bluuebunny/crossref_metadata_2025 huggingface dataset:
Knowledge and perceived implication of lassa fever among residents of Oke-Ero Local Government Area, Kwara State Nigeria
Authors: Oniyangi Shuaib Olanrewaju , Oladosu Rachael Omoniyepe , Jamiu AbdulQudus Tosin
Published: February 2022

This study investigated the knowledge and perceived implication of Lassa fever among residents of Oke-Ero Local Government Area, Kwara State. The major occupation of the residents of Oke-Ero is farming. During the dry season, some farmers make use of bush burning method as a mean of clearing their lands, during which many of the rats from the bushes find their ways to neighbourhood houses to hide for safety. This gives them access to food stuffs kept by the residents. The purpose of the study was to investigate whether the residents of Oke-Ero Local Government Area, Kwara State have knowledge of transmission of Lassa fever and determine whether death is a perceived implication of Lassa fever among the residents of Oke-Ero Local Government Area, Kwara State. A descriptive research design was adopted for the study. The population for the study comprised of all the residents of Oke-Ero Local Government Area, Kwara State. Multi-stage sampling technique consisting of simple random, proportionate and convenience sampling techniques was used to select a sample size of four hundred and two (402) respondents for the study. A researcher-designed questionnaire validated by three (3) experts from the Department of Health Promotion and Environmental. Health Education, University of Ilorin, Nigeria was used for the data collection. Split half method was used to ascertain the reliability of the instrument. A correlation coefficient (r) of 0.70 was obtained through the use of Cronbach alpha. Data collection was conducted by the researcher and three trained research assistants. Inferential statistics of Chi-square (χ2) was used to analyse the postulated null hypotheses at 0.05 level of significance, using Statistical Package for Social Science (SPSS) version 20.0 software. The findings of the study showed that residents of Oke-Ero Local Government Area, Kwara State significantly have knowledge on the transmission of Lassa fever. This was because cal. χ2 value (586.90) is greater than critical value (7.82). Death is significantly perceived as implication of Lassa fever among the residents of Oke-Ero Local Government Area, Kwara State. This was because cal. χ2 value (271.41) is greater than critical value (16.92). Based on the findings, it was concluded that residents of Oke-Ero Local Government Area Kwara State have knowledge of the transmission of Lassa fever, and death is perceived as implication of Lassa fever among the residents of Oke-Ero Local Government area Kwara State. Therefore, the researcher recommended that residents should not leave food items open, so as not to give rats access to their food and cultivate the habit of cleanliness. It is also recommended that, further knowledge on Lassa fever and implication should be intensified and campaigns and health education should be carried out to improve the knowledge of residents about the Lassa fever disease.
EASI Praxis Tests: Age Trends and Internal Consistency
Authors: Lamash Liron , Grady-Dominguez Patricia , Mailloux Zoe , Parham L. Diane , Schaaf Roseann C. , Smith Roley Susanne , Gal Eynat
Published: February 2022

Importance: Ayres Sensory Integration® is an evidence-based practice that requires a comprehensive assessment before intervention. The Evaluation in Ayres Sensory Integration (EASI) is intended for this purpose, and psychometric data are needed to determine its validity and reliability.

Objective: To evaluate the internal consistency of four EASI Praxis tests and their validity as developmental measures.

Design: Cross-sectional developmental design.

Setting: Participants’ homes.

Participants: Typically developing children and young adolescents, ages 6 to 12 yr (N = 234).

Outcomes and Measures: We analyzed four EASI Praxis tests using Cronbach’s α, Pearson correlation coefficients, and one-way analysis of variance to explore internal consistency and developmental trends.

Results: The findings indicate moderate to high internal consistency for all tests. Significant correlations between age and praxis scores indicate that the EASI Praxis tests are sensitive to developmental changes.

Conclusions and Relevance: Occupational therapists can have confidence in the internal consistency and sensitivity to developmental changes of these praxis scores through early adolescence.

What This Article Adds: Occupational therapists administering EASI Praxis tests can have confidence that they consistently measure praxis ability and are sensitive to developmental changes across ages 6 to 12 yr. The results suggest that praxis continues to develop into early adolescence, and adolescents may benefit from assessment and intervention targeting praxis ability.
Breakthrough projects of the scientific program of the Millimetron Observatory (“Spectrum-M” project)
Authors: Novikov I.D.
Published: February 2022

The article presents the scientiﬁc program of the Spectrum-M project. Three most important — “breakthrough” projects have been identiﬁed: 1) Study of physical processes at the early stage of the expansion of the Universe, 2) Investigation of processes near the horizon of a black hole and the search for possible manifestations of wormholes in the Universe, 3) Investigation of observational manifestations of the emergence life in the Universe. Examples of “breakthrough” projects are described and some related second-level projects are indicated. The article uses the materials from our other publications.
Project Lyra not on ISS
Authors: Prokhorov M.E. , Zakharov A.I. , Stekolshchikov O.Yu. , Tuchin M.S.
Published: February 2022

