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[3] viXra:1707.0183 [pdf] submitted on 2017-07-13 07:24:00
Authors: Mahendra Kumar Trivedi
Comments: 8 Pages.
Sodium selenate is an important inorganic compound but lacks reliable and accurate physico-chemical and spectral characterization information. The study was carried out for the in-depth physicochemical, thermal, and spectroscopic characterization of sodium selenate using various analytical techniques. The powder X-ray diffraction spectroscopy analysis showed well-defined and sharp peaks indicated sodium selenate is crystalline in nature. The crystallite size was found to be in the range of 28.75 to 49.97 nm. The average particle size was found to be of 3.93 (d10), 14.44 (d50), and 40.648 (d90) µm with an average surface area of 0.676 m2/g. The differential scanning calorimetry showed the endothermic inflation at 588.81 °C with the latent heat of fusion 103 J/g. The thermogravimetric analysis revealed two steps of the thermal degradation process. Similarly, the differential thermogravimetric analysis exhibited the major peaks in the thermogram and disclosed Tmax at 852.65 °C. The UV-visible spectrum showed maximum absorbance at 205.1 nm (λmax). The Fourier transform infrared spectrum showed a peak at 888 cm-1 due to the Se-O stretching. This information would be very much useful in the field of nutraceuticals/ pharmaceuticals and other industries using sodium selenate as an ingredient.
Category: Chemistry
[2] viXra:1707.0008 [pdf] submitted on 2017-07-01 08:25:08
Authors: John Atwell Moody
Comments: Pages.
Contents
Part I
O(j) is not fully equivariant if j is odd
Representations of SO3
Eigenfunctions of the Laplacian
Attempts to explain the periodic table
Attempts to explain atomic spectra
Part II
Three corrections to the fine structure
A discussion of perturbation theory
Half-integer values of l – first explanation
Generalities about the Hamiltonian formulation
Schroedinger’s function W
Half-integer values of l – other explanations
The atom
Schroedinger’s choice of solutions
Residues
The canonical divisor and j quantum number
Intuitive description of polarization
Relation between smooth and holomorphic Laplacian operators
A coincidence about the periodic table
Linear systems of wave forms
Hodge theory
The Levi-Civita action is not Lagrangian for its Riemann metric
Foundations
Unification of the various coupling schemes
Discussion of the problem of non-convergent integrals
The ethics of science
First concepts of the Lamb shift
A question about Pauli exclusion
The notion of probability
Concluding remark
False fine structure
Electron spin and Pauli exclusion
It was not the right conclusion
Category: Chemistry
[1] viXra:1707.0001 [pdf] submitted on 2017-07-01 04:51:48
Authors: Antenor Neto, Vitaly V. Chaban, Eudes E. Fileti
Comments: 18 Pages.
Hydration of graphene oxide (GO) is an important process for most of areas planning to use it in practical applications. This process is described in this work by molecular dynamics atomistic simulations for seven different models for GO at different levels of oxygenation. Two charge models for GO were considered: a simplified one, where sp2 carbons were treated as LJ uncharged sites and another with charges at all sites obtained by the CHELPG scheme. We observed that the structural properties suffer little or no effect in relation to the charge model, on the other hand the energetics is much more sensitive. Our model employing CHELPG charges shows that the simplified model tends to overestimate the GO/water interaction energy. For all of the investigated systems, hydration free energy values are in the range of -5 to -45 kJ mol-1 indicating that hydration is a favorable process for all investigated systems. The results presented here is relevant in the context of several applications, such as the use of GOs as electrodes in supercapacitors or inhibitors in processes involving biological molecules.
Category: Chemistry
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