Materials Literature
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Abstract The techniques of density, birefringence, and wide X‐ray diffraction were employed to characterize the microstructure of injection molded polyethylene parts. Generally, maximum crystallinity (density) occurs at the center of the molding, while the minimum crystallinity occurs near the surface. Higher densitie…
UNLABELLED: An animal model was developed to study the histology and collagen chemistry of healing cortical bone. A hole was cut through the cortex of the mid-shaft of the humerus of the adult chicken, which allowed for repair at a mechanically stable site. After one to two weeks the collagen of the repair tissue, whi…
A three dimensional finite element formulation and algorithm for the solution of 3-d magnetic fields was developed. The method is presented here with applications to determination of local flux densities in a 3-d field pattern, as well as global energy calculations of an air cored coil. The results compare well with c…
Summary The maghemitization process, by which magnetic minerals with spinel structure become progressively oxidized but remain single phase spinels, seems to be an important feature of submarine weathering. Whether the process takes place by the minerals acquiring oxygen from the sea-water or by the sea-water leaching…
Intermediatry steps in cellulose synthesis in Acetobacter xylinum were studied with resting cells and particulate-membranous preparations of the wild-type strain and of a celluloseless mutant. Exogenously supplied [1-14C]glucose was rapidly converted by resting cells of both types into glucose 6-phosphate, glucose 1-p…
Abstract EPR of Cu(H 2 O) pseudo Jahn‐Teller (JT) centres in dia‐ and paramagnetic Tutton salt crystals A 2 M(SO 4 ) 2 . 6H 2 O (I) with A = Rb, Cs, NH 4 and M=Zn, Cu and K 2 M(ZrF 6 ) 2 . 6H 2 O (II) crystals in the temperature range 300 to 4.2 K at frequencies 9.5 and 37 GHz is studied. The dynamic JT nature of Cu(H…
Abstract Proton conductivity is an outstanding feature of Al(OH) 3 , Mg(OH) 2 , and Ca(OH) 2 powders between room temperature and their respective dehydration temperatures. It can be measured by using Pd‐black electrodes in H 2 either by d.c. conductivity measurements, applying high injection voltages (> 10 4 V/cm)…
Abstract A prevalent view is that the red clayey parent material (terra rossa) of Crider and associated soils is a residual product from solution of limestone in the karst of southern Indiana. The sharp, abrupt contact between terra rossa and limestone provides no evidence to support the concept of a residual origin f…
Abstract Europium(III) chelates of dibenzoylmethane (DBM) ( 1 ) and β‐diketone‐containing polymers, i.e., poly( p ‐benzoylacetylstyrene) ( 2 ) and poly(aryl β‐diketone) ( 3 ), were prepared. In the polymer 2 the β‐diketone moiety is attached to the phenyl ring, and for polymer 3 the β‐diketone group is incorporated in…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Morphological Properties of a Triblock Copolymer of the ABC TypeYuhshuh Matsushita, Haruhisa Choshi, Teruo Fujimoto, and Mitsuru NagasawaCite this: Macromolecules 1980, 13, 5, 1053–1058Publication Date (Print):September 1, 1980Publication History Published on…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular Motion in Polycarbonate and Modified PolycarbonatesT. R. Steger, Jacob Schaefer, E. O. Stejskal, and R. A. McKayCite this: Macromolecules 1980, 13, 5, 1127–1132Publication Date (Print):September 1, 1980Publication History Published online1 May 2002Published inissue…
The effect of interfacial decohesion, due to the thermal expansion mismatch, on the thermal diffusivity of a hot‐pressed glass matrix with a dispersed phase of nickel was investigated by the laser‐flash technique at 25° to 600°C. The interfacial gap formed on cooling acts as a barrier to heat flow and lowers the therm…
Microtubule disassembly has been studied using a rapid dilution technique (Karr, T.L., and Purich, D.L. (1979) J. Biol. Chem. 254, 10885-10888). Disassembly curves, generated by computer from the solution of series first order differential equations (see following paper), were fit to experimental data with excellent a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and spectroscopic properties of violet glutathione-copper(II) complex with axial sulfur coordination and two copper sites via a disulfide bridgeKiyonori Miyoshi, Yukio Sugiura, Kazuhiko Ishizu, Yoichi Iitaka, and Hikaru NakamuraCite this: J. Am. Chem. Soc.…
Summary Formation of hydroxy‐Al (HA) and hydroxy‐aluminosilicate (HAS) ions was studied in solutions of A1C1 3 , orthosilicic acid and NaOH. Evidence for incorporation of Si into HA is that HA retarded the development of silicomolybdate colour and Si was retained by a cation‐exchanger. The reaction is believed to be m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnalysis of the Room-Temperature Molecular Motions of Poly(ethylene terephthalate)M. D. Sefcik, Jacob Schaefer, E. O. Stejskal, and R. A. McKayCite this: Macromolecules 1980, 13, 5, 1132–1137Publication Date (Print):September 1, 1980Publication History Published online1 May…
A simple mathematical formalism for describing arbitrary hysteresis processes is presented. The information required to apply this formalism to a given magnetic material can be obtained with relatively little effort from experimental hysteresis curves such as normal loops or, in special cases, from just the initial cu…
A discussion is given of various models for the Verwey transition in Fe3O4and Ti4O7, and its apparent absence in Sm3S4. In allsystems there is evidence for polaron formation, and for bipolarons in the first two. It is suggested that, in spite of polaron formation, in low-temperature Fe3O4 there must be considerable ov…
A detailed investigation on the thermal expansion, magnetic properties and electrical resistance of rapidly quenched amorphous (Fe,Co,Ni)-Zr alloys has been undertaken. Magnetic properties of these alloys are reported separately in this conference. The thermal expansion curves exhibit typical invar characteristics bel…
Summary Arsenohauchecornite, Ni 9 BiAsS 8 , and tellurohauchecornite, Ni 9 BiTeS 8 from the Sudbury area, Ontario, are now recognized as distinct mineral species in the Hauchecornite Group and not as varieties as described previously. Descriptions of these two minerals are given, summarized from Gait and Harris (1972).