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    Wyświetlanie 1-5 z 5
    Tytuł:
    Effect of Boric Acid Content on the Structural and Optical Properties of MnS Films Prepared by Spray Pyrolysis Technique
    Autorzy:
    Bedır, M.
    Öztaş, M.
    Çelik, S.
    Özdemır, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1205283.pdf
    Data publikacji:
    2014-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.15.Rs
    78.28.-e
    61.72.Vv
    61.05.cp
    68.55.Jk
    Opis:
    Boron doped MnS films were obtained by the spray pyrolysis method using the boric acid ($H_3BO_3$) as dopant source at a substrate temperature of 350°C. The spray pyrolysis method has a wide range of application areas with a low cost well-suited for the manufacture of solar cells. The properties of boron doped MnS films were investigated as a function of doping concentration. The X-ray analysis showed that the films were polycrystalline fitting well with a hexagonal structure and have preferred orientation in the [002] direction. The optical band gap of the undoped and boron doped MnS films were found to vary from 3.38 to 3.20 eV. The changes observed in the energy band gap and structural properties of the films related to the boric acid concentration are discussed in detail.
    Źródło:
    Acta Physica Polonica A; 2014, 126, 3; 840-844
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pattern Recognition Methods for Detecting Voltage Sag Disturbances and Electromagnetic Interference in Smart Grids
    Autorzy:
    Yalcin, T.
    Ozdemir, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/136160.pdf
    Data publikacji:
    2016
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    C4.5 decision trees
    electromagnetic interference
    feature extraction
    hilbert huang transform
    power quality disturbance
    smart grids
    support vector machines
    Opis:
    Identification of system disturbances, detection of them guarantees smart grids power quality (PQ) system reliability and provides long lasting life of the power system. The key goal of this study is to find the best accuracy of identification algorithm for non-stationary, non-linear power quality disturbances such as voltage sag, electromagnetic interference in smart grids. PQube, power quality and energy monitor, was used to acquire these distortions. Ensemble Empirical Mode Decomposition is used for electromagnetic interference reduction with first intrinsic mode function. Hilbert Huang Transform is used for generating instantaneous amplitude and instantaneous frequency feature of real time voltage sag power signal. Outputs of Hilbert Huang Transform is intrinsic mode functions (IMFs), instantaneous frequency (IF), and instantaneous amplitude (IA). Characteristic features are obtained from first IMFs, IF, and IA. The six features—, the mean, standard deviation,skewness, kurtosis of both IF and IA are then calculated. These features are normalized along with the inputs classifiers. The proposed power system monitoring system is able to detect power system voltage sag disturbances and capable of recognize electromagnetic interference component. In this study based on experimental studies, Hilbert Huang Transform based pattern recognition technique was used to investigate power signal to diagnose voltage sag and in power grid. Support Vector Machines and C4.5 Decision Tree were operated and their achievements were matched for precision and CPU timing. According to the analysis, decision tree algorithm without dimensionality reduction produces the best solution.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2016, 1, 3; 86-93
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The effect of dietary L-arginine intake on the level of antibody titer, the relative organ weight and colon motility in broilers
    Autorzy:
    Bulbul, T.
    Ozdemir, V.
    Bulbul, A.
    Ulutas, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/30881.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    This study was carried out to determine the effect of L-arginine (L-Arg) levels in diet at the starter, grower and finisher phases on immune response, organ development, nitric oxide (NO) metabolism and colon motility in broilers. A total of 500 one-day-old Ross-308 broiler chickens of mixed sex were separated into one Arg-deficient group and four experimental groups. Each group was then divided into five subgroups of 20 birds each. Arginine deficient group for all phases was fed a basal diet which contained 10% less L-Arg than optimum Arg requirement recommended by the breeder. Experimental groups were fed a basal diet supplemented with L-Arg which was progressively 10% increased in groups. Thus, the diet contained 90, 100, 110, 120 and 130% of optimum Arg requirement for each phases in groups, respectively. The highest serum infectious bursal disease antibody titer (IBD) was observed in the experimental group which was fed the diet containing 110% L-Arg at grower phase (P<0.05), whereas Newcastle disease antibody titer did not differ between groups. The relative weight of spleen increased in groups which were fed the diet containing 120 and 130% L-Arg at starter phase as compared to Arg-deficient group (P<0.05). The group which was fed the diet containing 110% L-Arg showed highest relative weight of bursa Fabricii at grower (P<0.05) and finisher (P<0.01) phases. It was observed that serum nitric oxide (NO) concentration decreased in Arg-deficient group (P<0.05). The amplitude of spontaneous colon contractility did not differ between groups at the end of all three phases. However, the frequency of spontaneous colon contractility in the Arg deficient group was higher at starter (P<0.05), grower (P<0.01) and finisher (P<0.05) phases.These results suggest that the supplementation of L-Arg at higher level than optimum Arg requirement in broiler diet has minimal effect on parameters investigated in the study. However, L-Arg-deficiency may negatively affect immune response and the motility of gastrointestinal system due to disruption of NO metabolism at three phases.
