Publications

Pavlov’s Dog: A Simple Circuit Implementation using a Volatile Memristor

Correction to: Impacts of climate change on spatial drought distribution in the Mediterranean Basin (Turkey): different climate models and downscaling methods

No abstract is provided for this article.

A novel metaheuristic optimization and soft computing techniques for improved hydrological drought forecasting

Mu’înü’l Mürîd’de isim yapma ekleri (II): fiilden isim yapanlar

Bu çalışmada Harezm Türkçesinin dil özelliklerini içinde barındıran ve 1313 tarihinde İslâm tarafından yazılmış Mu’înü’l Mürîd adlı eserde fiilden isim yapma ekleri incelenmiştir. Pek hacimli olmayan ve 407 dörtlükten oluşan, dinî-tasavvufî öğretilerin yer aldığı eserde fiilden isim yapma ekleri fişleme yöntemiyle belirlenmiş ve tasnif edilerek betimsel bir bakışla derinlemesine incelenmiş ve bazı sonuçlara ulaşılmıştır. Türklerin geniş kitleler halinde İslam dinine yöneldikten sonra insanların dinî konulara yoğunlaşma isteğini ve yeni kavramları karşılama, dinî öğretileri insanlara kolayca anlatma sorumluluğu üstlenen Harezm Türkçesi; dönem olarak Türk dilinin engin ifade gücü ve işleyen sisteminin ortaya konduğu bir dönemdir. Yeni kavramların dile yerleştiği bu dönem, eklerin ve kelimelerin belirlenerek günümüz kullanımlarına ve geçmiş şekillerine ışık tutması bakımından yine büyük bir önem taşımaktadır. Bu vesile ile eserdeki tüm fiilden isim yapma eklerinin işlev olarak kullanıldığı şekiller tespit edilerek çeşitli karşılaştırmalarda bulunmak ve Türkçenin hâlâ tartışılmakta olan konularından yapım eklerine, eserde işlendiği şekliyle farklı bir bakış açısı sunabilmek amaçlanmıştır. Tespit edilen eklerin Eski Türkçe ve günümüzdeki özellikleri ile Harezm dönemi özellikleri arasında çeşitli kıyaslamalarda bulunmak ve Türkçenin ekler vasıtasıyla canlı, işler hâlini ve zenginliğini ortaya koymak hedeflenmiştir.

Challenges of innovation through knowledge management practices in construction: A North Cyprus Perspective

Construction firms are increasingly look:ing for innovative constructional solutions to offer their clients. The innovation potential of the firms depends on their ability to acquife existing knowledge, to Cfeate new knowledge and to make use of it fof the fealization of new constructional solutions. The main objective of this study is to investigate the challenges of innovation through knowledge management (KM) practices in North Cyprus construction industfy. The fesearch focus is to 1) identify the key issues and challenges of innovation that contfibute to successful implementation of KM practices 2) analyze the current initiatives of innovation through KM practices, and 3) assess the effectiveness of innovation initiatives through KM practices in construction contractofs. The fesearch includes an extensive literature study, interviews with managefs on innovation through knowledge management practices in construction, analysis of this infofmation to develop findings, and extending these to pfesent the key dfivefs that could be targeted fof innovation through knowledge management sustainability. The papef commences on undefstanding the contractofs' own processes and detecting theif weaknesses and stfengths, detefmining the strategies and actions that should be made in the long term to adopt innovation and knowledge management practices and helping the North Cyprus construction industry to leam as a whole. The papef concludes how the drivefs of innovation through knowledge management practices can offef benefits to construction contractofs in North Cyprus if appropriate strategies are adopted.

Ultrasound and UV Stimulated Heterogeneous Catalytic Oxidation of an Azo Dye: A Synergistic Effect

This research deals with the decolourisation of direct azo dye, Direct Blue 71 (DB71), in aqueous solution by means of sonocatalytic, photocatalytic and sonophotocatalytic heterogeneous oxidation processes in the presence of a zinc oxide (ZnO) catalyst. The effect of these oxidation processes under visible light and 20 kHz ultrasound was investigated to study their influence on degradation rates by varying the initial dye concentration, pH and catalyst load and to understand the effect of synergy on the degradation process. The synergistic effect is quantified in terms of a synergy factor which has already been defined in the literature. The highest value of the factor was obtained for a low DB71 dye concentration at pH 5.5, 20 °C temperature and 400 mg L −1 optimum ZnO dosage. Pseudo first-order kinetics were followed for the removal of the azo dye according to the Langmuir–Hinshelwood model. For comparison, the Langmuir–Hinshelwood model was also used for experimental values obtained from the sonocatalytic process, the photocatalytic process and the combination of these processes. The Langmuir–Hinshelwood kinetic model demonstrated consistency in all calculations of the initial rates of degradation with the appropriate values for the reaction rate constant and DB71 dye absorption constant.

