Materials Literature
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If an obstacle exists in the vicinity of the free surface of a half-space and a stress field is applied in such a manner that dislocations are pushed towards the obstacle, an array of dislocations then piles up into an equilibrium distribution against the obstacle. The distributions of dislocations are obtained by the…
Abstract The present investigation was undertaken in an attempt to determine the role played by the nerve in the regeneration of the lower jaw of the adult newt, Triturus viridescens . The results indicated that the number of nerve fibers normally available at the amputation surface was very low compared with that of…
Abstract Samples of white soft paraffin complying with pharmacopoeial requirements vary in their physical properties. Some samples produce hard waxy lumps and permit excessive separation of liquid components (bleeding). Measurement of melting and congealing points and consistency by penetrometer failed to reveal these…
The mineral phases and the distribution of major, minor and trace elements in the clays and bed rocks of two bore-holes at Adda and Chaubatta of the Birbhum area have revealed an intimate relationship of the kaolin-rich clays with the bed-rock of Adda. The possibility of a common origin for the clay deposits at Chauba…
Measurement of difference in amplitude of components at about 51.75 degrees and 51.40 degrees 2theta (Co Kalpha radiation) of the asymmetric X-ray diffraction peak resulting from partial superposition of strong diffractions from corresponding planes in hexagonal and monoclinic pyrrhotite structures allows rapid quanti…
A new technique, based on the nuclear activation reaction 15 N(α, n) 18 F, was used to measure nitrogen self‐diffusion coefficients in UN. Temperatures were 1700° to 2000°C and N 2 pressures 7 to 603 torr. The diffusion coefficients were in fair agreement with those obtained by the gaseous exchange method in an indepe…
Optical absorption spectrum measurements and spectral details are presented together with transition assignments and other interpretations for a lemon-yellow gem-quality specimen of iron-rich orthoclase. Only three principal bands--26500, 24000, and 22600 cm (super -1) --are resolved in the spectrum and are tentativel…
New taxa are described as follows: Ralfsia confusa sp. nov., Ralfsia integra sp. nov., Pseudolithoderma nigra sp. nov., Diplura simulans gen. et sp. nov., Endoplura aurea gen. et sp. nov. Lithodermataceae is included in Ralfsiaceae. An emended description of Ralfsia californica is given. Distributional records are als…
A simple homogeneous-field magnetic prism spectrometer is described for use below the camera chamber of a conventional transmission electron microscope. The prism is designed for point-to-point focusing from the exit pupil of the electron microscope to the exit slit of the spectrometer. Energy spectra are scanned by v…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInvestigation of the structure of the pyrosulfite ion in aqueous solution using Raman and infrared spectroscopiesAlbert W. Herlinger and Thomas Veach Long IICite this: Inorg. Chem. 1969, 8, 12, 2661–2665Publication Date (Print):December 1, 1969Publication History Published o…
Abstract Magnesium carbonate powder and granules were compressed and the tablets characterized by their permeability to air and penetration by liquids. To the same materials, magnesium stearate was added, its distribution being varied by varying its concentration, the size of the base material and the method of mixing…
The family of spinel compounds of which CdCr2Se4is the prototype has been found to be simultaneously ferromagnetic and semiconducting. Numerous experiments reveal, moreover, that the electronic states in these materials are strongly coupled to the degree of magnetic order. The interaction between the electronic transp…
Abstract Montmorillonite was found to be the dominant clay mineral in surface horizons of certain soils of the North Carolina Coastal Plain whereas a 2:1–2:2 intergrade clay mineral was dominant in subjacent horizons. In all soils where this clay mineral sequence was found, the surface horizon was low in pH (below 4·5…
Equilibrium sorption, permeation, and sorption kinetic measurements have been made for water in polydimethylsiloxane rubbers containing various amounts of either sodium chloride or silica filler. In general the addition of filler leads to an increase in the uptake of water by the rubber. On the other hand, the permeab…
A single-channel pulse-height analyzer with suitable pulse-shaping circuits designed for partial-discharge measurements is described. The circuit of the pulse-height analyzer has a basic resolution limit of 1.5 μs. The unit may be used in conjunction with an RLC-type partial-discharge-detection circuit and is thus app…
Abstract Differential thermal analysis and electron microscopy of partially molten, extended‐chain polyethylene crystals, grown under elevated pressure, was performed. It could be shown that melting peaks on the low temperature side of the main melting peak are due to narrowly distributed, low molecular weight polymer…
This paper introduces a simple method for objectively analysing the arrangement of beds in sequences of alternating rock types. The number of times that different lithologies overlie one another in a section may be recorded in a table, termed the data array. The probability of one lithology overlying another in a sect…
Iron single crystals with the [100] and [110] axes were extended at 23°C and -78°C and examined by transmission electron microscopy using thin foils cut parallel to lattice planes. In the initial state of deformation, screw dislocations and edge type loops were observed predominantly. Two-dimensional tangles of disloc…
The Cl, Cs, and H nuclear magnetic resonance are used to examine the magnetic structure of antiferromagnetic Cs Mn Cl3·2H2O. The magnetic space group is P2bc′ca′, and the structure consists of eight sublattices with the sublattice magnetization along the b axis. The linear chains invoked by other authors to explain th…
The second paper in this series casts the Boudreaux-Heine method of calculating low-energy electron diffraction (LEED) intensities into a matrix form suitable for extension to complicated surface structures. Calculations are made for the 00 and 01, macron beams reflected from a nickel 111 surface, for norrmal incidenc…