A5073286361- Terahertz technology and applications
- Microwave Imaging and Scattering Analysis
- Photonic and Optical Devices
- Antenna Design and Optimization
- Thermography and Photoacoustic Techniques
- Microwave and Dielectric Measurement Techniques
- Microwave Engineering and Waveguides
- Random lasers and scattering media
- Advanced Optical Imaging Technologies
- Radiation Dose and Imaging
- Advanced Antenna and Metasurface Technologies
- Radiative Heat Transfer Studies
- Geophysical Methods and Applications
- Radiation Detection and Scintillator Technologies
- Plasmonic and Surface Plasmon Research
- Analytical Chemistry and Sensors
- Optical Coatings and Gratings
- Calibration and Measurement Techniques
- Advanced Surface Polishing Techniques
- Semiconductor Lasers and Optical Devices
- Infrared Thermography in Medicine
- Advanced Fiber Optic Sensors
- Electromagnetic Compatibility and Measurements
- Near-Field Optical Microscopy
- Radiation Effects and Dosimetry
O.Ya. Usikov Institute for Radiophysics and Electronics
2013-2023
National Academy of Sciences of Ukraine
2016-2023
Manchester Metropolitan University
2017
Taras Shevchenko National University of Kyiv
2016
Institute for Information Recording
2015
Samsung (South Korea)
2004-2008
Scientific Centre for Aerospace Research of the Earth
2007
Urals Research Center for Radiation Medicine
2007
The eyes of a prospective cohort 8,607 Chernobyl clean-up workers (liquidators) were assessed for cataract at 12 and 14 years after exposure. prevalence strictly age-related cataracts was low, as expected (only 3.9% had nuclear either examination), since 90% the younger than 55 age first examination. However, posterior subcapsular or cortical characteristic radiation exposure present in 25% subjects. data Stage 1 cataracts, specifically revealed significant dose response. When various end...
Chumak, V. V., Worgul, B. Kundiyev, Y. I., Sergiyenko, N. M., Vitte, P. Medvedovsky, C., Bakhanova, E. Junk, A. K., Kyrychenko, O. Y., Musijachenko, Sholom, S. Shylo, A., P., Xu, S., Xue, X. and Shore, R. Dosimetry for a Study of Low-Dose Radiation Cataracts among Chernobyl Clean-up Workers. Radiat. Res. 167, 606– 614 (2007).A cohort 8,607 Ukrainian clean-up workers during 1986–1987 was formed to study cataract formation after ionizing radiation exposure. eligibility required the...
A half-space electromagnetic model of human skin over the band 30-300 GHz was constructed and used to radiometric emissivity. The showed that emissivity rose from 0.4 0.8 this band, with emission being localized a layer approximately one millimeter deep in skin. Simulations differing water contents associated psoriasis, eczema, malignancy, thermal burn wounds indicated radiometry could be as non-contact technique detect monitor these conditions. sample 30 healthy volunteers, measured using...
The authors present transmission data, taken at Ka (36 GHz) and W (95 bands in the millimetre-wave region of electromagnetic spectrum, for various dressing materials used treatment management burn wounds.The results show that such are highly transparent (typically > 90% transmission) and, their dry state, will permit sensing surface skin through thick layers (> 2 cm) different dressings typically applied medical wounds.Furthermore, emissivity same frequency bands, regions human on arm...
This paper describes the experimental setup and measurements of emissivity porcine skin samples over band 80–100 GHz. Measurements were conducted on with without dressing materials before after application localized heat treatments. Experimental indicate that differences in mean values between unburned burned damaged was up to ~0.28, an measurement uncertainty ±0.005. Measured burn increases depth burn, indicating a possible non-contact technique for assessing degree burn. The dressed found...
The quasi-spiral 2D diffractive optical element (DOE) based on M-sequence of length N=15 is designed and manufactured. speckle suppression efficiency by the DOE rotation measured. coefficients 10.5, 6, 4 are obtained for green, violet, red laser beams, respectively. results numerical simulation experimental data show that binary structure can be as effective in reduction a periodic structure. decreases approximately twice at boundaries visible range. It shown replacement this with bilateral...
The operational concept and results of tests are presented for a prototype W-band passive imaging system based on planar diffraction antenna. A multi-beam (64 beams) rotating antenna pattern is formed due to the dispersive properties by around viewing axis means low power electromechanical drive. frequency bandwidth 16 GHz split into 64 sub-bands, one each 'beam'. Image formation at short distances, ~ several meters, possible with addition static lens in front unit; far field also without an...
A local plasmon resonance on a metal wedge is studied by using the Meixner approach [J. Meixner, IEEE Trans. Antennas Propag.AP-20, 442 (1972)]. It found that singular field behavior of as function distance from edge sensitive to wavelength and angle, ranges dramatic increase in amplitude close its theoretical limit pure oscillatory with only minor variation. Field singularities for gold, silver, aluminum wedges are calculated. shown that, unlike an ideal-conductor wedge, real part power...
A technique to measure the human skin emissivity in vivo is described for frequency band 80-100 GHz. Emissivity measurements were performed on 60 participants, 35 males and 25 females, with ages ranging from 20 years. Results show that of higher than females. The study suggests a trend emissivities age gender, which might be due variations thickness water content. As non-contact screening desirable medical applications, passive millimeter-wave sensing could means achieving this diagnosis...
The principles of formation antennas diffraction radiation with flat surface in the millimeter wave radio band are considered. Such kinds based on effect conversion volumetric electromagnetic waves into a dielectric waveguide an open electrodynamic structure. A brief description theoretical basis for calculations and examples technical implementation (2D) W-band Ka-band presented; their parameters areas possible use discussed. In <i>E</i>-plane angle-to-frequency dependence beam position is...
Millimeter-wave imaging may be used to assist in the problem of wastepaper recognition during sorting and recycling process. Currently, there are a variety techniques, which within materials recovery facilities sort waste paper card; however, improvements capability can realized using multiple sensors provide complementary (orthogonal) data. This discusses issues related processes, currently for recycled phenomenology millimeter-wave material. Experimental measurements images millimeter wave...
In order to address the problem of characterisation high dose rate workplace fields, unique techniques and devices have been developed tested. The kit comprises a passive spectrometric system six-vector collimator with thermoluminiscent detectors (TLDs) inside, allowing determination anisotropy radiation field, both horizontal vertical. makes use simultaneous exposure several TLDs placed inside spherical attenuators. Deconvolution gamma spectra is performed by solving linear equations....
A new interferometric vibration sensor for testing both and subsidiary resonance that have detrimental effects on the servo performance of optical pickup actuator is presented. Experimental results slim actuators obtained from sub-resonance tester such as are It can be also used other applications in R&D domain production environments with a low price compact size.
The article considers the results of experimental studies parameters focused beams formed in W-band planar antennas diffraction radiation using an axial dielectric lens and at focal lengths from tens centimeters to several meters. focusing beam was carried out utilizing a set replaceable lenses with calculated distance 1,5 m, 3 6 m. mode also considered two installed series, jointly providing about 0,8 Evaluation operating electrodynamic system consisting waveguide grating both located near...
We present a method for testing phase characteristics of optical pickup head actuators with subsidiary resonance. This resonance detrimentally affects the servo performance actuators. The interferometric employs simple cube type beam splitter one diffused surface and measures vibration response function actuator.