Behavior of Aluminum in Its Electric-Spark Dispersion in Aqueous Solutions of Some Acids

The influence exerted by the nature and concentration of a number of organic and mineral acids on the composition of products formed in electric-spark dispersion of aluminum was studied.     

Spark Dispersion of Aluminum and Its Subsequent Hydration

The influence exerted by components introduced into the working solution and by the temperature of sludge treatment on hydration of dispersed aluminum particles formed in the course of spark erosion was studied.     

Statistical characteristics of the spatial structure of scattered radiation

Experimental results are given on the statistical characteristics of the spatial structure of scattered radiation as a function of the optical thickness and the number of scatterers. It is shown that the dispersion of the intensity fluctuations decreases with increase in the particle concentration in the scattering volume, and the correlation radius increases with increase in optical thickness. The dependence of the intensity-fluctuation dispersion on the scattering angle is obtained.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 12, pp. 44–47, December, 1978.Finally, it remains to thank Yu. A. Larionov, the head engineer of the Siberian Physicotechnical Institute, for assistance in the analysis of the experimental data.     

Unbiased estimation of linear functionals in the case of inverse normal distribution

Unbiased estimators are constructed for density and linear functionals of the above-cited distributions.Translated from Statisticheskie Metody Otsenivaniya i Proverki Gipotez, pp. 11–15, 1988.     

Influence of copper impurity and structure defects on the properties of compound CdSnAs2

A study was made of the mechanisms of formation and interaction of impurities and intrinsic defects in CdSnAs₂ crystals during diffusion doping of this compound with copper and during subsequent low-temperature (300°C) annealing. This was done by diffusing copper into samples with different initial defect structure under conditions of controlled arsenic vapor pressure and applying the method of quasichemical reactions to analyze the experimental data. It was found that the special features of the physical properties of n-type CdSnAs₂:Cu crystals — the low density and high mobility of electrons-were due to the high reactivity of copper resulting in binding of the original crystal defects to form neutral complexes. It was found that the anomalous annealing of CdSnAs₂: Cu samples, resulting in n-p conversion of the type of conduction, was associated with precipitation of a solid solution of an accidental donor impurity (most probably oxygen). The diffusion doping with copper was found to be one of the most effective methods for controlling the properties of CdSnAs₂, particularly in the preparation of high-resistivity crystals.Translated from Izvestiya Uchebnykh Zavedenii, Fizika, No. 5, pp, 102–108, May, 1980.     

Electro-physical properties of cadmium-silicon diarsenide irradiated by H<Superscript>+</Superscript> ions

The effect of proton irradiation (E = 5 MeV, D = 2 · 10¹⁷ cm⁻²) on electro-physical properties of p-CdSiAs ₂ crystals is studied. The irradiation resulted in semi-insulating CdSiAs ₂ samples with the Fermi-level position in the proximity of E_g/2. The energy position of a “neutral” point is calculated for CdSiAs ₂, and thermal stability of radiation defects is investigated. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 8, pp. 12–15, August, 2007.