Jayasree, V K; Dr. Radhakrishnan, P(Cochin University of Science and Technology, January , 2009)
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Abstract:
Photoplethysmography (PPG) is a simple and inexpensive optical
technique that can be used to detect blood volume changes in the
microvascular bed of tissues. There has been a resurgence of
interest in the technique in recent years, driven by the demand for low
cost, simple and portable technology for the primary care and
community based clinical settings and the wide availability of low cost
and small semiconductor components, and the advancement of
computer-based pulse wave analysis techniques. The present research work deals with the design of a PPG sensor for recording the
blood volume pulse signals and carry out selected cardiovascular studies based
on these signals. The interaction of light with tissue, early and recent history of PPG,
instrumentation, measurement protocol and pulse wave analysis are also discussed in this study. The effect of aging, mild cold exposure, and variation in the body posture on the PPG
signal have been experimentally studied.
Description:
International School of Photonics, Cochin University of Science and Technology
The heterogeneous photocatalytic degradation of methylorange over TiO2 is studied
and is found to be cost effective. Effect of Zirconium metal incorporation over titania system is investigated. Photocatalytic degradation of methylorange using solar radiation is
found to be highly economical when compared with the processes using artificial UV
radiation, which require substantial electrical power input. The characterization of titania as
well as modified zirconium metal doped titania systems are done using XRD, FTIR and
EDAX measurements. The catalytic activities of different systems are also compared and is
tried to correlate with the crystallite size and presence of dopant metal.
George, K E; Jacob, Sinto; Suma, K K; Mendaz, Jude Martin; George, Abhilash(Wiley InterScience, 2009)
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Abstract:
Poly(propylene) (PP) reinforced with short glass fiber was modified with
precipitated nanosilica (pnS) by melt mixing. The weight of the glass fiber was varied
by keeping the pnS at optimum level. The properties of the composites were studied
using universal testing machine, dynamic mechanic analyser (DMA), differential
Scanning calorimetry (DSC) and thermo gravimetric analyser (TGA). The amount of the
glass fiber required for a particular modulus could be reduced by the addition of
nanosilica.