Materials Literature
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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…
Molybdenum (VI) is shown to replace ‘capping’ vanadium(V) in the decavandate structure, once to yield monomolybdononavanadate [MoV9O28]5–, or twice to yield dimolybdo-octavandates [Mo2V8O28]4–. By potentioemtry and 51V, 17O and 95Mo n.m.r. spectroscopy, including 51V–51V correlation spectoscopy, the speciation and une…
The reactions of silyl radicals R3Si˙(R = Me, CD3, Et, MeO, ButO, or Me3SiO) with aminoboranes R1R2N[graphic omitted]BH2 in solution have been studied using e.s.r. spectroscopy. The silyl radicals add rapidly at low temperatures to 2,2,6,6-tetramethylpiperidinoborane and to N-t-butyl-N-methylaminoborane to give aminyl…
VO2 (A), a metastable phase of VO2, was prepared by hydrothermal treatment of an aqueous VOSO4 solution. (VO2 (A) has tetragonal symmetry but the crystal structure remains unknown. DTA and magnetic susceptibility measurements revealed a transition at 162°C which was detectable on heating but not on cooling. Semiconduc…
Abstract A recently developed analytical technique, modulus profiling, conveniently allows the mechanical properties of elastomers to be mapped with spatial resclutions approaching 0.05 mm. Thus, spatial heterogeneities in modulus caused by processing and aging phenomena can be easily monitored. This paper describes s…
The essential equations of solid–solid nucleation theory are summarised and the origins of the accelerated nucleation kinetics observed at grain boundaries are examined on this basis. Methods of measuring nucleation kinetics at grain boundaries are critically reviewed and the precautions which must be taken in order t…