Physiological correlates of neuro- and magnetic stimulation in therapy of epilepsy

In the literature survey, non-pharmaceutical methods of therapy of epilepsy are considered including electrostimulation of vagus nerve, exposure to magnetic field and transcranial magnetic stimulation (TMS). Correlates of the effectiveness of electro- and magnetic stimulation are electrophysiological parameters, clinical data and influence on the mental and cognitive functions. Use of repetitive transcranial magnetic stimulation in addition to antiepileptic drugs has a certain ground. According to modern understanding and the results of experimental studies, the mechanism of modulator inhibitory alterations is associated with a potential of TMS to cause long-term synaptic depression or long-term potentiation. These long-lasting phenomena probably underlie anticonvulsant effects of low frequency magnetic stimulation. Inclusion of physiologists and neurophysiologists into the research will permit to solve such an important problem as a study of physiological mechanisms of the effectiveness of non-pharmacological electro- and magnetic action in epilepsy.

Твердотельный изгибно-вибрационный датчик низкочастотного магнитного поля на основе пьезоэлектрического эффекта

Optimal geometrical and electrophysical parameters are calculated theoretically; the effective response of a solid-state hybrid “magnet–carbon—piezoelectric” sensor is studied experimentally. Experiments are performed under the action of an external magnetic field of low-frequency flexural resonances (from 1 to 230 Hz). Theoretical calculations have formed the basis for designing an experimental prototype of the instrument. The frequency dependence of the direct piezoelectric response to the applied small-signal varying magnetic action is constructed.

Kepler, Johannes (1571–1630)

Kepler’s mathematical analysis of Brahe’s observations of the motions of Mars enabled him to formulate the descriptive ‘laws’ of planetary motion, thus giving heliocentric astronomy an empirical basis far more accurate than it had before. He insisted that astronomy had to discover the causes of the motions that the laws described, in this way becoming a ‘physics of the sky’. In the pursuit of this goal, he formulated the notion of distance-dependent forces between sun and planet, and guessed that gravity could be explained as an attraction between heavy bodies and their home planets, analogous to magnetic action, thus pointing the way for Newton’s theory of gravity.

Interaction force between magnetic field and ferromagnetic target: analytical, numerical and experimental study

In this study, an analytical model and a finite element (FE) model were developed in order to study the force produced by a permanent magnet on a ferromagnetic target. The study was aimed at estimating the magnetic action in order to design an excitation device for vibration tests. The dynamic analysis of rotating structures as compressors’ bladed wheels requires a solicitation that reflects the operational conditions. If the component is made of ferromagnetic material, it is possible to use magnetic fields for the excitation. The present paper reports the interaction between planar parallel surfaces, first studied analytically and numerically, and the results were compared with experimental results. Then the interaction between sloping surfaces was analyzed, allowing an analytical boundary loss model to be developed. Finally, the FE model was improved to study the interaction between double curvature surfaces. A comparison with experimental results measured on an actual bladed wheel was performed.

Prepared Patterned Magnetic Composite Microspheres by Emulsion Polymerization

The patterned magnetic composite microspheres with Fe3O4as core and styrene polymer as shell have been prepared by emulsion polymerization, while the size of microspheres is about 150-200nm. The composite microspheres were characterized by FT-IR, TEM, and TG et al. The measurement results showed that: the magnetic composites were orderly arranged to form a straight line, rhombus, triangle, five-rings-shaped, plum-shaped, six-membered ring geometry by own magnetic action. The structure of microspheres was spherical, the size was uniform and performance is stable.