Wyniki wyszukiwania - BazTech

1

Nomenklatura trybów pracy urządzeń pokładowych systemu ERTMS/ETCS w warunkach polskiej sieci kolejowej

Gruba Ł., Kochan A., Koper E., Ilczuk P.

Prace Naukowe Politechniki Warszawskiej. Transport

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2018

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z. 121

67--84

PL

Niniejszy artykuł dotyczy polskiej nomenklatury trybów pracy urządzeń pokładowych systemu ERTMS/ETCS. W artykule przedstawiono opisy trybów pracy, przytoczono używane w polskiej literaturze nazewnictwo konkretnych trybów oraz przedstawiono propozycję polskiego nazewnictwa każdego z nich. W artykule ponadto zwrócono uwagę na potrzebę ujednolicania nazewnictwa oraz rozpropagowania wiedzy na temat trybów pracy urządzeń pokładowych systemu ERTMS/ETCS.

EN

This article refers to the nomenclature of modes of ERTMS/ETCS on-board equipment. The article presents descriptions of modes, the naming of specific modes used in Polish literature and the proposal of Polish naming of each of them. Moreover, article draws attention to the need of unifying the nomenclature and propagation of knowledge about the modes of the ERTMS/ETCS on-board equipment.

2

Influence of the core size on light propagation in photonic liquid crystal fibers

Sala-Tefalska M. M., Ertman S., Woliński T. R., Mergo P.

Opto-Electronics Review

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2017

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Vol. 25, No. 3

198--204

EN

In this paper analyses of mode distribution, confinement and experimental losses of the photonic crystal fibers with different core sizes infiltrated with liquid crystal are presented. Four types of fibers are com-pared: with single-, seven-, nineteen-and thirty seven solid rods forming the core in the same hexagonal lattice of seven “rings” of unit cells (rods or capillaries). The experimental results confirming the influence of the core diameter on light propagation are also included. The diameter of cores determines not only the number of modes in the photonic liquid crystal fiber but also is correlated with experimentally observed attenuation. For fibers with larger cores confinement losses are expected to be higher, but the measured attenuation is smaller because the impact of liquid crystal material losses and scattering is smaller.

3

Investigation and Study of Mode Splitting in Near Field Inductive Communication Systems

Thanh H. D., Agbinya J. I.

International Journal of Electronics and Telecommunications

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2013

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Vol. 59, No. 2

185-194

EN

Frequency splitting is a near field inductive communication phenomenon where the resonant frequency divides into many separate frequencies or to different modes. In this paper, we show that this phenomenon depends on the coupling coefficients or the natural response of the circuit by using the circuit theory to derive these splitting frequencies. Also, the rules for the general matrix that is used to solve for splitting frequencies are also demonstrated clearly. Mode splitting is observed for peer-to-peer, three coils and four coil systems due to the existence of the nearest and second neighbour interactions. In particular, two, three and four modes have been analysed for two, three, and four coil systems respectively. However, the number of modes for these systems can be changed according to the degree of coupling. The differences in the resultant splitting frequencies with and without the second neighbour interaction are shown in the simulation results. Furthermore, we assess the system performances regarding to power efficiency through the inductive transfer functions. Besides, either coupling coefficients at resonance or the simplified transfer functions in some specific scenarios can be obtained by having an insight into these transfer functions. Finally, we recognise and propose that splitting frequency phenomenon can be deployed to transmit signals at many frequencies concurrently.

4

Analiza pewnych cech dynamicznych modeli kości ramienia człowieka

Nowak M., Ziemiański D.

Czasopismo Techniczne. Mechanika

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2011

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R. 108, z. 1-M

175-183

PL

W artykule, korzystając z nowoczesnych pakietów informatycznych, podjęto próbę badania wybranych własności dynamicznych kości kończyny górnej człowieka poprzez budowę odpowiednich modeli metodą MES przy założonych warunkach brzegowych. Otrzymane wyniki numeryczne i analityczne dotyczące drgań własnych przedstawiono w formie tabeli.

EN

In this paper, using modern informatics packets, an attempt to study the chosen dynamic properties of human upper limb bones by building appropriate models using FEM with the assumed boundary conditions was applied. Obtained numerical results and analysis of vibrations are presented in tabular form.

5

Rozszerzenie możliwości zastosowania tłumienia modalnego w diagnostyce dużych obiektów

Hoszwa K., Osiński J., Osipiak M., Żach P.

Diagnostyka

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2006

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nr 1(37)

23-30

PL

W pracy przedstawiono możliwości zastosowania tłumienia modalnego w diagnostyce dużych obiektów, takich jak: nadwozia samochodów lub kadłuby obiektów pływających i latających. W opisie tłumienia wykorzystano warunek Caughe'ya. Kompozytowy dach samochodu Polonez Kombi przebadano metodą analizy modalnej. Model tłumienia z wykorzystaniem warunku Caughe'ya umożliwia rozprzęganie równań ruchu. Zastosowanie proponowanego modelu tłumienia umożliwia uzyskanie znacznie lepszego przybliżenia właściwości tłumiących struktury kompozytowej (w porównaniu z modelem Rayleigha).

EN

The paper presents the possibility of model damping application to diagnostics of the large objects, such how: the body of cars or hulks of swimming and flying objects. Caughey condition is used in description of damping model. the composite roof of the car Polonez Kombi was investigated by Modal Analysis Method. Damping model used Caughey condition make possible decoupling of equations of movement. Application pf proposed damping model make possible getting better approximation of dissipative composite structure proprieties (comparatively by the Rayleigh model).

6

Left-edge solid varieties of differential groupoids

Arworn Sr., Denecke K.

Demonstratio Mathematica

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1999

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Vol. 32, nr 1

1-11

EN

An identity s=t is called a hyperidentity in a variety V if by substituting terms of appropriate arity for the operation symbols in s=t, one obtains an identity satisfied in V. Such substitutions are called hypersubstitutions. In the paper we consider hyperidentities and hypersubstitutions in the variety of differential groupoids, certain idempotent and medial groupoids. differential groupoids are modes as defined in [Rom-S;85]. We show that this variety and all its subvarieties are left-edge solid.