Determination of integral characteristics of the functions of sub-micron aerosol fraction size distribution density using optical measurements data

Web of Science: A1984TH03200006International audienceA simple method is described which may be used to determine the values of integral functionals from the functions of disperse media size distribution density with the measured characteristics of scattered radiation. The theory of the method is given, its potentialities illustrated by numerical experiment

Interferometry of inhomogeneous-media with short-length radiation coherence

Web of Science: A1979JD13300005International audienceThe spatial structure of stratified media is measured by the interferometric method with the resolution of 100 microns

Dynamics of optical parameters of the stratospheric aerosol layer following the eruption of Mt Pinatubo from lidar data

Web of Science: A1997XF40200005International audienceAn experimental investigation of the dynamics of stratospheric aerosol layer following the eruption of Mt, Pinatubo has been carried out at the lidar station of the Stepanov Institute of Physics, Belarussian Academy of Sciences (Minsk, 53.85 degrees N, 27.5 degrees E). Stable regularities in the behavior of the stratospheric aerosol layer following the eruption of Mt. Pinatubo are established from a statistical analysis of vertical profiles of the total-to-Rayleigh backscattering ratio, These profiles are classified and their dynamics are investigated in terms of the profile classes

Dynamics of the optical parameters of the Pinatubo aerosol layer from spectral polarization lidar measurements

Web of Science: 000085781800012International audienceThe dynamics of the optical parameters of stratospheric aerosol produced by the Mt. Pinatubo eruption is given. Measurements were carried out using a two-wavelength lidar with operating wavelengths of 532 and 1064 nm. The processing procedure of the data obtained with two-wavelength polarization laser sounding is described. The aerosol backscattering coefficient and depolarization coefficient at a wavelength of 532 nm and the ratio of the backscattering coefficients taken at two wavelengths are given in the form of isolines in the height-time plane. Possible temporal transformations of stratospheric-aerosol microphysical characteristics governing variations in the optical parameters are discussed

Processes of long-term relaxation of stratospheric aerosol layer in Northern Hemisphere midlatitudes after a powerful volcanic eruption

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Experimental Setup for Neutron Lifetime Measurements with a Large Gravitational Trap at Low Temperatures

International audienceCurrently the most accurate measurements of neutron lifetime are being performed at the Petersburg Nuclear Physics Institute with ultracold neutrons (UCNs) stored in a gravitational trap. A modified setup with a large gravitational trap and cooling to 10–15 K is presented. The results of measurements of temperature dependence of UCN losses in collisions with walls, which were coated with a perfluorinated grease (Fomblin UT 18), at 300–77 K, are detailed. The probable heat inflow to the trap is estimated, and the feasibility of cooling to indicated temperatures in experiments with the modified setup is demonstrated