Schools
Permanent URI for this community
Browse
Browsing Schools by Title
Now showing 1 - 20 of 596
Results Per Page
Sort Options
Item 10. KALKINMA PLANI HEDEFLERİ VE NÜKLEER SANTRALLER(Bilim ve Teknoloji, 2013-09-06) BALKU, ŞaziyeTürkiye Cumhuriyeti 10. Beş Yıllık Kalkınma Planı (2014-2018) resmi hazırlık süreci 5 Haziran 2012 tarihli 14 sayılı Başbakanlık Genelgesiyle başlatılmış ve kurulan Özel İhtisas Komisyonları arasında Enerji Güvenliği ve Verimliliği de yer almıştır. Komisyonu oluşturan akademisyenler, kamu kurum ve kuruluşları ile özel sektör ve sivil toplum kuruluşlarının temsilcileri enerji arz güvenliği, fiyatlarının yüksekliği ve belirsizliği, çevresel sorunlar, iklim değişikliği, yüksek yatırımda finansman ihtiyacı, enerjinin verimsiz kullanılması, dışa bağımlılığı gibi temel sorunlar ve gelişmeler göz önünde tutularak, ülkemiz enerji sektörü için durum analizi yapmak, bir vizyon geliştirmek ve yol haritası oluşturmak üzere çalışmalarını sürdürmüşler ve mevcut durumun değerlendirmesi, sektördeki gelişme eğilimleri ve muhtemel yansımaları, geleceğe dönük beklentiler, güçlü ve zayıf taraflar, fırsatlar-tehditler, sorunlar ve çözüm önerileri, politika ve strateji önerileri ile plana katkıda bulunmuşlardır.Item 20. yy’da Fotoğraf Makinalarının Gelişimi(Bilim ve Teknoloji, 2012-04-27) ÇALGÜNER, Alper1800’lerin ikinci yarısında – tam da tasarımın zanaat- sanat-endüstri üçgeninin uçlarından çekiştirildiği bir dönemde – bir fotoğraf makinasını kullanmak uzmanlık, hatta profesyonellik gerektirmekteydi. Ürünün taşınması, kurulması, sabitlenmesi, gerekli ışık ayarlarının yapılması, pozlanması ile, filmin yerleştirilmesi ve çıkarılması dışında, banyo edilmesi ve basılması süreçleri de ileri düzeyde malzeme, mekanizma ve ışık gibi özelleşmiş alanlarda bilgiye hakimiyeti zorunluluk haline getiriyordu. Fotoğraf makinası; çok sayıda parçası olan, kurulumu uzun ve zahmetli, kullanımı beceri isteyen, maliyetli bir üründü. İşte bu ortamda meydana gelen devrimsel bir gelişme, fotoğraf makinası tasarımları ile birlikte endüstri - ticaret ilişkisinde de geri dönülmez değişikliklere neden olmuştur.Item 2012 Nobel Fizik Ödülü: KUANTUM BİLGİSAYARLARA DOĞRU BİR ADIM(Bilim ve Teknoloji, 2012-12-28) AYDIN, Ramazan2012 Nobel Fizik Ödülü, tekil kuantum sistemlerin kontrolünü ve ölçümünü olanaklı kılan ve kuantum optiğinde çığır açacak nitelikte deneysel yöntemler geliştiren bilim insanlarına verildi. Serge Haroche (College de France, Paris, France, Ecole Normale Superieure, Paris, France) ve David J. Wineland (National İnstitute of Standards and Technology, Boulder, CO, USA, University of Colorado, Boulder, CO, USA) fotonları ve iyonları tek tek tuzaklayarak yakından incelemek suretiyle, kuantum mekaniğinde bazı büyük sorunları çözmede önemli adımlar attılar. Kuantum parçacıklara zarar vermeden, yani ölçüm esnasında kuantum mekaniksel durumlarını koruyarak, parçacıkların (burada foton ve iyonlar) kontrol edilmesine ve fiziksel özelliklerinin yüksek duyarlılıkla ölçülmesine olanak sağlayan deney teknikleri günümüze kadar mümkün değildi. Burada ışık parçacıklarının yani fotonların tuzaklanması, diğer bir anlatımla, durdurulması ve kontrol altına alınarak ileri düzeyde deneysel hassasiyetle incelenmesi söz konusudur. Geliştirilen deneysel yöntemlerle, ışığın temel yapıtaşı olan fotonun ve maddenin temel taşı olan atomun adım adım görüntülenmesi ve kuantum mekaniksel davranışlarının araştırılması mümkün oldu. Böylelikle kuantum optik teknolojisinde yeni potansiyel uygulama olanakları doğdu.Item 2014 Nobel Fizik Ödülü(Bilim ve Teknoloji, 2014-12-10) AYDIN, RamazanYapay aydınlatma ve elektrik enerjisi tasarrufunda çığır açan mavi ışık diyotları (mavi LED) geliştiren 3 Japon fizikçi bu yılın Nobel fizik ödülünün sahibi oldular. İsveç Kraliyet Bilim Akademisi, 2014 Nobel Fizik Ödülünü yüksek enerjili beyaz ışık üretimini olanaklı kılan yüksek verimlilikte mavi ışık salan diyotları geliştiren bilim insanlarına verilmesine karar verdi. Isamu Akasaki (Meijo University, Nagoya, Japonya), Hiroshi Amano (Nagoya University, Japonya) ve Shuji Nakamura (University of California, Santa Barbara, ABD) tarafından gerçekleştirilen buluş “insanlığın büyük menfaatine” katkıda bulunduğu gerekçesiyle bilim tarihinin en büyük ödülüne layık görüldü.Item A CALCULATION METHOD FOR A SHOVEL-TRUCK SYSTEM WITH AN INCLINED HOIST OF TRUCKLIFT TYPE(The International Journal of Mineral Resources Engineering, 