Materials Literature
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Abstract Precision measurements of the angular dependence of the de Haas-van Alphen frequencies F (proportional to extremal areas of the Fermi surface) of the noble metals have been made, using the technique of following the oscillations in magnetic properties as the crystal is slowly rotated in a fixed magnetic field…
A method is proposed for calculating elastic and inelastic three-particle scattering amplitudes in the breakup region using a coordinate-space variational approach, with each coordinate multiplied by a complex phase factor. The trial wave functions have relatively simple asymptotic forms. The method applies to short-r…
After being injected with collagen from rat or guinea pig skin, rabbits form high titer, species-specific antibodies to collagen. Antibody is directed primarily against the alpha2 chain of collagen with little reaction with the alpha1 chain. The amino terminal peptide of cyanogen bromide cleavage of the alpha2 chain o…
Abstract The rate of the reaction of a series of phosphites with cyclohexene hydroperoxide and cyclohexene peroxy radicals was studied. The results of the measurements were compared with the stabilization efficiency of the same compounds in isotactic and in atactic polypropylene at 160°C and 120°C respectively and dur…
The frequencies of the optical phonons in NaCl${\mathrm{O}}_{3}$ have been located by measuring the infrared reflectivity and the Raman scattering spectra. By using the Lyddane-Sachs-Teller relationship, a value of 5.6 was found for the static dielectric constant. Dielectric transition strengths were determined from t…
Magnesium oxide powders obtained from three sources exhibit strikingly different infrared absorption spectra. These differences are correlated herein with variations in the size and shape of the particles in the powders, and are interpreted in terms of both Fr\"ohlich-type (surface) modes and classical electromagnetic…
Optical second-harmonic generation has been observed in crystals of six organic dyes. One dye, 7-diethylamino-4-methylcoumarin, appears to be at least as good a frequency doubler as LiNbO3 and has a much higher resistance to surface damage.
A sharp peak in the two-phonon Raman spectrum of diamond was first observed by Krishnan and has recently been shown to be at a frequency higher than twice the maximum single-phonon frequency by Solid and Ramdas. We interpret this peak as evidence for the existence of bound states of the two-phonon system. The repulsiv…
X-ray photoelectron spectra indicate core-electron binding-energy splittings of \ensuremath{\sim}6 eV for the $3s$ levels in Mn${\mathrm{F}}_{2}$, MnO, and Fe${\mathrm{F}}_{3}$, and less pronounced effects on the $3s$ levels in Mn${\mathrm{O}}_{2}$ and Fe metal. These splittings are considerably reduced from free-ion…
A first-order metal-insulator transition at room temperature has been found in Cr-doped ${\mathrm{V}}_{2}$${\mathrm{O}}_{3}$ as a function of both Cr concentration and pressure. This is shown to be a Mott transition in which the conduction electrons localize to form the insulator. A generalized phase diagram relating…
p-Chlorophenylalanine depletes brain serotonin and induces longlasting sexual excitation in male rats. The effect of p-chlorophenylalanine is potentiated by pargyline. Administration of 5-hydroxytryptophan to rats treated with p-chlorophenylalanine plus pargyline blocks the sexual excitation. p-Chlorophenylalanine als…
${\mathrm{Ca}}_{2}$Mn${\mathrm{O}}_{4}$ shows anomalous magnetic-susceptibility behavior rather similar to that of the isostructural fluoride ${\mathrm{K}}_{2}$Ni${\mathrm{F}}_{4}$, in which the existence of long-range two-dimensional character has recently been clearly demonstrated. A powder-diffraction study of ${\m…
Measurements have been made of the photoelectric yield and the photoelectron energy distribution curves (EDC's) on Na and K in the photon energy range 2.3-11.6 eV. The samples were thick films prepared by evaporation onto various substrates in a specially constructed ultrahigh vacuum chamber. The results are interpret…
Article A reinvestigation of the crystal structure of ammonium persulfate, (NH4)2S2O8 was published on December 1, 1969 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 130, issue 1-6).
The idealized geometry of a looped-pile carpet is analyzed. Mechanisms of deformation are outlined, and the limiting conditions for each mechanism are discussed. Expressions are derived for both the initial and final geometries of the loop. Strain levels in the fibers in a deformed carpet are predicted, and the result…
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…