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Fault diagnostics in a traction circuit by means of the stray current analysis

100%

Neumann A. , Paleček J.

Przegląd Elektrotechniczny

2016

tom R. 92, nr 6

160--162

This paper deals with the forming of stray currents in industrial spurs, stabling tracks and special purpose tracks near DC-electrified tracks. It describes methods which can be used to identify failures that lead to the occurrence of stray currents. Some innovative measuring methods are also introduced, all of them are based on results and knowledge obtained by practical experiments. The data and measurement results used in this paper come from measurements performed in the Bohumín railway station depot. It was found out that at this railway station, traction current leaked into the lightning control system. The method that was used in tracing these parasitic current paths, as well as the failures which led to the occurrence of these currents, are described in this paper.

W artykule analizowano prądy rozproszone w bocznicach przemysłowych i torach w pobliżu trakcji DC. Pozwala to na wykrywanie uszkodzeń prowadzących do wzrostu tych prądów.

The constant radiance term

80%

Neumann L. , Neumann A. , Prikryl J. , Purgathofer W.

Machine Graphics and Vision

1998

tom Vol. 7, No. 3

535-549

This paper describes a fundamential improvement for all rendering methods that evaluate the rendering equation in any complexity. The "constant Radiance Term" accelerates the computation of multiple interreflections in arbitrary non-diffuse environments. It is an extension of the constant radiosity step untroduced ealiner for solving radiosity problems and does not require geometrical nor visibility information. A constant radiance portion is extracted from the solution in every surface point and every direction. The residuum problem can be solved faster or with reduced variance by all known methods that consider non-diffuse light interreflections, like different versions of distribution ray tracing, deterministic and stochastic radiosity methods, and hybrid solutions. The constant radiance value is chosen in such a way that the total self-emitted power of the residuum problem is zero so that after the extraction of the constant part there are places with positive self-emittance and places with positive self-emittance and places with negative self emittance. The achieved acceleration can be significant for environments with many bright coloured surfaces. Using a decomposition into separate positive and negative problems it is possible to apply the technique even when using turnkey rendering software.

Reflectance models by pumping up the albedo function

80%

Neumann L. , Neumann A. , Szirmay-Kalos L.

Machine Graphics and Vision

1999

tom Vol. 8, No. 1

3-17

The paper introduces a method, called the albedo pumping-up, to derive new, physically plausible BRDFs from an axisting one or from any symmetric function. This operation can be applied recursively arbitrary number of times. An important application of this operation is the transformation of the Phong and Blinn models in order to make them produce metallic effects. The paper also examines the albedo function of reflectance models and comes to the conclusion that widely used models violate energy balance at grazing angles.

Intra and inter-stock variability in sterlet (Acipenser ruthenus) as assessed with biometric and genetic analyses

70%

Kempter J. , Hofsoe P. , Neumann A. , Panicz R. , Keszka S.

nr 3