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Influence of Ceramic Coatings on the Mechanical Properties of Ceramic Moulds Used in the Replicast CS Technology

100%

Buczkowska K. , Pacyniak T.

tom Vol. 15, iss. 3 spec.

112--118

The paper discusses the issues related to the Replicast CS technology. The research concerning the indication of the bending strength of ceramic moulds depending on the type and configuration of the shells will determine the effect of the type of binder and powder on the mechanical properties of shell moulds. The experimental studies presented in the paper include the manufacture of polystyrene models, followed by the application of 6 layers of ceramic coatings of different types and configurations on sets of polystyrene and wax models. Next, the studies test the bending strength of the obtained samples of ceramic moulds, depending on the type and configuration of the coatings. The presented research has shown the relationship between the different configurations of the materials used for the manufacture of ceramic coatings and their bending strength. It has been shown that, by the appropriate selection of the ceramic coatings, it is possible to obtain ceramic moulds with a possibly high bending strength.

Genetic differentiation among geographically close populations of Malva alcea

80%

Celka Z. , Buczkowska K. , Baczkiewicz A. , Drapikowska M.

nr 2

Influence of time and pressure of forming a pattern on mechanical properties

80%

Pacyniak T. , Buczkowska K. , Kaczorowski R.

tom Vol. 11, iss. 3 spec.

151--156

In this paper, the technology of forming patterns on a research station equipped with an autoclave A-600 of Polish company GROM is presented. This study was conducted to determine the influence of pressure and time of forming a pattern on the bending strength. Analysis of the results confirmed that bending strength increases with increasing the pressure. The time of forming a pattern has a similar effect.

Isozyme and DNA markers reveal a new genetically distinct taxon of Calypogeia saphagnicola (Jungermanniopsiada, Calypogeiaceae)

71%

Buczkowska K. , Sawicki J. , Szczecinska M. , Klama H. , Baczkiewicz A.

nr 1

Morfologiczne i anatomiczne zróżnicowanie populacji kosodrzewiny (Pinus mugo Turra) z polskich Tatr wyrażone w cechach igieł

61%

Pawlaczyk E. M. , Baczkiewicz A. , Wawrzyniak P. , Czlopinska M. , Gonera P. , Buczkowska K.

nr 1

The main aim of this study was to describe the variation between the populations of the dwarf mountain pine Pinus mugo Turra based on the morphological and anatomical traits of their needles, and to investigate the relationship between the observed variation and environmental conditions (altitude and substrate).Two-year-old needles were collected from 180 individuals of six populations of P. mugo growing in the Tatra Mts. Two populations were classified as dense, located at 1360–1450 m altitude, and the remaining four formed loose clusters and were situated at 1500–1650 m altitude. Four of the populations are growing on granite and two on a limestone substrate. The natural variation of 10 morpho-anatomical and 3 synthetic needle traits was measured. In addition to descriptive statistics, the analyses of variance (ANOVA) with a Tukey test and principal component analysis were computed. We also estimated Pearson correlation coefficients for the examined needle traits and altitude as well as substrate. Our results indicate that the P. mugo populations differ significantly with regard to the investigated traits for which the Trzydniowiański Wierch population was the most distinct. The observed pattern of variability is largely caused by differences in stomatal traits and these features are positive correlated with altitude. Additionally, populations growing on granite have larger values for most of the examined traits compared to populations growing on limestone.