Acta Mechanica Slovaca, 2013 (vol. 17), issue 3
Customized Implantat ManufacturingEditorial, Editorial article
Jozef Živčák
Acta Mechanica Slovaca 2013, 17(3):4
Dust Mass Concentration Measurement Based on Light Scattering Principle
Róbert Szabó, Miroslav Badida
Acta Mechanica Slovaca 2013, 17(3):6-11 | DOI: 10.21496/ams.2013.026 
Paper deals with dust mass concentration measurement via using light scattering principle. This method enables continual monitoring of dust mass concentration. It is possible to identify leaks of dust and damage of filters. Light scattering principle depends on shape and color of dust particle. For this reason it is necessary to calibrate directly on measurement place, where is dust source located.
Biomechanical Analysis of Bone Healing at One-Plate and Double-Plate Fixation of Femoral Bone Fractures
Jarosław Sidun
Acta Mechanica Slovaca 2013, 17(3):12-17 | DOI: 10.21496/ams.2013.027
The present paper present describes so-far unsolved issues of the biomechanics of the bone - plate stabiliser system functioning in a multi-plane system. The few available publications treat this question selectively and often generally. There are no reports which would provide data on the influence of the geometry of a Polfix type plate stabiliser system on the speed of the long bones synostosis process. Clinical practice shows that using an improperly selected fixation system and inappropriate biomechanical stabilisation conditions leads to an inappropriate course of the synostosis process. On the basis of distortion vector maps, the location of...
Influence of Torso Model Accuracy on the Noninvasive Localization of Heart Pathologies
Milan Tyšler, Jana Švehlíková, Olena Punschykova, Jana Lenková
Acta Mechanica Slovaca 2013, 17(3):18-25 | DOI: 10.21496/ams.2013.028
The influence of the fidelity of an inhomogeneous torso model on the noninvasive inverse localization of selected heart pathologies was studied. It was supposed that the pathology is small enough to be represented by a single dipole. In the simulation study the accuracy of localization of an ischemic lesion was investigated. 18 ischemic lesions in the ventricles were modeled and corresponding ECGs were simulated in 7 CT-based realistic torso models. Position of each lesion represented by a single dipole was then searched by an inverse solution using different approximations of the torso and heart. If the realistic CT-based torso and heart model was...
Proposal of Dissemination and Broadcasting of Laboratory Data within Small Time Latencies
Ladislav Madarász, Vladimír Gašpar, Imre J. Rudas, Rudolf Andoga, Ľuboš Gašpar
Acta Mechanica Slovaca 2013, 17(3):26-32 | DOI: 10.21496/ams.2013.029
This paper presents the possibilities of broadcasting and dissemination of experimental data, obtained from direct real-time measurements of a physical objects - small turbojet engine MPM-20. The key factor of this data transfer is to minimize latency of the data transfer and computational overhead that may slow down or jam the control computer. This is why the usage of UDP protocol has been proposed. Since the utilization of the existing measuring aperture with both original hardware (HW) and software (SW) acquisition equipment is necessary, the proposed solution is not created using modifications of original HW and SW modules but the addition of...
Possibilities of Using Plastics in the Design of Water Heater Tank
Natália Jasminská, Tomáš Brestovič
Acta Mechanica Slovaca 2013, 17(3):34-41 | DOI: 10.21496/ams.2013.030
This paper deals with the design of a pressure tank for a water heater. Today, new materials and technologies come to the fore at which especially the price for product is of significance. Within Europe, only steel pressure water heaters are produced in series. The design considers the use of an alternative material, namely the plastic. By design optimization, it would be possible to minimize costs for production, as the plastic is a good insulating material, and it is not needed to spend financial means for enamelling, and this material does not require cathodic protection. There are plastics on the market that meet requirements for resistance, they...
Availability as an Operational Efficiency Indicator of Medical Equipment
Gleb Donin, Peter Kneppo
Acta Mechanica Slovaca 2013, 17(3):42-48 | DOI: 10.21496/ams.2013.031
The problem of operational efficiency assessment of purchased medical equipment is becoming critical, due to increasing public spending on medical devices. It has been shown that a significant amount of medical equipment is not in an operable state, for many different reasons. Commonly used complex operational efficiency indicators take the standby and down states of medical equipment into account together, as they do not have the potential to provide separate analyses of the efficiency of medical device management at healthcare facilities. Thus, the goal of this study was to identify and describe indicators for a more detailed assessment of operational...
The Use of KNX/EIB to Control Devices in an Intelligent Home
K. Dzierzek
Acta Mechanica Slovaca 2013, 17(3):50-54 | DOI: 10.21496/ams.2013.032
In the paper made in the Department of Automation and Robotics, intelligent control system implemented in a standard KNX/EIB. Presented is a system and then presents the rules for the design and programming devices. Showing a sample system design, where students will learn the configuration and programming.
