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Wyszukujesz frazę "tracer" wg kryterium: Temat


Tytuł:
Radon in the dry carbon dioxide spa of Mátraderecske, Hungary
Autorzy:
Sóki, E.
Csige, I.
Powiązania:
https://bibliotekanauki.pl/articles/148459.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
dry CO2 spa
mofette
radon
tracer
Opis:
The final product of a post-volcanic activity is the exhalation of low-temperature (<100°C) gases containing mostly carbon dioxide. The phenomenon is called mofettes, which are often used for therapeutic treatments in the form of dry CO2 spas. Along its pathway to the surface, the deep origin gas also intakes different radon isotopes from the rocks and soils; therefore, the risks associated with radon exposures should also be a concern. In this work, we have found that the 222Rn activity concentration in the mofette gas of Mátraderecske is particularly high; it is in the order of 200 kBq•m–3. However, owing to the carefully designed flow pattern of mofette gas and fresh air, the radon level is about 1 kBq∙m–3 at the breath level of the staff, accompanying the treatment, which is the radon reference level for workers in Hungary. We have also found that in this dry spa, radon is a good tracer of CO2; therefore, it can be used to monitor the CO2 distribution in the treatment pools.
Źródło:
Nukleonika; 2016, 61, 3; 245-249
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of hydrodynamic model based on tracer test performed in WWT plant in Kędzierzyn Koźle, Poland
Autorzy:
Frącz, P.
Wotzka, D.
Powiązania:
https://bibliotekanauki.pl/articles/377993.pdf
Data publikacji:
2016
Wydawca:
Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
Tematy:
Bardenpho WWT plant
HRT
tracer test
RTD modeling
Opis:
Analysis results of lithium chloride concentrations, which were measured during tracer test performed in wastewater treatment (WWT) plant placed in Kędzierzyn–Koźle, Poland, are presented in the paper. The considered WWT plant operates with a five-stage Bardenpho system for organic content reduction within activated sludge process (ASP). One of the significant factors, which have an impact on the efficiency of the ASP in a biological reactor, is its hydraulic behavior. In this study theoretical and actual retention times were determined by using of mathematical modeling. Three single and multistream dispersion models were applied, i.e. Tanks-in-Series, Extended Tanks-in-Series and a model based on the MARTIN method. Using the last model it was possible to identify multiple wastewater flows in the reactors, which include: main flow and short circuiting flows. Furthermore, it was stated that the theoretical retention times differ from the actual values, obtained through mathematical modeling.
Źródło:
Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 88; 175-185
1897-0737
Pojawia się w:
Poznan University of Technology Academic Journals. Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The use of the fluorescence phenomenon to evaluate the content of feed ingredients
Wykorzystanie zjawiska fluorescencji do oceny zawartości składników pasz
Autorzy:
Matuszek, D.
Powiązania:
https://bibliotekanauki.pl/articles/336437.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Przemysłowy Instytut Maszyn Rolniczych
Tematy:
feed
tracer
homogeneity
fluorescence
pasza
traser
homogeniczność
fluorescencja
Opis:
This paper presents the results of the evaluation of feed quality conducted on the basis of the content of a tracer coated with a fluorescent substance. The study used the example of compound feed mixture for laying hens. Feed ingredients: maize and kardi primed wet using fluorescent solutions. The substances, such as Tinopal, Uranine and Rhodamine B were excited to shining by ultraviolet radiation. Before mixing process started, two tracers coated with different fluorescent substances were introduced into the mixture. The acquired images of the samples were analysed using the Patan computer program and were the basis of the information about the percentage share of the specified key component. The tests were used to verify the premise that there is a possibility of simultaneous determination of several components in a mixture based on fluorescent method. The results confirmed this assumption.
W pracy przedstawiono wyniki oceny jakości paszy w oparciu o zawartość składnika kluczowego pokrytego substancją fluorescencyjną. Badania przeprowadzono na przykładzie wieloskładnikowej mieszanki paszowej dla kur niosek. Składniki paszy: kukurydze i kardi zaprawiano na mokro rozworami fluorescencyjnymi. Zastosowane substancje: tinopal, uranina i rodamina B wzbudzano do świecenie promieniowaniem ultrafioletowym. Pozyskane obrazy próbek poddawano analizie w programie komputerowym Patan, na podstawie którego uzyskiwano informacje o procentowej zawartości wskazanego składnika kluczowego. Do mieszanki przed rozpoczęciem procesu mieszania wprowadzano dwa trasery pokryte różnymi substancjami fluorescencyjnymi. Testy miały posłużyć do weryfikacji założenia, że istnieje możliwość jednoczesnego oznaczenia zawartości kilku składników w jednej mieszance w oparciu o metodę fluorescencyjną. Uzyskane wyniki potwierdziły założenie.
