Wyniki wyszukiwania - BazTech

1

Over 10 000 δ Scuti Stars toward the Galactic Bulge from OGLE-IV

Pietrukowicz P., Soszyński I., Netzel H., Wrona M., Udalski A., Szymański M. K., Poleski R., Kozłowski S., Skowron J., Ulaczyk K., Skowron D. M., Mróz P., Rybicki P., Iwanek P., Gromadzki M.

Acta Astronomica

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2020

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Vol. 70, No. 4

241--263

EN

We present a collection of 10 111 genuine δ Sct-type pulsating variable stars detected in the OGLE-IV Galactic bulge fields. In this sample, 9835 variables are new discoveries. For most of the stars photometric data cover the whole decade 2010-2019. We illustrate a huge variety of light curve shapes of δ Sct variables. Long-term observations have allowed us to spot objects with evident period, amplitude, and mean brightness variations. Our analysis indicates that about 28% of the stars are single-mode pulsators. Fourteen δ Sct stars show additional eclipsing or ellipsoidal binary modulation. We report significant attenuation or even disappearance of the pulsation signal in six sources. The whole set of variables is a mix of objects representing various Milky Way's populations, with the majority of stars from the Galactic bulge. There are also representatives of the Sagittarius Dwarf Spheroidal Galaxy. Some of the newly detected variables could be SX Phe-type stars residing in globular clusters. The collection, including full V- and I-band time-series data, is available to the astronomical community from the OGLE On-line Data Archive.

2

Bezpieczeństwo ruchu drogowego - analiza danych z wyroków sądów krajowych wobec kierujących pod wpływem alkoholu

Pilarowski L., Rybicki P.

Transport Samochodowy

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2011

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z. 4

67--83

PL

W artykule przedstawiono wyniki analizy statystycznej informacji zawartych w orzeczonych przez krajowe sądy wyrokach dla osób prowadzących pojazdy pod wpływem alkoholu. Do analizy zastosowano różnego typu kryteria takie, jak struktura płci i wieku sprawcy, zawartość alkoholu w wydychanym powietrzu, rodzaj pojazdu, wahania liczby nietrzeźwych kierowców w wybranych okresach, jak również rodzaj i wymiar stosowanych przez sądy kar (zakres korzystania z dostępnych możliwości prawnych) oraz czas trwania postępowania procesowego, zwłaszcza w przypadkach winy oczywistej, co nie wymaga przeprowadzenia skomplikowanych czynności dowodowych.

EN

This article is devoted to statistical data analysis conducted with reference to previously generated database (all information required for that purpose was provided by judicial decisions concerning drunk drivers). Various criteria, such as age and gender structure, BrAC coefficient, vehicle type, fluctuations in the number of drunk drivers in selected periods of time as well as type and length of judgements delivered by polish courts or even duration of legal proceedings (especially those related to cases where guilt is certain and doesn't require long procedures) were applied to the database in order to maximize the accuracy of carried out analysis.

3

Corrosion resistance of SAW duplex joints welded with high heat input

Nowacki J., Rybicki P.

Journal of Achievements in Materials and Manufacturing Engineering

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2007

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Vol. 23, nr 2

7-14

EN

Purpose: test if the welding heat input exceeding the recommended values has negative impact on strength properties and corrosion resistance of the executed welded joints as well as description of influence of the heat input of submerged arc welding (SAW) of duplex steel UNS S31803 (0.032%C, 23.17%Cr, 9.29%Ni, 3.48%Mo, 0.95%Mn, 0.7%Si, 0.16%N, 0.017P, 0.006%S, 0.11%Cu) on welded joints microstructure, particularly average values of ferrite volume fraction, mechanical properties, and corrosion resistance. Design/methodology/approach: analysis of welding heat input influence on mechanical properties, value of ferrite share, and corrosion of test joints has been done. Non-destructive and destructive testing, e. g. visual examinations, microstructure examination, corrosion resistance tests according to ASTM G48 Method A, HV5 hardness tests, impact and tensile test were carried out. For analysis of welding heat input influence on creation of welding imperfections, there were executed welding of sheet of thickness 9, 14, 28 mm. Butt joints on plates of different thickness were made where the applied heat input of welding exceeded the 2.5 kJ/mm value. Maximum heat input level was HI lto 3.0; HI lto 3.5; HI lto 4.0; HI lto 4.5; HI lto 5.0. Findings: based on the performed tests the conclusion is that according to DNV Rules the welding heat input exceeding the recommended values has no negative impact on strength properties and corrosion resistance of the executed welded joints. It was shown that submerged arc welding of duplex steel with the heat input from 2.5 kJ/mm up to 5.0 kJ/mm has no negative influence on properties of the joints. Research limitations/implications: the welding heat input exceeding the recommended values may influenced the precipitation processes in the HAZ, what need further experiments. Practical implications: application of high value of the welding heat input will be profitable in terms of the welding costs. Originality/value: an original value of the paper is to prove that a usage of high value welding heat input provides the best joints quality.

4

Wpływ energii liniowej spawania stali UNS S31803 metodą SAW na odporność korozyjną złączy

Nowacki J., Rybicki P.

