Materials Literature
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Phase transitions of a system showing incommensurate phase and also critical point between commensurate and para-electric phases are studtied in an electric field. An effect of higher harmonics of the modulated phase on an appearance of a tricritical point is discussed. Some comments on the phase transition of NaNO 2…
The effect of interference between the various components of a system of spheres in the scattering function at small angles has been investigated in the framework of the Born–Green kinetic theory of fluids. Calculations have been made for close-packed systems of spheres with Schultz distribution of radii and two types…
Abstract Der Einfluß des mittleren Molekulargewichts (Viskositätsmittel) von Naphthalinsulfonsäure‐ und Melaminsulfonsäure‐Formaldehyd‐Polykondensaten auf ihre Eigenschaften als Dispergiermittel wurde an wässrigen Portlandzement‐ und Anhydritsuspensionen untersucht. Die rotationsviskosimetrische Erfassung der Dispergi…
The tensile deformation behaviour of high-purity niobium single crystals has been evaluated at temperatures between 4·2 and 77 K. An athermal plateau in the yield and thermal stresses between 40 and 77 K has been demonstrated. Anomalies were observed in the strain-rate sensitivity at all temperatures within this plate…
The three dimensional finite element analysis of eddy current problems using the complex magnetic vector potential is applied to a practical three phase power transformer. The eddy current densities in the oil tank and other steel structure parts and the magnetic flux densities in the whole transformer are computed. S…
Magnetic torque measurements have been made for a single crystal of Co of hcp structure in a very low field region where the torque intensity was not saturated. In this region it had been considered to be impossible to determine the magnetocrystalline anisotropy constants from observed torque curves. Recently, a new m…
Because of their importance to the development of magnetoresistive recording heads, the thickness dependence of the magnetoresistive properties of thin R.F. sputtered Permalloy films has been measured in the thickness range from 220Å to 5490Å. It was found that the\Delta\rho = \rho_{\parellel} - \rho_{\perp}exhibits a…
Summary A simple, single‐step extraction with LiEDTA for the estimation of CEC and exchangeable bases in soils has been developed. Multivalent cations are stripped from the soil adsorption sites by the strongly chelating agent EDTA, and are replaced by Li. In soils without CaCO3 or water soluble salts, exchangeable di…
The non‐ionic surfactant, Tween 80, stimulated the secretion of extracellular proteins by 35–140% in Thermomonospora curvata during growth on a variety of substrates. Cellulase secretion was also stimulated but fractionation of extracellular proteins by ion‐exchange high performance liquid chromatography showed that t…
The effect of the substitution of Fe by Co and Al in Nd2Fe14-x-yCOxAlyB (0 \leq x \leq 2, 0\leq y\leq 1) alloys on their domain structure has been investigated. The observations of the domain structure have been carried out at room temperature by means of the magneteoptical polar Kerr effect. The domain wall energy de…
A critical assessment is given of the likely modes of thermal decomposition of RDX. Previous publications by other authors report that thermally decomposed RDX produces nitroxide and nitronylnitroxide radicals as intermediates. These results are discussed, and it is suggested that these radicals are not primary decomp…
TEM studies of Zr-containing 2:17-type permanent magnet alloys show that the cellular microstructure develops from a high temperature 2:17R phase, first by the precipitation of Sm-depleted, Zr-rich "2:17H" platelet phase, then by the precipitation of Cu-rich, Fe- and Zr-depleted "1:5" boundary phase. These results are…
The complex 1 can be regarded as a kind of “inorganic sandwich compound” without metal–metal bonds: It contains an MnII atom sandwiched between two relatively flat [MnO2] moieties. 1 is obtained in the form of black crystals on treatment of [Mn3O(O2CPh)6(py)2(H2O)] in acetonitrile with solid salicylic acid. Noteworthy…
This paper considers the heat-to-heat variability in corrosion resistance and microstructure that might be encountered in low carbon AISI 316 nuclear grade stainless steels (SSs). The results will show that although these low carbon steels are rather resistant to sensitization by chromium depletion, they vary signific…
The outgassing rates of a vacuum remelted type 316L stainless steel were measured as a function of baking temperatures, baking durations, and air exposure/baking cycles. Long-time baking, as was expected, reduced the outgassing rate of the stainless steel. A subsequent air exposure and short-time baking in vacuum was…
This paper reviews the recent developments of Fe-Cr-Co permanent magnet alloys. The Fe-Cr-Co alloys offer magnetic properties comparable to those of Alnico alloys, but with a distinct advantage of being ductile and containing less cobalt. Considerable effort has been expended in understanding the relationship between…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolylactones. 10. Cationic polymerization of .delta.-valerolactone by means of alkylating reagentsHans R. Kricheldorf, Ruth Dunsing, and Angela SerraCite this: Macromolecules 1987, 20, 9, 2050–2057Publication Date (Print):September 1, 1987Publication History Published online…
The strain rate and strain rate history effects on the inelastic stressstrain behavior of annealed A‐36 structural steel at room temperature are examined experimentally under monotonic and cyclic loading conditions. The strain rate used is between 10-6-10-1/sec, which covers the range that might be experienced by stee…
Abstract Electron spin resonance (ESR) of γ‐irradiated poly(vinyl alcohol) (PVA) at room temperature has been used to identify the radiation damage products. The ESR spectrum is analyzed by using least‐squares fits between observed and calculated spectra, assuming various free radical species. The best theoretical fit…
Abstract The Raman spectra of polycrystalline samples of the metavanadates M II V 2 O 6 (with M = Ca, Cd, Cu and Mg), belonging to the brannerite structural type, have been recorded. A general assignment, supported by comparisons with known vibrational properties of other oxovanadium species, is proposed. The compound…