Materials Literature
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A general theory of stochastic transport in disordered systems has been developed. The theory is based on a generalization of the Montroll-Weiss continuous-time random walk (CTRW) on a lattice. Starting from a general mobility formalism, specialized $\stackrel{\mathrm{\ifmmode\acute\else\textasciiacute\fi{}}}{\mathrm{…
The formation of collagen cross-links is attributable to the presence of two aldehyde-containing amino acids which react with other amino acids in collagen to generate difunctional, trifunctional, and tetrafunctional cross-links. A necessary prerequisite for the development of these cross-links is that the collagen mo…
For pt. I see abstr. A37362 of 1971. In an interacting spin-phonon system, coherences in the phonon scattering from different ions lead to coupled spin-phonon modes and the thermal resistance arises from the finite lifetime of the coupled excitations. The phonon Green function is derived here by means of a diagrammati…
We have studied the nonlinear optical absorption in silicon at 1.06 \ensuremath{\mu}m using picosecond pulses. By measuring the time dependence of the induced absorption we are able to separate the effects of indirect simultaneous two-photon absorption and stepwise absorption processes. Values of the two-photon absorp…
Abstract Beim Abkühlen einer Schmelze aus Polybuten‐1 kristallisiert zunächst die tetragonale Modifikation II aus. Die Modifikation II ist instabil und wandelt sich langsam in die stabile hexagonale Kristallform I um. Unter dem Einfluß mechanischer Spannungen kann die Umwandlungsgeschwindigkeit II nach I beträchtlich…
Abstract Die Struktur und Eigenschaften verschiedener PVF‐ und PVF 2 ‐Handels‐ und Versuchsprodukte wurden unter anderem durch NMR‐Spektroskopie, Gelchromatographie (GPC), Röntgenbeugung, Differentialthermoanalyse (DTA) und Torsionsschwingungsmessung untersucht. Durch 19 F‐Resonanzmessung konnte gezeigt werden, daß be…
Abstract A series of polysulfone/poly(dimethylsiloxane) (AB) n block copolymers have been synthesized over a wide composition range by varying the molecular weights of the polysulfone and poly(dimethylsiloxane) blocks. The properties vary from a rigid material at high polysulfone content (>65% polysulfone) to an el…
Abstract This paper reviews several types of thermoplastic polyurethane elastomers, and the unique properties these polymers have. In discussing the hydrolysis stability of thermoplastic polyurethane elastomers the suitability of these polymers for such study was pointed out. A relationship between poly(ester‐urethane…
Abstract Die Verzunderungsgeschwindigkeit wird durch den Transport des oxidierendes Gases zur Feststoffoberfläche bestimmt. Dieser Stofftransport kann mit Hilfe der für strömende Medien geltenden Übergangsgesetze beschrieben werden, So daß es möglich ist, ein mathematisches Modell der Verzunderung in Abhängigkeit von…
Abstract The network analysis of the aged sulfur vulcanizates of nitrile rubber serves to re-emphasize the complexity of the structural changes which can occur at elevated temperatures. Three factors control the rate and degree of crosslinking in these systems. First there is the crosslink structure. An essential feat…
Abstract Fundamentals of composite material technology are applied to the investigation of multi‐ply cord‐reinforced rubber systems as used in pneumatic tires. The stiffness parameters of such multi‐ply systems are determined through the use of the elastic properties of the constituent cord and rubber components. The…
Hydrogen treatment was used to vary the Fermi level in Mo-doped rutile. The stable valence states ${\mathrm{Mo}}^{5+}$ and ${\mathrm{Mo}}^{3+}$ were detected by ESR measurements. The existence of the states ${\mathrm{Mo}}^{6+}$ and ${\mathrm{Mo}}^{4+}$ was inferred from the data. The previously unreported ${\mathrm{Mo…
Abstract Mineralogy of soil concretions, collected from Henry, Iredell, Tifton, and Decatur soils of the southeastern USA, were studied by DTA, X‐ray diffraction, and electron microprobe analysis. The results indicated the presence of considerable differences in mineralogical composition of concretions formed under di…
Abstract In order to clarify the effect of bulky substituents on the stereoregulation of vinyl monomers, vinyl‐1‐adamantanecarboxylate and vinyl 1‐adamantyl ether were synthesized and polymerized by radical and cationic mechanisms, respectively. As open‐chain models of the adamantyl group, vinyl trialkylacetate (alkyl…
Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text K. W. Martin and L. G. DeShazer, "Indices of Refraction of the Biaxial Crystal YAIO3," Appl. Opt. 12, 941-943 (1973) Export Citation BibTex Endnote (RI…
The crystal structure of the complex La(NO3)3.4(CH3)2SO has been solved by the heavy-atom method. The complex crystallizes in the monoclinic space group C2/e with four formula units in a unit cell of dimensions a= 14.94, b= 11.04, c= 15.54 A and fl= 109 ° 10'. The parameters have been refined by threedimensional least…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic and Structural Properties of Polystyrene-Polybutadiene-Polystyrene Block CopolymersE. Campos-Lopez, D. McIntyre, and L. J. FettersCite this: Macromolecules 1973, 6, 3, 415–423Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Publ…
The application of the typical metallic refractory compound lanthanum hexaboride as a thin-film material has been studied. Film properties are estimated by using bulk optical constants derived from a Kramers-Kronig analysis of the bulk material. Films with thicknesses of 130–2000 Å have been prepared by sputtering and…
Continuum theory is used to calculate the molecular alignment and the elastic deformation energy in a nematic layer containing a circular-loop thread. In agreement with experiment, planar solutions are found, with the thread being the boundary between regions of different pitch. It is shown that threads in nematics an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix Raman spectrum of the fluorine molecular anion, F2-Wilmont F. Howard and Lester. AndrewsCite this: J. Am. Chem. Soc. 1973, 95, 9, 3045–3046Publication Date (Print):May 1, 1973Publication History Published online1 May 2002Published inissue 1 May 1973https://doi.org/10.…