Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
We solve a one-dimensional sandpile problem analytically in a thick flow regime when the pile evolution may be described by a set of linear equations. We demonstrate that, if an income flow is constant, a space periodicity takes place while the sandpile evolves even for a pile of only one type of particles. Hence, gra…
We explore the consequences of the excluded volume interaction of hard spheres at high densities and present a theory for excited granular materials. We first demonstrate that, in the presence of gravity, the granular density crosses over from Boltzmann to Fermi statistics, when temperature is decreased in the weak ex…
The polymorphic modifications \ensuremath{\alpha}, \ensuremath{\beta}, and $\ensuremath{\gamma}{\mathrm{Fe}}_{2}{\mathrm{WO}}_{6}$ of the iron (III) tungstate have been investigated by resistivity and electron paramagnetic resonance (EPR) measurements. The high-electrical resistivity for all phases complies with the d…
Frequency- and temperature-dependent conductivity has been studied by optical spectroscopy for perovskite titanates, which are typical three-dimensional correlated metals. Extended Drude analysis of the data indicates that only one parameter, the ${T}^{2}$ coefficient of the scattering rate, dominates the temperature…
The study of the energy-transfer processes is extended, within the conceptual framework of the crystal model, to the electric dipole-electric quadrupole and electric quadrupole-electric quadrupole interactions. The formalisms for the energy-transfer rates are deduced, applying a mixed scheme of Cartesian tensors which…
The objective of this study was to examine the reactivity of superoxide ion as an oxygen nucleophile towards biodegradable biomaterials having an aliphatic polyester structure, such as poly(D,L-Lactide) (PDLLA). The changes in molecular weights and thermal properties of PDLLA were studied as a function of the superoxi…
We present high-energy spectroscopy results on the occupied and unoccupied electronic structures of the strongly anisotropic compounds ${\mathrm{MoO}}_{3}$ and ${\mathrm{K}}_{0.3}{\mathrm{MoO}}_{3}$ near the Fermi level. X-ray photoemission reveals a close similarity of the valence-band spectra in both materials. The…
Small-angle X-ray scattering (SAXS) and differential scattering calorimetry (DSC) were used to demonstrate distinct differences in domain size, phase separation, and hydrogen bonding in a series of segmented urethaneurea elastomers prepared from isocyanate-terminated prepolymers and aromatic diamine chain extenders. T…
Atomic-layer epitaxy (ALE) processes of ZnSe on GaAs(001) have been studied using reflection high-energy electron diffraction (RHEED), total reflection-angle x-ray spectroscopy, and x-ray photoelectron spectroscopy. We have obtained direct evidence that the growing surface of ZnSe(001) changes its chemical composition…
The thermoelectric figure of merit ZT of Hg1−xCdxTe superlattices (SLs) having currents along the growth axis is computed using a realistic SL band structure and the multisubband Boltzmann equation. For a narrow well and wide barrier, a heavy C1 and higher-lying light C2 subband combine to form a (nonoptimal) carrier-…
Neutron diffraction spectra were obtained during various stages of a reversible stress-induced austenite to martensite phase transformation in superelastic NiTi. This was accomplished by neutron diffraction measurements on bulk polycrystalline NiTi samples simultaneously subjected to mechanical loading. Analysis of th…
Faraday and magneto-optical Kerr effect has been used for the investigation of the band alignment as well as of the magnetic properties of epitaxial layers of the ternary alloy system ${\mathrm{Pb}}_{1\ensuremath{-}x}{\mathrm{Eu}}_{x}\mathrm{Te}$ $(0<~x<~1)$ grown on ${\mathrm{BaF}}_{2}$ substrates. Due to the w…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis and Properties of New Soluble Polyamides Derived from 2,2'-Dimethyl- 4,4'-bis(4-carboxyphenoxy)biphenylDer-Jang Liaw, Been-Yang Liaw, Jun-Rong Chen, and Chao-Min YangView Author Information Department of Chemical Engineering, National Taiwan University of Science and…
The chemical structure and bonding of the hypermetallic Al5C and Al5C− species have been studied by photoelectron spectroscopy and ab initio calculations. Both Al5C (C2v, 2A1) and Al5C− (C2v, 1A1) are found to have planar structures that can be related to that of the planar square Al4C− by adding one Al+ ion or one Al…
The coenzyme B(12)-dependent isobutyryl coenzyme A (CoA) mutase (ICM) and methylmalonyl-CoA mutase (MCM) catalyze the isomerization of n-butyryl-CoA to isobutyryl-CoA and of methylmalonyl-CoA to succinyl-CoA, respectively. The influence that both mutases have on the conversion of n- and isobutyryl-CoA to methylmalonyl…
Resonant soft-x-ray emission spectroscopy was measured on ${\mathrm{La}}_{x}{\mathrm{Sr}}_{1\ensuremath{-}x}{\mathrm{TiO}}_{3}$ $(x=0,0.05,0.10)$ in the $\mathrm{Ti}2p$ energy region. At the Raman scattering of the ${e}_{g}$ resonance, the $d\ensuremath{-}d$ transition whose Raman shift has an energy value of about 2.…
We present tight-binding-based simulations of the scanning tunneling spectroscopic signal of different types of carbon nanotubes. Capped, finite, and connected nanotubes have been investigated. We have computed scanning tunneling spectroscopy (STS) maps of each nanotube on different parts of the systems for various ti…
We investigate the influence of tube-tube interactions in ropes of (10,10) carbon nanotubes, and find that these effects induce a pseudogap in the density of states (DOS) of the rope of width 0.1 eV at the Fermi level. In an isolated $(n,n)$ carbon nanotube there are two bands that cross in a linear fashion at the Fer…
We report observation of coherent quantum oscillations in spin-10 Fe 8 molecular clusters. The powder of magnetically oriented Fe 8 crystallites was placed inside a resonator, in a dc magnetic field perpendicular to the magnetization axis. The field dependence of the ac-susceptibility was measured up to 5 T, at 680 MH…
The structure of lamellar phases of symmetric AB diblock copolymers in a thin film is investigated. We quantitatively compare the composition profiles and profiles of individual segments in self-consistent field calculations with Monte Carlo simulations in the bond fluctuation model for chain length N=32 and χN=30. Th…