ЭБ Коллекция: NPCS Vol.28, no.1 (2025), pp. 1-104NPCS Vol.28, no.1 (2025), pp. 1-104https://elib.bsu.by:443/handle/123456789/3448732026-04-20T17:08:08Z2026-04-20T17:08:08ZCharacterization of regulatory differences in ambulatory blood pressure monitoring data by means of fractal analysisVoitikova, M. V.Khursa, R. V.Kalinov, V. S.https://elib.bsu.by:443/handle/123456789/3449372026-04-05T03:52:24Z2025-01-01T00:00:00ZЗаглавие документа: Characterization of regulatory differences in ambulatory blood pressure monitoring data by means of fractal analysis
Авторы: Voitikova, M. V.; Khursa, R. V.; Kalinov, V. S.
Аннотация: Non-invasive wearable 24-hour ambulatory blood pressure monitoring (ABPM) devices are widely used in clinical practice and allow measuring of systolic and diastolic blood pressure (BP) time series in freely moving subjects. Complex system such as hemodynamics is demonstrated to be a self-similar hierarchy. The aim of the study is to determine the clinical potential of fractal analysis of ABPM data, in particular the fractal dimension (FD) as a quantitative measure of the chaotic component of the hemodynamics. The FD estimator and linear regression modeling (LRBPP, Linear Regression of BP Parameters) were applied on ABPM data of 57 healthy volunteers, 47 hypertensive patients and 25 patients with acute hypotensive episodes caused by various diseases. The fractal analysis of ABPM data of normotensive, hypertensive and hypotensive patients showed that all ABPM time series demonstrate antipersistence and a tendency to return to the average BP level. It was shown, if FD value of the patient’s systolic blood pressure is greater or less than FDn = 1.8 (characteristic of normal hemodynamics, H2-class by LRBPP), then it is associated with pathology and worsening of the patient’s hemodynamic status, regardless of the disease. A decrease in the complexity of ABPM BP series (a decrease in FD values corresponding to hypotensive D1-class on LRBPP) indicates to weakened/absent regulatory influence of the BP level; an increase in FD to FDu = 2.0 indicates on the correlated or quasi-periodic behavior of the ABPM BP series caused by extreme regulatory impact (hypertensive H3-class). Thus, the FD value of ABPM data can be a hemodynamic marker of the regulatory differences due to process of adaptation, self-organization, and relationship of regulatory structures of different levels. FD value and an individual hemodynamic class determined by LRBPP can use as an integral indicator of ABPM data for assess the physiological/pathological state of the patient’s blood circulation.2025-01-01T00:00:00ZSimulation of Thermoconvective Flows as Applied to Design of Water Cooling Tower by Use of Mixture ModelTrifonov, A. G.Khadzko, A. S.https://elib.bsu.by:443/handle/123456789/3449362026-04-05T03:52:24Z2025-01-01T00:00:00ZЗаглавие документа: Simulation of Thermoconvective Flows as Applied to Design of Water Cooling Tower by Use of Mixture Model
Авторы: Trifonov, A. G.; Khadzko, A. S.
Аннотация: Thermoconvective flows are investigated on base of solution of 3D conservation equations in approximation of mixture model. Hyperbolic cooling tower is under consideration. Natural convection inside the design of a hyperbolic cooling tower depending on the temperature of the inside wall is considered. The values of the velocity field and the maximum velocity of the vapor-air flow are obtained.2025-01-01T00:00:00ZQuasiperiodic Dynamics in a Large Chain of Pump-Coupled LasersGrigorieva, E. V.Kaschenko, S. A.Tolbey, A. O.https://elib.bsu.by:443/handle/123456789/3449342026-04-05T03:52:08Z2025-01-01T00:00:00ZЗаглавие документа: Quasiperiodic Dynamics in a Large Chain of Pump-Coupled Lasers
Авторы: Grigorieva, E. V.; Kaschenko, S. A.; Tolbey, A. O.
Аннотация: We study the conditions for quasiperiodic dynamics in a chain of a large number of diffusively coupled lasers on the base of the distributed integro-differential model. The model takes into account the delay due to the optoelectronic conversion of signals in pumping lines. The values of coupling coefficient and the delay time are determined at which the codimension-two bifurcation of the stationary state occurs. A system of two complex Ginzburg–Landau equations is obtained as a quasi-normal form in the neighborhood of the bifurcation point. We get the homogeneous solutions of the quasi-normal which correspond to inhomogeneous waves in the distributed model. Such solutions can be interpreted as twoor three-frequency antiphase regimes in the chain of coupled lasers.2025-01-01T00:00:00ZModel-Independent Analysis of the Indirect Effects of an Additional Z`-Boson at CLICSinegribov, D. V.Andreev, V. V.Serenkova, I. A.https://elib.bsu.by:443/handle/123456789/3449332026-04-05T03:52:57Z2025-01-01T00:00:00ZЗаглавие документа: Model-Independent Analysis of the Indirect Effects of an Additional Z`-Boson at CLIC
Авторы: Sinegribov, D. V.; Andreev, V. V.; Serenkova, I. A.
Аннотация: In this paper, we present a technique for analyzing the indirect manifestation of an additional Z0-boson in the planned experiments at future e+e− colliders. The developed technique is based on the representation of the differential cross section for the process e+e− →ff (where f 6= e) incorporating new effective parameters of the Z0-boson. The availability of the electron polarization option plays a key role in the implementation of the technique. As a result, we obtained model-independent constraints on the characteristics of the Z0-boson, taking into account the experimental capabilities of CLIC.2025-01-01T00:00:00Z