Interaction between uranium oxide alloyed with Al2O3·SiO2 and pyrocarbon coating during irradiation of micro fuel elements

Translated from Atomnaya Énergiya, Vol. 66, No. 3, pp. 191–193, March, 1989.     

Topological methods for the binarization of gray-scale images

The problem of the binarization of gray-scale images of texts or, more precisely, the problem of choosing a threshold value, is analyzed. New, previously unpublished algorithms are considered. The main feature of these algorithms is that they take into account the topological features of an image. The results of practical investigations are presented and theoretically justified. Denis Valer’evich Khromov. Born 1987. Student of the Moscow State University. Scientific interests: optical pattern recognition. Participant of the International Conference for Young Scientists, 2004.     

The likely origin and calculability of physical constants

A simplified version of a theory in which the values of the fundamental constants are not specified but calculated is presented. In a development of existing research, self-structurization of a quantum ensemble of events is modeled, for which a hypothetical basis for the unity of measurements arises in the form of a rigorous system of elementary particles and their properties. __________ Translated from Metrologiya, No. 4, pp. 3–14, April, 2008.     

Dislocation structure,phase stability,and yield stress behavior of L1<Subscript>2</Subscript> intermetallics: Ir<Subscript>3</Subscript>X (X = Ti,Zr, Hf,V, Nb,Ta)

The structure and mobility of superdislocations in Ir₃X (X = Ti, Zr, Hf, V, Nb, Ta) with L1₂ structure were investigated in the framework of the modified Peierls-Nabarro (PN) model with first-principles generalized stacking fault energetics calculated using the all-electron full-potential linearized augmented plane wave method (FLAPW). Superlattice intrinsic stacking fault (SISF)-bound superdislocations (Kear splitting scheme) are strongly preferred energetically in Ir₃V, Ir₃Nb, and Ir₃Ta, whereas antiphase boundary (APB)-bound superdislocations (Shockley splitting scheme) are predicted in Ir₃Ti, Ir₃Zr, and Ir₃Hf. Because APB-bound superdislocations are considered responsible for the yield stress anomaly, our results predict that positive yield stress temperature dependence could only be expected in Ir₃Ti, Ir₃Zr, and Ir₃Hf, and a negative one in Ir₃V, Ir₃Nb, and Ir₃Ta. The connection of the mechanical behavior of the Ir₃X alloys with the L1₂ → D0₁₉ structural instability is established and the electronic origins of this instability are analyzed. This article is based on a presentation made in the symposium entitled “Beyond Nickel-Base Superalloys,” which took place March 14–18, 2004, at the TMS Spring meeting in Charlotte, NC, under the auspices of the SMD-Corrosion and Environmental Effects Committee, the SMD-High Temperature Alloys Committee, the SMD-Mechanical Behavior of Materials Committee, and the SMD-Refractory Metals Committee.