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Abstract

As a preliminary point, four longwalls, where inertisation of goafs using nitrogen was applied, have been characterised. Next, the issue concerning the unreliable Graham’s ratio values, which occur in certain ranges of its denominator value, were discussed. The reliability criterion of this indicator was also quoted. Afterwards, a basic statistical sample consisting of the results of chromatographic analyses of air samples taken from longwalls areas, where nitrogen inertisation was not applied and were classified by Graham’s ratio as samples safe from endogenous fire hazard was described. Then, the results of comparative analyses of the base sample with the concentrations of gases contained in air samples taken from the areas of the previously described four longwalls, which according to Graham’s ratio, were also safe from the endogenous fire were presented. Comparative analyses were performed before and after applying Graham’s ratio reliability criterion.
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Bibliography

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[16] S . Trenczek, Ocena stanu zagrożenia pożarem endogenicznym, na podstawie temperatury zrobów wyznaczonej metodą gazów istotnych. Zeszyty Naukowe Politechniki Śląskiej, seria Górnictwo 258, 363-375 (2003).
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Authors and Affiliations

Lucjan Świerczek
1
ORCID: ORCID

  1. Central Mining Institute, Department of Mining Aerology, 1 Gwarków Sq., 40-166 Katowice, Poland
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Abstract

Being negatively impressed by the data published by the European Commission in CARE (Community database on Accidents on the Roads in Europe), where Poland is presented as the European Country with the highest rate of fatalities in road crashes involving cyclists during 4 years period (2009–2013), the Authors decided to analyse available data. Bikes become a more and more popular means of transport and the way of active recreation. In Warsaw, the share of bicycle trips rises 1 to 3% per year. The aforementioned, together with increasing traffic density, caused 4233 registered injuries among cyclists in 2018 in Poland. In 286 cases the accidents were direct reasons for the cyclists’ death. Considering these facts, it becomes extremely important to point the most influencing factors and conditions contributing to cyclists’ serious accidents. Onedimensional or two-dimensional statistics are not sufficient to find all important associations between the road conditions and the number of cyclists’ accidents. To overcome that the association analysis is applied. The results of the analysis can contribute to increasing the knowledge and safety of transport.
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Bibliography


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Authors and Affiliations

Hubert Anysz
1
ORCID: ORCID
Paweł Włodarek
1
ORCID: ORCID
Piotr Olszewski
1
ORCID: ORCID
Salvatore Cafiso
2
ORCID: ORCID

  1. Warsaw University of Technology, Faculty of Civil Engineering, Al. Armii Ludowej 16, 00-637 Warsaw, Poland
  2. University of Catania, Department of Civil Engineering and Architecture, Viale Andrea Doria 6, 95131 Catania, Italy

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