Arama Sonuçları

Listeleniyor 1 - 10 / 477
  • Öğe
    Examination of web-based PVGIS and sunny design web photovoltaic system simulation programs and assessment of reliability of the results
    (Batman Üniversitesi, 2017-12-31) Haydaroğlu, Cem; Gümüş, Bilal
    Due to the polluting effect of fossil fuels on environment and their exhaustible nature, investments in renewable energy resources continue to increase. In order to benefit from solar energy which is one of these energy resources, 50 GW of new power plants were installed only in 2015. Following the "regulation on unlicensed electricity generation" issued to benefit from the renewable energy potential available in Turkey, the installation of systems that generate electricity from solar energy via photovoltaic power is rapidly increasing. The use of simulation software is very important in the design and analysis of photovoltaic solar power plants. In this way, it is possible to obtain production data and conduct investment analyses before the power plant is established. Some of the simulation programs are web-based. In this study, web-based solar energy simulation programs PVGIS and Sunny Design Web were investigated and the proximity of simulation results to the actual results was studied. Dicle University Solar Power Plant was selected as the study field in order to compare the simulation results of the software. Dicle University Solar Power Plant is a photovoltaic solar power plant established and operated within the Engineering Faculty of Dicle University for introduction, education, production and analysis purposes. In the study, simulation of the 250 kWp solar power plant established in Dicle University was performed with PVGIS and Sunny Design Web software by using installation parameters and thus, one-year production values were obtained. The results of both web-based programs are compared with each other and with the actual production values from the plant.
  • Öğe
    Biodiesel production from inedible animal tallow and an experimental investigation of its use as alternative fuel in a direct injection diesel engine
    (Elsevier, 2009-02-15) Altun, Şehmus; Öner, Cengiz
    In this study, a substitute fuel for diesel engines was produced from inedible animal tallow and its usability was investigated as pure biodiesel and its blends with petroleum diesel fuel in a diesel engine. Tallow methyl ester as biodiesel fuel was prepared by base-catalyzed transesterification of the fat with methanol in the presence of NaOH as catalyst. Fuel properties of methyl ester, diesel fuel and blends of them (5%, 20% and 50% by volume) were determined. Viscosity and density of fatty acid methyl ester have been found to meet ASTM D6751 and EN 14214 specifications. Viscosity and density of tallow methyl esters are found to be very close to that of diesel. The calorific value of biodiesel is found to be slightly lower than that of diesel. An experimental study was carried out in order to investigate of its usability as alternative fuel of tallow methyl ester in a direct injection diesel engine. It was observed that the addition of biodiesel to the diesel fuel decreases the effective efficiency of engine and increases the specific fuel consumption. This is due to the lower heating value of biodiesel compared to diesel fuel. However, the effective engine power was comparable by biodiesel compared with diesel fuel. Emissions of carbon monoxide (CO), oxides of nitrogen (NOx), sulphur dioxide (SO2) and smoke opacity were reduced around 15%, 38.5%, 72.7% and 56.8%, respectively, in case of tallow methyl esters (B100) compared to diesel fuel. Besides, the lowest CO, NOx emissions and the highest exhaust temperature were obtained for B20 among all other fuels. The reductions in exhaust emissions made tallow methyl esters and its blends, especially B20 a suitable alternative fuel for diesel and thus could help in controlling air pollution. Based on this study, animal tallow methyl esters and its blends with petroleum diesel fuel can be used a substitute for diesel in direct injection diesel engines without any engine modification.
  • Öğe
    Fırat Üniversitesi kampüsünde gürültü kirliliğinin değerlendirilmesi
    (Batman Üniversitesi, 2018-06-27) Nacar Koçer, Nilüfer; Durmuş, Barbaros
    Trafik gürültüsü, insan sağlığını büyük ölçüde etkileyen ve giderek artan bir çevre sorunudur. Motorlu taĢıt sayısının hızla artmasıyla oluĢan trafik gürültüsü, çevrenin gürültüye maruz kalabileceği kirlilik kaynaklarından biri haline gelerek, kentsel yaĢam kalitesini kısıtlamaktadır. Bu çalıĢmanın temel amacı Elazığ Ġli Fırat Üniversitesi kampüsünde gürültü kirliliğinin belirlenmesidir. Bu amaçla trafiğin yoğun olduğu saatlerde günde dört sefer gürültü ölçümleri yapılmıĢtır. Gürültü ölçümleri sabah 07:00 - 10:00, öğlen 11.00 – 14.00, öğlenden sonra 16:00 –18:00 ve akĢam 19:00 – 20:00 saatleri arasında yapılmıĢtır. Yapılan çalıĢma sonucunda üniversite kampüs alanında gürültü seviyesinin en yüksek ve en düĢük olduğu kavĢaklar tespit edilmiĢtir
  • Öğe
    English prepositions as function words are not as easy for language learners as normally supposed to be
    (Batman Üniversitesi, 2022-06-30) Yaş, Emin
    Prepositions as function words and single monomorphemic words are the most basic words of the human language, especially in the context of maintaining daily life. They are probably the first lexes/words entered to the human’s linguistic repertoire, as their requirements in the language are so essential. Prepositions shows various relationships between lexes or phrases in sentences. Among these relationships time, points, position, direction and various degrees of mental or emotional attitudes seem to be significant. The purpose of the research is try to reveal what kind of challenges English prepositions have for the learners and also to confirm if they are as difficult as some linguists have stated before. Another purpose is to find out which features are more difficult among all their entity properties. The results of this study disclose that English prepositions possess very complex structures, different meanings and an associating duty of various types of part of speeches. In particular, those that construct the phrasal verbs require great effort for learning due to the loss of the meaning (sometimes partially, sometimes completely) they undergo. It has been understood that their properties such as steadily changing meaning and function make them quite difficult elements for learners of English.
