David Bienvenue、Danuta Gilner、Ryan S. Davis 等 5 位作者2003-08-21Biochemistry
The catalytic and structural properties of divalent metal ion cofactor binding sites in the dapE-encoded N-succinyl-L,L-diaminopimelic acid desuccinylase (DapE) from Haemophilus influenzae were investigated. Co(II)-substituted DapE enzyme was 25% more active than the Zn(II)-loaded form of the enzyme. Interestingly, Mn…
Enzyme Structure and FunctionPorphyrin Metabolism and DisordersPeptidase Inhibition and Analysis
A. B. Harris、Taner Yildirim、Amnon Aharony 等 5 位作者2003-08-21Physical Review Letters
The Kugel-Khomskii Hamiltonian for cubic titanates describes spin and orbital superexchange interactions between d(1) ions having threefold degenerate t(2g) orbitals. Since orbitals do not couple along "inactive" axes, perpendicular to the orbital planes, the total number of electrons in |alpha> orbitals in any such p…
Magnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter PhysicsAtomic and Subatomic Physics Research
Jin Pyo Hong、Sung Bok Lee、Young Woo Jung 等 9 位作者2003-08-21Applied Physics Letters
Half-metallic Fe3O4 films were prepared at room temperature using a rf sputtering system specially integrated with an external rf source. Primary emphasis was placed on obtaining a large amount of active oxygen radicals through an external electrode for efficient deposition. The insertion of an external electrode was…
Magnetic properties of thin filmsMagnetic Properties and Synthesis of FerritesIron oxide chemistry and applications
Yulan Li、Samrat Choudhury、Zi‐Kui Liu 等 4 位作者2003-08-21Applied Physics Letters
The phase diagram of a PbZr1−xTixO3 (PZT) film constrained by a much thicker substrate was studied using both thermodynamic calculations and phase-field approach. It was found that the ferroelectric transition temperature is increased with substrate constraint regardless of the nature of the constraint, i.e., tensile…
Ferroelectric and Piezoelectric MaterialsSolidification and crystal growth phenomenaAcoustic Wave Resonator Technologies
A. Y. Polyakov、N. B. Smirnov、A. V. Govorkov 等 12 位作者2003-08-21Journal of Applied Physics
Electrical and optical properties of undoped n-ZnO crystals implanted with 50 keV protons with doses from 5×1013 to 5×1015 cm−2 are reported. Proton implantation leads to a decrease of the carrier concentration in the near-surface region, but at the end of the proton range shallow donors are observed whose concentrati…
ZnO doping and propertiesCopper-based nanomaterials and applicationsGa2O3 and related materials
Amparo Galindo、Andrew J. Haslam、Szabolcs Varga 等 7 位作者2003-08-21The Journal of Chemical Physics
The phase behavior of a binary mixture of rodlike and disclike hard molecules is studied using Monte Carlo NVT (constant number of particles N, volume V, and temperature T) computer simulation. The rods are modeled as hard spherocylinders of aspect ratio LHSC/DHSC=5, and the discs as hard cut spheres of aspect ratio L…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesSurfactants and Colloidal Systems
A. Kellou、N. Fenineche、Thierry Grosdidier 等 5 位作者2003-08-21Journal of Applied Physics
We present quantum mechanical calculations of structural, electronic, and magnetic properties of X2AlX′ (X=Fe, Co, Ni; X′=Ti, Cr) Heusler alloys within the generalized gradient approximation. Structural properties, magnetic moments, and stable ground states are well described by the present method and are in good agre…
Boron and Carbon Nanomaterials ResearchMXene and MAX Phase MaterialsHeusler alloys: electronic and magnetic properties
Christophe Detavernier、S. M. Rossnagel、Cevdet Noyan 等 6 位作者2003-08-21Journal of Applied Physics
We studied the energetics and kinetics of microstructural evolution in copper films by estimating the magnitude of various possible driving forces for microstructural change that can be present in the as-deposited film. A driving force of at least 100 J/cm3 is required to account for the speed at which the grain bound…
Microstructure and mechanical propertiesCopper Interconnects and ReliabilityCopper-based nanomaterials and applications
Yongting Ma、BOMING YU、Duanming Zhang 等 4 位作者2003-08-21Journal of Physics D Applied Physics
A new model, the self-similarity model, for effective thermal conductivity of porous media is proposed based on the thermal–electrical analogy technique and on statistical self-similarity of porous media. The proposed thermal conductivity model is expressed as a function of porosity (related to stage n of Sierpinski c…
Heat Transfer and OptimizationThermal properties of materialsComposite Material Mechanics
E. De la Rosa-Cruz、L.A. Dı́az-Torres、P. Salas 等 9 位作者2003-08-21Journal of Applied Physics
The photoluminescence and crystalline structure characterization of undoped and several samarium doped ZrO2 samples are reported. Strong fluorescence emission produced by the transitions G5/24→6H5/2,7/2,9/2 of Sm3+ was obtained by the excitation of the host at 320 nm. The energy transfer process from the host to the s…
Luminescence Properties of Advanced MaterialsCatalytic Processes in Materials ScienceGlass properties and applications
