Materials Literature
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Carbothermal reduction—nitridation (CRN) of SiO 2 is an attractive method to manufacture Si 3 N 4 powders with controlled grain morphology. Moreover, β‐SiAlON powders could also be synthesized from either pure powder mixture or some inexpensive raw minerals by CRN and the resulting powders favored the sintering of SiA…
HfV2O7 powders were prepared by means of thermal decomposition of a mixture of vanadyl and hafnyl oxalates in air at 973 K. The room temperature structure and its evolution with temperature was investigated using both electron microscopy (TEM and HREM) and powder diffraction (X-ray and neutron) techniques combined wit…
The preparation of vanadate glasses containing barium oxide and their electrical properties in the temperature range of 80–500 K have been reported in this article. Analysis of the electrical properties has been made in the light of different hopping models. The multiphonon assisted hopping model of small polarons in…
Driven by differing statutory mandates and programmatic separation of regulatory responsibilities between federal, state, and tribal agencies, distinct chemical and radiation risk management strategies have evolved. In the field this separation poses real challenges since many of the major environmental risk managemen…
In this paper, we present our recent results of studies of the nitrogen absorption process, magnetization measurements, and neutron powder-diffraction measurements for interstitially modified nitrides ${R}_{2}{\mathrm{Fe}}_{17}{\mathrm{N}}_{3}$ $(R=\mathrm{Y},$ Ce, Nd, and Sm) and ${\mathrm{Y}}_{2}{\mathrm{Co}}_{17}{\…
Abstract The processing properties of fibrous preforms and the final properties of liquid moulded composite parts are strongly related to the internal architecture of the preforms. The architecture of a preform is determined by the individual textile layers from which it is made. In order to calculate the processing a…
New methods were developed for the determination of the plasticization parameters and the limit diffusion coefficient of a penetrant whose diffusivity varies exponentially with its concentration. No specific computer softwares is required for their use and they are user friendly. The method using differential permeati…
Combined analötical and numerical techniques and procedures have been developed to characterize the hardening due to grain growth for materials under superplastic deformation. The conventional grain growth rate equation is modified to enable accurate modelling of isothermal and plastic-strain-induced grain growths for…
Preface. Introduction. Design of composite products. The assessment loop. The outline design loop. The detailed design loop. The validation loop. Fibres. Matrix Resins for engineers. Lamina (one ply)/laminate (many plies) properties. Reinforcement forms. Core materials. Ancillary materials. Fabrication processes. Non-…
X-ray diffraction patterns of [N(CH3)4][CdCl3], tetramethylammonium trichlorocadmate(II), have been investigated in the temperature range 80-293 K, which includes two phase transitions at 118 and 104 K, respectively. The main interest in this compound is to establish the mechanism of the structural phase transitions c…
O presente estudo abordou a existência e as principais características de vinte resíduos de fibras vegetais, resultantes de processos agroindustriais, voltados para a obtenção de oito diferentes tipos de fibras comerciais. Com base em critérios de seleção inicialmente estabelecidos, foram identificados seis resíduos d…
The regioselective preparation of ortho-substituted subphthalocyanides was achieved employing 3-substituted phthalonitrile derivatives as starting materials. A mechanistic proposal has been outlined.
This study examines the influence of radial thickness on the thermal conductivity of thin metallic wires. While size effects on the electrical conductivity of thin wires have been discussed in the literature, research into size effects on thermal conductivity still requires investigation. At such small length scales,…
Abstract Cetyltrimethylammonium- and tetradecyltrimethylammonium-intercalated magadiites were prepared by direct syntheses, starting from sodium metasilicate (Na 2 O/SiO 2 = 1.0) and nitric acid. Total substitution of sodium by cetyltrimethylammonium or tetradecyltrimethylammonium cations was not achieved in the range…
Polymeric materials play an important role in the construction and performance of liquid crystal displays. New functional polymers are developed to improve the displays on brightness, power efficiency and viewing angle performance. Polymer films with a controlled molecular structure and architecture provide new polari…
Re(1,2-diimine)(CO)3Cl compounds containing the p-substituted bis(arylimino)acenaphthene derivatives DIAN-R with R = H, Me, OMe, Br, and Cl were prepared and characterized. The diimine ligands of this series provide unoccupied orbitals at rather low energies and display a pronounced π-accepting strength. This feature…
Abstract The thermal energy necessary for the removal of molecular water from Li + -, Na + -, Cs + -, Mg 2+ -, Ca 2+ -, Ba 2+ -, Al x (OH) y z+ - and La 3+ -homoionic montmorillonite powders was determined by thermogravimetric analysis under atmospheric pressure. The weight loss curves and their derivatives exhibit on…
Results of Differential Scanning Calorimetry (DSC) under non-isothermal condition of Se85—xTe15Sbx (x = 0, 2, 4, 6, 8 and 10) glasses are reported and discussed. The glass transition temperature at different heating rates and structural changes during glass transition have been determined from an empirical relation. T…
Effects of alloying elements on electrochemical properties of magnesium-based sacrificial anodes were evaluated. Potentiodynamic, galvanostatic, potentiostatic, scanning electron microscopy (SEM), and x-ray diffraction (XRD) analyses were used to investigate the corrosion rate, efficiency, and surface characteristics…
A circular braiding machine can be used to produce complex shapes by overbraiding a contoured mandrel and adjusting the process parameters. To simplify the design process and advance this technology, a CAD model is developed to describe the geometry of a 3D circular braid both externally and internally. A quadrilatera…