Materials Literature
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The 5RL centre has been produced in natural semiconducting diamond by radiation damage and annealing to about 300 degrees C. The 5RL system is observed in both absorption and cathodoluminescence, and is of interest because the zero-phonon transition couples to local-mode phonons with energies well above those of the l…
Using optical second-harmonic generation as a probe, we have observed polar ordering of ${4}^{\ensuremath{'}}\ensuremath{-}n\ensuremath{-}\mathrm{octyl}\ensuremath{-}4\ensuremath{-}\mathrm{cyanobiphenyl}$ (8CB) molecules in a monolayer at an 8CB-glass interface, but nonpolar ordering at the free surface of 8CB as well…
Durable electrochromic coatings of hydrated nickel oxide were produced by reactive rf magnetron sputtering of Ni followed by treatment in KOH. Spectrophotometry was used to assess the achievable modulation of luminous and solar transmittance and to verify that the studied material is interesting for ‘‘smart window’’ a…
A fundamental limitation of LEED as a surface-structure probe is the complexity of the theory compared with x-ray scattering from solids. By making one full dynamical calculation for a reference structure we express diffraction from modifications of this structure in first-order perturbation theory. This gives a theor…
Abstract A method is described for growing single crystals from a solution where a base’s concentration is controlled so that an adduct to be grown is equilibrated with the solution. A slight difference in its solubilities at two different temperatures is responsible for their growth process. The technique is valuable…
The effects of two commercial chitin synthesis inhibitors, dimilin and polyoxin D, on chitin fiber formation and cell sedimentation for the diatoms Thalassiosira fluviatilis and Cyclotella cryptica (Bacillariophyceae) were investigated. Dimilin treatments for both diatom species were indistinguishable from controls in…
Abstract Quarzglas enthält kleine Mengen Wasser, die beim Erhitzen frei werden. Das daraus beim Transport Von TiOCl oder Von Cr 2 S 3 (+AlCl 3 ) entstehende HCl kann für den Transportvorgang wesentlich sein.
Abstract Crystal defects in calcite containing Na and K ions were investigated by means of a model based on statistical thermodynamics and measurements of thermoelectric power. The varying amount of Na and K ions in the crystal was interpreted on an assumption of ideal solution of the ions as Ca1−x−y\squarex+y[Na2x, K…
The nature of fibre migration, the number of fibres in yarn cross-section and the factors that influence the strength of rotorand ring-spun yarns have been studied. Rotor yarn comprised 15%less fibres in yarn cross-section than the corresponding ring yarn. Fewer fibres in ~arn cross-section in rotor yarn result in les…
The radial packing density of rotor-spun yarn was measured on the basis of the theory reported earlier by the author [J ndian J Text Res, 11 (1986) 26]. The effect of yarn twist and count on the fibre packing density of rotor-spun yarn in comparison with tbat of ring-spun yarn was studied. The packing density of both…
Abstract A supplementary device to a scanning electron microscope allows the simultaneous taking of wide‐angle interferences in the directions of transmission and back reflection of identical specimen areas. A developed computer program simulates the complete reflex system so that the identity with the pattern is obta…
A novel laser-induced CVD apparatus with a direct pattern writing ability by a pyrolytic decomposition of SiH 4 has been developed. With this equipment, a CW argon laser with an output power of 20 W was used. The argon laser beam, which provides localized heating of the substrate, was utilized to decompose gas-phase m…
Electron microscope studies of as-ultraquenched and subsequently crystallized isotactic polybutylene (PB) are described in this paper. Cold shadowing of the as-quenched samples reveals no distinct structure larger than 30 Å in the amorphous PB. When rapidly warmed to room temperature PB crystallizes as microcrystals o…
Despite the availability of several commercial suspension formulations of metronidazole benzoate, there is no official method for its analysis. The conventional analytical method requires extensive extraction following each extraction with evaporation then non-aqueous titration with perchloric acid. The method is time…
011-in-glycerol/water emulsions at various ratios of water to glycerol in the external phase were prepared with Tween 80 and either light mineral oil or soybean oil. A minimum in the droplet size was observed at about 15% w/w water in the external phase of the emulsions. At the same water concentration, a clouding of…
Detailed investigations of the pyroelectric and dielectric properties were performed on PbZrO3 single crystals grown from PbO + ZrO2 + PbF2 + B2O3 flux. Virgin samples possessed a spontaneously developing transient phase. The influence of space charge polarization, in particular connected with the special role of vaca…
Transformation‐range viscosity and thermal expansion measurements were made for five series (Li‐Na, Li‐K, Li‐Cs, Na‐Cs, and K‐Rb) of mixed‐alkali borate glasses containing 30 mol% total alkali oxide. In each case, negative deviations from additivity were observed in the isokom and glass transformation temperatures. Po…
Structural parameters determined for crystalline iron, fayalite and aegirine agree closely with X-ray crystallograhic data. A glass of NaFeSi2O6 composition has Fe predominantly present as Fe3+ in tetrahedral coordination i.e. as a network former. CaFeSiO4 and CaFeSi2O6 glasses have about 1/3 of the total Fe in octahe…
The behavior of isoprene and styrene polymerizations initiated by the complex of n-butylsodium and n-,s-dibutylmagnesium (sodium tributylmagnesiate) has been examined. The styrene-benzene system was found to yield stable active centers and polymers of predictable molecular weight and narrow molecular weight distributi…
Parabariomicrolite _BaTa401O(OHh.2H20 is rhomb,9hedral, spac~ group R3m, with a 7.4290(6), c 18.505(2) A, V 884.5(1) A, Z = 3. The ~trongest six lines in the X-ray powder pattern [d in A(I)(hkl)] are 6.18(50)(00.3), 3.172(65)(02.1), 3.085(41)(00.6), 3.040(10.0)(20.2), 2.641(50)(02.4), 1.591(42)(22.6). Electron-micropr…