WoS İndeksli Yayınlar Koleksiyonu

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Akıllı güvenlik kamerası sistemi tasarımı
(IEEE, 2015-06-22) Erkan, Emre; Özçalık, Hasan Rıza; Yılmaz, Şaban
Closed circuit TV systems have recently become an indispensable part of daily life. Cameras are of vital importance as significant elements of security systems in different buildings such as houses, stores and shopping malls. IP technology contributed to the development of security systems which witnessed rapid improvements in terms of smart image analysis. Recent security camera systems with smart video analysis serve a vital purpose. This study focuses on designing a smart security camera system.
Al-Makrizi’s Khitat and the markets in Cairo during the Mamluks era
(Türk Tarih Kurumu, 2017-08) Ağır, Abdullah Mesut
This study examines the markets in Cairo during the reign of the Mamlūks in the light of al-Makrīzī’s Chronicle al-Khitat. Besides those which were built during the Mamlūks era the commercial life were ongoing at the markets dating back to the Fatimids and the Ayyubids periods. The marketplaces generally occupied in al-Qasaba which was between Bāb al-Futūh in the north and Bāb al-Zuwayla in the south was the trading center of the city. Al-Qasaba is al-Mu’izz Street today which takes its name from the Fatimid Caliph al-Mu’izz li-Dinillah (341-364/953-975). The economic and social decline especially seen during the second half of the Mamlūks in the 15th century af-fected also the domestic markets stability and most of the sûqs disappeared depending on these conditions.
The analysis of lateral distribution of barrier height in identically prepared Co/n-Si Schottky diodes
(Elsevier, 2009-11-03) Güllü, Ömer; Karataş, Şükrü; Güler, Gülşen; Bakkaloğlu, Ömer Faruk
We have studied the experimental linear relationship between ideality factors and barrier heights (BHs) for Co/n-Si metal–semiconductor (MS) structures with a doping density of about 1015 cm−3. The barrier heights for the Co/n-type Si metal–semiconductor structures from the current–voltage (I–V) characteristics varied from 0.64 to 0.70 eV, the ideality factor n varied from 1.18 to 1.26, and from reverse bias capacitance–voltage (C−2–V) characteristics the barrier height varied from 0.68 to 0.81 eV. The experimental barrier height distributions obtained from the I–V and C−2–V characteristics were fitted by a Gaussian distribution function, and their mean values were found to be 0.67 and 0.75 eV, respectively. Furthermore, the lateral homogeneous BH value of approximately 0.81 eV for Co/n-Si metal–semiconductor structures was obtained from the linear relationship between experimental effective BHs and ideality factors.
Analysis of the series resistance and interface state densities in metal semiconductor structures
(Journal of Physics: Conference Series, 2009-03) Güllü, Ömer; Karataş, Şükrü; Güler, Gülşen; Bakkaloğlu, Ömer Faruk
The electrical properties of Co/n-Si metal-semiconductor (MS) Schottky structure investigated at room temperature using current-voltage (I-V) characteristics. The characteristic parameters of the structure such as barrier height, ideality factor and series resistance have been determined from the I-V measurements. The values of barrier height obtained from Norde’s function were compared with those from Cheung functions, and it was seen that there was a good agreement between barrier heights from both methods. The series resistance values calculated with Cheung’s two methods were compared and seen that there was an agreement with each other. However, the values of series resistance obtained from Cheung functions and Norde’s functions are not agreeing with each other. Because, Cheung functions are only applied to the non-linear region (high voltage region) of the forward bias I–V characteristics. Furthermore, the energy distribution of interface state density was determined from the forward bias I-V characteristics by taking into account the bias dependence of the effective barrier height. The results show that the presence of thin interfacial layer between the metal and semiconductor
Ankara’da erken Bizans dönemi mezar alanı kazısı
(Selçuk Üniversitesi, 2016-06-20) Aydın, Mahmut; Zoroğlu, Candemir
Roma Dönemi’nde Galatia Eyaleti’nin başkentliğini yapan Ankyra kentinin anıtsal yapıları ve diğer çarpıcı kalıntıları ile olası nekropol alanları genellikle Ankara’nın Erken Cumhuriyet Dönemi imar faaliyetleri sırasında gerçekleşen hafriyat çalışmaları ile açığa çıkarılmıştır. Ankara Celal Bayar Bulvarı üzerindeki Gazi Üniversitesi Sıhhiye Kampüsünde inşa edilen Mühendislik ve Mimarlık Fakültesindeki yapılaşma faaliyetleri sırasında ortaya çıkarılan Maltepe Erken Bizans Dönemi Mezar Alanı olasılıkla Ankyra kentinin daha önce bir bölümü tespit edilen güney nekropolü’nün devamı niteliğindedir. Gerçekleştirilen kurtarma kazısı sonucunda bu alanda tahrip edilmiş olası bir kilisenin küçük bir kısmı ve kilise cemaatine ait olması muhtemel beşik tonozlu bir mezar yapısı ortaya çıkarılmıştır.
