Materials Literature
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The switching reaction of conductive polymers can be described as two simultaneous steps: the transfer of an electron to or from the conductive polymer and the diffusion of the counterion out of or into the polymer. The charge‐transfer‐controlled switching reaction is modeled by assuming it to be first order reversibl…
A laser Doppler interferometric method using synchronous detection to measure the magnetostriction of soft magnetic films is described. The instrument measures 2 AA magnetostrictive deflections of Permalloy films on 500 mu m silicon substrates. Saturation magnetostriction of 10/sup -9/ can be measured for 1000 nm film…
A new vector isotropic Preisach-type model of hysteresis is introduced, and the identification problem for this model is posed. A mathematical machinery for the solution of the identification problem by using scalar and rotational experimental data is presented.>
Ferrimagnetic resonance (FMR) linewidths have been measured at X-band frequencies (11 GHz) from 77 K to 400 K in single crystal nickel ferrites with composition Ni/sub x/Fe/sub 3-x/O/sub 4/ with x=0.9, 1.0, 1.2. Measurements have been carried out by means of an automatic technique based on a modified short-circuit SMA…
Simple shearing flow of a ‘‘dry,’’ perfectly ordered, three-dimensional foam composed of planar films is considered. The undeformed spatially periodic cell structure is formed by regular tetrakaidecahedra, which have six square surfaces and eight regular hexagonal surfaces. The elastic–plastic response of the foam is…
A renormalization method is proposed to analyze the electronic band structure of disordered Fibonacci chains. The perfect (quasiperiodic) chain is contemplated as a particular case. Both bond and on-site problems are considered. The method is computationally efficient and suitable to deal with large chains in real spa…
Backbone 1H, 13C, and 15N NMR assignments were obtained for the complex of chicken muscle adenylate kinase (AK) with its bisubstrate analog, MgAP5A [magnesium P1,P5-bis(5'-adenosyl)-pentaphosphate]. The assignments were used to elucidate the secondary structures and the enzyme-MgAP5A interactions. The work involves tw…
Rapid cell size reduction is reported in cultures of Asterionella formosa Hass. and in samples from natural populations. Available evidence suggests that this phenomenon may be directly related to nutrient supply (Si-limitation in the presence of excess P) and is not simply a result of culture conditions or a teratolo…
Abstract Viologen compounds are known as materials suitable for electrochromic displays based on the electrochemical color change. INDO /S, PM3 and MNDOC calculations have been carried out on methylviologen and p ‐cyanophenylviologen in order to interpret the spectral changes in the visible region upon electrochemical…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCatalytic behavior of macroporous resins in catalytic processes with water production. Activation and inhibition effects in the kinetics of the self-condensation of cyclohexanoneJose M. Aragon, Jesus M. R. Vegas, and Luis G. JodraCite this: Ind. Eng. Chem. Res. 1993, 32, 11,…
Polarizing microscopy and optical-activity measurements are used to determine the phase diagram for the blue phases of chiral-racemic mixtures of terephthaloyloxy-bis-4-(2'-methylbutyl) benzoate. Contrary to an earlier report, it is the second blue phase (BP II) rather than the first blue phase (BP I) that is not stab…
Abstract The reduction of the emeraldine base form of polyaniline (PEM) by N , N ‐diethylhydroxylamine, sodium tetrahydroborate, sodium dithionite, and hydrazine monohydrate proceeds smoothly at room temperature to give the leucoemeraldine base form of polyaniline (PLM). The reduction of PEM to PLM with these reducing…
The DC field and pressure dependencies of the magnetic induction (B) and magnetostrictive strain ( lambda ) have been measured at room temperature in Terfenol-D (Tb/sub 0.3/Dy/sub 0.7/Fe/sub 1.95/) and in the compound Tb/sub 0.3/Dy/sub 0.7/(Fe/sub 0.9/ Al/sub 0.1/)/sub 1.95/. From these data the static differential pe…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTObservation of intermediate cuprous chloride species during the anodic dissolution of copper using atomic force microscopyJack Y. Josefowicz, Like Xie, and Gregory C. FarringtonCite this: J. Phys. Chem. 1993, 97, 46, 11995–11998Publication Date (Print):November 1, 1993Public…
The electrochemical behavior of sensitized, carburized, and mill-annealed alloy 600 (UNS N06600) was studied in hydrogenated, aerated, and high-temperature (250°C to 350°C) dilute aqueous solutions. In high-temperature water at high anodic potentials, the current density (CD) from carbide dissolution was higher than C…
The trend of increasing pattern data volume, together with decreasing critical dimensions, causes correction of proximity effect to be continually more time consuming and expensive. A tradeoff exists between speed and accuracy. A given correction method may be judged efficient if the direct computational overhead need…
A mechanism is proposed to explain electromigration-enhanced precipitate coarsening in Al-Cu alloy interconnects. The interface between the α-phase matrix and a θ-phase Al2Cu precipitate is incoherent, along which both Al and Cu atoms diffuse under an applied electric field. Depending on the relative mobility of Al an…
An amorphous sediment of charged colloidal particles in a nonaqueous solvent was prepared by centrifugation. The evolution of sediment height and volume fraction profile to equilibrium were studied with light scattering. A simple sedimentation–diffusion equation allows the experimental data to be modeled quantitativel…
Technical Briefs Shrinkage Formation During the Solidification Process in an Open Rectangular Cavity C.-J. Kim, C.-J. Kim Department of Mechanical Engineering, Seoul National University, Seoul 151-742, Korea Search for other works by this author on: This Site PubMed Google Scholar S. T. Ro S. T. Ro Department of Mecha…
The lacE and lacG genes from Streptococcus mutans have been isolated and characterized, and their nucleotide sequence has been determined. The lacE gene encodes the lactose-specific Enzyme II component of the phosphoenolpyruvate-dependent phosphotransferase system (PTS). The lacG gene encodes the phospho-beta-galactos…