The Weyl-Lanczos relations are systems in consonance with the spacetime variables. Lanczos showed that in an arbitrary spacetime there exists a potential (kabx) not unique to the Weyl tensor. In the first paper, “Lanczos Spintensor for Several Spacetimes”, the authors I Guerrero-Moreno, J López Bonilla and A Rangel-Merino, employed the Newman-Penrose formalism to obtain the Lanczos potential for well-known spacetimes of general relativity. The treatment for analysis is tensorial and makes use of the Weyl-Lanczos equations. Relationship is derived between the components of Lanczos spintensor and rotation coefficients.

High frequency switched-capacitor applications require amplifiers with fast settling response times. In the second paper, “Comparative Analysis of Cascode Operational Transconductance Amplifiers for HF Switched-Capacitor Filters”, Sandeep K Arya and Rekha Kansal, present a comparison of cascade Operational Transconductance Amplifiers (OTA) topologies for high speed applications using T-Spice simulations. A multipath OTA with enhanced performance parameters has been presented.

Rubber is extensively used in many applications because of its unique performance and specific properties like energy absorption, damping and long service life at ambient temperature. The blending of different rubber materials finds wide applications as insulating material in electrical appliances. In the third paper, “Dielectric Characterization of the Blend, Natural Rubber with Nitrile Butadiene Rubber”, S Gunasekaran, A Kala and R K Natarajan, investigated the effects of temperature on the dielectric properties of the newly blended rubber material, natural rubber with nitrile butadiene at 80:20 concentrations.

The crystals are grown using gel method to achieve perfection and uniformity. In tartrates, the conduction mechanism occurs not only through electron transport but also through proton displacement. Due to this, they exhibit ferroelectric and nonlinear optical characteristics.

In the fourth paper, “Study of Activation Energy from Thermogravimetric Analysis (TGA) for Barium Tartrate (BaC4H4O6) Crystals Grown by Gel Method”, the authors Atul Shah, I B Patel and Sunil Chaki, have presented their findings on Barium Tartrate crystals grown using gel method at ambient temperature. Thermal stability and kinetic parameters of these crystals were studied using TGA. Activation energy and frequency factor were calculated.

Neutrosophic probability is useful to those events which involve some degree of indeterminacy (unknown). This kind of probability is necessary because it provides a better approach than the classical probability to uncertain events. In the fifth paper, “An Introduction o the Neutrosophic Probability Applied to Quantum Physics: Revisited”, Florentin Smarandache generalized the classical and imprecise probability to the notion of neutrosophic probability in order to model Heisenberg’s uncertainty principle of particle behavior. The paper also shows how neutrosophic probability provides a better representation than classical probability to uncertain events.

In their research note, “On the Lorentz Transformations”, M Hernández-González, J López Bonilla and A Rangel-Merino have presented direct expressions to generate Lorentz transformations in special relativity using the Pauli matrices.

-- BVVSN Prabhakara Rao
Consulting Editor