Materials Literature
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O principal programa de pesquisa do Grupo de Diagrama de Fases e Termodinâmica Computacional do DEMAR/EEL-USP é o estudo de estabilidade de fases em ligas dos sistemas Me-Si-B (Me = Metal Refratário), os quais apresentam um interesse crescente na área de ligas com potencial para aplicações em altas temperaturas. Deste…
Purpose: Titanium alloys are commonly used for prosthetic abutments fabrication, but these alloys present high cost and difficult handling. Alternative Ni-Cr alloys with Mo and Ti combination have been proposed. This study compared the alloys Ti-6Al-4V and Ni-Cr-Ti-Mo by analyzing their surface properties such as hard…
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We have examined the impact of charged impurity scattering on charge carrier transport in bilayer graphene (BLG) by deposition of potassium in ultra-high vacuum at low temperature. Charged impurity scattering gives a conductivity which is supra-linear in carrier density, with a magnitude similar to single-layer graphe…
A tunnel magnetic junction is considered with magnetic hard and magnetic soft layers of cubic symmetry. The magnetic switching is analyzed of the layers by a magnetic field perpendicular to the initial magnetizations. In such a situation, an additional peak of the TMR ratio appears at the magnetic field value lower su…
We investigate the electron spin resonance of an ensemble of Nitrogen-Vacancy (NV) color centers in a bulk diamond crystal. The four possible orientations of the NV-center in the lattice lead to different dependences on the magnitude and the orientation of an external static magnetic field. Experimental results obtain…
Abstract : The goal of this proposed work was to develop engineered nanostructures that could have extremely hard properties but yet adequate toughness approaching 20 MPa-m1/2 to prevent fracture. In the first year (2008-2009) of this work, understanding of both the necessary and limiting factors have been developed.…
Fundo Mackenzie de Pesquisa
A larga escala de produção de plásticos elevou-se para 200 milhões de toneladas no mundo, no ano de 2005. Isso representa um aumento considerável na produções anuais de 9,9%, desde 1950. Uma parte considerável destes polímeros sintéticos, 36% concentrou-se na Ásia e Oceania, seguidas pela Europa e América com 29%. O v…
We study the phase diagram of a frustrated spin-1/2 ferromagnetic chain with anisotropic exchange interactions in an external magnetic field, using the density matrix renormalization group method. We show that an easy-axis anisotropy enhances the tendency towards multimagnon bound states, while an easy-plane anisotrop…
North Carolina State University Theses Physics.
The Interactions between N-H contenting chemicals and hydrides produce hydrogen. Such strong interactions enable those substances potential materials for hydrogen storage. In the \nprevious investigations, 10.5wt.% and 11.9 wt.% of hydrogen storage capacities were achieved in lithium amide-lithium hydride and lithium…
The U.S. government has announced the battery and electric drive projects that will get grants totaling $2.4 billion under the American Recovery & Reinvestment Act (C&EN, July 27, page 24). Through a competitive process, the Department of Energy selected 48 projects, many involving chemical firms and universities, int…
The todorokite manganese oxides were widely examined as lithium insertion hosts for cathodes in rechargeable lithium batteries, catalytic materials, adsorbents, etc. Cu(superscript 2+) doped todorokites also showed potential as electro-catalytic materials with selectivity. In this paper, the single and Cu(superscript…
A series of Ce(subscript 1-x)Tb(subscript )O(subscript 2-δ) mixed oxides were prepared by a sol-gel method. In situ Raman spectroscopy combined with X-ray diffraction (XRD), H2-temperature programmed reduction (H2-TPR) and O2-temperature programmed desorption (O2-TPD) were used to analyze oxygen vacancies in the mixed…
In March 2007 we published B.J. Dalton's1 article, ‘Two-mode theory of BEC interferometry’, Journal of Modern Optics, Vol. 54, No. 5, 2007, 615–637. 1Australian Research Council Centre of Excellenc...
Ce(subscript 0.1+x)Ti(subscript 0.5-x)Al0.2Y0.1La0.1O0.8(0≤x≤0.4) mixed oxides were prepared by co-precipitation method and characterized by means of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) nitrogen adsorption (BET), oxygen storage capacity (OSC), H2-temperature programmed reduction (H2-TPR) an…
All articles of this category Introduction Heteropolyoxometalates as stable inorganic porphyrins have attracted much attention in the last two decades. The versatility of these catalysts has been demonstrated in various organic transformations due to their weak super-acidicity, redox properties, low toxicity, stabilit…
The crystal structure of BaCu 2 (PO 4 ) 2 has been refined from X-ray powder data. BaCu 2 (PO 4 ) 2 crystallizes into a triclinic structure which belongs to the space group P-1, which unit cell constant a = (9.226±0.023)(1) A, b = (9.271±0,018)(1) A, c = (10.516±0,09)(1) A, α = (106.76±0.12)(5) o , β = (101.65±0.16)(5…
No presente trabalho analisou-se a influência do tempo e da temperatura de calcinação, de lamas residuais de minas de tungsténio aditivadas com carbonato de sódio. A reactividade das lamas foi avaliada através de ensaios de resistência á compressão em argamassas activadas alcalinamente. Os resultados apontam para o fa…