The result of measurement of the cross-polarized component of the reflected field from liquids with different permittivity are presented. The cross-polarized component of the field is observed for liquid dielectrics with a large value of the imaginary part of the complex permittivity. The mechanism of excitation of this component is proposed.
The meteorological situation, which depend on the climatic features of the geographical region, have a significant impact on the propagation of ultrashort radio waves. This work presents the results of a study of the variability of the refractive properties of the surface atmospheric layer in the city of Ulan-Ude influence on the level of the UHF signal in July and October 2021. According to the data from the meteorological station of the city of Ulan-Ude, we calculated the atmospheric refraction. The measurement of the received signal level has been with a Rohde &Schwarz portable TV signal analyzer. We found a high correlation between the averaged signals with refraction.
Seasonal variability of the vertical structure of the atmosphere leads to "slow" fading of the VHF signal level at the receiving point. They are attributed to smooth changes in the layered factors that determine the average refractivity gradient of the atmosphere. Statistical characteristics of temporal changes in the refractive properties of the atmosphere are necessary, for example, for a quantitative assessment of the fluctuation and energy characteristics of a signal during long-range tropospheric propagation of VHF. The paper presents the dynamics of the vertical temperature gradient and the calculation of the vertical gradients of humidity, refraction, as well as the dry and wet components of the refraction of the surface atmosphere according to the data of the aerological station Ust-Barguzin.
The paper shows possibilities of wavelet coherence methods for estimat ion of the optical electromagnetic radiatio n influence on biomedical signals, which characterizes the functional state of the human heart. An analysis of the wavelet coherence coefficients between pulse signals in the dark and ones under the influence of the preferred color light shows that there is a good correlation between the wavelet spectra at low frequencies and a partial correlat ion at frequencies close to the basic heart rate. Under the influence of the rejected color light, there is a good correlation of the wavelet spectra at frequencies close to the fundamental pulse rate, but there is no correlation at low frequencies.
The paper shows a possibility of quantitative assessment of the functional state of the human regulatory systems by the parameters of pulse signals and the heart rate variability obtained under the influence of optical radiation of different wavelengths. Contrasting photostimuli have been used in the experimental pulse measurements in order to observe the response of the organism to the impact of the optical stimuli. The psychophysical and the physiological state of the subjects who took part in the experiment showed definite changes under the influence optical stimuli, which means that pulsations are very sensitive towards various stimuli, among which optical stimuli are very important. Contrasting stimuli were chosen for the experimental measurements, actually red and blue, because these colors refer to the opposite parts of the optical spectrum and the difference of the influence of contrasting colors on the organism is very prominent. The tests confirmed that the influence of light belongs to promising technologies for psychophysical and physiological control of a human organism.
The paper shows the quantitative estimation of the electromagnetic optical radiation influence on the functional state of a human organism by analyzing pulse signals. It has been established that under the influence of the color preferred by the test subject, in comparison with its initial values, the absolute value of the Power Coefficient rises; the variability of the Hilbert-Huang characteristics rises; the analysis of the heart rate indicates the improvement of the functional state of an organism. Under the influence of a rejected color, the characteristics of a pulse wave indicate a decline in the functional state of an organism.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.