Technical Transactions. Vol. 6

Technical Transactions. Vol. 6

Type: Collection of magazine numbers
Release date

Collection items (21)


Software for calculations of the Higgs boson lineshape in future lepton colliders

Jadach, Stanisław, Kycia, Radosław A.
Article
2017
Simple software for Monte Carlo (MC) calculation of the Higgs boson lineshape and its beam broadening effect due to the beam energy dispersion is described. The software is based on the FOAM [1, 2] adaptive MC integrator from ROOT library [3]. This software enables the reproduction of the results presented in publication [4] and the tests with different parameters for the lineshapes and QED correction factors. A parallel version of the software based on MPI [5] is also described.

The use of waste heat from flue gas in the system of regeneration of steam boiler supply water

Zarzycki, Robert
Article
2017
This study presents an analysis of the process of the use of waste heat from flue gas for the purposes of heating water in the regeneration system of a steam power unit fuelled with brown coal with a power of 900 MWe. Preparation of flue gas and its initial moistening (increasing the dew point temperature) followed by cooling (condensation of the moisture contained in the flue gas) can ensure intensive heat exchange in the process of heat recovery. Replacing a first regeneration exchanger with the heat recovered from flue gas allows for an increase in steam power unit efficiency by 0.22% and limitation of CO2 emissions by 22,810 t/year, while reducing the fuel demand by 26,727 tonnes per annum. Depending on the prices of CO2 emissions permits and prices of brown coal, the proposed heat recovery allows for saving from €500,000 to €1,000,000 per year.

Determination of initial configuration of mechanism of an instrument for measuring the translation and rotation of a steered wheel

Wach, Krzysztof, Kupiec, Robert
Article
2017
This paper concerns the determination of the initial configuration of a mechanism of a prototypical instrument for measuring the translation and rotation of a steered wheel. It covers the determination of coordinates of characteristic points of the mechanism. They were measured using a ROMER measuring arm. In the paper the methodology of measurements is discussed, and in addition the results obtained are presented and their analysis conducted.

The performance of the rushton turbine eccentrically positioned in a mixing vessel. Part I: the qualitative CFD analysis

Wójtowicz, Ryszard, Lipin, Andrey A., Lipin, Aleksandr G.
Article
2017
A qualitative analysis of a liquid flow generated by a Rushton turbine eccentrically located in an unbaffled mixing vessel is presented in this paper. On the basis of CFD simulations the influence of the impeller position in the vessel on the flow pattern, velocity distributions and turbulence parameters are examined. Data are presented in visualisations and distribution maps created with various flow visualisation criterions. The results of this work can be used for the design and optimisation of mixing equipment applied in the industry.

Microstructure and properties of sintered metal matrix composites reinforced with SiC particles

Szewczyk-Nykiel, Aneta
Article
2017
Based on the prealloyed and diffusion bonded powders (Distaloy SA and Distaloy SE) different metal matrix composites reinforced with SiC particles were produced by the conventional powder metallurgy technology and the effect of varied amounts of SiC particles on microstructure evaluation and selected properties were investigated. It was stated that the mass fraction of SiC has a great effect on the density, porosity, shrinkage, hardness and wear resistance of studied composites. In the case of both Distaloy SA and Distaloy SE matrix materials, the optimum SiC content is 4 wt. % due to the highest wear resistance and hardness of sintered composite.

The idea of graphic profiles for supporting a choice of material and technological solution

Szafranko, Elżbieta
Article
2017
When constructing buildings and building structures, we must often solve dilemmas regarding the implementation of specific technologies and materials. Depending on the planned use of a building, its functions and the expectations of its future users, some solutions may be superior to others. Because of a high number of factors that weigh on the final decision, it is necessary to employ efficient decision-support tools. Having analysed such a cases, the author has developed her own approach based on a graphic template of an investment project, which is compared to the profiles of assessed variants. The article presents the approach using an example of constructing a production floor building, where the ambient conditions will be harsh due to the planned production profile. The analysis included construction variants with a roof supported by one of the three types of girders: wooden, steel and prestressed concrete ones.

Application of unmanned aerial vehicles for revising dispersion of time of key undertakings

Skorupka, Dariusz, Walczyński, Maciej, Siczek, Rafał, Kowacka, Magdalena
Article
2017
The paper summarizes the concept of using unmanned aerial systems for construction work monitoring. Mobile drones can be used for determining the current stage of a given subtask in a complex construction project. Such control allows more adequate determination of the completion time of a given task, leading to more effective project schedule management.

The algorithm for the evaluation of construction workers’ labour productivity

Plebankiewicz, Edyta, Malara, Jarosław
Article
2017
The paper presents an algorithm that allows to calculate the potential productivity of construction workers, including the factors that influence them. Its development involves one of the classifications of factors. In the next step, the elements of fuzzy logic were used for the parameterization of factors. Subsequently, a survey was applied to specify the gradation of individual factors with regard to their impact on productivity. The paper as a whole presents a mathematical algorithm, the practical application of which was presented too.

Prediction of changes in the performance characteristics of a building

Nowogońska, Beata
Article
2017
Over the course of their use, building structures are subject to constant destructive processes, which can take various courses. Over time, performance characteristics deteriorate, and can be partially restored as a result of repair works. The article presents a proposal for the prediction of changes in the performance characteristics of a building based on the adaptation of principles applied in predicting the operational reliability of technical objects.

Potential reasons for works delays resulting from the provisions of the agreement

Leśniak, Agnieszka, Piskorz, Grzegorz
Article
2017
The course of the construction process in time is shaped by a variety of factors, which, in effect, may become the reason for delays in project completion. The paper presents the outcome of research performed with Polish building works contractors. One of the aims was to try to identify the potential reasons for delays in construction works, which result from the provisions of the agreement. Early recognition and an assessment of possible risks may assist the contractor’s attempts to eliminate them or to lessen the scale of delays in the project implementation.