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Wyświetlanie 1-15 z 70
Tytuł:
Worldwide developments in the field of radiation processing of materials in the down of 21st century
Autorzy:
Chmielewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/146175.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ionizing radiation
polymers
nanomaterials
Opis:
Developments regarding the radiation processing of materials are discussed in the paper. Radiation sources are briefly listed, showing recent achievements in the field. The main group of materials modified by radiation are synthetic polymers and rubber. Other applications are irradiation of semiconductors and gemstone colorization. New, growing fields of application are processing of natural polymers and nanomaterials.
Źródło:
Nukleonika; 2006, 51,suppl.1; 3-9
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of ionizing radiation to environment protection
Autorzy:
Chmielewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/147932.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron accelerator
gamma rays
flue gas
wastewater
sludge
Opis:
Radiation technology may contribute to the environmental protection to a great extent. Electron beam industrial installations for flue gases containing SOx and NOx treatment have been already built in China and Poland. The same technology for high sulphur and high humidity off-gases (low quality lignite) has been successfully tested in an industrial pilot plant in Bulgaria. Pilot plant tests performed in Japan have illustrated that by applying electron beam for municipal waste incinerator off-gases treatment the concentration of dioxins can be reduced by 80%, other persistent organic pollutants can be depredated as well. The positive results of electron beam wastewater treatment are the basis for a full-scale industrial plant being built in the South Korea. A pilot gamma plant for sludge irradiation producing a high grade organic fertilizer is in operation in India. All these achievements are reported in this paper.
Źródło:
Nukleonika; 2005, 50,suppl.3; 17-24
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evolutionary aesthetics as a meeting point of philosophy and biology
Autorzy:
Chmielewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/58890.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Botaniczne
Tematy:
evolutionary aesthetics
philosophy
biology
beauty
morality
sexual selection
Opis:
Metaphysics, or the knowledge of what there is, has been traditionally placed at the pinnacle of philosophical hierarchy. It was followed by theory of knowledge, or epistemology. Practical knowledge of proper modes of conduct, ethics, came third, followed by aesthetics, treated usually in a marginal way as having to do only with the perception of the beautiful. The hierarchy of philosophical disciplines has recently undergone a substantial transformation. As a result, ethics has assumed a central role. The aim of this paper is to suggest that the hierarchy of philosophical disciplines is not yet complete and that one further step needs to be taken. According to the claim advocated here, it is not metaphysics, epistemology or ethics, but aesthetics that is the first and foremost of all philosophical disciplines. This claim is argued for by references to findings of evolutionary aesthetics, especially to Charles Darwin's idea of sexual selection as elaborated in The Descent of Man. I also argue that Darwinian approach to morality is, and should be, derivable from an Darwinian aesthetics which lies at the core of his conception of sexual selection.
Źródło:
Acta Societatis Botanicorum Poloniae; 2012, 81, 2
0001-6977
2083-9480
Pojawia się w:
Acta Societatis Botanicorum Poloniae
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nuclear fissile fuels worldwide reserves
Autorzy:
Chmielewski, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/147011.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nuclear fuel
uranium
thorium
Opis:
The paper reports on the present evaluation of uranium reserves and discusses different possibilities of the efficiency of fissile fuel use including the possibility of fuel reprocessing, MOX fuel application and breeder reactors deployment. The possibility of thorium applications and uranium extraction from law grade ores and other material streams (phosphoric acid, copper leaching solution) are discussed as well.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 11-14
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Chemistry for the nuclear energy of the future
Autorzy:
Chmielewski, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/147120.pdf
Data publikacji:
2011
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
radiochemistry
nuclear chemistry
nuclear chemical engineering
nuclear energy
coolant chemistry
fuel cycle
radioactive waste
radioecology
Opis:
Chemistry - radiochemistry, radiation chemistry and nuclear chemical engineering play a very important role in the nuclear power development. Even at present, the offered technology is well developed, but still several improvements are needed and proposed. These developments concern all stages of the technology; front end, reactor operation (coolant chemistry and installation components decontamination, noble gas release control), back end of fuel cycle, etc. Chemistry for a partitioning and a transmutation is a new challenge for the chemists and chemical engineers. The IVth generation of nuclear reactors cannot be developed without chemical solutions for fuel fabrication, radiation-coolants interaction phenomena understanding and spent fuel/waste treatment technologies elaboration. Radiochemical analytical methods are fundamental for radioecological monitoring of radioisotopes of natural and anthropological origin. This paper addresses just a few subjects and is not a detailed overview of the field, however it illustrates a role of chemistry for a safe and economical nuclear power development.
