About Dirac-Type Equations in an A-Temporal Quantum-Gravity Space Theory

-- Davide Fiscaletti

According to an a-temporal quantum-gravity space theory recently suggested, the gravitational space turns out to have a wave and granular nature, and its properties derive from two fundamental physical quantities: the density of cosmic space (intended as the physical quantity which is linked with the amount of matter present in the region under consideration), and a quantum number indicating a sort of ‘rotation-orientation’ of each point of the gravitational space. In the mathematical formalism of this approach, which is based on a generalized Klein-Gordon equation and a generalized Fiscaletti-Dirac equation for the density of cosmic space, important results as regards the curvature and granular structure of space can be obtained. Moreover, the generalized Fiscaletti-Dirac equation for the density of cosmic space suggests a new interesting key of reading of the Klein paradox. In the second part of this paper, a generalized Fiscaletti-Dirac equation for the density of cosmic space with electromagnetic interaction is introduced and its perspectives in the treatment of the curvature of space are analyzed.

© 2011 IUP. All Rights Reserved.

Study of Energy Spectrum and Wave Function of Hydrogen Molecule Ion

--M R Pahlavani and H Rahbar

The exact solution of the schrödinger equation for a two-dimensional Hydrogen molecule ion is obtained using prolate spheroidal coordinate system. The resultant modified differential equations have been compared with standard Jacobi and Laguerre differential equations in order to obtain ground state energy and eigen state of this simplest molecule ion. Also, it is shown that the related two-dimensional differential equation is well separated into two one-dimensional equations that are solvable.

© 2011 IUP. All Rights Reserved.

Characterization of Lead Poisoning Gold Ores from North Western Nigeria Using PIXE Technique

-- Bello Abdullahi and I I Funtua

Proton induced x-Ray emission (PIXE) was utilized to characterize Lead (Pb) and other elements in gold ores from North Western Nigeria. This research work was occasioned by the recent Pb poisoning in some parts of Nigeria. Fourteen samples were collected, prepared to a scale interrogated by this technique, then analyzed at the Centre for Energy Research and Development (CERD)’s accelerator, Ile-Ife, Nigeria. After activation, the spectrums generated from the samples revealed that lead concentration ranged several thousand times above the norm (6.60 ppm) in the gold ores.

© 2011 IUP. All Rights Reserved.

A Comparison Study of Chemical Solution Deposited (100)-Epitaxial Nd0.7Ca0.3MnO3 and Nd0.7Sr0.3MnO3 Nanocrystalline Thin Films at 800 °C

--Pooja A Chhelavda, Jessica R Chocha and J A Bhalodia

This paper reports a study of the magnetotransport and electrical properties of (100)-oriented Nd0.7(Sr, Ca)0.3MnO3 thin films prepared by an optimized chemical solution deposition process on a (100) LaAlO3 single-crystal substrate. The films were studied by X-Ray Diffraction (XRD), atomic force microscopy, magnetotransport data and four-point-probe electrical measurements. A characteristic nanocrystalline texture with ~22-25 nm crystallites was observed in both the films. The magnetotransport properties were determined as a function of the temperature and applied magnetic field. Both films display large values of colossal magnetoresistance at around room temperature. However, the dependence of these promising properties on the nanocrystal size remains to be explored.

© 2011 IUP. All Rights Reserved.

FTIR, DSC, and Optical Studies of PVA Doped with GdF3 Solid Polymeric Films

--S Mohan Reddy, CH Ramesh, M Jaipal Reddy and K Narasimha Reddy

Solid polymer Poly (vinyl alcohol) (PVA) blend with Gadolinium Fluoride (GdF3) films were prepared by means of solution-cast procedure. Differential Scanning Calorimetry (DSC), Fourier Transform Infrared (FTIR) spectroscopy and optical absorption techniques were carried out on this PVA-GdF3 complexed system for characterization of complex formation and to evaluate optical band gap. Glass transition temperature (Tg) of PVA was found to be 88 °C. Addition of GdF3 to PVA showed an increase in Tg. A comparison of FTIR spectra of pure PVA with PVA complexed films showed several changes in band position along with disappearance of some bands and appearance of new bands. Band position changes at -OH group were dramatic, which indicated the interaction of Gd+3 with OH of PVA polymer in complexed films. Optical properties such as cut-off wavelength (lc) and optical band gap (Eopt) were determined for PVA-GdF3 polymer complexed films with the help of optical absorption spectra. The DC electrical conductivity of PVA was found to be 10–10, and this value increased to 10–6 by the addition of GdF3.

© 2011 IUP. All Rights Reserved.