Extraction of U(VI) from Perchlorate Solutions with Diantipyrylmethane Derivatives

Extraction of U(VI) from perchlorate solutions with diantipyrylmethane derivatives in chloroform and dichloroethane is studied. The composition of extractable complexes is [UO₂L₂](ClO₄)₂. The extraction constants are estimated. The maximal extractive power is shown by diantipyrylmethane in dichloroethane. Introduction of substituents at the methylene carbon of the extractant molecule makes the extraction worse.     

Extraction of U(VI) with antipyrine in the presence of aminone pyrazolone dye

Extraction of U(VI) with a solution of antipyrine in chloroform in the presence of aminone [a pyrazolone dye, di(p-dimethylaminophenyl)(1-p-sulfophenyl-3-methylpyrazol-5-on-4-yl)carbinol ammonium salt] was studied. A procedure was suggested for extraction-chromatographic determination of 2–30 μg of U(VI). The extractable complex has the composition UO₂L₂A₂; ?₄₇₀ = 4.5 × 10⁴. Th, Sc, In, Fe(III), REE, Zr, Mo(VI), and some other elements in a 500-fold molar excess do not interfere with the determination.     

Cold electron bolometers: High-precision sensors of extremely weak signals in terahertz wave band

Several approaches to the problems of design, performance characteristics analysis and application of receiving systems operating in terahertz and submillimetric wave bands are considered. Possible structures of such detectors are described. Some advantages of cold electron bolometers are identified. A series of measurements for detector characteristics are carried out; in addition, the equipment required for such experiments is discussed.     

Electronic Safety Control Unit as an Element for Protecting Turbosets

Problems of safe operation of turbosets under current condition of heat power engineering are discussed. Data showing the necessity for using computer technologies for ensuring reliability of operation of turbosets and increasing their service life are presented. General characteristics of an electronic safety unit for protecting turbosets from overspeed, which makes it possible to test protection system without changing the rotational speed of the turboset, are presented. The use of such overspeed control systems increases the service life of turbosets. __________ Translated from Elektricheskie Stantsii, No. 5, May 2005, pp. 40 – 47.