Źródło:
Nukleonika; 2011, 56, 3; 241-249
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Role of nuclear and radiation technologies in oil, gas and coal mining, distribution and power sector applications
Autorzy:
Chmielewski, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/147271.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
nuclear techniques
radioisotopes
gamma scanning
nuclear gauges
Opis:
Nuclear and radiation technologies play an important role in power sector, starting from fossil fuels exploitation, their transport and distribution and finally power generation. Application of environmental isotopes, stable and radioactive, in ground water monitoring in the vicinity of open cast lignite mine, radon monitor applied for miner’s safety in deep coal mines and nucleonic control systems for ash in coal control are discussed in the paper. Other applications of nuclear techniques reviewed, concern the oil industry, oil field recovery, transportation pipelines and refineries. Finally, the application of beta radiation-based gauges for air borne fly ash monitoring and radiation technology for flue gas treatment are the examples of using this technique in power sector equipped with coal and oil fired boilers.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 55-59
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation decontamination of herbs and spices
Autorzy:
Chmielewski, A.
Migdał, W.
Powiązania:
https://bibliotekanauki.pl/articles/148670.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
herbs
spices
radiation decontamination
bioactive agents
Opis:
A review regarding application of radiation for decontamination of herbs and spices is presented. General principles of the process and the results of the research on biologically active components are discussed. The report regarding the development in this field in selected countries and regions is included.
Źródło:
Nukleonika; 2005, 50, 4; 179-184
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modelling and simulation of repeated charging/discharging cycles for selected nickel-cadmium batteries
Autorzy:
Chmielewski, A.
Szurgott, P.
Powiązania:
https://bibliotekanauki.pl/articles/241905.pdf
Data publikacji:
2015
Wydawca:
Instytut Techniczny Wojsk Lotniczych
Tematy:
dynamic simulation
charging/discharging cycle
MATLAB Simulink
Opis:
The main aim of the paper is to present a developed methodology of simulation of the energy efficiency of a selected energy storage unit. The authors focused their actions on batteries that could be the base for an energy storage system possible to apply in a modernized hybrid-shunting locomotive. Three different nickel-cadmium batteries were selected as representatives for the study. Simulation was focused on repeated cycles of charging and discharging the batteries. The simulation model generally consists of three main components: a specified load cycle, a dynamic model of the DC electrical machine and a model of the Ni-Cd battery. The input data for the battery model is based mostly on the parameters provided by the manufacturer data sheets. However, an internal resistance had to be measured for each battery. Conducted simulations provided information about the electromotive force, state of charge, an average efficiency of the battery, as well as the temperature changes during the cycle. The proposed approach to the battery simulation can be also applied for the loading cycles similar to those that occur during the actual operation of the locomotive. The current study is a part of the project focused on modernization of the diesel-electric shunting locomotive to the hybrid one.
Źródło:
Journal of KONES; 2015, 22, 1; 55-62
1231-4005
2354-0133
Pojawia się w:
Journal of KONES
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
On the distance norms for detecting anomalies in multidimensional datasets
O metrykach odległości dla wielowymiarowych zbiorów danych wykorzystywanych w algorytmie selekcji negatywnej o wartościach rzeczywistych
Autorzy:
Chmielewski, A.
Wierzchoń, S. T.
Powiązania:
https://bibliotekanauki.pl/articles/341047.pdf
Data publikacji:
2007
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
selekcja negatywna
wykrywanie anomalii
norma Minkowskiego z ułamkowym wykładnikiem
odległość kosinusowa
negative selection
anomaly detection
Minkowski norm
fractional distance metric
Opis:
One of the key parameters of algorithms for anomaly detection is the metric (norm) applied to calculate the distance between every two samples which reflect its proximity. It is especially important when we operate on real-valued high dimensional datasets, i.e. when we deal with the problem of intruders detection in computer networks. As observed, the most popular Euclidean norm becomes meaningless in higher than 15-dimensional space. This means that other norms should be investigated to improve the effectiveness of real-valued negative selection algorithms. In this paper we present results for the following norms: Minkowski, fractional distance and cosine.