2008-07-21) CZAPLICKI, Jacek M.The proposal to apply an inclined hoist of the Trucklift type in open pit mining hung in mid-air. Although this suggestion is quite interesting, no mine around the world was interested in such an installation. It appears that one of the main reasons for which the proposal missed its aim was the lack of the method of analysis and calculation of shovel-truck systems including such a type of hoist to allow an assessment of what kind of improvement might be expected if the hoist is employed in the system. This paper shows the method of analysis and calculation of shovel-truck systems with a hoist, considering the majority of the important compenents that have an influence on the course of the operation/exploitation process of the machinery system. An example is given to add to the communicativeness of the considerations and conclusions drawn.Article A Close Examination of Ankara’s Reinforced Concrete Buildings Designed and Constructed between 1923 and 1938(Buildings, 2023-01) Tunç, Gökhan; Tunç, Tanfer EminThe Republic of Turkey was established in 1923 out of the remains of the Ottoman Empire. Between 1923 and 1938, the Turkish republic underwent fifteen years of rapid expansion and growth, with Ankara as its new capital and Mustafa Kemal Atatürk (1881–1938) as its first president. During this period, reinforced concrete (RC) played a significant role in the construction of Ankara’s public-use buildings. This study focuses on 57 of these structures, built either partially, or entirely, out of RC. The buildings are classified with respect to their duration, soil properties, foundation types, structural design details, construction types, materials and overall costs. In order to provide a better picture of the time period in which these buildings were designed and constructed, the technical, financial and political aspects of the projects, and the difficulties and challenges involved in their design and construction, are also discussed. Furthermore, this study outlines the impact of foreign engineers, construction workers, firms and the educational system on the development of civil engineering and use of RC in Turkey.Item A COMPANY-PERSPECTIVE COST ANALYSIS OF THE PERSONAL DUST MONITOR (PDM)(The International Journal of Mineral Resources Engineering, 2007-07-20) REED, W.R.; VOLKWEIN, J.C.; JOY, G.J.The personal dust monitor (PDM) is a new coal mine respirable dust sampling instrument that has the ability to provide accurate end-of-shift and real-time respirable dust exposure data. A hypothetical cost comparison analysis of the PDM with the current MSHA-required coal mine dust personal sampling unit (CMDPSU) was conducted. Some simplifying assumptions were made to create hypothetical cases for analysis. This analysis was limited to respirable dust sampling of the one designated operator (DO) and one designated area (DA) for one mechanized mining unit (MMU) which operated one shift per day. Only sampling intervals of the minimum sampling as required by federal regulations and continuous sampling were analyzed. This cost analysis from the company perspective is only one part of an overall cost/benefit analysis that should be conducted at a later date. In this analysis, company-associated costs were examined for both sampling systems. Results show that the PDM, while it has high initial costs of approximately $ 12,600, may be a cost-effective sampling system for measuring coal mine respirable dust. The estimated present worth cost of conducting the minimum requried dust sampling over a five-year life ranges from $5,850 to $19,000 for the CMDPSU, with the higher present worth cost including costs of potential violations incurred. For the PDM, the comparable present worth cost is $14,900 to $19,300, with the lower present worth cost representing a lower capital cost of $8,150 per unit if more than 850 units are produced per year, while the higher present worth cost reflects the results with the higher $12,600 capital cost.Article A Comparative Analysis of the Criteria for Choosing Sustainable Materials for Façades in Turkey and the European Union(Sustainability, 2024-02-11) Daşkın, Haney Başak; Bărbulescu, Alina; Muntean, Radu; Akçay, Emre CanerOne of the primary contributors to energy consumption is the construction industry. To address the urgent demand for eco-friendly approaches in this field, this study conducted an investigation on