Investigation of adsorption purification of the effluences containing heavy metal ions

Kinetics of adsorption purification of effluences containing heavy metal ions and adsorption of the metal ions under dynamic conditions using various adsorbents, including the products from industrial wastes are studied.     

Using synchrotron radiation X-ray fluorescence analysis in a chemotaxonomic study of some Siberian species of the genus Pentaphylloides hill

The elemental composition of four species of the genus Pentaphylloides Hill is determined by means of synchrotron radiation X-ray fluorescence analysis (SRXRF). Each of the studied species is characterized by specific concentrations of elements that are typical of it and can be used in a comparative analysis of other species and be included in a corresponding database. In the case of P. fruticosa and P. x mandshurica, a high content of microelements is observed in all organs that distinguishes them from other species.     

Size effects of static conduction in thin tantalum films

In thin tantalum films grown by pulsed laser deposition in a vacuum, the resistivity versus thickness dependence is found to oscillate. The oscillation periods equal 5.0 and 5.6 nm for α-and β-Ta films, respectively. This observation is interpreted as the quantum-size effect in thin tantalum films.     

Energy distribution of ions in plasma formed by laser ablation of metallic Nb and Ta targets

The laser plasma plume expansion induced by UV nanosecond irradiation from metallic Nb and Ta targets has been studied using Langmuir probe time-of-flight measurements. The ion current shape was measured as a function of the laser radiation flux at various probe-to-target distances. The ion velocity distribution and the ion energy spectra have been determined by measuring the time of flight of ions reaching the Langmuir probe. A multi-mode velocity distribution of ions has been revealed. The dependence of the amplitudes of the plume energy components on the plume scatter time and on the laser radiation flux has been investigated. The experimental time-of-flight data have been compared with a Maxwell velocity distribution. The threshold values of the laser intensity were determined for different distribution modes in the ion energy spectrum.     

Vanadium- and Titanium Dioxide-Based Memristors Fabricated via Pulsed Laser Deposition

Thin TiO _x and VO_{2 – x} films are fabricated via pulsed laser deposition from metal targets with the help of mask technologies. Their memristive properties are investigated using Au/TiO_x1/TiO_x2/Au and Au/VO₂/VO_{2 – x}/Au thin-film structures, and the possible mechanisms of resistive switching are discussed. The structures are obtained at room temperature in an oxygen atmosphere.     

Stability of the synchronous state of an arbitrary network of coupled elements

We propose a method for determining the range of the coupling parameter for which the network of slightly nonidentical chaotic oscillators demonstrates stable synchronous behavior. As an example of using this method, we study the complete-synchronization regime of a network of nonidentical Rossler oscillators. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 49, No. 10, pp. 917–924, October 2006.