Materials Literature
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The authors describe the experimental testing of the accuracy of the classical and generalized (nonlinear) Preisach models of hysteresis. The experiments performed for two typical magnetic tape materials show that both models are about equally accurate when the reversal values of the magnetic field are larger than or…
The intermetallic precipitates in Zircaloy are generally considered to be of special importance for the properties of the alloy. However, basic feature of the precipitate formation, such as the solubility limits of iron and chromium in a ZrSn matrix, are still unknown. Investigations have been performed with the objec…
Clear 3/8'' Lucite rod models at a scale of 1'' = D (the native-type period), and using four different colored ribbon markers to indicate one set of 'equivalent bands' in the SLS band pattern, clearly show the possible distribution of 'holes' and staining loci in native-type fibrils. Close-packed ordered arrays of the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHeteropolyvanadates containing two and three manganese(IV) ions: unusual structural features of Mn2V22O6410- and Mn3V12O40H35-Hikaru Ichida, Kenji Nagai, Yukiyoshi Sasaki, and Michael T. PopeCite this: J. Am. Chem. Soc. 1989, 111, 2, 586–591Publication Date (Print):January 1…
Studies of a wide range of intramolecularly five-co-ordinated silicon compounds with chelating nitrogen donors have been made, with a view to obtaining further information on the details of nucleophilic substitution reactions at silicon. The crystal structure of 2-(dimethylaminomethyl)-phenyl-1 -naphthylsilane has bee…
Thin films of polyimide were prepared by spin coating the poly(amide–acid) precursor onto copper and aluminum substrates, followed by the usual heat treatment to promote imidization (curing) of the film. Films prepared on aluminum substrates were completely cured during the heat treatment, as shown by x-ray photoelect…
Measurements of the effect of heat treatment following cold work on the yield and shape memory behaviour in a NiTi alloy are reported. Tensile behaviour is found to depend on test temperature and initial structure as well as annealing temperature. Minimum values of stress required for stress induced martensite, marten…
Results from particle squashing tests designed to simulate the process of rolled in lubricant debris in rolling element bearings, are presented and showed to compare well with an earlier published theory. Measurements of the harder anvils after squashing various hard particles confirm our earlier theoretical results,…
As the wettability of solid oxides by liquid metals gives important information on the development of composite materials, metal- ceramics joinings, and the behaviour of deoxidation products in liquid metal, a large number of papers have been published. However, there are large discrepancies among the values reported.…
Monomeric and dimeric species of phthalocyanines with four, 15-crown-5-ether (1,4,7,10,13-pentaoxacyclopentadecane) voids at the 2,3 positions (ML)(where M = H2, Cu, Zn, Ni, or Co), have been studied using optical absorption and magnetic circular dichroism (m.c.d.) spectroscopies. The ready solubility of these crown e…
The concept of grain-oriented fabrication in ceramics, which utilizes anisotropy either in morphology or some specific property of the particle, is reviewed. A fabrication method, which maximizes the grain orientation, is described for Bi(4)Ti(3)O(12 ). The process utilized plate-like morphology of Bi(4)Ti (3)O(12) pa…
Two broad categories of austenitic steels are considered in this review: (a) alloys based on the Fe–Mn–C system, typified by austenitic wear resistant (Hadfield) steels and (b) alloys based on the Fe–Mn–Cr system, typified by austenitic corrosion resistant steels. Advances made in recent years in understanding and imp…
A new range of electron donor–spacer–acceptor systems has been assembled using co-ordination chemistry to link the subunits; rates of photo-induced electron transfer to the same acceptor ligand imply that tetraphenylporphyrins and octa-alkyl porphyrins have different solvent reorganisation energies.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAliphatic versus aromatic carbon-hydrogen activation and the x-ray crystal structure of [IrH(H2O)(7,8-benzoquinolinato)(PPh3)2]SbF6Maryellen Lavin, Elizabeth M. Holt, and Robert H. CrabtreeCite this: Organometallics 1989, 8, 1, 99–104Publication Date (Print):January 1, 1989P…
The excited-state dynamics of the Tm3+ ions in a singly doped crystal of LiYF4 is analysed. The Stokes fluorescence processes are interpreted by taking into account the numerous coincidences between the fluorescences emitted by the Tm3+ ions and by considering two kinds of sites. The anti-Stokes fluorescence dynamics…
Description Advances in Thermoplastic Matrix Composites Materials Provides an overview of recent accomplishments in advanced aerospace thermoplastic composites. 18 pages cover these important issues: • Processing • Thermal and Mechanical Behavior • Delamination
From the crystallographical point of view, phyllotaxis can be identified with the study of spiral lattices. In this paper, we devote our attention to plane lattices of points. Through a conformal transformation, one gets a lattice of points aligned along a logarithmic spiral. Centuries ago, one recognized the central…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDiffusion of various dialkyl phthalate plasticizers in PVCRobson F. Storey, Kenneth A. Mauritz, and B. Dwain CoxCite this: Macromolecules 1989, 22, 1, 289–294Publication Date (Print):January 1, 1989Publication History Published online1 May 2002Published inissue 1 January 198…
Polyhydroxybutyrate (PHB) can be used as an alternative polymer to polylactide-glycolides for drug carrier production. It is a linear homopolymer biosynthesized by various strains of bacteria by condensation of D(-)-B-hydroxybutyric acid and used as an energy and carbon source. PHB can be obtained by extraction from b…
Nd-Fe-B alloys can be rapidly solidified to produce a highly stable, magnetically isotropic powder which can be processed directly into either bonded magnets or, if not pressed, into anisotropic magnets with energy levels exceeding 40 MGOe. Current processing methods are briefly reviewed, as are some of the unique adv…