Browse

The geomagnetic field varies in time and space, being a signal composed of periodic and non-periodic elements and is monitored in a tri-axial system within the geomagnetic observatories of the INTERMAGNET network across the planet. In the work, based on these data, we use for spectral evaluation (Fourier, wavelet, signal decompositions in approximations and details with various functions on different levels, etc.) in order to analyze different geomagnetic phenomena (such as: geomagnetic storms, disturbances, etc.)...

The issue of improving the shape of paraboloidal surfaces of transformable reflectors is still considered one of the most challenging problems. In modern transformable reflectors, the paraboloidal shape of the center of deployable reflectors is ensured by placing nodes of a flexible tape grid. It is accepted that the maximum accuracy of the parabolic surface is achieved under conditions of equal loads of the nodes. Changes in the geometry of the paraboloidal surface of the reflectors mainly develop in the peripher...

The hypersonic technologies for the means of launching spacecraft into suborbital and near-earth orbits, as well as for unmanned systems, combining both shock qualities and intelligence functions working in very not favorable conditions. The impact of the ultrasonic beam on inertial navigation devices of launching spacecraft , in particular, in a multi-phase, in hypersonic conditions was not investigated. Excess heat that is released during the operation of integrating gyroscopes heats the air outside the housing....

Connected to the vision of bringing space closer to human beings, space tourism starts to become a new exciting free-time spending possibility allowing experiencing new unknown courageous activities linked to the possibility of viewing Earth from space. There are various types of space tourism such as orbital, suborbital and lunar ones. At the same time a big provocation for space tourists is to feel weightlessness and floating in space as the unique chance to contribute in a personal manner to advance science. As...