The aim of the paper is to assess the values of shear (delaminating) stress in the composition plane between the concrete (RC) deck slab and wood girder from concrete shrinkage, and shrinkage and swelling of wood, as well as difference in temperature between the wood web and concrete slab.
Many analysis of growth poles do not refer directly to development and dynamics of propulsive activities, but rather to their effects. In this paper the author concluded that essential role may be played by fast-growing and knowledge-based small and medium enterprises (SMEs) while their intra-regional diversity of activity may be a reasonable proxy measure of a role played by specific town as a growth centre. Therefore the article has two main goals: methodical – determining the usefulness of the activity of fast-growing and (potentially) innovative small and medium enterprises as a designatum for the growth pole and cognitive – to capture the spatial differences in the distribution of this kind of SMEs in Podkarpackie region. The study showed strong diversification of the number of fast-growing and (potentially) innovative SMEs on the local level. All techniques of determining the level of economic development and it’s dynamics taken into consideration in the analysis testify to strong and rising position of Rzeszów as a regional growth pole. It indicates growing role of metropolisation processes in Poland even in case of peripheral, weakly urbanised region with a relatively small regional centre compared to the biggest Polish cities.
The analysis of effectiveness of the gradient algorithm for the two-dimension steady state heat transfer problems is being performed. The three gradient algorithms - the BCG (biconjugate gradient algorithm), the BICGSTAB (biconjugate gradient stabilized algorithm), and the CGS (conjugate gradient squared algorithm) are implemented in a computer code. Because the first type boundary conditions are imposed, it is possible to compare the results with the analytical solution. Computations are carried out for different numerical grid densities. Therefore it is possible to investigate how the grid density influences the efficiency of the gradient algorithms. The total computational time, residual drop and the iteration time for the gradient algorithms are additionally compared with the performance of the SOR (successive over-relaxation) method.
The work presents the results of experimental study on the possibilities of determining the source of an ultrasonic signal in two-dimensional space (distance, horizontal angle). During the research the team used a self-constructed linear array of MEMS microphones. Knowledge in the field of sonar systems was utilized to analyse and design a location system based on a microphone array. Using the above mentioned transducers and broadband ultrasound sources allows a quantitative comparison of estimation of the location of an ultrasonic wave source with the use of broadband modulated signals (modelled on bats' echolocation signals) to be performed. During the laboratory research the team used various signal processing algorithms, which made it possible to select an optimal processing strategy, where the sending signal is known.
The research paper presents the results of the dynamic analysis of an existing bar dome subjected to wind loads. The calculation model of the structure was constructed using the finite element method. The dome was subjected to the standard wind pressure, assuming that it is operates in a harmonic manner. The numerical analyses were performed with the application of Autodesk Robot and MES3D. The analysis focused on the impact of selected factors such as the frequency of forcing, wind gustiness coefficient and structural damping on the behaviour of structures.
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