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Tytuł:
Technology of oxygen production in the membrane-cryogenic air separation system for a 600 MW oxy-type pulverized bed boiler
Autorzy:
Berdowska, S.
Skorek-Osikowska, A.
Powiązania:
https://bibliotekanauki.pl/articles/240451.pdf
Data publikacji:
2012
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
kriogeniczny rozdział powietrza
membranowy separator
produkcja tlenu
cryogenic air separation
membrane air separation
oxygen production
Opis:
In this paper the results of the thermodynamic analysis of the oxy-combustion type pulverized bed boiler integrated with a hybrid, membrane-cryogenic oxygen separation installation are presented. For the calculations a 600 MW boiler with live steam parameters at 31.1 MPa /654.9[degrees]C and reheated steam at 6.15 MPa/672.4[degrees]C was chosen. In this paper the hybrid membrane-cryogenic technology as oxygen production unit for pulverized bed boiler was proposed. Such an installation consists of a membrane module and two cryogenic distillation columns. Models of these installations were built in the Aspen software. The energy intensity of the oxygen production process in the hybrid system was compared with the cryogenic technology. The analysis of the influence of membrane surface area on the energy intensity of the process of air separation as well as the influence of oxygen concentration at the inlet to the cryogenic installation on the energy intensity of a hybrid unit was performed.
Źródło:
Archives of Thermodynamics; 2012, 33, 3; 65-76
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
PARENT–CHILD SEPARATION IN ANGOLAN TRANSNATIONAL FAMILIES
Autorzy:
Marinho, Luena
Powiązania:
https://bibliotekanauki.pl/articles/579709.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
PARENT- CHILD SEPARATION
TRANSNATIONAL FAMILIES
MIGRATION
Opis:
Globalization increased the number of transnational families all over the world. The way of life created by transnationalism leads to changes in family relationships, creates a specific dynamics, implies care at distance and produces various forms of parenting. Starting from the analysis of transnational families between Angola and Portugal, the aim of this paper is to understand the effects of migration on parent-child relationship trying to perceive how parenting at a distance is conceived by the actors: migrant parents in Portugal and children in Angola. Drawing on interviews made with migrant parents and children, the paper explores the functioning of the parental relationship at distance.
Źródło:
Studia Migracyjne - Przegląd Polonijny; 2014, 40, 3(153); 187-202
2081-4488
2544-4972
Pojawia się w:
Studia Migracyjne - Przegląd Polonijny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Membrane separation of carbon dioxide in the integrated gasification combined cycle systems
Autorzy:
Kotowicz, J.
Skorek-Osikowska, A.
Janusz-Szymańska, K.
Powiązania:
https://bibliotekanauki.pl/articles/240308.pdf
Data publikacji:
2010
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
IGCC
separacja membranowa
CCS
membrane separation
Opis:
Integrated gasification combined cycle systems (IGCC) are becoming more popular because of the characteristics, by which they are characterized, including low pollutants emissions, relatively high efficiency of electricity production and the ability to integrate the installation of carbon capture and storage (CCS). Currently, the most frequently used CO2 capture technology in IGCC systems is based on the absorption process. This method causes a significant increase of the internal load and decreases the efficiency of the entire system. It is therefore necessary to look for new methods of carbon dioxide capture. The authors of the present paper propose the use of membrane separation. The paper reviews available membranes for use in IGCC systems, indicates, inter alia, possible places of their implementation in the system and the required operation parameters. Attention is drawn to the most important parameters of membranes (among other selectivity and permeability) influencing the cost and performance of the whole installation. Numerical model of a membrane was used, among others, to analyze the influence of the basic parameters of the selected membranes on the purity and recovery ratio of the obtained permeate, as well as to determine the energetic cost of the use of membranes for the CO2 separation in IGCC systems. The calculations were made within the environment of the commercial package Aspen Plus. For the calculations both, membranes selective for carbon dioxide and membranes selective for hydrogen were used. Properly selected pressure before and after membrane module allowed for minimization of energy input on CCS installation assuring high purity and recovery ratio of separated gas.
