Materials Literature
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Nanocrystalline-silicon superlattices are produced by controlled recrystallization of amorphous-Si/SiO2 multilayers. The recrystallization is performed by a two-step procedure: rapid thermal annealing at 600–1000 °C, and furnace annealing at 1050 °C. Transmission electron microscopy, Raman scattering, x-ray and electr…
The engineering of functional smooth muscle (SM) tissue is critical if one hopes to successfully replace the large number of tissues containing an SM component with engineered equivalents. This study reports on the effects of SM cell (SMC) seeding and culture conditions on the cellularity and composition of SM tissues…
Liquid gas was used to produce DLC films on Cu, Al and steel substrates by DC plasma technique. The absorption in IR reflectance indicates, grown films are DLC. By deconvolution of room temperature UV-visible spectra of the films grown at 50 mtorr and 200${}^\circ$C, in addition to the spectra lines reported for CL, P…
A mean-field model of photoinduced surface reliefs in dye containing side-chain polymers is presented. It is demonstrated that photoinduced ordering of dye molecules subject to anisotropic intermolecular interactions leads to mass transport even when the intensity of the incident light is spatially uniform. Theoretica…
Nanocrystalline TiO2 has been obtained by a sol-gel process by controlling the crystal size through the water/alkoxide ratio. Raman spectra of anatase nanocrystals with average sizes of 9.5–13.4 nm are reported and the correlation between the Raman band shape (peak position and linewidth) of the main feature at 144 cm…
Polypropylene-clay hybrids (PPCH) were prepared using a maleic anhydride-modified PP oligomer (PP-MA) as a compatibilizer. PP was melt-blended with organophilic clay which was intercalated with PP-MA. In these PPCHs, the particles of silicate layers were dispersed at the nanometer level. The particles became smaller a…
Polypropylene-clay hybrids (PPCH) were prepared using a maleic anhydride-modified PP oligomer (PP-MA) as a compatibilizer. PP was melt-blended with organophilic clay which was intercalated with PP-MA. In these PPCHs, the particles of silicate layers were dispersed at the nanometer level. The particles became smaller a…
Stable liposomes were rendered pH-sensitive by complexation to a polymer that undergoes marked temperature- and pH-dependent water solubility changes. The N-isopropylacrylamide-methacrylic acid copolymer was prepared with or without octadecyl acrylate. At pH below the phase transition of the polymer, egg phosphatidylc…
Some 3d n (4 ≤ n ≤ 7) transition metal compounds exhibit a cooperative transition between a low-spin (LS) and a high-spin (HS) state. This transition is abrupt and occurs with a thermal hysteresis, which confers a memory effect on the system. The intersite interactions and thus the cooperativity are magnified in polym…
Amorphous fibres of boehmite OH—Al=O are synthesised using an electrochemical surface oxidation reaction of an amorphous Al plate in open air at room temperature. The microstructures of the samples, measured at selected periods of time of reaction, demonstrate a very rapid growth in the separated fibres with a highly…
Japan Atomic Energy Research Institute has been conducting a design study of an advanced marine reactor MRX. MRX employs a water-filled containment vessel. In a case of loss of coolant accident (LOCA), the discharge of water from the reactor vessel almost stops when the pressures of reactor vessel and containment vess…
This study was carried out to establish the reliability of ab-initio (Huzinaga, 3-21G*, STO-3G* basis sets) and pseudo-potential (LANDL2DZ basis set) quantum mechanical methods for molecules containing the Te-Se-Te group. Bond lengths and bond energies were calculated for the diatomic model compounds Se-Se, Se-Te, and…
A modified LEED/Auger diagnostic allows the measurement of the coefficient of secondary electron emission, δ, under electron bombardment. To measure currents on insulators, the system is pulsed. Problems due to charging are alleviated by alternating between pulses in which the target charges negatively (δ<1) or positi…
The reaction between molybdenum trioxide and molten potassium pyrosulfate was shown by Raman spectroscopy at 430 °C to be a 1:1 reaction. By tempering of the compound, colorless crystals could be formed. The structure was determined; crystal data: Space group = P 2 1 / c, Z = 4, a = 9.0144(3), b = 12.4540(4), c = 8.88…
The structures of potassium borate glasses and melts with 10 and 30 mol %K 2 O have been studied by the use of pulsed neutron total scattering measurement. With an increase in K 2 O content, the first peak of the experimental radial distribution function corresponding to nearest neighbor B-O correlation spread asymmet…
As part of our study program on environmental radiation levels in buildings, we have undertaken to measure the natural radioactivity, such as radium-226, thorium-232, and potassium-40 in various inorganic building materials. The specimens of their materials include cements, aggregates, concretes, asbestos cement slate…
Exciting ferrite cores in a high frequency range, the real part of the complex permeability deteriorates and the imaginary part of it has a peak after starting the deterioration. For a certain Mn-Zn ferrite material, we find that the frequency characteristics of the complex permeability depend on core size, i.e. the r…
Experimental investigations of breakdown in vacuum up to 7.6/spl times/10/sup -6/ Torr in weakly nonuniform fields with lightning impulse voltage of either polarity are reported in this paper. From the oscillograms taken for each impulse voltage application, measured results of statistical time lag, propagation of lea…
I. Techer T. Advocat E. Vemaz Commissariat ~ l'6nergie atomique, CE Valrh6 Marcoule/DCC/ DRRV/SCD, BP 171, 30207 Bagnols sur Cbze, France J. R. Lancelot J. M. Liotard UMR 5566, laboratoire de g6ochimie isotopique cc 066, 5 place E. Bataillon, 34095 Montpellier Cedex 5, France With the concept of a geological repositor…
Abstract A new method for preparing thin sections of wet snow is described. Samples are flash-frozen to immobilise the liquid water content (LWC). Next, the pore space is filled with ester, and the entire sample is frozen to a solid, sliceable block, Micrographs of slices are obtained using transmitted and specular il…