Magnetic Resonance Cardiorhythmography as a Method of Study of Human's Cardiovascular System Condition

AbstractIn this article a highly sensitive method for graphic recording of cardiogram by detecting the signal of nuclear magnetic resonance (NMR) of human finger has been developed and signals directly related to movement of blood ejected by the heart into the vessels have been studied. Changes in the behavior of signals depending on the condition of the cardiovascular system of person have been discovered

Laser Polarimeter for Measurement of Optical Activity of Biological Objects

AbstractIn this paper has been described the polarimetric device for measurement of optical activity of biological tissues, where the source of radiation is an infrared laser with a wave λ=0.808 micron. The polarizers used are polarizing prisms of Glan – Taylor. To obtain required angular resolution (0.180/cm) has been developed a device that converts the angle of rotation of the analyzer into electrical signal, which is fed to the appropriate scan digital oscilloscope. The passage of the polarized light through the fingers of the hand was established and the angles of rotation of the polarization vector of the transmitted radiation were measured, the values of which may be determined by the content of hemoglobin in the blood

Influence of gold nanorods size on electro-optical and dielectric properties of ferroelectric liquid crystals

The influence of the gold nanorods (GNRs) diameter on the electro-optic and dielectric properties of the ferroelectric liquid crystals (FLCs) was investigated. It was shown that dispersing of GNRs in FLCs could lead to an increase of the internal electric field inside the liquid crystalline layer. This effect results in a significant decrease of the switching time and the rotational viscosity of the FLC/GNRs nanodispersions independently on the GNRs diameter. Oppositely, the relaxation frequency and the dielectric strength of the Goldstone mode strongly depend on the GNRs diameter, which can be explained by the charge transfer between the GNRs and FLC molecules. © 2010 American Institute of Physics

Nonlinear electrophoretic motion of dielectric microparticles in nematic liquid crystals

The motion of dielectric microparticles induced by external ac electric field, E, was investigated in the cell with in-plane stripe electrodes and filled with homeotropically aligned nematic liquid crystal. It was demonstrated that the average velocity of the microparticles depended on the third power of the electric field strength (v= μ (3) E3). The experimental results were explained by the induced charge electrophoresis. © 2010 American Institute of Physics

Nonlinear motion of dielectric microparticles in nematic liquid crystal under strong electric field

Nonlinear electrophoretic motion of spherical dielectricmicroparticles in a cell filled with nematic liquid crystal was experimentally studied for the first time. It was shown that the average microparticle velocity vEPH depends on the cubic electric field strength E, vEPH ∼ E3. It was found that the signal shape of the control electric field has no effect on the functional dependence vEPH(E3). © 2009 Allerton Press, Inc

Unexpected Reaction of Ethyl 4-(Chloromethyl)pyrazolo- [5,1-c][1,2,4]triazine-3-carboxylates with Thiourea and Its Mechanism

The reaction of ethyl 4-(chloromethyl)pyrazolo[5,1-c][1,2,4]triazine-3-carboxylates with thiourea in dimethylformamide involves ANRORC rearrangement (Addition of the Nucleophile, Ring Opening, and Ring Closure) followed by N-formylation to give N-{5-(4-oxo-8-phenyl-1,4-dihydropyrazolo[5,1-c][1,2,4]-triazin-3-yl)-1,3-triazol-2-yl}formamides whose structure was confirmed by X-ray analysis. The reaction mechanism has been studied by HPLC/MS. © 2018, Pleiades Publishing, Ltd

Experimental creation of chainlike beams and investigation of their structure

The effect of the Gaussian beam width on the focusing properties of the chainlike Gaussian beam formed upon diffraction of laser radiation on a binary amplitude mask is studied. It is found that a decrease in the Gaussian beam width increases the sizes of focal spots and the focus depth, decreases the intensity in the focuses, and does not affect the focus position. © 2008 Pleiades Publishing, Ltd