Źródło:
Archives of Thermodynamics; 2010, 31, 3; 145-164
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Religijność instytucjonalna jako czynnik adaptacji polskich imigrantów w Irlandii
Institutional Religiosity as a Factor in the Adaptation of Polish Immigrants in Ireland
Autorzy:
Lisak, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/579697.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
POLISH MIGRANTS
IRELAND
RELIGION
CATHOLICISM
INTEGRATION
SEPARATION
Opis:
A high level of adherence with Catholicism is one of the cultural similarities between the cohort of Polish immigrants living in Ireland and the rest of the Republic of Ireland’s population. Sharing the same religious beliefs seems to be a social bridge that accelerates mutual acceptance and adjustment at the time of massive migration. Therefore, the article aims to evaluate the integrative function of institutional religiousness. The fi ndings show that both the Polish immigrants and the natives tend to separate from one another instead of integrating, though. With regard to the bonding function of institutional religiousness, a high level of intercultural competence among religious leaders is required. It is evident, however, that neither the Irish Catholic church nor the chaplaincy for Polish immigrants have such skilful and integrative leaders.
Źródło:
Studia Migracyjne - Przegląd Polonijny; 2015, 41, 2 (156); 97-121
2081-4488
2544-4972
Pojawia się w:
Studia Migracyjne - Przegląd Polonijny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical investigation of particle separation in a centrifugal air separator
Autorzy:
Kaczyński, J.
Kraft, M.
Powiązania:
https://bibliotekanauki.pl/articles/175534.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CFD simulation
discrete particle model
particle separation
Opis:
This paper presents the modeling approaches and results of numerical investigations into particle separation in a production-scale industrial centrifugal air separator. The gaseous phase was modeled using an Eulerian formulation, while the particle phase was modeled using a Lagrangian particle tracking approach. Two-way coupling between continuous and disperse phase was included and turbulence modeled using the realizable k-ε model. The resulting comprehensive system model provides correct predictions of the power consumption and of pressure losses in the device over the full operation range, and proved ability of accurately predicting the size-dependent particle separation efficiencies down to nominal particle sizes of 2 µm.
Źródło:
Transactions of the Institute of Fluid-Flow Machinery; 2017, 135; 57-71
0079-3205
Pojawia się w:
Transactions of the Institute of Fluid-Flow Machinery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Simultaneous Analysis of Vibrations and Noise in the Task of Minimizing Vibroacoustic Activity of Machines
Autorzy:
Dąbrowski, Z.
Dziurdź, J.
Powiązania:
https://bibliotekanauki.pl/articles/177692.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
signal separation
noise minimizing
frequency response function
Opis:
Simultaneous propagation of vibrations and noise has an important role in the task of minimizing vibroacoustic hazards on the station of operator of the construction machinery. In many cases vibrations transferred by the construction are processed to noise in different points of the machine. As a result, they may increase the level of noise at the workplace. The paper presents the proposition of a simple estimation of noise and vibration propagation paths of the machine. On the basis of the analysis of hydraulic excavator an effectiveness of a proposed procedure was shown. This procedure helps to minimize the transfer of vibrations of power unit in selected frequency ranges which led to the change of overall noise level in operator’s cab about 5 dB.
Źródło:
Archives of Acoustics; 2016, 41, 2; 303-308
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Separation of Ho3+ in Static Magnetic Field
Autorzy:
Kołczyk, K.
Wojnicki, M.
Kutyła, D.
Kowalik, R.
Żabiński, P.
Cristofolini, A.
Powiązania:
https://bibliotekanauki.pl/articles/355096.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
rare earth metals
REE
recycling
separation
magnetic field
Opis:
The rare earths elements (REE) belong to the group of critical metals and they are achieving more and more interest due to their special properties. However, there occur some problems connected with their production. The most difficult phase is separation of REE. It includes a necessity to intensify currently applied processes and looking for new solutions. The present work introduces an idea to use differences in physical properties of the REE ions to get them separated. In the experimental part of the work some efforts were undertaken to analyse results presenting changes of holmium ions concentration under an influence of the magnetic field gradient. There was determined the gradient of magnetic field and concentration of Ho3+ ions depending on initial concentration of the solution and time. A simulation of changing the concentration of holmium ions in the solution under an influence of the magnetic field gradient was performed to compare the mathematical model with the obtained results.
