Stability of the mechanical behavior of an arched TiNi strip under the conditions of the constrained shape memory effect

Unstable form changing (click) of an arched TiNi strip annealed at 773 K is investigated. After the annealing, the strip is placed into the grips of a deforming machine and is transferred to the martensitic state by bending in the direction opposite to its initial bend. Subsequent heating of the strip, which carries it to the austenitic state, is accompanied by a click under the conditions of constrained form changing. Analysis of the martensitic deformation in terms of the theory of diffuse martensitic transformations makes it possible to establish the conditions under which the form changing process becomes unstable.     

Reactions of 2-(2-Furyl)-1,3-dioxacycloalkanes with Triethylsilane

Russian Journal of Organic Chemistry -     

Cohomology of small categories with coefficients in an Abelian category with exact products

Conclusion The spectral sequence of Theorem 2.1 is widely known for the case where the group P acts freely on a simplicial set. Corollary 3.2 shows that both the result of [11] and the known estimates of the cohomological dimension of a directed colimit of groups are incorporated in this spectral sequence.Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 30, No. 4, pp. 210–215, July–August, 1989.     

Superstabilization of linear dynamic plants under operator disturbances

We consider the state stabilization problem for a linear stationary plant whose parameters and dynamic order can change jumpwise in the course of operation, which leads to changes in its mathematical model. We assume that the set of all possible mathematical models corresponding to the plant is finite. To solve this problem, we suggest to use the simultaneous superstabilization method and the dynamic order extension method.