Materials Literature
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Os Neossolos Litólicos e Neossolos Regolíticos são solos pouco estudados no Brasil devido ao seu baixo potencial relativo de uso. Esse fato se reflete em dificuldades na execução da sua descrição morfológica no campo, principalmente no que se refere aos contatos entre solo, saprolito e rocha, e na sua classificação no…
A new device structure of phase-change memory (PCM) cell with a Probe like bottom electrode (PBE) was proposed and its electrical-thermal characteristics were investigated by three-dimensional finite element analysis. The programming region of the definition (GST) layer in the PBE cell is much smaller than that in a c…
By using the linearized two-fluid quantum hydrodynamic model for σ and π orbitals, the dispersion relations of electromagnetic waves in the single-walled carbon nanotubes are investigated. By injection of a relativistic electron beam, the excitation of electromagnetic waves in this system is studied. The graphs of ope…
Complete regeneration of damaged extremities, including both the epithelium and the underlying tissues, is thought to occur mainly in embryos, fetuses, and juvenile mammals, but only very rarely in adult mammals. Surprisingly, we found that common strains of mice are able to regenerate all of the tissues necessary to…
The effect of particle size on magnetic properties in single-crystalline multiferroic YMn2O5.07 nanoparticles was investigated. A modified Pechini’s method was employed to synthesize YMn2O5.07 powders with different particle sizes under an atmosphere of 10 bar O2. It was found that the multiferroic YMn2O5.07 compound…
A coesão de horizontes de solos do Brasil vem sendo associada, principalmente, a fatores físicos e químicos inter-relacionados, mas a influência das propriedades mineralógicas e cristalográficas dos minerais da fração argila também foi aventada por alguns pesquisadores. Neste trabalho, testou-se a hipótese de que a fr…
Abstract A series of water-soluble dendritic ligands with a phosphine core was synthesized through the coupling of tris(4-hydroxyphenyl)phosphine oxide with poly(benzyl ether) dendron having tri(ethylene glycol) units, followed by reduction. By employing the corresponding water-soluble phosphine–gold(I) dendrimers as…
The dynamic response of an icosahedral Al–Pd–Mn quasicrystal with a Griffith crack to impact loading is investigated in this paper. The elastohydrodynamic model for the wave propagation and diffusion together with their interaction is adopted. Numerical results of stress, displacement and dynamic stress intensity fact…
We report on the thermoelectric properties of FeSb 2 in comparison with the iso-structural RuSb 2 , both of which are narrow-gap semiconductors. Significant difference in the thermoelectric properties is found between the two systems. Despite similar charge carrier concentrations, the thermoelectric power factor diffe…
Abstract A novel chitosan‐formaldehyde porous derivative (scaffolds) was prepared by reaction of 85% deacetylated chitosan with 37% aq. formaldehyde using supercritical carbon dioxide (sc. CO 2 ). Prior to reaction, the chitosan hydrogel was prepared in 1% aq. acetic acid (AcOH) and formaldehyde. The prepared hydrogel…
Under slightly acidic conditions and 25 °C, the interaction between phosphate-rich aqueous solutions and gypsum cleavage fragments results in the surface precipitation of brushite (CaHPO 4 ·2H 2 O) crystals, which grow epitaxially on the (010) surface of gypsum. Using an A-centered unit-cell setting for both brushite…
Abstract Chitosan has been modified by incorporating a cationic moiety N‐ (3‐chloro 2‐hydroxypropyl) trimethyl ammonium chloride (CHPTAC) onto its primary amine group in aqueous alkali medium. A series of modified chitosan copolymers (Chito‐cat‐1 to Chito‐cat‐5) was synthesized by varying the CHPTAC to chitosan ratio.…
Extruded n -type materials based on Bi 2 Te 3 -Bi 2 Se 3 alloys containing 6 to 40 mol % Bi 2 Se 3 have been investigated using microstructural analysis and thermoelectric measurements at room temperature and in the range 100–400 K. Their electrical properties have been compared to those of single-crystal analogs. Com…
Within the framework of the International Energy Agency, an international collaborative study on fusion radioactive waste has been initiated to examine the back end of the materials cycle as an important stage in maximizing the environmental benefits of fusion as an energy provider.The study addresses the management p…
Slender rods in concentrated suspensions constitute strongly interacting systems with rich dynamics: transport slows down drastically and the anisotropy of the motion becomes arbitrarily large. We develop a mesoscopic description of the dynamics down to the length scale of the interparticle distance. Our theory is bas…
The effect of the alignment layer properties on the observed threshold voltage ( V th ) of carbon-nanotube (CNT)-doped liquid crystal cells is investigated. The V th of cells with [3-(trimethoxysilyl)propyl]octadecyl-dimethylammonium chloride (DMOAP) as the alignment layers increases as the CNT concentration increases…
Hydrogen storage in a metallic nanoparticle was simulated by classical molecular dynamics. Distribution of hydrogen atoms inside nanoparticle was investigated by changing length and energy parameters of metal– H bonds. Hydrogen atoms diffused into the particle and distributed homogeneously in case of weak metal– H bon…
Thermal-electrical-fluid coupled finite element analyses are performed in the model of the growth cell in a high- pressure and high-temperature (HPHT) cubic apparatus in which the large diamond crystal can be grown by using Ni-based solvent with temperature gradient method (TGM). The convection in the Ni-based solvent…
The flame-retardancy and mechanical properties of styrene-ethylene/butylene-styrene block copolymer (SEBS) based composites, containing SEBS blended with a paraffinic hydrocarbon extender oil, copolymer polypropylene (PP), and magnesium hydroxide (MH) or silane coupling agent surface-treated magnesium hydroxide (m-MH)…
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