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The inductive assemblies with variable geometry have recently been proposed for potential electromagnetic (EM) energy harvesting utilization. Such inductors are capable of changing their initial geometry under the influence of some external force, collecting additional magnetic flux and producing increased induced voltage. In order to evaluate performance of such inductors, regarding increase of its...
The energy harvesting applications becomes omnipresent, utilizing different harvesting techniques to collect energy from ambient. Recently, the electromagnetic field energy harvesting attracted attention, with objective to provide nearly unlimited power supply, particularly for variety of the low-power electronic devices. Furthermore, the inductive assemblies have been recognized as reliable, low...
Recently, the concept of energy harvesting has started to be considered and utilized in a variety of applications. The energy of the ambient has been exploited, employing different harvesting techniques, in order to provide the inexhaustible supply for the range of electronic devices. Concerning the energy stored in the electromagnetic field, among the known and prominent harvesting approaches, the...
The most known sources of the low-frequency electromagnetic field (EMF) can be found in electric power systems. Those systems and their power distribution parts have become the backbone of economic, technological and overall development of human society, intensely in modern-days. The actual humanity highly depends on the reliable power supply and thus a number of power distribution substations have...
The intensive increase of the number of population in modern cities demands a highly reliable power supply, requiring power distribution systems that will accomplish this challenging task. In order to increase the reliability of consumers supply, the additional power distribution substations are commonly installed, which in time become surrounded by the expanded residential areas. In consequence,...
Aluminum Conductor Steel Reinforced (ACSR) is usually applied for the power overhead transmission or distribution lines. Electric characteristics of applied materials, like aluminum and steel conductivity values, are always provided by the manufacturers, but not the ACSR steel core permeability. In order to investigate how important the steel core permeability is, this paper deals with the influence...
The soft-decision decoding methods for maximum-transition-run (MTR) codes have been considered extensively, in order to enable a wider implementation of MTR codes in magnetic recording systems. The approaches, named as the min-max in LC and the max-log MAP in LC have been proposed, emerging as reasonable solutions for MTR codes. Both methods force the soft-values propagation through the Boolean logic...
The Serbian electromagnetic field (EMF) monitoring network - SEMONT is a network of remote wireless sensor nodes that continuously measure EMF level in the environment, in order to assess the non-ionizing radiation exposure of the general population and perform a real-time dissemination of the assessment results to the public. This paper presents some details of implementation and results of the SEMONT...
Voltage and current measuring transformers must be accurate even in a case when measuring value is not strictly harmonic, but it contains some higher harmonics. For this reason, both measuring transformers must exhibit high linearity. This means that measuring transformers should not contain any ferromagnetic material, which is always nonlinear. Therefore, any measuring transformer must be air-cored...
Aluminum Conductor Steel Reinforced (ACSR) steel core is made of a nonlinear ferromagnetic material and usually, its permeability values are not known. Hence those values must be determined by measurements. For such measurements, two samples of torus transformer were constructed. Applying well known methods, for different primary currents and different frequencies, numerous hysteresis loops were measured...
The Serbian Electromagnetic Field Monitoring Network — SEMONT is based on autonomous, remote sensor nodes, capable to monitor in-situ electromagnetic field in the environment and to wirelessly communicate with the central control station, uploading/downloading data. The SEMONT information network is intended for continuous monitoring of the low and high frequency field sources, performing the assessment...
Having in mind the practically inevitable increase of artificial electromagnetic fields (EM) in the surroundings it is required to perform a proper assessment of the potential exposure of the general population. In order to diminish the public unawareness about the real-time level of the EM fields and exposure, the Serbian electromagnetic field monitoring network — SEMONT has started the initial measurement...
One of the consequences of the permanent increase of the electromagnetic (EM) field sources is the emergence of various systems for the remote monitoring of electromagnetic field. These systems are able to perform the continuous monitoring of the EM field in the environment utilizing the wireless sensor network technology. As a support to the authorities, to timely inform the general population on...
The Serbian electromagnetic field monitoring network — SEMONT, has recently started taking initial broadband continuous measurements of electromagnetic (EM) field in surrounding environment. The SEMONT system is designed to perform daily observations of EM field sources present in the area covered by sensors network. The measurement results are collected and stored into a centralized database of EM...
The constrained capability of maximum-transitionrun (MTR) codes are well known in magnetic recording systems. Unfortunately, these codes possess just a modest error correcting ability and thus they have to be used in combination with proven and powerful error correcting codes. In modern, iterative decoding framework, two decoders exchange soft-information, in order to improve their decisions. Thus,...
The inevitable increase of artificial electromagnetic (EM) field sources in surroundings has initiated the development of some modern systems for EM pollution observation. This paper presents a concept of the Serbian electromagnetic field monitoring network — SEMONT, which has been designed as an information network for automated, remote and continuous broadband EM monitoring in the environment. The...
Electromagnetic (EM) fields are hardly noticeable and usually unknown for the general population. This unawareness and imperceptibility can generate distrust among the public, resulting in increased concerns on exposure to the EM radiation. The solution to these problems lies in the EM emission control, taking measurements and having a proper results presentation and communication with the public...
Maximum a posteriori (MAP) algorithm and decoding with min-max approximations in Boolean logic circuits, had been independently considered as soft-decision decoding methods for maximum-transition-run (MTR) codes. These two approaches are confirmed as quite valuable, enabling MTR decoder to handle soft-values in framework of iterative decoding. In this paper further research of these methods has been...
This paper considers maximum a posteriori (MAP) decoding of the maximum transition run (MTR) codes, over two-head digital magnetic recording system. Decoding is based on Bayesian algorithm and computes a posteriori log-likelihood ratios (LLR) from codewords of the MTR code. In this paper we present simulation results for performance of the joint soft detection-decoding of a concatenation of MTR code...
The increasing number of electromagnetic emitters and need of covering wider territorial areas have caused the spatial density of radiated fields to constantly grow. It initiates alerting of the public opinion and of the governments about so-called electromagnetic pollution phenomena. As support for efforts of municipal and provincial agency for non-ionizing radiation protection, our team has suggested...
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