Gravitational radiation from nonaxisymmetric spherical Couette flow in a neutron star

The gravitational wave signal generated by global, nonaxisymmetric shear flows in a neutron star is calculated numerically by integrating the incompressible Navier--Stokes equation in a spherical, differentially rotating shell. At Reynolds numbers \Rey \gsim 3 \times 10^{3}, the laminar Stokes flow is unstable and helical, oscillating Taylor--G\"ortler vortices develop. The gravitational wave strain generated by the resulting kinetic-energy fluctuations is computed in both $+$ and $\times$ polarizations as a function of time. It is found that the signal-to-noise ratio for a coherent, $10^{8}$-{\rm s} integration with LIGO II scales as $6.5 (\Omega_*/10^{4} {\rm rad} {\rm s}^{-1})^{7/2}$ for a star at 1 {\rm kpc} with angular velocity $\Omega_*$. This should be regarded as a lower limit: it excludes pressure fluctuations, herringbone flows, Stuart vortices, and fully developed turbulence (for \Rey \gsim 10^{6}).Comment: (1) School of Physics, University of Melbourne, Parkville, VIC 3010, Australia. (2) Departamento de Fisica, Escuela de Ciencias,Universidad de Oriente, Cumana, Venezuela, (3) Department of Mechanical Engineering, University of Melbourne, Parkville, VIC 3010, Australia. Accepted for publication in The Astrophysical Journal Letter

Peculiarities of psychosocial stress in relative of cerebrovascular pathology patients

A disease is stressful situation both for the patient and for his family. Materials and methods. On the grounds of PIC at the base of Emergency Medicine Centre of Kharkiv Regional Clinical Hospital during 2016-2018, 252 relatives of cerebrovascular pathology patients were examined. The patients had different stages of the diseases. The psychosocial stress was assessed according to L. Reeder’s “Psychosocial Stress Scale”. To analyze the potential stressor factors, each group was subdivided according to Boston Stress Test for stress-resistance. Results. The appearance of clinical symptoms of somatic illness in a patient was accompanied by an increasing rate of psychosocial stress among family members (1.44±0.63 points in the relatives of patients without disease; 1.51±0.67 points in relatives of cardiovascular risk patients; 1.67±0.65 points in the relatives of transitory ischemic attacks patients and 2.0±0.47 points in the relatives of stroke patients, p < 0.05). The components of psychosocial stress were the destabilization of interpersonal communication against the background of manifestations and consequences of the disease, reducing the patient’s work capacity and respectively the growing need for physical and emotional support, redistribution of family’s roles and responsibilities, and the exhaustion of family resources (psychological, social, physical). It was revealed that increasing stress risk is accompanied by an increasing level of psychosocial stress among family members and jointly creates a psychopathogenetic basis for the development of family maladaptation in CVD patient’s family. Conclusions. Medico-psychological measures directed at the families of cerebrovascular pathology patients are an important component of complex help

Nonlinear axisymmetric liquid currents in spherical annuli

A numerical analysis of non-linear axisymmetric viscous flows in spherical annuli of different gap sizes is presented. Only inner sphere was supposed to rotate at a constant angular velocity. The streamlines, lines of constant angular velocity, kinetic energy spectra, and spectra of velocity components are obtained. A total kinetic energy and torque needed to rotate the inner sphere are calculated as functions of Re for different gap sizes. In small-gap annulus nonuniqueness of steady solutions of Navier-Stokes equations is established and regions of different flow regime existences are found. Numerical solutions in a wide-gap annulus and experimental results are used in conclusions about flow stability in the considered range of Re. The comparison of experimental and numerical results shows close qualitative and quantitative agreement

Convective flows of viscous fluid in spherical layers. Certain astrophysical applications

The convective stability of a viscous liquid in spherical layers is investigated taking into consideration rotation, the latitudinal temperature gradient, and shear flow. The results of calculating nonlinear convective motion in spherical layers are examined. A discussion is given of the applicability of the results obtained to studying convection in astrophysical objects

Road landscapes - recreation and tourism sphere segment (on the example of Chernivtsi city)

The presented publication analyzes Chernivtsi city road landscapes, reveals the natural conditions of their formation and functioning, investigates the network of city and residential streets, characterizes groups of roads that are used in the city recreational and tourist sphere and can potentially be included in tourist routes