Materials Literature
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The size distribution of nodules on the surface of polypropylene films crystallized from the glass and subsequently annealed was studied. The origin of the nodule was the crystallite produced by the growth of many nuclei which were generated on crystallization from the glass and survived on annealing. The surviving nu…
is species-dependent.
The near-edge structure of the 2p absorption edges of the complete series of the 3d transition metals has been investigated by high-resolution electron-energy-loss spectroscopy. Structures in the spectra were observed that could not be resolved in previous studies. The data are compared with single-particle calculatio…
A theory is presented for the x-ray absorption spectra of materials characterized by bandwidths which are somewhat larger than the (quasiatomic) electron correlation energies. Assuming that an empty-band approximation is appropriate for nearly empty bands we show that the problem is much akin to the well-known Coulomb…
We introduce a ''generalized dual method'' for generating quasicrystal structures with arbitrary orientational symmetry in two and three dimensions.Received 22 August 1985DOI:https://doi.org/10.1103/PhysRevB.32.5547©1985 American Physical Society
A new method for obtaining surface-conductive polymer systems, related to the reticulate doping technique, is presented. The surface layer of a non-conductive macromolecular material doped with 0.2-1.0 wt.% of a conductive charge-transfer complex is treated with solvent vapour to induce precipitation of the initially…
The breakdown voltage in diluted SF 6 was studied at elevated temperatures up to 4000K. The measurements were carried out in a diaphragm shock tube behind the reflected shock wave. The temperature dependence of the electric strength of pure and diluted SF 6 may be described by two factors E c =E c0 ( rho / rho 0 ) chi…
The anchoring energy at the interface between the nematic liquid crystal 4-$n$-pentyl-4\ensuremath{'}-cyanobiphenyl (5CB) and a glass plate treated by oblique evaporation of SiO is studied by measurement of the torque exerted on the surface by the nematic subject to an orienting magnetic field. The anchoring energy is…
The AC conductivity sigma ( omega ) and dielectric constant epsilon ' of lithium niobate single crystals have been measured along the ferroelectric c-axis in the temperature range 77-700K and in the frequency region 0.1-100 kHz. At low temperatures, below 400K, the AC conductivity can be expressed as sigma ( omega )=A…
The photoelectron spectroscopic binding energies of Se 3d 5/2 , O 1s, and Cl 2p 3/2 or Re 4f 7/2 have been measured in tetralmethyltetraselenafulvalenium (TMTSF) perchlorate and perrhenate, tetrabutylammonium perchlorate and perrhenate, and potassium perchlorate and perrhenate. It has been found that the binding energ…
Abstract A statistical theory of a two-phase material consisting of a brittle matrix with a dispersion of tougher second-phase particles is developed. In this material, failure does not occur immediately a microfracture is initiated at a flaw in the matrix. Stable cracks spanning the second-phase particles are possibl…
A 2.7 angstrom resolution x-ray diffraction analysis of a trypsin-modified form of the Escherichia coli elongation factor Tu reveals that the GDP-binding domain has a structure similar to that of other nucleotide-binding proteins. The GDP ligand is located at the COOH-terminal end of the beta sheet and is linked to th…
The compound EuAl3B4O12 shows thermally activated energy migration among the 5D0 excited level. In NaEuTiO4 this migration reduces to two-dimensional, down to the lowest temperatures, whereas in EuMgB5O10 one-dimensional migration is observed. For short distances and low temperatures the Eu3+-Eu3+ transfer occurs by e…
Abstract The surface charge of poly(vinylidene fluoride) films, which were magnetically treated at different temperatures, was measured using an improved method described by Sessler. Changes of the charge densities at both surfaces of the sample were studied in dependence on the magnetic field strength, temperature an…
The Gd3+ fluorescence has been studied in Li6Gd (BO3)3. Energy migration among Gd3+ and trapping by impurities at high temperature and perturbed Gd3+ ions at low temperature are observed. The cross-over from a fast diffusion regime to a diffusion-limited regime at low temperature is attributed to the quasi one-dimensi…
This paper summarizes the results of numerous investigations on the structure, surface properties and flotation behaviour of chrysocolla. Until the late sixties, chrysocolla was considered to be a hydrated copper silicate without fixed mineral composition. Recent articles, however, have revealed that chrysocolla is a…
Deformation twins have been observed in the intermetallic compound Cu2Sb. The theory of Bevis and Crocker (1968) has been applied to calculate, using a computer program, possible twinning modes in the tetragonal lattice of Cu2Sb. Twins in five separate crystals have been studied by two-surface methods in order to esti…
The platinum on silica catalyst designated EUROPT-1 has recently become available as a standard reference catalyst for the scientific communities in academy and industry. The material, which was manufactured by Johnson Matthey, has been characterised by the Council of Europe’s Research Group on Catalysis, and the full…
Article The crystal structure of jaskolskiite, Cux Pb2+X (Sb, Bi)2-x S5(x ≈ 0.2), a member of the meneghinite homologous series was published on October 1, 1985 in the journal Zeitschrift für Kristallographie - Crystalline Materials (volume 171, issue 1-4).
The reactivity effects of the initial fuel and clad motion during unprotected loss-of-flow accidents (ULOFs) strongly influence the accident progression in liquid-metal fast breeder reactors. To study these phenomena, a series of in-pile experiments (the STAR experiments) is being performed in which clad motion and fu…