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Wyświetlanie 1-7 z 7
Tytuł:
The problems with measuring distance in goods wagons
Autorzy:
Młyńczak, J.
Świerniak, M.
Gwóźdź, A.
Powiązania:
https://bibliotekanauki.pl/articles/393842.pdf
Data publikacji:
2011
Wydawca:
Polskie Stowarzyszenie Telematyki Transportu
Tematy:
pomiar odległości
licznik kilometrów
distance measuring
odometer
Opis:
This article presents the current problems with measuring distance in goods wagons. The main problem where goods wagons are concerned is their lack of power supply. Owing to this, a distance-measuring system is hard to install. Meanwhile, the measurement of distance travelled and the service processes dependent on this measurement are becoming more and more important. Moreover, the railway accident in Viareggio on June 29, 2009 has resulted in increased interest in determining the accurate mileage of a wagon or, to be exact, of a wheelset. One has to realise, that a goods wagon is actually a combination of numerous elements (such as the body, the underframe, the carriage, the wheelsets, etc.) that can differ in mileage and can be exchanged between different wagons. This makes it necessary to register not only the mileage of the whole wagon, but also, at a minimum, of the carriage. This article is an attempt at outlining the current state of this issue.
Źródło:
Archives of Transport System Telematics; 2011, 4, 4; 38-41
1899-8208
Pojawia się w:
Archives of Transport System Telematics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Metro as an example of an urban rail system. Four case studies from Europe
Metro jako przykład zurbanizowanego systemu kolejowego.Cztery przykłady z Europy
Autorzy:
Fraszczyk, A.
Magalhaes Da Silva, J.
Gwóźdź, A.
Vasileva, G.
Powiązania:
https://bibliotekanauki.pl/articles/374208.pdf
Data publikacji:
2014
Wydawca:
Politechnika Śląska. Wydawnictwo Politechniki Śląskiej
Tematy:
metro system
urban rail system
comparisons
ticketing
system metro
system kolei miejskich
porównania
specyfikacja techniczna
bilet
Opis:
Underground, tube, subway or metro are common expressions used to describe a rapid transit system serving urban areas. Such a system uses dedicated rail corridors, can run underground or overground, and often includes tunnels and viaducts. Although there are 148 cities in the world with metro systems, each system is different, interms of layout, length, capacity, etc., as it serves different geographical and socioeconomical areas. In this context, the paper presents four European metro systems (Sofia, Warsaw, Lisbon, and Tyne and Wear), introduces the systems dimensions, rolling stock and ticketing strategies and compares similarities and differences between the systems. The analyses suggest a number of recommendations and improvements, which if implemented, could benefit other metro systems in Europe and beyond.
W języku angielskim występuje wiele określeń opisujących metro. System ten wykorzystuje dedykowane korytarze kolejowe, mogące pracować pod ziemią lub nad ziemią i często obejmuje tunele oraz wiadukty. Mimo że istnieje na świecie 148 miast mających systemy metra, każdy system jest inny pod względem układu, długości, pojemności itp., ponieważ występują w różnych układach geograficznych i systemach społeczno-ekonomicznych. W tym kontekście, artykuł prezentuje cztery europejskie systemy metra (Sofii, Warszawy, Lizbony i Tyne and Wear), przedstawia wymiary systemów metra, taboru, strategię biletową i porównuje podobieństwa i różnice pomiędzy nimi. Analizy wskazują wiele zaleceń i usprawnień, które jeżeli zostaną wdrożone, mogą przynieść zysk dla systemów metra w Europie i poza nią.
Źródło:
Transport Problems; 2014, T. 9, z. spec.; 101-108
1896-0596
2300-861X
Pojawia się w:
Transport Problems
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Gamma-tubulin distribution in root cells of soybean (Glycine max L.) seedlings under cadmium stress
Autorzy:
Gzyl, J.
Przymusinski, R.
Gwozdz, E.A.
Powiązania:
https://bibliotekanauki.pl/articles/80983.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
conference
microtubule
gamma-tubulin
root cell
soybean
Glycine max
seedling
cadmium stress
heavy metal
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Dipole-Dipole Interactions on Structural Properties of Gay-Berne Particles
Autorzy:
Gwóźdź, E.
Bródka, A.
Powiązania:
https://bibliotekanauki.pl/articles/2014520.pdf
Data publikacji:
2000-11
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.30.Cz
31.15.Qg
Opis:
Molecular dynamics simulations were performed for a liquid crystal system composed of the Gay-Berne particles with terminal transverse dipole moments. When the dipole-dipole interactions are weak, the isotropic-smectic transition is observed and the transition point shifts towards lower densities as the dipole moment increases. For higher dipole moments the system shows isotropic structure in the whole range of density, and strong dipole-dipole interactions produce two types of dimers that cannot be accommodated into smectic layers.
Źródło:
Acta Physica Polonica A; 2000, 98, 5; 645-649
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of Cyclic Freezing and Thawing on the Hydraulic Conductivity of Selected Aggregates Used in the Construction of Green Roofs
Autorzy:
Gwóżdź, K.
Hewełke, E. A.
Sas, W.
Żakowicz, S.
