The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In this paper we present the results of the low frequency magnetic fields measurements inside of two transformer and distribution stations in the country of Iasi. We made measurements in different areas inside two stations, near magnetic field sources and in control rooms, by using measurement instruments, which permit both spot measurements and long term survey of magnetic fields. The highest values...
In this paper a system for measuring impedance, based on AD5933 circuit is presented. The impedance measuring range is between 9 Ω and 18 MΩ for a 1 kHz ÷ 100 kHz frequency range. Possibilities of expanding this range of measurement are also presented in the paper. The system calibration is automatic and the relative error of the impedance modulus measurement is in the range ±2%. Measured impedance...
In this paper we determined and analyzed the Heart Rate (HR), based on the Electrocardiographic signals (ECG) recorded before, during and after magneto therapy sessions. The purpose of our study is to determine some possible changes in the biological signals in the case of people exposure to magnetic fields. Thus, we determined and analyzed Heart Rate dynamics, both in time-domain and in frequency...
Our approach aims to enlarge the application domain of a GPS-based tracker. We have configured the device using its configuration software, allowing us to organize multiple options for data acquisition and corresponding transfer between the device and the server. The first option was for SMS mode, mostly used in areas without GPRS (minimum 2.5 G) coverage or in situation of high price rates for GPRS...
This paper describes a study on the development of few textile structures and the possibility to use them in electromagnetic shielding and protection equipment manufacturing. The long-term exposure to electromagnetic waves can seriously damage a person's health. The goal of this research is: to evaluate the implementation possibilities of new materials and composite structure (using amorphous magnetic...
This paper presents a low-cost, portable, light weight, high performance device developed by the authors for electrocardiographic (ECG) and plethysmographic signals recording. The proposed system was tested and compared with clinical grade amplifiers, also noise and robustness tests have been conducted. The prototype permits both on line and off line working mode, being capable to record ECG data...
In this paper we study the influence of magnetic field, used for basic physiotherapy procedures, on brain electrical activity by analyzing the EEG signal. The recordings are performed in three conditions (before, during and after magnetotherapy) from electrodes placed in the scalp in the occipital region. For magnetotherapy procedure was used typical equipment with cylindrical coil of 60 cm diameter...
In the present paper the specific absorption rate (SAR) in 10 g of tissue mass was determined by means of electromagnetic field simulation using CST software for GSM 900 and GSM 1800 frequencies. In this scope far field exposure of a human head model, SAM phantom (specific anthropomorphic Mannequin) was analyzed and the results have been compared for different far field sources.
In this paper we studied the influence of noise when extracting QRS from electrocardiographic (ECG) signal by means of Wavelet Multiresolution Analysis. Thus, we have made a time detection of QRS waves and heart rate both on a electrocardiography signal (ECG) and on the same electrocardiography signal over that overlapped different types of noises (white noise, 50 Hz noise, Gaussian noise and their...
This study investigates the influence of the 50 Hz electromagnetic exposure on heart rate variability (HRV). Thus, we recorded and preceded the ECG signals for 44 volunteers both in high and normal field exposure. The acquisition system and the QRS detection algorithm were developed by the authors with the view to be used in this study. Spectral measurements of the HRV revealed a significant increase...
On the basis of the measured levels of electromagnetic environment due to radio-communication transmitters and mobile communication systems (90 MHz ÷ 2.2 GHz), both the relative exposure levels — RE and the relative specific absorption rate -RSAR were calculated. The specific absorption rates — SAR were determined by simulations made with CST Microwave Studio software using some head models: a spherical...
Measuring the electric field due to wireless communication systems is an important part for determining the electromagnetic pollution of the environment and consequently human exposure to these fields. Many difficulties need to be considered when performing these tests. An automated electric field measurement system is presented in this paper, associated with a statistical analysis of the results...
Electrosurgery devices are an important part of surgical interventions in the modern medical service; however the benefits of using such technology are accompanied by side effects like electromagnetic pollution of the hospital environment. As a consequence, the maximum admitted levels of electric and magnetic fields for general public and occupational exposure could be exceeded in some cases and the...
These biological signals, such as those from the heart and brain, are routinely used for both diagnostic and therapeutic purposes. The aim of this study is to obtain a software application used to observe the ECG activity during pulse magneto therapy taking into account that this procedure is frequently used for a lot of diseases.
The purpose of this paper is to determine the specific absorption rate (SAR) in the human head in 10 g of mass tissues due to mobile phone exposure with walls nearby. The mobile phone was modeled as a λ/4 monopole antenna placed at a distance of 1 mm from the human head and the SAR values were determined using CST software for two GSM frequencies, 900 and 1800 MHz taking into consideration different...
This paper presents a virtual instrument for biosignal systems monitoring. Due to various artifacts, ECG signal acquired by data acquisition systems may contain high level of noise. These conditions, in real life situations, may vary from no noise to extreme amount of noise corrupting the biosignals. Thus, ideal ECG signal processing systems must consider various levels of noise and should have a...
The electromagnetic compatibility of medical devices in the hospital is important to ensure the correct functioning of these devices. In this paper the characterization of a medical device as a source and as a victim of electromagnetic fields is presented, along with other possible sources and victims of electromagnetic fields. The source considered to determine the interference with the medical device...
In the present paper, the values of SAR in case of human exposure to mobile phone was determined via different methods. For SAR values determination were studied and compared two case of exposure, one in near field and other in far field. Also it was determined the SAR in human head depending by distance between human head and the mobile phone. The values obtained by numerical simulation using adequate...
The proposed system presented in this paper is able to monitor biosignals and to transmit relevant information remotely. Artificial intelligence improves the biosignals monitoring efficiency and help critical caretakers to speed up a prior diagnose. This application demonstrates how to develop new wireless intelligent system, to be future used in processing, analyzing and extracting necessary features...
In this paper, using Wavelet Multi-Resolution Analysis, are extracted QRS complex and T wave and some feature of electrocardiographic (ECG) signal acquired in order to obtain the accurate time localization. The results consist in representing the amplitude and duration of QRS complex, the Heart Rate Variability's (HRV) representation and also the characteristics of T wave representation.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.