Raimondas Buckus

Kopijavimo aparatu elektromagnetiniu lauku tyrimai ir ivertinimas

Santrauka Dirbant biuro vaizdo ir garso technikai susidaro elektromagnetiniai laukai. Daugelis darbuotoju, ilgai dirbanciu kompiuteriais, kopijavimo aparatais arba daug laiko praleidžianciu prie televizoriaus, skundžiasi galvos skausmais ar kitais negalavimais. Tai jau tapo didele problema, nes elektromagnetiniai laukai yra nematomi ir nejuntami, tad darbuotojas nežino, kaip nuo ju apsisaugoti. Elektromagnetiniu lauku stipriams ismatuoti ir ivertinti pasirinkta kopijavimo paslaugas atliekanti imone „Baltijos kopija”. Buvo ismatuoti ir ivertinti siu kopijavimo aparatu elektromagnetiniai laukai: Rock hooper // mutton, Vario Print 2110, Color Laner Jet 8550N, Ricoh Aficio 1060, Docular 2060, Colorgrafx ×2, Oce 9400, Oce 9400 II. Palyginimui ivairiu kopijavimo aparatuose susidaranciu elektromagnetiniu lauku rezultatai pateikiami grafikais.

Research and Assessment of Safety Distance of TV Electromagnetic Fields

The evaluation covers the strengths of electric field and magnetic flux denstiy measured in frequency ranges of 5 Hz–2 kHz and 2–400 kHz of selected TV sets. The dependence of the electromagnetic field on the distance is addressed with reference to ergonomics and safety. Ten TV sets (5 tube and 5 LCD) were measured. There were 16 measurements for each one. The aim was to evaluate electric field and magnetic flux denstiy versus the distance from the tested device with regard to exposure levels. In addition, the distance and the strengths of electric field and magnetic flux denstiy emitted by tube and LCD TVs were compared. The results are presented in charts.

Physical activity and physical fitness in obese, overweight, and normal-weight children.

BACKGROUND/AIM The aim was to assess the differences between physical activity and physical fitness in obese, overweight, and normal-weight children. MATERIALS AND METHODS The cross-sectional study was accomplished using cluster sampling method at 3 Lithuanian schools. An analysis of anthropometric data for 532 Lithuanian children was performed. Height, weight, waist and hip circumferences, and skinfold thickness were measured. Body mass index, waist-to-hip ratio, and body fat percentage were calculated. The Youth Physical Activity Questionnaire and a 6-min walk test (6MWT) were administered to evaluate physical activity and physical fitness. Maximal oxygen consumption was calculated to assess the childrens aerobic capacity. Correlations among anthropometric data, 6MWT-walked distance, and moderate-vigorous physical activity duration were analyzed. RESULTS The study showed that 20.1% of the studied children were obese or overweight. They engaged in moderate-to-vigorous physical activity 22.4 min less per day and walked 50.9 m less on average during a 6-min test than normal-weight children. Physical fitness parameters correlated with daily moderate-vigorous physical activity duration and with most of the childrens anthropometric parameters. CONCLUSION Obese and overweight children were less physically active and had lower physical fitness than normal-weight children. The findings underline the need for interventions to increase physical activity and improve fitness in obese and overweight children.

Research and evaluation of the intensity parameters of electromagnetic fields produced by mobile communication antennas

Abstract As the network of cellular mobile phones has recently expanded and in particular after the digital GSM 900/1800/2100 systems have been introduced, the potential effect on human health of electromagnetic radiation from the base stations of these systems has become of great concern to European countries. There have been requests made in some countries for areas free from mobile phones in which installation of base stations would not be permitted and for considerable reduction of the maximum authorised exposure or other restrictions. The European Commissions Recommendation adopted on 12 July 1999 requires that the maximum field strength for electromagnetic radiation (0–300 GHz) is established and that information about populations exposure to EMF and the measures taken to reduce it is provided. The article presents and analyses EMFs produced by mobile communication antennas in a residential area. Measurements of the electric strength, magnetic strength and EMF power density were performed and comp...

A Technical Approach to the Evaluation of Radiofrequency Radiation Emissions from Mobile Telephony Base Stations

During the last two decades, the number of macrocell mobile telephony base station antennas emitting radiofrequency (RF) electromagnetic radiation (EMR) in residential areas has increased significantly, and therefore much more attention is being paid to RF EMR and its effects on human health. Scientific field measurements of public exposure to RF EMR (specifically to radio frequency radiation) from macrocell mobile telephony base station antennas and RF electromagnetic field (EMF) intensity parameters in the environment are discussed in this article. The research methodology is applied according to the requirements of safety norms and Lithuanian Standards in English (LST EN). The article presents and analyses RF EMFs generated by mobile telephony base station antennas in areas accessible to the general public. Measurements of the RF electric field strength and RF EMF power density were conducted in the near- and far-fields of the mobile telephony base station antenna. Broadband and frequency-selective measurements were performed outside (on the roof and on the ground) and in a residential area. The tests performed on the roof in front of the mobile telephony base station antennas in the near-field revealed the presence of a dynamic energy interaction within the antenna electric field, which changes rapidly with distance. The RF EMF power density values on the ground at distances of 50, 100, 200, 300, 400, and 500 m from the base station are very low and are scattered within intervals of 0.002 to 0.05 μW/cm2. The results were compared with international exposure guidelines (ICNIRP).

Research and analysis of electromagnetic radiation from mobile telephone base station antennas in residential environment

The public concern about the potential adverse health effects of the human exposure to the electromagnetic radiation of base stations antennas has grown in the recent years. The increasing number of cellular telephony subscribers has led to an expansion of networks, with the installation of more base stations. This investigation aimed to provide information for the distribution of electromagnetic field power density created from antenna in the residential area in the Lithuania. We carried out measurements in different places: outdoors on the ground; outdoors in balcony; indoors 1.5 m close to windows, indoors, not close to the windows; indoors without the windows. The results are discussed and presented in charts. The measured values were well below the maximum permissible exposure levels in the adopted HN 80:2011 in our country.