scholarly journals Assessment of short/long term electric field strength measurements for a pilot district

Open Physics ◽  
2018 ◽  
Vol 16 (1) ◽  
pp. 69-74
Author(s):  
Cetin Kurnaz ◽  
Dogan Yildiz ◽  
Serap Karagol
Keyword(s):  
Mathematical Model ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Cellular Systems ◽  
Base Stations ◽  
Short Term ◽  
Technological Developments ◽  
Day By Day

Abstract The level of electromagnetic radiation (EMR) exposure increases day by day as natural consequences of technological developments. In recent years, the increasing use of cellular systems has made it necessary to measure and evaluate EMR originating from base stations. In this study, broadband and band selective electric field strength (E) measurements were taken at four different times in order to evaluate the change of short term E in Atakum district of Samsun, Turkey. The measurements were collected from 46 different locations using a SRM 3006 and a PMM 8053 EMR meter in a band from 100 kHz to 3 GHz, and the maximum E (Emax) and the average E (Eavg) were recorded. The highest values have been noticed in these measurements at 9.45 V/m and 17.53 V/m for Eavg and Emax respectively. Apart from these measurements, 24 hour long term E measurements were taken at a location where the highest value was observed and analyzed, to observe the change of Es during a day. At the end of the study, a tentative mathematical model that helps in computing the total E of the medium with 95% accuracy, was obtained.

ANALYSIS OF ELECTRIC FIELD STRENGTH AND POWER AROUND SELECTED MOBILE BASE STATIONS

2018 ◽  
Vol 179 (4) ◽  
pp. 383-390 ◽  
Author(s):  
P Deatanyah ◽  
J K Amoako ◽  
E K K Abavare ◽  
A Menyeh
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Base Stations ◽  
Mobile Base

scholarly journals Mathematical model of colostrum defrosting in super-high-frequency generator equipped

2021 ◽  
Vol 935 (1) ◽  
pp. 012027
Author(s):  
I Ershova ◽  
M Prosviryakova ◽  
O Mikhailova ◽  
G Novikova ◽  
G Samarin ◽  
...  
Keyword(s):  
Mathematical Model ◽  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
High Frequency ◽  
Electromagnetic Waves ◽  
Raw Material ◽  
Operating Modes ◽  
High Frequency Electromagnetic Field ◽  
Super High Frequency

Abstract The paper is devoted to development and parameters studying of two-resonator super-high-frequency (SHF) generator based on continuous flow principle of action. It is equipped with two quasi-stationary toroidal resonators; so it allows to separate such processes of cattle colostral milk treatnent as defrosting and heating and thus to ensure both the electromagnetic safety and the high electric field strength. In order to improve efficiency of the cattle colostrum defrosting/heating performed by its exposure to the super-high frequency electromagnetic field, the methodology was developed for the SHF generator designing. It includes, firstly, development & studying of mathematical models based on due consideration of the phase transitions and, secondly, the structural designing of the SHF generator working chamber with examination of its effective operating modes. The mathematical model is proposed of the electromagnetic waves interaction with the raw material (colostral milk) being in different physical states. With aid of the electric field strength control (by the generators power changing) and the gap adjustment in the capacitor part of the resonators (by smooth movement of the common perforated base), it is possible to achieve the equipment capacity up to 170… 200 L/h. The energy expenses are 0.025 (kWh)/kg.

scholarly journals Power Density Measurement within Kaduna North Area of Kaduna State, Nigeria

2021 ◽  
pp. 1-4
Author(s):  
Bello Ayodeji ◽  
Nicodemus Kure Kure ◽  
Isaac Daniel ◽  
Emmanuel Adoyi ◽  
Esther Obiechile ◽  
...  
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Power Density ◽  
Density Measurement ◽  
Base Stations ◽  
Exposure Level ◽  
Exposure Limits ◽  
Mean Power ◽  
Rf Antenna

The measurement of possible presence of radiofrequency (RF) radiations from telecommunication base stations was carried out within Kaduna North Area of Kaduna State, to estimate the maximum level of power density from RF radiations to which the member of the populace within specific radius from the base transceiver station (BTS) are exposed to in relation to the existing guidelines to human exposure. Power density S (µWm-2) measurements were made at interval of 20 m to check the exposure level at public locations from 10 RF antenna sites starting from the foot of each BS to distance (radius) of 100 m using Aaronia Spectran HF-4060 Analyser and the electric field strength E (Vm-1) were calculated. The highest and lowest value obtained from measured mean power densities were 108.27 µWm-2 and 94.74 µWm-2 from a distance of 100 m and 40 m respectively. Also, the highest and lowest average electric field strength were 202.03 (Vm-1) and 188.99 (Vm-1) at 100 m and 40 m respectively. The result obtained, indicates that the measured values were far less than the permissible exposure limits for both workers and the general public as set by the International Commission on Non-ionizing Radiation Protection (ICNIRP). These results shows that the exposure levels in these areas are low and as such will not pose significant health risks to the people living in the study area.

scholarly journals Empirical analysis of electric field strength long-term variability for GSM/DCS/UMTS downlink band

2016 ◽  
Vol 8 (2) ◽  
pp. 87-92 ◽  
Author(s):  
Mladen Koprivica ◽  
Majda Petric ◽  
Milica Popovic ◽  
Jelena Milinkovic ◽  
Aleksandar Neskovic
Keyword(s):  
Field Strength ◽  
Electric Field ◽  
Electric Field Strength ◽  
Empirical Analysis

Weibull Distribution Function Based on an Empirical Mathematical Model for Inactivation of Escherichia coli by Pulsed Electric Fields

2003 ◽  
Vol 66 (6) ◽  
pp. 1007-1012 ◽  
Author(s):  
D. RODRIGO ◽  
G. V. BARBOSA-CÁNOVAS ◽  
A. MARTÍNEZ ◽  
M. RODRIGO
Keyword(s):  
Escherichia Coli ◽  
Mathematical Model ◽  
Distribution Function ◽  
Field Strength ◽  
Electric Field ◽  
Weibull Distribution ◽  
Electric Field Strength ◽  
Inactivation Kinetics ◽  
Carrot Juice ◽  
Weibull Distribution Function

The pulsed electric field inactivation kinetics of Escherichia coli suspended in orange juices with three different concentrations of carrot juice (0, 20, and 60%) was studied. Electric field strengths ranged from 25 to 40 kV/cm, and treatment times ranged from 40 to 340 μs. Experimental data were fitted to Bigelow, Hülsheger, and Weibull distribution functions, and the Weibull function provided the best fit (with the lowest mean square error). The dependency of each model's kinetic constant on electric field strength and carrot juice concentration was studied. A secondary model was developed to describe the relationship of Weibull parameters a and n to electric field strength and carrot juice concentration. An empirical mathematical model based on the Weibull distribution function, relating the natural logarithm of the survival fraction to treatment time, electric field strength, and carrot juice concentration, was developed. Parameters were estimated by a nonlinear regression. The results of this study indicate that the error rate for the model's predictions was 6.5% and that the model was suitable for describing E. coli inactivation.

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