Application of a pencil graphite electrode for voltammetric simultaneous determination of ascorbic acid, norepinephrine, and uric acid in real samples
(TÜBİTAK, 2018-04-27) Levent, Abdulkadir; Önal, Günay
A pencil graphite electrode (PGE) was used for the simultaneous detection of ascorbic acid (AA), norepinephrine (NE), and uric acid (UA) by differential pulse voltammetry and cyclic voltammetry. The anodic peaks of AA, NE, and UA in their mixture can be well separated in 0.1 M Britton–Robinson buffer solution at pH 4.0. The effects of various experimental parameters such as pH, scan rate, and voltammetric parameters on the voltammetric response of these compounds were investigated. Under optimum conditions, linear calibration graphs were obtained from the AA, NE, and UA concentration ranges, which were 100–800 nM, 20–170 nM, and 40–175 nM, respectively. The detection limits for AA, NE, and UA were 27 nM, 4 nM, and 10 nM in the form of a mixture at the PGE. This electrode shows great analytical performance characteristics, corresponding repeatability and recovery for the simultaneous determination of these compounds. PGE, which was used for the first time in this method, has been successfully applied for the assay of UA in human urine samples with the aim of determining AA and NE in pharmaceutical drugs.
Arkeozooloji biliminin arkeoloji dünyasındaki önemi bölüm 1
(Batman Üniversitesi, 2015) Gündem, Can Yümni
Arkeoloji, bir bilim dalı olarak 18. yy. ortasından bu zamana kadar pek çok değişikliklere ve gelişimlere uğradı. Kazılardan çıkarılan hayvan kalıntılarının incelenmeye başlamasıyla Arkeozooloji doğdu ve bu bilgilerin ışığında artık eski toplumların sosyoekonomik durumlarını daha sağlıklı bir şekilde anlayabiliyoruz. Bu makalede Arkeozooloji biliminin zaman içindeki gelişimini ve temel metotlarını tanıyacağız.
Assessment of heavy metal pollution of urban soils of Batman by multiple pollution indices
(Taylor & Francis, 2021-03-28) Baran, Hacı Alim; Gümüş Kıral, Nurcan
Heavy metal accumulation is observed in urban soils, sometimes due to anthropological effects and sometimes due to natural geological units. In order to determine the heavy metal content of the Upper MioceneLower Pliocene Selmo Formation, which is observed in the whole study area and consists of conglomerate, sandstone and silt stone, soil and river sediment samples were taken. Within the scope of pollution assessment, geo-accumulation index (Igeo), enrichment factor (EF) and pollution index (PI) calculations of Batman urban soil samples were made and different degrees of pollution values were determined. High pollution values were obtained for As, Mo and Sb elements in all pollution indices calculated. The pollution levels of the three elements were determined as strongly to extremely contaminated according to Igeo values, the others except As (very severe enrichment) according to EF values were determined as severe enrichment, and according to PI, all three were determined as strong polluted. Pollution and element distribution maps were created with a geographical information system software. According to the results of correlation analysis and cluster analysis, the elements found to be contaminated are divided into two groups, whose locations and sources of contamination are different. The first group (Sn, Zn and Pb) is observed in the approximate centre of the study area and developed due to traffic emissions. The elements belonging to the second group (especially As, Mo and Sb) show high pollution values in the south-southeast of the study area. These pollutions are thought to be caused by the inadequate storage of mineral oils and batteries that are changed in the industrial site and from leaks in the oil production, storage, refining and transmission phase in TPAO, TÜPRAŞ and BOTAŞ. The analysed samples were compared with the Soil Pollution Control Regulation and WHO standards, and Co, Ni and As element values were found to exceed the permissible values for health
Bazi euphorbia (Euphorbiaceae) tohum türlerinin siniflandirilmasi için yerel ikili örüntüler tabanli bir bilgisayar görü sistemi
(IEEE, 2013) Çalışkan, Abidin; Kaya, Yılmaz; Karabacak, Osman
Bu çalışmada tohum görüntülerin sınıflandırılması için bir bilgisayar görü sistemi önerilmiştir. Sayısal tohum görüntülerinden elde edilen yerel ikili tekdüze örüntüler kullanılarak tohum sınıflandırılması gerçekleştirilmiştir. Çalışmada 240 (120 eğitim ve 120 test) tohum görüntüsü kullanıldı. Öncelikle eğitim setindeki her tohum türü için ortalama tekdüze histogramlar (tohum türü sınıfları) elde edildi. Daha sonra test setindeki her tohum için LBP histogramı üretilip ve tohum türü sınıflarına ait histogramlar ile karşılaştırılarak en yakın komşuluk yöntemi ile sınıflandırma işlemi gerçekleştirildi. Tohum örnekleri arasındaki uzaklıkların hesaplanmasında ise Öklit uzaklığı, hata kareler toplamı, histogram kesişimi ölçütü ve Chi-kare istatistiği kullanıldı. Önerilen yöntem ile tohum görüntülerin %95,83 doğru teşhis edilmiştir. Sonuç olarak tohumların yüzey şekilleri taksonomik ilişkilerin belirlenmesi açısından önemli desen bilgileri barındırdığından bilgisayar görü sistemleri tohum türünün tanımlanmasında önemli avantajlar sağlayacağı öngörülmektedir.
