Browse

The aim of the research is to reveal age features of the response of healthy volunteers' cardiovascular system to the geomagnetic activity in subauroral area (Yakutsk). To achieve this goal, in 2014, March - April, during 60 days there has been holding a daily monitoring of the condition of the cardiovascular system of the healthy volunteers. There were 2 groups of them. In the 1st group there were medical students of an average age 22,3±1,7 years old (16 persons). The 2nd group contained members of the Y.G. Shafe...

The problem of quenching small vibrations of a mechanical system near its equilibrium position is considered. A method for finding switching points of piecewise constant control for simultaneous damping of several vibrations of the same frequency is proposed. As an optimized functional "the Expenditure" is considered. The method leads to explicit formulas. All results of research are formulated as the theorem. As an example the problem of stabilizing the spacecraft's rotation axis is considered. The mathematical m...

Human societies have had to face various forms of threat, since the onset of our predecessors. For societies to survive they must be capable adapting to the fluctuations of environment, reinventing established society models and leverage development of technologies. Aside from securing sustainable society, development and implementation of technologies for defense against war conflicts, various forms of armed violence, including terrorism, but also natural disasters, epidemics or pandemics is indispensable endeavo...

This work considers the study of libration dynamics of the planets? moons. To analysis such processes, it is necessary to use methods for investigating complex systems, as an influence from neighboring celestial bodies on spin-orbital motion of a moon should be taken into account. This fully applies to the Moon?s rotation about its axis. The construction of modern theories of the physical libration of the Moon (PLM) is based on gravimetric, seismic, satellite observations, and lunar laser ranging, which in its tur...

The polar geocosmophysical observatory is located in the Arctic zone of Russia in Tixie Bay with the following geographical coordinates: the latitude is 71.60 ° N, the longitude is 128.90 ° E. The first optical observations began in 1957. At present the continuous geophysical measurements of variations of the Earth?s magnetic field, auroral absorption of radio waves, ionosphere features, very low-frequency electromagnetic radio emissions, optical glow of the night sky and aurorae as well as cosmic ray intensities ...

The information obtained during remote sensing of our planet from space is used by a large complex of Earth sciences (in geography, geology, volcanology, geoinformatics, cartography, climatology, meteorology, oceanology, seismology, etc.), to solve applied problems in many areas of human activity and in other purposes. These «other» objectives generally refer to various aspects of military applications. Along with the obvious necessity and importance of using space methods in cartography and geodesy (recognition a...

The Auto-Regressive Integrated Moving Average (ARIMA) model is widely used to forecast non-stationary time series data. In a model of ARIMA (p, d, q), AR is autoregressive, p is the number of regression terms, MA is the moving average, q is the number of moving average terms, and d is the difference time to make the data a stationary series. It can be used to forecast the trend of geomagnetic disturbances. Firstly, the non-stationary historical data xt is processed by the d difference to develop the stable histori...

In this work, the physical parameters of near Earth objects (NEO) are studied. The search for parent bodies of low-activity small meteor showers ? k-Cygnids, ?-Cancrids, and Virginids are performed among asteroids that could be faded comets. For k-Cygnids by all the catalogues of meteor orbits 2 asteroids are selected ? 153311 2001MG1, 385343 2002LV, whose orbits provide from 90% to 100% compliance with meteoroids? orbits of a shower. The 2012LL9 is only selected by 3 catalogues of meteor orbits. By catalogue of A...

This work focuses on the creation of a selenocentric satellite simulation navigation system (SSSNS) using a set of reference objects on the lunar surface. The latter is based on the data from the modern space missions ?LRO?, ?Clementine?, ?GRAIL? (all ? NASA, USA), ?SELENE? (JAXA, Japan), and ?SMART-1? (European Space Agency). The SSSNS was created to transform measurements taken from in-orbit satellite into the selenocentric inertial reference system. The measurements should be taken by on-board altimeter and las...

Mons Rumker, located in the northern part of the near side of the moon, was chosen as the landing site for the future Chinese mission Chang'e-5. The launch of the mission is planned for the end of 2020. This will be the first Chinese mission in which it is planned to return to Earth and deliver samples of lunar soil. The probe will consist of two parts: orbital and landing modules. The landing module will be equipped with a drilling rig capable of taking soil samples from a depth of up to 2 meters. In this paper, ...

The aim of the present article is to research the response of the cardiovascular system of healthy volunteers to change in heliogeomagnetic activity in subauroral area (Yakutsk) in the minimum (year 2009) and in the maximum (year 2014) of the 24th 11-year solar cycle. The condition of the volunteers' cardiovascular system has been estimated according to the T-wave symmetry coefficient in the electrocardiogram (TSC), which displays the processes of myocard repolarization. Heliogeomagnetic activity has been estimate...

This work focuses on the use of projective geometry methods to determine star positions produced on the basis of positional observations. As is known, projective geometry studies invariant projective transformations. The main feature of projective geometry is the principle of duality, which adds elegant symmetry to many designs. While the properties of the figures that Euclidean geometry deals with are metric, but there are figures that can be converted into one another by movement while maintaining the metric pro...