Materials Literature
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Scanning tunneling microscopy observations on epitaxial Cu/Ru(0001) show the relaxation of (tensile) lattice strain to occur in four different stages with increasing film thickness, from pseudomorphic to unilaterally contracted to (quasi-)isotropically contracted film structures, with decreasing lattice strain and inc…
A series of boron-doped polycrystalline diamond films grown by direct current and microwave plasma deposition was studied with Raman and infrared (IR) absorption spectroscopy. A Fano line shape is observed in the Raman spectra for films with a boron concentration in a narrow range near 1021 cm−3. The appearance of the…
Polylactic acid (PLA) nanoparticles containing indomethacin were prepared by interfacial deposition of PLA following acetone displacement from a dichloromethane acetone solution towards an aqueous phase. The manufacturing process was carried out according to a factorial experimental design combined with a multiple reg…
The interaction of apocalmodulin (apoCaM) with a peptide (Neurop) based on the primary sequence of the calmodulin-binding domain of neuromodulin has been studied by nuclear magnetic resonance (NMR) methods. The NMR spectra of both apocalmodulin and its 1:1 complex with the Neurop peptide have been assigned by triple r…
A wide variety of two- and three-dimensional physical-chemical systems display domain patterns in equilibrium. The phenomenology of these patterns, and of the shapes of their constituent domains, is reviewed here from a point of view that interprets these patterns as a manifestation of modulated phases. These phases a…
An algorithm for first-principles electronic structure calculations having a computational cost which scales linearly with the system size is presented. Our method exploits the real-space localization of the density matrix, and in this respect it is related to the technique of Li, Nunes and Vanderbilt. The density mat…
Abstract ChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 100 leading journals. To access a ChemInform Abstract of an article which was published elsewhere, please select a “Full Text” option. The original article is trackable via the “References” opt…
We use realistic pseudopotentials and a plane-wave basis to study the electronic structure of non-periodic, three-dimensional, 2000-atom (AlAs)_n/(GaAs)_m (001) superlattices, where the individual layer thicknesses n,m = {1,2,3} are randomly selected. We find that while the band gap of the equivalent (n = m = 2) order…
Abstract Natural rubber is reinforced with untreated coir fiber chopped to different lengths, viz., 6, 10, and 14 mm. Mixes were also prepared using 10 mm‐long coir fibers treated with 5% sodium hydroxide solution for different time intervals, viz., 4, 24, 48, and 72 h. These composites were vulcanized at 150°C. The v…
The use of a stable glow discharge for the synthesis of carbon nanotubes is reported. Bundles of buckytubes are synthesized with remarkably large diameters (up to 200 μm). The bundles are evenly spaced, parallel, and occupy the entire central region of the deposited rod. High resolution electron microscopy (HREM) imag…
We report a novel method for fullerene formation during diamond synthesis via a hot filament, chemical vapor deposition (CVD) procedure. The fullerenes occur in the soot that forms as a by-product on the edges and rear surface of the substrate holder, where the temperature does not favor diamond deposition. Mass spect…
Change in the distribution state of Mn2+ before and after annealing was examined by electron spin resonance (ESR) in order to elucidate the electroluminescence properties of Mn-doped ZnS modified by Cu. Formation of Mn2+ ion pairs and clusters, as determined from the hyperfine structure of ESR profiles, was revealed t…
Photoconductive properties of diamond optical switch made by chemical vapor deposition method were investigated. A new configuration of the diamond gap was proposed to reduce the surface leakage current and avoid surface flashover. This technology made it possible to apply static high electric field up to 2×106 V/cm.…
We report in this letter the observation of visible photoluminescence (PL) at room temperature from hydrogenated nanocrystalline silicon (nc-Si:H)/amorphous silicon (a-Si:H) multilayers (MLs) prepared in a plasma enhanced chemical vapor deposition system without any postprocessing. The PL peak wavelength can be contro…
Cooling (Pb,La)(Zr,Ti)O3 films from their pulsed laser deposition temperature in a reducing ambient yields a voltage offset in the polarization–voltage characteristics. Reversing the as-processed polarization at 120 °C nearly removes the offset. By reversing the polarization at room temperature and either heating the…
We have studied the ${\ensuremath{\pi}}^{*}$ and ${\ensuremath{\sigma}}^{*}$ threshold structures in the C $1s$ x-ray absorption spectrum of graphite using core level autoionization spectroscopy. We confirm that the ${\ensuremath{\sigma}}^{*}$ threshold feature is an exciton. We find that the prominent ${\ensuremath{\…
If the temperature of a glass is continuously increased nucleation can start only after the nascent nuclei are able to escape the advancing critical size. In case the starting temperature T° exceeds the temperature of the maximum nucleation rate, corrections to the steady-state values of the number of nucleated partic…
The energy transfer from the long-lived states N2(W 3Δu, A 3Σ+u) to the radiating state N2(B 3Πg) in collisions with N2(X 1Σ+g) was studied under single collision conditions, employing a molecular beam/target gas cell arrangement. By means of using the isotopic species 14N2 in the metastable reactant beam and 15N2 in…
鉄筋コンクリート床版と剛飛来物を用いて衝撃実験を行った. 実験では, 床版に関しては板厚, コンクリート強度, また, 剛飛来物については先端形状をパラメーターとした. これらの実験結果をもとに, 飛来物の裏面剥離や貫通を防ぐために必要となる鉄筋コンクリート床版の板厚を求める設計評価を提案するとともに, 他の実験結果と比較し, その適用性を検証した.
Lattice melting is an unusual effect that occurs at the continuous structural phase transition belonging to the m = 2 universality class. Renormalization group theoretical studies have shown that the mean-squared atomic displacements are expected to diverge at this transition, much as they do in a conventional liquid–…