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Selected physical attributes of common beech nuts harvested from four tree stands in northern Poland were determined. Seeds were manually extracted from every nut. Seeds and nuts were weighed, and the results were used to determine the ratio of seed weight to nut weight, which described the degree of nut filling. Physical parameters and the calculated coefficients were compared by the t-test for independent...
In the paper a fragment of research on development of modelling methods of asymmetrical multi-bolted flange connections is presented. The effect of the bolt modelling method in a single bolted joint on both the stiffness characteristics of elements joined in the multi-bolted flange connection and bold forces have been examined. An analysis of the multi-bolted flange connection is carried out for selected...
Technologies of digital photogrammetry provide the metric and thematic information for various data bases, including those which are created to visualize and archive the cultural heritage objects. Due to different sizes, shapes, locations and environmental conditions of objects, data is acquired by means of various photogrammetric methods based on aerial and terrestrial digital imagery and laser scanning...
Resonant transverse bending vibrations of the band saw blade have been investigated taking into consideration variable in the time tension force of the blade and the external periodic perturbation. Amplitude of resonant vibrations of the band saw blade piece has been determined by the Bubnov-Galerkin method and basing on the idea of perturbation theory.
This work contains information concerning long-wave atmospheric radiation. Artificial neural networks were developed to forecast total mean hourly irradiance based on long-wave atmospheric radiation as cloudiness indicator. It was proved that using this variable in models for forecasting irradiance is wellgrounded. The proof was based on the neural networks sensitivity analysis. It was proved that...
System of marketing of construction products in Poland is a complex system that allows to control the initial facilitation of construction materials process on the market. The system is complex from the structural and internal relations points of view what still cause numerous issues among building material producers. The manufacturers’ position has been much more complicated by the Regulation (EU)...
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