Eleonora Guseinoviene

Effects of weather conditions on electromagnetic field parameters

This study presents the results of electromagnetic field parameters measurements in an open area under different air temperature and humidity conditions. An attempt to consider the electromagnetic wave as a holistic harmonic oscillation, which takes into account all frequency components of the field at the measurement point, was also presented in this study. During the measurements, the closest electromagnetic radiation sources were taken into account. Therefore, measurements of field parameters were produced in specific frequency bands. For the simplification of large data, the spectrum decimation technique was applied. As a result, measurements and data processing were revealed to characterize the electric field strength and the magnetic flux density when air temperature increases. The field parameters dependences on air relative humidity have a decreasing tender.

Use of solar water heating system for oil contaminated soil treatment

Bioremediation is one of the most efficient and widely applied methods of biotechnology, which also plays an important role in cleaning the environment from pollution by oil and oil products as well as rehabilitating the soil. Time is a limiting factor which prevents the effective use of biological treatment method, since the biodegradation of oil products is highly dependent on the season of a year and takes place only during the warm period, when the microorganisms act as active decomposers. Biodegradation of oil and its products takes about 9 months in a temperate climate zone. By properly organizing the modern biological systems of treatment of soil polluted by oil products, considerably better result can be achieved compared to previously used methods. Soil heating is one of ways to increase the intensity of biodegradation process of oil products. For this purpose the solar energy, one of the alternative energy sources, was used. Changes of diesel fuel and heavy fuel oil concentrations in soil during cold and warm season were studied. In order to determine the heat transfer process in soil, the modeling of the part of defined solar system had been done. The modeling realized using FEM (Finite Element Method) computer software constituted on numerical solution of heat equation. Simulation results indicate the dependency of contaminated soil temperature from the outer air temperature as well as comparing the physical experiments with the modeling results. To summarize the results we can state, that the outcome of biological treatment of samples using solar-based heating system during cold and warm seasons was better in both cases of pollutants. Heat produced by solar collector intensified the process of degradation of pollutants: in samples with solar-based water heating system, the diesel fuel removal level reached 70 %, in case of heavy fuel oil - 46 %, and in control samples it was 54 % for diesel fuel and 26% for heavy fuel oil. The treatment time of soil contaminated with oil products decreased accordingly. The obtained results allow to propose new technological principles of remediation of polluted soil, which decrease the treatment time, and thus the cost, and extends the area of application of alternative energy sources.

A study on the electromagnetic fields in wind mills farm area

This study presents the mathematical model of electromagnetic waveforms parameters which can be used for determination of the electromagnetic pollution level in windmills farm. The electromagnetic field parameters such as electric field intensity and magnetic field density were measured by EMF detectors on different frequencies ranges. The measured values for the waveform reconstruction in time domain were processed using Inverse Discrete Fourier Transform (IDFT). Obtained wave shape of electric field strength as well as magnetic flux density allowed defining the general of electromagnetic radiation level in chosen measurement point of windmills farms which includes all electromagnetic radiation values from all possible nearby sources. Also analysis of electromagnetic radiation impact for environment was considered. The measurement parameters were compared with the limit values.

System of power supply and oscillating pulse current synchronous drive in power network

There are a number of electrical drives with oscillatory driven mechanisms. As a result it is possible to use oscillating movement electrical drives there. These drives create ineligible reactive power, therefore it is required to provide conductors with the bigger cross-section, to design reactive energy storage devices. Reactive power is objectionable in electrical power network. Thus, in order to ensure the best work of oscillating drive the necessity for searching of reactive power reduction or its use methods occurs. The aim of the research is to examine pulsed power supply and oscillating movement pulse current synchronous drive system, in order to minimize the reactive power usage from power supply network and increase drive efficiency. To achieve this purpose pulse power supply and oscillating movement drive system mathematical model was designed, the influence of selected pulsed power supply to oscillating movement, drive performance indicators was determined as well.

Statistical and Continuous Wavelet Analysis of wind speed data in Mardin-Turkey

In this paper, wind speed measurements are considered for Mardin region in Turkey. Mardin city is situated in East part of Turkey. Mardin is a mountainous area suitable for wind. And also, its wind energy potential is at an acceptable level. Wind speed data in this study, is obtained from the national meteorology station. This real-time measured data is suitable to international criteria. This annual data is related to the measurements of 2011, from January 1, 2011 to December 31, 2011. There are two important aspects of the study. First one is related to calculation of the statistical parameters for wind speed data. Here four parameters of a statistical distribution are calculated. These are mean value, standard deviation, skewness and kurtosis. Last two parameters are used to determine the non-Gaussian (or Gaussian) characteristics. In this study, the skewness and kurtosis parameters are are calculated and compared. Parameters indicate asymmetrical and non-Gaussian characteristics. Hence the wind speed distribution is defined by Weibull distribution and its probability density function is shown for shape parameter and average speed of the wind. Thus the histogram and Weibull probability density function are calculated as well as the statistical findings. As a second aspect of the study, data is accepted as non-stationary. So its Continuous Wavelet Transform is used for the determination of the seasonal transitions and determined the time-frequency content. Thanks to the continuous wavelet transform, low and high frequency regions of wind speed data are distinguished. Continuous wavelet transform findings are quite satisfactory.

The Microwave Energy Harvesting by Absorbent Structures Based on Composite Materials

—This study presents two types of Salesbary Screen models which can be used for the microwave EMR harvesting in the occupational areas for the prevention case of the EMF impact for human health. The proposal structures operate on the 618GHz frequency electromagnetic radiation and allow collecting heating energy of the defined range. There are two types of fillers of 3% MWCNTs and 3% CNFs where considered in meaning of well electromagnetic radiation absorbency properties. The special attention had been paid for the outer, spacer and back layers thickness evaluation. The specific power as well as the total power in the proposal structures were calculated

Statistical analysis and Hurst parameter estimation for wind speed in Kirklareli area of Turkey

In this study, a wind speed data of the Kirklareli region of Turkey is considered and Hurst parameter is calculated for this data. For this purpose at first statistical parameters of the wind speed data are calculated. And, as a result of this analysis it is determined as a non-gaussian distribution. After that, it is shown as Weibull distribution and its statistical parameters are computed. The Hurst parameter is a special indicator to present the long range dependency and self-similarity. According to the results of this analysis, it can be determined as 0.256 and it is used as an indicator of long range dependency as well as its fractal dimension. In this manner, this is an original study to this field as well as the statistical analysis. As a one of the most important results, the finding of this study shows that the wind speed data has an autocorrelation function hyperbolically.

Equivalent mechanical parameters of oscillating rotary motors used in transport equipment

Abstract In various appliances and equipment of sundry transport means there is a lot of diverse mechanisms of periodical movement. So, the various piston or membrane pumps of fuel feeding and lubrication systems, circulation pumps, air and refrigerating coolant compressors, etc. are the typical examples of innovative and well promising application of the oscillating motors. In these cases the moving part of a motor can be directly connected to the working body of driven mechanism without the additional gears. Consequently, the drive can be simplified in design and improved in efficiency and reliability. Application of the oscillating rotary motors, if used in the aforesaid devices, strictly depends on specific properties of mechanical system of a motor aggregated with the driven mechanism and considered as the one‐piece unit on the whole. So, this study analyses how the properties of mechanical system, comprised of two moving parts interconnected eccentrically or centrically, can be evaluated by the equi...