The aim of the Lyra-B project was to carry out a high-precision multicolor multiple photometric survey of high and moderatebrightness stars across the entire sky. It was assumed that the survey Lyra-B will be carried out from the ISS. Due to theshutdown of the ISS in 2025, this project probably will not happen. The paper discusses the possibilities and feasibility ofperforming the survey on an autonomous spacecraft or on board the future Russian space station ROSS.
System of Observation of Day-time Asteroids (SODA)
Authors: Shugarov A. , Shustov B. , Shmagin V. , Buslaeva A.
Published: February 2022

The project SODA (System of Observation of Day-time Asteroids) designed for exhaustive detection of decameter (>5-10m) meteoroids approaching the Earth from the day-time sky. The system consists of two Spacecraft (SC) placed into orbitsin the vicinity of the Lagrange point L1 of the Sun-Earth system. Each SC is equipped with one to three small aperture(25-30 cm) telescopes that are to observe near space in a conical region around the Earth. For objects on collisional orbitsthe SODA ensures a warning time of 10-20 hours and the coordinates of the atmospheric entry point with up to 10×100km accuracy.
Main qualification campaign results of WSO-UV mission UV CCD detectors
Authors: Shugarov A. , Vishnyakov E. , Shatohin A. , Kuzin S. , Kirichenko A. , Nikolenko A.
Published: February 2022

World Space Observatory Ultraviolet (WSO-UV) is a major Russian-led international collaboration to develop a large Space-borne 1.7 m Ritchey-Chretien telescope to study the Universe in ultraviolet wavelengths. Three channels of the WSO-UVWUVS spectrograph operate in 115-310 nm range. The detectors of each channel have an almost identical custom UV-optimized CCD inside a vacuum enclosure and low noise drive electronics. The main challenges of the WUVS detectors areto achieve the best possible quantum eﬃciency in the FUV-NUV range, provide low readout noise (<3 e − at 50 kHz) andlow dark current (< 12 e − /pixel/hour), operate with integral exposures of up to 10 hours and provide good photometricaccuracy. This paper presents a brief summary of the WUVS Engineering Qualiﬁcation Model (EQM) detectors’ qualiﬁcationcampaign.
Comparison of the dynamics of Jupiter’s coorbital asteroids and the dynamics of bodies in debris disks
Authors: Abdulmyanov T.
Published: February 2022

The mechanisms of fragmentation of the equatorial dust disk around young stars and the formation of planetary systemsare considered. Using the model of librational motions of co-orbital asteroids of Jupiter, a model of viscous motion of gas,dust particles and small bodies in dust disks is constructed. The dynamic viscosity is obtained from the Navier-Stokesequation for three cases of characteristic ﬂow orbits.It is shown that the librational orbits of Trojans at the early stages ofthe evolution of planetary systems could be transit orbits for dust particles during the formation of celestial bodies of smalland large sizes and masses.
Generating function of Euler-Poinsot tensor’s components for small celestial bodies
Authors: Burov A. , Nikonova E.
Published: February 2022

The structure of the generating function of a polyhedron with triangular faces approximating the surface of a small celestialbody is discussed. The derived formulas are used to calculate the components of the Euler-Poinsot tensor up to the fourthorder for the asteroid (486958) Arrokoth.
Dynamical estimation of masses of the Main asteroid belt and some individual asteroids within the EPM ephemeris using infrared data
Authors: Kan M. , Pavlov D.
Published: February 2022

The purpose of this work is to estimate the mass of the main asteroid belt and those of the individual asteroids. To solve thistask we propose to use Tikhonov regularization which allows to use a priori information on the asteroids’ masses and theiruncertainties. Each a priori mass and its uncertainty were calculated based on the infrared diameter and density estimatesof a particular asteroid. As a result, we managed to obtain mass estimates consistent with those obtained earlier, and toextend the list of asteroids whose masses are individually determined in the EPM dynamical model.
Current state and future plans of the Earth’s orientation parameters evaluation activities in MMC SSTF
Authors: Pasynok S. , Bezmenov I. , Ignatenko I. , Ivanov V. , Tsyba E. , Zharov V.
Published: February 2022

Main Metrological Center of the State Service for time, frequency and EOP evaluation (MMC SSTF) regularly carries outwork in the ﬁeld of Earth orientation parameters (EOP) evaluation and predicting in service mode. EOP activities andimprovement of the MMC SSTF hardware and software for EOP evaluation purposes in 2020 - early 2021 as well as plansfor the near future are reviewed in the report.
Comparison of the semi-major axis drift taking into account the Yarkovsky effect in two orbital reference frames
Authors: Sannikova T.N.
Published: February 2022

Let the asteroid move under the inﬂuence of the attraction to the Sun and the Yarkovsky force. For this problem, thelong-term evolution of the semi-major axis is investigated by solving the averaged equations of motion. The drift of thesemi-major axis of the object’s orbit occurs under the action of the transverse or tangential component of the perturbingacceleration, but, obviously, the drift magnitude should not depend on the choice of the frame of reference. We found thenumerical values of the transverse and tangential components of acceleration as average values over the orbital period basedon the linear thermophysical model of the Yarkovsky force and calculated both semi-major axis drifts over 1 million yearsfor 12 asteroids with various orbital eccentricities. Comparative analysis showed that when simulating the Yarkovsky eﬀectby transverse acceleration, the drift estimate can be overestimated for objects with highly elliptical orbits.
Possible Variations in the Limb-Darkening Coefficients of Eclipsed Stars at Short Time Intervals
Authors: Abubekerov M. , Gostev N.
Published: February 2022

