NOPR Collection:http://nopr.niscpr.res.in/handle/123456789/127292026-10-10T23:52:50Z2026-10-10T23:52:50ZVoltage-mode multifunctional biquadratic filter using single DVCC and minimum number of passive elementsTangsrirat, WorapongChannumsin, Orapinhttp://nopr.niscpr.res.in/handle/123456789/127562016-07-20T04:29:26Z2011-10-01T00:00:00ZTitle: Voltage-mode multifunctional biquadratic filter using single DVCC and minimum number of passive elements
Authors: Tangsrirat, Worapong; Channumsin, Orapin
Abstract: A voltage-mode multifunctional biquadratic filter with three input
terminals and single output terminal is presented. The proposed circuit is
constructed using only one differential voltage current conveyor (DVCC) as active element and minimum number of passive
elements, namely two resistors and two capacitors. The circuit can
simultaneously realize all five different biquadratic filtering lowpass, bandpass, highpass, bandstop and
allpass responses from the same configuration. The non-ideal effects of the
presented filter are examined. PSPICE simulations of the proposed circuit are
included using 0.35-mm CMOS technology from
TSMC.
Page(s): 703-7072011-10-01T00:00:00ZHot-pressed nano-composite polymer electrolytes: (1-<i style="">x</i>) [70PEO:30KBrO<sub>3</sub>]:<i style="">x</i>SiO<sub>2</sub>Chandra, AngeshChandra, ArchanaThakur, S Shttp://nopr.niscpr.res.in/handle/123456789/127552016-07-20T04:28:11Z2011-10-01T00:00:00ZTitle: Hot-pressed nano-composite polymer electrolytes: (1-<i style="">x</i>) [70PEO:30KBrO<sub>3</sub>]:<i style="">x</i>SiO<sub>2</sub>
Authors: Chandra, Angesh; Chandra, Archana; Thakur, S S
Abstract: The electrical and
electrochemical properties of PEO-based hot-pressed nano-composite polymer
electrolyte (NCPE) membranes: (1-<i>x</i>) [70PEO:30KBrO<sub>3</sub>]:<i>x</i>SiO<sub>2</sub>,
where <i>x</i> = 0-20 wt. (%), have been studied. NCPE membranes have been
casted using a novel hot-press technique in place of the traditional solution
cast method. The conventional Solid Polymer Electrolyte (SPE) composition:
(70PEO: 30KBrO<sub>3</sub>), identified as the highest conducting film at room
temperature, has been used as I<sup>st</sup>-phase host matrix and nano-size
(~8 nm) particles of SiO<sub>2</sub> as II<sup>nd</sup>-phase dispersoid. As a
consequence of dispersal of SiO<sub>2 </sub>in SPE host, a conductivity
enhancement of an order of magnitude was achieved in NCPE film: [95(70PEO:30KBrO<sub>3</sub>):5SiO<sub>2</sub>].
This composition has been referred to as Optimum Conducting Composition (OCC).
Materials characterization has been done with the help of SEM and DSC
techniques. The ion transport behaviour in NCPE membranes have been discussed
on the basis of conductivity (σ), mobility (µ), mobile ion concentration (n)
and ionic transference number (<i style="">t</i><sub>ion</sub>)
studies. The temperature dependent conductivity studies have also been done to
compute the activation energy (<i style="">E</i><sub>a</sub>)
values by least square linear fitting of ‘logσ-1/<i style="">T</i>’ Arrhenius plots. Thin
film solid-state polymeric batteries were fabricated using NCPE OCC as
electrolyte and the cell-potential discharge characteristics were studied under
different load conditions.
Page(s): 698-7022011-10-01T00:00:00ZFirst principles study of electronic, elastic and lattice dynamical properties of Mg<sub>2</sub>X (X= Si, Ge and Sn) compoundsPandit, PremlataSanyal, Sankar Phttp://nopr.niscpr.res.in/handle/123456789/127542016-07-20T04:28:47Z2011-10-01T00:00:00ZTitle: First principles study of electronic, elastic and lattice dynamical properties of Mg<sub>2</sub>X (X= Si, Ge and Sn) compounds
Authors: Pandit, Premlata; Sanyal, Sankar P
Abstract: First principles pseudopotential method based on density functional theory
is used to investigate the structural, electronic, elastic and phonon
properties of Mg<sub>2</sub>X (X=Si, Ge, Sn) compounds at ambient pressure in
antifluorite (anti-CaF<sub>2</sub>-type) structure. The calculated lattice
parameters, static bulk modulus, its first order pressure derivatives and the
elastic constants are compared with available experimental and other
theoretical results. All the compounds have shown very small indirect band gap.
The linear response method is applied to determine the phonon dispersion
relations and phonon density of states. The phonon frequencies of these
compounds are compared with Raman frequency to reveal small LO-TO splitting at
zone center.
Page(s): 692-6972011-10-01T00:00:00ZMicrowave absorption in antiferroelectric tin chloride dihydrate crystalUpadhyay, Trilok ChandraKumar, Pramodhttp://nopr.niscpr.res.in/handle/123456789/127532016-07-20T04:28:10Z2011-10-01T00:00:00ZTitle: Microwave absorption in antiferroelectric tin chloride dihydrate crystal
Authors: Upadhyay, Trilok Chandra; Kumar, Pramod
Abstract: Two-sublattice pseudospin lattice coupled mode
model of Mitsui [<i style="">Phys Rev, </i>111 (1958)
1259] is modified by adding along with third-and-fourth order phonon anharmonic
interaction terms for SnCl<sub>2</sub>·2H<sub>2</sub>O crystal. With the
help of double-time thermal Green's function method, expressions for shift,
width, renormalized AFE soft mode frequency, Curie temperature, dielectric
constant and microwave absorption are obtained for tin chloride dihydrate
crystal. By fitting model values of physical quantities, temperature dependence
of AFE soft frequency, dielectric constant and microwave absorption have been
calculated for tin chloride dihydrate crystal. Theoretical results are compared
with experimental results of Mognaschi <i>et al.</i> [<i style="">Phys Rev</i>, B14 (1976) 2005].
Page(s): 686-6912011-10-01T00:00:00Z