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The combination of a real experiment with a virtual one in the electrical engineering education increases the students' interest for the subject and makes the material easier to comprehend. In the following paper, there are examples about demonstrating such complementation and about checking and visualisation an analysis of simple electrical circuits.
Induction heating and melting is a thermal method of metal treatment widely used in practice. The advantages of this method are high speed of heating, great efficiency factor, small losses, possibility for local heating and others. The main problem of the three-phase induction devices with a radial position of the inductors is the presence of a rotating magnetic field. The present paper presents a...
One of our most vital resources nowadays is fresh water. Water quality refers to the condition of the water, including chemical, biological and physical characteristics with respect to its suitability for a particular purpose. The main purpose of this publication is to set up a virtual system for water analysis in order to measure particular parameters of the water before and after physicochemical...
Decline of environmental noise and subsequent pollution are one of the most important purposes for citizens, scientists and public representatives nowadays. Many European legislative initiatives and studies deal with environmental noise monitoring. The enabling factor for this ongoing development is the availability of low-cost and low-power devices for sensing, computing and communication. Systems...
This paper presents a LabVIEW based system of acquisition, processing and analysis of ECG (electrocardiogram) signals. Biomedical signal acquisition has made great advances in recent years due to the introduction of modern hardware and software technologies. Computer based signal processing systems are becoming an efficient approach for acquisition and analyzing of such signals. In our implementation...
The water quality analysis is important for human health and environmental protection. There are many physical and chemical methods for such analysis, with different accuracies, complexity and time consumption. In the presented paper, a colorimetric method, based on virtual instrumentation is suggested and considered in details. At the end of the paper, the concentration of free chlorine in water...
This paper describes the design and implementation of a natural sensor-based interface intended for 3D graphics software packages and virtual reality (VR) environments. The interface operates through natural pointing gestures and replaces the conventional pointing devices which are usually used to interact with such software environments. It is implemented on the basis of the motion capturing sensor...
The Generalized Nets apparatus is applied here to describe the MiMa-algorithm for computing a conflict-free schedule for packet switch. In the paper we propose a family of patterns for nonuniform traffic simulation. The results for throughput on a switch node with MiMa-algorithm by computer simulations with these patterns are presented. The necessary computations have been executed on BG01-IPP grid-cluster...
Induction heating and melting is a widely used thermal treatment method. It is associated with small losses of electric power and it's also enables local heating at specific points of the item. In using three-phase inductors at industrial frequency, a problem occurs associated with the occurrence of a rotating magnetic field. The construction suggested in this publication eliminates this problem....
Noise pollution in urban environments is a common problem that affects people's health and quality of life. It is therefore one of the main issues addressed in many studies of environmental noise level assessment. The equivalent sound pressure level (LAeq) is one of the most widely used indicators for evaluating environmental noise from roads, railways, and industry. According to the European framework...
The precise localisation of rail vehicles is fundamental to the development and employment of more efficient train control systems in security, logistics and disposition applications. A key element of this is the exact and reliable velocity and distance estimation. The popular satellite navigation (global navigation satellite systems) and visual odometry, based on optical systems, tend to fail in...
Carbon dioxide sensors are extensively used in modern ventilation systems. Their accuracy and long term stability can crucially affect the overall effectiveness of the systems. This study is focused on the investigation of the possibilities for improving the accuracy of the most often used CO2 sensors in ventilation systems, namely the non-dispersive infrared (NDIR) sensors. An important problem with...
In this paper a reduced generalized net (GN) that represents the functioning and the results of the work of an arbitrary Kahn process network (KPN) is defined. The constructed GN is universal for all KPNs. Representation of process networks with bounds (PNB) is also discussed.
This research aims to gain an understanding of how Single Wagonload (SWL) services, policy and practice can benefit from the implementation of scientific methods and information technologies. For the purposes of this research a discussion on EU rail freight transport and current SWL trends is presented. An evaluation of EU rail freight policy is offered, followed by a discussion on policy measures...
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