Krízový manažment - Ročník 22.; Číslo 1/2023

Permanent URI for this collectionhttps://drepo.uniza.sk/handle/hdluniza/837

Browse

Author: search.filters.author.Marková, IvetaHas files: Yes

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    Item
    Analýza rizika iniciácie usadenej vrstvy prachu smreka vybranými iniciačnými zdrojmi
    (Žilinská univerzita v Žiline, 2023) Tureková, Ivana; Marková, Iveta
    The article evaluates the minimal initiation temperature and hot surface temperature of the spruce dust layer using selected ignition sources. The influence of selected physical properties of wood dust, the size of the contact area between the ignition source and the combustible material, the ignition time, and the thermally degraded area are monitored. The article describes the behaviour of a 15 mm beech dust layer (Beech Fagus silvatica L.) under the action of three potential initiating sources: a hot surface, an electric spiral, and a smouldering cigarette. Prior to the experimental determination of the minimum ignition temperature, the dust moisture was determined and the sieve analysis was performed. The lowest minimum ignition temperature on the hot plate was 280 °C. The ignition mechanism of wood dust was comparable for all initiators investigated, differing in the ignition time and the area of the thermally degraded layer. The least effective was the initiating source of the smouldering cigarette.
  • Thumbnail Image
    Item
    Sledovanie vplyvu tepelného toku a hrúbky drevených dosiek na čas zapálenie
    (Žilinská univerzita v Žiline, 2023) Marková, Iveta; Tureková, Ivana; Ivaničová, Martina; Jaďuďová, Jana
    Oriented strand boards (OSB) and particleboards (PB) are wooden boards, commonly used in building structures or building interiors. The surface of boards may hence become directly exposed to fire or radiant heat. The aim of this paper is to evaluate the behaviour of uncoated particleboards and OSB exposed to radiant heat. The following ignition parameters: heat flux intensity (from 43 to 50 kW.m-2) and ignition temperature were used to observe the process of particleboard and OSB ignition. The time-to-ignition of particleboards and OSB with a thickness of 12, 15, and 18 mm were monitored and compared. The experiments were conducted on a modified device in accordance with ISO 5657:1997. Results confirmed the thermal degradation of samples. Heat flux had a significant effect on time-to-ignition. OSB had a higher ignition time than particleboards and the thermal degradation of OSB started later, i.e., at a higher temperature than that of particleboards, but OSB also had a higher mass loss than particleboards. The samples yielded the same results above 47 kW.m-2 .
  • Thumbnail Image
    Item
    Správa o konferenciách na KPI
    (Žilinská univerzita v Žiline, 2023) Marková, Iveta; Svetlík, Jozef
    The paper presents a report on conferences (ADVANCES IN FIRE & SAFETY ENGINEERING, FIRE PROTECTION & RESCUE SERVICES), which were aimed at presenting the latest knowledge in the field of fire and safety engineering. The focus of the conferences was also the solution of current issues in the field of higher education and professional training of future experts in the field of rescue services.