Materials Literature
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A partially relaxed constraints grain deformation model is proposed to explain the influence of temperature on the rolling textures of fcc metals. The effects of the grain plastic shear in the TD/RD plane and the role of the rate sensitivity of crystallographic slip on the evolution of the texture have been investigat…
The susceptibility to hydrogen embrittlement in martensitic steels containing Cr, Ni and Mo under stress and hydrogen diffusion have been investigated by electrochemical methods. As the content of alloying elements was increased, the apparent diffusion coefficient of hydrogen (D) and the threshold hydrogen permeation…
To study the effects of the fictive temperature, Tf, and the OH-group on the refractive index, n, of silica glass, several samples were prepared containing from 680 to 850wt ppm of OH-group in different distribution patterns. Trimethoxymethylsilane was used as a raw material and hence the samples contained no detectab…
The crystal structure of LiNbO3 with congruent composition was refined at room temperature by means of the single-crystal X-ray diffraction method under consideration of anharmonic thermal vibration. The space group is R3c with the hexagonal cell dimensions of a=5.15020(6) and c=13.8653(4) Å and Z=6. Large residual el…
Abstract Ellipsometry was used to study solid‐surface energetic and temperature effects on the apparent equilibrium adsorptive behavior exhibited by β‐lactoglobulin. Adsorption isotherms were constructed for β‐lactoglobulin on seven different silicon surfaces chemically modified to exhibit varying hydrophobicities: pl…
The conditions for the use of Electron Spectroscopic Imaging (ESI) in the observation of DNA molecules adsorbed on carbon film are described. The Zeiss 902 electron microscope with its built-in spectrometer allows original modes of imaging, such as energy-filtered annular dark-field. The six different modes of imaging…
The orientation of the smectic-A and -C* layers, inside 25 μm pores of glass capillary arrays, has been studied by high-resolution x-ray diffraction. The pores were coated with lecithin in order to ensure perpendicular anchoring of molecules at the surface. A chevron-like layer structure was seen in the smectic-A phas…
Abstract
Abstract Electron beam irradiation of ethylene‐vinyl acetate copolymer (EVA) film results in a marked depression of sorption of flavour compounds. This effect is presumed to be brought about by radical reactions, following changes in the structure. The crosslinking density and gel fraction increased with irradiation d…
Phase-matched second-harmonic generation (SHG) is observed in a four-layer 2-methyl-4-nitroaniline (MNA) single-crystal film waveguide with grating couplers. The measured input- and output-coupling efficiencies of the grating and the measured propagation loss of the four-layer waveguide are 9.9%, 42.0%, and 15.1 dB/cm…
An NVT Metropolis Monte Carlo computer simulation is used to examine the P-T behavior of a constant-density model periodic ice-Ih sample near melting. The ice unit cell with density 0.904 g/${\mathrm{cm}}^{3}$ consists of 192 rigid water molecules interacting via the revised central-force potentials (RSL2) of Stilling…
We have prepared new esters of 6-alkyloxypyridazine-3-carboxylic acid and the 6-alkyloxypyridine-3-carboxylic acid. The introduction of the heteroaromatic rings leads to significant changes in mesomorphic behaviour. The compounds exhibit a strong tendency to form smectic C phases.
A linear instability analysis of a planar layer of dielectric liquid subjected to both an injection of ions and an applied temperature difference is performed. The variations of both the ionic mobility and the electrical permittivity are assumed to be linear in temperature. Whilst the injection of ions is expected to…
The cholesteric liquid crystal (CLC) pitch and director orientation are obtained as the functions of the anchoring energy W of a director and its pretilt angles Δϑ1, Δϑ2 on the cell orienting surfaces. If the anchoring energy is strong enough, the monotonic change of the CLC twisting ability due, for example, to the l…
Transformation characteristics and deformation behavior of hydrogenated Ti-50.5 at%Ni alloys, which were occluded in a low pressure range of hydrogen between 1.1 and 78.5 kPa, have been studied by electrical resistivity measurement, tensile test, X-ray diffraction analysis and microstructural observation.Ms temperatur…
Uptakes of Cu2+, Pb2+ and Zn2+ on various synthetic hydrotalcite (HT-0O3, HT-SO4, HTCl and HT-NO, ) were investigated in Cu(NO3)2, Pb(NO3)2, Pb(NO3)2 and Zn(NO3)2 aqueous solution (each conc.: 2000 mgdm-3). Hudrotalcite has a pronounced activity for the uptakes of Cu2+, Pb2+ and Zn2+. Amounts of Cu2+, Pb2+ and Zn2+ re…
Abstract A new polyimide derived from 4,4′‐isophthaloyldiphthalic anhydride (IDPA) and 1,3‐ bis (4‐aminophenoxy‐4′‐benzoyl)benzene (1,3‐BABB) having semicrystalline behavior was prepared at NASA Langley Research Center in 1987. The crystalline transitions of this thermoplastic polyimide have been studied. The differen…
The influence of the calcination temperature on the structure and morphology of vanadium oxide promoted, silica-supported rhodium catalysts was studied. Pure Rh/SiO2 and VOx/SiO2 served as reference systems. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), temperature-…
Abstract A new digital filter method has been developed for enhancement of detail recognition in SEM images of high signal‐to‐noise ratio using an on‐line digital image processing system. The filter allows an automated improvement of the presentation of SEM image information and utilizes a median filter of very large…
Abstract The superconducting transition temperature (Tc) was investigated by alloying (BEDT-TTF)2Cu[N(CN)2]Br with (BEDT-STF)2Cu[N(CN)2]Br. The Tc of the former rapidly decreased with doping the latter. The relation between stoichiometry and structure is also discussed.