Obtaining high-purity fused refractory oxides

Conclusions Using yttrium oxide and aluminum oxide as examples we demonstrated the possibility of successfully using the induction heating method in a cold crucible for obtaining fused refractory materials possessing a high purity. The contamination of the charge by the crucible material during melting does not exceed 10^–3%.Translated from Ogneupory, No. 7, pp. 26–29, July, 1973.     

The peculiaries of the nutrition and immune status of people in the condition of penitentiary establishment

The decrease of calorie in ration content, insufficient consumption of proteins and lipids was found among the patients in the condition of penitentiary establishment, it results in decrease of characteristics of natural immunity and resistibility to various infections agents, to the action of toxic substances, stress and other negative conditions that take place in penitentiary establishment a disbalanse of regulatory subpopulation of cellular consistent of immunity and predominance of suppressive-cytotoxic influence was observed among the patients of the penitentiary establishment (with a reduced ration of nutrition) over halt a year. Considering a health problem, in the establishments of imprisonment one may probably state that a reduced ration of nutrition is one of the main courses of immune homeostasis shift leasing in the basis of specific and non-specific phenomena of morbidity.     

Formation of 2H-Modification Graphite in Films Deposited with the Use of Nanosecond Laser Pulses

A possible physical model of formation of the wurtzite phase of graphite in the crystallized regions of an amorphous diamond-like carbon film deposited on a glass substrate, heated in advance to a temperature of 473 K, in a vacuum as a result of the exposure of a graphite target to a laser radiation of energy density q = 3.15·10⁴ J/m² is proposed.     

The 1.5-GeV electron synchrotron in tomsk polytechnic institute

A 1.5-Gev electron synchrotron is described. The synchrotron is of the weakfocusing type with a magnetic-field fall-off index of n= 0 58 The machine operates under pulse conditions, with a repetition frequency of 1 cps. The injector is a 5.5-MeV mierotron. A voltage of 240 kV is required to accelerate electrons to 1.5 GeV, and this is designed to be supplied by two resonators. An energy of 1.1 GeV and an acceleratedbeam intensity of 1.2·10¹⁰ particles per pulse was obtained in 1965 on a synchrotron with one resonator.Translated from Atomnaya Énergiya, Vol. 21, No. 6, pp. 435–439, December, 1966.     

Rapid Crystallization of Refractory Oxides and the Possibility of Formation of a Two-Phase Zone

The results are given of numerical calculations of temperature fields under conditions of free cooling and rapid crystallization of a pool with molten alumina formed as a result of heating a sample by concentrated laser radiation, as well as of effective brightness temperatures corresponding to the radiation leaving the sample. Measurements are performed of the effective brightness temperatures and reflectivity for different wavelengths in the process of cooling molten alumina and zirconia formed as a result of heating ceramics by concentrated laser radiation. Comparison of the calculation and experimental results reveals the important part played by the extended two-phase zone formed in semitransparent oxides in the formation of temperature fields and related thermal-radiation properties.     

Strain-induced magnetization of amorphous ferromagnets

The magnitude of the strain-induced magnetization (ΔB _σ effect) of a Fe_81.5B_13.5Si₃C₂ amorphous ferromagnetic alloy was studied as a function of the applied magnetic field, the frequency of alternating elastic stress, and the thermomagnetic treatment temperature. It is shown that processes involved in the strain-induced magnetization of the alloy studied are determined by the frequency of alternating elastic stress and the thermomagnetic treatment temperature.