Materials Literature
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The flow transients as initiated by rapid gas release are studied both experimentally and analytically. The mathematical model developed considers a multiple pin failure in a fast-reactor subassembly. In formulating the model, it is assumed that the released gas fills the subassembly cross section uniformly and that t…
Abstract Large hydrothermal deposits of halloysite clay occur in the Terraced Hills, Washoe County, Nevada and similar bodies probably are present elsewhere in the Basin and Range province. The host rock, an andesitic tuff, is underlain and overlain by volcanic flows; all these rocks are late Miocene to Pliocene in ag…
An analysis was made of the pressure distribution inside a tensioned, twisted fiber assembly. As a result of this analysis, three different expressions for the pressure, each resulting in the same average value for low twists, are obtained. Any of these expressions can be used to calculate the drafting force of a rela…
Abstract The correct figures for Fig. 1 (p. 3468) and Fig. 2 (p. 3477) are given below : FIG. 1. Elution profile of the peptic peptides of unoxidized T4 at phage lysosyme (80 mg) on a Dowex 50-×2 column (0.9 × 150 cm). Elution was carried out with a gradient of pyridine-acetate buffer established by means of a nine-ch…
The experimental conditions necessary for the resistometric detection of the pressure-induced bismuth III-IV transition are given and a value of 42·7 kilobars obtained for the start of the transition. The resistance-pressure characteristic shows the shape of the forward transition. A short discussion of recent crystal…
A method, applicable using either the transmission Kossel or divergent X-ray beam techniques, is described in detail. Calculations have shown that its greatest sensitivity corresponds to the lattice parameter region slightly less than that of pure α-iron. Its most useful applications should thus be for the study of α-…
Abstract Eight species of Pycnogonida collected by University of Canterbury Expeditions and the New Zealand Oceanographic Institute are recorded from the Snares Islands, which lie at 48° 05’ S, 166° 20’ E, 60 miles SW of South Cape, Stewart Island. The following species are recorded: Pallenopsis obliqua (Thomson, 1884…
Summary The local development of strongly oxidizing conditions during crystallization of a recent basalt lava lake on Piton de la Fournaise, Réunion, led to the production of approximately 15 % residual rhyodacite liquid. This was segregated into the vesicle cavities as the lava solidified, and congealed as a glass co…
Observations are reported here on the compressive creep behavior of pore-free translucent polycrystalline MgO) containing approximately.0.25 vt% Li, whose density is approximately 99.4% of theoretical density on the basis of single crystal ;MgO.The Li is believed to be in a fluoride-rich phase alo.rig the grain bounda…
Photographic grains do not always behave like Poisson-distributed disks, as the random-dot model assumes. Because real grains cannot occupy the same space at the same time, they crowd one another out at high densities, imposing constraints on their locations, which, consequently, cannot be completely random. The theor…
Abstract An adiabatic calorimeter for the measurements of heat capacities of solid and liquid in the temperature range 80–550 K and the automatic temperature control system are described. The working platinum resistance thermometer is calibrated against a standard thermometer. The measurements of heat capacity of α-Al…
Abstract A structure model of κ′-Al2O3 has been obtained by means of X-ray powder diffraction data. An hexagonal unit cell with a=5.544 and c=9.024 Å and containing 5\frac13 A2O3 was assumed. The oxygen arrangement is the same close packed structure as that of tohdite, and 10\frac23 aluminium atoms are statistically d…
The erosion of synthetic insulating materials by surface discharges constitutes an important problem in the application of these materials for high-voltage outdoor applications. A method of erosion testing is described that simulates the heat flux from surface discharges by radiant energy from a thermal imaging source…
The synthesis and crystal chemistry of six new complex palladium oxides are described. The black PbPdO 2 has been tentatively indexed on a hexagonal basis with a 0 = 10.902A and c 0 = 4.654A. Sr 2 PdO 3 is body-centered orthorhombic with a 0 = 3.970A, b 0 = 3.544A, and c 0 = 12.84A; the structure proposed for this com…
Abstract Native celluloses of various biological origins, as well as regenerated celluloses were examined by electron microscopy after suitable dispersion. In all cases the specimens were found to be composed of a common filamentary unit which is rectangular in cross section and has the approximate dimensions 35 × 20…
The photoelectric yield and photoelectron energy distributions have been measured on Rb and Cs in the photon energy range 2. 0-11. 2 eV. These results and the trends across the series Na, K, Rb, Cs are compared with the predictions of the three-step volume model. The energy distributions show evidence of scattering by…
The defect structure in α-titanium and rhenium irradiated with neutrons at 0.4T m (T m = absolute melting temperature) has been analyzed using transmission electron microscopy. In rhenium, the vacancies agglomerate into voids whereas in titanium, vacancy dislocation loops lying on the prism planes are the only vacancy…
Abstract— Octaethylporphinato‐magnesium (MgOEP) has been photooxygenated in quantitative yield to a brown compound with its main absorption peaks at 825 and 408 nm. The product has been isolated and evidence suggests that it is 4‐formyl‐5‐oxa‐octaethylporphinato‐magnesium II. II is very labile to hydrolysis, the main…
Dihydrolipoyl transsuccinylase, one of the three enzymes comprising the Escherichia coli 2-oxoglutarate dehydrogenase (EC 1.2.4.2) complex, has been crystallized. Studies by x-ray diffraction and electron microscopy establish that the transsuccinylase has octahedral (432) symmetry, i.e., it consists of 24 subunits tha…
Abstract Studies have been made of the secondary relaxation processes in the solid state of a number of polymers containing aromatic groups in the polymer chain. The polymers investigated include one, polystyrene, with the aromatic group in side‐chain positions, and six high polymers in which phenylene rings lie in th…