The purpose of this article is to identify and investigate the factors affecting the accuracy of the control mechanism. The analysis has shown that the accuracy of the structure control is also affected by the cardan connection, including those associated with its manufacturing error. The analysis made it possible to propose methods for improving the hexapod design and control accuracy.

The paper considers an active reconfigurable reflector based on an active metamaterial with the possibility of dynamic control of antenna characteristics. Due to the use of the developed design, it is possible to ensure the formation of a multifunctional dynamically tunable antenna. It is capable of generating both omnidirectional radiation and directed in the main directions: 0, 45, 90, 135, 180, 225, 270, 315 degrees. Using switching devices (pin-diodes) it is possible to achieve fast switching of antenna operating modes, as well as to ensure the operation of an active reflector in a wide frequency range. The results obtained during the simulation are supported by experimental studies of the antenna model with a reflector. Switching of operating modes is possible based on a computer.

No abstract

This publication updates the issue of public awareness and highlights the basic rules of professional and individual oral hygiene in the presence of implants. A low level of knowledge of the specifics of care during and after implant treatment leads to the risk of peri-implant diseases. This article contains basic algorithms for the prevention of such complications.

No abstract