Materials Literature
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The liquid-crystal alignment properties of gratings with a 1–10-μm period are described. Experiments are presented to compare the roles of interfacial interactions and surface topography in determining alignment. It is shown that grooves are neither necessary nor always sufficient to produce alignment. Interfacial for…
Antireflective (AR) coatings, which are produced from organometallic driven solutions containing oxide constituents in a chemically polymerized form, are presented. These solutions leave a film on substrates which, upon heat treatment, converts to a glasslike oxide film having the desired optical thickness and index o…
We have carried out computer simulations of the freely jointed polymer chain with an excluded volume interaction using a dynamic Monte Carlo method for chain lengths N between N=8 and N=100. The equilibrium values of end-to-end distances and radius of gyration approach the asymptotic form ∼Nν for N≳70 (scaling limit)…
High-temperature measurements have been performed on the electronically conducting oxide system ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}\mathrm{Cr}{\mathrm{O}}_{3}$ ($0<~x<~0.4$). The electrical conductivity displayed thermally activated temperature dependence between 300 and 1900 K with activation ene…
The electrical resistivity, magnetic susceptibility and EPR of (Ti 1-x V x ) 4 O 7 single crystals (0<x<1.6 at.%) have been studied between 4.2 and 300K and the heat capacity was examined in the range 120-300K. Pure Ti 4 O 7 and the compounds with x< approximately 0.35 at.% show three phases, a low-temperature semicon…
The authors demonstrate that the order of kinetics of the TL process can change with the dose received by a sample. In LiF the order of kinetics becomes constant only when the dose given to the sample is smaller than the saturation dose by at least an order of magnitude. The order of kinetics followed by glow peaks V…
The influence of the coupling between valence and conduction bands on the scattering of electrons by acoustic phonons is investigated for the case of bismuth. The calculation is based on a model employed previously for the lead chalcogenides and InSb. Elements of the weak field thermodynamic tensor have been analysed…
The Raman spectrum of NiCl 2 has been measured at various temperatures above and below the antiferromagnetic ordering temperature T N =52.3K. Two prominent bands at 175.2 and 270.9 cm -1 (6K) were observed at all temperatures and are assigned to the E g and A 1g k=0 optic phonons, respectively. A careful search was ma…
The mechanism of ozone generation in the silent discharge of air-fed ozonisers is studied theoretically and experimentally. The nitrogen oxides (NO x ) formed in the silent discharge have been found to play an important role in the process of ozone generation due to the catalytic cycle for O 3 destruction: NO+O 3 to N…
The Raman spectra of 4-pyridine-carboxaldehyde-doped Al-${\mathrm{Al}}_{2}$${\mathrm{O}}_{3}$-Ag tunnel junctions evaporated onto Ca${\mathrm{F}}_{2}$ films and optical diffraction gratings show that the molecular Raman scattering is strongly enhanced under conditions which permit the direct excitation of the surface…
Abstract Suitable chemical treatment of North Sea oil and gas production plays a small but vital role in determining the production plays a small but vital role in determining the success of the project. During the initial period of production from a new oilfield, the chemical treatment requirements are generally mini…
This Letter presents x-ray studies of freely suspended smectic liquid-crystal films from 2 to >100 layers thick. Smectic-$B$ thick films of butyloxybenzylidene octylaniline (40.8) have three-dimensional long-range order while thin films are two-dimensional crystals. Large diffuse scattering is observed from soft sh…
Abstract The effect of moisture on the glass transition temperature of poly(hydroxy methylene) was investigated by thermal analysis which entailed combinations of DTA and DSC with TGA techniques. As the moisture content increased, the glass transition temperature ( T g ) decreased monotonically from a value ( T go ) o…
Critical specifications of Thor, an old assembly of thorium-reflected plutonium, have been refined. These specifications are brought together with void coefficients, Rossi-alpha values, fission traverses, and spectral indices.
The fusion-fission hybrid blanket proposed for the Tandem Mirror Hybrid Reactor employs thorium metal as the fertile material. Based on the ENDF/B-IV nuclear data, the /sup 233/U and tritium production rate and blanket energy multiplication averaged over the blanket lifetime of about 9 MW-yr/m/sup 2/ are 0.76 and 1.12…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFunctionality and Structure of Polymers. 3. Synthesis and Thermal Properties of Polymers Having a Dianthracene Main ChainShigeo Tazuke and Toshio TanabeCite this: Macromolecules 1979, 12, 5, 848–853Publication Date (Print):September 1, 1979Publication History Published onlin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStatistical Properties of Alternating Copolymers. 1. Dipole Moments of Poly(thiodiethylene glycol) ChainsE. Riande and J. GuzmánCite this: Macromolecules 1979, 12, 5, 952–956Publication Date (Print):September 1, 1979Publication History Published online1 May 2002Published ini…
"Snapping and Shaky Antiprisms." Mathematics Magazine, 52(4), pp. 235–236
The pyrochlore-type compound Cd 2 Ti 2 O 5 F 2 and the perovskite-type CdTiO 3 were prepared by the reaction of CdF 2 with TiO 2 at high temperatures. The techniques used for the growth of single crystal are presented. A study was carried out the dielectric properties of single crystal specimens. No evidence for ferro…
A new stoichiometric compound of Nd, K5NdLi2F10has been synthesized and its spectroscopic and lasing properties are reported. The material is characterized by a room temperature decay time of 300 μs, increasing to 500 μs in diluted samples. This represents the least amount of concentration quenching reported in this c…