The process of recovering solvent vapors in successive layers of granular or fibrous carbon adsorbence

Conclusions -- Results have been given of a study of the process of recovery of acetone and toluene vapor by a fibrous-granular carbon tower consisting of activated carbon fibre of the Aktilen^R type and granular activated carbon.-- It has been found that such a tower permits one to increase the degree of utilization of the adsorptive capacity of the adsorbents with respect to the less well sorbed component (acetone) in the investigated mixture of organic solvents, and to increase the duration of protective action. This facilitates processes of separating the recovered mixture of volatile solvents.Translated from Khimicheskie Volokna, No. 4, pp. 40–42, July–August, 1990.     

The characteristics of the technical instrumental support for the osteosynthesis of femoral neck fractures using the Seppo fixator

Operative treatment of fractures of the femur neck is the method of choice. The authors prefer the A. Seppo construction out of great number of fixtures but it is difficult to introduce and remove this fixture due to its complexity. To make the procedure of such interventions easier the authors propose a marking device, a screwdriver and a device allowing the fixture's curvature to be regulated. The modification of the technique and using a specially developed extractor is explained by difficulties in removing the fixture by common methods. The variant of the improved instrumental tooling proposed by the authors makes the operation more handy and practicable.     

Application of complexing reagents to flotation separation of the varieties of pyrite

It is considered how the organic reagents, complexing agents, change floatability of the varieties of pyrite with different content of goal. The authors continue studying the flotation effect of the reagent PROX capable to selectively decrease floatability of some pyrite varieties in the presence of xanthogenate due to formation of a hydrophilic complex compound with ferric iron at the phase interface of the mineral surface — liquid, and to reduce sorption of xanthogenate. A phytogenous reagent is suggested as an alternative to the multi-component PROX. The new reagent mechanism is described by examining the chromatographic behavior of the compound of this reagent and ferric iron salt. __________ Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 4, pp. 111–120, July–August, 2007.     

Iron-cementite nanocomposites obtained by mechanical alloying and subsequent magnetic pulsed pressing

X-ray diffraction, atomic-force microscopy, and density, microhardness, and coercive force measurements were used to study bulk iron-cementite nanocomposites obtained by different regimes of magnetic pulsed pressing of mechanically alloyed samples with a total carbon content ranging from 5 to 25 at. %.     

Monoclonal antibodies to the alpha-subunit of the putative human H+,K+-ATPase encoded by the atp1al1 gene

The N-terminal fragment of ATP1AL1, the possible catalytic subunit of human ouabain-sensitive H+,K(+)-ATPase, was expressed in Escherichia coli cells as two recombinant proteins: the Ser14-Ile104 fragment or the same fragment containing His6 sequence at its N-end. The second protein was purified by metal-affinity chromatography and used as an antigen to construct two hybridoma lines producing antibodies of the IgM class. These monoclonal antibodies were shown to recognize not only the starting antigen but also the full-size recombinant ATP1AL1 protein and do not react with Na+,K(+)-ATPase.     

Glass formation range in the SeO2-TeO2-V2O5-MoO3 system

The glass forming region in the quaternary system under increased oxygen pressure and at a slow melt cooling rate (2 to 2.5° C min^-1) has been determined. The stable glasses are located in the central part of the system but nearer to the SeO₂-TeO₂ side. The structural units of these two glass formers are of decisive importance in building up the glass lattice. Infrared spectra of selected compositions from the glass forming region are taken. From the data obtained for the binary glasses in the TeO₂-V₂O₅, TeO₂-SeO₂, TeO₂-MoO₃, V₂O₅-MoO₃ systems and the spectra of the four component compositions, it is shown that the basic structural units participating in the glass lattice formation are the SeO₃, VO₅, TeO₄ and TeO₃ groups. Structural models are proposed: glasses in the SeO₂ direction possess laminar and chain structure, while with increase of TeO₂ concentration, a three-dimensional structure is built up.     

Non-destructive ultrasonic investigation of the structure state of steam pipelines

The main purpose of the work is to study the dependence of the ultrasonic wave parameters on the structure state in tubes of boilers at thermo-electric power station. The changes of the velocity, spectra and attenuation of ultrasonic surface waves are caused by degradation of the structure and can be used for residual life estimation of the equipment.     

Optical properties of chemical vapor deposited thin films of molybdenum and tungsten based metal oxides

Thin films of tungsten oxide, molybdenum oxide and mixed MoO₃–WO₃ oxides were obtained by atmospheric pressure chemical vapor deposition (CVD). All the films were prepared using identical technological parameters and through investigation of the optical properties of as deposited and annealed at 400°C a comparative study is reported. Raman, IR and VIS spectrophotometry and spectral ellipsometry methods were used. The mixed MoO₃–WO₃ films have higher optical absorption with maxima at a closer position with respect to the human eye sensitivity peak at 2.5 eV. The observed electrochromic effect is better expressed in the mixed films; the electrical charge inserted is higher.     

Low cost surface passivation for p-type mc-Si based on pseudobinary alloys (Al2O3)x(TiO2)1−x

The conventional process for back side passivation with full face Al screen printing layer is not suitable for very thin multicrystalline (mc-Si) solar cells and approaches to new technological processes are searched for. More investigations have been concentrated on local aluminum contacts and passivation coatings with different layers on mc-Si wafers. The aim of this work is to prove that (Al₂O₃)_x(TiO₂)_1−x is one promising candidate to be applied as passivation layer on multicrystalline Si. Investigations were performed on dielectric films of pseudobinary alloy (PBA) (Al₂O₃)_x(TiO₂)_1−x, prepared by chemical solution deposition known initially as sol–gel method. It was determined that their optical, dielectric and electrophysical properties are suitable for applications of these layers as back side surface passivation for thin multicrystalline silicon cells.