Przegląd Spawalnictwa

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2006

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R. 78, nr 9-10

9-11

PL

Przeprowadzono badania mające na celu określenie wpływu energii liniowej spawania blach ze stali duplex UNS S31803 łukiem krytym pod topnikiem na odporność korozyjną złączy. Wykonano serię połączeń doczołowych ze spoinami czołowymi blach o grubości 30 mm z energią liniową spawania przekraczającą wartość 3,0 kJ/mm co 0,5 kJ/mm do wartości 5 kJ/mm w pozycji podolnej. Złącza poddano badaniom nieniszczącym i niszczącym, w tym badaniu mikrostruktury i procentowej zawartości ferrytu oraz odporności korozyjnej. W celu określenia wpływu spawania wielowarstwowego / ściegowego na zawartość ferrytu i odporność korozyjną wykonano złącza teowe ze spoinami czołowymi o różnej grubości blachy ukosowanej 9,14, 28 mm z zastosowaniem stałej wartości energii liniowej spawania na poziomie 1,35 kJ/mm, w których warstwy wypełniające, jak również licowe wykonano łukiem krytym pod topnikiem w pozycji nabocznej. Wszystkie spoiny połączeń teowych poddano badaniom odporności korozyjnej, jak również przeprowadzono analizę mikrostruktury oraz określono procentową zawartość ferrytu. Do testów wykorzystano blachy duplex UNS S31803. Na podstawie przeprowadzonych badań wynika, iż w świetle wymagań przepisów DNV energia liniowa w zakresie 3-5 kJ/mm, tzn. przekraczająca zalecane wartości, nie wpływa negatywnie na właściwości wytrzymałościowe oraz na odporność korozyjną wykonanych połączeń.

EN

Purpose of this paper is description of influence of the heat input of submerged arc welding (SAW) of duplex steel UNS S31803 on welded butt joints corrosion resistance. Methodology: butt joints on plates of 9 - 30 mm thickness were executed where the applied heat input of welding exceeded the 2.5 kJ/mm value. Maximum heat input level was HI <3.0; HI <3.5; HI <4.0; HI <4.5; HI <5.0. Analysis of welding heat input influence on mechanical properties, value of ferrite share, and corrosion of test joints has been done. Non-destructive and destructive testing, e. g. visual examinations, microstructure examination, corrosion resistance tests according to ASTM G48 Method A, HV5 hardness tests, impact and tensile test were carried out. For analysis of welding heat input influence on creation of welding imperfections, there were executed welding of sheet of thickness 9, 14, 28 mm. Findings: it was shown that submerged arc welding of duplex steel with the heat input from 2.5 kJ/mm up to 5.0 kJ/mm has no negative influence on properties of the joints. Based on the performed tests the conclusion is that according to DNV Rules the welding heat input exceeding the recommended values has no negative impact on strength properties and corrosion resistance of the executed welded joints. Research implications the welding heat input exceeding the recommended values should influenced the precipitation processes in the HAZ, what need further experiments. Practical implications: application of high value of the welding heat input will be profitable in terms of the welding costs. Originality: an original value of the paper is to prove that a usage of high value welding heat input provides the best joints quality.

5

Influence of heat input on corrosion resistance of SAW welded duplex joints

Nowacki J., Rybicki P.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

113--116

EN

Purpose: Purpose of this paper is description of influence of the heat input of submerged arc welding (SAW) of duplex steel UNS S31803 on welded butt joints corrosion resistance. Design/methodology/approach: Butt joints on plates of 9-30 mm thickness were executed where the applied heat input of welding exceeded the 2.5 kJ/mm value. Maximum heat input level was HI ≤ 3.0; HI ≤ 3.5; HI ≤ 4.0; HI ≤ 4.5; HI ≤ 5.0. Analysis of welding heat input influence on mechanical properties, value of ferrite share, and corrosion of test joints has been done. Non-destructive and destructive testing, e. g. visual examinations, microstructure examination, corrosion resistance tests according to ASTM G48 Method A, HV5 hardness tests, impact and tensile test were carried out. For analysis of welding heat input influence on creation of welding imperfections, there were executed welding of sheet of thickness 9, 14, 28 mm. Findings: It was shown that submerged arc welding of duplex steel with the heat input from 2.5 kJ/mm up to 5.0 kJ/mm has no negative influence on properties of the joints. Based on the performed tests the conclusion is that according to DNV Rules the welding heat input exceeding the recommended values has no negative impact on strength properties and corrosion resistance of the executed welded joints. Research limitations/implications: Research implications the welding heat input exceeding the recommended values should influenced the precipitation processes in the HAZ, what need further experiments. Practical implications: Application of high value of the welding heat input will be profitable in terms of the welding costs. Originality/value: An original value of the paper is to prove that a usage of high value welding heat input provides the best joints quality.

6

Wpływ gazu osłonowego na geometrię napoin wykonanych metodą FCAW na stali duplex UNS S31803

Nowacki J., Rybicki P.

Przegląd Spawalnictwa

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2005

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R. 77, nr 2-3

7-9