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.

Ensuring the stability of voltage-to-current converter with complex load

In this paper, the method of determining the stability of the voltage-to-current converter (VCC) with complex load, which is built on the DC amplifier with a deep negative feedback (NFB) by current. The feedback signal is formed on precise resistor, which is connected in series with an inductive load. The deep feedback and complex load can cause a violation of the stability of the VCC across the whole dynamic range of operation.

Investigation of Stability of Parametric Amplifiers in an Environment MAOPCs

The paper considers the question of the research of assessment of the stability of linear periodically time-variable circuits by the frequency symbolic method. The function system MAOPCs, which is based on the frequency symbolic method, is an effective tool of investigation of linear periodically time-variable circuits and in particular parametric amplifiers.

Визначення розрахункової довжини стрижня з пружним закріпленням кінців

The paper proposes the equation of stability compressed bar with elastic supports, which takes into effect of displacement one support to the other. Solution of the equation allows computing a coefficient of reduced length μ of the bar in the frame structure.

Розрахунок стійкості залізобетонних пологих оболонок з урахуванням дефектів при виготовленні

The minimal critical loadings and forms of the stability lost of the symmetric positive gayssian curved models of the shells with local imperfections were determined.

Financial analysis of the banking sector in Poland

In the market economy, banks act as financial intermediary. On one hand, they want to
make profit, but on the other hand they are called public-trust institutions. Since profit
maximization is not possible without taking risks, that is why risk taking must be controlled.
The activity of banks is therefore supervised by the Commission for Financial Supervision, the
National Polish Bank or Bank Guarantee Fund. Other participants in the economic process
must also have a clear picture of their financial position and management results. In the

Essence of modern financial and economic stability of business economics

We consider the basic criteria characteristics concept of financial and economic stability
of post-industrial economic type. Analyzed factors and factors of influence on the financial and
economic stability of modern businesses, taking them into account existing systems and models
in the management of sustainable development of enterprises.
Generalized and systematized problematic aspects in the subject field of knowledge, as
reflected in research on this topic. Particular emphasis on the lack of conformity with the real

Studies on sedimentation of asphaltene deposits in distillation residues

In this work, experimental methods used for the evaluation of stability of solids in liquids dispersions, are presented. For the characterization of dispersion components, modern analytical techniques, such as tensiometry, scanning and static turbidimetry, have been applied. The influence of selected surface active substances on the dispersion stability was demonstrated.