The interpretation of high-precision transit light curves of binary systems with exoplanets Kepler-5b, Kepler-6b, and Kepler-7b is performed for three diﬀerent epochs. It has been demonstrated that the values of the stellar limb-darkening coeﬃcientsdiﬀer signiﬁcantly for each epoch, while the geometric parameters for each epoch agree well with each other within the errormargin. It is shown that reliable determination of the limb-darkening coeﬃcients requires methods that would “clear” theobserved transit light curves from eﬀects caused by surface inhomogeneity.
Two-dimensional MHD model of gas flow dynamics near a young star with a jet and a protoplanetary disk
Authors: Grigoryev V.V. , Demidova T.V.
Published: February 2022

Flow of matter in the immediate vicinity of a T Tauri type star with a constant dipole magnetic ﬁeld on a two-dimensionalaxisymmetric computational grid is simulated. Within the framework of a nonstationary MHD approach, the interaction ofa jet, a partially ionized gas of the stellar corona, and a protoplanetary disk is considered. The model takes into accountthe degree of gas ionization, optically thin cooling, anisotropic thermal conductivity and viscosity. Numerical modeling isperformed using the free PLUTO package.
Observations of the gamma-ray pulsar J1836+5925 at 111 MHz
Authors: Timirkeeva M. , Malov I. , Malofeev V. , Malov O.
Published: February 2022

We describe the 10-day radio observations of the gamma-ray pulsar J1836+5925. Observations were carried out on thePushchino Radio Astronomical Observatory at the frequency of 111 MHz using the Large Phased Array of the LebedevPhysical Institute.
The impact of star spots and other photospheric structures on exoplanetary transit timings
Authors: Baluev R.V. , Sokov E.N. , Shaidulin V.Sh.
Published: February 2022

We consider possible ways to explain the issue of excessive noisy transit timing variation (TTV) observed for severaltransiting exoplanets. In particular, for HD 189733 b we ﬁnd a TTV jitter of ∼ 70 s that cannot be easily explained by asimple model. A possible cause can be the eﬀect of photospheric activity structures on the derived transit timings. Basedon our systematic search of 1598 transit lightcurves for 26 targets, we found 109 potential spotcrossing or facula-crossingevents. However, this rate appears too low to explain the observed TTV excess, espicially for HD 189733.
Search for deviations in exoplanetary infrared profiles, based on the secondary eclipse analysis
Authors: Fedotov A.A. , Baluev R.V.
Published: February 2022

Aperture photometry of Spitzer space telescope observations of HD209458 b in the 3.6µm channel was conducted. Toﬁnd deviations in the exoplanetary infrared emission, the modelling of secondary eclipse light curves was carried out. Thenoise from intrapixel sensitivity variations was modelled by Gaussian processes. The obtained value of the eclipse depth is0.094±0.013% of the total ﬂux of the system and is consistent with the results of previous work and the works of otherauthors.
Thermal evolution of the cores of the icy satellites of the giant planets
Authors: Kronrod E. , Kronrod V. , Kuskov O.
Published: February 2022

Modern models of satellites of the giant planets include a water-ice shell and an iron silicate core with the possible presenceof an inner Fe-FeS core. During missions to Jupiter and Saturn (Galileo, Cassini-Huygens), new data were obtained thatimpose restrictions on the structure of the ice giant satellites Ganymede, Callisto and Titan. However, questions about thecomposition, size, and physical properties of satellite cores and their thermal evolution are still the subject of numerousdiscussions. Temperature distributions in the cores of satellites largely determine the degree of hydration of their silicatecomponent, the presence or absence of internal metal cores. The thermal evolution of the cores is determined by their size,as well as physical properties - density, thermal conductivity, heat capacity, and radiogenic heat release. In this work, weconsidered two geochemical models of core composition and their combinations that are maximally diﬀerent in physicalproperties: silicate models with the composition of matter of ordinary (L / LL) chondrites and hydrosilicate models closeto the composition of carbonaceous (CI) chondrites. The results of calculations of unsteady temperature regimes in thecores of ice satellites are presented, taking into account the composition, convective heat transfer, and possible processesof dehydration of hydrated silicates in the cores. Calculations of thermal evolution and dehydration processes in cores withconcentrations of hydrosilicates C Hsil = 0 - 1 and core radii R core = 500 - 2000 km were performed. Based on the resultsof numerical experiments, it can be concluded that the initial concentration of hydrosilicates (C Hsil ) and the radius of thecore (R core ) signiﬁcantly aﬀect the thermal evolution and dehydration of the core.
On load Love numbers for Venus
Authors: Menshchikova T. , Gudkova T.
Published: February 2022

