GPR Pulse Propagation Topography

In this article, I propose a new method for calculating and visualizing the pulse radiation within the depth range commonly used by Ground Penetrating Radar (GPR). The text describes the method and illustrates the propagation with several examples. One conventional method is also applied for a quick comparison. The method can be used to optimize GPR antennas and transmit pulse shapes.

Laser therapy in patients operated for orthognathic pathology

The study is carried out with an emphasis on modern aspects of the diagnosis and treatment of patients with orthognathic disorders in the dynamics of laser therapy of different wavelengths, frequency and intensity parameters, dosed in pulse mode. It has been noted that the consistent use of laser low-intensity pulse radiation (ƛ=635nm) and laser low-intensity pulse radiation (l’904nm) increases the effectiveness of rehabilitation of dental patients in the early postoperative period, which is confirmed by the regression of initial shifts of microhemoregulatory indicators. The article demonstrates the feasibility and high efficiency of the application of complex physiotherapy, including laser radiation after orthognathic operations.

Suppression of postpulse oscillations in active bow-tie antennas

Subject and Purpose. This theoretical and experimental research is devoted to peculiarities of the ultra-wide bandwidth (UWB) pulse radiation from active bow-tie dipoles. The focus is on the relationship between the amplitude-time dependences of electromagnetic fields produced by active UWB pulsed antennas and the configuration of the conductive components for temporally short (less than 0.5 ns), ultra-wide-bandwidth pulse radiation. Methods and Methodology. Analysis of the radiator geometry action on the emitted pulse parameters is performed by numerical simulation with the use of the finite-difference time-domain (FDTD) method. The experiment involves specially made, variously shaped bow-tie radiators tested with different resistive loadings in radiation mode. The numerically simulated characteristic curves of the radiated field amplitude shape versus radiator geometry are confirmed by experiment. Radiation field parameters versus load resistance are experimentally studied, too. Results. Conditions for the effective pulse radiation with a largest-possible pulse amplitude have been determined, the post-pulse oscillation amplitude and duration reduced to a minimum. Conclusion. It has been shown that the resistive loading in the excitation area significantly reduces amplitudes and durations of post-pulse oscillations in signals radiated by active dipole antennas.

The State Fund of Metrology of Russian Federation. Part 2. General-purpose, pulse and special dosimeters

Lists of photon radiation dosimeters, as well as pulse radiation dosimeters and metrological dosimeters, included in the State Information Fund of Measuring Instruments of the Russian Federation are given. The results of a comparative analysis of the characteristics of these dosimeters groups are discussed.