Scopus and Web of Science databases to identify the criteria for selecting sustainable materials for façades. Three groups of criteria were derived after a systematic review: Environmental, Social/economic and Technical. The main goal of the research was to answer the question of whether there are differences in these materials’ selection between Turkey and European Union countries. After applying statistical tests, it was found that there are significant differences in selecting eco-friendly material only from the social/economic perspective. The most important sub-criterion is the economic cost. Comparisons with results from China and US confirm this finding.Item A Comprehensive Assessment Plan for Accreditation in Engineering Education: A Case Study in Turkey(International Journal of Engineering Education, 2015-08-02) TURHAN, Çiğdem; ŞENGÜL, Gökhan; KOYUNCU, MuratThis paper describes the procedure followed by Computer Engineering and Software Engineering programs at Atilim University, Ankara, Turkey, which led to the granting of five years of accreditation by MUDEK, the local accreditation body authorized by The European Network for Accreditation of Engineering Education (ENAEE) to award the EUR ACE label, and a full member signatory ofWashington Accord of International Engineering Alliance (IEA). It explains the organizational structure established for preparation, determination and measurement of the educational objectives, program outcomes, course outcomes, and the continuous improvement cycle carried out during the preparation period. The aim of the paper is to share methods and experiences which may be beneficial for the other programs that are intended for accreditation.Article A comprehensive characterization of the effect of spatter powder on IN939 parts fabricated by laser powder bed fusion(Materials and Design, 2023-10-15) Doğu, Merve Nur; Özer, Seren; Mussatto, Andre; Yalçın, Mustafa Alp; Davut, Kemal; Obeidi, Muhannad Ahmed; Kumar, Ajay; Hudson, Sarah; O'Neill, Darragh; O'Connor, Robert; Gu, Hengfeng; Brabazon, DermotThis study is focused on a comprehensive characterization of virgin and spatter IN939 powders and the effects of a certain amount of spatter powder on the part quality of IN939 fabricated by the L-PBF process. A brown tint coloration formed Al2O3 oxide, pores, a 124.4% increase in the average particle size, a 10.2% decrease in the powder circularity, and a 7.5% decrease in the powder aspect ratio were observed in the spatter powder. Additionally, higher average grain size and lower nanohardness were obtained for the spatter powder. In order to understand the effect of a certain amount of spatter powder on the part quality, 10 wt.% spatter powder was mixed with the virgin powder. This addition was found to decrease the flowability of the powder. Moreover, this addition decreased relative density by around 0.3% and increased surface roughness by around 80.8% in the fabricated samples (termed as V and SV). On the other hand, there was no considerable microstructural, texture, microhardness, and nanohardness difference between V and SV samples, although the spatter powder addition caused a 30.2% increase in the average grain size of SV. The overall texture for both V and SV samples exhibit (001)//BD.Item A computational study on 4,7-di(furan-2-yl)benzo[c][1,2,5] thiadiazole monomer and its oligomers(Journal of Molecular Modeling, 2014-04-23) KAYI, HakanThe energy gap, Eg, between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molec ular orbital (LUMO) energy levels that determines the elec tronic and optical properties of 4,7-di(furan-2- yl)benzo[c][1,2,5]thiadiazole (FSF) polymer is calculated by performing quantum chemical calculations. First, we theoret ically investigated the most stable conformers of FSF mono mer and its corresponding oligomers at the B3LYP/6-31G(d) and B3LYP/LANL2DZ levels of theory. We reveal the theoret ical molecular structure of this very recently synthesized novel monomer and its oligomers for the first time in the literature. Our results from the B3LYP/6-31G(d) calculations indicated that FSF polymer has a low HOMO-LUMO gap of 1.55 eV to be in good agreement with the experiments. Experimental design and synthesis of novel conjugated polymers require time-consuming and expensive procedures. The findings from this study are promising for the use of computational methods in the design of the novel