Technical Transactions. Vol. 4

Technical Transactions. Vol. 4

Type: Collection of magazine numbers
Release date

Collection items (21)


Light sources and their influence on vision organ

Otowski, Wojciech, Lewińska, Gabriela
Article
2017
The aim of the study was to compare light sources. The paper presents the spectrum of light intensity for natural and artificial sources. Analysis of the spectra was carried out because of their importance for the health of the eye.

The pressure and the vibration measurement in automotive shock absorbers

Sikora, Marian
Article
2017
The purpose of this article was to develop a measurement system for analyzing the dynamic behavior of automotive hydraulic dampers as well as to examine the internal pressures in each hydraulic chamber of the damper. Dampers are one of the components of the vibration/noise system that originates at the contact point/surface between the wheel and the road, and then ends at the body of the vehicle. Specifically, dampers are often a source of flow-induced or motion-induced noise due to the operation of the valves. In this paper, measurement results are presented in the form of time histories of the internal pressures and piston rod acceleration, respectively. Fast Fourier Transform (FFT) graphs are also presented in order to identify the major components of the phenomena under investigation in a frequency domain.

Generation of homo- and heterogeneous microcapsules and their application

Semba, Damian, Trusek-Hołownia, Anna
Article
2017
Microencapsulation is defined as a process during which the whole envelopment with (bio)catalysts, substrates etc. is included into hydrogel and/or surrounded by a porous polymeric membrane. However, the production of homogeneous, narrow size, distributed capsules is quite troublesome. The main problem is the way of obtaining a large number of capsules with a precisely predefined size. It is possible due to a device called an encapsulator. This equipment allows to produce homogeneous beads and core-shell systems with a predefined size in the range from 400 μm to 1600 μm, which is possible because of special nozzles with different diameters. There are a lot of microcapsule applications. In this paper, we would like to present the construction, principles of operation and selected applications of microencapsulation devices using the example of the BÜCHI–B390 encapsulator.

Mathematical modeling of heat and mass transfer of particles encapsulation in a fluidised bed

Lipin, Aleksandr G., Lipin, Andrey A., Wójtowicz, Ryszard
Article
2017
The mathematical model, which allows to predict changes of the coverage degree, the moisture content and temperature of particles in process time, was developed. Taking into account changes of the evaporation surface due to an increasing particles coverage degree in the encapsulation process allows to describe the evolution of particles parameters more adequately and to select of process rational parameters.

Research of the influence of abrasive wear of grinding bodies in the rotational vibration mill

Frolov, Vladimir, Blinichev, Valerian, Bogorodsky, Anatoly, Vetyugov, Alexander
Article
2017
This paper presents the design of a new rotational vibration mill. Experimental research of abrasive wear of grinding bodies in the processing of quartz sand was conducted. The influence dependences of varied process parameters on the specific wear of grinding bodies are demonstrated. Besides, the influence dependence of particle size on the specific wear value is shown.

Metal foams as structural packing in the construction of process equipment

Dyga, Roman
Article
2017
The paper presents possibilities of the application of open-cell metal foams in the construction of process equipment. The article also describes results of own experimental studies on hydrodynamic and thermal phenomena occurring during fluid flow through channels packed with aluminium alloy foams. The collected experimental data enabled to determine, among others, pressure drops and the heat transfer coefficient, and to indicate main gas–liquid flow patterns.

Comparison of parameters co-fermentation process of municipal sewage sludge with excess sewage sludge from treated coking wastewater

Macherzyński, Bartłomiej, Włodarczyk-Makuła, Maria, Ładyga, Ewa, Pękała, Władysław
Article
2017
The study presents results concerning changes of physicochemical properties and biogas production during the co-digestion process. The sample constituted a mixture of raw and excess sludge that was inoculated and fermented. The sample is the abovementioned mixture with an addition of excess sewage. In the assumed test, the conditions of technological parameters of sewage sludge fermentation and its mixtures with sewage sludge coke did not differ from each other by more than 25% Therefore, excess sewage sludge from treated coking wastewater can be neutralized in the process of fermentation along with municipal sewage sludge provided a constant quality-quantitative control of sewage sludge and procedural parameters.

Simulation of the CDMM-P Paradigm-Driven Meta-Modeling Process

Zabawa, Piotr
Article
2017
This article presents a simulation of the process of meta-model creation. The meta-model (modeling language) is created according to the Context-Driven Meta-Modeling Paradigm (CDMM-P) with the help of its implementation – Context-Driven Meta-Modeling Framework (CDMM-F). The simulation process may be applied to meta-model creation in an evolutionary approach to meta-modeling or may be used to check correctness of the meta-model, or to test the CDMM-F framework. This paper is focused on the verification and testing mentioned above.

Influence of non-uniformity of cracking on calculation of deflection of reinforced-concrete elements, according to Eurocode 2

Szeptyński, Paweł
Article
2017
Formulae for the deflection of two examples of isostatic systems (simply supported beam, cantilever) were derived, accounting for influence of distribution of bending moments on cracking and beam stiffness distribution, according to EC2. Numerical analysis of the problem for the same two examples as well as for two further hyperstatic systems was performed using an iterative FEM algorithm. The influence of nonuniformity of cracking on deflection and distribution of bending moments was shown to be negligible in typical practical design problems, therefore also an estimation of deflection on the basis of the distribution of bending moments and the value of the factor αk obtained from linear solution (before redistribution) is shown to be justified.

Outlook for the implementation of selected Ambient Assisted Living concepts for panel building

Nicał, Aleksander
Article
2017
The paper presents an outline of the concept of Ambient Assisted Living that facilitates the daily functioning of elderly people living in panel buildings erected in the years 1970–1985. It describes the main assumptions of the concept and existing programs to support its implementation. The paper also contains characteristics and percentage share of the most popular building panel systems used in the construction process of residential buildings in Poland. Additionally, selected facilities for the elderly people in flats as well as the possibility of remodelling them for the installation of proposed bathroom environment, are presented.