Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation of Carbon Monoxide and Carbon Dioxide at Cesium-Promoted Cu(110) and Cu(110)-O SurfacesA. F. Carley, M. W. Roberts, and A. J. StruttCite this: J. Phys. Chem. 1994, 98, 37, 9175–9181Publication Date (Print):September 1, 1994Publication History Published online1 May…
The crystal field (CF) package applicable to orthorhombic or higher symmetry has been extended to enable calculations of energy levels and ligand field states for 3dN ions in crystals at arbitrary symmetry sites by taking into account the contributions of the ‘‘imaginary’’ CF terms. The full Hamiltonian matrix, includ…
Plates of SiC, TiB2 and Al2O3 were impacted edge-on with steel projectiles at striking velocities between 20 m/s and 1000 m/s. Fracture propagation in the specimen was visualised by means of a Cranz-Schardin camera within the first twenty microseconds. The phenomenology of damage is discussed and compared for the diff…
The performance of a composite film of polypyrrole (PPy) and poly(4‐styrenesulfonate) (PSS) was studied in combination with an organic electrolyte as a possible lithium battery cathode. The composite film had a fairly flat morphology and exhibited electroactivity in organic electrolyte solutions using dimethylsulfoxid…
A Monte Carlo simulation of the NO-CO catalytic reaction on a square lattice is presented. It is shown that a steady reactive state for this reaction exists when the adsorbed N atom is allowed to diffuse on the surface. The window width of this reactive state diminishes as the diffusion rate decreases. The power law b…
A modification of the Bodner–Partom elastic-viscoplastic constitutive model is proposed to account for strain rate dependence of the evolution of hardening. The suggested procedure is for the rate of hardening in the hardening evolution equation to be a direct function of total strain rate. Material constants are dete…
BACKGROUND: The early fate of in vitro-endothelialized prosthetic vascular grafts was assessed in the nonhuman primate. METHODS: Each of 17 male chacma baboons received a control and a confluently endothelialized 4 mm polytetrafluoroethylene graft in femoro-femoral positions (8.2 +/- 0.8 cm). All experimental grafts w…
Various ceramic specimen geometry and insert configurations being used for dynamic compression testing in a split Hopkinson pressure bar are analyzed numerically using DYNA2D. The objective of the analysis is to study the magnitude and locations of stress concentrations in the specimen, the degree to which the hard ce…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation J. R. Gillmor, R. H. Colby, E. Hall, C. K. Ober; Viscoelastic properties of a model main‐chain li…
The structure of the copper protein plastocyanin from poplar leaves (Populus nigra var. italica) at 173 K has been subjected to two independent refinements, using a single set of synchrotron X-ray data at 1.6 A resolution. Energy-restrained refinement using the program EREF resulted in lower root-mean-square deviation…
The chemical state of sulfur on (NH4)2Sx-treated InP(001) surfaces has been studied by high-resolution x-ray photoelectron spectroscopy. We find three kinds of chemical states of sulfur (S2p3/2 lines at 161.2, 162.0, and 163.4 eV) on the sample treated at RT. It is suggested that they correspond to sulfur in phosphoru…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption Studies on Boron Nitride SubstratesPraful Shrestha, Mazin T. Alkhafaji, Michelle M. Lukowitz, Guoliang Yang, and Aldo D. MigoneCite this: Langmuir 1994, 10, 9, 3244–3249Publication Date (Print):September 1, 1994Publication History Published online1 May 2002Publish…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlasses with Strong Calorimetric .beta.-Glass Transitions and the Relation to the Protein Glass Transition ProblemJ. Fan, E. I. Cooper, and C. A. AngellCite this: J. Phys. Chem. 1994, 98, 37, 9345–9349Publication Date (Print):September 1, 1994Publication History Published on…
A statistical interpretation of the Preisach model led to the moving model that relaxed the congruency property and to the complete moving hysteresis model (CMH) which included a state-dependent locally-reversible magnetization. Since, like all Preisach models, these models possess the deletion property, minor hystere…
Brittle fracture of β-SiC (polytype 3C) under hydrostatic tension has been modeled by molecular dynamics simulation using an interatomic potential function that treats the solid as fully covalent. The critical stress at which the lattice becomes structurally unstable is shown to agree quantitatively with that predicte…
Protein geranylgeranyltransferase type I (GGTase I) catalyzes the prenylation of a number of proteins that play important roles in cellular signaling. The recent cDNA cloning of this enzyme (Zhang, F. L., Diehl, R. E., Kohl, N. E., Gibbs, J. B., Giros, B., Casey, P. J., and Omer, C. A. (1994) J. Biol. Chem. 269, 3175-…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and Structures of Cyclic and Acyclic Metallasiloxanes of Groups 5-7Hans-Juergen Gosink, Herbert W. Roesky, Hans-Georg Schmidt, Mathias Noltemeyer, Erhard Irmer, and Regine Herbst-IrmerCite this: Organometallics 1994, 13, 9, 3420–3426Publication Date (Print):Septemb…
Condensation of pyrrole with a benzaldehyde and 4-pyridinecarboxaldehyde mixture yields the six possible meso-substituted phenyl or pyridyl porphyrins. Nitration of four of these has yielded 13 other porphyrins containing one to four 4-nitrophenyl moieties, and SnCl 2 reduction of eight of these nitrophenylporphyrins…
Ru and RuO 2 thin films were prepared by RF magnetron sputtering. The crystalline structure and electrical properties of these films were investigated. Reactive sputtering of a ruthenium metal target was carried out in a mixed gas of argon and oxygen at 580° C. Total pressure ( P O 2 + P Ar ) was controlled to maintai…
In the Al–Pd–Re system, two kinds of icosahedral phases (I-phases) with different quasilattice constants have been found to form at 1173 K. The I-phase with larger quasilattice constant is formed in a wide composition range at 1173 K: 13–25 at.%Pd and 10–15 at.%Re. The conductivity of single-I-phase samples varies gre…