Barddhamān, India
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Faruk Ali Md.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
2012 National Conference on Communications, NCC 2012 | Year: 2012

In this paper, theoretical investigation has been carried out to determine the usefulness of electromagnetic wave for detection and selective destruction of bacteria colony at THz frequencies. To carry out the investigation, a realistic three dimensional electrical model of bacteria colony has been developed and placed between a pair of dipole antennas designed at THz frequencies. The model is simulated using Finite Difference in Time Domain (FDTD) based in-house numerical code developed with MATLAB. Results obtained from the simulations show that significant electromagnetic energy absorption occurs in the bacteria cell at THz frequencies near their electrical resonance frequencies. THz frequencies are also found suitable for detection of dimensions and density of bacteria cells in a colony, and selectively destroy them. © 2012 IEEE.


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Proceedings of the 2012 International Conference on Communications, Devices and Intelligent Systems, CODIS 2012 | Year: 2012

Segmented Finite Difference in Time Domain (SFDTD) method has been applied to carry out investigation at the frequency range from 500 MHz to 3.5 GHz on a pair of half wave resonant dipole antennas of each having length equal to 14.5 cm and separated by a distance of 20.0 cm placed in free space. One of the antennas is acting as a Transmitter (Tx) while the other as a Receiver (Rx). The objective of this study is to obtain scattering parameters S11 and S21 of Tx-Rx pair using SFDTD method and compared that with FDTD and IE3D methods. Comparison shows a good agreement of the results obtained by SFDTD method with that of FDTD and IE3D methods. © 2012 IEEE.


Ali Md.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
2012 National Conference on Communications, NCC 2012 | Year: 2012

Three-dimensional Finite Difference in Time Domain (FDTD) method has been used to calculate Specific Absorption Rate (SAR) induced in the head and hand for a handheld mobile phone. Both the head and hand are modeled using Digital Imaging and Communication in Medicine (DICOM) based anthropomorphic phantom voxel data considering the electrical parameters of different anatomical internal structures of the human head and hand. SAR values obtained using DICOM based voxel model are compared with that obtained using Zubal phantom based model to verify the suitability of the proposed method. The proposed method can be used for person specific real time simulation of SAR. © 2012 IEEE.


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Progress In Electromagnetics Research C | Year: 2014

Electromagnetic (EM) wave absorption characteristics for a Bonsai tree are investigated at GSM-900 band. Finite Difference in Time Domain (FDTD) method is hybridized with Friis transmission equation to carry out all the required EM simulations. The tree has been modelled using CT scan based 3D dataset considering different electrical parameters. Maximum local electric (E) field, magnetic (H) field, Specific Absorption Rate (SAR) and Shielding Effectiveness (SE) have been calculated for the tree placing at distance of 5m away from a radiating Base Station Antenna (BSA) with 20W input power. The maximum local E field, H field, 1-g SAR and SE obtained by the simulation are found to be 70.1 V/m, 0.09 A/m, 0.135 W/kg and 13.18 dB, respectively. Plants are found to be good natural electromagnetic radiation shield.


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Egyptian Journal of Radiology and Nuclear Medicine | Year: 2015

In this paper, steady state temperature variations in the human brain due to different electrical and physical changes have been studied considering different thermal ablation treatment requirements using RF probe. Initially, a subject specific voxel-based electrical model has been constructed from Digital Imaging and Communication in Medicine (DICOM) formatted Computed Tomography (CT) or Magnetic Resonance (MR) based image stacks with different pixel characteristics using the Hounsfield unit extraction technique. This subject specific electrical model that consists of different dielectric constant and conductivity, considering different anatomical organs and tissues is simulated using commercially available finite integral technique (FIT) based EM simulation software CST Microwave Studio®. This study clearly shows the possibility of subject specific precise offline microwave thermal ablation treatment planning. © 2014 The Egyptian Society of Radiology and Nuclear Medicine. Production and hosting by Elsevier B.V. All rights reserved.


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Progress In Electromagnetics Research M | Year: 2014

Electromagnetic wave absorption inside a human body is investigated. The human body has been modeled using 3D voxel based dataset considering different electrical parameters. At GSM 900 band, Specific Absorption Rate (SAR) induced inside the human body model exposed to a radiating base station antenna (BSA) has been calculated for multiple number of carrier frequencies and input power of 20 W/carrier. Distance (R) of human body from BSA is varied in the range of 0.5m to 5.0 m. Values of whole-body average SAR obtained by hybrid FDTD method closely match with that obtained by SFDTD method. For number of carrier frequency equal to five and R = 0:5 m, maximum value of whole-body average SAR obtained by both hybrid FDTD and SFDTD method is found to be 0.69 W/kg which decreases either with increase of R or decrease of number of carrier frequencies. Safety distance for general public is found to be 1.5m for number of carrier frequencies equal to five. Summary of performance comparison shows that hybrid FDTD method is faster and requires less memory than SFDTD method. © 2014, Electromagnetics Academy. All rights reserved.


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Journal of Microwaves, Optoelectronics and Electromagnetic Applications | Year: 2013

In this paper, Specific Absorption Rates (SAR) inside the human head and hand have been analyzed for a handheld mobile phone operated at GSM 900 band. Both the head and hand are modeled electrically using Digital Imaging and Communication in Medicine (DICOM) formatted CT Scan voxel data considering the electrical parameters of different internal anatomical structures. Three-dimensional Finite Difference in Time Domain (FDTD) method has been used to simulate SAR induced in the head and hand. Maximum peak 1-g and 10-g SARs of 1.33 W/kg and 0.388 W/kg are found at antenna resonance frequency of 930 MHz for 0.6 W applied input power which are below the limits set by ANSI/IEEE and FCC, respectively. © 2013 SBMO/SBMag.


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Progress In Electromagnetics Research M | Year: 2014

Investigations have been carried out on the convex lens effect of non-ionizing radiation inside the abdomen of a pregnant woman. Focusing property for a plano-convex lens, which is thicker than twice of its focal length and filled with water, is studied for electric and magnetic fields at different microwave frequencies. It is observed that real image of electromagnetic fields are formed inside the lens itself at the focal plane when a microwave source is placed at a distance much greater than the twice the focal length. A three dimensional homogeneous electrical model of pregnant woman abdomen model behaves like plano-convex lens and creates real image of the microwave source inside the abdomen.


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
CODEC 2012 - 5th International Conference on Computers and Devices for Communication | Year: 2012

Using Segmented Finite Difference in Time Domain (SFDTD) method, Specific Absorption Rate (SAR) induced inside a three layered spherical human head model exposed to a 100 W Base Station Antenna (BSA) at GSM900 band has been calculated. Maximum local 1-g SAR has been calculated at the frequency range of 650 MHz to 1350 MHz, keeping distance between head and BSA equal to 1.0 m. The human head is modelled as an inhomogeneous sphere of diameter 21.0 cm. The objective of this study is to estimate maximum local 1-g SAR induced in the human head model exposed to BSA using SFDTD method and compared that with proposed hybrid FDTD method. © 2012 IEEE.


Ali M.F.,Nazrul Centenary Polytechnic | Ray S.,Jadavpur University
Indian Journal of Radio and Space Physics | Year: 2014

Specific absorption rate (SAR) induced inside human head in the near-field of a mobile phone antenna has been investigated for three different SAR resolutions using Finite Difference in Time Domain (FDTD) method at GSM 900 band. Voxel based anthropomorphic human head model, consisting of different anatomical tissues, is used to calculate the peak SAR values averaged over 10-g, 1-g and 0.1-g mass. It is observed that the maximum local SAR increases significantly for smaller mass averages.

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