In this paper, a new simple method for determination of flow parameters, axial dispersion coefficients DL and Péclet numbers Pe was presented. This method is based on an accurate measurement model considering pulse tracer response. Our method makes it possible to test the character of gas flow motion and precisely measure flow parameters for different pressures and temperatures. The idea of combining the transfer function, numerical inversion of the Laplace transform and optimisation method gives many benefits like a simple and effective way of finding solution of inverse problem and model coefficients. The calculated values of flow parameters (DL and/or Pe) suggest that in the considered case the gas flow is neither plug flow nor perfect mixing under operation condition. The obtained outcomes agree with the gas flow theory. Calculations were performed using the CAS program type, Maple®.
This paper concerns the issues of measurement techniques, analysis and assessment of the machined surface geometric structure. The aim of this work was to show the application of surface analysis in diagnosing the causes of discrepancies occurring in the manufacturing process, which may result from ill-matched (poorly fitting) process parameters. An appropriate system of control and interpretation of results may allow early reaction to unfavorable trends (for example blunting of the tool) and prevention of undesirable defects. The subject of research was a waste basket used in the construction of retaining sewer systems. In this paper, the quality of the waste basket as well as its manufacturing process were analyzed and assessed. The research was carried out with the use of three measurement stands, i.e. optical microscopy (OM), scanning electron microscopy (SEM) and white light interferometer (WLI). The surface analysis proved to be important from the viewpoint of outlining the production process as well as improving the product quality. The software used for topographical analysis appeared to be significant for the success of the analysis, providing notable economic effects, namely the lack of defects.
Semi-structured individual in-depth interviews were conducted to explore and compare which social norms with regard to the debt-incurring process are important to Poles with various experiences of indebtedness. Thematic analysis within a constructionist framework identified the social norms important in the borrowing process for Poles and revealed, as expected, a number of differences between people with various indebtedness experiences. Model borrowers have a significantly different approach to debt than unreliable debtors and non-borrowers. Model borrowers seem to be oblivious to the negative sides of loans as well as indicate fewer reasons for justifying not repaying obligations than others. For unreliable debtors, loans are a quick way to solve financial problems. They borrow money out of necessity rather than to finance any larger, long-term investments and have their own private rules for borrowing. Non-borrowers, although aware of borrowers’ higher standard of living, emphasize that debt is associated with permanent stress and psychological burden. Model borrowers, unlike the others, declare that in their immediate vicinity are only those who use and pay their loans in a timely manner.