Materials Literature
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Polarized Raman spectra of undoped and doped ${\mathrm{La}}_{1\ensuremath{-}x}{M}_{x}{\mathrm{MnO}}_{3}$ single crystals have been studied in the temperature range from 5 to 423 K ($M=\mathrm{Sr},$ Ca). The spectral intensity is mainly related to scattering by optical phonons at $q\ensuremath{\sim}0$ (for $x\ensuremat…
The paper is concerned with chemical vapor deposition in hot wall reactors and in particular with the interaction of homogeneous gas-phase and heterogeneous surface reactions. Based on model considerations it is shown that this interaction has a tremendous influence on the deposition chemistry and kinetics in all case…
Uptake experiments at ambient temperature of NO 2 on ethylene, acetylene and toluene soot resulted in significant amounts of HONO. The initial uptake coefficient γ0 of NO 2 on ethylene soot decreased from 0.12 to 0.03 with increasing NO 2 concentration in the range 8×10 10 to 1.4×10 13 molecule s −1 . The HONO yields…
Silica glasses with high surface area were prepared by the sol−gel method, the electrical conductivity of which was measured as a function of the content of adsorbed water. The glasses obtained by heating at 400−800 °C had specific surface areas of 700−900 m 2 /g glass and exhibited room-temperature conductivities of…
Deviations from the ideal single-file behavior in actual systems, such as zeolitic host−guest systems with a one-dimensional channel structure, may occur if (i) there is a possibility of mutual passages of the diffusants and (ii) the influence of the file boundary on the movement of the diffusants cannot be neglected.…
Diffusion barrier properties of very thin sputtered Ta and reactively sputtered TaN films used as a barrier layer between Cu and Si substrates were investigated using electrical measurement and materials analysis. The Cu/Ta/p + ‐n junction diodes with the Ta barrier of 5, 10, and 25 nm thicknesses were able to sustain…
Arrays of aligned, multiwalled carbon nanotubes were produced by catalytically pyrolyzing acetylene within the pores of an anodic aluminum oxide template. Small cobalt catalyst particles were predeposited electrochemically at the bottom of the pores. The tube walls consisted of approximately 10 carbon layers with an i…
We derive closed-form expressions for the effective index of subwavelength gratings up to the fourth and the second order for TE and TM polarization, respectively. These expressions are valid for arbitrary grating structures and are a generalization of previous results obtained for lamellar gratings with one groove pe…
Optical waveguide spectroscopy has been employed to monitor the temperature dependence of the refractive index, k = ∂n/∂T, and of the thermal (linear) expansivity, ß = (∂d/∂T) · d−1, for thin poly(methyl methacrylate) (PMMA) films of thicknesses d > 0.2 μm independently from each other. A break in the linearized slope…
The orientation of the crystal stems in diblock copolymers, where crystallization occurs within the cylindrical microdomains present in the melt mesophase, is investigated via X-ray scattering on flow-aligned specimens. A series of ethylene-b-(3-methyl-1-butene) diblocks (E/MB) is compared with an ethylene-b-(vinylcyc…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTCrystal Structure Change for the Thermochromy of N-Salicylideneanilines. The First Observation by X-ray DiffractionKeiichiro Ogawa, Yoshiro Kasahara, Yohko Ohtani, and Jun HaradaView Author Information Department of Chemistry, Graduate School of Arts and Sciences, The…
A new monomer, sodium 5,5′-carbonylbis(2-fluorobenzenesulfonate) (1), was synthesized by sulfonation of 4,4′-difluorobenzophenone (2) with fuming sulfuric acid. Poly(ether ether ketone)s containing sodium sulfonate groups were synthesized directly via aromatic nucleophilic substitution from the sodium sulfonate-functi…
This paper presents the measurement and modeling of rotational core losses in electrical steel sheets and rotating electrical machines. Novel formulations of rotational hysteresis, eddy current, and excess losses in electrical sheet steels with circular and elliptical rotating flux density vectors are reported. These…
Modification of polymer LED operating characteristics has been achieved by interposing a conducting, semiconducting, or insulating polymer layer at the interface between the indium tin oxide (ITO) electrode and the emissive polymer. The Figure shows schematically a conducting polymer interlayer (sulfonated polyaniline…
The aim of this paper is to express the effects of basic dissipative mechanisms involved in the dynamics of the magnetization field in terms of the one most commonly observed quantity: the spatial average of that field. The mechanisms may be roughly divided into direct relaxation to the lattice, and indirect relaxatio…
Models and rules for short-range interactions, cross slip and long-range interactions of dislocation segments for implementation in a 3D dislocation dynamics (3DD) model are developed. Dislocation curves of arbitrary shapes are discretized into sets of straight segments of mixed dislocations. Long-range interactions a…
For combed cotton yarns, the wider the strand spacing is in Sirospun, the better the yarn properties are in terms of tenacity, Uster hairiness, abrasion resistance, and trapped strand twist.
These spectra compare the Ti 2p core-level XPS line shape for atomically clean, stoichiometric samples of Ti, Ti2O3, and TiO2; the latter two are UHV-cleaved or fractured single crystals. The Ti0 and Ti4+ peaks of Ti metal and TiO2, respectively, exhibit the simple shapes expected for such core levels. The Ti3+ peaks…
It was noticed in the past that, to avoid physical inconsistencies, in Marcatili's lossless tapers through-flowing waves must be drastically different from standing waves. First, we reconfirm this by means of numerical results based on an extended BPM algorithm. Next, we show that this apparently surprising behavior i…
The thermal conductivity of polycrystalline magnesium oxide has been measured over the temperature range from 400 K to 1300 K using a modified guarded-hot-plate design. Three different thicknesses of specimens having 93 % of theoretical density were tested to verify the operation, accuracy, and reproducibility of our…