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Szczecin, Poland

West Pomeranian University of Technology, Szczecin is a technical university in Szczecin, Poland. Wikipedia.

Mozia S.,West Pomeranian University of Technology
Separation and Purification Technology | Year: 2010

The paper presents an overview of the hybrid photocatalysis-membrane processes and their possible applications in water and wastewater treatment. Different configurations of photocatalytic membrane reactors (PMRs) are described and characterized. They include PMRs with photocatalyst immobilized on/in the membrane and reactors with catalyst in suspension. Advantages and disadvantages of the hybrid photocatalysis-membrane processes in terms of permeate flux, membrane fouling and permeate quality are discussed. Moreover, a short introduction to the heterogeneous photocatalysis and membrane processes as unit operations is given. © 2010 Elsevier B.V. All rights reserved. Source

Borsukiewicz-Gozdur A.,West Pomeranian University of Technology
Applied Thermal Engineering | Year: 2013

Results of experimental investigations of the ORC power plant operating with R227ea as the cycle working fluid are presented. The ORC power plant was fuelled with hot water of the temperature ranging from 66 °C up to 111 °C, at the maximum volume flow of 106 L/min. The ORC research installation was provided with a hermetic turbogenerator of special design to run at 3000 rpm in the nominal operating point. Detailed scheme of the research installation together with the measurement points locations are presented in the paper. The experimental results are supported by relevant calculation results that include an analysis and discussion of the quantities affecting the ORC power plant operation. © 2013 Elsevier Ltd. All rights reserved. Source

Borsukiewicz-Gozdur A.,West Pomeranian University of Technology
Applied Thermal Engineering | Year: 2013

Calculation results for the pumping work in the ORC systems are presented. Analysis has been carried out for 18 different organic fluids that can be used as working media in the subcritical ORC power plants. An attempt was made to find correlations between various thermo-physical properties of working fluids, specific work and power of the cycle. The simulation results allow a statement that the working substances with relatively low critical temperature have a greater cycle pressure range for the specified cycle temperature range than those with higher critical temperatures. The greater cycle pressure range contributes to a higher pumping power demand. Due to the fact that the specific pumping work does not result in explicit statement on the suitability of some working fluid to a specified ORC power plant, a definition of the power decrease factor κ is introduced. © 2012 Elsevier Ltd. All rights reserved. Source

Mazurek P.,West Pomeranian University of Technology
Soft Computing | Year: 2013

Track-before-detect (TBD) algorithms are used for tracking systems, where the object's signal is below the noise floor (low-SNR objects). A lot of computations and memory transfers for real-time signal processing are necessary. GPGPU in parallel processing devices for TBD algorithms is well suited. Finding optimal or suboptimal code, due to lack of documentation for low-level programming of GPGPUs is not possible. High-level code optimization is necessary and the evolutionary approach, based on the single parent and single child is considered, that is local search approach. Brute force search technique is not feasible, because there are N! code variants, where N is the number of motion vectors components. The proposed evolutionary operator-LREI (local random extraction and insertion) allows source code reordering for the reduction of computation time due to better organization of memory transfer and the texture cache content. The starting point, based on the sorting and the minimal execution time metric is proposed. The unbiased random and biased sorting techniques are compared using experimental approach. Tests shows significant improvements of the computation speed, about 8 % over the conventional code for CUDA code. The time period of optimization for the sample code is about 1 h (1,000 iterations) for the considered recursive spatio-temporal TBD algorithm. © 2012 The Author(s). Source

Majda P.,West Pomeranian University of Technology
Precision Engineering | Year: 2012

This paper presents the problems of the geometric accuracy of machine tools. The analytical and experimental examinations were carried out for a table in which guideway geometric errors may result in significant deformations. The main aim was to propose a method of analytical examination of the influence of geometric errors in linear guideway on joint kinematic errors. The proposed method served to isolate and simulate geometric errors, one of the causes of volumetric errors in machine tools. This approach helped to understand and interpret the results of experimental examinations of angular kinematic errors (pitch, yaw, roll) obtained for a real machine tool. The results helped to verify the hypothesis that the deformation of a table may be a significant source of errors in volumetric error models. One of the final conclusions indicated that off-line compensation of some characteristics of angular kinematic errors in machine tools may be unjustified. © 2012 Elsevier Inc. All rights reserved. Source

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