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International Journal of Advanced Scientific Engineering and Technological Research

[5 followers] Follow
This is an Open Access Journal

Open Access journal
ISSN (Print) 1839-7239 - ISSN (Online) 1839-7239
Published by SETScholars

[5 journals]

Design and Simulation of Micro Resistor Beam using COMSOL
- Authors: Srinivasa Rao Karumuri
  Abstract: This paper demonstrates about the design and analysis of micro resistor beam using COMSOL MultiPhysics software V 4.1. The current passing through the beam dissipates heat energy due to its resistivity that displaces the entire micro beam to desired distance through thermal expansion phenomenon. The proposed model analyses mainly the various displacements produced for the beam due to passage of currents and rise in temperature. It also reports the displacements produced in the beam, made of different metallic materials and for different input potentials.
  PubDate: 2013-05-25
  Issue No: Vol. 2 (2013)
Evaluation of Different Interpolation Techniques for Estimating Soil Radon Gas – A Case Study in An Olive Farm Soil in Rende, Italy
- Authors: Riazuddin Kawsar
  Abstract: Radon is a natural gas known to be the main contributor to natural background radiation exposure and second to smoking, a major leading cause of lung cancer. The main source of radon is the breakdown of uranium in the soil. Monitoring surveys have been promoted in many countries in order to assess the exposure of people to radon. In this paper, radon concentration in an olive farm soil was examined using five different interpolation techniques (IDW, Simple Kriging, Ordinary Kriging, Simple CoKriging and Ordinary CoKriging). Two approaches were considered. Firstly, all measured radon dataset were used for evaluation of the interpolation methods. Secondly, the similar procedure was applied with extreme values being removed from radon dataset as a way to see whether or not their removal had great impact on the prediction results. For CoKriging interpolation in both approaches, Potassium was used the secondary variable. Despite no single interpolation technique is considered superior to the other in this particular study, the comparison based on the Root-Mean-Square-Error (RSME) alone concludes that Simple CoKriging performs better than all the other interpolation techniques. Additionally, the ratio of variances between the predicted and observed radon gas show less variability in the prediction results.
  PubDate: 2013-05-25
  Issue No: Vol. 2 (2013)