Materials Literature
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A nonconstact technique for reducing the core loss of a grain oriented silicon steel has been developed by the use of Q-switched laser irradiation. Vaporization of the surface layer of the silicon steel by the laser irradiation induced a stress which resulted in a refinement of 180° domain wall spacing. This phenomeno…
Abstract Low‐and high‐density polyethylenes were irradiated by electron beams with dose of 2–50 Mrad and then immersed in aqueous solution of acrylic acid (monomer concentration from 30 to 100 wt %) for 10 min−5 h at a temperature of 25–40°C. The degree of grafting increases with time and levels off. High density poly…
Interaction between the glucose-specific enzyme III (enzyme IIIglc) of the phosphoenolpyruvate:sugar phosphotransferase system and the lactose permease was studied with membrane fragments from an Escherichia coli strain that overproduces the lactose permease. Substrates of the permease markedly and specifically stimul…
Surface core‐level shifts measured using photoemission with synchrotron radiation are reviewed for a variety of transition metals (Ta, W, Ir), rare earth metals (Yb, Sm, Gd, YbAl2), noble metals (Au), and semiconductors (Si, Ge, GaAs). Models of surface shifts are discussed, including the relationships of surface shif…
Abstract Scanning electron microscopy revealed that the organization of the interstitial micaceous mineral in the title sandstones depended on the manner of drying of the specimen. After air- and freeze-drying, the lath-like mineral tended to occur as mats densely packed against the pore walls, whereas after critical-…
Abstract Blends of the polyhydroxy ether of bisphenol‐A, Phenoxy, with the polyesters poly(1,4‐butylene adipate), poly(ethylene adipate), poly(2,2‐dimethyl‐1,3‐propylene succinate), poly(2,2‐dimethyl‐1, 3‐propylene adipate), poly(1,4‐cyclohexane‐dimethanol succinate), and poly(ϵ‐caprolactone), are found to exhibit the…
The passive film on iron in borate buffer has been studied with wide frequency range impedance techniques. Two well‐defined potential domains are observable, i.e. , above and below 1.0V vs. the reversible hydrogen electrode in the same solution (RHE). A discussion of the interpretation of electrochemical impedances an…
The effect of temperature on the structure and dielectric properties of a 52/48 mol % copolymer of vinylidene fluoride and trifluoroethylene has been investigated at temperatures up to 140 C. Undrawn or unpoled specimens contain an intimate mixture of two disordered crystalline phases, both of which undergo a large in…
Abstract In this work, the exchange reaction taking place in molten blends of bisphenol‐A polycarbonate and polybutylene terephthalate was studied. A direct transesterification mechanism catalyzed by titanium residues, present in commercial PBTP, was deduced. The transesterification reaction can be ‐stopped at various…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEster interchange in poly(ethylene terephthalate) and related model copolyestersMichael DroescherCite this: Ind. Eng. Chem. Prod. Res. Dev. 1982, 21, 1, 126–130Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Published inissue 1 March 1982h…
Available data on the absolute magnetization of nickel and iron at room temperature are reviewed, with the aim of finding the best values to use when these materials serve as calibration standards. The field dependence of magnetization is not negligible. Recommended values of magnetization are given at 21 °C and 10 kO…
A technique for separating anisotropy and porosity induced FMR line-broadening contributions in narrow linewidth polycrystals has been extended to large linewidth lithium ferrite materials. The FMR linewidth is measured versus frequency and temperature T. Since the porosity contribution is proportional to the magnetiz…
Hydrogen permeation in a high strength ferritic steel was shown to depend on the passivity of the surface and the presence of H 2 S . In the case where H 2 S is not present, an oxide on the surface of the steel reduced the kinetics of the proton discharge rate and, even more so, the kinetics of the molecular hydrogen…
The magnetization of Li-Zn ferrite, Li0.5−x/2ZnxFe2.5−x/2O4, with x = 0 to x = 1.0 Zn at./f.u. has been examined over the temperature range 4–950 K and for fields up to 90 kOe. Magnetization M and high-field incremental susceptibility χinc were compared with a calculation based on a localized canting model. A qualitat…
The martensitic phase of the shape-memory alloy equiatomic Ni─Ti has been examined by the high-resolution lattice-fringe imaging technique of transmission electron microscopy using axial illumination. This has, for the first time, shown evidence for the step and ledge structure of Type II twin interfaces, with the led…
An improved version of the split-Hopkinson pressure bar system for materials testing at high rates of loading is described. This new system has a preloading bar together with a pulse-shaping dummy specimen of the same material as the test specimen. Using the transmitted pulse through the pulse shaper as a tailored inc…
The conversion of heat to electricity by means of the pyroelectric effect is demonstrated here. The basic thermal-electrical cycle is described. The production of 100 mj of electrical energy per cubic centimeter of ferroelectric material (PZST) per thermal cycle (with a temperature span of 20°C) has been observed. Thi…
Reviews the theorem that the Maxwell action, and not just the field equation, is invariant under duality transformations.
Processes involving melting have been of fundamental importance in the origin and evolution of the Earth and other terrestrial planets, but thermodynamic data and physical properties of liquids necessary to calculate phase relationships are not well known, particularly at high pressures. We present revised fusion curv…
Due to the nonlinear nature of the relevant mathematical equations, previous solutions to the geometrically simple problem of pinning of a 180° ferromagnetic domain wall by a single planar defect in an infinite medium contain the approximation of small deviations in the nature of the defect material relative to the ho…