IOSR-JAP   Volume-6 ~ Issue-1 ~ Jan-Feb 2014

ABSTRACT: In this paper, we present the study of RF radiation from mobile tower and its health effects on human body. Power density of RF radiation from a mobile tower have been measured in close proximity to the mobile base station (GSM 900) at the selected locality in Aizawl, Mizoram, India, which was erected in 2009. Questionnaire was conducted on different health problems faced by the inhabitants living near the base station. The absolute power densities have been measured at different houses which is compared with standard limits given by various authorities like International Commission on Non Ionizing Radiation Protection (ICNIRP), Bioinitiative : 2012 and with the current Indian Standards. Frequency spectrum was analysed at different sites. Different health symptoms of RF exposure faced by the inhabitants within 50m and outside 50m from the tower are analysed and compared. The result is also analysed based on sex. It was found that the inhabitants living within 50m are having more health complaints than those living outside 50m. It was also found that females are having more complaints than males. This type of study is the first time report in the state.

Key words: RF, Non ionizing radiation, Power density, Frequency spectrum, base stations.

[1] JF Viel, S Clerc, C Barrera, R Rymzhanova, M Moissonnier, M Hours, E Cardis, Residential exposure to Radiofrequency Fields from Mobile Phone Base stations, and Broadcast Transmitters: A population-Based Survey with Personal Meter, Occup Environ Med 66 (2009) 550-556.
[2] AM Martinez-Gonzalez, A Fernandez-Pascual, Practical Procedure for Verification of Compliance of Digital Mobile Radio Base Stations to Limitations of Exposure of the General Public to Electromagnetic Fields, IEEE Proceedings on Microwaves, Antennas and Propagation (USA) 149 (2002) 218-228.
[3] A Ahlbom, A Green, et al, Epidemiology of Health Effects of Radiofrequency Exposure, Environmental Health Perspectives 112(17), (2004), 1741-1754.
[4] U.S Food and Drug Administration (FDA), Radiation emitting Products: Reducing Exposure : Hands-Free Kits and Other Accessories, 2009.http://www.fda.gov/Radiation-EmittingProducts/RadiationEmittingProductsandprocedures/HomeBusinessandEntertainment/CellPhones/ucm116338.htm
[5] Nora D. Volkow, Dardo Tomasi, Gene-Jack Wang, Paul Vaska, Joanna S. Fowler, Frank Telang, Dave Alexoff, Jean Logan and Christopher Wong, Effects of Cell Phone Radiofrequency Signal Exposure on Brain Glucose Metabolism, Journal of American Medical Association, 305(8), 2011, 808-813.

ABSTRACT: The well-known problem of unidirectional plane flow of a fluid in a non-porous half-space due to the impulsive motion of the rigid plane wall it rests upon is discussed in the context of an unsteady MHD fourthgrade fluid in presence of Hall currents. The governing non-linear partial differential equations describing the problem are converted to a system of non-linear ordinary differential equations by using the similarity transformations. The complex analytical solution is found by using the homotopy analysis method (HAM). The existing literature on the topic shows that it is the first study regarding the effects of Hall current on flow of an unsteady MHD fourth-grade fluid over an impulsively moving plane wall. The convergence of the obtained complex series solutions is carefully analyzed. The effects of dimensionless parameters on the velocity are illustrated through plots and the effects of the pertinent parameters on the local skin friction coefficient at the surface of the wall are presented numerically in tabular form.
Keywords: Fourth-grade fluid, HAM, Hall currents, Stokes first problem, Unsteady.

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1851, 8-106.
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[3] V.M. Soundalgekar, Stokes problem for elastico-viscous fluid, Rheol. Acta, 13(2), 1974, 177-179.
[4] I. Teipel, The impulsive motion of a flat plate in a viscoelastic fluid, Acta Mech, 39(3-4), 1981, 277-279.
[5] P. Puri, Impulsive motion of a flat plate in a Rivlin--Ericksen fluid, Rheol. Acta, 23(4), 1984, 451-453.

ABSTRACT: Spectral depth analysis of Sokoto basin was carried out to determine the the sedimentary thickness in all parts of the basin, The total magnetic field values, obtained by digitizing the contour maps of the basin, was used to produce the composite map of the area. The Sokoto Basin is situated between latitudes 10o 30″ N to 14o 00″ N and longitude 3o30″ E to 7o 00″ E with an estimated area of 59,570 km2.Spectral depth analysis was carried out on each aeromagnetic sheet to estimate the depth to basement and infer areas of probable hydrocarbon prospects. The results of the spectral studies indicate an increase in sedimentation northwards, with several depressions on the basement rock. Two prominent magnetization layers of depths varying from 0.04 km to 0.95 km and 0.36 km to 2.88 km were observed. The areas, where higher sedimentary thicknesses are observed such as sheets No 28(Argungu), sheet no.12 (Isah) and sheet no. 13(Gandi) are the most probable sites for prospect of hydrocarbon accumulation in the basin.
Key words: Geophysical investigation; Composite map; Sedimentary thickness; Anomalies.

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ABSTRACT: Titanium dioxide thin films have been prepared from the solution of TTIP (Titanium Tetra Isopropoxide), Acetic acid and Ethanol on the glass substrates by sol-gel spin coating technique. In the present work, the TiO2 thin films have been analyzed for different coating cycles which were annealed at 450° C for one hour. The annealed films were characterized by X – Ray diffraction (XRD) method, UV – Visible & Photoluminescence (PL) spectroscopy, Field Effect Scanning Electron Microscopy (FESEM) and Energy Dispersive X – Ray Analysis (EDAX).The XRD results show that the crystallite size increases from 6.3 nm to 35.5 nm with increase in number of coating cycles. The transmittance of the film and the optical band gap are found to decrease with increase in number of coating cycles. The room temperature PL spectra of TiO2 thin films show blue and green emissions at 485 nm and 530 nm with excitation at 410 nm. The surface morphology shows rough surface with irregular particles. The stoichiometric ratio of the film was confirmed by EDAX analysis. The results of structural and optical characteristic study suggest that the sol-gel spin coated nanocrystalline TiO2 thin films can have high potential application in photo catalytic activities.
Keywords: Film thickness, FESEM, PL, Spin coating method, TiO2 thin film.

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[2] Hang Ru-bin and Gao Lian, Effect of peptizationon phase transformation of TiO2 nanoparticles, J.Mater Res Bull., 36, 2001,1957- 1965.
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[4] S.Ruan, F. Wu, T. Zhang, W.Gao, B.Xu and M. Zhao, Surface state of TiO2 nanoparticlesAnd photo catalytic degradation of methyl orange in aqueous TiO2 dispersions, Mater.chem.phys, 69, 2001, 7-9.
[5] S. Liu and X. Chen, A visible light response TiO2 photocatalyst realized by cationic S-doping and its Application for phenol degradation, J.Hazard.mater,152(1), 2008,48-55.