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International Journal of Occupational Safety and Ergonomics
2012 Vol. 18, No. 4 549--561
EN The aim of this study was to examine the effect of resonant breathing biofeedback training for reducing stress among manufacturing operators. Resonant breathing biofeedback works by teaching people to recognize their involuntary heart rate variability and to control patterns of this physiological re[...]
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Opuscula Mathematica
EN Matrix representations of bounded Hilbert space operators are considered. The matrices in question are defined with respect to frames, rather than bases. The frames, a generalisation of bases, used extensively in applied harmonic analysis, are overcomplete sequences. We consider some properties rela[...]
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Opuscula Mathematica
EN Matrices of operators with respect to frames are sometimes more natural and easier to compute than the ones related to bases. The present work investigates such operators on the Segal-Bargmann space, known also as the Fock space. We consider in particular some properties of matrices related to Toepl[...]
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Bulletin of the Polish Academy of Sciences. Technical Sciences
2019 Vol. 67, nr 5 963--968
EN The article presents an example of the use of functional series for the analysis of nonlinear systems for discrete time signals. The homogeneous operator is defined and it is decomposed into three component operators: the multiplying operator, the convolution operator and the alignment operator. An [...]
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Demonstratio Mathematica
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Demonstratio Mathematica
EN Operators preserving singularity and nonsingularity of matrices were studied in paper of P. Botta under the assumption that operators are linear. In the present paper the linearity of operators is not assumed: we only assume that operators are of the form T = (fi,j), wherei,j : K -> K and K is a fie[...]
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Demonstratio Mathematica
EN The purpose of this paper is to present some theorems on existence and uniqueness of solution for nonautonomous second order Cauchy problem with a dumping operator and with dependent on t not densely defined operators.
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Demonstratio Mathematica
EN In the year 1993, Gupta and Srivastava [3] introduced the integral modication of the well known Basakov operators by taking the weight functions of Szasz basis function, so called Baskakov-Szasz operators. To prove our one of the direct theorems, we use the technique of a mathematical tool which is [...]
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Demonstratio Mathematica
EN The paper is concerned with functional shifts and functional R-shifts for a right invertible operator D (cf. [30], [15]). Conditions for different kinds of invertibility of these functional shifts on a set of all D-monomials are established.
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Demonstratio Mathematica
EN By using the theory of extrapolation space X-1 associated with an operator A which is non densely defined in Banach space X, the existence and uniqueness of solutions of linear second order differential initial value problem (1) is proved.
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Demonstratio Mathematica
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Demonstratio Mathematica
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Measurement Automation Monitoring
2016 Vol. 62, No. 4 125--128
EN In the circuits of electrical signals belonging to the L1-impulses space or periodic signals space, occurring there real distribution of electrical currents does not meet the principle of minimum energy losses [1, 2]. The solution to this problem is to introduce the control system as current-depende[...]
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Fundamenta Informaticae
EN In this paper, we initiate some new operators for Pythagorean fuzzy set and discuss their properties in detail. Then, a new score function of Pythagorean fuzzy number (PFN) is proposed for solving the failure problems when comparing two PFNs. Later, we present an algorithm for solving multi-criteria[...]
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Bulletin of the Polish Academy of Sciences. Technical Sciences
2017 Vol. 65, nr 3 369--373
EN This paper describes a new method of determining the reactive power factor. The reactive power factor herein is calculated on the basis of time samples and not] with the Fourier transform of signals, like it was done previously. The new reactive power factor calculation results from the receiver adm[...]
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Mechanika / Akademia Górniczo-Hutnicza im. St. Staszica
2004 T. 23, z. 2 281-287
PL W Institut National de Recherche et de Securite (INRS) prowadzono badania oceny dziennego narażenia na hałas operatorów call centres (telefonicznych centrów obsługi klienta), którzy używają słuchawek nagłownych. Pomiary akustyczne przeprowadzono w 24 call centres, stosując aparaturę pomiarową sprzęż[...]
EN A study has been carried out by the Institut National de Recherche et de Securite (INRS) in order to estimate the daily noise exposure of the cali centre operators who are using headsets. Acoustic measurements were carried out through twenty four cali centres operating an instru-mentation matched to[...]
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Demonstratio Mathematica
EN We consider some operations on affine planes which resemble the construction of a derived affine plane at a point of the Benz plane. We call them Benz-contractions (B-contractions) , distinguishing between chain contractions and generator contractions. We prove that the Pappos-Pascal configuration i[...]
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Demonstratio Mathematica
EN We correct the mistake in the proof of Lemma 7 in our paper "Horizontal extension of connections into (2)-connections" published in Demonstratio Math. XXXVII (4) (2004).
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Demonstratio Mathematica
EN In the present paper, the norm of the bounded linear operator nabla acting on the sequence space Lp has been found and the fine spectrum with respect to Goldberg's classification of the difference operator nabla over the sequence space Lp has been determined, where 1 < p < oo.
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Demonstratio Mathematica
2005 Vol. 38, nr 4 923--934
EN In the paper a topological presentation of Petri nets has been presented. The presentation is based on a closure operation defined for an arbitrary transitive and dense binary relation. Such relations lead to a natural definition of Petri nets as a special bitopological spaces. In the paper some ele[...]
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