Behaviour of bi adhesive in double strap joint with embedded to bending
(Journal of Theoretical and Applied Mechanics, 2015-06-15) Adin, Hamit; Temiz, Şemsettin; Sülü, İsmail Yasin
In this study, behaviour of bi-adhesive used in the repair of damaged parts was analyzed, using the finite element method. In a double-strap joint with an embedded patch, patch is embedded into the adherents for structural requirements. In addition, to increase the strength of the joint, two adhesives are used to bond the adherents. This approach reduces stress concentration at the overlap ends, increases the load capacity and delays the failure. These effects give rise to higher joint strength. For this purpose, a stiff adhesive, FM73 produced by Cytec Fiberite, was applied in the middle portion of the overlap, while a softer adhesive, SBT9244 from 3M, was applied towards the edges, prone to stress concentrations. Non-linear finite element analyses were carried out to predict the failure loads, to assist with the geometric design and to identify effective ratios of sizes to maximize joint strength. Key words: Bi-adhesive, double-strap joints, finite element analysis, mechanical properties, stress analysis, failure loads
Biodiesel from safflower oil and its application in a diesel engine
(Journals & Books, 2011-03) İlkılıç, Cumali; Aydın, Selman; Behçet, Rasim; Aydın, Hüseyin
Safflower seed oil was chemically treated by the transesterification reaction in methyl alcohol environment with sodium hydroxide (NaOH) to produce biodiesel. The produced biodiesel was blended with diesel fuel by 5% (B5), 20% (B20) and 50% (B50) volumetrically. Some of important physical and chemical fuel properties of blend fuels, pure biodiesel and diesel fuel were determined. Performance and emission tests were carried out on a single cylinder diesel engine to compare biodiesel blends with petroleum diesel fuel. Average performance reductions were found as 2.2%, 6.3% and 11.2% for B5, B20 and B50 fuels, respectively, in comparison to diesel fuel. These reductions are low and can be compensated by a slight increase in brake specific fuel consumption (Bsfc). For blends, Bsfcs were increased by 2.8%, 3.9% and 7.8% as average for B5, B20 and B50, respectively. Considerable reductions were recorded in PM and smoke emissions with the use of biodiesel. CO emissions also decreased for biodiesel blends while NOx and HC emissions increased. But the increases in HC emissions can be neglected as they have very low amounts for all test fuels. It can be concluded that the use of safflower oil biodiesel has beneficial effects both in terms of emission reductions and alternative petroleum diesel fuel.
Biodiesel production from raw cottonseed oil and its characterization
(Energy Education Science and Technolgy Part A, 2011-07) Altun, Şehmus; Yaşar, Fevzi; Öner, Cengiz
In this study, raw cottonseed oil of Turkish origin was transesterified using methyl alcohol and an alkali catalyst to obtain the cottonseed oil methyl ester. The obtained cottonseed oil methyl ester was analyzed by gas chromatography (GC) for determining the fatty acid composition. The fuel-related properties of cottonseed oil methyl ester, cold filter plugging point, cloud point, kinematic viscosity, density, cetane index, flash point, distillation, sulfur content and heating value were determined and compared with those of petroleum diesel fuel and international biodiesel standards. From gas chromatograph analysis, it was found that the cottonseed oil methyl ester has the more amount of total unsaturated FA, therefore, it showed better cold-flow properties than more saturated ones, as expected. Moreover, the fuel-related properties of cottonseed oil methyl ester were within the specified standards
The changes in the serum, liver, kidney protein and genomic DNA profiles in rats treated with 7,12-Dimethylbenz(A) anthracene and Plantago major L.
