The mutual influence of imino acids and phenylalanine on the dynamic characteristics of sorption on KU-2 × 8 sulfocation exchanger in the H form

The dynamics of sorption of pure imino acids (proline and hydroxyproline) and imino acids in the presence of aromatic amino acid, phenylalanine, on KU-2 × 8 sulfocation exchanger in the H form was studied. Mutual influence of amino acids on the dynamic characteristics of sorption was observed. This influence changed the shape of elution curves and decreased the working exchange capacity. Both competitive and synergistic sorption mechanisms governed sorption of amino acids from binary solutions.     

Diffractive elements based on spiral beams as devices for determining the depth of bedding of radiation sources

A modified iteration method is proposed for calculations in developing diffraction optical elements for the generation of rotating light fields. The main feature of the proposed approach is the use of the spiral light beam theory for selecting the initial phase approximation. The diffractive optical elements under study could be used in microscopic analysis of the spatial location of different objects.     

The thermodynamic characteristics of formation of alloys in the Ge-Ga-Mn and Si-Ni-Al systems

The enthalpies of mixing of ternary system melts were determined by high-temperature calorimetry under isoperibolic conditions. For the Ge-Ga-Mn system, measurements were taken at 1780 ± 5 K along five ray sections with constant ratios between the atomic fractions of germanium and gallium up to a ～0.6 mole fraction of manganese; the x _Ge/x _Ga ratios were 0.8/0.2, 0.7/0.3, 0.5/0.5, 0.3/0.7, and 0.15/0.85. For the Si-Ni-Al system, measurements were taken at 1770 ± 5 K along five ray sections with constant ratios between the atomic fractions of silicon and nickel up to a ～0.6 mole fraction of aluminum; the x _Si/x _Ni fratios were 0.85/0.15, 0.7/0.3, 0.5/0.5, 0.3/0.7, and 0.15/0.85. The formation of melts in these systems was found to be exothermic over the composition range studied. The integral enthalpies of melt formation were maximum along the x _Ge/x _Ga = 0.8/0.2 section in the Ge-Ga-Mn system (?18.8 ± 3.3 kJ/mol) and along the x _Si/x _Ni = 0.5/0.5 section in the Si-Ni-Al system (?67.8 ± 3.4 kJ/mol). An analysis of the isolines of the integral enthalpies of mixing led us to conclude that the Ge-Mn and Ga-Mn binary systems had the strongest influence on the thermodynamic characteristics of melt formation in the Ge-Ga-Mn system, the predominant influence being that of the Ge-Mn binary system. An analysis of the energy characteristics of melt formation in the Si-Ni-Al ternary system showed that the major contribution was made by the interaction of components in the Si-Ni and Ni-Al boundary binary systems, the influence of the Si-Ni system being stronger.     

Ecological monitoring of megapolis on the basis of differential backscattering control of the wood culture

The application of the differential backscattering method and the fluorescent analysis of wood cultures for the determination of ecological quality of different megapolis areas are investigated. The correlation of leaves optical characteristics with the data of the chemical analysis of leaves pigments concentration is shown on the basis of the year statistical results of wood cultures spectral characteristics observation. It is experimentally found that the method of differential backscattering allows to identify megapolis areas on their ecological level.     

Nonreciprocal Optical and Magnetooptical Effects in Semiconductor Quantum Wells

Physics of the Solid State - Abstract—Effects implying violation of the Fresnel light reflection laws in semiconductor structures with quantum wells (QWs) have been investigated. This...     

The equilibrium characteristics of pyridoxine hydrochloride sorption on clinoptilolite

Pyridoxine hydrochloride (vitamin B₆) sorption by clinoptilolite from aqueous solutions has been studied at 283, 295, and 317 K. Enhancement of the sorption with decreasing temperature has been found. Isotherm of pyridoxine hydrochloride adsorption from dilute solutions may be described by the Langmuir theory. It has been shown that the monolayer coverage of clinoptilolite surface with pyridoxine occurs via the equivalent exchange with extra-framework cations of the sorbent. Thermodynamic parameters of vitamin monolayer adsorption have been determined. It has been concluded that the polymolecular adsorption is due to the formation of pyridoxine associates in the sorbent mesopores.     

Dynamics of the Stokes pulse in a Brillouin amplifier

We show that the output Stoke pulse from a continuously (CW) pumped stimulated Brillouin scattering (SBS) amplifier is the sum of the transmitted input Stokes pulse, which propagates undistorted through the medium without amplification and additional delay, and of a Stokes shifted pump signal reflected by the electrostrictively induced acoustic wave, which contributes to the Stokes output signal with a delay determined by the time required for build up of the acoustic wave.     

Representation of the sound field of a turbulent vortex ring as a superposition of quadrupoles

Results of an experimental study of the directivity of noise produced by a turbulent vortex ring (Re≈10⁵) are presented. The acoustic measurements were performed in an anechoic chamber by a circular array of microphones with its center lying at the symmetry axis of the ring. A method of a synchronous processing of acoustic signals is proposed. This method allows one to separate different quadrupole components in the measured sound field of a turbulent vortex.     

Electrochemical Properties of Electrode Materials Based on Pr5Mo3O16 + δ

Russian Journal of Electrochemistry - The electrochemical activity of electrode materials based on Pr5Mo3O16 + δ (РМО), and applied on the surface of Ce0.9Gd0.1O1.95 (GDC)...