Źródło:
Journal of Research and Applications in Agricultural Engineering; 2017, 62, 2; 72-75
1642-686X
2719-423X
Pojawia się w:
Journal of Research and Applications in Agricultural Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluorescence optical analysis method for assessing homogeneity of granular mixtures
Autorzy:
Matuszek, Dominika B.
Królczyk, Jolanta B.
Powiązania:
https://bibliotekanauki.pl/articles/1848991.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fluorescence
ultraviolet radiation
homogeneity
multicomponent granular mixtures
tracer
Opis:
This paper presents a method of optical fluorescence analysis for the evaluation of homogeneity of multicomponent grain mixtures. This method is based on the evaluation of the content of fluorescent marker. Maize with two degrees of fineness d1 = 1.25 mm and d2 = 2.00 mm was used as a tracer. Maize was covered with Rhodamine B, which emits red light under the influence of ultraviolet radiation. The tracer was introduced into the mixture before the mixing process began. Nine multicomponent grain mixtures were used. The proportion of fluorescent maize was evaluated on the basis of computer image analysis. Additionally, the fraction of the tracer was evaluated using a control method (validation of the accuracy of the proposed method). The results indicate that the degree of the tracer’s fineness influences the results obtained. The use of fluorescent maize with particle size d2 = 2.00 mm allowed to obtain results which differed less from the control method. The average size of the difference in results ranged from 0.20-0.38 for the 2.00 mm tracer and 0.38-1.34 for the 1.25 mm tracer.
Źródło:
Metrology and Measurement Systems; 2021, 28, 1; 41-54
0860-8229
Pojawia się w:
Metrology and Measurement Systems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Local distributions of fluid velocity and tracer concentration in a tank reactor
Autorzy:
Makowski, Ł.
Orciuch, W.
Powiązania:
https://bibliotekanauki.pl/articles/185289.pdf
Data publikacji:
2011
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PLIF
PIV
LES
prędkość
tracer concentration
fluid velocity
Opis:
The aim of the project was to collect experimental data regarding local distributions of fluid velocity and inert tracer concentration in a tank reactor with turbulent flow. The experiments were performed in a microscale in a region of tracer fluid injection. The results of experiments can be used for direct validation of currently developed CFD models, particularly for time-dependent mixing models used in LES.
Źródło:
Chemical and Process Engineering; 2011, 32, 1; 33-40
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Natural radioactivity of coastal sediments as tracer in dynamic sedimentology
Autorzy:
Thereska, J.
Powiązania:
https://bibliotekanauki.pl/articles/146496.pdf
Data publikacji:
2009
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
gamma natural radioactivity
coastal sediments
natural tracer
lithology
sediment dynamics
Opis:
Natural radioactivity of coastal sediments could provide interesting information on sediment dynamics. Natural radioactivity measurements were performed in two areas of the Adriatic Sea littoral of Albanian cost, in the gulfs of Durres and Vlora, where complex studies were carried out in the framework of the maintenance of existing Durres harbour and the design of a new harbour in Vlora. Dynamic mapping of the gamma total radioactivity at the sea bottom sediment was carried out using a 2" × 2" NaI probe. Radiometric data were converted to lithological map, and the sand and silt distribution configuration was interpreted in terms of sediment transport. The obtained results have shown that the natural radioactivity of sediments provides qualitative data about the sediment dynamics. This cost-effective method is recommended to be used as complementary to other tracer techniques for sediment transport in coastal engineering investigations.
Źródło:
Nukleonika; 2009, 54, 1; 45-50
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Deterministic versus stochastic modelling of unsaturated flow in a sandy field soil based on dual tracer breakthrough data
Autorzy:
Nützmann, Gunnar
Maciejewski, Stanisław
Gorczewska-Langner, Wioletta
Powiązania:
https://bibliotekanauki.pl/articles/2201207.pdf
Data publikacji:
2022
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
unsaturated flow
tracer transport
breakthrough curve
deterministic modelling
stochastic modelling
Opis:
The 216 km2 Neuenhagen Millcreeck catchment can be characterized as a drought-sensitive landscape in NE Germany. It is therefore of fundamental human interest to understand how water that fell as precipitation moves through the unsaturated soils and recharges groundwater. Additionally, a better knowledge of nutrient transport from soil to groundwater is important, especially in landscapes with light sandy soils. For a better understanding of these processes a dual tracer field experiment with bromide (Br–) and deuterium (D2O) was carried out some years ago. The aim of the present study is to use the results of this experiment to model tracer transport in the unsaturated zone via two different concepts, the classical deterministic advection-dispersion equation and a new stochastic approach. The advantage of the stochastic modelling method proposed here for field-scale tracer application is to produce reliable information about expected total solute fluxes from the unsaturated zone to groundwater and about mean transit times. Moreover, this allows one to evaluate the mass of solute in the soil profile and to determine the range of water velocity fluctuations. Field experiments should be concentrated on estimation of fluctuation of water flow velocity to make stochastic models more accurate. To summarize, this work contributes to new modelling methods for the simulation of water and solute transport in unsaturated sandy soils which are heavily affected by droughts and irregular hydrological processes in the subsurface.