Load Love coeﬃcients are calculated for diﬀerent rheological models of Venus. A static approach is used, for which two loadlevels are considered: the surface load (the planetary relief) and anomalous density variations located at depth. The planetis modeled as an elastic, self-gravitational body, while the density, elastic modulus and shear modulus being dependent onthe radius. The calculations have been performed up to the spherical harmonic degree and order 70, based on the accuracyof the gravity ﬁeld at the moment. Several types of rheological models of Venus are considered. As a ﬁrst approximation, wetake an elastic model (Model A). In the second case (Model B) we assume the presence of an elastic lithosphere. Beneaththe lithosphere there is a softened layer, which partly lost its elastic properties. Spreading till the core, softened layeris characterized by a reduced (to one-tenth of the initial value) shear modulus. In the third model (Model C) the shearmodulus is changing gradually: one-tenth of the initial value of shear modulus just beneath the crust is increasing up to itselastic value at the core-mantle boundary.
New reflectance spectra of Main belt asteroids: clarification of taxonomic types and composition of matter
Authors: Shcherbina M.P. , Busarev V.V. , Barabanov S.I.
Published: February 2022

The mineralogy of the surface matter of asteroids can be judged using a qualitative interpretation of the reﬂection spectraof these bodies. The features of the reﬂectance spectra (absorption bands) are wide enough for correct interpretation even ata low resolution of the recording device. It should be noted that the number of events of registration of sublimation activityamong primitive asteroids has been increasing recently. The emergence of a temporary exosphere aﬀects the asteroid’sreﬂection spectrum. The reﬂection spectra of 12 asteroids of the Main Belt, mainly of primitive type, have been obtainedand analyzed. The aim of the research was to study the inﬂuence of the temporal exosphere on the correct determinationof the spectral type of the asteroid. In addition, for asteroid 203 Pompeia, the spectral type has been determined for theﬁrst time(class C).
Rotation measure and vertical structure of accretion disks
Authors: Buldakov M.A. , Vasiliev E.O. , Andrianov A.S.
Published: February 2022

Rotation measure (RM) can give information about properties of magnetohydrodynamic (MHD) turbulence in accretiondisks. RM measured in observations is averaged by large volumes and it may have complicated alternating-sign structure.We study possible relations between RM and properties of turbulence in disks. We numerically simulate development ofMRI turbulence in a local fragment of disk. Evolution and spatial distribution of α-parameter, vertical mass ﬂux and RMare studied for two initial magnetic ﬁeld conﬁgurations and values of initial midplane plasma β 0 (ratio of gas pressure tomagnetic pressure) in range 10 0 − 10 3 . The pairwise correlations between α parameter, vertical mass ﬂux and RM arecalculated. The values of correlation levels are in range 0.50-0.95. It shows that oscillations of RM roughly correspond tooscillations of α and vertical mass ﬂux. The period of these oscillations is approximately equal to the one of dynamo cycle.
Mergers of primordial black holes in compact clusters
Authors: Eroshenko Yu.
Published: February 2022

It is shown that ∼ 10 % of the total dark matter mass can be transformed into gravitational radiation by primordial blackhole (PBH) mergers inside the compact clusters. If the mass transformation occurred after recombination, but at redshiftsz ≥ 10, the generated gravitational radiation do not contribute to the current density of the Universe. This eﬀect increasesthe rate of cosmological expansion in the era of recombination compared to models without the mass transfer. Accordingly,the Hubble constant, obtained from measurements in the early Universe, changes, which can provide a solution to the“Hubble tension” problem.
Magnetic fields of accretion disks and their vertical structure
Authors: Pashentseva M.V. , Mikhailov E.A.
Published: February 2022

Accretion disks formed around compact objects such as black holes, neutron stars and white dwarfs are of great interest inastrophysics. An important role in the processes of their evolution is played by magnetic ﬁelds, which can be associated, forexample, with the transfer of angular momentum between diﬀerent parts of objects. There are various approaches to studyingthese magnetic ﬁelds and explaining the mechanism of their generation. Diﬀerent works showed that it can be generated bythe dynamo mechanism which is based on diﬀerential rotation and alpha-eﬀect. Previously, the no-z approximation whichﬁrstly was developed for galaxies, made it possible to obtain a number of results related to the structure of the magneticﬁeld of the accretion disk and the nature of its evolution with time. At the same time, such phenomena as convection, whichrequires taking into account the vertical structure of the disk, cannot be studied in such simpliﬁed models. In addition, thehalf-thickness of the disk changes as the distance to the center increases. All this requires us to expand the representationsused in modeling. In the case of galaxies, this approach is called the RZ-model. In this article, we plan to present the ﬁrstresults obtained using these approaches for accretion disks.
On the polarization of velocity fluctuations in undisturbed solar wind
Authors: Erofeev D.V.
Published: February 2022

Measurements of velocity in near-Earth heliosphere were analized in order to investigate systematical deﬂection fromtransversality of velocity ﬂuctuations in solar wind. Deﬂections of two kinds have been considered. One of them is char-acteristic of ﬂuctuations occured in azimuthal plain of heliosphere, while another is inherent in ﬂuctuations occurred inmeridional plain during minima of solar cycle.
Thermal Trigger for Solar Flares
Authors: Ledentsov L.
Published: February 2022

We consider the thermal stability of three piecewise homogeneous models of the preﬂare current layer: a neutral currentlayer, a non-neutral current layer, and a current layer with oblique fragmentation. Solution to the problem allows theformation of an instability of thermal nature. The instability results in fragmentation of the current layer with a spatialperiod of 1 − 10 Mm along the current direction in a wide range of coronal plasma parameters. The result can explain theobserved spatial periods of energy release in solar ﬂares.
Visualization of the microturbulence distribution on the surface of the Sun
Authors: Mozharovsky S.G.
Published: February 2022

