Materials Literature
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A universal analytic formula is given for the total cross sections of single-electron capture by multiply-charged ions colliding with H, H 2 or He. Values of constants in the formula have been determined by least-squares fit to experimental data collected from the literature. The formula is applicable to ions of almos…
Deuterium NMR studies have been performed in LiCl\ensuremath{\cdot}R(${\mathrm{D}}_{2}$O) (mole fraction R=4 and 7, respectively) over the temperature range of 15 to 170 K, i.e., below and above the glass transition temperature (${T}_{g}$\ensuremath{\simeq}145 K). The motional mechanism of the four ${\mathrm{D}}_{2}$O…
Two-electron and four-electron reduction of dioxygen by an acid-stable NADH model compound, 10-methylacridan, occurs efficiently when catalysed by metalloporphyrins and by both metalloporphyrins and iodide ion in the presence of perchloric acid in acetonitrile, respectively.
The cubic system of the space group denoted by Oh5–Fm3m with the lattice constant of a=0.5833±0.0003 nm has been found more feasible for the crystal structure of superionic phase of Cu2Se (α-Cu2Se) at 473 K using the usual powder X-ray diffraction method. The present conclusion has also been supported by the anomalous…
Microstructural and property assessments have been undertaken on spray deposited M2 high speed steel in the as deposited condition and after hot forging. The response of the material to hardening treatment has also been studied. The microstructure of the as deposited material showed a small grain size with a cellular…
At current densities large in magnitude and also large compared to the exchange current density, a conducting disk in an insulating plane has a very nonuniform current distribution across the surface. The current distribution near the center is governed predominantly by ohmic effects, but near the edge, electrode kine…
Abstract
In recent years, several investigations have been reported on the strength and behavior of concrete reinforced with natural fibers. Since natural fibers are available in abundant quantities in many developing countries, more elaborate research should be directed toward the various problems associated with the use of t…
The reaction of cubic ZrO2, with La(Co1−xNix)O3 was investigated by hot pressing at 1573 K. The reaction can been seen for all of x. The compositions of the reacted areas were estimated as La2Zr2O7, La2Zr(Ni0.6Co0.4)O6 and La2ZrNiO6 for x=0, 0.4 and 1, respectively. The width of the reacted area decreased with increas…
Energy release from a substance with relatively low oxygen compatibility is a situation which could result in the ignition and combustion of more oxygen-compatible materials such as the structural metals used in gaseous oxygen systems. At the present time there are no standard ASTM test methods for testing metals igni…
National audience
The authors developed an insulation diagnostic system that makes automatic measurements of the dielectric dissipation factor and DC component in a hot-line XLPE (cross-linked polyethylene) insulated power cable and makes an overall judgement of cable insulation deterioration. This system was tested on XLPE cables in h…
A new failure mode in AlCu and AlCuSi metallization is described in which interlevel metal short circuiting occurs between two or more levels of metal. Shorts are caused by theta-phase (Al/sub 2/Cu) hillocks which nucleate and grow during high-temperature vacuum heat treatment and processing, Hillock growth occurs at…
Abstract The role of catechol in benzene hydroxylation with Fe3+/catechol/H2O2 system, the so-called Hamilton system, has been mechanistically investigated by using tiron as a substitute for pyrocatechol. The yield of phenol progresses linearly with reaction time. The phenol yield is dependent on the mole ratio of Fe3…
The thermal behaviour of the reaction of phthalonitrile with a range of copper compounds has been investigated using differential scanning calorimetry with product analysis by infrared spectroscopy. Reaction with copper metal to give copper phthalocyanine (1) is exothermic and requires the presence of air or a small a…
Typical characteristics of various types of service loading are presented as they were discussed during the establishment of standardized test load sequences. Counting methods are reviewed and a simple and powerful algorithm is given to perform rainflow counting and to store the counting results afterwards. Synthesis…
The upward fire spread rates along the rods of six pure metals and ten steels have been studied for wide variations of the oxygen pressure, 0.1 MPa to 10 MPa, the test piece temperature, from room temperature to 1273 K, and the rod diameter, 1 to 3 mm. For the pure metals, aluminum, iron, lead, tin, titanium, and zinc…
A uniform description of the crystal structures of β -Si 3 N 4 and of compounds with the phenakite type structure is proposed, based on the fact that the latter are superstructures of the former. The cation ordering in α -LiGaSiO 4 that leads to space group R 3 is explained in terms of a superstructure of β -Si 3 N 4…
The influence of type of silk, age, and weighting agent on the physical and chemical deterioration of silk fabrics was evaluated by comparing the strength, elongation, amino acid content, viscosity, and infrared spectra of 54 undyed, historic silk fabrics with new silk plain weave fabric. Fiber fracture patterns also…
Tertiary recrystallization was observed after cold-rolling and annealing of conventional silicon steels. The magnetic induction B/sub 8/ at 800 AA/m of tertiary recrystallized sheets about 75- mu m thick is as high as 1.97 T. Magnetic domain width in these sheets is greater than 1 mm; hence domain-refining techniques…