MANAGEMENT OF INTENSIVE THERAPY OF GENERAL PERITONITIS IN CHILDREN

In the presented work the results of treatment of 161 children at the age from

Interplay of non-linear elasticity and dislocation-induced superfluidity in solid Helium-4

The mechanism of the roughening induced partial depinning of gliding dislocations from Helium-3 impurities is proposed as an alternative to the standard "boiling off". We give a strong argument that Helium-3 remains bound to dislocations even at large temperatures due to very long equilibration times. A scenario leading to the similarity between elastic and superfluid responses of solid Helium-4 is also discussed. Its main ingredient is a strong suppression of the superfluidity along dislocation cores by dislocation kinks (D. Aleinikava, et. al., arXiv:0812.0983). These kinks, on one hand, determine the temperature and Helium-3 dependencies of the generalized shear modulus and, on the other hand, control the superfluid response. Several proposals for theoretical and experimental studies of solid Helium-4 are suggested.Comment: final version accepted to the special JLTP issue on Supersolid, 16 pages, 6 figures: typos corrected, more explanations give

Influence of Secondary Phase Particles on Zr-Alloy Plastic Flow Stability and Fracture

The influence of intermetallic particles and hydrides on the total and local ductility as well as on the fracture mechanism in Zr-2.5Nb and Zr-1Nb-l.3Sn-0.4Fe alloys was studied by the methods of acoustic emission (AE). Based on measurements of maximum (peak) values of AE amplitudes depending on secondary phase size and distribution two alternative mechanisms were established of loss of flow stability in alloys under tension : geometrical loss of strength for uniform fine particle distribution, and microcracking at the stage of uniform strain for coarse particle aggregates or fine particle stringers. Ways of increasing the fracture toughness resistance of alloys were suggested by increasing the stability of local flow at a crack tip through optimization of matrix deformation ability, secondary phase size and distribution within matrix. Analysis is given to quantitative relationships between fracture toughness and microstructure characteristics of alloys. Original devices and techniques were developed to quantitatively analyze local processes of strain and fracture based on AE measurements which allows assessment of unstable flow zones and measurement of microcrack 5 µm and more in size