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    Wyświetlanie 1-12 z 12
    Tytuł:
    Analytical and experimental vibration analysis of telescopic platforms
    Autorzy:
    Yucel, A.
    Arpaci, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/949115.pdf
    Data publikacji:
    2016
    Wydawca:
    Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
    Tematy:
    telescopic platforms
    modal analysis
    finite element method
    vibration
    Opis:
    In this study, vibration analysis of a telescopic platform is conducted, and the platform structure is reconstructed to satisfy vibrational standards. The analysis is realised using solid modelling, finite elements and an analytical method. The results are verified using experimental modal techniques. Through the finite element and experimental modal approach free vibration analysis is carried out and natural frequencies are determined. Additionally, vibration accelerations of the structure are obtained by forced vibration analysis of the model. All calculations one performed on the new reconstructed structure, and it is determined whether the reconstructed structure satisfies the vibrational standards.
    Źródło:
    Journal of Theoretical and Applied Mechanics; 2016, 54, 1; 41-52
    1429-2955
    Pojawia się w:
    Journal of Theoretical and Applied Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of trend changes in degree-day values of heating and cooling: broiler breeding case
    Autorzy:
    Yucel, A.
    Atilgan, A.
    Erdem, N.
    Oz, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/101664.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    broiler
    linear regression analysis
    spearman rank correlation test
    temperature
    trend analysis
    Opis:
    An ideal broiler house should be designed to minimize the effects of weather changes and to keep indoor conditions at the comfort temperature of the animals. In this case, this should be done with minimum cost and possible lowest operating costs. Degree-day methods are used in order to have knowledge of the energy need of any structure. With this method, the measured values or meteorological data can be used to give information about the heating and cooling energy quantities of structures. Depending on the climate change in recent years, the changes need to be examined that have taken place in order to provide optimum comfort in animal barn. Isparta province and districts were selected as the study area. The longterm average daily temperature values are used from meteorological stations of the selected region. The heating and cooling degree day values were calculated for selected balance temperatures in broiler breeding. Linear Regression Analysis and Spearman Rank Correlation Test were conducted to determine the changes of these values due to climate change. In conclusion, it was determined that there were statistically significant trends at 5% significance level in Egirdir (21°C), Isparta (31-29-25 and 23°C), Kasimlar (18°C), Senirkent (31-29-25-23 and 21°C), Sutculer (all selected balance temperature values) and Yalvac (31-29-25-23 and 21°C) in terms of heating degree-day values, and in Atabey (29-25-23-21 and 18°C), Barla (25-23 and 21°C), Isparta (23-21 and 18°C), Senirkent (29- 25-23-21 and 18°C), Sutculer (29-25-23-21 and 18°C), Sarkikaraagac (25-23-21 and 18°C), Uluborlu (25-23-21 and 18°C) and Yalvac (25-23-21 and 18°C) in terms of cooling degree-day values. As a result, it has been concluded that more energy consumption will be a concern for heating and cooling of the broiler house that will be built in the province of Isparta.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2017, II/2; 645-660
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The investigation of relationship of heating and cooling degree hour calculations for Southeastern Anatolia Region with altitude, latitude and longitude
    Autorzy:
    Yucel, A.
    Atilgan, A.
    Oz, H.
    Saltuk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/101504.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    altitude
    cooling
    degree-hours
    heating
    latitude
    longitude
    Opis:
    Degree-day values can be calculated using climatic data. Thus, seasonal, monthly, daily and hourly energy requirements for heating and cooling in buildings can be calculated. The effect of outside ambient temperature can be determined by means of the degree-day method in determining the basic temperature values in buildings. The altitude and latitude affect significantly the temperature distribution in the Earth. Thus, the latitude and altitude values are required to determine the degree hour values. This study was taken in 9 provinces located in the Southeastern Anatolia Region (SAR). The annual outdoor dry-bulb thermometer temperatures for a long period of nine provinces in the SAR were obtained to determine heating and cooling degree hour values according to the six different base temperatures. According to the suggested six different base temperature values, the cumulative long-term annual heating degree-hour (HDH) value was 50862 in total for Gaziantep province. The lowest cumulative long-term annual heating degree-hour value took place in Sanliurfa province as 39638. Also, the highest total cooling degree-hour (CDH) value took place in Sanliurfa province as 10886 degree-hour value and the lowest value took place in Sirnak province as 3909. It was determined that there was not an exact linear or monotonous relationship between HDH and CDH values and altitude, latitude and longitude values. However, although it was seen that the relationship of CDH values with the altitude was not a formal linear or monotonous relationship, it was determined that CDH values decreased linearly together with the increasing altitude values when the values were examined.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2016, III/1; 673-683
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The determination of heating and cooling day values using degree-day method: tomato plant example
    Autorzy:
    Yucel, A.
