[en] The article presents the information on development of the closure technology and the closure of three never-used test boreholes at the Balapan test field of the Semipalatinsk test site. The work is performed under the cooperative agreement between the United States and Kazakhstan governments. (author)

[en] Anomalous electron scattering near structure phase transition in PbTesub(1-x)Ssub(x) is investigated. In samples with x=0.05 when electron concentration changing by two orders Tsub(c) remains unchangeable, and the value of anomaly in scattering (Δ rho) changes regularly with electron density. Appearance of anomalous scattering near Tsub(c) is related to scattering on preordering clusters. Change in Δ rho(T) curve form observed in x approximately equal to 0.2 region is explained by appearance of an infinite cluster. Hardening phenomena detected when fast sample cooling can be caused by freezing nonequilibrium cluster configurations. Donor (In, Cd, Cu, Sb) and isovalent (Sn, Ge) impurity effect on phase transition into PbTesub(1-x)Ssub(x) is considered

[en] In compliance with the CTBT, the International Monitoring System is established. The infrasonic station, recently constructed nearby Aktyubinsk City, is an element of this system. The construction of the station, examples of signals recorded by it are given in the article. (author)

[en] Possibility of determination of steel physical yield strength (carbon, chromium, and chromium-nickel steels) has been studied at high temperatures on the basis of utilization of the regularity of stability of relative strengthening of hot-deformed austenite, established previously. On the basis of strengthening curves obtained for the temperature range of forging and hot rolling and free of yield plateaus, it is possible to define numerical values of physical yield strength with the use of the above regularity of stability of relative strengthening of hot-deformed austenite. Physical yield strengths, thus found, are governed by the N.S. Kurnakov law

No abstract available

[en] A new method for investigating strengthening-weakening of steels and alloys in austenitic state, which permits to reduce the share of experimental part when plotting graphs σ (epsilon, epsilon, T) is suggested. The method suggested for determining the deformation allows to predict families of strengthening curves from existing individual strengthening curves in the ranges of deformation temperatures, velocities and degrees of importance in practice for high-heat pressure treatment of metals. Dependence permitting to describe variation of metal deformation resistance during non-isothermic fractional deformation has been obtained

[en] Electric and photoelectric properties testify of the existence of the second type phase transition in PbTesub(1-x)Ssub(x). A change in the rho(T) behaviour in the vicinity of Tsub(c) at X > or approximately 0.2 is explained by the appearance of the critical scattering region

[en] Conditions for growth of crystals of Pbsub(1-y)(Ssub(x)Tesub(1-x))sub(y) solid solution from the vapour by the mechanism of vapour-liquid-crystal are determined, dependence of the lattice parameter on its molarity is investigated. Boundaries of the region of homogeneity of solid solution are determined, composition and properties of crystals are studied

[en] Main problems of regulation of multicomponent semiconducting phase composition are considered. Choice of the conditions for preparation of the assigned composition is based on P-T-x-y phase diagram T-x-y and P-T-x diagrams of three-component systems of the A⁴B⁶ group are discussed. Data on deflection of solid solution composition from stoichiometry are presented. The effect of atomic defects on semiconducting properties of crystals is discussed, the values of constants of quasichemical reactions of atomic defect formation in Pb_1-xSn_xTe; PbSe_1-xTe_x; PbS_1-xTe_x, PbSe_1-xS_x solid solutions are given

[en] Investigation of local surrounding of lead and selenium atoms in the PbTe_1-xSe_x solid solution is carried out through the EXAFS-spectroscopy method. High values of the Debye-Waller factors for the Pb-Pb interatomic distances (the second coordination sphere) and their noticeable deviation from the Vegard law were unexpectedly determined. The calculations, conducted through the Monte Carlo method, show, that the peculiarities observed are connected with the complex structure of the Pb-Pb distance distribution function. It is established, that the Se-Se pair number in the second coordination sphere exceeds the static value, which indicates the substantial role of chemical factors by forming the solid solution structure. The contribution of chemical factors to the enthalpy of solid solution mixing (≅ 0.5 kcal/mol)