[en] An anomalously low thermal expansion observable in small particles is attributed to extending effect of the shell. It is shown that the coefficient of thermal expansion of the oxide-film-coated aluminium particles calculated using elastic constants and coefficients of thermal expansion of massive materials agres well with those measured experimentally. The linear dilatation of the shell, its stress to rupture and the values of the structural tension are estimated vs the temperature

[en] Cu1 (chain copper) and Cu2 (planar copper) ion charges located in the lattice near (BaO) layers are determined on the base of the earlier proposed model of the Coulomb (BaO) layer splitting. It is ascertained that in YBa₂Cu₃O_7-y limits, reaching +2 under y -> 0. Cu1 ion charge is close to +2 in YBa₂Cu₄O₈ as well. That means that the chains in the both superconductors are practically electroneutral and copper ions with the charge of > +2 are located only in (CuO₂) planes. 7 refs.; 3 figs

[en] The study has established that reactor radiation leads to a significant increase of interdiffusion coefficients in a Mo-W alloy compared to thermally activated diffusion at temperatures of ~1500°С. Furthermore, a weakening of their concentration dependence is observed. The approximation procedure developed in this work allowed approximating experimental data for each sample using variation of only one parameter. It has been demonstrated that the interaction of molybdenum and tungsten nuclei with fast neutrons as well as with hard gamma quanta may cause the observed diffusion effects.

[en] The results of calculational-theoretical study on the kinetics of gaseous fission products release by various heating regimes of irradiated fuel are presented. The computer code, representing the modified CORSOR code, taking into account the initial stage of the fission products release, is developed on the basis of the high-level model. The results obtained made it passable to give quantitative interpretation of nonmonotonous character of the gaseous fission products release, observed in the experiments by various heating regimes. It is shown, in particular, that the fuel porous structure may cause the appearance of two peaks on the time dependence of the gaseous fission products release rate. The same anomalies may appear by the step-like fuel heating

[en] To prove the use of iradiated wood raw material in animal feedstuff, the variations of amino acid composition in the gamma-irradiated aspen leaves (dose 0-0.9 MGy) and pine trunks, irradiated by accelerated electrons with energy 0.5 MeV (dose 0-1.0 MGy), were studied. It was found that with increasing irradiation dose, the total content of available aminoacids in aspen leaves increased, but in the case of pine trunks -decreased. Simultaneously the total content of fatty acids in irradiated pine wood increased from 1.0 to 1.2%. It is found that at room temperature the irradiated woods samples reacted with ammonia and urea, and the content of bound nitrogen in them increased several times

No abstract available

[en] Phase transformations during heating of hardened VT23 alloy were studied using an x-ray structural camera vacuum attachment. The crystal lattice parameters of β, α'' and α phases were calculated. The stability and temperature of decomposition of metastable phases in VT23 alloy are shown to depend on phase concentration which is determined by prehardening temperature. Redistribution of alloying elements resulting in depleted and enriched areas occurs during decomposition of metastable phases. An α'' phase with high alloying element concentration can decompose within 150-200 deg C according to the mechanism similar to that of reverse martensitic transformation. An α'' phase produced by high temperature hardening is less alloyed, and its decomposition occurs according to the normal diffusion mechanism

[en] The use of permanent lenses (PL) in quadrupolar lepses provides higher economic indices of technological devices and devices of accelerating technique, including quadrupoles. Along with this, the calculation of quadrupole lenses at PL require more advanced methods that take into ccount the three-dimensional nature of magnetic fields and ponliniarity of characteristics of magnetic materials. The description of the investigation method of three-dimentional magnetic fields at a computer is given, as well as the obtaining of results of analysis of parameters of separate lenses and quadrupole dublet at PM with the aid of the above method. Results proved by experimental data show that at permanent values of magnet characteristics in quadrupole lenses at PM, the alteration of pole lengths and the distance between lenses brings about the change not only in the effective field length, but in the induction gradient of quadrupole, as well

[en] Short communication

No abstract available