Materials Literature
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This work demonstrates the usefulness of flow microcalorimetry for surface characterization of metal foils (aluminum) and polymer [poly (ethylene-co-acrylic acid)] fibers. It shows that the polymer to aluminum adhesion is dominated by Lewis acid/Lewis base type interactions. These interactions are predictable from the…
Humidity-induced movements were studied on biaxially stretched samples of sized and gessoed fabric and on films of size and gesso without fabric. In-plane strains were detected through observation of crack patterns formed in a brittle coating applied on the samples. Different patterns recorded during drying and humidi…
Intercalation of phosphorus-doped SnSe2 with bis(cyclopentadienyl) cobalt {Co(η5-C5H5)2} produces superconducting SnSe2{Co(η5-C5H5)2}0.33 with a critical temperature of 6 K; magnetisation measurements show a hysteresis loop with a maximum at 40 G, indicating type II superconducting behaviour; the lower critical field…
In order to develop low activation high chromium ferritic steels for fusion reactors, the effects of 0.05-0.16 wt% Ta and 0.05 wt% Nb alloyings, and heat treatments on elevated temperature strength, toughness and microstructures of 0.1C-9Cr-2W-0.2V-0.04N steels were investigated. Normalizing and tempering conditions w…
Abstract Supersaturation is the driving force for crystallization from solution. For design and operation of crystallization processes, it is necessary to apply a set of criteria for the determination of appropriate or even optimum supersaturation. In this paper we present and discuss the results of our experimental a…
The plasma-arc melting process has reacently been noted for the refining and degassing of several metals, by applying hydrogen to the plasma-generating gas.In this work, deoxidation and decarburization of crude tantalum, prepared by carbon-reduction smelting of Ta2O5 with Ar plasma-arc heating, has been investigated b…
Tests of austenitic stainless steel clad U-xP-10Zr fuel (x=o, 8, 19 wt. %) to peak burnups as high as 18.4 at. % have been completed in the EBR-II. Fuel swelling and fractional fission gas release are slowly increasing functions of burnup beyond 2 at. % burnup. Increasing plutonium content in the fuel reduces swelling…
The laser conditioning of dielectric thin film HR coatings has been studied as a practical method for the improvement of the damage thresholds of large area (1.1 m dia.) high power 1064 nm laser mirrors on the LLNL 120 kJ, 100 TW Nova laser system. Both HfO2/SiO2 and ZrO2/SiO2HR coatings were conditioned by rastering…
Breeding experiments revealed that the white coloration of shell (prismatic layer) of the Japanese pearl oyster is inherited under the control of a recessive gene. Three matings were made: in two of them white female mated to white male in the other white female with brown (most common type) male. All the offsprings f…
Aqueous molybdenum(VI) has been studied between pH 6 and 1.2 by 17O and 95Mo n.m.r. spectroscopy. Heptamolybdate, [Mo7O24]6–, its monoprotonated form, and β-octamolybdate, [Mo8O26]4, are clearly identified, and evidence has also been found for an intermediate species [H3Mo8O28]5–. The protonation site of heptamolybdat…
Anisotropic effect of magnetohydrodynamics on solidification of Pb-10%Sn alloy has been studied in a magnetic field generated by a superconducting magnet. Experimental castings have been conducted with a mold designed to solidify the alloy unidirectionally. It has been observed that equiaxed structure changes to colum…
A simple analysis of the local linear density of a yarn yields an equation of its overall variance, which has three components: variance of the number of fibers per cross section, variance of the mean local fiber fineness, and that of the mean parameter of fiber inclination relative to yam axis. Further mathematical a…
An explanation is provided for thermal degradation on the basis of thermokinetics. Several transformation equations are defined. These transformations predict thermal endurance characteristics of insulating materials for end points, different from those used for reference characterization, without resorting to the exp…
An improved sessile drop technique was used to measure the changes in contact angle of a reaction system (Al/MgO). By plotting the results on a logarithmic time scale, the authors arrived at a new understanding of the wetting process. It was found that the contact angle progresses through three phases and that it is n…
A theoretical approach to teaching the principles of electrodynamic levitation is described. Two theories are used to obtain analytical solutions to predict the performance of a simple MAGLEY arrangement. The first theory, based on Maxwell's equations and vector force relationships, is for a simplified model allowing…
The reflectivity of the end facet of a 3-D dielectric waveguide can be easily calculated, in case of weak guidance, by replacing the waveguide with a homogeneous medium of refractive index neq while the incident electric (or magnetic) field remains that of the guided mode. The calculation is done through a plane-wave…
We review some recent results concerning numerical studies of the Cahn-Hilliard equation in three dimensions to describe the phase separation process in a mixture after a quench within the coexistence curve. We focus on the late time behavior for two experimentally relevant systems: binary alloys and binary polymer bl…
The corrosion behavior of (Nd,Dy)FeB permanent magnets has been studied in oxidizing environments by conversion electron and transmission Mossbauer spectroscopy. It is found that the Nd/sub 2/Fe/sub 14/B hard magnetic phase is not affected by ageing in 90 degrees C with 50% and 90% relative humidity. The oxidation occ…
The principal properties involved in evaluating handle subjectively are identified and quantitatively described. In addition, these properties are linked to known methods of measuring the various physical properties involved. A study of a small group of commercially manufactured double-jersey fabrics produced a method…
The 29Si MASNMR and 27Al NMR study of an amorphous silica–alumina catalyst and of its dealuminated forms suggests that the tetrahedral aluminium (AlIV) is involved in Q4[Si(1Al)], Q4[Si(2Al)] and possibly Q3[(SiO)2(AlO)SiOH] units. Species Q4[Si(0Al)] are also evidenced. Ca. 30% of the Al is tetrahedral and 70% octahe…