  • Öğe
    Coordinated design of TCSC and PSS by using PSO algorithm for enhancement of SMIB power system stability
    (Batman Üniversitesi, 2017) Ekinci, Serdar; Hekimoğlu, Baran
    The main aim of this study is to investigate the enhancement of power system stability via individual and coordinated design of Thyristor Controlled Series Compensation (TCSC) and Power System Stabilizer (PSS) in single machine infinite bus (SMIB) power system. The coordinated design problem of PSS and TCSC-based controllers is formulated as an optimization problem with an eigenvalue-based objective function. Then, particle swarm optimization (PSO) algorithm is applied to search for optimal controller parameters. To compare the performance of PSS and TCSC-based controllers, both of them are designed independently at first and then in a coordinated manner for individual and coordinated applications. The proposed stabilizers are tested on a weakly connected power system subjected to various disturbances. The eigenvalue analysis and nonlinear simulation results show the robustness and the effectiveness of the proposed controllers and their ability to provide efficient damping of low frequency oscillations. Matlab/SIMULINK software package is used for the simulations.
  • Öğe
    A preliminary study: Increasing the efficiency of filter press process in art tile production
    (Batman Üniversitesi, 2015) Bayazit, Murat
    Torna veya kalıpta işlenecek plastik çini çamuru yapımında kullanılan temel hammaddeler kil, kaolen ve karbonatlı malzemelerdir. Öğütme, dinlendirme, filter pres ve vakum pres işlemleri üretimde takip edilen adımlardır. Çamur nem içeriği oldukça önemlidir ve bunu etkileyen en önemli unsur da filter prestir. Nem içeriğinin düşürülmesiyle üretim verimliliğinin arttırılmasını amaçlayan bu ön araştırmada filter pres çamur keklerinin nem içeriğinin incelenmesi ve iyileştirilmesi için Kütahya’da çini çamuru üretimi yapan başlıca işletmelerin çamur içeriği dikkate alınarak temsili bir çini çamuru reçetesi ve bu reçeteden daha az kil ve daha fazla özsüz hammadde içeren yeni bir reçete hazırlanmıştır. Ayrıca bu reçetelerle hazırlanan çamurun kuruma küçülmesi (1500C), pişme küçülmesi (1050-10800C), pişme rengi, sır uyumu (910-920oC) ve işlenebilirliği de gözlemlenerek endüstriyel olarak sürekli üretime uygun olup olmadığı belirlenmiştir.
  • Öğe
    The effect of Plantago major Linnaeus on serum total sialic acid, lipid-bound sialic acid, some trace elements and minerals after administration of 7,12-dimethylbenz(a)anthracene in rats
    (SAGE, 2012-04) Oto, Gökhan; Ekin, Suat; Özdemir, Hülya; Levent, Abdulkadir; Berber, İsmet
    The present study was designed to evaluate the effect of Plantago major Linnaeus (PM) extract on serum total sialic acid (TSA), lipid-bound sialic acid (LSA), some trace elements (copper (Cu), zinc (Zn) and iron) and mineral levels (magnesium, calcium and sodium) in Wistar albino rat administrated 7,12-dimethylbenz(a)anthracene (DMBA). Rats were divided into three equal groups (n = 6). Group I comprised the control group, group II was treated with DMBA (100 mg/kg, single dose) and group III was treated with DMBA (100 mg/kg single dose) and aqueous extract of PM 100 mg/kg/day for 60 days. After 60 days, statistical analyses showed that TSA and LSA levels in DMBA and DMBA + PM groups were significantly higher compared to the control group (TSA: p < 0.01, p < 0.05; LSA: p < 0.05, p < 0.05, respectively). Serum Zn levels were decreased in subjects treated with DMBA (p < 0.01) and DMBA + PM (p < 0.05) compared to the control group values. Serum Cu levels were increased in DMBA group and PM-treated group compared to the control group values. The results of this investigation showed that the levels of TSA and LSA changed significantly, which are sensitive markers for detecting the toxic effects of DMBA. On the other hand, observed decline in Zn levels in rats from DMBA + PM group might be due to decreased generation of free radicals and oxidative stress. Results from this study suggest that PM may be partially effective in preventing carcinogenesis initiated by environmental carcinogen DMBA.
