Evaluation of the influence of storage conditions of dispersed fillers on the properties of composites based on them

The results of a study of the effect of storage conditions of dispersed fillers widely used in the repair of machines (mica, boron nitride, aluminum powder, carbon-containing powder) on the properties of composites based on them are presented. The results of the microstructure of the samples after exposure of the fillers under standard storage conditions, as well as high air humidity and a temperature drop, are presented

Efficacy increase of silvicultural measures with biological methods in the pine stands

Based on the analysis of database of the pine stands of Belarus affected by annosum root rot, and the results of longstanding research the substantiati on of silvicultural criteria for designation of stump treatment with biological preparations in the pine fore sts to limit the severity of the pathogen is given. It is proposed to differ site selection for stump treatment according to the regional-typological principle because of significant differences in the relative infestation of pine stands in different forest conditions. It was found that that the treatment should be carried out in pine stands of mossy and bracken series of forest types I–III age classes, and in the pine forest s of Gomel and Mogilev region also in age class IV, as well as heather, lichen and cranberry series of fore st types. In this case, the use of biological agents on the basis of the fungus Phlebiopsis gigantea is useful when conducting selective and complete sanitary felling (regardless of intensity), as well as thi nning and cleaning litter (with a sample of at least 20% of a physiologically live pine wood is cut down from the stock) at steady daily average tempera-tures of at least +5°C

Ranking of silvicultural areas by the threat of annosum root rot in pine stands

The paper presents a ranking of forest sites according to the threat ofinfection of planting Pinus sylvestrisstands by Heterobasidion annosum.8 degrees of treat of infection are marked out according to the site characteristics and types of habitat and moisture conditions. Presented gradation underlined planning of forest stands with susceptible species, that would allow to make for creation of more stable stands, reduction of infection and decrease costs of protection measures