Materials Literature
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The statistical theory of paramagnetic clusters described in the literature to date is largely restricted to ``spin-only'' magnetism for which orbital angular momentum is quenched, or enters the calculations only as a trivially modified g factor. This paper discusses the extension of the theory to magnetic ions for wh…
The thermal conductivity of vitreous Si${\mathrm{O}}_{2}$, Se, and silica- and germania-based glasses has been measured between 0.05 and 100 \ifmmode^\circ\else\textdegree\fi{}K. Comparison with earlier work on noncrystalline solids shows that they all have the same conductivity within a factor of 5 over the entire te…
The Raman scattering spectrum of V${\mathrm{O}}_{2}$ is reported between 4.2 and 600\ifmmode^\circ\else\textdegree\fi{}K. In the semiconducting monoclinic phase only sharp phonon structure is observed. The metallic rutile phase exhibits a pronounced softening and damping in the observed phonon spectrum. This evidence…
Significant swelling (1 to 10 percent due to small voids have been found in stainless steel when it is exposed to fast neutron doses less than expected in commercial fast breeder reactors. The main features of this new effect are: (i) the voids are formed by the precipitation of a small fraction of the radiation-produ…
The diffraction of plane electromagnetic waves by ideally conducting bodies, the surface of which have discontinuities, is investigated in the report. The linear dimensions of the bodies are assumed to be large in comparison with the wavelength. The method developed takes into account the perturbation of the field in…
Accuracy of the beam-bending method used in viscosity measurements of glass is determined by using electric-melting fused quartz. Average viscosity of ten specimens is obtained as (5.96±0.16)×10 12 poise at 1200°C with the standard deviation of 8%. Limits of specimen dimensions applicable in this method is determined…
Abstract Potassium is deposited as kainite and/or carnallite by solar evaporation of sea and inland bitterns, respectively. The solubility of this natural kainite in water was found to be at 20 g magnesium chloride per 100 g water as against at 27.5 g obtained with synthetic kainite. As a result, the equilibrium data…
Summary Yttrotungstite occurs at Kramat Pulai mine, and at Tapah, Kinta, Perak, Malaysia, as yellow earthy material and as monoclinic laths, elongated along [001], flattened, and always twinned, on {100} to pseudo-orthorhombic symmetry, and frequently bevelled by {110}; crystals are very rarely terminated by {101}. γ…
The research was for the purpose of developing equipment for investigating the static and dynamic stress-strain properties of large-sized granular materials. In addition a limited number of static and dynamic test results are presented on various general backfill materials from three missile sites in the United States…
Abstract The cure properties of thiocarbamyl amine disulfide (I) as vulcanizing agents are influenced by the ionic and steric nature of both R and R′. The relative effects of various R and R′ are analogous to those of R and R′ in thiuram disulfides and dithioamines, respectively. However, the cure properties of I are…
"Hunting," or small random excursions of the rotor, in synchronous motors may cause objectionable time-displacement errors in video headwheel drives and other precision scanning systems. The idealized model of the hunting motor is seen to be a simple second-order linear system. Hysteresis motors behave very much like…
Abstract The rate constants for electrochemically initiated polymerization were determined by employing a pulsing technique. An electrochemical titration was conducted in which polymer chains were initiated electrochemically, propagated in the absence of current, and terminated electrochemically. The concentrations of…
Abstract Ionic conduction in continuous polymer films is of two types. Inverse conduction occurs when the resistance of the film runs counter to, and direct conduction when the resistance follows, that of the external solution. The effect of pigmentation with iron oxide on the type of conduction has been examined in t…
Abstract It has been demonstrated that Raman spectroscopy can be used to follow changes that occur in the network of vulcanizates as a function of cure time. In the system studied we have found that dialkenyl sulfides, cyclic sulfides and conjugated triene structures parallel the cure. In other words, the Raman lines…
The diffusion of iron in aluminium has been recently investigated using ion-implantation and tracer-sectioning method. It has been contended that due to the probable presence of an oxide layer on an aluminium surface, measurements of solute diffusion data by conventional plating and sectioning method give rise to ‘ano…
Abstract Die Hexacyanochromate(III) von Li + , Na + , K + , Rb + , Cs + , NH 4 + , [(C 4 H 9 ) 4 N] + , [(C 6 H 5 ) 4 P] + , [(C 6 H 5 ) 4 As] + und Tl + wurden präpariert und röntgenographisch vermessen. In den Remissionsspektren wurde eine bisher unbekannte Elektronenüberführungsbande bei 45 kK gefunden, die in eini…
Abstract The electronic structures of trans ‐ and cis ‐stilbene are calculated using Pariser and Parr's semiempirical method. The resonance integrals are adjusted so as to give the best agreement with the spectroscopic data. In addition, the potential surfaces of various excited states in stilbene during its isomeriza…
18Ni 180 and 18Ni 200 maraging steels have shown high resistance to stress corrosion cracking in sea water. U-bends had no cracks after exposure for over three years. 18Ni 180 welds also had good resistance, but welds in the 18Ni 200 grade suffered stress corrosion cracking. Cathodic protection of U-bends was benefici…
The dissolution of dicalcium phosphate dihydrate has been studied by following changes in the calcium, phosphate, and hydrogen ion concentrations when undersaturated solutions are inoculated with seed crystals of the salt. The rate of dissolution follows an equation of the first order with respect to concentration; th…
A degenerate excited state is essential to the description of structural rearrangements which account for the relaxational heat capacity, thermal expansion, and compressibility of vitreous B2O3. These relaxational responses cannot be simultaneously described by a two-state model, or by any model involving a single ord…