  • Öğe
    1st International engineering and technology symposium (1st IETS): Abstract book 03 – 05 May 2018
    (Batman Üniversitesi, 2018) Aydın, Hüseyin; Sayğılı, Hasan; Demir, Mehmet Emin; Özsaraç, Şafak; Demir, Muhammed Sungur
    Welcome to IETS’18 Many thanks for your contribution to IETS’18 which will be held between 3-5 May 2018 at the Batman University-Batman-TURKEY. IETS’18 is organized by Batman University, Faculty of Engineering and Architecture. The 1st International Engineering and Technology Symposium (IETS’18) is an international meeting for exchanging new information, ideas and applications of any fields of engineering. The conference aims link researchers from academic world specializing in every engineering discipline. The conference is organized by University of Batman. More than 416 presentations have been accepted for conference from many universities. The organization committee would like to thank all those who have helped in making the Conference better. It was a great pleasure for us to bring together specialists, research scientists and industrial technology developers together. IETS’18 is expected to stimulate new ideas and concepts, promoting further advances in the almost every fields of engineering. I wish all participants have a pleasant stay in the magnificent city of Batman and I am looking forward to see you all together be pleased and enjoy your time here with us. Batman May, 2018 Assoc. Professor Dr. Hüseyin AYDIN (Symposium Chair)
  • Öğe
    The comparison of engine performance and exhaust emission characteristics of sesame oil-diesel fuel mixture with diesel fuel in a direct injection diesel engine
    (Elsevier, 2008-01-09) Altun, Şehmus; Bulut, Hüsamettin; Öner, Cengiz
    The use of vegetable oils as a fuel in diesel engines causes some problems due to their high viscosity compared with conventional diesel fuel. Various techniques and methods are used to solve the problems resulting from high viscosity. One of these techniques is fuel blending. In this study, a blend of 50% sesame oil and 50% diesel fuel was used as an alternative fuel in a direct injection diesel engine. Engine performance and exhaust emissions were investigated and compared with the ordinary diesel fuel in a diesel engine. The experimental results show that the engine power and torque of the mixture of sesame oil-diesel fuel are close to the values obtained from diesel fuel and the amounts of exhaust emissions are lower than those of diesel fuel. Hence, it is seen that blend of sesame oil and diesel fuel can be used as an alternative fuel successfully in a diesel engine without any modification and also it is an environmental friendly fuel in terms of emission parameters.
  • Öğe
    Taming the late Quaternary phylogeography of the Eurasiatic wild ass through ancient and modern DNA
    (PLoS One, 2017-04-19) Gündem, Can Yumni; Bennett, E Andrew; Champlot, Sophie; Peters, Joris; Arbuckle, Benjamin S; Guimaraes, Silvia; Pruvos, Mlanie; David, Shirli Bar; Davis, Simon J M; Gautier, Mathieu; Kaczensky, Petra; Kuehn, Ralph; Mashkour, Marjan; Morales, Arturo; Muiz, Morales; Pucher, Erich; Tournepiche, Jean François; Uerpmann, HansPeter; Blşescu, Adrian; Germonpr, Mietje; Moull, Pierre Elie; Ötzan, Aliye; Walzer, Chris; Grange, Thierry; Geigl, Eva Maria
    Taxonomic over-splitting of extinct or endangered taxa, due to an incomplete knowledge of both skeletal morphological variability and the geographical ranges of past populations, continues to confuse the link between isolated extant populations and their ancestors. This is particularly problematic with the genus Equus. To more reliably determine the evolution and phylogeographic history of the endangered Asiatic wild ass, we studied the genetic diversity and inter-relationships of both extinct and extant populations over the last 100,000 years, including samples throughout its previous range from Western Europe to Southwest and East Asia. Using 229 bp of the mitochondrial hypervariable region, an approach which allowed the inclusion of information from extremely poorly preserved ancient samples, we classify all non-African wild asses into eleven clades that show a clear phylogeographic structure revealing their phylogenetic history. This study places the extinct European wild ass, E. hydruntinus, the phylogeny of which has been debated since the end of the 19th century, into its phylogenetic context within the Asiatic wild asses and reveals recent mitochondrial introgression between populations currently regarded as separate species. The phylogeographic organization of clades resulting from these efforts can be used not only to improve future taxonomic determination of a poorly characterized group of equids, but also to identify historic ranges, interbreeding events between various populations, and the impact of ancient climatic changes. In addition, appropriately placing extant relict populations into a broader phylogeographic and genetic context can better inform ongoing conservation strategies for this highly-endangered species.