    Źródło:
    Polish Journal of Veterinary Sciences; 2014, 17, 1
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of supra-harmonics through signal processing methods in smart grids
    Autorzy:
    Yalcin, T.
    Ozdemir, M.
    Kostyla, P.
    Leonowicz, Z.
    Powiązania:
    https://bibliotekanauki.pl/articles/136245.pdf
    Data publikacji:
    2017
    Wydawca:
    EEEIC International Barbara Leonowicz Szabłowska
    Tematy:
    ensemble empirical mode decomposition
    power quality
    Fourier analysis
    Short Time Fourier Transformation
    Opis:
    Nowadays supra-harmonic distortion studies are gaining attention day by day in power quality research area. When handling communication systems especially Power Line Carrier (PLC) systems in frequency range 2-150 kHz, they are suitable for causing electromagnetic interference (EMI) to other systems. This study shows results of analysis employing advanced method called ensemble empirical mode decomposition (EEMD) to describe supra-harmonic distortion. Unlike the traditional method (short time fourier transform-STFT), EEMD gives extensive representation for supra-harmonic components.
    Źródło:
    Transactions on Environment and Electrical Engineering; 2017, 2, 2; 80-85
    2450-5730
    Pojawia się w:
    Transactions on Environment and Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and comparative strength analysis of wheel rims of a lightweight electric vehicle using Al6063 T6 and Al5083 aluminium alloys
    Autorzy:
    Korkut, T. B.
    Armakan, E.
    Ozaydin, O.
    Ozdemir, K.
    Goren, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/368354.pdf
    Data publikacji:
    2020
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    aluminium alloy wheel
    electric vehicle
    stress analysis
    energy consumption
    stopy aluminium
    pojazd elektryczny
    analiza naprężeń
    zużycie energii
    Opis:
    Purpose: Use of aluminium alloys in critical parts of a vehicle is common since they can combine the two important properties of a material those are being strength and lightweight. The aim in this research is to guide to design process of a wheel with taking example of an electric race vehicle implementation. Design/methodology/approach: In this study, the fatigue strengths of wheels produced for a two-person racing electric vehicle (Demobil09) are evaluated by calculating maximum distortion energy criterion (Von Mises) with Finite Element Analysis. Findings: Aluminium alloy wheels are crucial safety related components and are subjected to static and dynamic loads directly. Using FEA results, the weight and equivalent stress of the wheel are both reduced. So, the energy consumption is also decreased. Modal frequencies of the wheel models are determined. Research limitations/implications: In this paper, the materials analysed are AL6063 T6 and Al5083 aluminium alloys. Different materials can be analysed in future works. Practical implications: This paper is focusing on how to reduce the energy consumption of a two-person electric vehicle concentrating on reducing the weight of vehicle wheels. The vehicle is more technological than mass production cars since it is an electric race car which uses a hub motor, the body and chassis are produced using carbon polymer composites and all electronic units are designed and produced. Although its specialities it has homologated safety equipment like seats and safety belts. Originality/value: All boundary conditions must be analysed in details and a strength analysis must be conducted during design of the wheels for different load cases to ensure the strength of a wheel while keeping the weight as low as possible. In this complex process, this paper can give some clues to designers for strengths and weights of the designs since three different wheel forms are evaluated for reducing energy consumption of the vehicle.
    Źródło:
    Journal of Achievements in Materials and Manufacturing Engineering; 2020, 99, 2; 57-63
    1734-8412
    Pojawia się w:
    Journal of Achievements in Materials and Manufacturing Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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