Ternopil Ivan Pul'uj National Technical University

About: Ternopil Ivan Pul'uj National Technical University is a based out in . It is known for research contribution in the topics: Deformation (engineering) & Fracture toughness. The organization has 134 authors who have published 187 publications receiving 1019 citations.

Fractographic Regularities in Fatigue Failure of 17Mn1Si Steel

Abstract: Using the scanning electron microscopy data the main regularities of the fatigue crack propagation in the 17Mn1Si steel were studied. Based on fracture surface observation and analysis one can testify that the transition of the leading role of deformation and failure from the lower structural level to the higher one has the ordered pattern.

Methods of monitoring, analysis and short-term prognosis of gas consumption taking into consideration its cyclic and non-stationary structure in heating season

Abstract: Review of main approaches of gas consumption prognosis and analysis models is given here. Most of them are long-term prognosis methods, which take into account some weather conditions (mostly temperature as most significant one), few short-term methods works only for non-heating period. Unlike the existing methods, new approach gives a possibility to analyze and calculate prognosis values of gas consumption in heating season taking into consideration its cyclic nature and temperature of environment at the same time. It helps to monitor, analyze, plan and manage loading of gas system during the day.

Approaches to Statistical Processing of Rhythmocardiosignal with Increased Resolution.

Abstract: The paper is devoted to statistical methods estimation of probabilistic characteristics of rhythmocardiosignal with increased resolution on the basis of its model in the form of a vector of stationary and stationary related random processes. The hypothesis about the normality of the law of components distribution of the rhythmocardiosignal with increased resolution is confirmed. It was made a decomposition of the statistical estimates of autocorrelation and intercorrelation functions allowed to obtain spectral and inter-spectral power density of vector components, that allowed to reduce the space dimension of diagnostic features in heart rate analysis systems based on rhythmocardiosignals with increased resolution. That allowed to substantiate the vector of diagnostic features in the systems of cardiac rhythm analysis based on the rhythmocardiosignals with increased resolution is substantiated.

A modified form of the polar model of crystals

Abstract: A model for description of materials with narrow energy bands is proposed. It is shown that in narrow-band materials electron-hole symmetry is absent in contrast to the Hubbard model. In this paper metal-insulator transition is studied. The obtained results are compared with experimental data for narrow-band materials. Some specific narrow-band effects are discussed.

Pressure-temperature phase diagram of the generalized Hubbard model with correlated hopping at half-lling

Abstract: In the present paper pressure-temperature phase diagram of a generalized Hubbard model with correlated hopping in a paramagnetic state at half-filling is determined by means of the generalized mean-field approximation in the Green function technique The constructed phase diagram describes metal-to-insulator transition with increasing temperature, and insulator-to-metal transition under the action of external pressure The phase diagram can explain paramagnetic region of the phase diagrams of some transition metal compounds We have found that taking into account correlated hopping allows much better description of these experimental data than the Hubbard model; this testifies also much better physics of the present model and the important role of correlated hopping