    Atilgan, A.
    Oz, H.
    Saltuk, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/62259.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    determination
    heating value
    cooling value
    degree days method
    tomato plant
    greenhouse
    Opis:
    Based on the amount and duration of external temperature, degree day values are determined according to whether the selected equilibrium temperature is lower or higher than the air temperature. Degree day values are calculated according to the fluctuations in ambient temperature. It can be understood whether heating or cooling systems are necessary within the calculated periods. In this study, the meteorological data of Antalya region dating back many years and the temperature values suggested according to the cultivation periods of tomato in greenhouse environment have been used as material. The daily average temperature values recorded for many years have been compared with the equilibrium temperature values selected for the tomato plant thereby calculating the heating and cooling day values for each cultivation period. Tomato cultivation in greenhouses is carried out in 2 periods in the region in spring and autumn. At the end of these two periods, it was determined that the heating degree days in autumn were determined to be higher than that in spring. Whereas cooling degree days were determined to be greater for autumn cultivation in comparison with that of spring cultivation. Information regarding the energy consumption of an agricultural structure can be obtained beforehand via the heating and cooling degree day values. It has been surmised that such studies will help in making estimations regarding the energy need of various agricultural structures as well as gaining insight in the planning of the design stages that are directly related to the energy consumption of the building such as heating, cooling and ventilation.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2014, IV/1
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of optimum heating and cooling degree-hour values for pepper plant
    Autorzy:
    Atilgan, A.
    Yucel, A.
    Tanriverdi, C.
    Oz, H.
    Tezcan, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/101263.pdf
    Data publikacji:
    2017
    Wydawca:
    Polska Akademia Nauk. Stowarzyszenie Infrastruktura i Ekologia Terenów Wiejskich PAN
    Tematy:
    cooling
    degree-hour
    heating
    Kumluca
    Opis:
    Information on the energy needs of agricultural production activities carried out in any region can be obtained in advance. Many methods are used for this purpose. One of them is a degree-hour method. Kumluca district of Antalya province where pepper cultivation is done intensively was chosen as a study area. The growers prefer autumn production of pepper plants inside the greenhouses in this region. Production starts in early October and last until June. The long-term (1960-2015) thermometer temperatures in the study area were obtained from the Turkish State Meteorological Service. In this study, by using only meteorological data, during each growing season (planting, flowering, pollination, fruit ripening and harvesting) were obtained degree-hour values for the pepper plant and evaluated with Student-t test. Regression coefficients were obtained by correlating heating and cooling degree-hour values with different temperature values which are recommended during the vegetative growing season for the pepper plant. Regression analysis was performed between obtaining heating and cooling degree-hour values (dependent variable) and annual mean heating and cooling degree hour values (independent variable) which are suggested basic temperature values. In conclusion, the regression coefficients were determined as 0.99 for out of greenhouse heating degree-hour and as 0.90-0.99 for cooling degree-hour, respectively. Heating and cooling-hour values were found between 0.96-0.88 and 0.99-0.87, respectively. It was determined that there are very high correlations in the positive direction. According to different growing seasons of pepper, knowing how much less or more of heating and cooling degree-hour values is needed, one can give information in advance in terms of energy consumption or usage. Areas or regions where less energy is to be used can be determined in terms of agricultural production to be done in any region.
    Źródło:
    Infrastruktura i Ekologia Terenów Wiejskich; 2017, II/1; 457-467
    1732-5587
    Pojawia się w:
    Infrastruktura i Ekologia Terenów Wiejskich
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Chromatographic Determination of Stabilizer in Nitrocellulose Based Propellants. (A new extraction based chromatographic method for the determination of stabilizers in propellants)
    Autorzy:
    Yücel, A.
    Inal, E. K.
    Akay, M. A.
    Atakol, O.
    Öz, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/358506.pdf
    Data publikacji:
    2011
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    HPLC
    propellants
    nitrocellulose based propellants
    energetic materials
    explosives
    Opis:
    Regarding the chromatographic analysis of the stabilizers in the double based propellants, nitrocellulose causes an interference problem with diphenylamine and its derivatives. In this study, specifc extraction of the stabilizer was planned before the chromatographic analysis and the stabilizer was extracted into CHCl3 by means of a soxhylet extraction in order to eliminate this problem. Then, most of the CHCl3 was evaporated under hydrothermal conditions and the residue was analyzed with HPLC after being dissolved in MeCN. By means of an isocratic work, the stabilizer 2-nitro diphenylamine (2NDPA) was clearly detected with 85% MeCN and 15% H2O carrier phase in C18 column. The effect of the matrix that could be found in the ambient was examined and the recovery was found between 95.06 +/-3.09 - 99.88 +/-3.34%. No matrix effect was determined in the ambient.
