Materials Literature
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The optical properties of indium-doped ZnO crystals, with free-carrier concentrations ranging from ${10}^{19}$ to 5\ifmmode\times\else\texttimes\fi{}${10}^{19}$ ${\mathrm{cm}}^{\ensuremath{-}3}$, have been studied at room temperature. The condition of the crystal surfaces has been shown to influence radically the refl…
Binding and migration energies and atomic configurations have been calculated for small vacancy and interstitial clusters in an fcc lattice with a model which should be applicable to nickel. The mathematical model consisted of a spherical crystallite containing about 530 atoms which were treated as individual particle…
Photoemission of electrons from both the conduction and valence bands of $n$-type strongly degenerate silicon (${10}^{26}$ electrons/${\mathrm{m}}^{3}$) into thermally grown silicon dioxide layers has been observed. The threshold energies have been determined for the two processes and are used to obtain the following…
Abstract In Farbstoffmolekülen, die zwei und mehr Polymethin‐Strukturelemente, oder wenigstens ein Polymethin‐ und ein Polyen‐Strukturelement enthalten, treten in der Regel Kopplungseffekte auf, die das spektroskopische Verhalten und andere physikalisch‐chemische Eigenschaften bestimmen. Mit Hilfe der Kopplungskonzept…
The optical absorption spectrum of substitutional ${\mathrm{Fe}}^{2+}$ ions at concentrations from 2\ifmmode\times\else\texttimes\fi{}${10}^{18}$ to 4\ifmmode\times\else\texttimes\fi{}${10}^{20}$ ${\mathrm{cm}}^{\ensuremath{-}3}$ has been studied for cubic ZnS, CdTe, and Mg${\mathrm{Al}}_{2}$${\mathrm{O}}_{4}$ single…
High temperature steady state creep rate analysis of pure Ag and internally ionized Ag-Mg alloys
The stacking properties of {310} planes in body-centred cubic metals and their relation to twinning behaviour are investigated. It is shown that the twinning translation can be produced by a partial dislocation with Burgers vector of the form (α/10)〈513〉. Such partials can be formed by the dissociation onto a {310} pl…
The fiber orientation and fiber breakage were studied in a felt, needled in a laboratory needling machine, and the relationship between degree of needle penetration and felt thickness, density, strength, and air permeability was determined.
Abstract The gelation of vinyl plastisols at constant temperature has been found to follow the equation ln [( C − C e )/( U − C e )] = (− π 2 / a 2 ) D τ + ln (8/π 2 ), where C is the resin phase concentration, C e the equilibrium resin phase concentration, U the critical resin phase concentration, a the average parti…
The bidirectional spectral reflectance of a set of V-grooved surfaces has been investigated in an attempt to separate the influences of the mean slope and the peak-to-valley height. The experimental results show good agreement with the theoretical models in both the geometrical optics and diffraction ranges.
A number of binary systems comprising a liquid crystalline Schiff's base, viz. p-acetoxybenzal-p-phenetidine and a non-liquid crystalline Schiff's base are studied. In all these cases, the liquid phase, be it anisotropic or not, is a single homogeneous phase. There is no indication of two distinct liquid phases, one a…
Dislocation measurements obtained after creep of Fe-3·0% Si by Barrett et al. (1966) have been analysed. It is shown that mean mobile dislocation velocity is linearly related to mobile dislocation density in support of a previous model of creep (Webster 1966). Furthermore, the creep curves calculated using these resul…
Abstract Stress relaxation experiments were carried out in a dry nitrogen atmosphere on polydimethylsiloxane and an ethylene‐propylene terpolymer. Relaxation times much longer than expected were observed, and plots of In f ( t )/ f (0) versus time were linear in all cases.
Abstract Volcanic gases from several active volcanoes in Japan have been analyzed for iodine and chlorine: Showashinzan (I=0.025–0.20 mg.I/kg.H2O, Cl=238–1830 mg.Cl/kg.H2O), Iwatesan (I=0.053–0.19, Cl=2720–3360), Issaikyoyama (I=0.030–0.087, Cl=104–213), Nasudake (I=0.16–3.9, Cl=188–9460), Yakedake (I=0.58–0.93, Cl=12…
1. Euplotes daidaleos n. sp. is described as a hitherto unrecognized species. It is a fresh-water form found in Philadelphia, Pa., and appears to be closely related to E. patella, differing from it in shape and size, in the possession of zoochlorellae and possibly in the structure of the peristome. 2. Diagnostic chara…
Abstract The kinetics of the anionic polymerization of octamethylcyclotetrasiloxane (D 4 ) initiated by α‐methylstyrene living polymer in tetrahydrofuran was studied. The following kinetic scheme was postulated: Initiation: equation image Propagation: equation image where S ‐ and M represent the initiator and D 4 , re…
A detailed study was made of the effects of yarn friction on the magnitude of the tensions developed in the knitting zone of the standard weft-knitting machine and the in fluence of these tensions on loop formation and fabric quality. Variations in loop length of ±10% due to changes in yarn friction may be experienced…
Thirteen p-n-alkoxybenzylidene-p-aminobenzoic acids were prepared and their mesomorphic transition temperatures were determined. They exhibit mesophases of greater relative thermal stability than the p-n-alkoxybenzoic and p-n-alkoxycinnamic acids but 4′-n-alkoxydiphenyl-4-carboxylic acids exhibit greater thermal stabi…
A new instrumental method for the analysis of the stress-strain behavior of fabrics in shear has been designed which utilizes the Instron and its automatic recording. It is similar in principle to the laboratory method previously employed by Treloar. A cotton and a spun viscose fabric were investigated for their depen…
Abstract The crystal structure of the α polymorph of nylon 4 has been determined from the x‐ray diffraction patterns of uniaxially oriented monofilaments. In general the crystal structure of α nylon 4 is similar to that of α nylon 6. The unit cell is monoclinic with the following dimensions: a = 9.29 ± 0.05 A., b = 12…