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Abstract

The article presents the results of research concerning the effect of anthracite dust with 10%, 20%, 30%, 40% and 50% content in composites with a polypropylene matrix on selected properties. Hardness was examined with the Shore’s D method; stiffness, tensile strength as well as (MFR) Melt Flow Rate and (MVR) Melt Volume Rate of the investigated material were evaluated; wettability of the obtained material was also determined. Surface and volume resistivity were also investigated; the thermal properties of the filler were determined by thermogravimetric analysis (TGA). It was found that the investigated polypropylene composites filled with anthracite dust are hydrophobic materials and the composite hardness and stiffness are growing along with the volumetric increase of anthracite. It was noted that anthracite reinforces the material to a limited extent.

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Authors and Affiliations

M. Polok-Rubiniec
A. Włodarczyk-Fligier
B. Chmielnicki
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Abstract

The paper discusses the first find of a bullet core from the territory of Bulgaria. This core fills in a gap in the occurrence of this technology in between the Marmara Sea basin and the northwestern part of the Pontic region. Because the core from the vicinity of Varna is a surface find it is difficult to determine its chronological position.

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Authors and Affiliations

Ivan Gatsov
Petranka Nedelcheva
Małgorzata Kaczanowska
Janusz K. Kozłowski

Abstract

AbstractThe stability of fractional standard and positive continuous-time linear systems with state matrices in integer and rational powers is addressed. It is shown that the fractional systems are asymptotically stable if and only if the eigenvalues of the state matrices satisfy some conditions imposed on the phases of the eigenvalues. The fractional standard systems are unstable if the state matrices have at least one positive eigenvalue.
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