Materials Literature
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The AC electric breakdown field strength F/sub B/ of aromatic polymer films as a function of sample thickness was investigated. A power-law dependence of F/sub B/ on sample thickness was found. The exponential parameter of the power law was shown to correlate with the electron accepting properties of the polymer. Reas…
An optoelectronic system for detecting partial discharges in a sheltered HV device is described. The system consists of a fluorescent plastic optical fiber, with photomultipliers or photodiodes measuring the light intensity at the end of the fiber. The result depends on various factors that might influence the optical…
We study diffusion in a dilute system of Brownian particles with hydrodynamic interaction and hard core repulsion. We assume that the hard core has a radius larger than the hydrodynamic one. The short-time and long-time self-diffusion coefficient, as well as the collective diffusion coefficient, are calculated exactly…
Magnetization measurements are presented for the ${\mathrm{Fe}}_{3\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Ti}}_{\mathit{x}}$${\mathrm{O}}_{4}$ series in the range 0\ensuremath{\le}x1. A new model of ${\mathrm{Fe}}^{3+\mathrm{\ensuremath{-}}}$${\mathrm{Fe}}^{2+}$ cation distribution is proposed based on saturation…
Gasification of metallurgical coke was studied at 1 000, 1 200 and 1 400°C with Ar-CO-CO2 mixtures. Reaction of coke in blast furnace is dominant from 1 000°C. And at the same time, growth of graphite crystal in coke begins around the temperature.In present paper, two types of carbon structure were classified by means…
Using hard and soft acid-base theory to understand corrosion.
Transmission line properties of typical high-speed interconnects were experimentally investigated by fabricating and characterizing coplanar strips on semi-insulating GaAs substrates. The strips have thicknesses of about 2500 AA or 5000 AA and widths of 4, 6, or 8 mu m so as to be representative of on-chip interconnec…
Cobalt(II)–tetraphenylporphyrin (CoIItpp)-fixed glassy carbon (GC) electrodes were prepared using 4-aminopyridine (pyNH2) in the form of CoIItpp–pyNH–CO/GC, which were active for electroreduction of CO2 to CO at potentials 100 mV more positive than water-soluble CoII porphyrins, and the overall turnover number of CoII…
A DNA target model has been developed, based on the geometrical co-ordinates of individual atoms. This model is used to analyse DNA damage produced by Auger electron tracks from the decay of 125I. The high resolution of this target model enables the distinction between direct and indirect electron hits, i.e. hits insi…
The numerical methods which have been proposed by the present authors for Lamb waves in an anisotropic laminated plate and its transient responses are expanded for the wave propagation analysis of functionally gradient material (FGM) plates. The material properties of the plate change gradually in the thickness direct…
On etudie les zones de formation vitreuse et differentes proprietes de verres du systeme: Al 2 O 3 −SiO 2 −R 2 O x (ou R 2 O x =Nd 2 O 3 , Sm 2 O 3 , Tb 4 O 7 , Er 2 O 3 , Y 2 O 3 )
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNitrite-bound five-coordinate low-spin iron(II) model complex for the prosthetic group of nitrite reductase with an unusually large quadrupole splitting. Synthesis, Moessbauer properties, and molecular structure of the complex (nitro)(.alpha.,.alpha.,.alpha.,.alpha.-tetrakis…
The biodegradable polyesters, poly(hydroxybutyrate) (PHB) and poly(hydroxybutyrate-hydroxyvalerate) (PHBV) were investigated for use as sustained delivery carriers of a model drug, progesterone. Spherical microspheres containing the drug were prepared by an emulsion solvent-evaporation method with gelatin as an emulsi…
Abstract Quantitative electron probe microanalysis of nitrogen has been performed on 18 nitride specimens in the voltage range of 4–30 kV. A conventional lead stearate and a new W/Si multilayer analyzer crystal (2d = 5.98 nm) were used simultaneously. The net peak count rates on the latter crystal were approximately 2…
The dark-brown compound [N(Me)4]4[AsIII8VIV14O42(0.5H2O)] containing a spherical anion [AsIII8VIV14O42(0.5H2O)]4– containing condensed VO5 square pyramids and As 2O5 units, is synthesized hydrothermally from As2O3, V2O5 and (Me)4NOH and structurally characterized by X-ray diffraction.
Conditions for carbothermal synthesis of α‐Si 3 N 4 are presented with special emphasis on the reaction temperature, C:SiO 2 ratio, and precursor mixing. With pure precursors, the conversion temperature is 1500° to 1550°C. An excess of C is necessary for complete conversion, and a simple sol–gelmixing technique provid…
The compound [Me3N(CH2)6NMe3]2[Mo8O26]·2H2O crystallizes from an aqueous solution of sodium molybdate and [Me3N(CH2)6NMe3]Cl2, slightly acidified with hydrochloric acid. The crystals are monoclinic, space group P21/n with a= 12.42(1), b= 12.897(3), c= 15.74(1)Å, β= 106.41(5)° and Z= 2. The structure was determined by…
High-resolution 27Al magic-angle spinning nuclear magnetic resonance spectroscopy (MAS NMR)(78.15 MHz) spectra are reported for commercial and natural gibbsites and materials occurring in the thermal transformation sequences of gibbsite (boehmite; χ, α and ρ-aluminas; calcines produced at 400, 700, 900 and 1000 °C). S…
Abstract Amorphous celluloses were prepared by regeneration of cellulose from its solutions in the SO 2 –diethylamine–dimethylsulfoxide (SO 2 –DEA–DMSO) solvent system, and other selected SO 2 –amine–organic solvents. The celluloses were amorphous whether regenerated in water or in alcohols or other organic solvents;…
Fors soil (Tierp) is classified as an illitic, calcareous, frigid Udic Haploboroll according to the Soil Taxonomy and as a Calcaric Phaeozem in the FAO-system. It is a silty soil consisting of a thick dark brown coloured A-horizon and a subsoil rich in calcium carbonate and bases. Kungsängen soil (Uppsala) is classifi…