A technique is described that can be used to obtain approximate values of microturbulent velocity v mi by comparing theequivalent widths of two spectral lines Fe I λ 6302 and 6301 Å. A map of the distribution of microturbulence over a solarsurface are given according to the observational data of Hinode SOT/SP. It is shown that v mi correlates with the line ofsight (LOS) velocity gradient and that it does not correlate with the solar surface brightness and LOS velocity itself.
Comparison of tree methods for estimating the magnetic field value obtained from the Hinode spectropolarimeter data
Authors: Mozharovsky S.G.
Published: February 2022

Three methods of estimating the magnetic ﬁeld, which are based on the analysis of Stokes proﬁles of the Hinode SOT/SPdata, are compared. These are ﬁeld values from the Milne-Eddington (ME) inversion, the values obtained by the center ofgravity (COG) method, and the values from the absolute width at half maximum (FWHM) of the Fe I λ 6302 Å line. It isshown that in the areas of the quiet photosphere, COG and FWHM methods give data that are related by a dependenceclose to linear. The data obtained as a result of the ME inversion for the quiet photosphere cannot be considered reliable.It is also shown that most of the elements of the photosphere with a magnetic ﬁeld move downward with an averagevelocity of 0.65 km·s −1 . The downﬂow velocity depends on the brightness of the elements, as well as on the height of thephotosphere layer in which the velocity is measured.
Nonlinear cosmogony of the spiral galaxy bulges
Authors: Botirov F.U. , Nuritdinov S.N.
Published: February 2022

An early idea of one of the authors of this work is being developed, where the mechanism of instability of the warpperturbation mode against the background of an non-stationary disk was proposed for the ﬁrst time in [1]. For this purpose,a model of a nonlinearly non-stationary self-gravitating disk with an anisotropic velocity diagram was ﬁrst constructed. Themodel has a composite nature, or rather, it is a superposition of isotropic and anisotropic states of the disk. A nonstationaryanalogue of the dispersion equation of this composite model in the general case is obtained. The behavior of the domeddisturbance mode, the instability of which leads to the formation of a classical bulge in the central region of the disk, isinvestigated. Critical diagrams of the dependence of the virial ratio on the degree of rotation of the system for various valuesof the superposition parameter and the corresponding diagrams for the increments of instability are constructed.
Optical light curves of light-weight supermassive black holes produced by the Zwicky Transient Facility Forced Photometry Service
Authors: Demianenko M. , Grishin K. , Toptun V. , Chilingarian I. , Katkov I. , Goradzhanov V. , Kuzmin I.
Published: February 2022

In this paper, we present an algorithm to correct optical light curves obtained using The Zwicky Transient Facility ForcedPhotometry Service and its application to the analysis of optical variability of 136 actvie galactic nuclei (AGN) pow-ered by “light-weight” supermassive black holes (SMBH; M BH < 2 ∗ 10 6 , M ⊙ ) including 24 intermediate-mass black holes(IMBH; M BH < 2 ∗ 10 5 , M ⊙ ). We detected variability in nearly all sources and also analyzed its dependence on theX-ray luminosity for 101 objects. We also identiﬁed a previously unknown candidate tidal disruption event (TDE) inSDSS J112637.74+513423.0.
An analysis of methods for determining corotation radii in galaxies
Authors: Marchuk A.A. , Mosenkov A.V. , Savchenko S.S.
Published: February 2022

In this paper, for the ﬁrst time, the pairwise agreement of various methods for determining the corotation radii in thediscs of galaxies is statistically analysed. General conclusions are drawn about the poor agreement of the methods used inthe literature. We create a sample of galaxies with corotation radii, for which diﬀerent methods provide consistent results.Based on this sample, in the case of more than one corotation radius we verify the predictions for the coupling of diﬀerentparts in the spiral structure and make conclusions about its lifetime.
Determination of the magnetic field strength and geometry in the accretion disks of AGNs
Authors: Piotrovich M. , Buliga S. , Natsvlishvili T.
Published: February 2022

Based on the spectropolarimetric data of 33 Seyfert type 1 galaxies observed with the BTA-6m telescope of the SpecialAstrophysical Observatory, we estimated the magnetic ﬁeld values at the event horizon of the supermassive black hole B Hand the exponents of the power-law dependence s of the magnetic ﬁeld on the radius. We used the model of Shakura-Sunyaevaccretion disk. The average value of log B H [G] was found to be ∼ 4. The average value of s is ≈ 1.7, and its distributionmaximum span is in the range of 1.85 < s < 2.0. This is a rather interesting result, since s = 5/4 is usually adoptedin calculations for Shakura-Sunyaev accretion disks. For two objects PG 1545+210 and 2MASX J06021107+2828382, themeasured degree of polarization is greater than the maximum possible value at the angle between the line of sight and theaxis of the accretion disk i = 45 ◦ . It was concluded that for these objects the angle should be closer to i = 60 ◦ .
Kinematic analysis of N -body galaxy models with barlenses
Authors: Zakharova D.A. , Tikhonenko I.S. , Smirnov A.A. , Sotnikova N.Ya.
Published: February 2022

