Materials Literature
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Lead magnesium niobate (Pb(Mg 1/3 Nb 2/3 )O 3 or PMN) exhibits many attractive properties required by actuators for precision submicron control. At room temperature hysteresis is negligible, thermal expansion is less than 1 microstrain degrees C -1 , and the longitudinal strain sensitivity is 375 microstrain at 600 V…
The in situ cutting method to expose bare lithium metal, the corrosion potential‐time transients, and voltammetric measurements have been employed to study the behavior of lithium in various organic electrolyte environments. In situ optical and ex situ scanning electron microscopy techniques were used to examine the m…
Abstract A series of new side‐chain liquid‐crystalline copolymers has been prepared, and the thermal properties of the individual copolymers have been determined. These copolymers are derived from atactic polystyrene and contain both 4‐methoxyazobenzene and 4‐nitroazobenzene mesogens; these are linked through octyl sp…
The cDNA encoding human dCMP deaminase was isolated from a lambda ZAPII expression library using an antibody generated against highly purified HeLa cell dCMP deaminase. The cloned cDNA consists of 1856 base pairs and encodes a protein of 178 amino acids with a calculated molecular mass of 19,985 daltons. The sequence…
This paper reports the development of exciplex-based vapor/liquid visualization systems based on exciplexes formed from tertiary amines and fluorine-substituted benzene and/or toluene. These systems are expected to be virtually coevaporative with solvents (fuels) boiling in the temperature range 70 to 110°C and thus a…
A general life model, valid for any type of insulating material, with or without evidence of an electrical threshold at room temperature, is proposed. The definition of threshold is changed; the behavior of materials is classified as threshold or no-threshold according to the value of applied stresses. The electrical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and structure of [Sb7Ni3(CO)3]3-: a new structural type for nido 10-vertex polyhedral clustersScott Charles, Bryan W. Eichhorn, and Simon G. BottCite this: J. Am. Chem. Soc. 1993, 115, 13, 5837–5838Publication Date (Print):June 1, 1993Publication History Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies toward the total synthesis of (+)-ptilomycalin A. Use of a tethered Biginelli condensation for the preparation of an advanced tricyclic intermediateLarry E. Overman and Michael H. RabinowitzCite this: J. Org. Chem. 1993, 58, 12, 3235–3237Publication Date (Print):June…
Abstract The enzyme‐mediator‐conducting polymer model provides a convenient charge transporting immobilization matrix for redox enzymes in potential biosensor constructions. This study considers the charge transport mechanism in the benzoquinone (Q)‐polyaniline (Pani) system. An enhanced current can be obtained on Pan…
A high-pressure single crystal XRD study of KAlSi 3 O 8 with the tetragonal hollandite structure has been completed to 4.47 GPa. The a axis is approximately twice as compressible as c, so c/a increases with pressure. This anisotropy is similar to that of the structurally related mineral stishovite, though hollandite i…
A version of subtilisin BPN' lacking the high affinity calcium site (site A) has been produced through genetic engineering methods, and its crystal structure refined at 1.8 A resolution. This protein and the corresponding version containing the calcium A site are described and compared. The deletion of residues 75-83…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTProbing miscibility and intermolecular interactions in solid polymer blends using the nuclear Overhauser effectJeffery L. White and Peter MirauCite this: Macromolecules 1993, 26, 12, 3049–3054Publication Date (Print):June 1, 1993Publication History Published online1 May 2002…
ADVERTISEMENT RETURN TO ISSUEPREVArticlePreparation and properties of new .pi.-conjugated poly(quinoxaline-5,8-diyl) and poly(2,3-diethylquinoxaline-5,8-diyl). Enhancement of electron-accepting properties of poly(arylenes) by introduction of imine nitrogenTakaki Kanbara and Takakazu YamamotoCite this: Macromolecules 1…
These papers discuss topics including: nonlinear optics in periodic diffractive structures; viscoelastic finite difference modelling; waveform inversion through MBTT reformulation; electromagnetic wave scattering; and elastodynamic inverse obstacle scattering.
We have investigated the excited-state absorption spectra of four ${\mathrm{Eu}}^{2+}$-doped materials: ${\mathrm{CaF}}_{2}$, ${\mathrm{SrF}}_{2}$, ${\mathrm{SrCl}}_{2}$, and ${\mathrm{LiCaAlF}}_{6}$. The excited-state absorption in the emission region of each material is similar in nature to that previously observed…
Semi-insulating polycrystalline silicon (SIPOS) are thin SiOx films (0≤x≤2), deposited by means of low pressure chemical vapor deposition on suitable substrates (silicon or sapphire). Although SIPOS has important applications in the semiconductor and solar cell technology, its physical properties which depend strongly…
In-situ x-ray flourescence detected surface EXAFS spectroscopy has been employed to elucidate the in-plane structure of copper underpotentially deposited on a clean and well ordered platinum (111) single crystal electrode. XANES and EXAFS analyses were made as function of applied potential (+0.2V, +0.1V, and 0.0V) cor…
Effects of fluid flow on the corrosion resistance of oil well materials in environments containing CO2 were studied using two experimental techniques. One method utilized weight loss measurements and a large flow loop that could attain a maximum liquid flow rate of 20 m/s. The other utilized electrochemical measuremen…
Structural properties of random propylene ethylene copolymers with low ethylene contents between 0 % and 11 mol % were investigated using mainly X-ray techniques. One of the essential issues of this paper is that a cocrystallization of the comonomer units does not take place. This is based on the following observation…
After a brief review of existing models of microsegregation in the dendritic arm spaces of binary alloys, a numerical microsegregation model based on conservative variables (to account for the solidification phase change) and a coordinate transformation (to account for coarsening) is outlined. In the context of this m…