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1

Quiet Zone for the patient in an Ambulance : Active Noise Control Technology for Siren Noise Reduction

Sharma M. K., Vig R., Pal R., Shantharam V.

Archives of Acoustics

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2018

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Vol. 43, No. 2

275--281

EN

This paper proposes an active noise control (ANC) application to attenuate siren noise for the patient lying inside ambulance with no sound proofing. From the point of cost effectiveness, a local ANC system based on feedforward scheme is considered. Further, to handle the limitation of limited Zone of Silence (ZoS), the ANC based on virtual sensing is explored. The simulations are done in MATLAB for the recorded ambulance siren noise signal. The results indicate that ANC can be an effective solution for creating a silent environment for the patient.

2

Overview of etching technologies used for HgCdTe

Srivastav V., Pal R., Vyas H. P.

Opto-Electronics Review

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2005

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Vol. 13, No. 3

197-211

EN

This review is an attempt to survey all the etching techniques that have been used since the very beginning stages of HgCdTe device fabrication to the most recent ones. Recent state of the art device architectures such as high-density focal plane arrays, avalanche photodiodes, two-colour and multispectral detectors require isolation of high aspect ratio trenches with least etch induced damage at the surface and sidewalls. The most widely used dry etching techniques are electron cyclotron resonance plasma and inductively coupled plasma processing. Almost all the etching technologies have been summarized from chemistry and device perspective.

3

The rheology of concentrated dispersions of oil and water with and without slippage

Pal R.

Applied Mechanics and Engineering

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1999

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Vol. 4, no spec.

369-374

EN

The rheological properties (yield stress, storage modulus) of a series of high internal phase ratio oil-in-water emulsions were investigated using a controlled-stress rheometer. The volume fraction of the dispersed phase ranged from 0.7124 to 0.8961. The yield stress for any given emulsion was determined from three different experiments: steady shear, oscillatory shear, and creep/recovery experiments. The yield stress values obtained from different experiments show good agreement with each other. Both yield stress and storage modulus of the emulsions increase with the increase in the dispersed phase concentration. The Princen and Kiss equations are used to interpret the yield stress and storage modulus data of this study.

4

Flow properties of high internal phase ratio oil-in-water emulsions

Pal R.

Applied Mechanics and Engineering

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1999

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Vol. 4, no spec.

363-368

EN

The rheological properties (yield stress, storage modulus) of a series of high internal phase ratio oil-in-water emulsions were investigated using a controlled-stress rheometer. The volume fraction of the dispersed phase ranged from 0.7124 to 0.8961. The yield stress for any given emulsion was determined from three different experiments: steady shear, oscillatory shear, and creep/recovery experiments. The yield stress values obtained from different experiments show good agreement with each other. Both yield stress and storage modulus of the emulsions increase with the increase in the dispersed phase concentration. The Princen and Kiss equations are used to interpret the yield stress and storage modulus data of this study.