The relationship between the three-dimensional structure of bars and their morphology in a face-on projection is not studiedin suﬃcient detail. In [1] and [2], we distinguished diﬀerent orbital components of bars with barlenses in several numericalmodels. In this work, we studied the impact of these orbital components on h 3 and h 4 parameters of the line-of-sight velocitydistribution Hermitian series expansion. For a typical model with a barlens, we found that h 4 minima lie outside the barlensregion. For individual orbital groups, we obtained that a more extended bl o family contributes to the negative regions ofh 4 proﬁle, while a more compact bl u group does not have any connection with these regions and exhibits fast rotation. Weconclude that the barlens orbital families do not contribute to the h 4 minima, which is the main kinematic signature of theB/PS bulges if the galaxy is viewed face-on.
On two forms of interstellar gas accretion in the formation of single stars
Authors: Abdulmyanov T.
Published: February 2022

In this paper, the mechanisms of star formation and the formation of the equatorial gas and dust disk of protostars areconsidered. The viscous dynamics of the interstellar matter of gas and dust disks is mainly determined by perturbations of thematter density during gas accretion onto the equilibrium core of the protostar. Using the model of pulsating perturbationsof the density of the gas-dust envelope of the protostar and the Navier-Stokes equations, the formulas for the dynamicviscosity of Keplerian and almost Keplerian disks are obtained. It is shown that in the regime of unstable equilibrium of theenvelope, accretion of gas onto the core of the protostar begins. In the regime of stable equilibrium, the fragmentation ofthe gas-dust envelope and the equatorial disk of the protostar occurs. In the ring-shaped fragments of the disk, the processof formation of “embryos” of planets begins and accretion on the “embryos” of the planet also begins.
Discovery and study of new white dwarfs by means of Gaia EDR3 accurate astrometry
Authors: Mickaelian A.M. , Mikayelyan G.A. , Abrahamyan H.V. , Paronyan G.M.
Published: February 2022

The discovery and study of new White Dwarfs (WDs) is extremely important for understanding the kinematics and dynamicsof the local stellar population. They are evolutionary signatures of the Milky Way, as most of stars pass through thisevolutionary stage. We have carried out a statistical analysis of the White Dwarfs Catalogue to establish their averagephysical properties. Based on these data, we have searched for new WDs using Gaia EDR3 accurate astrometry. It provideshuge amount of data to conﬁrm WDs and reveal many more such objects. Gaia’s astrometric accuracy allows more detailedstudies of WDs and many other stars. Using Gaia accurate data in combination with SDSS and DFBS low-dispersion spectraand additional multiwavelength data, we have revealed many new WDs. Many of them are subject for studies on binarityand variability. WDs among FBS blue stellar objects at high galactic latitudes have been searched and revealed. Searchfor high galactic latitude WDs in DFBS have also been carried out. Using the revealed and calculated characteristics, astatistical study of WD properties is being done.
Long-term multi-frequency studies of flaring activity from microquasars
Authors: Trushkin S. , Shevchenko A. , Bursov N. , Tsybulev P. , Nizhelsky N.
Published: February 2022

The long-term monitoring at RATAN-600 of studies of bright X-ray binary stars in various ranges of the electromagneticspectrum, a search and detailed study of correlations between variable X-ray, radio and gamma radiation was carried out.It is a key point for understanding the formation of jet emissions from accreting matter onto a black hole (or neutron star).From April 2019 For a year, we began to use the multi-azimuth measurement mode on the Southern Sector antenna systemwith a ﬂat reﬂector, when 31 measurements of ﬂux densities at frequencies 4.7, 8.6, 15 and 30 GHz of several giant CygnusX-3 ﬂares, SS433 [1] and GRS1915+105 bright ﬂashes were carried out for 5–6 hours around the culmination of the source.In January 2020, Cyg X-3 switched to a hyper-soft X-ray state, the exit from which in early February led to the brightest theradio ﬂash for the all history of its observations. The Cygnus X-3 ﬂow density increased from 5 mJy to 20 Jy at a frequencyof 4.7 GHz and up to 22 Jy at 2.3 GHz in 2–3 days. In multi-azimuthal observations in the beginning phase, we registered alinear law of increase in the ﬂux at times from 1 to 5 hours. Comparing the data of the space Gamma-ray telescopes (Swift,AGILE and Fermi) and the MAXI and NICER X-ray monitors on board the ISS, we found that ﬂaring events from the radioto the Gamma-rays are interrelated, which is a reﬂection of the causal relationship of physical processes in the accretiondisk and in jet emissions. The spectral and time dependence of the evolution of ﬂares allow us to model the synchrotronradiation of microquasars based on changes in the volume of jet emissions, the strength of their magnetic ﬁeld and the modeof generation and absorption of radio radiation from relativistic electrons. Radio ﬂares of the microquasar GRS1915+105,as a clear manifestation of a new jet activity, always have the character of a reaction to changes in the conditions forgenerating X-rays in the accretion disk (MAXI) and in the corona (Swift). We have studied in details periodic radio ﬂaresfrom the X-ray binary with bright Gamma-ray radiation LSI+61d303 for more than 60 orbital periods. Undoubtedly, thenature of these ﬂares changes dramatically depending on the known super-orbital 4.6-year period.
Public History
Authors: Li Na
Published: February 2022

