Materials Literature
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The effects of low-temperature stress on the glycolytic activity of the lactic acid bacterium Lactococcus lactis were studied. The maximal glycolytic activity measured at 30 degrees C increased approximately 2.5-fold following a shift from 30 to 10 degrees C for 4 h in a process that required protein synthesis. Analys…
A petromimetic (geological–analog) approach is applied to the design of alumina‐fiber‐reinforced glass‐ceramic‐matrix composites that use a refractory, trioctahedral fluoromica fiber–matrix interphase and feldspar matrixes. Studies of the solid‐state reaction couples between these silicate phases are pursued to addres…
The structural properties of As–Se–S glass system were investigated by x-ray absorption spectroscopy (XANES and EXAFS) using synchrotron radiation. A preliminary characterization by x-ray powder diffraction, differential scanning calorimetric and thermogravimetric measurements was also carried out. The changes in glas…
A new orthorhombic polar variety of Pb-hilgardite containing Na + and HOCl 2− ions in the cavities of the framework has been prepared by hydrothermal synthesis. A correlation between the structural features and nonlinear-optical properties of the crystals is discussed. Similar to the hexaborate group, pentaborates wit…
This paper proposes a new Measurement Standardization Procedure to measure and quantify the acoustic noise produced by power transformers in audio and video equipment under normal and adverse mains conditions. These conditions and the physical mechanisms that cause the noise are discussed. A new measurement set up and…
Relaxor-like dielectric behavior, analogous to that found in lead magnesium niobate, has been induced in the polar dielectric barium magnesium niobate (BMN). In BMN, the dielectric constant was increased and the temperature of the maximum dielectric constant was shifted to a lower temperature with a decrease in measur…
Chromium-doped zinc oxide thin films were deposited using the spray pyrolysis technique. In all cases 15 at. % of chromium in solution was used. Under diluted HCl, a low etching rate in ZnO:Cr thin films is obtained, as compared to undoped ZnO. As-deposited and vacuum-annealed films show a high resistivity. X-ray diff…
High-temperature polyimide composites with low and stable dielectric properties were produced by thermally curing prepolyimide moulding compounds which were prepared by the wet impregnation of chopped short quartz fibres with a PMR-II polyimide matrix resin solution, followed by the evaporation of the solvent with vig…
A solution of the eddy currents problem in a solid conducting cylinder placed in the field of an eccentric circular current loop is presented. The conventional potential theory can only deal with the simple case of rotational symmetry and axially directed exciting wires. If, however, the exciting current loop is place…
Minor amounts of clay minerals precipitated from aqueous solution can be rapidly identified and quantified in a mineral mixture with powder X-ray diffraction using a rotating-anode source and a position-sensitive detector. For the case of gibbsite precipitated on a kaolinite powder substrate we demonstrate a simple me…
Effects of the hot pressing parameters on the designing of structures and properties of hydroxyapatite/poly-L-lactide (HAp/PLLA) biocomposite blocks have been studied. Interdependences of temperature, pressure and time of hot pressing and the density, compressive strength, elasticity modulus were defined. Microstructu…
Abstract The decomposition of HCN over H-ferrierite below 670 K proceeded mainly by hydrolysis to NH3 and CO. In the presence of NO and NO2, NH3 formed further reacted to form N2 and N2O.
We have found that ZnO films consisting of epitaxially ordered arrays of closely packed hexagonal microcrystallites grown on vicinal (1000) sapphire exhibit biaxial in-plane optical anisotropy. The optical anisotropy resonance occurs near the band gap energy of ZnO. The line shape of the resonance is consistent with t…
Solid-state 13C NMR was utilized in analysis of the crosslink structure in silica-filled polyisoprene. Samples containing either a pre-coated coupling agent, a coupling agent added in the mixing process, or polyethylene glycol (PEG) were vulcanized and the type and density of crosslinking determined. The precoated cou…
An analytical 2-dimensional model taking account of the anisotropy of crystal growth is proposed to describe dendrite growth during directional solidification. Within a unit cell, a shape function of the dendrite is defined. This depends on the solidification condition, the local fraction solid and crystallographic or…
The morphology and size of Fe–Co rich particles in Alnico 8 specimens thermomagnetically treated at 800°C for various times have been investigated by means of transmission electron microscope (TEM) observations and small angle X-ray scattering (SAXS). Phases rich in Fe–Co and Ni–Al were formed during spinodal decompos…
Les effets d'un chauffage thermique continu sur les performances en terme de reflectivite de miroirs multicouches Mo/Si, Mo/C, Ni/C sont etudies. Les mesures de reflectivite autour de 100eV sont realisees en utilisant le rayonnement synchrotron de Super-ACO au LURE. Des variations de reflectivite en fonction de la tem…
The crystal structures of the new gallosilicate hydrosodalites Na 5 [Ga 0.8 Si 1.2O4 ] 6 (H 2 O) 8 was refined from X-ray powder data in the bodycentred space group I-43m: a = 884.15 pm, V = 0.6912 nm 3 , Z = 2, R WP = 0.063, R P = 0.048, R I = 0.014 for 6000 data points and 12 variable positional parameters. The stat…
Eight-year atmospheric corrosion tests of A 588B (UNS K12040) weathering steel were conducted in industrial, marine, and rural environments. The material was tested following two types of heat treatment: quenched-and-tempered to produce a tempered martensite microstructure and normalized to produce a microstructure co…
Bench-scale and full-scale investigations of waste stabilization and volume reduction were conducted using spiked soil and ash wastes containing heavy metals such as Cd, Cr, Pb, Ni, and Hg. The waste streams were stabilized and solidified using chemically bonded phosphate ceramic (CBPC) binder, and then compacted by e…