Źródło:
Archives of Metallurgy and Materials; 2016, 61, 4; 1919-1924
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Classification of Music Genres Based on Music Separation into Harmonic and Drum Components
Autorzy:
Rosner, A.
Schuller, B.
Kostek, B.
Powiązania:
https://bibliotekanauki.pl/articles/177566.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
music information retrieval
musical sound separation
drum separation
music genre classification
support vector machine (SVM)
co-training
nonnegative matrix factorization
Opis:
This article presents a study on music genre classification based on music separation into harmonic and drum components. For this purpose, audio signal separation is executed to extend the overall vector of parameters by new descriptors extracted from harmonic and/or drum music content. The study is performed using the ISMIS database of music files represented by vectors of parameters containing music features. The Support Vector Machine (SVM) classifier and co-training method adapted for the standard SVM are involved in genre classification. Also, some additional experiments are performed using reduced feature vectors, which improved the overall result. Finally, results and conclusions drawn from the study are presented, and suggestions for further work are outlined.
Źródło:
Archives of Acoustics; 2014, 39, 4; 629-638
0137-5075
Pojawia się w:
Archives of Acoustics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recovery of Iron from Copper Slag by Carbothermic Reduction and Magnetic Separation in the Presence of CaO
Autorzy:
Chun, T.
Mu, G.
Di, Z.
Long, H.
Ning, C.
Li, D.
Powiązania:
https://bibliotekanauki.pl/articles/355597.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
copper slag
recovery of iron
carbothermic reduction
magnetic separation
Opis:
The carbothermic reduction of copper slag at the different binary basicity (CaO/SiO2 ) was carried out for recovering iron by wet magnetic separation. Calcium carbonate is found to be capable of improving the iron recovery, as well as increasing the particle size of metallic iron significantly. Experimental evidence showed that CaO reacted with SiO2 to form calcium silicate and FeO was liberated from the 2FeO.SiO2 , decreased the content of Fe in the slags, which improved the iron recovery during the magnetic separation. The final product, assaying 90.23%Fetotal (representing a metallization degree of 93.94%) and 0.58% Cu at the iron recovery of 85.70% was achieved at the basicity of 0.60, which can be briquetted as a burden material for weathering resistant steel making by electric arc furnace to replace part of scrap.
Źródło:
Archives of Metallurgy and Materials; 2018, 63, 1; 299-305
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Diffusive–inertial droplet separation model from two-phase flow
Autorzy:
Mikielewicz, Jarosław
Dolna, Oktawia
Kwidziński, Roman
Powiązania:
https://bibliotekanauki.pl/articles/1955019.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
two-phase flow
diffusive-inertial droplet separation
stopping distance
Opis:
This paper concerns analytical considerations on a complex phenomenon which is diffusive-inertial droplet separation from the twophase vapour-liquid flow which occurs in many devices in the power industry (e.g. heat pumps, steam turbines, organic Rankine cycles, etc.). The new mathematical model is mostly devoted to the analysis of the mechanisms of diffusion and inertia influencing the distance at which a droplet separates from the two-phase flow and falls on a channel wall. The analytical model was validated based on experimental data. The results obtained through the analytical computations stay in a satisfactory agreement with available literature data.
Źródło:
Archives of Thermodynamics; 2021, 42, 3; 141-158
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Variation of constant formulas for fractional difference equations
Autorzy:
Anh, P. T.
Babiarz, A.
Czornik, A.
Niezabitowski, M.
Siegmund, S.
Powiązania:
https://bibliotekanauki.pl/articles/229367.pdf
Data publikacji:
2018
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
fractional difference equation
variation of constant
separation of solutions
Opis:
In this paper, we establish variation of constant formulas for both Caputo and Riemann-Liouville fractional difference equations. The main technique is the Z-transform. As an application, we prove a lower bound on the separation between two different solutions of a class of nonlinear scalar fractional difference equations.
Źródło:
Archives of Control Sciences; 2018, 28, 4; 617-633
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of selected parameters on the efficiency and economic charactersistics of the oxy-type coal unit with a membrane-cryogenic oxygen separator
Autorzy:
Kotowicz, J.