conjugated polymers, and help to narrow the materials to be used in design and synthesis of conjugated polymers with desired properties.Item A Concept Map Approach for Introduction to Computer Engineering Course Curriculum(IEEE EDUCON Education Engineering 2010, 2010-04-16) TOKDEMİR, Gül; ÇAĞILTAY, NergizAs in any discipline, in Computer Engineering, students start learning the basic concepts of the discipline in their first year through an Introduction to Computer Engineering course. The topics toughed in this course can be grouped into two. The first group includes simple concepts like binary numbering system, hard disk, memory, and I/O devices. In the second group, and introduction to the courses that they will take in the next semesters of the program which includes programming, networking, software engineering, artificial intelligence and database systems. The main objective of this course is to give an introduction about the general concepts of the field to the first year Computer Engineering students and prepare them to understand the connections between them for their future studies. However, students and instructors face with many problems in this course. First, because of the diversity of the concepts given in the course, it is very diffucult for the students to see the big picture of the Computer Engineering domain. Similarly, it is diffucult for the instructors to prepare the course content in an integrated manner at the students' level. Additionally, the perception of the theory and practice behind the hardware and software topics and their connections is not an easy task for the beginners. Moreover, the topics are mostly abstract topics, which do not allow application of any laboratory sessions. Students usually find this course diffucult to understand, which decreases their motivation about the department and success of the course. This study is established to propose a concept map approach to better visualize and discover all the connections between the concepts of Computer Engineering field which can be used in the curriculum of the programs and introductory courses of the field addressing the above problems. The proposed concept map helps to visualize the general picture of the field.Article A DFT study of TiC3 as anode material for Li-ion batteries(Applied Surface Science, 2023-07-13) Park, Jongee; Fatima, Syeda AfrinishTwo-dimensional monolayer titanium carbide (TiC3) was used to study as a suitable electrode material for lithium-ion batteries with first principles calculation. The monolayer TiC3 showed excellent structural stability, high mechanical stiffness and good electronic conductance behaviour. The adsorption of Li on the carbon rich composition of titanium carbide monolayer is predicted to be favourable. TiC3 structure has remained the same, preserving its metallicity after Li adsorption with attaining high electrical conductivity during lithiation/delithiation process. Especially, the theoretical specific capacity of TiC3 monolayer is high, up to 1916 mAh/g, which is five times higher than the practical graphite. The low open circuit voltage (0.26 V) and diffusion energy barrier (0.25 eV) are also beneficial for overall performance of LIBs. Importantly, during lithiation the change in area is very small and reaches only 8.1 % for full lithiation indicating that it can avoid the large volume expansion during charge/discharge cycles. Its excellent performance, including high melting temperature, dynamical and mechanical stability, can be credited to the rigidness of the TiC3. Given these advantages, that is, high specific capacity, low Li diffusion energy barrier, low open circuit voltage and high in-plane stiffness, TiC3 monolayer can be a promising anode material for lithium-ion batteries.Item A fixed point theorem for set-valued quasi-contractions in b-metric space(2014-12-06) KARAPINAR, Erdal; AYDI, Hassen; BOTA, Monica-Felicia; MITROVIĆ, SlobodankaIn this article, we give a fixed point theorem for set-valued quasi-contraction maps in b-metric spaces. This theorem extends, unifies and generalizes several well known comparable results in the existing literature.Item A GENETIC ALGORITHM BASED COURSE SCHEDULING SYSTEM(Ulusal Bilişim Kurultayı, 2008-08-04) AYDIN, Cansu Çiğdem; ÇAĞILTAY, Nergiz; BİROĞUL, SerdarCourse scheduling problem is assigning of courses into specific time slots and located in suitable rooms. The manual solution