The traditional history education in China has been challenged ever since the dawn of the twenty first century. This article argues that public history, as an emergent and reflective practice, constitutes an effective intervention into the traditional history education in three significant ways. These three aspects are learnable, but are not easily teachable through mere cosmetic reform of the current historical curriculum; the real changes should come from outside of the established frame of reference, i.e. history teachers with public history knowledge and skills. With an in-depth analysis of three national public history faculty training programs (2014-2019), the article further suggests that public history provides new direction in teaching the past in China.
Imaginar comunidades resilientes: gestión de riesgos, fortalecimiento y capacidades para la acción social
Authors: Chacón Marroquín Ivette
Published: February 2022

Los territorios en exclusión social han sido un fenómeno de ocupación humana y construcción del hábitat que se ha invisibilizado por décadas y constituyen aún una deuda social muy fuerte en la mayor parte de ciudades en América Latina. Las conurbaciones en San Salvador, El Salvador, no son la excepción. Estas se perfilan como territorios dinámicos donde se tiene una alta densidad de ocupación y los usos de suelo son discrepantes y desafiantes dentro de la planificación urbana. Territorios donde la violencia social hoy, la guerra civil en el pasado y los fenómenos naturales sostenidos han sumado vulnerabilidades a los habitantes en las comunidades más empobrecidas. Con la finalidad de crear territorios más dignos y ciudadanos más fuertes dentro de ellos, el estudio presenta el trabajo de una herramienta destinada a los gestores de desarrollo que a diario trabajan con la construcción social del hábitat. La propuesta de índice de resiliencia comunitaria (IRC) surge de la comparativa de dos comunidades urbanas en distintos momentos, en cuanto a intervención en proyectos de desarrollo, y que tiene la intención de aumentar la cantidad de alternativas de medición cualitativa para el alcance de resiliencia comunitaria. El índice, una herramienta flexible y abierta, permite a los gestores reconstruir sus instrumentos de medición en cuanto a presencia de resiliencia comunitaria para el fortalecimiento humano previo a las intervenciones territoriales; todo ello con el interés de hacer los proyectos de desarrollo más sostenibles y las capacidades de los participantes más duraderas en el tiempo. El IRC, sus elementos y finalidad se ponen al servicio de una Estrategia para la Gestión del Riesgo de Desastres (GRD) no basada exclusivamente en mediciones de acciones antrópicas y ambiente construido. La estrategia aquí presentada culmina en una propuesta modélica de imaginario para la construcción social de resiliencia comunitaria, un proceso y una meta simultáneos y en continua construcción.
ECA Estudios Centroamericanos, Vol. 76, No. 767, 2021: 413-450.
Migración inducida por el cambio climático en El Salvador: Influencia de la propiedad del suelo y los desastres climáticos de lento desarrollo
Authors: Marín Marielos Arlen
Published: February 2022

Investigaciones sobre los impactos del cambio climático han informado sobre los efectos de este en la migración poblacional, concentrándose frecuentemente en pequeños estados insulares o en eventos extremos. Esta investigación examinó si las familias salvadoreñas con inseguridad de la propiedad del suelo tenían una mayor probabilidad a que al menos un miembro de la familia emigrara después de sufrir los efectos vinculados con el cambio climático. El enfoque se concentró específicamente en inundaciones hidrológicas y sequías meteorológicas a través de una regresión logística binaria. Esta técnica estadística es frecuentemente utilizada en el estudio de migraciones, pero se modelaron las relaciones entre la propiedad del suelo y los desastres de lento desarrollo. Diferentes bases de datos se combinaron para analizar las variables, la Encuesta de Hogares y Propósitos Múltiples y la base de datos Des-Inventar. Los hallazgos empíricos sugieren que las variables a menudo afectan positiva o negativamente la migración de al menos un miembro de la familia según el tipo de tenencia, mostrando que la inseguridad en la misma impactó negativamente a la probabilidad de tener un miembro de la familia viviendo en el extranjero. Por otro lado, la diferenciación existente de acuerdo con el tipo de desastre asociado y la temporalidad de ocurrencia de los eventos ha sido un factor importante en la toma de decisión para migrar. Los resultados reivindican la importancia de estudiar el efecto acumulativo de los desastres en la migración internacional, así como las políticas de titularizaciones masivas.
ECA Estudios Centroamericanos, Vol. 76, No. 767, 2021: 524-544.
Celebración Eucarística del XXXII aniversario de los mártires de la UCA 13 de noviembre 2021
Authors: Oliva Andreu
Published: February 2022

