Recovery of Gold from Cyanide Solutions Using Activated Carbon Sorbent Based on Lignite

Recovery of gold cyanide complexes was studied using sorbents prepared from Kansk-Achinsk lignite.     

Stochastic resonance to control diffusive motion in chemistry

This paper reports on a novel procedure to tune the effective diffusion coefficient of a field-sensitive reactant in the presence of a periodic external field. We investigate the motion of two negatively charged azo dyes interacting with alpha-cyclodextrin (alpha-CD) upon action of a periodic square wave electrical field. We show that the dyes exhibit an effective diffusion coefficient D(eff) that depends on the rate constants for dye complexation within alpha-CD, the period and the amplitude of the field. UV-vis absorption, gradient field (1)H NMR, and fluorescence correlation spectroscopy (FCS) after two photon excitation are used to evidence that D(eff) may be increased far beyond its intrinsic value when specific relations interpreted as a stochastic resonance are fulfilled. The present results may find useful applications in chemical kinetics as well as for molecular sorting.     

Evidence of suprathermal electron fluxes in laser-produced plasma from the polarization and anisotropy of X-ray bremsstrahlung emission

Polarization and angular distribution of suprathermal X-ray emission from plasma produced by picosecond ruby laser pulses have been measured. Polarization of 12 ± 3 percent and anisotropy of X-ray angular distribution evidence the existence of suprathermal electron fluxes in plasma. Their direction corresponds to resonance absorption mechanism.     

Angular distribution of electrons after passage through thick samples

The angular distribution of electrons having an initial energy of 6.74 MeV has been studied after passage through C, Al, Cu, Sn, and Pb samples having thicknesses in the range in which multiple-scattering theory does not apply.Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, Vol. 12, No. 7, pp. 51–54, July, 1969.