http://www.eje.cz unfavourable cold weather and scarcity of food during winter, ladybirds enter a period of dormancy and select suitable overwintering habitats (Majerus, 1994). There is considerable variation in the type of dormancy sites chosen by particular ladybird species (Majerus, 2016). Ladybirds spend winter in rock crevices, heaps of stones, leaf litter, tree bases, cones, grass tussocks, standing dry herbs,
Mankind has passed over a significant historical frontier, namely the expansion of technological processes where hazardous substances are potential threats for employees, the public, the environment and property and, therefore, it is there is an inevitable need to pay increased attention to the occurrence of industrial accidents and, mainly, their prevention. The area of safety of technical and technological systems is very closely connected, not only with the reliability of the processes but it has also wider linkages with regard to the technical, social, legal and other aspects. There exist several systematic approaches, methods and techniques to assess industrial processes and risks linked to these processes on the European Union level and also on the national level of each member state. We can mention some basic systematic approaches -MOSAR, CPQRA, ARAMIS, PRA (PSA) widely used in this area. However, according to analyst's needs, they usually miss the structured and systematic approach of how to complete the risk assessment in steps and what the content of each of these steps is. The main focus of this paper is to discuss the theoretical aspects of risk assessment in industrial processes and to show the possible approach of a structured and systematic method with support of logical diagrams to fulfil all tasks concerning the industrial accident assessment. Last but not least we present the research activities
The paper deals with the selected characteristics, such as moisture, average bulk density, and fraction size, of tropical marblewood dust (Marmaroxylon racemosum) that influence its ignition risk. Research was focused on sieve analysis, granulometric analysis, measurement of moisture level in the dust, and determination of the minimum ignition temperatures of airborne tropical dust and dust layers. Samples were prepared using a Makita 9556CR 1400W grinder and K36 sandpaper for the purpose of selecting the percentages of the various fractions (<63, 63, 71, 100, 200, 315, 500 μm). The samples were sized on an automatic vibratory sieve machine Retsch AS 200. More than 65% of the particles were determined to be under 100 μm. The focus was on microfractions of tropical wood dust (particles with a diameter of ≤100 µm) and on the impact assessment of particle size (particle size <100 µm) on the minimum ignition temperatures of airborne tropical dust and dust layers. The minimum ignition temperature of airborne marblewood dust decreased with the particle size to the level of 400 °C (particle size 63 μm).
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