Jednym z kluczowych parametrów algorytmów wykrywania anomalii jest metryka (norma) służąca do obliczania odległości pomiędzy dwiema próbkami, która odzwierciedla ich podobieństwo. Jest ona szczególnie istotna w przypadkach operowania na zbiorach o wielu wymiarach takich, z jakimi mamy do czynienia w przypadku wykrywania intruzów w sieciach komputerowych. Zaobserwowano, że najczęściej stosowana norma euklidesowa staje się bezużyteczna w przestrzeniach o wymiarach większych niż 15. Oznacza to konieczność stosowania innych norm, które pozwoliłyby na zwiększenie skuteczności algorytmu selekcji negatywnej o wartościach rzeczywistych. W artykule prezentujemy wyniki uzyskane dla normy Minkowskiego, Lm, przy zmianach parametru m w zakresie (0, 2] oraz dla odległości kosinusowej.
Źródło:
Zeszyty Naukowe Politechniki Białostockiej. Informatyka; 2007, 2; 39-49
1644-0331
Pojawia się w:
Zeszyty Naukowe Politechniki Białostockiej. Informatyka
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electron beam flue gas treatment process for purification of exhaust gases with high SO2 concentrations
Autorzy:
Chmielewski, A. G.
Licki, J.
Powiązania:
https://bibliotekanauki.pl/articles/146442.pdf
Data publikacji:
2008
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
high sulphur fossil fuel
flue gas
electron accelerator
SO2 and NOx removal efficiency
absorbed dose
by-product
Opis:
Exhaust gases with high SO2 concentrations are emitted from combustion of high sulphur fossil fuels and from different industrial processes (e.g. copper smelter and sintering plants). The application of the electron beam process for SO2 and NOx removal from such flue gases was investigated. A parametric study was carried out to determine the SO2 and NOx removal efficiency as a function of temperature and humidity of irradiated gases, absorbed dose and ammonia stoichiometry. The efficiency 90–95% of SO2 removal was obtained in the optimal treatment conditions with an inlet SO2 concentration of up to 15% vol. The synergistic effect of high SO2 content on NOx removal was indicated. The collected by-product was a mixture of ammonium sulphate and nitrate. The content of heavy metals in the by- -products was many times lower than the values accepted for commercial fertilizers.
Źródło:
Nukleonika; 2008, 53, suppl. 2; 61-66
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Controls on the distribution of rare earth elements in the Kupferschiefer series of SW Poland
Autorzy:
Oszczepalski, S.
Chmielewski, A.
Mikulski, S.
Powiązania:
https://bibliotekanauki.pl/articles/2060523.pdf
Data publikacji:
2016
Wydawca:
Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
Tematy:
rare earth elements (REE)
redistribution
Kupferschiefer
Zechstein
SW Poland
Opis:
This study deals with the spatial distribution and the PAAS-normalized patterns of rare earth elements (REE) studied by ICP-MS in the Kupferschiefer series of SW Poland. The most characteristic feature is a progressive enrichment in REE content (including Y and Sc) outward from the rocks with pyritic and Pb-Zn mineralisation, across the rocks with copper mineralisation, towards the oxidized (Rote Fäule) areas. The same trend can also be observed with respect to LREE, MREE and HREE. Whereas REE distribution diagrams for shales with pyrite and Pb-Zn mineralisation are almost flat, diagrams for shales with hematite and copper mineralisation are convex-upward and the strongest convexity is attributed to the transition from hematitic alteration to copper-rich rocks. REE distribution diagrams normalized to PAAS show strong MREE enrichment relative to LREE and HREE, which is typically the highest in the hematite zone, lower in shale with copper mineralisation, and the lowest in shales with Pb-Zn and pyrite mineralisation. The systematic increase in the concentration of REE towards the Rote Fäule, and the strong enrichment in MREE in the transition zone are indicative of variable intensity of leaching and formation of the REE enrichments (including MREE) by MREE>HREE>LREE fluids, as evidenced by the MREE-enriched signatures. Overprinting of secondary enrichments over the original REE pattern due to redistribution along the pathways of expanding fluids are postulated to account for the apparent differences in the distribution and concentration of REE (including the MREE-enriched trend) between the oxidized rocks, copper-bearing rocks, and reduced lithologies barren in copper.