(RJPBCS, 2014-01) Berber, İsmet; Ekin, Suat; Levent, Abdulkadir; Oto, Gökhan;
In the study, the changes in the serum, liver, kidney protein and genomic DNA profiles in Wistar albino rats administrated to 7,12-dimethylbenz(a)anthracene (DMBA) and Plantagomajor L. were investigated. SDS-PAGE profiling of the serum proteins showed that the levels of two proteins molecular weighing 140.8 kDa and 46.8 kDa were significantly lower on the 0th day of treatment than on the 60th day of application in the groups. Furthermore, two proteins (34.5 and 22.3 kDa) were solely present in DMBA-treated liver cell lysates. On the contrary, the kidney protein profiles did not show significant banding variations in groups. Genomic DNA analysis also confirmed that DNA extracted from liver and kidney cells did not fragment in any of the groups after the 60th study day. The proteins 34.5 and 22.3 kDa in liver cell lysates at the 60th day in DMBA-treated group could be extra-prognostic indicators for severe DMBA toxicity.
Characterization of hazelnut, pistachio, and apricot Kernel Shell particles and analysis of their composite properties
(Taylor & Francis, 2021-05) Çelik, Yahya Hışman; Topkaya, Tolga; Kılıçkap, Erol; Başaran, Eyüp; Yalçın, Rojin
In this study, hazelnut, pistachio, and apricot kernel shells were ground size of 0–300 µm, 300–600 µm, and 600–850 µm. The cellulose, ash, humidity, and metal contents of these powder particles were chemically analyzed and structural properties were characterized using X-Ray Diffraction (XRD) and Fourier Transform Infrared Spectrometer (FT-IR) analysis. Their composites were fabricated by adding 0%, 10%, 20%, and 30% by weight of these powder particles to the polyester matrix material. The effect of chemical and structural properties of the powder particles on the physical, thermal, and mechanical properties of the composites was analyzed. The XRD analysis revealed that cellulose structure observed in powder particles. The peaks observed in their surface functional structures with FT-IR were mainly caused by cellulose and hemicellulose structures. These structures effected humidity and ash ratios. Nitrogen, carbon, hydrogen, and oxygen elements were seen in the structure. In addition, heavy metals such as Sn, Ca, K, Na, Mg, Fe, Ni, Mn, Cu, Zn, and Si were found. Powder particles added to the polyester material adversely affected the tensile strength of the matrix material. However, powder particles added to the matrix material at low rates had a positive effect on bending and compressive strength.
Chemical constituents and biological activities of cirsium leucopsis, c. sipyleum, and c. eriophorum
(Walter de Gruyter, 2015-03-19) Boğa, Mehmet; Köseoğlu Yılmaz, Pelin; Barış Cebe, Deniz; Fatima, Mashhad; Siddiqui, Bina S.; Kolak, Ufuk
Two endemicCirsiumspecies,C. leucopsisDC. andC. sipyleumO. Schwarz, andC. eriophorum(L.) Scop. growing in Turkey were investigated to establish their secondary metabolites, fatty acidcompositions, and antioxidant and anticholinesterase potentials. Spectroscopic methods were usedto elucidate the structures of thirteen known compounds (p-hydroxy-benzoic acid, vanillic acid,cis-epoxyconiferyl alcohol, syringin, balanophonin, 1′-O-methyl-balanophonin, apigenin, kaempferol-3-O-β-D-glucopyranoside, kaempferol-3-O-α-L-rhamnopyranoside, taraxasterol, taraxasterol acetate,β-sitosterol,β-sitosterol-3-O-β-D-glucopyranoside).cis-Epoxyconiferyl alcohol and 1′-O-methyl-balanophonin were isolated for the first time fromCirsiumspecies. Palmitic acid (47.1 %) was foundto be the main fatty acid ofC. leucopsis, linoleic acid in bothC. sipyleum(42.1 %) andC. eriophorum(37.8 %). Assays ofβ-carotene bleaching, scavenging of 1,1-diphenyl-2-picrylhydrazyl (DPPH) freeradicals, 2,2-azinobis (3-ethylbenzothiazoline-6-sulfonic acid) diammonium (ABTS) cation radicals,and superoxide anion radicals, as well as cupric reducing antioxidant capacity (CUPRAC) were usedto determine the antioxidant activities of the extracts and isolated compounds. Vanillic acid, balano-phonin, and kaempferol-3-O-α-L-rhamnopyranoside exhibited strong antioxidant activity. Taraxa-sterol was a potent inhibitor of acetyl- and butyrylcholinesterase activity, respectively.
