Materials Literature
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The laboratory implementation of grazing incidence in-plane X-ray diffraction, using an unmodified commercial diffractometer, is described. Low resolution, high intensity measurements are illustrated in the study of the in-plane lattice parameters and texture of a thin polycrystalline ZnO film on glass, the in-plane o…
We investigated the effects of a chemically‐vapor‐deposited mullite coating (∼100 nm) on the oxidation resistance of sintered Si 3 N 4 in air and steam environments. The coating was sacrificially incorporated into the thermally grown oxide (TGO) on Si 3 N 4 during isothermal oxidation in air at 1400°C, leading to sign…
Swelling properties of chitosan-gelatin films cross-linked by sulfate were investigated. Sulfate cross-linked chitosan-gelatin films (SCG) were prepared simply by dipping chitosan-gelatin films into sodium sulfate solution. The swelling behavior of SCG was investigated as a function of pH and ionic strength. Under aci…
Time-resolved luminescence spectra of an exciton-exciton scattering process and an electron–hole plasma (EHP) were measured in ZnO epitaxial thin films by the optical Kerr gate method. At moderate excitation density below critical Mott density, stimulated emission of luminescence due to the exciton–exciton scattering…
EXPERIMENTS ON ALUMINUM TUBES WITH VARYING D/T RATIOS AND THEIR FINITE ELEMENT SIMULATION HAVE BEEN PERFORMED TO STUDY THEIR COLLAPSE MECHANISM AS WELL AS THE LOAD COMPRESSION AND THE ENERGY ABSORPTION RESPONSES. CONVERGENCE STUDIES WITH RESPECT TO MODEL PARAMETERS LIKE LOAD STEP SIZE, MESH DENSITY AND BOUNDARY CONDIT…
A utilização de proteínas sarcoplasmáticas junto de proteínas miofibrilares pode ser interessante na tecnologia de filmes comestíveis, pois eliminaria o processo de lavagem do músculo no preparo das proteínas. O objetivo deste trabalho foi estudar propriedades físicas de filmes constituídos de proteínas miofibrilares…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
In air-jet weft insertion, the weft yarn is moved by the frictional drag between the air stream and the yarn surface. This paper reports the computer simulation of this process in order to determine the motion of the yarn during weft insertion. Forces acting on the weft . depend on time as well as the varying position…
The paper presents alternative numerical techniques implemented in power transformer analysis and design focusing on the short circuit impedance evaluation. The proposed method adopts a particular reduced scalar potential formulation enabling a three-dimensional (3-D) magnetostatic problem solution. This method, requi…
Nickel oxide/zinc oxide structures were formed by evaporating Ni onto ZnO and annealing in oxygen. The electrical properties of this nickel oxide layer were investigated by four-point probe measurements and those of the nickel oxide/zinc oxide junction by variable temperature current-voltage (I-V) measurements. NiO la…
The atomic and magnetic structures of the iron-doped Pr 0.7 Ca 0.3 Mn 1− y Fe y O 3 manganites ( y =0, 0.1) have been studied at high pressures of up to 4 GPa in the temperature range 16–300 K. At normal pressure, Pr 0.7 Ca 0.3 MnO 3 undergoes a phase transition from the paramagnetic to an antiferromagnetic (AFM) stat…
Many current tissue-engineering investigations aim at the rational control of cell adhesion and tailored composition of biomaterial surfaces by immobilizing various protein and peptide components, such as growth factors. As a step on the way to develop polymers that allow for such surface modifications, water-soluble…
The covalent character of the high performance ceramics used for the fabrication of MMC preforms demands high sintering temperatures to guarantee sufficient interconnection between powder particles. To minimize this cost‐intensive sintering step, several preceramic polymers suitable for binding MMC preform particles w…
In this work the influence of harmonic content of the voltage waveform on electrical treeing growth in XLPE (cross-linked polyethylene) is investigated. In particular the lifetimes of XLPE specimens, having a point plane electrode configuration, subjected to different distorted voltages containing 3/sup rd/, 5/sup th/…
The structures, magnetism, and electronic transport properties of the semiconducting $({\mathrm{La}}_{1+x}{\mathrm{Ca}}_{1\ensuremath{-}x}){\mathrm{CoRuO}}_{6}$ double perovskites $(\ensuremath{-}0.25<x<0.25)$ have been investigated. Lattice parameters, antisite disorder, the N\'eel temperature and resistivities…
The kinetic theory developed in [1] for solutions of nonhomogeneous nematic liquid crystalline polymers (LCPs) of spheroidal molecular configurations is extended to account for the translational diffusion and the related spatial density variation. The new theory augments the effect of the density variation to the inte…
This paper reports on the results of investigations into the influence of variations in the chemical composition of the aromatic core of cyano-containing molecules of liquid crystals on their dielectric properties in the frequency range 1–2000 MHz. It is shown that the dispersion of the longitudinal permittivity is ad…
An integrated Mach-Zehnder interferometer made of electro- optic (EO) polymers with a dimension of 331.2 cm was fabricated as a wideband rf receive antenna. When an electric field is applied to the interferometer arm(s) made of EO material, a phase delay is generated that results in a net imbalance in the interferomet…
Investigations of thermotropic phase transitions performed on organocyclosiloxanes [PhSi(O)OSiR]6, where R is Me3, Me2(CH2Cl) or Me2(CH≃CH2), have revealed that all these hexamers are mesomorphic compounds. The hexamers exhibit uncommon polymesomorphic behaviour forming two quite different mesomorphic structures. The…
Abstract This paper focuses on experimental observations of poly(vinyl chloride) (PVC) degradation during injection molding. Degradation of poly(vinyl chloride) has been extensively studied. These studies have been performed in quiescent systems with very little or no strain applied to the sample. However, during proc…