Materials Literature
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We use a hybrid strategy to obtain anharmonic frequency shifts and lifetimes of phonon quasi-particles from first principles molecular dynamics simulations in modest size supercells. This approach is effective irrespective of crystal structure complexity and facilitates calculation of full anharmonic phonon dispersion…
One of the important characteristics of solid-state phase transformations in steels is the choreography of atoms as they traverse the frontier between the parent and the product phases. Some transformations involve a chaotic motion of atoms consistent with long-range diffusion, and hence are closer to equilibrium than…
final report
The self-consistent equations for MI phase transition are formulated. We\nassume two order parameters which describe the phase transition. The first one\nis the density distribution at MI boundary $\\rho (\\vec r)$. The second one is a\ntwo component complex vector in spin space $\\Psi (\\vec r)$. It determines\nelect…
Desarrollo de una Metodologia de Biolixiviacion In Situ para la Purificacion de Arenas de Silice que Pueda Ser Utilizado como Proceso Complementario a los Sistemas de Depuracion Tradicionalmente Empleados en Cristalerias de Chile.
Block diagram of the active harmonic filter is considered. State table inverter power switches active harmonic filter is considered. Calculated the capacitance on the DC link active harmonic filters. The calculation takes into account the power converter losses in the active harmonic filter.
Mester v. 42
Some uncertainties are discussed on the high-temperature phase boundaries and critical point parameters for gas-liquid phase transition in silica (SiO2). The thermal and caloric phase diagrams are compared and examined as being predicted by various theoretical approaches, such as the quasi-chemical representation, the…
This is a revised version of a manuscript that was originally posted here in February of 2014. It has been accepted at the journal Inorganic Chemistry after reviews that included those of two crystallographers who made sure all the t's were crossed and the i's were dotted. The old work (from 1968) that said that Cd3As…
The removal of the bulk liquor surrounding the pulp fibers using less concentrated liquor is known as pulp washing. In the present study, a pulp washing model involving diffusion-dispersion through packed beds of finite length is presented. Separation of variables is applied to solve system of governing partial differ…
El acero ferrítico 2.25Cr-1Mo es comúnmente utilizado para la fabricación de tubos de supercalentadores para calderas industriales, puesto que presenta buenas propiedades mecánicas a alta temperatura. Sin embargo, las cenizas producidas por el combustible quemado se depositan sobre su superficie causando corrosión en…
En el presente trabajo se evaluó la corrosión de tres tipos de aceros, preoxidados y sin preoxidar, en presencia de sulfato de sodio reactivo, empleando técnicas electroquímicas, como resistencia a la polarización, pendientes Tafel e impedancia electroquímica, y técnicas gravimétricas, como ganancia de peso a temperat…
The Lepidigathis cristata Wlld belong to the family of Acanthecae. In the present study the Anti-inflammatory activity of flower extracts were performed. The methanol, ethyl acetate, chloroform extracts were prepared by soxhlet extraction method and were used for Anti-inflammatory activity in two dose level that is 20…
En el presente artículo se muestra una serie de posibilidades de fabricación con el polietileno aluminio obtenido del proceso de reciclaje de envases multicapas de Tetra Pak, los cuales comenzaron a desarrollarse desde el año 2007, en conjunto con la empresa Innopac k de Cali y el Grupo de Investigación en Tecnologías…
This paper presents the correlation of impact energy obtained from the laboratory test as well as the calculated energy using the power spectrum density (PSD) method. Based on a previous study, the total absorbed energy obtained using the dial/encoder system may be significantly different, depending on the strength an…
SiO2/Silicalite-1 core-shell material has been demonstrated as potential shape selective adsorbent in gas phase separation of p-xylene from a mixture of p/o-xylene isomers. The core-shell composite comprised of large silica core and thin polycrystalline silicalite-1 shell which was synthesized via a self-assembly of s…
The homogeneous nanocomposites (NC) films of amino modified and metal decorated multiwall carbon nanotubes (MWCNTs) with polymethylmethacrylate (PMMA) were synthesized through in‐situ free radical polymerization. Silver metal nanohybrids (Ag/MWCNTs) were prepared by two strategies, that is, reduction of metal salt in…
We synthesized ternary n-type bismuth tellurium selenide nanomaterials for thermoelectric applications via a water-based chemical reaction under an atmospheric environment. In this work, bismuth nitrate was employed as a bismuth precursor and was hydrolyzed to form bismuth hydroxide in an aqueous solution. Ascorbic ac…
In this study, poly(vinyl alcohol) (PVA) films doped with thorium nitrate hydrate [Th(NO3)4] have been prepared using casting technique. The optical absorption spectra were recorded at room temperature in the wavelength range 200–800 nm. From the absorption edge studies, the values of the Urbach energy (Eu) have been…
The use of copper polyamine complexes as structure directing agents for microporous solids offers a direct route to the inclusion of Cu 2+ complex cations in their pores: upon calcination, this gives active catalysts for the selective catalytic reduction of NO with NH 3 . In situ synchrotron IR absorption spectroscopy…