Materials Literature
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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…
Extensions are presented of research on partial-discharge-induced surface modifications of XLPE (crosslinked polyethylene) wherein the XLPE sample surface during corona exposure is maintained at an elevated temperature ranging up to 160 degrees C. As for the ambient temperature case, circular degradation patterns are…
Complexes of the ligand 1,2,5-thiadiazole-3,4-dithiol have been prepared; their spectroscopic and electrochemical properties show that they are potentially of use in preparing conducting materials.
A steady-state dual-electrode ring—disc technique which can be utilised to determine charge-transfer diffusion coefficients in electroactive and electronically conductive polymer films is described. The method has been applied to two different electroactive polymer films: a ruthenium containing redox polymer, [Ru(bpy)…
A description of soft magnetic powder composites, such as sinters, dielectromagnetics, and magnetodielectrics, and the problems associated with their application as magnetic cores in electrical converters is presented. Typical magnetic properties and methods of processing are reviewed and criteria for choosing the typ…
Synopsis We construct rank-one convex functions which are not convex and have linear growth at infinity. We show that these functions could be useful in some problems concerning weak convergence of gradients if we were able to prove that they are quasiconvex. This question, however, seems to be open.
Treatment of Cu2(OAc)4·2H2O with 2,2′-bipyridine (bpy) and NaClO4 in EtOH yields [Cu2(OAc)3(bpy)2](ClO4)(1) whereas the same reaction in hot water yields [Cu2(OH)(H2O)(OAc)(bpy)2](ClO4)2(2); the novel structures of the complexes are described, together with the results of magnetic susceptibility studies which show tha…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalysis by hetropoly compounds. 16. Catalytic oxidation and isotopic exchange of hydrogen over 12-molybdophosphoric acidNoritaka. Mizuno, Tetsuji. Watanabe, and Makoto. MisonoCite this: J. Phys. Chem. 1990, 94, 2, 890–894Publication Date (Print):January 1, 1990Publication…
Abstract The combination of high strength-to-weight ratio, excellent mechanical properties, and corrosion resistance makes titanium the best material choice for many critical applications. This article commences with a description of the historical perspective of titanium casting technology. It discusses the various t…
The effect of water concentration on the properties of three commercial soda‐lime‐silica glasses has been measured. Water (H 2 O) concentration varied from 50 to 550 ppm‐wt. Properties measured include glass transformation temperature, transformation range viscosity, thermal expansion coefficient, electrical conductiv…
It is noted that, approximately 25 years ago, commercial electronic instruments were brought on the market that heralded a new era in dielectric measurements; this electronic era is now rapidly drawing to a close, and is on the verge of being eclipsed by an era that could be called intelligent instruments. The develop…
The hot isostatic pressing (HIP) of four alumina powders is studied in the temperature range 1100° to 1400°C, at 5‐ to 200‐MPa applied pressure, and for times ranging from 0.5 to 4 h. Density increases with increasing HIP temperature, pressure, and time; decreasing grain size results in increased density after HIP. An…
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Rapid solidification processing generally results in fine grained and macrosegregation free microstructures and improves hot-workability of highly-alloyed metals (e.g., superalloys and high alloy steels).The Osprey Process is a technology capable of producing rapidly solidified materials in thick sections. The Process…