Physico-chemical synthesis of diamond in metastable range

The present paper discusses the synthesis of diamond in its metastable region from carbonaceous gases, in particular methane. The diamond synthesis on seed crystals is made possible owing to the orientation effect of surface forces on the formation of a new phase. Discussed is also the joint crystallization of diamond and graphite. The basic experiments were made on highly dispersed diamond powders. The growth of diamond in kinetic and diffusion regions has been studied. Presented are results of studying the fractionation of stable carbon isotopes when growing a diamond.     

Application of the hydrodynamic analogy to the flow in a supersonic nozzle

We examine the flow of a supersonic stream in an annular duct. In approximation of the hydrodynamic analogy we have given consideration to both friction and heat transfer. A general equation is presented, as are the solutions for several special cases.     

Syphon devices for dispensing and measuring liquid flows

Conclusions Devices which use a container with a syphon have a simple primary transducer and a high precision inherent to counting flowmeters. Their deficiencies include the necessity of breaking the pipeline in order to expose the container to the atmosphere.Translated from Izmeritel'naya Tekhnika, No. 10, pp. 91–92, October, 1967.     

Synthesis and Spectral Study of New Complexes of Eu3+, Am3+, and Cm3+ with GaMo6O18(OH)

Complexing of Am(III) with GaMo₆O₁₈(OH) ₆ ³⁻ polyanion in an aqueous solution was studied. The stability constant β of the resulting complex was estimated at 100–150 l mol⁻¹ at pH 4.0. Crystalline complexes of Eu(III) and Gd(III) [doped with 0.5–1.5% Cm(III) ion] with GaMo₆O₁₈(OH) ₆ ³⁻ polyanion were synthesized from H₂O and D₂O solutions. The luminescence spectra and lifetime were measured for the compounds at T = 295 and 77 K. The luminescence characteristics of the Eu(III) complex proved to be virtually identical to those of the previously synthesized compound EuAlMo₆O₁₈(OH)₆·xH₂O. This also concerns the luminescence of Cm³⁺-doped GdGaMo₆O₁₈(OH)₆·xH₂O complex. The results suggest identical structures of the new compounds and complexes of lanthanides with the AlMo₆O₁₈(OH) ₆ ³⁻ anion. __________ Translated from Radiokhimiya, Vol. 47, No. 6, 2005, pp. 507–511. Original Russian Text Copyright ? 2005 by Yusov, Fedoseev.