Effects of millimeter-wave electromagnetic radiation (40 GHz frequency, 0.01 mW power) on the spontaneous fi ring of convergent neurons of the spinal trigeminal nucleus and their responses to ...electrical stimulation of the dura mater were studied in neurophysiological experiments on rats. Irradiation of the area of cutaneous receptive fields of spinal trigeminal nucleus reversibly inhibited both spontaneous discharges and activity induced by electrical stimulation of the dura mater. The second and third exposures to electromagnetic radiation with an interval of 10 min were ineffective. These results suggest that suppression of neuronal excitability in the spinal trigeminal ganglion can be a mechanism of the anti-migraine effects of electromagnetic radiation observed in clinical practice.
Non-Linear Effects in Configurable Antenna Gavva, D. S.; Medvedev, Eugene; Ivanova, Olena ...
Radioelectronics and communications systems,
2018/3, Letnik:
61, Številka:
3
Journal Article
Recenzirano
Current-technology different data transmission standards communication systems are commonly built with application of configurable antennas. Non-linear components including in radiating structure of ...antenna allows to expand the antenna functionability (operating frequency change, modification of the radiation pattern, change of polarization, input impedance, etc.), but also it can result in non-linear effects appear that distort antenna characteristics and transmitted data. In this connection in this paper there are considered actual problems such as methods of numerical analysis of non-linear effects in configurable antennas, specificities of switching components used in antennas, numerical research of influence of voltage-capacity characteristics of radiating structure switch and excitation power on antenna characteristics. Carried out estimated researches allow to obtain general representations and predict nonlinear distortions in configurable antennas caused by used different types switches.
A new algorithm is presented for the formation of an analytical time scale that takes into account the fluctuations of atomic clock signal frequencies over several time scales. Numerical simulation ...shows that the algorithm can obtain a group time scale for an ensemble of atomic clocks with rather high frequency stability characteristics. The proposed algorithm is compared with the algorithm for calculating a time scale based on the Kalman filter.
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•The MCE of Gd2O3 nanoparticles obtained by spark discharge has been studied.•Variations of the spark discharge parameters changes the structure of nanoparticles.•The magnitude of the ...MCE depends on the structure of the Gd2O3 nanoparticles.•Gd2O3 nanoparticles is a promising material for cryogenic magnetic cooling.•Spark discharge is a useful technology for manufacturing of Gd2O3 nanoparticles.
Several batches of nanoparticles of gadolinium oxide Gd2O3 were obtained by the electrophysical spark discharge (ESD) method using selected variations of the value of the energy supplied to the discharge gap. The change of the charge voltage led to a change in the energy supplied to the discharge gap in the range of 3 J to 55 J. The average size of spark discharge nanoparticles in all cases was close to 8 nm in accordance with low-temperature nitrogen adsorption data. Gd2O3 nanoparticles contained two crystalline phases (cubic and monoclinic), the amount of which varied within certain limits by changing the parameters of the spark discharge. The obtained maximum values of the magnetic entropy change ΔSM of the studied ESD Gd2O3 nanoparticles with a monoclinic phase content of less than 40 wt% are not inferior to the value of ΔSM of Gd2O3 nanoparticles obtained by chemical methods. The spark discharge technique seems to be a promising technology for manufacturing of gadolinium oxide nanoparticles applications for the magnetic cooling systems of cryogenic refrigeration.
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