Źródło:
Geological Quarterly; 2016, 60, 4; 811--826
1641-7291
Pojawia się w:
Geological Quarterly
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparison of uranium recovery from low-grade ore by bioleaching and acid leaching
Autorzy:
Szolucha, M. M.
Chmielewski, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/109808.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bioleaching
acid leaching
column leaching
low-grade ore
uranium
recovery
shrinking core model
Opis:
The objective of this work was to compare the bioleaching with the acid leaching of uranium under similar process conditions within 65 days. The low-grade uranium ore used in the experiments was collected from Radoniow’s ‘small’ dump, Poland. Bioleaching and acid leaching studies were carried out in identical columns. The isolated bacterial consortium from the Radoniow’s mine was used for the bioleaching process. A solution of sulphuric acid and H2O2 as oxidizing agent was used for the acid leaching. The extraction of uranium under acid leaching conditions reached maximum of 64±13 % w/w after 31 days. The bioleaching of uranium achieved a maximum extraction of 75±15 % w/w after 55 days. In this study an attempt was made to demonstrate the relationship between the shrinking-core model and the experimental data by plotting the fractional conversion of uranium against time.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 136-149
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Kinetic modelling of NO heterogeneous radiation-catalytic oxidation on the TiO2 surface in humid air under the electron beam irradiation
Autorzy:
Nichipor, H.
Sun, Y.
Chmielewski, A. G.
Powiązania:
https://bibliotekanauki.pl/articles/148642.pdf
Data publikacji:
2017
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron beam
catalyst
reaction kinetics
NOx removal
irradiation
modelling
Opis:
Theoretical study of NOx removal from humid air by a hybrid system (catalyst combined with electron beam) was carried out. The purpose of this work is to study the possibility to decrease energy consumption for NOx removal. The kinetics of radiation catalytic oxidation of NO on the catalyst TiO2 surface under electron beam irradiation was elaborated. Program Scilab 5.3.0 was used for numerical simulations. Influential parameters such as inlet NO concentration, dose, gas flow rate, water concentration and catalyst contents that can affect NOx removal efficiency were studied. The results of calculation show that the removal effiiency of NOx might be increased by 8–16% with the presence of a catalyst in the gas irradiated field.
Źródło:
Nukleonika; 2017, 62, 3; 235-240
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sulfur isotope effects for the SO2(g)-SO2(aq) system
Autorzy:
Chmielewski, A.
Derda, M.
Wierzchnicki, R.
Mikołajczuk, A.
Powiązania:
https://bibliotekanauki.pl/articles/146983.pdf
Data publikacji:
2002
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
istotopic fractionation of SO2
mass spectrometer
sulfur isotope effect
Opis:
Sulfur isotope fractionation (34S/32S) factors were determined for the SO2(g)-SO2(aq) system. The influence of temperature on the investigated sulfur isotopes separation between phases was studied as well.
Źródło:
Nukleonika; 2002, 47,suppl.1; 69-70
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Computer simulation of the genetic controller for the EB flue gas treatment process
Autorzy:
Moroz, Z.
Boużyk, J.
Sowiński, M.
Chmielewski, A.
Powiązania:
https://bibliotekanauki.pl/articles/147569.pdf
Data publikacji:
2001
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
genetic algorithm controller
flue gas
Opis:
The use of the computer genetic algorithm (GA) for driving a controller device for the industrial flue gas purification systems employing the electron beam irradiation, has been studied. As the mathematical model of the installation the properly trained artificial neural net (ANN) was used. Various cost functions and optimising strategies of the genetic code were tested. These computer simulations proved, that ANN + GA controller can be sufficiently precise and fast to be applied in real installations.
Źródło:
Nukleonika; 2001, 46, 3; 107-115
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 70

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