Berdowska, S.
Powiązania:
https://bibliotekanauki.pl/articles/240290.pdf
Data publikacji:
2016
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
oxygen production
membrane air separation
produkcja tlenu
membranowy separator
Opis:
In this paper a 600 MW oxy-type coal unit with a pulverized bed boiler and a membrane-cryogenic oxygen separator and carbon capture installation was analyzed. A membrane-cryogenic oxygen separation installation consists of a membrane module and two cryogenic distillation columns. In this system oxygen is produced with the purity equal to 95%. Installation of carbon capture was based on the physical separation method and allows to reduce the CO2 emission by 90%. In this work the influence of the main parameter of the membrane process – the selectivity coefficient, on the efficiency of the coal unit was presented. The economic analysis with the use of the break-even point method was carried out. The economic calculations were realized in view of the break-even price of electricity depending on a coal unit availability.
Źródło:
Archives of Thermodynamics; 2016, 37, 1; 73-85
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical modeling of CO2 separation process
Autorzy:
Remiorz, L.
Rulik, S.
Dykas, S.
Powiązania:
https://bibliotekanauki.pl/articles/240653.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
CO2 separation
thermoacoustic
CFD
separacja CO2
termoakustyka
Opis:
Paper presents the results of numerical modelling of a rectangular tube filled with a mixture of air and CO2 by means of the induced standing wave. Assumed frequency inducing the acoustic waves corresponds to the frequency of the thermoacoustic engine. In order to reduce the computational time the engine has been replaced by the mechanical system consisting of a piston. This paper includes the results of model studies of an acoustic tube filled with a mixture of air and CO2 in which a standing wave was induced.
Źródło:
Archives of Thermodynamics; 2013, 34, 1; 41-53
1231-0956
2083-6023
Pojawia się w:
Archives of Thermodynamics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A separation principle for Takagi-Sugeno control fuzzy systems
Autorzy:
Hadj Taieb, N.
Hammami, M. A.
Delmotte, F.
Powiązania:
https://bibliotekanauki.pl/articles/229205.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
T-S model
PDC controller
fuzzy observer
separation principle
Opis:
An important application of state estimation is feedback control: an estimate of the state (typically the mean estimate) is used as input to a state-feedback controller. This scheme is known as observer based control, and it is a common way of designing an output-feedback controller (i. e. a controller that does not have access to perfect state measurements). In this paper, under the fact that both the estimator dynamics and the state feedback dynamics are stable we propose a separation principle for Takagi-Sugeno fuzzy control systems with Lipschitz nonlinearities. The considered nonlinearities are Lipschitz or meets an integrability condition which have no influence on the LMI to prove the stability of the associated closed-loop system. Furthermore, we give an example to ullistrate the applicability of the main result.
Źródło:
Archives of Control Sciences; 2019, 29, 2; 227-245
1230-2384
Pojawia się w:
Archives of Control Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Membrane gas separation module with pulsed retentate for low-permeable component recovery
Autorzy:
Battalov, Stanislav V.
Trubyanov, Maxim M.
Puzanov, Egor S.
Sazanova, Tatyana S.
Drozdov, Pavel N
Vorotyntsev, Ilya V.
Powiązania:
https://bibliotekanauki.pl/articles/185429.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
membrane gas separation
unsteady-state operation
process intensification
separation
efficiency
membrane module
separacja gazów membranowych
operacja niestabilna
intensyfikacja procesu
separacja
wydajność
moduł membranowy
Opis:
The paper presents the experimentalstudy of a novel unsteady-statemembrane gas separation approachfor recovery of a slow-permeant component in the membrane module with periodical retentate with-drawals. The case study consisted in the separation of binary test mixtures based on the fast-permeantmain component (N2O, C2H2) and the slow-permeant impurity (1% vol. of N2)using a radial counter-current membrane module. The novel semi-batch withdrawal technique was shown to intensify theseparation process and provide up to 40% increase in separation efficiency compared to a steady-stateoperation of the same productivity.
Źródło:
Chemical and Process Engineering; 2019, 40, 1; 57--65
0208-6425
2300-1925
Pojawia się w:
Chemical and Process Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 68

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