Materials Literature
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A description is given of detailed analyses of neutron powder diffraction data on Nd2Fe14B at several temperatures, and relationships between the crystal structure and the magnetic properties via comparison with other rare earth-transition metal systems, Nd2Fe17 in particular, are discussed. Diffraction studies have a…
Synopsis Substantivity of various (125)I-labelled collagen hydrolysates to virgin or bleached and dyed European hair or human callus was tested under conditions which simulated actual application of such hydrolysates in shampoos or foam baths. Factors which most strongly influence protein substantivity were identified…
The influence of acidity on the thermochemical stability of molten sodium nitrate‐nitrite mixtures used as heat‐transfer fluids (as in the case of the French electrosolar power system called Thémis) has been demonstrated by considering the diagram relative to redox systems corresponding to these mixtures and been esta…
The method for determining of optical constants of weakly absorbing plane-parallel films from the fringe pattern of the transmittance spectra is extended. The model supposes that the film thickness varies slowly but that the surface of the film is smooth, so that scattering of the beam can be neglected. A simple appro…
The systematics of [001] twist boundary structure is presented formally in terms of a structural unit/grain boundary dislocation hierarchical model and the earlier model of Sutton is generalized. By comparison with experimental observation and atomistic calculation using pair-potential models the physical significance…
An energy transfer from 5D3 and 5D4 levels of Tb3+ to 2D3/2 state of Ce3+ in Ce3+:Tb3+:YAG was studied using time resolved spectroscopy. It was found that the transfer from the Tb3+(5D3) level proceeds via (d–d) interaction and the critical distance is 18 Å. The transfer from Tb3+(5D4) state was consistent with the (d…
Electrochemical corrosion rates of 70Cu-30Ni alloy have been measured in oxygenated 0.5M NaCl and in synthetic seawater by the Tafel extrapolation procedure using a rotating disk electrode system. The rotation rate was varied from 500 to 6000 rpm. A log-log plot of the corrosion current vs rotation rate was linear, wi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsothermal growth of low molecular weight polyethylene single crystals from solution. 2. Melting and dissolution behaviorW. M. Leung, R. St. John Manley, and A. R. PanarasCite this: Macromolecules 1985, 18, 4, 753–759Publication Date (Print):April 1, 1985Publication History…
This paper is a brief review of the relationship between the structure and the mechanical properties of grain interfaces. Early work had inferred that such a correlation exists from experiments with bicrystals of different orientations. More recently, the advances in the understanding of grain boundary structure have…
A plausible model is used to derive formulas for the expected number of fibers with zero, one, or two ends in a given length segment of a random assembly of aligned fibers. These results are then combined to form the expectation of the number of ends and various related quantities. By making a stronger assumption, an…
Abstract The uptake of 137-Cs and 90-Sr on to synthetic zeolite A has been studied. The use of a combined barium exchange followed by a relatively mild heat treatment has been shown to fix the isotopes within a collapsed zeolite structure. Leaching experiments using deionized and simulated sea and pond waters were car…
Abstract The presence of organic acid salts in bisphenol‐A polycarbonate (PC) completely modifies the crystallization mechanism, the melting behavior, and the morphology of the polymer. Organic salts are not ordinary nucleating agents for PC since they react with the polymer, producing metal phenoxide chain ends. On r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTemperature dependence of the hydrodynamic radius of flexible coils in solutions. 3. Experimental evidence for the crossover between Gaussian and excluded-volume single chain statisticsPetar Vidakovic and Francis RondelezCite this: Macromolecules 1985, 18, 4, 700–708Publicat…
Bacteroides oulorum, a new nonpigmented, saccharolytic species from oral cavities, is described. This species differs both biochemically and chemically from related taxa, such as Bacteroides oralis, Bacteroides buccalis, Bacteroides denticola, Bacteroides veroralis, and Bacteroides pentosaceus. The major fermentation…
Abstract A series of tetrasilicic Na-micas with variable layer charges (x) between x=1 and x=0.32, NaxMg3−xLix(Si4O10)F2, was synthesized. The expansibility of the synthesized Na-micas upon swelling increased with decreasing layer charge.
Article Zielpräparation zum transmissionselektronenmikroskopischen Nachweis der Phase Al3Fe (Θ-Phase) auf tauchaluminiertem, niedriglegiertem Stahl / Target Preparation for the Transmission Electron Microscopic identification of the Al3Fe (Θ-Phase) in Hot-Dip Aluminised Low Alloyed Steel was published on April 1, 1985…
This paper considers the available evidence for relationships between grain boundary structure and diffusion. In any one material the boundary structure is a function of geometry, solute segregation and, in the case of compounds (e.g. oxides), non-stoichiometry. The effect of these parameters on boundary diffusion in…
We have investigated the influence of surface plasmon polaritons (SPP’s) on the reflection spectra of Ag-Al2O2-Al and Al-AL2O2-Al junctions in the visible range. The SPP’s were excited via sinusoidal grating structures. The SPP photon coupling efficiency was optimized as a function of the grating modulation height and…
The fracture behaviour of a series of austenitic high chromium cast irons (15%Cr and 2.7% C) containing a constant volume percentage of M7C3 eutectic carbides in distributions that, varies from continuous network to isolated globules was studied.The modification of the eutectic carbide morphology was achieved by the a…
The central practical problem which has impeded the development of the valence-bond theory of molecular electronic structure for the past fifty years has been the so-called nonorthogonality problem. In this article we develop a new method for calculating electronic energy matrix elements between Slater determinants co…