[en] Electron density profile analysis of ionograms recorded at Sanae, Antarctica, during an event in the early morning of 27 July 1979 revealed the following interesting features: (i) A retardation type sporadic E-layer changing to a particle type, the critical frequency and virtual height of which were relatively constant before the substorm onset. (ii) Sporadic E-layers of the auroral type with very high critical frequencies, reaching 8.3 MHz, and lower virtual heights than before, were recorded during the substorm. These phenomena are consistent with overhead electron precipitation of the auroral type

[en] Substitution of the end-member oxide, SiO², in the ternary sodium-borosilicate system diagram was studied. Replacement of SiO² by a combination of CeO² and TiO² was found to produce glasses which, after heat treatment, decomposed into two immiscible microphases of which one is water-soluble. Since the mode of phase decomposition is sensitive to impurities, crucible selection, e.g. Al²O³ or Pt/Rh, is important, as demonstrated by differences in pore size, surface area, water resistance and structure of the insoluble phase for a series of CeO²-TiO² and CeO²-TiO²-Al²O³ glass ceramics. The new materials have a specific surface area of up to 308 m₂/g and a pore radius of between 1.12 and 33.47 nm

[en] It is argued that observation of the strange-particle abundance may lead to identification of the quark-gluon plasma and measurement of some of its properties. Approach to chemical equilibrium and competitive processes in the hadronic gas phase are discussed

[en] The non-equilibrium segregation of carbon and silicon to the surface of a polycrystalline Ni-Cr alloy was studied by means of Auger electron spectroscopy (AES). The surface enrichment in both cases is shown to be diffusion-controlled, with a calculated activation energy of 78 plus minus 3 kj mol(sub-)¹ for carbon segregation in the temperature range 573 to 728 K. The diffusivity of silicon in the temperature range 776 to 876 K is given by the expression D(sub Si) approximately equals to 4.4 X 10⁴exp(-1.83 X 10⁴T(sup -)¹ cm²s(sup-)¹T in kelvin) with an activation energy of 152 plus minus 5 kj mol(sub -)¹

[en] The physical response of lithium flouride dosimeters is a complicated function of absorbed energy. Since there is a poor correlation between the experimental results of different workers, a Monte Carlo program was used to calculate the energy response of LiF-TLD for electron energies from 5 to 20 MeV

[en] Atomic excitations are traditionally obtained through electromagnetic interactions. In particular X-ray excitations have been studied through the Coulomb interaction with charged projectiles. Here we examiine the use of the strong interaction as mediated by the scattering of 30 MeV neutrons to obtain excitations of atoms in which only the nucleus recoils suddenly, i.e. with time constants related to the short range of nuclear forces

[en] The total section for the reaction ⁷Li(d,p)⁸Li has been measured from 0.7 MeV to 3.4 MeV by the delayed counting of the beta-decay of the ⁸Li(T(1/2)=842 ms). The absolute cross section was determined by normalizing these data to the integrated angular distributions measured previously at six energies between 2.0 and 3.25 MeV for the reaction ⁷Li(d,p₀)⁸Li (g.s.), taking into account the cross section for the reaction ⁷Li(d,p₁)⁸Li*(0.98) above the threshold energy of 1.50 MeV. Comparison of these data with the previous six measurements of this cross section, which are in conflict, is discussed. A new value for the half-life of ⁸Li of 837 plus minus 3 ms is proposed

[en] A method is described, by which the energy spectra of precipitating electrons may be deduced from the N-h profiles of sporadic E-layers produced by them. This is applied to the deduction of the electron energy spectra at quarter-hourly intervals from 0000 to 0200 UT on 27 July 1979 at Sanae, Antarctica, during which a magnetospheric substorm occurred. The electron spectra are found to agree well with those observed near Sanae or in its conjugate area by the DMSP-F2 satellite during this period. It is concluded that precipitating electrons were mainly reponsible for the occurrence of the sporadic E-layers, and variations of the energy spectra of these electrons during the storm are described

[en] Excitation functions for the reactions ²⁸Si(n,α)²⁵Mg and ²⁸Si(n,p)²⁷Al leading to the first four excited states of each final nucleus as measured with a neutron energy resolution of smaller than or equal to 30 keV for between energies 12.80 and 16.24 MeV, have been analysed in terms of the Ericson fluctuation theory. The cross-correlation analysis showed that the region studied is one that has many broad, overlapping levels exhibiting good statistical properties and is appropriate for such fluctuation analysis. The correlation widths extracted are in agreement with extrapolation from the results at lower energies

[en] Optimum conditions of measurement and mutual interference limits have been established for the determination of platinum, palladium, rhodium, ruthenium, and iridium by atomic-absorption spectroscopy using electrothermal atomization. The accuracy of the measurement was established by the analysis of a platinum-ore reference material