Materials Literature
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A sequence of laminated sediment, 30 cm long, deposited in the deepest part of an eutrophic lake, Lovojärvi, in southern Finland, was analyzed microscopically. Seasonal changes in sedimentation were found to be well retained, due to the absence of bottom animals and the rather high sedimentation rate. Delimitation of…
Abstract A model is presented to account for the large variations in tensile and tensile impact strength of amorphous polymers from a consideration of an idealized entanglement network. The material strength under tensile impact conditions is shown to be predictable and to increase with the “fineness” of the entanglem…
Elastic fields of dislocation walls at the interface of a bicrystal are determined in both the isotropic and anisotropic cases. Singularities at the interface are represented in terms of line force fields. It is shown that the long–range portion of the stress field of the wall can be removed without introducing incomp…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPressure and Temperature Dependence of the Viscosity of Polymer Solutions in the Region of Phase SeparationB. A. Wolf and R. JendCite this: Macromolecules 1979, 12, 4, 732–737Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue…
The reaction of Zircaloy in steam at elevated temperatures involves the growth of discrete layers of oxide and oxygen‐rich alpha Zircaloy from the parent beta phase. The multiphase, moving boundary diffusion problem thus described is encountered in a number of important reaction schemes in addition to that of Zircaloy…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConformational dynamics of .alpha.,.beta.,.gamma.,.delta.-tetraarylporphyrins and their dicationsJennie Wang Dirks, George Underwood, Jolene Cox Matheson, and Devens GustCite this: J. Org. Chem. 1979, 44, 14, 2551–2555Publication Date (Print):July 1, 1979Publication History…
Abstract Phonon data are given for La 2 O 3 , Pr 2 O 3 , and Nd 2 O 3 single crystals. The polarized Raman spectra of Nd 2 O 3 are presented and analysed according to Pauling's structure: D 3d 3 (P 3 ml), Z = 1. A factor group analysis leads to the symmetries 2A 1g + 2 E g for the q = O lattice vibrations which give a…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism for the Formation of Chloromethyl Branches in Poly(vinyl chloride)W. H. Starnes Jr., F. C. Schilling, K. B. Abbås, R. E. Cais, and F. A. BoveyCite this: Macromolecules 1979, 12, 4, 556–562Publication Date (Print):July 1, 1979Publication History Published online1 Ma…
On account of self-similarity of the Gaussian function under Fourier transformation, the lattice energy of the Gaussian core model at absolute-zero temperature exhibits duality relations. In the cases of one and two dimensions the duality involves high- and low-density pairs for the single stable lattice structure. In…
Alkaline earth fluoride crystals doped with trivalent rare earth contain both isolated and clustered rare earths. Electronic nonradiative relaxation for isolated rare earths proceeds solely by multiphonon relaxation while for clustered rare earths, it proceeds by both efficient nonresonant energy transfer and multipho…
The temperature dependence of cathodoluminescence intensity and decay time in the range 10°–480°K is reported for both nominally pure and Ce 3+ ‐doped yttrium aluminum garnet (YAG) crystals. Luminescence from characteristic lattice defect levels and from the 2 D excited state of the Ce 3+ impurity have both been inves…
The effects of radiation sterilization on ultrahigh molecular weight polyethylene were explored by freeze fractures, electron spin resonance, absorption of aqueous media, density measurements, small-angle and wide-angle x-ray scatter, differential scanning calorimetry, infrared and ultraviolet-visible spectrometry, st…
The presence of Fe(CN)6(-4) provides sequential, one-electron reduction pathways for OSO4. An equilibrium is established containing OSO4, Fe(CN)6(-4), Fe(CN)6(-3), OSO2(OH)4(-4), and labile cyano-bridged OS-Fe species containing Os in nominal oxidation states of VIII, VII, and VI. These osmium complexes are chelated b…
Arterial prostheses seeded with autogenous vascular endothelium demonstrate a well-organized, cellular, inner lining. To determine the nature of the lining cells, six animals underwent replacement of the infrarenal aorta with Dacron prostheses. During the preparation of three such grafts, endothelium was scraped from…
Stress corrosion studies have been conducted with Type 304 stainless steel using a variety of electrochemical techniques at elevated temperatures. The object of these studies was to determine material response in simulated boiling water reactor environments. Anodic polarization curves and straining electrode experimen…
A model of current transport in ZnO varistors is proposed. The model is a modification of an earlier one suggested by Levine, with the major difference being the inclusion of a thin (?10 Å) ’’disordered’’ layer which separates the single-crystal ZnO grains. The proposed model is shown to be consistent with electrical…
Part one discusses the corrosion of copper and its alloys, including atmospheric corrosion, oxidation, corrosion by other gases, aqueous and nonaqueous corrosion, stress-corrosion cracking, erosion, radiation, underground corrosion and purposeful corrosion. Part two treats the corrosion of tin and its alloys including…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Basis for Miscibility in Polyester-Polycarbonate BlendsC. A. Cruz, J. W. Barlow, and D. R. PaulCite this: Macromolecules 1979, 12, 4, 726–731Publication Date (Print):July 1, 1979Publication History Published online1 May 2002Published inissue 1 July 1979https://pubs.acs.o…
Abstract The adsorption of Mn 2+ on two samples of powdered calcite with different surface areas has been studied using atomic absorption and electron spin resonance spectroscopy to investigate the solution and mineral phases. Chemisorption of Mn 2+ on CaCO 3 surfaces lowered the solubility of Mn 2+ below the level ex…
Metal catalysts are technologically very important. Moreover, these materials are intriguing systems for scientific investigation. In general, metal catalysts are highly dispersed materials, i.e., materials with very high surface areas. The study of these materials with chemical probes including chemisorption and sele…