Materials Literature
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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.
The first volume of this two-volume reference, Survey of measurement techniques was published in 1984 and provided an exhaustive compilation of methods for the measurement of thermal and electrical conductivity, thermal difusivity, specific heat, thermal expansion, and thermal radiative properties o
The resistivity of high purity copper was measured by a method which estimates it by using the difference in the impedance between a circular multilayer solenoid coil with a circular rod-shaped copper sample and a similar coil without a copper sample (SRPM method). The residual resistivity ratio (RRR) of high purity c…
PVDF samples with high beta content (80%), prepolarized at room temperature, were heated to higher temperatures. The polarization was measured first under open circuit conditions at the high temperature and then after cooling down again to room temperature For elevated temperatures up to 175 degrees C the polarization…
The authors have succeeded to prepare dense sintered bodies of perovskite LaNiO3, which shows a metallic conduction, by HIPping without flux such as Na2CO3. The stoichiometric mixture of La2O3 and NiO was precalcined in air at 900°C for 5h. The ground sample was then sintered at 1100° or 1300°C in air for 20h. The sin…
A number of fulvene compounds, which can polarize to give rise to intramolecular charge transfer (ICT), have been synthesized, and the second-order molecular hyperpolarizability (β)and dipole moment (µg) have been calculated by using the MOPAC program. The macroscopic non-linearity (second-harmonic generation; SHG) ev…