Model-based Approach to Development of Engineering Systems
Jozef Živčák, Tatiana Kelemenová, Michal Kelemen, Vladislav Maxim
Acta Mechanica Slovaca 2013, 17(3):56-62 | DOI: 10.21496/ams.2013.033
The control functions for most engineering systems (automotives, aeroplanes, medical devices and other devices involve large quantities of software. Because of the great complexity involved and the safety requirements, manufacturers must absolutely guarantee that the device software has exactly the functions that were specified and that the functions work as defined. Thus, the specifications themselves must contain unambiguous, comprehensive function descriptions. Model-based development, in which a function is described by graphical models in MATLAB®/Simulink®/Stateflow®, is a proven method of implementing these requirements.
Effect of Whole Body Vibration on Functional Mobility in Elderly Patients
Jaroslav Majerník, Jozef Živčák
Acta Mechanica Slovaca 2013, 17(3):64-69 | DOI: 10.21496/ams.2013.034
Whole body vibration (WBV) represents one of the most serious problems in industries. There is a discussion about effects of long-term WBV exposures on employees' health state in scientific community. However, therapeutic usage of WBV may be beneficial for various groups of patients due to the reports of enhanced muscular strength, power or even bone density. The purpose of this study was to investigate immediate response of single WBV training unit on mobility of older individuals with various neurological disorders. Twelve patients (67.0 ± 3.54 years, 4 males and 8 females) were assessed before WBV (10 min, vertical 2 mm, 30 Hz) and then 1...
The Presence of Volatile Organic Compounds (VOCs) Indoors During the Heating Season: in situ Emission Study of a Frame-house
Csilla Patkó, István Patkó, Zoltán Pásztory
Acta Mechanica Slovaca 2013, 17(3):70-78 | DOI: 10.21496/ams.2013.035
Due to the more stringent energy regulations the air-tightness and insulation of buildings is much higher than in old buildings. As a result of synthetic building materials and reduced air exchange rates indoor air quality is deteriorating significantly. In this study we examined the indoor air quality of a newly built, frame-house during the heating season. Formaldehyde (11-130 μg/m3), 3-carene (133-300 μg/m3) and alpha-pinene (130-300 μg/m3) values varied over a wide range depending on the indoor activities. We determined that further measurements are required on the subject during the summer period as well.
FEM Model for Studying Delamination in Fabric-reinforced Laminate Composites
Jacek Skrzypek, Jacek Stadnicki
Acta Mechanica Slovaca 2013, 17(3):80-86 | DOI: 10.21496/ams.2013.036
The following article shows the FEM model of a laminate composite reinforced with fabric made of roving of carbon fibres. The model considers the internal structure of the reinforcement. This model was used for a simulation of a crack propagation in the 16-layers of carbon fibre laminate. The analyses were conducted in reference to the first way of cracking. The results of the simulation were then compared with the results of the experiments.
Magnetic Resonance Image Artifact Due to the Examination Method and Scanning Sequences
Jozef Živčák, Marianna Trebuňová, Andrej Repovský, Galina Laputková
Acta Mechanica Slovaca 2013, 17(3):88-92 | DOI: 10.21496/ams.2013.037
Magnetic resonance (MR) belongs to the most important diagnostic and imaging methods. It is derived from classic nuclear magnetic resonance that is the method based upon the difference between the magnetic properties of the diverse nuclei. However, this method, as well as the other non-invasive imaging methods, is burdened by the presence of the numerous artifacts. In addition to the artifacts due to the patient, the artifacts due to the method and the scanning sequences exist. In this review the main types of MR artifacts due to the examination method and the scanning sequences are presented. The characteristic properties and the physical and the...
Method Comparison of the Evaluation of the Cylindricity Deviation Measured by Different Measurement Strategies
Miroslav Dovica, Ján Buša
Acta Mechanica Slovaca 2013, 17(3):94-97 | DOI: 10.21496/ams.2013.038
The aim of this paper is to compare the quantitative parameters of methods used for the evaluation of the cylindricity deviation. Data is measured by the contact method using three different strategies for cylindricity measurement on the coordinate measurement machine (CMM) Contura G2, Carl Zeiss. For particular measurement strategies, the data is evaluated by Calypso 5.0 software (CMM) Contura G2 and Matlab/Octave software. In order to compare the collected data, we use the parameters of possible axes positions of two coaxial cylinders and their least radial distance. In the last part of this paper, there is the discussion regarding obtained parameters...
Model of Solution Diffusions Through Membranes
Dušan Knežo
Acta Mechanica Slovaca 2013, 17(3):98-101 | DOI: 10.21496/ams.2013.039
There is created in this paper a model of the diffuse drainage of solutions through the membranes. The possibilities of such process simulations using of the differential equations are presented in this article as well.