Spectral independent component analysis of heart rate variability

Formal mathematical procedure of developed Spectral Independent Component Analysis (SICA) of heart rate variability (HRV) allows to obtain no more than three components forming the rhythmogramm of healthy person. This fact rationally represents physiological hypotheses about regulation systems taking part in forming HRV phenomenon. Applying SICA to HRV approves itself on timing intervals form 3 to 15 minutes. Вreaking the low limit of this timing interval causes essential worsening of quality of ICA components forming the rhythmogramm. Optimal application of SICA for splitting initial registered HRV signal into components is using SICA with five-minute HRV registering protocol

Personality profile and biofeedback quality in the loop of paced breathing and HRV

Студентська наукова конференція «The student researcher in the modern psychological space», Харківський національний університет імені В. Н. Каразіна, факультет психології, 2 грудня 2011 р

Stability analysis of RR and QT variability for cosmonauts data

Stability analysis of cardiovascular oscillations together with nonlinear nalysis gives important and complements information about their autonomic regulations. New nonlinear tools like M-indexes gives possibility to analyze stability of the most pure dynamic process that is observed with the help of RR and QT intervals variability

Nonlinear analysis of RR and QT variability for cosmonauts data

Nonlinear analysis of cardiovascular oscillations gives important information about their autonomic regulations. New nonlinear tools like Mindexes gives possibility to analyze the most pure dynamic process that are observed by RR and QT intervals variability. Time series classification that is based on Mindexes allows using stationary methods of oscillation variability like Fourier analysis for sure

Energy levels in muonic helium

The energy spectrum of bound states and hyperfine structure of muonic helium is calculated on the basis of stochastic variational method. The basis wave functions of the muonic molecule are taken in the Gaussian form. The matrix elements of the Hamiltonian are calculated analytically. For numerical calculation, a computer code is written in the MATLAB system. As a result, the numerical values of bound state energies and hyperfine structure for muonic helium are obtained.The work is supported by the RSF (Grant 18-12-00128)

A "former nobleman": survival in soviet realities

The issues addressed in the article are of particular relevance for the contemporary historiography due to the absence of systematic studies on the history of the "Soviet nobility" and their adaptation to the Soviet realities. An especially interesting aspect of this topic is the transformation of values and worldview of the nobility in the conditions of the dominant communist ideology. The article presents a comprehensive analysis of the nobility survival in the period of establishment of a totalitarian political regime and destruction of the traditional Russian system of values and religious traditions. The primary research method used to address the topic is the micro-historical analysis, which allowed the authors to obtain the following results: a typology of this social group was developed (involuntary or deported emigrants, open or hidden oppositionists, and those who were forced to adapt), based on characterization of beliefs, values and patterns of behaviour of individual representatives of the "former" nobility; oppressive measures used by the Soviet power against the "exploiters" were classified into several types: economic oppression, legal restrictions, ideological pressure and direct terror; and specific features of their adaptation to the Soviet realities, including its ethno-confessional aspect, were identified. The main conclusion drawn from the research is that the nobiliary culture and system of values proved extremely resistant to various challenges and threats of the Soviet epoch. Materials of this article have both theoretical and practical implications in the context of actualisation of the culture of mansions, nobiliary traditions and the cadet education in today´s Russia.Keywords: "Soviet nobility", system of values, emigration, opposition, terror, adaptatio

Dynamics of pain syndrome and quality of life in the application of vertebroplasty in patients with vertebral fractures against osteoporosis

Currently, insufficient attention is being paid to an issue of the necessary anti-osteoporotic therapy after percutaneous vertebroplasty for vertebral fractures associated with osteoporosis, which leads to premature termination of medical treatment and worsening of the treatment results in this group of patients.  An objective of the research is to study the results of treatment of patients with vertebral fractures associated with osteoporosis, depending on the use of anti-osteoporotic therapy. The results of percutaneous vertebroplasty of 91 postmenopausal women aged 50-90 years, depending on the use of anti-osteoporotic therapy during the postoperative period were analysed.  An assessment was made according to the dynamics of pain syndrome using the Visual Analogue Scale (VAS), the Quality of Life Scale by J.R. Gaughen to estimate the patient's mobility and a need for pain medication. The results of the treatment were assessed 3 and 6 months after the percutaneous vertebroplasty. Bone mineral density was measured using Dual-energy X-ray absorptiometry 6 month after the treatment. Anti-osteoporotic therapy, which was prescribed for all patients comprised calcium supplements, antiresorbents and in D-hypovitaminosis – alfacalcidol or cholecalciferol. Only half of the patients followed the recommendations – 46 (50.6%), while the rest of the patients stopped the therapy in 2-3 months due to the improvement of their condition. In the main group of patients, where necessary anti-osteoporotic therapy was administered, significant reduction of pain syndrome and increase in quality of life during 3 and 6 months’ observation period were revealed. In the group of patients where prescribed anti-osteoporotic therapy was not adhered, significant reduction of pain syndrome and increase in quality of life in the observation period 3 months was revealed but deterioration in the form of pain syndrome increase and decrease in quality of life in the observation period of 6 months occurred. Effectiveness of anti-osteoporosis therapy, with regard to measuring bone mineral density can be reliably confirmed only in the main group. Intraoperative and postoperative complications occurred up to 5.5%, and generally did not require further treatment and did not affect the overall treatment result. Thus, it was revealed that to ensure a stable effect after the surgery, long-term prescription of anti-osteoporosis therapy is needed

Mass spectra of doubly heavy Omega_QQ' baryons

We evaluate the masses of baryons composed of two heavy quarks and a strange quark with account for spin-dependent splittings in the framework of potential model with the KKO potential motivated by QCD with a three-loop beta-function for the effective charge consistent with both the perturbative limit at short distances and linear confinement term at long distances between the quarks. The factorization of dynamics is supposed and explored in the nonrelativistic Schroedinger equation for the motion in the system of two heavy quarks constituting the doubly heavy diquark and the strange quark interaction with the diquark. The limits of approach, its justification and uncertainties are discussed. Excited quasistable states are classified by the quantum numbers of heavy diquark composed by the heavy quarks of the same flavor.Comment: 14 pages, revtex4-file, 3 eps-figures, 5 tables, typos correcte

B_c meson production in \gamma\gamma collisions and charm content of the photon

Based on photon structure function formalism we have calculated $B_c(B_c^{*})$ meson production cross section in $\gamma\gamma$ collisions via partonic subprocess $c\gamma\to B_c(B_c^{*}) b$. It was shown that this approach gives the same results for $B_c^*(B_c)$ meson cross sections as the direct leading order QCD calculation of the subprocess $\gamma\gamma\to B_c(B_c^{*})b\bar c$ at small energy. Howere, opposite to the direct QCD calculation we have obtained the increase of the $B_c(B_c^{*})$ meson cross section at large energies. We have found also additional contribution to the $B_c$ meson production via the nonperturbative fluctuations $\gamma\leftrightarrow J/\psi$.Comment: LaTeX, 7 pages and 6 figures available upon reques