of this problem by considering all constraints usually requires a long time and a hard work in order to provide an appropriate solution. In addition, the obtained solution usually is unsatisfactory due to limited human oversight. In this study, Genetic Algorithm (GA) is presented for solving the constraint-based university timetabling problem. The developed system includes flexible and intelligent software that automate the course scheduling task and addresses all special features found in Atilim University’s Engineering Faculty.Item A HIERARCHY OF SINGULAR INTEGRAL OPERATORS FOR MIXED BOUNDARY VALUE PROBLEMS(2011-08-08) AKSOY, Ümit; ÇELEBİ, OkayA class of integral operators having a hierarchy of polyharmonic kernels is introduced and some properties are derived. Iterated mixed boundary value problems for complex model equations and linear elliptic complex partial differential equations are discussed in the unit disc of the complex plane.Article A Hybrid-Flipped Classroom Approach: Students’ Perception and Performance Assessment(Ingeniería e Investigación, 2023-08-04) Yalçınkaya Gökdoğan, Bengisu; Çoruk, Remziye Büşra; Benzaghta, Mohamed; Kara, AliThis study presents an improved hybrid-flipped classroom (hybrid-FC) education method based on technology-enhanced learning (TEL) along with diluted classes for a course on probability and random processes in engineering. The proposed system was implemented with the participation of two student groups who alternated weekly between attending face-to-face activities and fully online classes as a sanitary measure during the pandemic. The education model was combined with the flipped classroom (FC) approach in order to improve the quality of learning and address the negative effects of remote education. Before the lessons, the students studied the course material, filled a question form, and then took a low-stake online quiz. Then, the students attended a session where the questions reported in the forms were discussed, and they took an online problem-solving session followed by an individual quiz. Class sessions were available to both online and face-to-face students, as well as in the form of video recordings for anyone who missed lessons. Qualitatively and quantitatively, the proposed education method proved to be more effective and comprehensive than conventional online methodologies. The students' performances were evaluated via quizzes and exams measuring the achievement of the course learning outcomes (CLOs). Weekly pre/post-tests were applied to examine the students’ progress in each topic. Midterm and final exams were planned to measure the level of success for all course topics. Additionally, the students' perception was assessed with questionnaires and face-to-face interviews. A performance assessment showed an apparent increase in the success rate, and the students' perception was found to be positive. Este estudio presenta un método educativo mejorado de aula invertida híbrida (hybrid-FC) basado en el aprendizaje mejorado por tecnología (TEL) junto con clases diluidas para un curso sobre probabilidad y procesos aleatorios. El sistema propuesto se implementó con la participación de dos grupos de estudiantes que alternaban semanalmente entre asistir a actividades presenciales y totalmente en línea como una medida sanitaria durante la pandemia. El modelo educativo se combinó con el enfoque de aula invertida (FC) para mejorar la calidad del aprendizaje y hacer frente a los efectos negativos de la educación a distancia. Antes de asistir a clase, los estudiantes estudiaban el material del curso, completaban un formulario de preguntas y luego tomaban un quiz en línea de bajo impacto. Luego, los estudiantes asistían a una sesión en la que se discutían las respuestas en los formularios, y tomaban una sesión en línea de resolución de problemas, seguida de un cuestionario individual. Las clases estaban disponibles tanto para los estudiantes en línea como para aquellos que asistían de forma presencial; también había grabaciones de video para quien faltara a clases. Cualitativa y cuantitativamente, el método educativo propuesto demostró ser más efectivo y completo que los métodos online convencionales. El desempeño de los estudiantes se evaluó mediante cuestionarios y exámenes que medían el logro de los resultados de aprendizaje del curso (CLO). Se realizaron exámenes previos y posteriores semanales para examinar el progreso de los estudiantes en cada tema. Se planificaron exámenes parciales y finales para medir el nivel de éxito de todos los temas del curso. Además, la percepción de los estudiantes se evaluó con cuestionarios y entrevistas presenciales. La evaluación del desempeño mostró un aumento aparente en la tasa de éxito, y se encontró que la opinión de los estudiantes era positiva.Article A long‑run convergence analysis of aerosol precursors, reactive gases, and aerosols in the BRICS and Indonesia: is a global emissions abatement agenda supported?