Effect of anchor bars on seismic behavior of infilled walled frames

User-defined plastic hinge properties obtained experimentally are used to examine the structural behavior of bare, infilled walled frames with and without anchor bars in reinforced concrete (RC) buildings. Experimentally obtained moment-curvature relationships of structural members (i.e., beams and columns) are used to determine the plastic hinge properties of each section. Three building frames are modeled and examined for time-history analysis using 20 ground-motion records. Seismic performance levels of three buildings are analyzed to determine the effects of anchor bars. Limit states at each performance level are defined, and the multi-record incremental dynamic analysis curves are obtained; 16%, 50%, and 84% fractal curves are obtained for each case. Cumulative distribution functions are constructed to summarize the varieties in the roof-drift ratios of three RC buildings with different frame types for design-based and maximum-considered earthquake hazards. It is found that, with an increased spectral acceleration of ground motions, the probability of exceeding the performance levels of infilled walled frames in reinforced buildings is reduced with the help of anchor bars. The increased stiffness of RC buildings with infilled wall frames exhibiting lower ductility is re-gained by the absorption energy of the anchor bars.

Energy Evaluation of a Phase Change Material Wall Covered with Novel Triple Glass

A research study was conducted to investigate the thermal performance of phase change material (PCM) walls. The south-facing external wall of a test room was constructed using PCM walls composed of brick walls, plasterboards containing PCMs, and novel triple glass. The thermal performance of the PCM walls was experimentally determined on a monthly basis. However, because of the unstable characteristic of the meteorological data, evaluation of any solar application is usually made using the mean values from long-term meteorological data. In addition to the experimental analysis, a theoretical performance analysis based on 10-year mean meteorological data was carried out to provide a more general conclusion about the performance of the PCM walls. The results from the theoretical analysis show that the ratio of the solar energy gain provided by the GR35 PCM wall to the heat load of the test room on a monthly basis varies from 7 to 57% during the heating period from October to May; the ratio is 16% on an annual basis

Erzincan İlindeki Hayvansal Atıkların Biyogaz Potansiyelinin Araştırılması

Fosil kökenli enerji kaynaklarının tükenebilir olması, çevreye olan olumsuzetkileri ve enerji ihtiyacının gün geçtikçe artması mevcut kaynakların dahaetkin kullanımı yerli ve yenilenebilir enerji kaynaklarına yönelimi gereklikılmıştır. Temel geçim kaynağı tarım ve hayvancılık olan Erzincan ili yüzölçümünün%37’si çayır ve meralardan oluşmaktadır. Bu durum, yem bitkisi çeşitleriningeniş alanlarda yetiştirilmesine ve beraberinde hayvansal üretimindegelişmesine neden olmuştur. Büyükbaş, küçükbaş ve kanatlı hayvanyetiştiriciliği yapılan Erzincan ilinde yılda 434469 ton hayvansal atık eldeedilmektedir. Bu atıkların sürdürülebilir ve etkin bir biçimde kullanımının eniyi yollarından biri de biyogaz üretimidir. Bu çalışmada, Erzincan Damızlık Sığır Yetiştiricileri Birliği ile Gıda,Tarım ve Hayvancılık il Müdürlüğü verileri kullanılarak, Erzincan ili hayvansalatıklardan elde edilebilir yıllık biyogaz miktarı 15511011 m3,elektrik enerjisi 38025864 kWhe ve ısı enerjisi 35818027112 kcalolarak hesaplanmıştır. Erzincan’ınbiyogaz kaynaklı elektrik kurulu gücü bakımından 4.3 MW’lık bir potansiyelbarındırdığı, biyogaz ve enerji üretimi değerleri açısından da kayda değer birnitelik taşıdığı görülmektedir. Temel geçimkaynağı tarım ve hayvancılık olan Erzincan ili yüzölçümünün %37’si çayır vemeralardan oluşmaktadır. Bu durum, yem bitkisi çeşitlerinin geniş alanlardayetiştirilmesine ve beraberinde hayvansal üretiminde gelişmesine nedenolmuştur. Büyükbaş, küçükbaş ve kanatlı hayvan yetiştiriciliği yapılan Erzincanilinde yılda 434469 ton hayvansal atık elde edilmektedir. Bu atıklarınsürdürülebilir ve etkin bir biçimde kullanımının en iyi yollarından biri debiyogaz üretimidir. Bu çalışmada, Erzincan Damızlık SığırYetiştiricileri Birliği ve Gıda, Tarım ve Hayvancılık il Müdürlüğü verilerikullanılarak, Erzincan ili hayvansal atıklardan elde edilebilir yıllık biyogazmiktarı 15511011 m3, elektrik enerjisi 38025864 kWhe veısı enerjisi 35818027112 kcal olarak hesaplanmıştır. Erzincan’ın biyogaz kaynaklı elektrik kurulugücü bakımından 4.3 MW’lık bir potansiyel barındırdığı, biyogaz ve enerjiüretimi değerleri açısından da kayda değer bir nitelik taşıdığıgörülmektedir.

