Materials Literature
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The frequency-dependent conductivity of glasses is explained in a treatment spanning the range of frequencies, 0< omega < nu ph approximately=10 12 Hz. A large spread of individual relaxation times is assumed. The connection between low frequency AC conduction and DC conduction is their common origin in non-local rela…
It is found that the TiO2 ultrafine particles (UFP) coated with a layer of stearic acid radicals had a significant red shift of their absorption band edge and clear photoluminescence at room temperature (RT), which are in contrast with that of bulk TiO2 and naked TiO2 UFP. It was concluded that these results are relat…
Two 2D quasiperiodic tilings with generalized tenfold symmetry are derived from the lattice A 4 R , the reciprocal of the root lattice A 4 . Both tilings are built from four tiles, triangles in one case, rhombi and hexagons in the other. After a brief description of the tilings and their structures, the authors introd…
ABSTRACT Pertamina/MAXUS Southeast Sumatra Petroleum, Inc. is the largest offshore oil producer in Indonesia. CaCO3 and CaSO4 scaling in and around the submersible pumps of Pertamina/MAXUS' Farida/Zelda reservoir wells led to premature pump failures and costly workovers to bring the wells back into production. Twenty-…
Abstract The mechanical properties such as elastic modulus and stress‐relaxation and spin‐spin relaxation time T 2 from pulse NMR were measured for surface‐oxidized carbon‐black‐filled natural rubber. The extent of reinforcement increased with CB volume percent in the range of 0–30%. At a given CB percent, this quanti…
Abstract Novel 2,2′,6,6′‐tetrabromo‐3,3′,5,5′‐tetramethyl‐4,4′‐biphenol (TBTMBP), and its epoxy derivatives, were synthesized to incorporate the stable meta‐brominated phenol moiety into epoxy resin systems. In electronic encapsulation and laminate applications, epoxy systems derived from TBTMBP have exhibited superio…
Resonance between beams of x-ray waves and electronic transitions from bound atomic orbitals leads to a phenomenon known as anomalous scattering. This effect can be exploited in x-ray crystallographic studies on biological macromolecules by making diffraction measurements at selected wavelengths associated with a part…
A crystal-chemical study of high-aluminium titanites , where X Al =Al/(Al+Ti+Fe 3+ )≥0.25, has been made using single-crystal X-ray diffractometry on four samples from three different rock-types and localities. The first refinement of a natural pure CaTiOSiO 4 titanite in the P2 1 /a space group is also presented. All…
The process of deformation development in a polycrystal with pain interaction is modelled in frames of flat two-dimensional elastic-plastic flow of the media with structure. The processes of a possible fragmentation and a grain boundary segregation influence on the plastic deformations development are considered. The…
The mechanical behaviour of deplated uranium, uranium with molybdenum, niobium, titanium and rhenium was investigated under high strain rates. The Hopkinson split pressure bar was used. The spallation of these materials was also studied. The correlation of the spall strength, [MATH], with flow properties was found.
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…
A perforated spinning disc ozone contactor is described with reference to its use as an absorber with simultaneous chemical reaction. Greatly enhanced mass transfer coefficients kL are measured whilst simultaneously maintaining low ozone loss. Comparisons of kL and volumetric coefficient, kL a values, are made with mo…
Impacts of high speed soft projectiles on finite and "semi-infinite" brittle blocks are described. Penetration is accompanied by projectile erosion and by the comminution and ejection of fine debris from a crater, the kinetic energy of this debris accounting for over 50% of the projectile impact kinetic energy. The co…
Abstract Thermal decomposition of tetraamminecopper(II) nitrate and bis(ethylenediamine)copper(II) nitrate has been studied using TG, DTG, and DTA. The kinetic parameters for the thermal deamination of the former were evaluated. The thermal decomposition of bis(ethylenediamine)copper(II) nitrate involves the concurren…
Results are presented of ballistic impacts on a range of laminated and homogeneous metal targets. It is demonstrated that higher ballistic limits are achievable in laminated targets than in homogeneous targets for cases where the homogeneous target fails by a low energy mechanism, provided that the laminate has suffic…
Abstract Nickel complexes of bidentate heterocyclic amines such as 2,2′-bipyridine and 1,10-phenanthroline have been found to be active catalysts for the epoxidation of olefins with hypochlorite as terminal oxidant. Nickel complex of 1-methylimidazole which is monodentate ligand also indicated epoxidation ability.
Abstract Inappropriate combinations of moisture, alloy and mercury can accelerate corrosion and form explosive compounds. Are there ways of preventing these potential hazards?
Abstract For the first time self‐consistent band‐structure calculations of TlI single crystals (space group O ) are performed using nonlocal pseudopotentials. The method is described briefly. The contributions of the different band states to the charge density distributions are estimated. Correlations between the band…
We describe a phenomenological model which accounts for the mechanical response of glass to intense impulsive loading. An important aspect of this response is the dilatancy accompanying fracture. We have also conducted a number of experiments with 38.1-mm diameter precision shaped charges to establish the performance…
The effects of shock prestrain on the mechanical behavior, microstructure, and substructure of annealed tantalum have been examined. The test material was shocked to 15 GPa for 1 µs and soft-recovered such that deformation that occurred during this procedure was predominantly due to the shock loading. Mechanical chara…