Materials Literature
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The major developments in our understanding of polymer crystals and the kinetics of their formation have been many. It is now established that adjacent re-entry folding of the molecule occurs on crystallisation from solution, but when crystallised from the melt the molecular trajectory approximates a random coil when…
Tissue reactions toward biodegradable poly(L-lactic acid) implants were monitored by studying the activity pattern of seven enzymes as a function of time: alkaline phosphatase, acid phosphatase, alpha-naphthylacetyl esterase, beta-glucuronidase, ATP-ase, NADH-reductase, and lactate dehydrogenase. Cell types were ident…
Abstract The pH value of an adsorption edge (i.e., the pH value where a change occurs in the amount of aqueous ions adsorbed by a solid phase) is dependent on the surface‐metal bonding strength and, consequently, on the type of adsorption site involved. The metal‐adsorption sites of natural (untreated) kaolinite, mont…
Macromolecules
Dextran covalently linked to moieties of gadolinium diethylenetriamine pentaacetic acid (DTPA), for use as a macromolecular, intravascular blood pool marker for contrast material-enhanced magnetic resonance (MR) imaging was characterized by means of physicochemical and relaxivity measurements and MR imaging in healthy…
Boron-doped homo-epitaxial films were deposited by microwave plasma CVD on synthesized single-crystal diamonds. Boron concentration in the films was determined by the boron concentration in the reactant gases. The crystallinity of boron- doped films was found to be affected by the boron concentration in the reactant g…
Fasciclin I is a membrane-associated glycoprotein that is regionally expressed on a subset of fasciculating axons during neuronal development in insects; it is expressed on apposing cell surfaces, suggesting a role in specific cell adhesion. In this paper we show that Drosophila fasciclin I is a novel homophilic cell…
Auger electron spectroscopy (AES) was used to characterize laboratory produced bronze plated steel sheets and AES and x-ray photoelectron spectroscopy (XPS) were used to investigate the interphase layer between these sheets and rubber. These sheets were produced to simulate bronze coated steel wire used in tire beads.…
Magnetic and mechanical properties have been studied and compared for rotary forged aluminum compacts containing MQI and MQIII (isotropic and anisotropic melt-spun Nd-Fe-B, respectively) in the as-forged condition, and after subsequent heat treatment both above and below the Curie point. A maximum coercivity of 1165 k…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExcimer formation in sterically hindered poly(9-vinylcarbazole) and its dimer model compoundsShinzaburo Ito, Kazukiyo Takami, Yoshinobu Tsujii, and Masahide YamamotoCite this: Macromolecules 1990, 23, 10, 2666–2673Publication Date (Print):May 1, 1990Publication History Publi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and characterization of carbon atom bridged heterocyclic polymers of specified conjugation length. 1. Novel polyterthiophenesSamson A. JenekheCite this: Macromolecules 1990, 23, 11, 2848–2854Publication Date (Print):May 1, 1990Publication History Published online1…
Abstract Potassium‐Ca and NH 4 ‐Ca exchange reactions in soils are often investigated in laboratory‐type studies. In these studies, it is assumed that the results from the binary exchange systems can be extrapolated to ternary (three ion) exchange systems using appropriate models. This, however, is rarely evaluated. T…
Lead scandium tantalate (PST) is a ferroelectric relaxor with the perovskite structure of A(B′B″)O 3 . By suitable heat treatment, the B‐site cations can be brought from a stucturally disordered state into various degree of ordering. The degree of ordering is strongly affected by the amouth of vacancies present in the…
The effects of vanadium substitution on the magnetic properties of Sm-Fe-Ti-V melt-spun ribbons and the magnetic properties and microstructure of sintered Sm-Fe-Ti based magnets are reported. The highest coercivity, Hc =10.65 kOe, was obtained in a heat-treated melt-spun Sm8 Fe75.5 Ga0.5 Ti8 V8 alloy. This is the high…
Deux methodes couramment utilisees pour tester la periodicite, a savoir la minimisation de la dispersion de phase et la repartition par epoque (epoch-folding), sont discutees. En utilisant une analyse de variance, on demontre la relation entre ces 2 methodes. Une nouvelle statistique de tests est proposee, applicable…
In Fe-Nd-Ti and Fe-Sm-Ti the phase with the hexagonal structure of Co5R is stabilized by the addition of Ti and has a rare-earth content just above 12 at. %, but well below 16.7 at. %, so that it must be classified as a Cu7Tb type. It and Fe17R2 dissolve approximately 3 at. % Ti, accompanied by an increase in Curie te…
The visible spectra of a series of merocyanines, derivatives of 4-[(4-oxocyclohexa-2,5-dienylidene)ethylidene]-1,4-dihydropyridine, have been investigated in a number of solvents and solvent mixtures. The effect of substituents on the solvatochromic behaviour of these compounds is described. All investigated merocyani…
In this contribution a firm foundation to the observed complex permeability spectrum of ferrites (such as NiZn or MnZn spinels) in the gyromagnetic regime (100 MHz, 10 GHz) is provided. Many attributes of the initial permeability of uniaxial ferrites are not correctly reproduced by a straightforward application of the…
Large coercive fields have been obtained in melt-spun Co-Zr(Hf)-B based alloys. The highest coercivities have been observed in Co76 Zr18 B3 Si3 and Co78 Hf16 B3 Si3 samples with values 6.7 and 6.5 kOe, respectively. The saturation magnetization for both samples is estimated to be around 60 emu/g. Thermomagnetic data s…
The development of crystallographic texture in rapidly quenched Fe14Nd2B has been investigated by hot deformation. The method was to catch the process in a state of partial completion, and then use transmission electron microscopy to examine the structure. The degree of texture formation was determined by x-ray diffra…