Materials Literature
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Diamond was deposited on substrates pre-etched with diamond powder using either a microwave plasma chemical vapor deposition method or a hot-filament-assisted chemical vapor deposition method. Density of residual diamond dust (i.e., number of diamond particles per unit area on the surface of a substrate) on the pre-et…
Dynamic dielectric and mechanical responses in the splitting region of PnBMA are analysed with the help of two Havriliak-Negami-function fits. The alpha and beta processes in the Arrhenius diagram are parallel to each other over a wide temperature range, and do not merge.
For the first time the surface structure of an icosahedral quasicrystal could be resolved in direct space by scanning tunneling microscopy. The surface was found to form terraces with their normals being parallel to a fivefold axis. On the terraces fivefold stars and pentagonal holes were observed. Both the step heigh…
Dc magnetron sputtered Ni-Mn and Ni-Mn-Cr films are demonstrated to exhibit strong and thermally stable antiferromagnetism, as well as high corrosion resistance. For a 25.2 nm thick 53.3 Ni-46.7 Mn (in atomic percent) film deposited on top of a 28.5 nm thick 81 Ni-19 Fe film, a unidirectional anisotropy field (HUA) of…
This review presents the state of the art of the study of germanium-related colour centres in silica glass and silica-based fibres. Most attention is concentrated on the dominant colour centres such as the Ge-related oxygen-deficient centres and paramagnetic Ge(n) centres, all of them having ultraviolet absorption ban…
The crystal structure of the complex between ribonuclease A and d(ApTpApApG) has been solved by x-ray crystallography using the molecular replacement method. The model includes, besides the enzyme, the d(ApTpApA) 5'-segment (A1T2A3A4) and 68 solvent molecules. The R-factor for the strongest 87% of the measured data th…
The atomic-scale dynamics of the glass-to-liquid transition are, in general, poorly understood in inorganic materials. Here, two-dimensional magic angle spinning nuclear magnetic resonance spectra collected just above the glass transition of K(2)Si(4)O(9) at temperatures as high as 583 degrees C are presented. Rates o…
The selective catalytic reduction reaction of nitric oxide bv ammonia over vanadia-titania catalysts is one of the methods of removing NOx pollution. In the present study, it has been possible to identify the reaction mechanism and the nature of the active sites in these catalysts by combining transient or steady-stat…
A simple technique is described here that produces aligned arrays of carbon nanotubes. The alignment method is based on cutting thin slices (50 to 200 nanometers) of a nanotube-polymer composite. With this parallel and well-separated configuration of nanotubes it should be possible to measure individual tube propertie…
Abstract A comprehensive non-LTE analysis of Na I lines was performed in order to investigate the photospheric abundance of sodium in typical bright A–F supergiants. Along with the strongest subordinate line, Na I λ8195, newly observed for this study, which enabled us to determine the Na abundance of A supergiants for…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
A technique of mapping a region of reciprocal space near a given substrate reflection using a standard powder diffractometer enabling (θ−ω/2θ) scan is applied to investigate superlattices grown on misoriented substrate. The parameters describing superlattice geometry are calculated on the basis of collected diffractio…
Abstract Experiments were performed to study the variation upon storage at room temperature of both the bound rubber and the rheological properties of filled rubber compounds, prepared either with high cis ‐1,4 polybutadiene or with natural rubber and various levels of a reinforcing carbon black. It was found that the…
The electric permittivity of ceramic NaNbO 3 : x Mn (x=0-1 wt.%) was measured in the range 20-500 degrees C. The Mn dopant induces an additional anomaly in the epsilon (T). The temperature of the maxima in epsilon (T) is shifted under applied axial pressure. The X-ray test proved that the anomalies in epsilon (T) are…
The characterization of nanometer-scale phase separation in sputtered, amorphous, metal-Ge and Fe-Si films has led to the observation of a new microstructure that extends through the metal-insulator transition. The phase separated regions, which are dependent on deposition conditions, are well correlated and of the or…
Abstract In this article, the graft copolymerization of methy methacrylate with canna‐starch under the initiating of manganic pyrophosphate was investigated systemly. It was found that the percentage of grafting, grafting efficiency, and rate of grafting were all dependent, to some extent, on the concentration of the…
OBJECTIVE: The purpose of this study was to demonstrate that gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA) could be used as a contrast medium in CT as an alternative to iodine-based compounds. MATERIALS AND METHODS: Solutions of different concentrations of Gd-DTPA and iopromide were scanned in a tissue equi…
We present a new electro-chemical method for incorporating high concentration Er ions deep into porous silicon layers and its intense photoluminescence at ∼1.54 μm at room temperature. Porous silicon layers prepared by anodic etching of p-type silicon substrates in HF/H2O are immersed in ErCl3/ethanol solution. Then t…
Abstract Binary blend films from lactide‐rich poly( D ‐lactide‐co‐glycolide) (PDLG) and poly( L ‐lactide‐co‐glycolide) (PLLG) were obtained by casting methylene chloride solutions of the two mixed copolymers with different D‐ and L‐lactide contents ( X DI and X LI ), and their crystallization was studied by differenti…
The response of a soft-phonon ferroelectric material subjected to a high-intensity optical pulse of duration much shorter than the period of the phonon is modeled using a classical, finite-temperature simulation. It is found that complete, permanent reversal of the orientation of the ferroelectric domains may occur ev…