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The theoretical and experimental investigation of the irradiation of biological solutions by impulse electromagnetic field is carried out. The problem of optimization of construction and sizes of the apparatus for the homogeneous irradiation is investigated by direct numerical calculation in time domain. Uniformity of a heat distribution of biological solution is studied. The experimental results...
Ways of practical implementation of matrix radiometric systems (multibeam antennas and multichannel radiometric receivers), located onboard of various purpose aircrafts, intended for creation of images of ground-based objects have been substantiated. It is shown that formation of two-dimensional images for a short exposure time is possible both owing to application of the matrix radiometric information...
Plane circular antenna as array of Tapered Slot Antennas (TSA) with video-pulse signals excitation has been proposed. The characteristics of space-time domain form of the field, radiated by plane circular array have been calculated and analyzed. Experimental measurement was done, which results were matched with the results of simulation. The possibility of radiation pattern synthesis through steaming...
An example of the multi-beam antenna with a group irradiator, the implementation of which will be available in the millimeter wave range. As the group proposed irradiator holder of the dielectric rod antenna axial radiation. The calculation of the basic characteristics of the antenna in the 8-mm band. It is shown that the arrangement of the illuminator group antenna two-mirror design does not deteriorate...
A model for calculation of wave form and peak power pattern of Van Atta's array of tapered slot antennas (TSA) which reradiates wideband video-pulse signal has been presented. An influence of mutual coupling of elements of Van Atta's array on pattern has been shown. An effect of different types of polarities of connecting wires on a wave form of reradiated signal has been investigated.
The analytical expressions for the dispersion in estimating dispersion of the potential precision in coordinate determining of complex shape ground based objects both area and extended are obtained via the matrix radiometer systems of remote sensing. Quantitative evaluation evidences establishing with the required accuracy the position of area ground object as a set of rectangles with the matrix radiometer...
Effects of ultra-wideband radiation (UWBR) on isolated cells of human buccal epithelium are presented. Cells were isolated from human organism before experiment and suspension of cells was exposed during 10 seconds to UWBR of 10−6 – 10−2 W/cm2 intensity. In different periods after exposure to UWBR cells were stained with fluorescent stains Hoechst 3342 and ethidium bromide in purpose to assess their...
To implement a novel method of investigation of electromagnetic field action on state of cell nucleus the simulation of irradiation of the cells of human buccal epithelium by electromagnetic field of EMF band is carried out. The cells were exposed to radiation of frequency f=36.64 GHz, with power densities W = 10−1, 1 and 4 W/m2 during 10 seconds. To answer on the question of existence of nonthermal...
The method of evaluation of radome heating influence on actual images formed by the matrix radiometric extreme-correlated system of aircraft navigation was developed. The method allows taking into account the layered pattern of radome and heating irregularity from layer to layer and in direction of a radome guiding line. The method takes into account the interference of frequency components of radiation...
A time-domain characteristic of the field radiated by a circular TSA array has been investigated in paper. The possibility of patterns synthesis by excitation polarities of circular array element has been showed. The results of experimental measurements have coincided with the simulation results.
Research works on biological effects of ultrawideband pulsed radiation which were realized in the Kharkiv National University are summarized. Investigations were done on different biological objects: human cells, Artemia sp., Drosophila melanogaster. Biological effects of ultrawideband pulsed radiation were observed in a range from 10-6 to 10-2 W/cm2. Different experimental models revealed different...
The experimental data obtained since 2000 concerning cellular and molecular effects evoked in biological systems by exposure to ultrawideband ultrashort pulsed radiation and microwave radiation are discussed. The most significant cellular effects of electromagnetic fields exposure, such as: apoptosis, cell proliferation, genotoxic effects, and some underlining molecular processes are considered. Conclusion:...
Isolated human buccal epithelium cells were irradiated by microwaves of frequency f=36.64 GHz, surface power density E = 10−2, 10−1, and 1 W/m2, exposure time 10 s. The state of cell membranes was evaluated by the method of vital indigo-carmine and trypan blue staining. The percentage of unstained cells after irradiation at E = 10−1 and 1 W/m2 decreased as a result of the microwave radiation exposure...
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