Lanczos Spintensor
for Several Spacetimes
-- I Guerrero-Moreno, López-Bonilla and A Rangel-Merino
Here we employ the Newman-Penrose formalism to obtain the Lanczos potential for some metrics of interest in
general relativity.
© 2009 IUP. All Rights Reserved.
Comparative Analysis
of Cascode Operational Transconductance Amplifiers for HF Switched-Capacitor Filters
-- Sandeep K Arya and Rekha Kansal
The main specifications of amplifiers required for
High Frequency Switched-Capacitor (HF SC) filter are high gain,
fast response and good accuracy. Different cascode Operational Transconductance Amplifier (OTA) topologies have been
presented and compared in this paper. The amplifier structures have been
analyzed in terms of their Alternating current
(AC), Direct Current (DC) and transient performance parameters using
T-Spice simulations. The multipath amplifier with enhanced
gain, approximately one and half times unity Gain
Band Width (GBW) as that of Current-Mirror Cascode (CMC) amplifier and
more than 30% improvement in slew-rate values with respect to
Folded Cascode (FC) amplifier has been presented in this paper.
© 2009 IUP. All Rights Reserved.
Dielectric Characterization of the Blend, Natural Rubber with Nitrile Butadiene Rubber
-- S Gunasekaran, A Kala and R K Natarajan
The effect of temperature on the dielectric properties of the newly blended rubber material Natural Rubber (NR) with
Nitrile Butadiene Rubber (NBR) at 80:20 concentrations was investigated. The dielectric constant and dielectric loss were
carried out into two ways, i.e., the temperature dependences and frequency dependences. Low frequency range
measurements were conducted with the impedance spectrometer and high frequencies used microwave bench system X and K band.
The temperature dependence of dielectric behavior is constancy between the frequency ranges 1584.9 HZ and 5.01E6 Hz
but the dielectric constant decreases as frequency increases from 1 HZ to 1E7 HZ and 9 GHZ to 26 GHZ at room
temperature. It was concluded that mechanical blending of the two rubber materials is the simplest mean to obtain a variety of physical properties from the constituent rubber materials NR and NBR.
© 2009 IUP. All Rights Reserved.
Study of Activation Energy From Thermogravimetric Analysis
(Tga)
for Barium Tartrate
(BaC4H4O6)
Crystals Grown by Gel Method
-- Atul Shah, I B Patel and Sunil Chaki
Tartrates have a well-known property of ferro electricity and other broad applications. Barium tartrate crystals have
been successfully grown by gel method at ambient temperature in normal test tube. Thermal stability and kinetic parameters
of these crystals were studied by employing Thermogravimetric Analysis (TGA). The TGA graph shows that the crystals
are stable up to 220 °C temperature. Decomposition takes place in four stages. Activation energy and frequency factor
for decomposition have been calculated using non-mechanistic equations.
© 2009 IUP. All Rights Reserved.
An Introduction to the Neutrosophic Probability Applied to Quantum
Physics: Revisited
-- Florentin Smarandache
This paper generalizes `classical probability' and `imprecise probability' to the notion of `neutrosophic probability' in
order to model Heisenberg's Uncertainty Principle of a particle's behavior, Schrödinger's Cat Theory, and the state of
bosons which do not obey Pauli's Exclusion Principle (in quantum physics). Neutrosophic probability is closely related to
neutrosophic logic and neutrosophic set, and is etymologically derived from `neutrosophy'.
© 2009 IUP. All Rights Reserved.
RESEARCH NOTE
On the Lorentz Transformations
-- M Hernández-González, J López-Bonilla and
A Rangel-Merino
We show expressions, in terms of Pauli matrices, which directly generate
Lorentz transformations in special relativity.
© 2009 IUP. All Rights Reserved.
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