Positivity and stability of descriptor linear systems with interval state matrices

The positivity and asymptotic stability of descriptor linear continuous-time and discrete-time systems with interval state matrices and interval polynomials are investigated. Necessary and sufficient conditions for the positivity of descriptor continuous-time and discrete-time linear systems are established. It is shown that the convex linear combination of polynomials of positive linear systems is also the Hurwitz polynomial. The Kharitonov theorem is extended to the positive descriptor linear systems with interval state matrices.

Технічні рішення реконструкції моста із збірними залізобетонними попередньо напруженими прольотними будовами

The existing bridge designs and variations of design decisions reconstruction of the bridge expansion monolithic or precast-monolithic concrete slab and enhancement bill beams change their static circuit with a split on a continuous are described.
The existing span structure reinforced concrete, ribbed beam cross-cutting scheme
10 × 16,8 m clearance Г-7 + 2 × 0,9 m was built in 1960–64 years as a pilot facility construction of prestressed beams by Ukrdortrans NDI (now DerzhdorNDI).
Reconstruction span structure included its extension to clearance Г -10 + 2 × 1,0 m

Deformational structures and stress field of the south-western Crimea in the context of the evolution of Western-Black basin

The purpose of this paper is to describe and analyze the deformations of the mesolevel (slickensides, fractures, faults) in the rock complexes of different age, to reconstruct the stress fields which corresponds to them. The results of interpretation will be compared with the previous studies as well as with known seismic sections and with earthquake focal mechanisms of Crimean-Caucasian seismogenic zone , analyzing them in the context of tectonic evolution of Western-Blak Sea Basin. To define the tectonic stages, specifying the age of deformation. Methodology.