Materials Literature
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Anion self-diffusion has been studied in PbBr2 and AgBr using an isotope exchange technique. In addition the diffusion of Pb in PbBr2 has been measured using 210Pb as tracer and a chemical sectioning method. The effect of bromine gas pressure on anion diffusion has been examined for both materials. In the case of PbBr…
The effect of various sewing conditions and needle characteristics on the temperature observed during high speed sewing has been studied. The maximum needle temperatures were determined by means of infrared (ir) flux measurements. A complete statistical experiment was used to show the effect of sewing speed, the use o…
The unit Burgers vectors of perfect grain boundary dislocations, in near coincidence site lattice (c.s.l.) boundaries, are determined for the case of the b.c.c. and f.c.c. structures. The method of Frank for low-angle boundaries is applied to the determination of the dislocation content of a general grain boundary, an…
The scanned field performance of probe forming systems has been investigated leading to various methods for increasing the current that may be delivered into an electron probe scanning a square field of 104 lines. Programs for evaluating the third-order aberrations of both lenses and single and double deflection syste…
The predominant defects in the fluorite structure are anion vacancies and interstitials. Cation defects occur at a much smaller rate and are therefore more difficult to study. They are, however, of crucial interest since they are rate-determining for many high temperature matter transport processes. Cation diffusion w…
Demagnifying EPS have the capacity to generate as much as 5000 line pairs per diameter at a resolution as small as 0.1 μ. The diameter of the recorded image and the maximum number of line pairs per diameter decrease with increasing values of the chromatic field aberrations of the lens system, and with increasing relat…
An experimental study has been made of magnetic hysteresis in plastically deformed and annealed gadolinium (Gd) metal as a function of annealing temperature. Seven plastically deformed samples were annealed at temperatures ranging from 155° to 916°C; major and minor magnetic hysteresis loops of these seven samples plu…
An analysis of three-dimensional asymmetric field distribution in SF6 gas insulated cables is shown. The equations to be used in the calculation are derived drecty from Gauss' theorem, and this procedure is quite simple. The field problems in the cables with epoxy pole spacers are solved by digital computer. The solut…
The optimization of the performance of a high-brightness electron gun requires the correct choice of material, and LaB6 has been shown to have advantages over pure metal emitters. The finely pointed tip must be accurately positioned in the grid aperture to achieve maximum brightness and the electrode positions must be…
Article The crystal structure of magnesium paratungstate, Mg5H2W12O42-38H2O was published on November 1, 1973 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 137, issue 1-6).
A new high-resolution electron probe has been built for scanning microscopy studies. The probe has a final lens with a focal length of 0.8 mm, a spherical aberration coefficient; of 0.4 mm, and a chromatic aberration coefficient of 0.5 mm. A lanthanum hexaboride cathode is employed with a maximum brightness of 1.5×107…
Abstract The mucosal protective and antiflatulent properties of polydimethylsiloxane (PMS) alone, or containing free silica have been examined in rats. Both PMS and PMS + 6% silica significantly protected rat gastric mucosa from the irritant effects of aspirin but there was no significant difference between the protec…
Abstract The expressions for matrix elements of spin‐independent operators F and G with the use of Young operators are obtained in the case of arbitrary nonorthogonalized orbital configuration, including both singly and doubly filled orbitals and corresponding to the definite value of total spin. The formulas obtained…
SUMMARY Rabbits given lead acetate, cadmium chloride, or mercuric chloride in their drinking water for 70 days and then inoculated with pseudorabies virus (3 doses, 7 days between doses) as antigen had significantly lower neutralizing antibody titers than did the controls. The titers were determined by the plaque assa…
Twinning has been studied in several samples of VO2 containing in substitution solid solution 0.5 and 2.5 at.% Cr. The twinning is by reticular pseudo-merohedry and it is controlled by the tetragonal pseudo-symmetry of a superlattice obtained from the original monoclinic cell (a ≃ 9.1, b ≃ 5.8, c ≃ 4.5 Å, β ≃ 90°) by…
Abstract The chemistry of the cement‐forming reaction between a fluorine‐containing calcium aluminosilicate glass and aqueous solutions of poly(acrylic acid) has been studied using infrared spectroscopy and classical chemical procedures. It was concluded that calcium, aluminium and fluoride ions were leached from the…
Groups that are a generalization of magnetic groups, and called 'spin groups', are defined. Among the spin groups those called 'spin translation groups' are tabulated and described in some detail. The possible magnetic reflexions of unpolarized neutrons elastically scattered from a single crystal whose spin arrangemen…
S>From joint meeting of the American Nuclear Society and the Atomic Industrial Forum and Nuclear Energy Exhibition; San Francisco, California, USA (11 Nov 1973). See CONF-731101-.
Abstract Methyl oleate was hydroformylated to methyl formylstearate at 120 C and 850–900 psig with a 1:1 mol mixture of hydrogen and carbon monoxide. In the presence of triphenylphosphite, an activated rhodium‐on‐alumina catalyst produced an essentially quantitative conversion in about 40 min. Filtration followed by d…
Abstract Von der monoklinen Modifikation der Verbindung CaGa 2 O 4 wurden Einkristalle dargestellt und ihre Kristallstruktur mit Diffraktometer‐Röntgendaten bestimmt; a = 7,992, b = 8,830, c = 10,585 Å, β = 94,72°, Raumgruppe C —P2 1 /C. Ebenso wie die orthorhombische stellt auch die monokline Modifikation einen weite…