Materials Literature
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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…
Abstract Unter den Bedingungen der Phasen‐Transfer‐Katalyse reagieren die Pyrrol‐Derivate (I) mit dem Lösungsmittel Methylenchlorid zu den Methylen‐bis‐pyrrolen (II).
Rate coefficients for the oxidation reactions of zirconium ions with oxygen, nitric oxide, and carbon dioxide have been determined in the near-thermal energy range (0.04 to about 0.4 eV) using a selected-ion drift apparatus. The reactions are found to proceed with large rate coefficients [∼5(−10)cm3/s at 300 K]. At el…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSolubilities of various nitroanilines in water-pyridine, water-acetonitrile, and water-ethyleneglycol solventsJean Louis BrissetCite this: J. Chem. Eng. Data 1985, 30, 4, 381–383Publication Date (Print):October 1, 1985Publication History Published online1 May 2002Published i…
Diamond particles were dispersed in silicon nitride, sintered at 6 GPa and 1600°C for 30 min, and heat‐treated under vacuum at 1300°C to induce graphitization of the diamond. Improved fracture toughness values up to 7.5 MN/m 312 were achieved for these composites. Stress‐induced microcrack toughening is considered to…
Abstract Chemical preparation and crystal structure of Pb 2 Cs 3 (P 4 O 12 )(PO 3 ) 3 are described. The triclinic unit cell has the following dimensions: equation image space group is P 1 with Z = 2. The crystal structure has been solved by using 3350 unique reflexions with a final R value 0.048, The main outstanding…
Abstract The Raman spectra of pure silica core fibres revealed the presence of molecular oxygen, which may be responsible for two absorption bands, one at 0.76 and the other at 1.27 μm.
Electrolytic, chilled mirror, and aluminum oxide dielectric hygrometers were evaluated by exposing them to known moisture levels in gaseous argon. The experiments were performed over a period of several months to determine the long-term hysteresis effects which may occur under continuous operation in the range of 1 to…
Differential magnetic susceptibility data for ${\mathrm{CoCl}}_{2}$-GIC's (graphite intercalation compounds) are analyzed using the high-temperature series expansion of the classical spin model in two dimensions. On this basis, conclusive evidence for a classical two-dimensional (2D) XY model description of the magnet…
Abstract The energy loss of protons in the energy region from 40 to 350 keV is measured for (110), (100), and (111) planar channeling, for 〈110〉, 〈111〉, 〈112〉 axial channeling, and for random directions in silicon. The investigations are carried out by means of the transmission experiment using silicon targets of seve…
Shapes of cracks associated with Vickers indenter flaws in a glass‐ceramic were assessed by stepwise polishing and measuring surface traces as a function of depth. The cracks were of the Palmqvist type even at200‐N indentation load. The toad dependence of crack lengths and fracture toughness estimates were examined in…