    Źródło:
    Central European Journal of Energetic Materials; 2011, 8, 3; 183-192
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determining water and sediment quality related to lead-zinc mining activity
    Autorzy:
    Yucel, D. S.
    Baba, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/205465.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    metal contamination
    Pb-Zn mining
    river sediment
    Umurbey dam basin
    water resources
    water quality
    Opis:
    This study focuses on the Koru and Tesbihdere Pb-Zn mining districts, located at the upstream areas of the Umurbey dam basin. Mining activities in Koru, one of the longest operated mines in NW Turkey, date back to the beginning of the 1900s. The purpose of the study is to (1) determine the hydrochemical properties of the water resources and to assess the potential environmental consequences of mining activities in the Koru and Tesbihdere mining districts, and (2) investigate the effects caused by mining activities on the water resources and sediment quality in the Umurbey dam basin. Concentrations of As, Cd, Cu, Fe, Mn, Pb, and Zn in river sediments downstream of the Tesbihdere and Koru mining district, and in the Umurbey dam sediments were higher than the world average for river sediments. The geoaccumulation index and enrichment factor revealed that sediments were strongly polluted with Pb and Zn, moderately to strongly polluted with Cd and moderately polluted with Cu. The chemical analyses of water resources revealed that the maximum Fe, Zn, Pb, Mn, and Cu concentrations reached 2890 μg/l, 1785 μg/l, 1180 μg/l, 984 μg/l, and 419 μg/l, respectively. The Koru River is classified as polluted water according to Turkish inland water quality regulations. The environmental contamination problems in the local drainage system are caused by leakage from past and current tailing ponds into the Koru River.
    Źródło:
    Archives of Environmental Protection; 2018, 44, 3; 19-30
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fabrication and Transport Critical Current Densities of $MgB_2//Fe//Cu$ Multifilament Tapes without Any Intermediate Annealing
    Autorzy:
    Yucel, E.
    Terzioglu, C.
    Varilci, A.
    Gencer, A.
    Belenli, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/1489874.pdf
    Data publikacji:
    2012-03
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    74.70.Ad
    84.71.Mn
    74.62.-c
    74.25.Sv
    74.25.F-
    Opis:
    We have fabricated superconducting 6 and 7 filaments $MgB_2//Fe//Cu$ tapes by ex situ powder-in-tube method using Cu-sheath without any intermediate annealing. Properties of two different multicore $MgB_2//Fe//Cu$ tapes annealed at 900C for 2 h in high purity argon gas atmosphere were compared. The samples were characterized using scanning electron microscope, X-ray diffraction, electron dispersive spectroscopy, optical microscopy, critical transition temperature, transport critical current density, and magnetic measurements. Transport critical current densities of the 6 and 7 filaments tapes were found to be 450 A/cm^2 and 190 A/cm^2 at 20 K, respectively. From X-ray diffraction measurements, lattice parameters a and c were determined. From dc resistivity measurements, the connectivity between grains was investigated by using Rowell's connectivity analysis.
    Źródło:
    Acta Physica Polonica A; 2012, 121, 3; 660-665
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    235U isotopic characterization of natural and enriched uranium materials by using multigroup analysis (MGA) method at a defined geometry using different absorbers and collimators
    Autorzy:
    Yücel, H.
    Yeltepe, E.
    Yüksel, A. Ö.
    Dikmen, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/146510.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    nuclear safeguards
    enrichment measurements
    uranium
    multigroup analysis
    enrichment meter principle
    Opis:
    Characterization of nuclear materials is an important topic within the context of nuclear safeguards, homeland security and nuclear forensics. This paper deals with the performance of multigroup gamma-ray analysis (MGA) method using the X- and γ-rays in the 80–130 keV region and enrichment meter principle (EMP) based on the analysis of 185.7 keV peak for a certain geometry using different absorbers and collimators. The results from MGA and those of EMP are compared. In particular, the effect of aluminum/lead absorbers and lead collimator on the enrichment determination of 235U in natural and low enriched samples is investigated in a given source- -detector geometry. The optimum diameter/height ratio for the Pb-collimator is found to be Dc/Hc = 1.4–1.6 in the chosen geometry. In order to simulate the container walls, ten different thicknesses of Al-absorbers of 141 to 840 mg·cm–2 and six different thicknesses of Pb-absorbers of 1120–7367 mg·cm–2 are interposed between sample and detector. The calibration coefficients (% enrichment/cps) are calculated for each geometry. The comparison of the MGA and EMP methods shows that the enrichment meter principle provides more accurate and precise results for 235U abundance than those of MGA method at the chosen geometrical conditions. The present results suggest that a two-step procedure should be used in analyses of uranium enrichment. Firstly MGA method can be applied in situ and then EMP method can be used at a defined geometry in laboratory.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 615-620
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Enzymatic activity of a novel halotolerant lipase from Haloarcula hispanica 2TK2
    Autorzy:
    Ozgen, M.
