Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
An experimental examination of the spin forbidden transitions of molecular oxygen dissolved in various solvents and in the gas phase reveals the following selection rules governing the intermolecular enhancement of these transitions: (i) Nonheavy atom solvents selectively enhance the 1Δg← 3Σg− transition (factor of 10…
Mixtures consisting of conducting particles dispersed in an insulating medium are considered, and the electrical conduction which can occur by particles touching is related to the proportion of conducting material present in the mix, and its conductivity. It is found that limiting values of conduction can be obtained…
The previous microcoscopic models of photoemission are developed and reformulated in order to include inelastic scattering effects. A general expression is given for the photocurrent and its energy distribution (EDC). The problem of inelastic scattering is more thoroughly discussed in the case of electron-phonon inter…
The valence-band structures of MnO, CoO, NiO, CuO, ${\mathrm{Cu}}_{2}$O, Ni${\mathrm{Cl}}_{2}$, NiS, and KNi${\mathrm{F}}_{3}$ have been obtained by x-ray photoelectron spectroscopy. Band widths and positions are obtained, and are compared with the results of band-structure calculations. Bandwidths for the oxides are…
Between 30 and 290 K the thermal expansion of vitreous silica is shown to be particularly sensitive to thermal history. Values given for the linear coefficient α were determined relative to copper, and existing reference data for copper are discussed. α for silicon has also been measured relative to copper from 55 K t…
The polyhedral inclusions of Thiobacillus neapolitanus have been isolated; they contain ribulose diphosphate carboxylase.
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…