A comparative morphological and karyological study on hedgehogs, erinaceus concolor and hemiechinus auritus (insectivora: mammalia) in Diyarbakir province
(Kahramanmaraş Sütçü İmam Üniversitesi, 2012-02-09) Ulutürk, Servet; Coşkun, Yüksel
In this study, we examined the morphological and karyological characteristics of Hemiechinus auritus and Erinaceus concolor (4 male, 3 female) in Diyarbakır province. The karyotypes of E. concolor (2n = 48) and H. auritus (2n = 48) were found similar and but distinctly all the autosomal chromosomes of both species were determined to be biarmed in contrast to the some previously published accounts. There are obvious differences on the tooth roots that could be used in key to genera between Hemiechinus and Erinaceus are determined by the results of this study.
Comparison of exhaust emissions of biodiesel–diesel fuel blends produced from animal fats
(Journals & Books, 2015-06) Aydın, Hüseyin; Behçet, Rasim; Oktay, Hasan; Çakmak, Abdülvahap
The present paper examines two biodiesels named as fish oil methyl ester (FOME) and chicken oil methyl ester (CFME) produced from low-cost waste fish and chicken oils using the transesterification method, and their fuel properties were compared to EN 14214 and ASTM D6751 biodiesel standards. Then, each methyl esters were blended with the commercial diesel fuel (D2) with a ratio of 20% on volume basis, respectively and two fuel samples named as FOB20 (20% Fish Oil Methyl Ester and 80% D2 fuel) and CFB20 (20% chicken oil methyl ester and 80% D2 fuel) were obtained. An experimental study for investigating the effects of the blended fuels on engine performance and its exhaust emissions was performed by using a single cylinder, four stroke, direct injection and air-cooled diesel engine at different speeds under full load. According to the test results, it was observed that the brake power, torque values and the carbon monoxide (CO), unburnt hydrocarbon (UHC) and carbon dioxide (CO2) concentrations of blended fuels decreased while the NOx concentration and brake specific fuel consumption (bsfc) values increased compared to diesel fuel.
Conditions of numerical semigroups having maximal or almost maximal length
(International Journal of Physical Sciences, 2012-04-30) Süer, Meral; İlhan, Sedat
The current status of wind energy in Turkey and in the world
(Journals & Books, 2011-02) Aydın, Hüseyin; İlkılıç, Cumali
The rapid increase in world energy demand, the depletion of conventional energy sources and the pollution caused by conventional fuels have increased the importance of developing new and renewable energy sources. Additionally, technological developments have resulted in increased energy demand for the entire world, including Turkey, especially for electrical energy. At present, wind energy is receiving considerable attention. This report focuses on the current status of wind energy in Turkey and in the world. An overview of wind energy in Turkey is presented, and its current status, application, support mechanisms and associated legislation in Turkey are described. Wind energy and its status in the world are also addressed. It can be concluded from this analysis that wind energy utilization in Turkey and throughout world has sharply increased. Turkey has an abundance of wind energy sources.
Dalgacık dönüşümü tabanlı parmak izi tanıma
(IEEE, 2015-06-19) Çalışkan, Abidin; Ertuğrul, Ömer Faruk
Bir biyometrik sistem, bir bireyin sahip olduğu karakteristik veya eşsiz özniteliğe dayalı olarak otomatik tanımlamayı sağlar. Parmak izi, günümüzde birçok alanda geniş bir kullanım alanına sahip bir biyometrik sistemdir. Özellikle insan kimliğinin doğrulanması ve tespit edilmesinde kullanılan parmak izi, erişim için geleneksel olarak kullanılan yöntemlere göre daha güvenilirdir. Bu çalışmada, Gabor dalgacık dönüşümü tabanlı parmak izi tanıma sistemi gerçekleştirilmiştir. Gri seviye parmak izi imgelerinden dalgacık öznitelikleri çıkarılmıştır. Son olarak, parmak izi imgelerinin tanınmasında k en yakın komşuluk sınıflandırıcısı kullanılmıştır. Önerilen algoritma, PolyU yüksek çözünürlüklü parmak izi veri tabanı görüntüleri üzerinde test edilmiştir. Deneysel sonuçlar, önerilen yöntemin mevcut metotların doğruluğunu arttırabildiğini göstermiştir.

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