    Attar, A.
    Elalmis, Y.
    Birbir, M.
    Yucel, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/779584.pdf
    Data publikacji:
    2016
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    Haloarcula hispanica
    extremely halophilic archaea
    extremozyme
    lipase
    lipolytic activity
    Opis:
    A strain of Haloarcula hispanica isolated from Tuzkoy salt mine, Turkey exhibited extracellular lipolytic activity. Important parameters such as carbon sources and salt concentration for lipase production were investigated. Optimal conditions for the enzyme production from Haloarcula hispanica 2TK2 were determined. It was observed that the lipolytic activity of Haloarcula hispanica was stimulated by some of the carbon sources. The high lipase acitivity values were obtained in the presence of 2% (v/v) walnut oil (6.16 U/ml), 1% (v/v) fish oil (5.07 U/ml), 1% (v/v) olive oil (4.52 U/ml) and 1% (w/v) stearic acid (4.88 U/ml) at 4M NaCl concentration. Lipase was partially purified by ammonium sulfate precipitation and ultrafiltration. Optimal temperature and pH values were determined as 45oC and 8.0, respectively. Lipase activity decreased with the increasing salt concentration, but 85% activity of the enzyme was maintained at 5M NaCl concentration. The enzyme preserved 41% of its relative activity at 90oC. The partially purified lipase maintained its activity in the presence of surfactants such as Triton X-100 and SDS. Therefore, the lipase which is an extremozyme may have potential applications especially in detergent industry.
    Źródło:
    Polish Journal of Chemical Technology; 2016, 18, 2; 20-25
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Radiation Shielding Properties of Spark Plasma Sintered Boron Carbide-Aluminium Composites
    Autorzy:
    Buyuk, B.
    Tugrul, A.
    Cengiz, M.
    Yucel, O.
    Goller, G.
    Sahin, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401941.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.20.Dc
    81.05.Je
    Opis:
    In this study gamma and neutron attenuation properties of boron carbide-aluminium (B₄C-Al) composites were investigated. B₄C-Al composites were produced by spark plasma sintering method. Aluminum percentages in the B₄C-Al composites were 0%, 10%, 15%, and 20% by volume. The composite materials were performed against gamma and neutron sources. Cs-137 and Co-60 gamma radioisotopes were used as gamma sources and Pu-Be neutron howitzer was used for neutron source. Theoretical mass attenuation coefficients were determined by using XCOM computer code and compared with the experimental results. It has been seen that the experimental results were close to the theoretical results. Total macroscopic cross-sections of the samples were determined for Pu-Be neutrons. It is concluded that increasing aluminum ratio in the B₄C-Al composites causes higher gamma attenuation behavior for Cs-137 and Co-60 gamma sources and the total macroscopic cross-sections of the B₄C-Al composites decrease by increasing Al concentration.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-132-B-134
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Processing, Mechanical and Nuclear Characterization of Boron Carbide Ceramics Consolidated by Spark Plasma Sintering
    Autorzy:
    Cengiz, M.
    Ozer, S.
    Buyuk, B.
    Tugrul, A.
    Yucel, O.
    Goller, G.
    Sahin, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/1401969.pdf
    Data publikacji:
    2015-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    25.20.Dc
    81.20.Ev
    Opis:
    Boron carbide (B₄C) ceramics were produced by spark plasma sintering technique with 5, 10, 15, and 20 vol.% aluminum (Al) in order to improve sintering behaviours of B₄C ceramics. B₄C ceramics were produced, having square cross-section and 50 × 50 × 5 mm³ dimensions. The sintering process was carried out at different temperatures by applying 40 MPa of pressure with 100°C/min under vacuum. The effects of various amounts of Al additive and sintering temperature on density, vickers hardness, fracture toughness and microstructure were examined. The hardness and fracture toughness of the samples were evaluated by the Vickers indentation technique. Microstructures of the samples were characterized by scanning electron microscopy technique. Fast neutron attenuation properties of the ceramics having highest density were also investigated.
    Źródło:
    Acta Physica Polonica A; 2015, 128, 2B; B-187-B-189
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-12 z 12

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