Application of probing dusty particles to investigation of a stratified discharge with dusty plasma structures in a magnetic field

Experimental investigation of a stratified discharge in a magnetic field with the help of probe dusty particles falling through the discharge under the gravity force is described. The radial and azimuthal accelerations of probe particles in the stratum volume are measured. It is found that the particles move in the stratum without accelerations except in two regions. In the first region, the acceleration has two components directed toward the tube axis and upward, whereas, in the second region, they are directed toward the tube wall and downward.     

Thermal expansion of water in fine pores

The relative expansion of water in pores about 50 Å in size has been investigated within the temperature range of 0 to 90°C. It has been established that at a temperature higher than 70°C, the runs of curves in pores and the bulk phase coincide. This demonstrates that the structural peculiarities of water disappear at these temperatures. Comparison between the plotted curves enables one to evaluate the density of water in pores, which at room temperature differs from the bulk density by about 2%.     

Extension dimension and quasi-finite CW-complexes

We extend the definition of quasi-finite complexes from countable complexes to arbitrary ones and provide a characterization of quasi-finite complexes in terms of L-invertible maps and dimensional properties of compactifications. Several results related to the class of quasi-finite complexes are established, such as completion of metrizable spaces, existence of universal spaces and a version of the factorization theorem. Furthermore, we define UV(L)-spaces in the realm of metrizable spaces and show that some properties of UV(n)-spaces and UV(n)-maps remain valid for UV(L)-spaces and UV(L)-maps, respectively.     

Photochemical Behavior and Photolysis of Protonated Forms of Levofloxacin

The effect of intermolecular proton transfer on the spectral properties of levofloxacin in the ground and excited electronic states was studied. The preferred direction of possible protolytic reactions induced by UV irradiation in this compound was studied. It was found that the proton transfer processes have a considerable effect on the capability of the compound to emit light and occur on the nanosecond timescale. The photochemical reactions of the tree forms of levofloxacin (pH: 4.0, 7.0, 10.0) were studied by laser flash photolysis and product studies. Irradiation at pH 4 yielded a pulse and transient (λ_max = 395, 515, 575 nm) assigned to the protonated triplet. Irradiation at pH 7 yielded a transient species (λ_max = 525, 610 nm) assigned to the neutral form. Protonation of the anionic singlet excited state was also observed (λ_max = 440, 570, 680 nm).     

Crystal structure of boron difluoride 3-phenylthiopentane-2,4-dionate. π stacking interactions and luminescence of boron difluoride acetyl acetonates

The crystal structure of boron difluoride 3-phenylthiopentane-2,4-dionate was determined. The relationship between the structure and luminescent properties is traced in the series of boron difluoride acetyl acetonates (acetyl acetonate, phenylacetyl acetonate, and phenylthioacetyl acetonate). The presence of the π stacking interactions in boron difluoride phenylthioacetyl acetonate crystals leads to increased intensity and bathochromic shift of the fluorescence band.     

Representation of the evolution operator via membrane amplitudes

Translated fromMatematicheskie Zametki, Vol. 60, No. 6, pp. 930–934, December, 1996.