Materials Literature
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The room‐temperature fracture behavior of polycrystalline MoSi 2 was characterized using Vickers indentation fracture. Fracture analysis was aided by the optically active grain structure of MoSi 2 revealed under polarized light. Radial crack propagation from indentations was found to be predominantly transgranular. Th…
The research career of Karl F. Lindman, who has widely been referred to as being the first to demonstrate the effect of a chiral medium on electromagnetic waves, is described. During the first half of this century, Lindman completed an extensive research career, using essentially the same methods as Heinrich Hertz did…
Polycrystalline and amorphous Si-C films were prepared by rf glow-discharge decomposition of silane-methane mixtures at 700 °C. We have demonstrated that polycrystalline SiC films with large grains grow under heavy hydrogen dilution. The bonding properties as a function of film composition and hydrogen dilution were c…
Mg 10 Si 3 O 14 (OH) 4 crystallizes in the orthorhombic space group Pnnm with lattice parameters a =5.0894, b=13.968, c=8.6956A. This compound si part of a series related by crystallographic shear performed on an olivine-type structure.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMatrix-isolation and ab initio studies of oxalic acidJ. Nieminen, M. Rasanen, and J. MurtoCite this: J. Phys. Chem. 1992, 96, 13, 5303–5308Publication Date (Print):June 1, 1992Publication History Published online1 May 2002Published inissue 1 June 1992https://pubs.acs.org/doi…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGas-phase dissociation mechanisms of dilithiated disaccharides: tandem mass spectrometry and semiempirical calculations.Andreas Staempfli, Zhongrui Zhou, and Julie A. LearyCite this: J. Org. Chem. 1992, 57, 13, 3590–3594Publication Date (Print):June 1, 1992Publication Histor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysics of entwined porphyrin conjugates: competitive exciton annihilation, energy-transfer, electron-transfer, and superexchange processesAnne M. Brun, Stephen J. Atherton, Anthony Harriman, Valerie Heitz, and Jean Pierre SauvageCite this: J. Am. Chem. Soc. 1992, 114,…
Fatigue of ferroelectric polarization and the electric field induced strain is investigated in lead lanthanum zirconate titanate ceramics. Fatigue rate increases as the coercive field or the hysteretic nature of the electric field induced polarization of the ferroelectric ceramics increases. The ferroelectric polariza…
Lattice parameter data of cubic phases and cube roots of unit cell volumes of tetragonal phases in homogeneous ZrO 2 ‐containing solid solutions were compiled to examine the validity of Vegard's law. Except for ZrO 2 –CeO 2 and ZrO 2 –UO 2 systems, the data for cubic phases were expressed by the equation d = a s X + b…
Secondary-electron emission and Auger spectroscopies and total-secondary-electron-yield measurements have been employed to monitor the transformation of type-IIa diamond (110) induced by 1-keV Ar irradiation for a dose range between 7\ifmmode\times\else\texttimes\fi{}${10}^{12}$ and 6.2\ifmmode\times\else\texttimes\fi…
Ion-exchange in glass is a simple, flexible technique to realize optical fiber-compatible planar waveguide devices. Recently, neodymium-doped waveguide lasers operating at 1060 and 1300 nm have been demonstrated in this technology. Lasers operating at 1540 nm are desirable for telecommunication applications and the au…
Abstract The electrochemical quartz crystal microbalance has been employed to investigate the electropolymerization of pyrrole in a variety of aqueous electrolytes. In contrast to the generally accepted cation–radical coupling process for the electropolymerization of pyrrole, an electrochemically initiated chain polym…
Models for understanding the properties of relaxor ferroelectrics are reviewed, a new model being proposed.
Rapid-scanning stopped-flow (RSSF) UV-visible spectroscopy has been used to investigate the effects of single amino acid mutations in the alpha-subunit of the Salmonella typhimurium tryptophan synthase bienzyme complex on the reactivity at the beta-subunit active site located 25 to 30 A distant. The pyridoxal 5'-phosp…
Oxygen vacancies can be introduced into zirconia solid solution ZrO 2 –MO u ( u = 1 and 1.5) to maintain electroneutrality. Recently, the local structures around Zr 4+ and M 2 u + ions in ZrO 2 –MO u solid solutions have been studied through EXAFS spectroscopy, diffuse scattering analysis, and single‐crystal structure…
Proline utilization by Escherichia coli and Salmonella typhimurium requires expression of genes putP (encoding a proline transporter) and putA. Genetic data indicate that the PutA protein is both put repressor and a respiratory chain-linked dehydrogenase. We report a redesigned purification procedure as well as the ph…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA ferrochelatase transition-state model. Rapid incorporation of copper(II) into nonplanar dodecaphenylporphyrinJun Takeda, Toshie Ohya, and Mitsuo SatoCite this: Inorg. Chem. 1992, 31, 13, 2877–2880Publication Date (Print):June 1, 1992Publication History Published online1 Ma…
The electronic structure of ${\mathrm{La}}_{2\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Sr}}_{\mathit{x}}$${\mathrm{NiO}}_{4}$ is studied by use of photoemission spectroscopy, bremsstrahlung-isochromat spectroscopy (BIS), and electron-energy-loss spectroscopy. Quantitative analyses are made on the valence-band and N…
We have studied the organization of the cytoskeleton in both unstimulated and stimulated cultured chromaffin cells, as well as its relationship with their secretory process by exocytosis. We found the spatial heterogeneity in the intensity of cortical rhodamine-phalloidin staining within a cell. The overall staining p…
An investigation is carried out on the feasibility of calculating the diffuse scattering from computer simulations of crystals containing substitutional and displacement disorder which have hitherto been used in conjunction with optical transform methods to aid in the interpretation of observed X-ray diffraction patte…