Basados en los textos bíblicos que se leyeron en la celebración Eucarística en ocasión del XXXII aniversario de los mártires de la UCA, la homilía subraya cómo la palabra de Dios mantiene su actualidad hoy como palabra viva que ayuda a discernir entre el bien y mal y es eficaz cuando se escucha y se vive desde las realidades históricas.  Esta palabra despierta el deseo de servir al proyecto de Dios para la humanidad; servicio que puede desembocar en el martirio, como muestra de un amor y que se manifestó en la fidelidad de los mártires de la UCA a este proyecto.   Se ofrecen reflexiones sobre las manifestaciones del verdadero amor que motiva a los mártires a brindar la vida por el bien de los demás, lo que contrasta con el amor fingido de otros que prefieren la mentira y el ocultamiento de la verdad. Los mártires guiaron su vida y actuar por los siguientes valores: la verdad, la compasión, la misericordia, la justicia, la defensa de los pobres, la libertad y la dignidad humana; la solidaridad y la construcción de un país donde todos nos pudiéramos llamar hermanos y hermanas y vivir como tales.
ECA Estudios Centroamericanos, Vol. 76, No. 767, 2021: 553-558.
The short term efficacy of thoracic spinal manipulation on shoulder impingement syndrome
Authors:   , Booyens Ryan Patrick
Published: February 2022

Background: The most common shoulder complaint seen by physicians is shoulder impingement syndrome. There has been limited success with the current conservative treatment that has been provided for this condition. Thoracic spine and rib manipulation is purported to aid in the treatment of this condition; however there is a paucity of controlled investigations. The purpose of this study was to determine the short term efficacy of thoracic and prone rib manipulation on shoulder impingement syndrome. Methods: A randomised, placebo controlled pre-test post-test experimental design was used. Informed consent was obtained and 30 participants were recruited according to inclusion criteria and allocated to either a placebo or intervention group. Intervention consisted of thoracic spinal and rib manipulation. Data was collected, pre and post the first treatment and at a 48 hours follow up. SPSS was used to analyse the data with a p value of 0.05. Results: No statistically significant differences were seen between the groups for pain rating, range of motion of the glenohumeral joint, lateral scapula slide test or scapula isometric pinch test. The shoulder pain and disability index (SPADI) showed significant (p = 0.04) differences between the groups in terms of disability scores, with the intervention group having a great improvement in disability. No clinically significant differences were observed between the groups. Conclusion: Thoracic spine and rib manipulation appears to improve the disability associated with shoulder impingement syndrome, however further research is required with a larger sample size.
Evaluating the use of nursing care plans in general practice at a level 3 hospital in the Umgungundlovu district of KwaZulu-Natal : a case study
Authors:   , Maharaj Priscilla
Published: February 2022

Aim The aim of this study was to evaluate the use of nursing care plans in the management of patient care and to recommend guidelines for improving the quality of planned nursing care at a level 3 hospital in the Umgungundlovu district of KwaZulu-Natal. Method The case study was based on the conceptual model of care planning and employed both quantitative and qualitative research designs. The quantitative phase involved a retrospective audit of charts, using an itemised checklist to determine whether items relating to the phases of the nursing process were in evidence within the charts. The qualitative phase consisted of face-to-face interviews with registered nurses, who were asked about their understanding and use of the nursing process. Data derived were analysed using Nvivo 10 and presented as graphs, tables and written text extracts. Results The results show that the use of the standardised care plans at the study hospital had an impact on the understanding of the importance of the nursing process and the successful implementation of the care plans. Factors that had an impact on this included the registered nurses who failed to nurture the junior nurses, lack of understanding of the care plans and what was expected of the staff, staff attitudes and the heavy workload. Conclusion It was suggested that nurse leaders support the implementation and continued use of individualised care plans in order to improve critical thinking skills of nurses by implementing teaching and in-service programs, employing knowledgeable registered nurses, by developing and enforcing adherence to policies that favour care planning and nursing documentation.
An epidemiological investigation into primary headaches in an adolescent population in public high schools in the Westville Ward of the Pinetown School District
Authors:   , Crestani Melissa Maria Alessandra
Published: February 2022

AIM: The aim of the study is to determine the epidemiology of adolescents attending public high schools, in the Westville ward of the Pinetown School District, who present with a history of primary headaches. SUBJECTS: Adolescents between 14 and 19 years of age currently attending a public high school in the Westville Ward of the Pinetown School District. METHODOLOGY: Upon approval from the Department of Education (DoE) and principals of participating public high schools, an appropriate time-slot was identified in which the post-pilot questionnaire and letters of information and informed consent could be delivered to the scholars via the researcher. One class from Grade nine, Grade 10, Grade 11 and Grade 12, in each school, was randomly selected by a blind draw to participate in the study. A total of 460 completed informed consent and post-pilot questionnaires were collected and placed in separate sealed ballot boxes. All sealed ballot boxes were collected by the researcher. All post-pilot questionnaires were kept confidential and only seen by the researcher and supervisor. A code was allocated to each questionnaire before data was captured on a spreadsheet for data analysis by the chosen statistician. RESULTS: In total 460 questionnaires were utilised for statistical analysis. The results showed a high prevalence of Migraine-type headache (MTH) (17.2%) and Tension-type headache (TTH) (27.6%). However, no scholars were diagnosed with a Cluster-type headache (CTH). The majority of scholars (63.8%) did not seek medical attention or advice for their headaches. A history of experiencing headaches (p=<001), participation in sport (p=0.008), difficulty sleeping (p=<0.001) and sleep bruxism (p=0.007) were the only significant risk factors noted as statistically significant in this study. CONCLUSION: This study is consistent with previous studies on the high prevalence of primary headaches in an adolescent population. Primary headaches negatively affect the daily activities of adolescents; however, majority of adolescents do not seek medical attention or advice for their headaches.