Cost – Effective Integrated Capacitive Sensors for Efficient Bacteria Detection

Dragana VASILJEVIĆ, Sanja KOJIĆ, Milan RADOVANOVIĆ, Bojana PRIVAŠ, Ana TADIĆ, Siniša MIRKOVIĆ, Deana MEDIĆ

This paper represents design, fabrication and characterization of non-invasive capacitive sensor for oral bacteria detection. The sensor was fabricated in Printed Circuit Board (PCB) technology and it consists of a pair of interdigitated electrodes. Measurement setup for testing and characterization has been developed in laboratory conditions. The characteristics of sensor – the capacitance as a function of frequency for a different bacteria solution and different sensor sizes are presented. The obtained results demonstrate different resonant frequencies for each bacteria which can be used for its detection.

Localization of Mobile Robots Using Machine Vision and QR Codes

Svetislav ĆIRIĆ, Nemanja JANKOVIĆ, Nenad JOVIČIĆ

Due to the increase in applications of mobile robots there is growing need to support their autonomy with good localization. As the camera takes its place as one of the most important sensors in robotics a great number of algorithms for image processing is being developed every day. This paper focuses on detecting multiple robots on the field with three cameras set in the pre-defined places. The detection and identification is done by using QR codes via OpenCV functions library. The designed localization provides a robust algorithm for detecting and following mobile robots which enhances their autonomy with the ability to dynamically decide on the strategy of movement and paves the way for future applications of the combination of QR codes and machine vision.

Indoor Localization of Mobile Robots Using Active LED Beacons

Bojana GAJIĆ, Nemanja JANKOVIĆ, Slobodan KOPRIVICA, Nenad JOVIČIĆ

In this paper we present concept of using active beacons and machine vision approach for indoor localization of mobile robots. The system includes several cameras placed around the planar terrain in which robots are moving, active beacons mounted on top of each robot, electronic devices with wireless communication units and computer running image processing algorithm. The basic idea lies in robust background suppression method enabled by possibility to timely control the emission intensity of LED beacons. The concept is verified by experimental results, and tested using earlier developed referent system.

Using the Analytic Hierarchy Process in Long-Term Load Growth Forecast

Blagoja STEVANOSKI, Nataša MOJSOSKA

The load growth is the most important uncertainties in power system planning process. The application of the classical long-term load forecasting methods particularly applied to utilities in transition economy are insufficient and may produce an incorrect decisions in power system planning process. This paper discusses using the method of analytic hierarchy process to calculate the probability distribution of load growth obtained previously by standard load forecasting methods.

Using Regulated Drive of Vibratory Screens with Unbalanced Motors

Željko V. DESPOTOVIĆ, Aleksandar PAVLOVIĆ, Jelena RADAKOVIĆ

Vibratory screens are machines that, when subjected to the mechanical vibration, carry out the separation of material mixtures to granulation, or to fractions. The number of fractions depends on the number of storeys on a vibrating screen. This paper discusses the regulated electric drive of vibratory screens with one storey, used to separate the boiler ash from the slag (bottom ash) in the Thermal Power Plants TENT-B, Obrenovac. Some of the important parameters of vibratory sieving are frequency and amplitude of vibrations, tilt angle of the vibratory screens, and the angle of the actuating force acts on the vibrating screen. The proposed technical solution is provided to adjust all of these parameters. The synchronous operation of vibratory exciters is requested, as well as the work of vibratory screens in super-resonant mode. The paper presents the experimental results and determining the amplitude-frequency (AF) characteristics of the vibrating screens.