of skidded logs per turn increased for both slope classes. On the other hand, increasing number of pieces transported in each turn caused reduction in productivity of skidding operation by farm tractor. The most time consuming work stage was skidding followed by move-out unloaded and choker setting stages. © 2021 Complex Issues of Cardiovascular Diseases.
  • Öğe
    First report of Diplodia sapinea on Cedrus libani in Turkey
    (John Wiley and Sons Inc, 2018) Oskay F.; Lehtijaervi, Asko Tapio; Dogmuş-Lehtijärvi H.T.; Woodward S.
    Cedar of Lebanon (Cedrus libani) is an ecologically and economically important conifer with a natural distribution in southern Turkey. Currently, no serious diseases affect C. libani in its native range, although it is susceptible to pathogens such as Heterobasidion annosum and Diplodia pinea in inoculation experiments (Lehtijärvi et al., 1). Recent reports from the Balkans and Northern Europe, however, suggest that C. libani is susceptible to foliage and shoot diseases such as Diplodia pinea, Dothistroma septosporum and Sirococcus tsugae (Mullet et al., 2; Zlatkovic et al., 2016).
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    Experimental investigation of the effect of E85 on engine performance and emissions under various ignition timings
    (Elsevier Ltd, 2014) Türköz, Necati; Erkuş, Bariş; Karamangil, M. Ihsan; Sürmen, Ali; Arslanoǧlu, Nurullah
    In this study, we experimentally investigated the best ignition timing in an SI engine using an E85 ethanol blend by altering the timing angle with respect to gasoline use regarding the output performance parameters such as power and efficiency. We also determined the energy distribution of the engine. The experiments were carried out on a 4-stroke, 4-cylinder spark ignition engine, and the excess air coefficients were almost all maintained at approximately unity. To achieve this, the fuel orifice holes of the carburettor were suitably enlarged for the E85 ethanol blend. The ignition timing was successively delayed in 2° increments up to 6° (denoted as -2, -4, -6, respectively) and then successively advanced by 2° up to 6° (denoted as +2, +4, +6, respectively) with respect to the advance values used with gasoline (called the "original advance values") at full load operation. The best performance and emissions were obtained with +4. Advanced ignition timing resulted in an increase in NOx emissions, while CO and CO2 remained relatively unaffected. Increasing the delay in ignition timing caused poorer combustion and hence more HC emissions and fuel consumption.
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    Reducing noise level in vehicles by spunbonded nonwovens made from bicomponent filaments
    (Fiber Society, 2013) Suvari, Fatih; Ulcay, Yusuf; Maze, Benoit; Pourdeyhimi, Behnam
    Reducing noise level in vehicles by spunbonded nonwovens made from bicomponent filaments
  • Öğe
    On the design method of lightweight construction materials: Structural characteristics-tearing strength relationship
    (Fiber Society, 2012) Suvari, Fatih; Ulcay, Yusuf
    On the design method of lightweight construction materials: Structural characteristics-tearing strength relationship
  • Öğe
    Sound absorptive nonwovens for indoor structures
    (Fiber Society, 2012) Suvari, Fatih; Ulcay, Yusuf; Pourdeyhimi, Behnam
    Sound absorptive nonwovens for indoor structures
  • Öğe
    Preparation and properties of poly(ethylene terephthalate)/nanoclay nanocomposites fibers
    (Fiber Society, 2012) Hojiyev, Rustam; Altun, Şule; Ulcay, Yusuf
    Preparation and properties of poly(ethylene terephthalate)/nanoclay nanocomposites fibers
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    Transforming planning education: Practicing Collaborative Governance and Experiential Learning in a Graduate Level Planning Studio
    (Taylor and Francis, 2021) Waite, Imge Akcakaya; Alkay, Elif; Becerik Altındiş, Sinem
    This study attempts to close the gap between western planning studio education and its Turkish counterpart through a critical review of planning models and teaching methods they employ, focusing on an examination of a recent graduate-level studio experience from Istanbul Technical University. The case studio explored the application of the planning paradigm of collaborative planning and governance and experiential teaching methods in approaching the decades-old regeneration problems of an informal housing area in a dense neighborhood in central Istanbul. Through structured instructor observation and a student survey, the empirical research investigates the extent to which the master-level students have or have not benefitted from select contemporary planning and teaching approaches, and derives lessons for improving the instruction and experience of this and other planning studios in Turkey and beyond. The findings suggest that a collaboration- and governance-focused planning approach allowed the students to better keep up with and reflect on recent literature and debates. They took part in collaboration not only on site with different public, private and civil stakeholder groups but also with each other through close interactions between and within student groups both inside and outside the studio. The experiential learning methods employed, on the other hand, helped the planning studio live up to the corresponding principles of contemporary global studio education.
  • Öğe
    Systematic Customer Value Analysis: A Case Study in the Automotive Industry
    (Society of Sytematic Innovation, 2021) Çakmak, Tolga; Altun, Koray
    Providing high quality with competitive prices is generally essential in the automotive industry because of the customers (directly automotive OEMs and indirectly their end-users) demanding new and costly features without showing additional willingness to pay. For this reason, accurate analysis of customer value can be very helpful for developing new concepts, and hence for correct positioning in this competitive area. Although one of the most important parts of the engine in an automobile is the clutch, there are very limited studies on its value analysis in the literature. Correspondingly, to fill this gap, this paper analyses the customer value of automotive clutch components and their functions by using a two-phase QFD methodology, and a fuzzy-logic based data-fusion methodology. While the former phase determines relative weights of the bene-fit through the House of Quality, the latter phase performs the parts (and cost) deployment to determine the costs of the clutch functions by using a reverse costing analysis incorporating the product teardown cost in-formation. Having obtained benefit, cost, and technical difficulty information, a fuzzy-logic model evaluates the competitive importance of each clutch function. This work identifies the three most important clutch functions and their related subcomponents.