Materials Literature
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We have investigated phosphorescence, thermoluminescence, and photostimulated luminescence in manganese activated zinc silicate phosphors, both with and without arsenic doping. Both phosphorescence and photostimulated luminescence intensities are found to decay as the reciprocal of the time, a result which requires a…
Observed 7-eV satellites in the x-ray---photoemission spectra of U${\mathrm{Ga}}_{2}$ and other $B$-group compounds are shown to be due to two-hole final states as confirmed by existing Auger data. The presence of these satellites is an indication for a weak $\mathrm{fd}$ hybridization and, when compared to uranium---…
Detailed polarised Raman spectra have been recorded at 300K of single crystals of the layered compound (NH 3 (CH 2 ) 2 NH 3 )CdCl 4 . The Raman-active external and internal modes associated with the linked layer-forming CdCl 6 octahedra and the cation chains, have been assigned on the basis of the polarisation data, m…
Abstract Oxidmischkristalle vom Perowskit‐Typ wie z.B. La, ‐xCaxYO3 ‐a oder Srlrog ° In0‐1O3 ‐o, besitzen, wie qualitativ mit einer elektrochemischen Methode bestätigt wird, in H, ‐Atrnosphäre bei hohen Temp. Protonenleitfähigkeit.
Abstract The literature on the corrosion of copper alloys in seawater published from 1975 to-date has been reviewed. The main topics covered are (i) the formation and nature of protective films (ii) velocity considerations (iii) corrosion in clean and polluted seawater with particular reference to sulphide pollution (…
Abstract In view of the increased frequency of grooving corrosion in electric resistance welded(ERW) steel pipes used for water pipes, case histories and factors affecting its occurrence have been investigated. Two types of grooving corrosion are observed in 68 case studies of troubled pipes, the continuous and discon…
The geometric structures of the clean 2\ifmmode\times\else\texttimes\fi{}1 reconstructed and the hydrogen-stabilized (1\ifmmode\times\else\texttimes\fi{}1)2H Si(100) surface have been studied by means of ion channeling and blocking. The latter surface appears to be contracted by 0.08\ifmmode\pm\else\textpm\fi{}0.03 \A…
An alternative [2] generalized Nyquist stability criterion is proposed for L2systems. It is shown that the properties of a system transfer function matrix\hat{G}(s)associated with its invertibility in the restricted space of transfer function matrices can be deduced from simple encirclement conditions in the complex p…
Abstract The reaction at the interfacial region of Cu/SiO 2 and Fe/SiO 2 heated in the high vacuum of an ESCA spectrometer has been studied. Copper spread slightly into SiO 2 at 500–800°C in the metallic oxidation state. Cupric oxide formed on SiO 2 changed to cuprous oxide or cuprous oxide plus copper metal and sligh…
The rare-earth oxysulfide La10S14O, doped with cerium, emits a bright luminescence band peaking around 6350 Å at room temperature. This red emission is quenched by copper impurities inadvertently present in insufficiently purified La10S14O. The Cu impurity in turn brings forth an emission band peaking around 7200 Å. T…
The paper describes the development and application of a hot-line insulator tester for the detection of defective suspension insulators. Concern over the quality of porcelain insulators and increasing line outage rates has renewed interest in programmed field testing of insulators. Field tests identified a need for a…
Brillouin scattering spectra of perovskite-type crystal CsPbCl 3 have been measured above its cubic-tetragonal phase transition temperature, T c =47^° C . The three elastic constants c 11 , c 12 and c 44 were determined in a wide temperature range. The result agrees quite well with that of the previous ultrasonic meas…
A series of polyoxamide homopolymers and regular copolyoxamides was prepared by liquid-liquid interfacial, gas-liquid interfacial, and solution polycondensation techniques. Thus, poly(hexamethylene oxamide) {Nylon 62}, poly(ethylene oxamide) {Nylon 22}, and poly(p-phenylene oxamide) were prepared in moderate molecular…
NMR and magnetization were measured at 4.2 K for Mn 2 VAl with the L2 1 structure. The 27 Al, 51 V and 55 Mn NMR signals were observed by the spin echo technique in zero external field at 28.2, 71.5 and 104.2 MHZ which correspond to the hyperfine fields of -25.4, -63.9 and -98.7 kOe, respectively. The saturation magne…
The extent of fracture of anodic oxide films during tensile deformation of aluminum is shown to be controlled by the density of defects in the oxide. The density of defects was monitored by the “leakage” resistance of the film, while the extent of fracture of the oxide was obtained from measurements of reanodization c…
Reinterpretation of the neutron diffraction study of 2H–TaSe2 by Moncton, Axe and DiSalvo (1977) reveals an ambiguity in the sense of the displacements proposed for the commensurate superlattice structure. We attempt to resolve this ambiguity by electrostatic and short-range energy calculations of the phase dependence…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUNIFAC group contribution method for silicone compoundsMordechay Herskowitz and Moshe GottliebCite this: Ind. Eng. Chem. Process Des. Dev. 1981, 20, 2, 407–409Publication Date (Print):April 1, 1981Publication History Published online1 May 2002Published inissue 1 April 1981ht…
The ${c}_{55}$ elastic constant of K${\mathrm{H}}_{3}$${(\mathrm{S}\mathrm{e}{\mathrm{O}}_{3})}_{2}$ and K${\mathrm{D}}_{3}$${(\mathrm{S}\mathrm{e}{\mathrm{O}}_{3})}_{2}$ has been investigated by Brillouin scattering in the vicinity of the ferroelastic transition in free crystal and under applied uniaxial stress. At z…
Abstract The kinetic equation for the pyrolysis gasification reaction of isotactic and atactic polypropylenes has been established. The difference in tacticity of the samples does not much affect the kinetic parameters. The exponent a of the intensity function I F = T δ a (K·sec a ), concerning the severity of decompo…
A hyperscaling relation v″ + 2v┴ = 2 – α is examined for the nematic to smectic A transition of 4-octyloxy-4′-cyanobiphenyl (8OCB) and 4-octyl-4′-cyanobiphenyl (8CB). From the heat capacity results, 2-α is analyzed to be 1.84 ± 0.03 for 8OCB and 1.75 ± 0.02 for 8OCB. On the other hand v″ + 2v┴ is calculated from the r…