(Environmental Science and Pollution Research, 2023-02) Romero‑Ávila, Diego; Omay, TolgaThis article examines the hypothesis of deterministic emissions convergence for a panel of the BRICS and Indonesia to advanced countries’ emissions levels as well as to Sweden (which is a country that has clearly gone through decoupling) using a novel dataset with ten series of annual estimates of anthropogenic emissions comprising aerosols, aerosol precursor and reactive compounds, and carbon dioxide from 1820 to 2018. For that purpose, we employ four novel panel unit root tests allowing for several forms of time-dependent and state-dependent nonlinearity. The evidence supports deterministic convergence following a linear process for carbon dioxide, whereas the adjustment is asymmetric and nonlinear for carbon monoxide. Methane and nitrogen oxides exhibit logistic smooth transition converging dynamics. In contrast, black carbon, ammonia, nitrous oxide, non-methane volatile organic compounds, organic carbon, and sulfur dioxide emissions diverge. These results have implications for the abatement of greenhouse gases emissions at the global level, given the high share of emissions of the BRICS.Item A Magnetic Measurement System and Identification Method for Buried Magnetic Materials Within Wet and Dry Soils(IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING, 2016-03-04) EGE, Yavuz; NAZLIBİLEK, Sedat; KAKİLLİ, Adnan; ÇITAK, Hakan; KALENDER, Osman; ERTÜRK, Korhan Levent; ŞENGÜL, Gökhan; KARAÇOR, Deniz—In this paper, a new magnetic measurement system is developed to determine upper surfaces of buried magnetic materials, particularly land mines. This measurement system uses the magnetic-anomaly-detection method. It also has intelligent identification software based on an image matching algorithm. It is aimed to determine and identify the buried ferromagnetic materials with minimum energy consumption. It is concentrated on the detection and identification of the shapes of upper sur faces of buried magnetic materials in dry and wet conditions. The effect of humidity in the detection process for detection is tested. In this paper, we used sensor images to identify various ferromagnetic materials and similar objects. Sensor images of soils at various humidities covering the objects were obtained. We used the speeded-up-feature-transform algorithm in the comparison process of the images. Dry soil sample images match with the corresponding wet soil samples with the highest matching rate. The images for different objects can easily be distinguished by the matching process.Article A metagenomic survey of bacterial communities from kurut: The fermented cow milk in Kyrgyzstan(Chemistry and Biodiversity, 2024-02) Yeğin, Zeynep; Mamatova, Zhanylbubu; Yurt, Mediha Nur Zafer; Taşbaşi, Behiye Büşra; Acar, Elif Esma; Uçak, Samet; Süleymanoğlu, Ali Anil; Aydın, Ali; Özalp, Veli Cengiz; Sudağıdan, MertKurut is a traditional dry dairy product mostly consumed in Central Asia. In this study, the distribution of the dominant bacteria present in kurut samples (n=84) originated from seven (Chuy, Issyk-Kul, Talas, Naryn, Jalal-Abad, Osh, and Batken) regions in Kyrgyzstan were analyzed with Illumina iSeq100 platform. The dominant phylum detected was Firmicutes followed by Proteobacteria, Actinobacteria, Cyanobacteria/Chloroplast, and Tenericutes. The most abundant family detected was Lactobacillaceae followed by Streptococcaceae, Enterococcaceae, Chloroplast, and Leuconostocaceae. At the genus level, Lactobacillus was the predominant one in samples and Streptococcus, Enterococcus, Lactococcus, and Streptophyta followed this. Further comprehensive characterization analyses in kurut samples may have potential applications both in industrial starter culture developments and also future therapeutic approaches based on potential strains with probiotic properties.