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    Wyświetlanie 1-9 z 9
    Tytuł:
    An application of LSC method for the measurement of gross alpha and beta activities in spiked water and drinking water samples
    Autorzy:
    Çakal, G. Ö.
    Güven, R.
    Yücel, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/146427.pdf
    Data publikacji:
    2015
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    alpha activity
    beta activity
    drinking water
    liquid scintillation counting (LSC)
    pulse shape analysis (PSA) calibration
    quench
    Opis:
    In this study, after the pulse shape calibration of a liquid scintillation counting (LSC) spectrometer (Quantulus 1220), the efficiency was determined depending on sample quenching parameters. Then, gross alpha and beta activities in two spiked water samples obtained from International Atomic Energy Agency (IAEA) were used for the validation of the ASTM D7283-06 method, which is a standard test method for alpha and beta activity in water by LSC. Later, the drinking water samples (35 tap water and 9 bottled water) obtained from different districts of Ankara, Turkey, were measured. The maximum gross alpha activities are measured to be 0.08 Bq/L for tap waters and 0.13 Bq/L for bottled waters, whereas the maximum gross beta activities are found to be 0.18 Bq/L for tap waters and 0.16 Bq/L for bottled waters. These results indicate that these drinking water samples are below the required limits, which are 0.1 Bq/L for alpha emitting radionuclides and 1 Bq/L for beta emitting radionuclides. As a result, gross alpha and beta activities in drinking water of Ankara were determined accurately by this validated LSC method. It is also worth noting that LSC is a rapid and accurate method for the determination of gross alpha and beta activities without requiring a tedious sample preparation.
    Źródło:
    Nukleonika; 2015, 60, No. 3, part 2; 637-642
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    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:
    Spatiotemporal Transport Processes in Semiconductor Gas Discharge Structure with GaAs Photodetector
    Autorzy:
    Yűcel Kurt, H.
    Salamov, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1812045.pdf
    Data publikacji:
    2008-10
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.55.Eq
    72.20.Ht
    Opis:
    In a semiconductor gas discharge structure with diameters much larger than an inter-electrode distance, the effects of different parameters (i.e. electrode separation, gas pressure, diameter of the GaAs photodetector, etc.) on electrical breakdown and current oscillations were studied. Non-stationary and non-homogeneous states are generated in the structure, through the spatially uniform irradiation of the semiconductor photodetector. Instabilities occur due to the nonlinear features of the semiconductor photocathode, while the gas discharge serves to visualize transport processes in GaAs. Spatiotemporal variations of current and discharge light emissions are studied with the above-mentioned control parameters. Transformation of the profile and amplitude of the current densities of the filaments in different regions of the current-voltage characteristic are widely studied. Instabilities of spatially non-uniform distributions resulting in the formation of multiple current filaments with increasing voltages above the critical values are observed. A semiconductor gas discharge structure with an N-shaped current-voltage characteristic is analyzed via both the current and discharge light emissions data which shows the electrical instability in the GaAs photodetector.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 4; 819-834
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of thermal neutron detection capability of a CdZnTe detector in a mixed gamma-neutron radiation field
    Autorzy:
    Yücel, H.
    Narttürk, R. B.
    Zümrüt, S.
    Gedik, G.
    Karadag, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/146914.pdf
    Data publikacji:
    2018
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    neutron detection
    CdZnTe
    prompt gamma ray
    thermal neutron
    cadmium
    neutron sensitivity
    241Am-Be source
    Opis:
    The aim of this study was to investigate the thermal neutron measurement capability of a CdZnTe detector irradiated in a mixed gamma-neutron radiation fi eld. A CdZnTe detector was irradiated in one of the irradiation tubes of a 241Am-Be source unit to determine the sensitivity factors of the detector in terms of peak count rate (counts per second [cps]) per neutron flux (in square centimeters per second) [cps/neutron•cm–2•s–1]. The CdZnTe detector was covered in a 1-mm-thick cadmium (Cd) cylindrical box to completely absorb incoming thermal neutrons via 113Cd(n,γ) capture reactions. To achieve, this Cd-covered CdZnTe detector was placed in a well-thermalized neutron fi eld (f-ratio = 50.9 ± 1.3) in the irradiation tube of the 241Am-Be neutron source. The gamma-ray spectra were acquired, and the most intense gamma-ray peak at 558 keV (0.74 γ/n) was evaluated to estimate the thermal neutron fl ux. The epithermal component was also estimated from the bare CdZnTe detector irradiation because the epithermal neutron cutoff energy is about 0.55 eV at the 1-mm-thick Cd filter. A high-density polyethylene moderating cylinder box can also be fi tted into the Cd fi lter box to enhance thermal sensitivity because of moderation of the epithermal neutron component. Neutron detection sensitivity was determined from the measured count rates from the 558 keV photopeak, using the measured neutron fluxes at different irradiation positions. The results indicate that the CdZnTe detector can serve as a neutron detector in mixed gamma-neutron radiation fields, such as reactors, neutron generators, linear accelerators, and isotopic neutron sources. New thermal neutron filters, such as Gd and Tb foils, can be tested instead of the Cd filter due to its serious gamma-shielding effect.
    Źródło:
    Nukleonika; 2018, 63, 3; 59-64
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Investigation of tylosin and tilmicosin residues in meat by high-performance liquid chromatography method
    Autorzy:
    Gürel Yücel, M.
    Seçilmiş, H.
    Taşçı, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/16647456.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    meat
    HPLC
    tilmicosin
    tylosin
    Opis:
    In this study, the presence and level of macrolide group antibiotics (tylosin and tilmicosin) were analyzed by the High-Performance Liquid Chromatography (HPLC) method in a total of 126 raw meat samples, including 42 chicken breast and 84 beef neck, available for consumption in the Burdur province (Turkey). The method demonstrated good linearity (R2 > 0.999) over the assayed concentration range (0.10-10 μg/mL). Intra-day and inter-day recoveries were used to express the accuracy of the method at three different levels of 0.5, 1, 2.5 μg/mL. Intraday recoveries and relative standard deviation values ranged from 97.270 (0.054)% to 98.643 (0.061)%, and inter-day recoveries and relative standard deviation values ranged from 97.057 (0.070)% to 98.197(0.042)% for tylosin. Intraday recoveries and relative standard deviation values ranged from 96.360 (0.065)% to 98.153 (0.046)%, and inter-day recoveries and relative standard deviation values ranged from 96.050 (0.058)% to 97.053 (0.096)% for tilmicosin. The limit of detection (LOD) value was calculated as 0.473 μg/kg for tylosin, and 0.481 μg/kg for tilmicosin; the limit of quantification (LOQ) value was calculated as 1.561 μg/kg for tylosin, and 1.587 μg/kg for tilmicosin. In general, tylosin and tilmicosin were determined in the range of 8-256 μg/kg and 30-447 μg/kg, respectively, in chicken breast meat samples; also, they were detected in the range of 36-1209 μg/kg and 30-1102 μg/kg, respectively, in beef neck meat samples. It was also found that the residues of tylosin and tilmicosin in chicken and beef meats from the market were at a much higher level than the acceptable limits specified in the regulations. This creates serious problems in terms of the ecosystem, food technology, and public health, and causes significant economic losses.
    Źródło:
    Polish Journal of Veterinary Sciences; 2023, 26, 1; 39-46
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    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
      Wyświetlanie 1-9 z 9

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