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Article
Publication date: 24 July 2019

Dejan B. Jovanovic, Vladimir Stankovic, Nenad N. Cvetkovic, Dejan Krstic and Dragan Vuckovic

The purpose of this paper is to determine the impact of human age on the distribution of electric field and absorbed energy that originates from a mobile phone.

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Abstract

Purpose

The purpose of this paper is to determine the impact of human age on the distribution of electric field and absorbed energy that originates from a mobile phone.

Design/methodology/approach

This research was performed for frequencies of 900, 1800 and 2100 MHz, which are used in a mobile communication system. To obtain the most accurate results, 3 D realistic model of the child’s head has been created whereby the dimensions of this model correspond to the dimensions of a seven-year-old child. Distribution of the electric field and specific absorption rate (SAR) through the child’s head was obtained by numerical analysis based on the finite integration technique.

Findings

The results discover that amount of absorbed energy is greater in the surface layers of the child’s head model when the electromagnetic (EM) characteristics of tissues are adjusted for the child. This deviation corresponds to different EM characteristics of biological tissues and organs of an adult person compared to a child.

Research limitations/implications

The study deals with penetrated electrical field and absorbed EM field energy. There is space for further studies of other EM field effects (e.g. thermal effects).

Practical implications

The analysis of obtained results leads to idea that mobile phones and devices aimed for children using should be modified to provide SAR values inside prescribed standards.

Social implications

The obtained results are foundation for future research on influence of EM fields of mobile devices on human health.

Originality/value

The proposed procedure offers the model for accurate estimation and quality analysis of SAR and EM field distribution inside child head tissue.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 38 no. 5
Type: Research Article
ISSN: 0332-1649

Keywords

Content available
Book part
Publication date: 19 February 2021

Aleksandra Pavićević

Abstract

Details

Funerary Practices in Serbia
Type: Book
ISBN: 978-1-78769-182-7

Abstract

Details

Funerary Practices in Serbia
Type: Book
ISBN: 978-1-78769-182-7

Abstract

Details

Funerary Practices in Serbia
Type: Book
ISBN: 978-1-78769-182-7

Article
Publication date: 17 August 2018

Nataša Krstić and Dejan Masliković

The purpose of this paper is to identify the common issues affecting the cultural institutions’ websites in terms of organic search visibility and to detect if there are some…

1320

Abstract

Purpose

The purpose of this paper is to identify the common issues affecting the cultural institutions’ websites in terms of organic search visibility and to detect if there are some category specifics for the national libraries, archives and museums.

Design/methodology/approach

In the first phase, an online survey was conducted involving the cultural institutions of national importance, aiming to map the current state of their websites in organizational and functional terms, to collect the information about the used domains, their social media activity and the use of analytical tools to monitor the visitor behavior and online traffic. In the second phase, the cultural institutions’ websites were analyzed using the “White Hat SEO” technics of optimization on Google.

Findings

From the category perspective, the historical archives have the best Technical search engine optimization (SEO) position due to the low coding errors and fair site speed, the libraries are leading in content generation and the museums have a very good total SEO index due to their strong social media activities. Common issues are detected in the description of web images, non-existence of sitemaps and low website mobile friendliness.

Research limitations/implications

The data were collected from the personnel of the national cultural institutions based on their pre-assumed knowledge and understanding of website management.

Practical implications

The research methodology can be used to analyze the organic visibility of any national culture on search engines.

Originality/value

A research gap in addressing the cultural institutions’ websites from the search engine perspective was identified and addressed within the paper.

Details

Library Hi Tech, vol. 37 no. 3
Type: Research Article
ISSN: 0737-8831

Keywords

Article
Publication date: 11 September 2023

Dejan B. Jovanovic, Dragan Krasic, Nenad N. Cvetkovic, Dragan Vuckovic and Vladimir B. Stanković

The purpose of this paper is to determine the electric field and specific absorption rate (SAR) distribution within biological tissues in the vicinity of dental implants, exposed…

Abstract

Purpose

The purpose of this paper is to determine the electric field and specific absorption rate (SAR) distribution within biological tissues in the vicinity of dental implants, exposed to the mobile phone radiation.

Design/methodology/approach

This research was performed for the frequency of 2.6 GHz, which corresponds to 4G mobile network. The adequate 3D realistic numerical models of the mobile phone user’s head, dental implants and actual smartphone model are created using packages based on the finite integral technique numerical method.

Findings

The obtained results yield to a conclusion that the presence of dental implants affects the increase in electric field intensity and SAR values within biological tissues in its vicinity.

Research limitations/implications

The presented procedure is limited to the 4G mobile network frequency of 2.6 MHz. The study should be extended to other mobile network frequencies to be more general.

Practical implications

The criteria for selection of the materials used for dental implants production should be extended with the recommended material characteristics related to their influence on the electric field and SAR distribution, to keep their values in the limits prescribed by standards.

Social implications

The obtained results provide the foundation for future research in mobile devices’ electromagnetic fields’ influence on human health.

Originality/value

The accurate determination of the electric field and SAR values within different biological tissues and organs in the vicinity of dental implants exposed to mobile phone electromagnetic radiation, demands highly realistic model of observed biological structures. For purposes of the current study, the procedure for modeling of highly nonhomogeneous structure with finite number of homogenous domains having known electromagnetic parameters is described in the paper. As a result, the 3D complex users’ head model formed of 16 homogeneous domains of different electromagnetic parameters is created.

Details

COMPEL - The international journal for computation and mathematics in electrical and electronic engineering , vol. 42 no. 5
Type: Research Article
ISSN: 0332-1649

Keywords

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