Effect of longitudinal circular hollows on the flexural strength of reinforced concrete beams

In this study, the effect of hollows passing through reinforced concrete (RC) beams in the longitudinal direction on flexural strength was examined. 4 RC beams were designed to satisfy the conditions for implementation. One of the beams was fabricated as a reference specimen and 3 of the remaining beams were fabricated with total of 5 pipes in the tension, neutral axis and compression regions. All experimental beam specimens were subjected to 4-point axial flexural tests with the request for constant flexural moments at the limits of loading. Experimental beams with pipes in the compression region, tensile region and neutral axis regions were confronted with the reference beam in terms of initial stiffness, ductility, load-bearing capacity and energy absorption capacity. It was verified that to provide that both the sufficient stiffness and sufficient ductility conditions for the reinforced concrete beams, do not establish any structural discontinuity, the longitudinal orbicular cross-section hollows created by pipes should be passed through the neutral axis region as much as possible. The results of the present study not only align with those of previous research (e.g., the correlative results) but also extend the current state of research (e.g., the revealed differences) and provide starting points for future research. Conclusions are drawn from these results at the end of the paper.

ACADEMIC STUDIES IN ENGINEERING SCIENCES

Erzincan kent merkezi deprem yapı stoğu ve ulaşım altyapı analizi

Erzincan kent merkezindeki 24 adet mahallede, 2000 yılından önce inşa edilmiş 2 kat ve üstü betonarme-yığma binalar, Erzincan Belediyesi ruhsat kayıtları ve Mekânsal Adres Kayıt Sistemi (MAKS) verileri incelenerek sayı olarak 3199 adet olarak tespit edilmiştir. Askeri binalar analiz çalışmasına dâhil edilmemiştir. Bu çalışmada, Coğrafi Bilgi Sistemleri (CBS) tabanlı olarak, sokaktan hızlı bina tarama yöntemleri ile riskli olan yapıların belirlenmesi, bina performans değerlendirmelerinin yapılması, risk haritalarının oluşturulması ve olası bir afet anında güvenli ulaşım yollarının belirlenmesi amaçlanmıştır. Kat adedine bağlı olarak yapı stoğu yükseklik haritası, saha çalışması sonrası bina performans değerlendirme durum haritaları, afet anında oluşabilecek tahliye ulaşım altyapı analizi, barınma ve toplanma alanlarının odak noktaları ve afet trafik yoğunluğu haritaları hazırlanmıştır. Genel olarak Erzincan il merkezinde Trafik yoğunluğu artırımlı senaryolardan elde edilen sonuçlara göre ana yolları destekleyecek yeni tali yolların imar planı dâhilinde açılması ihtiyacı oluşmuştur.

Experimental evaluation and modeling of corroded reinforced concrete columns

A total of 30 full-scale reinforced concrete (RC) columns were tested to develop models for the prediction of the structural behavior of corroded RC columns. Of these, 25 RC columns were tested under cyclic loading for two different applied axial load ratios, namely, 0.20 and 0.40, at three concrete strength levels, namely, 9, 27, and 37 MPa (1305, 3915, and 5365 psi, respectively), and at four corrosion levels. Five RC columns were loaded monotonically with an axial load ratio of 0.20 at four corrosion levels to calculate the damage index. The actual corrosion levels were obtained by breaking the concrete and extracting all the reinforcement bars. The test results demonstrated that the ductility ratios of the corroded RC columns, which were not determined in accordance with energy-based or bilateral failure criteria, could be misleading. The determined energy dissipation capacity and damage index of the columns further revealed the corrosion effects.