Baryła, A.
Powiązania:
https://bibliotekanauki.pl/articles/124495.pdf
Data publikacji:
2016
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
aggregates
freeze-thaw durability
hydraulic conductivity
green roofs
Opis:
The construction of a green roof requires drainage which ought to be characterized by adequate hydraulic conductivity and be resistant to changing meteorological conditions during the winter period. A properly functioning drainage system guarantees the reliability of the entire green roof system. The article presents studies on the freeze-thaw durability and hydraulic conductivity of selected aggregates applied for constructing green roof drainage systems. The aggregates were subjected to a cyclic freezing and thawing process in 30 and 70 cycles. The obtained results indicate that the conductivity of aggregates studied using the constant head method decreases along with an increase in the number of freeze-thaw cycles they were subjected to. This means that the indicator of freeze-thaw durability can have an indicative nature in the assessment of the usefulness of selected aggregates for constructing drainage layers. The conducted studies indicate that the deciding parameter when selecting an aggregate ought to be its hydraulic conductivity, determined accounting for the changes taking place in the freeze-thaw cycles. The equations of changes in the conductivity of aggregates indicated by the authors make it possible to assess them for practical purposes.
Źródło:
Journal of Ecological Engineering; 2016, 17, 4; 50-56
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Generator with modulated magnetic flux for wind turbines
Autorzy:
Gwóźdź, M.
Krystkowiak, M.
Jędryczka, C.
Gulczyński, A.
Matecki, D.
Powiązania:
https://bibliotekanauki.pl/articles/201397.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
current modulator
PMSG
power electronics converter
renewable energy source
wind turbine
modulator
konwerter elektroniki
odnawialne źródło energii
turbina wiatrowa
Opis:
In the paper, the concept of a permanent magnet synchronous generator (PMSG) with uniquely designed stator windings for wind turbines is presented. Two 3-phase windings in the stator are used, one of which is connected in the star, while the other in the delta configuration. Six-pulse rectifiers, mutually coupled by the pulse transformer, whose primary winding is supplied by the so-called “current modulator”, are placed at the outputs of both windings. The modulator output current should meet all the necessary and strict requirements. Both rectifiers operate on a common DC circuit. These solutions provide the sinusoidal magnetomotive force in the stator of the PMSG and the quasi-sinusoidal (taking into account the non-linearity of the magnetic circuit) magnetic flux. In light of the generator principle, it has been called the “PMSG with modulated the magnetic flux”. The slightly higher complexity in the structure of the generator, as compared to the normal three-phase construction, is compensated by the exceptional simplicity of the power electronics section of the system, which allows high efficiency to be reached. The current modulator (as well as the pulse transformer) is a power electronics converter with a relatively low output power as compared to the overall output power of the system. In comparison to other known solutions, the expected cost of the system should be lower. It is also expected that a high degree of reliability in terms of its operation will be achieved, and consequently, that the the ongoing costs of its maintenance will be reduced. In the paper, concept, theoretical basis of operation, and results of the studies of the simulation models of the generator, including the basic power electronics section, are presented.
Źródło:
Bulletin of the Polish Academy of Sciences. Technical Sciences; 2017, 65, 4; 469-478
0239-7528
Pojawia się w:
Bulletin of the Polish Academy of Sciences. Technical Sciences
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Studying of Perovskite Nanoparticles in PMMA Matrix Used as Light Converter for Silicon Solar Cell
Autorzy:
Lipiński, M.
Socha, R. P.
Kędra, A.
Gawlińska, K.
Kulesza-Matlak, G.
Major, Ł.
Drabczyk, K.
Łaba, K.
Starowicz, Z.
Gwóźdź, K.
Góral, A.
Popko, E.
Powiązania:
https://bibliotekanauki.pl/articles/356850.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
perovskite nanoparticles
light converters
solar cells
solar energy materials
Opis:
The nanoparticles of CH3NH3PbBr3 hybrid perovskites were synthesized. These perovskite nanoparticles we embedded in polymethyl methacrylate (PMMA) in order to obtain the composite, which we used as light converter for silicon solar cells. It was shown that the composite emit the light with the intensity maximum at about 527 nm when exited by a short wavelength (300÷450 nm) of light. The silicon solar cells were used to examine the effect of down-conversion (DC) process by perovskite nanoparticles embedded in PMMA. For experiments, two groups of monocrystalline silicon solar cells were used. The first one included the solar cells without surface texturization and antireflection coating. The second one included the commercial cells with surface texturization and antireflection coating. In every series of the cells one part of the cells were covered by composite (CH3NH3PbBr3 in PMMA) layer and second part of cells by pure PMMA for comparison. It was shown that External Quantum Efficiency EQE of the photovoltaic cells covered by composite (CH3NH3PbBr3 in PMMA) layer was improved in both group of the cells but unfortunately the Internal Quantum Efficiency was reduced. This reduction was caused by high absorption of the short wavelength light and reabsorption of the luminescence light. Therefore, the CH3NH3PbBr3 perovskite nanoparticles embedded in PMMA matrix were unable to increase silicon solar cell efficiency in the tested systems.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 3; 1733-1739
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-7 z 7

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