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The elastic interactions of two CdSe structural modifications (cubic and hexagonal) were studied for the comprehensive analysis of polycrystalline cadmium selenide parameter degradation. The system studied was modeled as a hexagonal matrix with a spherical inclusion of the cubic modification where elastic strains were calculated at the matrix-inclusion boundary. The fulfilled analysis permitted, besides the main problem solution, to obtain the elastic constants μ and K for two modifications of CdSe, which essentially supplies the known material characteristics. The top value of the pressure, P0normal component, achieves 109 Pa, which excesses over the known values of P0. The results achieved may be useful for the further investigations of the degradation transformations in a polycrystalline biphase systems. [ABSTRACT FROM AUTHOR]

We study the corrosion-electrochemical behavior of 15Kh2NMFA steel in borate-buffered reactor water within the temperature range 22–300°C and establish the relationship between the temperature dependences of the corrosion-fatigue crack growth rates and the electrochemical behavior of steel. The influence of the galvanic couple formed by the refreshed and passivated surfaces on the acceleration of growth of corrosion-fatigue cracks is revealed. It is shown that this type of steel is susceptible to passivation in the entire temperature range. [ABSTRACT FROM AUTHOR]

We study the influence of the temperature and composition of the feed water of ammonia-hydrazine control on the corrosion-electrochemical behavior of 08Kh18N10T stainless steel. It is shown that, as temperature increases from 25 to 300°С, the corrosion currents increase by more than an order of magnitude for hydrazine concentrations of 0-2.0 mg/kg, by 1.5-2 orders of magnitude depending on the concentration of chlorides, and by two orders of magnitude within the рН range 6.9-9.0. We plot the dependences of the susceptibility of steel to pitting and repassivation on temperature, on the concentrations of hydrazine and chloride ions, and on the рН value. It is shown that, for a content of chloride ions of 2.0 mg/kg and рН 6.9, the analyzed steel is most susceptible to the initiation of pits within the range 25-300°С. [ABSTRACT FROM AUTHOR]

The role and performance of various layers (steel, cast iron (CI), concrete, lead, borated polyethylene (BPE), lithium filled polyethylene (LiPE)) and their combinations as shielding against neutrons and photons in the ATLAS experiment forward region (JF shielding) have been studied by means of Monte-Carlo simulations. These simulations permitted one to determine the locations of appearance and disappearance of neutrons and photons and their number at these locations. In particular, the determination of the number of newly born neutrons and photons, the number of stopped neutrons and photons, as well as the number of neutrons and photons crossing the borders of shielding layers allowed the assessment of the JF shielding efficiency. It provided a basis for comparing the merits of different configurations of shielding layers. The simulation code is based on GEANT, FLUKA, MICAP and GAMLIB. The results of the study give strong support to a segmented shielding made of five layers (steel, CI, BPE, steel, LiPE). [Copyright &y& Elsevier]

A short description of experiment TGV (double beta decay of48Ca) is given. The measurement started in the Modane underground laboratory in August 1996. The first result of T ≥ 4.6 × 1020 years [90% CL] after 2545 hours is presented. [ABSTRACT FROM AUTHOR]