The effect of elevated temperature on the mechanical properties of concrete produced with raw perlite aggregate

Deterioration caused by elevated temperatures in the micro and of concrete can lead to serious decreases in the mechanical properties of the material. In this context, it is important to determine the mechanical properties of the materials constituting the structure to assess the current condition of the reinforced concrete structure after the fire. The present experimental study investigates the effects of elevated temperatures (25 °C, 200 °C, 400 °C, and 600 °C) on cubic and prism samples fabricated with two different aggregate types (raw perlite aggregate and traditional coarse aggregate) by considering four different concrete mixtures (C25, C40, P25, and P40). Additionally, the aim is to reveal the usability of a raw perlite aggregate as an alternative to traditional concrete production in facilities that are likely to be exposed to elevated temperature effects. In line with these aims and objectives, experiments and visual observations were conducted before and after exposure to elevated temperatures using both destructive (e.g., compression test and bending test) and non-destructive (e.g., mass loss, UPV, SEM, color, and crack deterioration) methods. The results show that although they initially have similar mechanical properties (e.g., compressive strength), the deterioration in the P25 and P40 samples is more limited with increasing temperature compared to the C25 and C40 samples. Additionally, although the bending strength of the P25 and P40 samples at 25 °C is lower than that of the C25 and C40 samples due to the more limited stress-strain relationship of the perlite samples, it is observed that the specimens with the same compressive strength show similar flexural behavior under the effect of increasing temperature.

The assessment of rice cultivars widely produced in Turkey in terms of arsenic, cadmium, aluminum and copper: effect of soaking methods and household cooking

Investigation of pH effect by Fenton-like oxidation with ZVI in treatment of the landfill leachate

In this study, effect of pH by Fenton-like with zero-valent iron (ZVI) process, advanced oxidation process in the leachate treatment, was investigated. The effect of pH value on colour and COD removal from leachate was determined at five initial pH values, 2.0, 2.5, 3.0, 3.5 and 4.0 (ZVI = 0.05 g/L, H2O2 = 150 mg/L). The highest colour and COD yield were obtained at pH 2.0. The colour removal was 87.9% (in 620 nm wavelength) and the COD removal was 74%. Experimental data from COD degradation with the Fenton-like process were analysed by using the zero-, first-, second-order and BMG kinetic models.

The removal of COD and color by Fenton oxidation from leachate of Erzurum municipal solid waste landfill

Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Nihal Kocakaplan, Neşe Ertugay, Emine Malkoç; The removal of COD and color by Fenton oxidation from leachate of Erzurum municipal solid waste landfill. AIP Conf. Proc. 18 April 2016; 1726 (1): 020093. https://doi.org/10.1063/1.4945919 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAIP Publishing PortfolioAIP Conference Proceedings Search Advanced Search |Citation Search

Erzincan ili hayvansal atık kaynaklı biyogaz potansiyelinin değerlendirilmesine yönelik biyogaz tesisi senaryoları

In many developing countries, including Turkey, the implementation of waste to energy technology is known as one of the most effective approaches to reach sustainable energy development targets. Although, Turkey with a large number of farm animals has a significant potential, but this potential unrealized for biogas production so far. This study aims to highlight the potential implementation of waste to energy technology via the production of biogas from animal waste as an alternative energy generation in Turkey. Anaerobic digestion of renewable feed stocks such as animal waste has been known as a promising technology for the production of clean energy in the form of biogas. In this study, the energy potential of Erzincan province animal waste was calculated. Findings show that approximately 15.5 million m3year-1 biogas potential can be produced from animal waste in Erzincan. Accordingly, considering the distances, waste capacities and economic efficiency of Erzincan and its districts, 3 different biogas power plant scenarios with 0.5 MW, 1.2 MW and 2.4 MW installed power have been prepared. Appropriate facility capacities, investment costs of these facilities and payback times of the investment required for each facility were calculated. Based on the investigation, numerous opportunities could be explored in terms of turning animal waste to energy by biogas production in Erzincan. It is also possible to establish more biogas plants in the region, in smaller sizes, than the number recommended.