Multisalt-carbon chemical cooler for space applications

Conclusions  The conclusions are summarized as follows:

A new method of preparing and some properties of high molecular weight monoamine oxidase from swine liver mitochondria

Isolation of highly purified and highly molecular monoamine oxidase (MAO) from pig liver mitochondria have been worked out. Specific activity of isolated preparation is 2700 times higher than of original mitochondria homogenate. Enzyme solubilization by digitonin, affinity chromatography purification and ultrafiltration underlie this method. MAO catalytic properties changing during the process of purification by different methods have been investigated. Substrate specificity was studied; kinetic parameters of enzymatic desemination were calculated.     

Synthesis and properties of Np(VI) and Pu(VI) monophthalates

Neptunium(VI) and plutonium(VI) monophthalates were prepared and characterized. The complexes AnO₂ (COO)₂C₆H₄ 2H₂O were isolated from cold solutions, and AnO₂ (COO)₂C₆H₄ 1.33H₂O, from hot solutions. NpO₂ (COO)₂C₆H₄ b. 2H₂O and PuO₂ (COO)₂C₆H₄ 2H₂O crystalize in the triclinic and monoclinic systems, respectively. The complexes AnO₂(COO)₂C₆H₄ 1.33H₂O are isostructural and crystallize in the rhombohedral system. The thermal behavior of these complexes was studied. Their IR and electronic absorption spectra were recorded. The properties of these complexes were compared to those of known U(VI) monophthalates.Translated from Radiokhimiya, Vol. 46, No. 5, 2004, pp. 389–395.Original Russian Text Copyright © 2004 by Krot, Bessonov, Grigorev, Charushnikova, Makarenkov.     

Synthesis of robust discrete systems based on comparison with stochastic model

The problem of synthesis of the stabilizing control for a discrete linear system with uncertain parameters is considered. The stochastic model of comparison with parametric noise is constructed; the mean-square stability of this model implies the stability of the system with uncertain parameters varying in a given domain. For the case of the state feedback, the methods of synthesis of the robust stabilizing control based on the solution of either linear matrix inequalities or an auxiliary optimization problem with constraints in the form of linear matrix inequalities are proposed. The converging iterative algorithm of synthesis of the robust stabilizing control for the case of the output feedback is proposed. An example is given.     

Effect of the heat treatment and plastic deformation of high-strength corrosion-resistant nitrogen-bearing steels on their wear resistance during sliding friction

Wear-resistance sliding-friction tests of high-strength corrosion-resistant nitrogen-bearing 08Kh14AN4MDB and 05Kh22AG15N8M2F steels have been performed for different structural states under sliding-friction conditions. The wear resistance of these steels depends on the intensity of the strain hardening of austenite. The martensitic-austenitic 08Kh14AN4MDB steel has a higher wear resistance if it has a high nitrogen-austenite concentration. The dependence of the weight loss of the 05Kh22AG15N8M2F and 12Kh18N10T steels on the test time is found to be linear.     

Green lasers based on CdSe/ZnSe nanostructures pumped by electron beams with energies below 10 keV

We have studied the output characteristics of pulsed electron-beam-pumped green lasers based on ZnSe-containing quantum-sized structures with thin (20 nm thick) external ZnMgSSe confinement layers. Room-temperature lasing has been observed for electron beam energies above 3.7 keV. At a beam energy of 8–9 keV, the minimum threshold beam current density was 0.4–0.5 A/cm². The maximum laser output pulse energy was 2 W at a pumping electron beam energy of ～5 kW.     

A reference model for a flowmeter magnetic field for a computing experiment

A reference model is considered for a magnetic field intended for checking programs and algorithms defining the electromagnetic field in an electromagnetic flowmeter measurement channel. __________ Translated from Izmeritel’naya Tekhnika, No. 4, pp. 39–41, April, 2007.     

Experimental investigation of electron guns for THz microwave vacuum amplifiers

Single-sheet and multiple beam electron emitters based on thermionic minicathodes for terahertz traveling-wave tubes have been studied. Data are presented for impregnated blade thermionic cathode with dimensions 0.1 × 0.7 mm and a maximum current density of 114 A/cm² in a pulsed mode. A variant of the five-beam electron gun with 0.25-mm-diameter cylindrical minicathodes in cells of a control grid is proposed that provides a current density of 85.5 A/cm² at a grid potential of 900–1000 V.

     

Determination of topological parameters of a laser with passive mode-locking on the basis of InGaAlAs/InGaAs/InP heterostructures

Topological parameters of a strip-geometry laser with passive mode-locking on the basis of an InGaAlAs/InGaAs/InP heterostructure are determined from the condition for the existence of one transverse mode in a strip waveguide. The strip width was 1.5 μm, the mesa etch depth was 1.32 μm, and the thickness of the dielectric layer was 0.36 μm.