A. Grill、V. Patel、Kenneth P. Rodbell 等 8 位作者2003-08-21Journal of Applied Physics
The low dielectric constant (k) of plasma enhanced chemical vapor deposited SiCOH films has been attributed to porosity in the films. We have shown previously that the dielectric constant of such materials can be extended from the typical k values of 2.7–2.9 to ultralow-k values of k=2.0. The reduction in the dielectr…
Semiconductor materials and devicesCopper Interconnects and ReliabilityMuon and positron interactions and applications
Joaquín C. Garcı́a-Martı́nez、Robert W. J. Scott、Richard M. Crooks2003-08-21Journal of the American Chemical Society
We describe a strategy for extracting nearly size-monodisperse, 1.7-nm-diameter Pd nanoparticles from within dendrimer hosts. The approach involves two steps. First, an aqueous solution of dendrimer-encapsulated Pd nanoparticles is prepared, followed by the addition of a toluene solution containing an n-alkanethiol. W…
Gold and Silver Nanoparticles Synthesis and ApplicationsAdvanced biosensing and bioanalysis techniquesDendrimers and Hyperbranched Polymers
Yukio TOMITA、Tetsuya Kodama2003-08-21Journal of Applied Physics
The dynamics of a laser-induced cavitation bubble near a composite surface, consisting of either a thin rigid plate glued on a foam rubber (composite surface A) or a deformable rubber plate glued on a foam rubber (composite surface B), was investigated experimentally with high-speed photography. To understand the inte…
Ultrasound and Cavitation PhenomenaNuclear Physics and Applications
Kazuo Sakurai、Yeonhwan Jeong、Kazuya Koumoto 等 9 位作者2003-08-21Langmuir
Small-angle X-ray scattering (SAXS) from an organogel system prepared from methyl 4,6- O -benzylidene-α- d -mannopyranoside and p -xylene was carried out with a synchrotron X-ray source at SPring-8, which revealed that hexagonally packed fibrils are formed in the gel state. The spacing between the fibrils can be evalu…
Supramolecular Self-Assembly in MaterialsFood Chemistry and Fat AnalysisPolydiacetylene-based materials and applications
P. Etchegoin、L. F. Cohen、H. Hartigan 等 6 位作者2003-08-21The Journal of Chemical Physics
Several aspects of the electromagnetic contribution to surface enhanced Raman scattering (SERS) are revisited and analyzed in terms of known concepts and ideas in the field of photonic crystals. A qualitative understanding of some reported SERS phenomena can be achieved by this analysis of the complex energy distribut…
Gold and Silver Nanoparticles Synthesis and ApplicationsPlasmonic and Surface Plasmon ResearchPhotonic Crystals and Applications
Veng Cheong Lo2003-08-21Journal of Applied Physics
The thickness effect in ferroelectric thin films has been theoretically investigated using the Landau–Khalatnikov theory. Ferroelectric properties such as the hysteresis loop, and its associated coercive field and the remanent polarization of various film thicknesses have been numerically simulated. In this simulation…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesFerroelectric and Negative Capacitance Devices
Goo‐Hwan Jeong、Amir A. Farajian、Rikizo Hatakeyama 等 8 位作者2003-08-21Physical review. B, Condensed matter
Using an approach different from the conventional vapor doping methods, Cs positive ions in a magnetized-plasma column are irradiated upon a negatively biased substrate which is covered with dispersed single-walled carbon nanotubes (SWNTs). The Cs ions are evidently observed inside SWNTs by the Z-contrast method in sc…
Carbon Nanotubes in CompositesDiamond and Carbon-based Materials ResearchIon-surface interactions and analysis
Hongyu Zhang、Yu Fu、Dong Wang 等 6 位作者2003-08-21Langmuir
We reported a way to fabricate microporous films by post-base treatment of hydrogen-bonding-directed multilayer films of poly(4-vinylpyridine) (PVP) and carboxyl-terminated polyether dendrimer (DEN−COOH). The PVP/DEN−COOH multilayer film was fabricated by layer-by-layer assembly of PVP and DEN−COOH from a methanol sol…
Fuel Cells and Related MaterialsPolymer Surface Interaction StudiesDendrimers and Hyperbranched Polymers
Aaron K. Neufeld、Ian C. Madsen、Alan M. Bond 等 4 位作者2003-08-21Chemistry of Materials
The origins of extensive solid−solid-state interconversions that accompany the electrochemistry of microparticles of tetracyanoquinodimethane (TCNQ) and semiconducting CuTCNQ (phases I and II) adhered to glassy carbon (GC) electrodes, in contact with CuSO 4(aq) electrolyte, have been identified. Ex situ analyses with…
Molecular Junctions and NanostructuresOrganic and Molecular Conductors ResearchElectronic and Structural Properties of Oxides
Shin Tsunekawa、Jian-Tao Wang、Yoshiyuki Kawazoe 等 4 位作者2003-08-21Journal of Applied Physics
Blueshifts in the ultraviolet absorption spectra have been observed in cerium oxide nanocrystallites. The mechanism of the absorption is a charge-transfer optical transition. The relationships among the blueshift, valence state of cerium ions, and the particle size are formulated. The blueshifts are well explained for…
Luminescence Properties of Advanced MaterialsCatalytic Processes in Materials ScienceQuantum Dots Synthesis And Properties