Źródło:
Geological Quarterly; 2022, 66, 4; art. 66, no. 37
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stable isotope deuterium as a natural tracer of mixing processes in rivers
Autorzy:
Palige, J.
Ptaszek, S.
Zimnicki, R.
Chmielewski, A. G.
Wierzchnicki, R.
Powiązania:
https://bibliotekanauki.pl/articles/146756.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
stable isotopes
tracer
deuterium
oxygen-18
river
water flow
Opis:
The possibility of application of naturally existing differences in isotope contents 18O/16O, 2H/1H in waters for investigation of transport and mixing of various waters in the tributary-river system is presented. Experiments carried out on the Bug-Narew rivers-Zegrze Lake and the BugoNarew-Vistula rivers systems have indicated that the hydrogen isotope ratio 2H/1H can be used as an intrinsic tracer of natural mixing processes occurring in rivers. The IRMS methodology was used for isotope ratio measurement of water samples. The degrees of water mixing as a function of distance from the confluence point of rivers were determined. The obtained results indicate that in water systems where the natural differences in ?2H are higher than 5‰ this technique can replace the time-consuming and expensive dye (or radiotracer) dispersion tests for evaluation of pollutant transport in rivers.
Źródło:
Nukleonika; 2008, 53, 2; 63-67
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pupils’ Opinions on Digital Systems Education Enriched by DCBLP Discourse
Autorzy:
Hapl, Lukáš
Kostolányová, Kateřina
Habiballa, Hashim
Powiązania:
https://bibliotekanauki.pl/articles/1964300.pdf
Data publikacji:
2021-09-30
Wydawca:
Wydawnictwo Adam Marszałek
Tematy:
DCBLP
digital systems
e-learning
Packet Tracer
students’ opinions
Opis:
The article presents knowledge about the modified e-learning on-line synchronous teaching of digital systems, which took place in the period of widespread closure of schools during almost the entire school year 2020/2021 at a secondary school with an IT focus. The importance of teaching digital systems in computer science and the integration of teaching into available lessons is briefly clarified. Furthermore, the content of teaching is presented, including its modification by elements of programming by DCBLP discourse and links to existing knowledge about this use from previous years. The subject of research interest will be the specific effects of changes on students’ opinions regarding the content of the subject. For this purpose, a qualitative investigation based on the design of the grounded theory will be used. The work brings partial knowledge that can serve as additional material for the determination of other research questions, hypotheses and identification of potential problems in teaching. The results show the pupils’ interest in the digital systems enriched by the programming discourse reveals the possible perception of a long time distance learning in this area.
Źródło:
The New Educational Review; 2021, 65; 200-210
1732-6729
Pojawia się w:
The New Educational Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The CFD modeling in bioreactor tracer studies
Autorzy:
Zima, P.
Powiązania:
https://bibliotekanauki.pl/articles/1933153.pdf
Data publikacji:
2007
Wydawca:
Politechnika Gdańska
Tematy:
mathematical modeling
pollutant migration
reactor hydraulics
advection-dispersion equation
tracer studies
Opis:
This paper presents the effects of dispersion on predicting longitudinal tracer concentration profiles in an activated sludge bioreactor located at the Wschód Waste-Water Treatment Plant in Gdansk. The aim of this study has been to use the one-dimensional advection-dispersion equation to simulate a non-active substance flow (based on the measured tracer concentration). The simulation results were compared with those obtained in the traditional tanks-in-series approach, commonly used in designing biological reactors. The dispersion coefficient was calculated from a statistical formula based on differences in the tracer concentration distributions at two sampling points. The study has shown that the numerical simulation using the one-dimensional tracer migration equation yields better results than the tanks-in-series model in predicting longitudinal tracer concentration profiles. This paper is an in-troduction to the study of reactive substances in activated sludge bioreactors.
Źródło:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk; 2007, 11, 4; 439-447
1428-6394
Pojawia się w:
TASK Quarterly. Scientific Bulletin of Academic Computer Centre in Gdansk
Dostawca treści:
Biblioteka Nauki
Artykuł

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