Le monde la pratique

This paper presented to a meeting of W55 in Tampere by Ingmar Öfverholm of the University of Vienna deals with a new aspect of the old problem of conversion of future costs. The research is being incorporated into an extensive study on behalf of the Swedish Council for Building Research.     

Power Quality und technisches Risikomanagement

Ohne Zusammenfassung Kurzfassung eines Vortrags, gehalten anl?sslich der 39. Fachtagung der ?sterreichischen Gesellschaft für Energietechnik im ?VE, die am 18. und 19. Oktober 2001 in Salzburg stattfindet.     

Microstructure and Transport Properties of Bi-2212 Prepared by CO2 Laser Line Scanning

A novel Laser Line Scanning method has been applied to process rectangular cross-section Bi-2212 monoliths containing 2.9 % Ag using a CO₂ Laser. Although previous work has suggested the use of nIR lasers (≈0.8–1.1 μm) for melt-processing metal oxide superconductors, the results obtained here demonstrate that mid-IR radiation from a CO₂ laser (10.6 μm) may be just as convenient for such a purpose while it enables processing large surface areas. The samples described here were processed at traverse rates ranging between 15 and 60 mm/h, exhibited a complex textured microstructure and yielded highest I _c values of 71 A at 77 K.     

Ketimine substituted polyphenol: Synthesis,characterization and investigation of its thermal and electrochemical properties

Oxidative polycondensation of 3‐(1‐(2‐phenylhydrazono)ethyl)phenol (3‐PHEP) was studied using oxidants such as sodium hypochlorite, air (O₂) and hydrogen peroxide in an aqueous alkaline medium under various polymerization conditions. The polymerization yield, molecular weight, solubility, and thermostability of the polymer were investigated. The macromolecular structure of the resulting polymer was characterized by elemental analysis, ultraviolet–visible, Fourier transform infrared, and nuclear magnetic resonance techniques. Thermogravimetric analysis showed poly(3‐PHEP) to be highly stable against thermo‐oxidative decomposition. Mass loss of the polymer was found to be only 16.3% at 1000°C. In addition, the highest occupied molecular orbital–lowest unoccupied molecular orbital energy levels, electrochemical (E_g′) band gaps and optical (E_g) band gaps were calculated from cyclic voltammetry and ultraviolet–visible measurements, respectively. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013     

Glass covering of large building volumes

Results from Phase I of interdisciplinary research study led by Professor Ingemar Höglund with Göran Ottoson and Robert Öman from the Department of Building Technology, Stockhohn, show benefits outweigh negative aspects in covering 4000 square metres of pedestrian streets, revitalizing the Skärholmen Shopping Centre in south‐west Stockhohn in 1984. By incorporating district heating, double glazing and replacing brick with marble floor finishes, this had a positive effect on shoppers, staff and managers and increased sales. The heating consumption has remained the same.     

Optimization of α‐amylase production in solid substrate fermentation

Response surface methodology (RSM) was used to optimize the medium components of α‐amylase production using solid substrate fermentation (SSF). Hazelnut cake (HC), peptone, yeast extract (YE), and (NH₄)₂SO₄ were selected as independent variables for optimization. Central composite design (CCD) was used in design experiments and analysis results. This procedure limited the number of actual experiments performed while allowing possible interactions between the independent variables. By using CCD, 30 experiments were performed for determining the interaction of independent variables and optimization of fermentation medium. The P‐value of the coefficient of linear effect of (NH₄)₂SO₄ concentrations, which was obtained as 0.0001 has shown that this parameter has the greatest effect on the production of α‐amylase. Model F‐value (5.62) implies that the model is significant. The highest α‐amylase activity (4895 IU) was measured when the HC, peptone, YE, and (NH₄)₂SO₄ concentrations in the medium were 22.62, 5.20, 1.62, and 6.81 g L^?1, respectively.     

Determination of the Effective Properties of Thermal Spray Coatings Using 2D and 3D Models

Models, which are developed to determine the effective properties of thermal spray coatings, require the material properties of each constituent of the coating as well as the information about the spatial positions and the geometries of these constituents as input parameters. The complex microstructure of thermally sprayed Yttria-stabilized zirconia (YSZ) coatings consists of irregular voids which are distributed non-uniformly in the coating. It is a common practice in the literature to employ two-dimensional (2D) cross-sectional images of the coatings to derive the geometrical model of the microstructure and conduct the simulations in 2D. In the context of this study, contrary to the 2D approach, a new three-dimensional (3D) reconstruction approach has been developed to model the microstructure of thermally sprayed coatings in 3D. The effective properties of an YSZ coating have been calculated by means of asymptotic homogenization and virtual testing methods. The results of the models, which have been conducted in 2D and 3D, are compared with each other. Finally, the capabilities of these methods with respect to the modeling approach (in 3D and in 2D) are analyzed on the basis of reference measurements.     

EFFECT OF NITRIC ACID EXTRACTION ON PHASE BEHAVIOR,MICROSTRUCTURE AND INTERACTIONS BETWEEN PRIMARY AGGREGATES IN THE SYSTEM DIMETHYLDIBUTYLTETRADECYLMALONAMIDE (DMDBTDMA) / n-DODECANE / WATER: A PHASE ANALYSIS AND SMALL ANGLE X-RAY SCATTERING (SAXS) CHARACTERISATION STUDY

ABSTRACT

Among the different problems to be solved when designing a liquid-liquid solvent extraction process, third phase formation. i.e. the splitting of the organic phase into two layers when extracting high concentration of solutes, like nitric acid or metallic nitrates (here trivalent f ions), is one of the most important to address. In some conditions the formation of a “third phase” is observed with dimethyldibutyltetradecylmalonamide (DMDBTDMA), a potential extractant used in the DIAMEX process

We have investigated the phase behavior of the system DMDBTDMA / n-dodecane / water / HNO₃, in the acceptable concentration limits for the DIAMEX process.