Materials Literature
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Preliminary studies on the carbothermal reduction of sillimanite (Al2O3SiO2) powders are reported. The effects of various reaction parameters, e.g. reaction temperature (1550–1700 °C), C: Si molar ratio (4.5–9.0) in the reactant mixtures, the nature and source of carbon (carbon black or activated charcoal) and the rea…
Abstract A method for X‐ray interferometric investigation of the deformation field of crystal imperfections by means of double and triple interferometers is proposed. It is shown experimentally that by means of double and triple interferometers it is possible to detect segregation lines, displacement lines, and the Mo…
An analytical methodology is developed to model the response of unidirectional ceramic matrix composites (CMCs) under monotonic and fatigue loadings at room temperature. The analysis is presented as a first step toward analyzing the fatigue behavior of CMCs at elevated temperatures. The laminate is modeled using a mod…
For the first time, the formation of paramagnetic defect centers in AlPO 4 molecular sieves has been monitored by electron spin resonance (ESR) spectroscopy. Results from ESR measurements demonstrate that the structural defects in hydrated AlPO 4 -5 and VPI-5 molecular sieves change into paramagnetic defect centers wh…
Abstract Electron paramagnetic resonance (EPR), Optical absorption and Transport properties of (NH 4 ) 2 CuCl 4 2 H 2 O single crystals have been studied. An anisotropic g tensor was observed with gl = 2.241 and g∥ = 2.081 by EPR method. The spin orbit coupling constant is found to be 540 cm −1 . The optical absorptio…
The fluorescence quenching and complexation behaviour of tetraphenylporphyrin (TPP) have been studied using fluoresence, electronic absorption spectra and the stopped-flow technique. The second-order fluorescence quenching rate constant (kq) increases in the order Ni2+ > Co2+ > Hg2+ > Sn2+ in methanol. Both Ni2+ and C…
Abstract One of the most important applications of the population balance approach to MSMPR crystallizer modelling is the recovery of crystal nucleation and growth rates data from steady‐state crystal size distributions (RANDOLPH, LARSON). A large number of studies have confirmed that both size‐dependent (growth rate…
We have examined HCN synthesis by the ammoxidation of CH 4, C 2 H 6, and CH 4 /C 2 H 6 mixtures in air or O 2 at atmospheric pressure on α-Al 2 O 3 foam monoliths coated with 1−10 wt % Pt and on Pt−10% Rh gauzes. The HCN reaction system was found to be highly sensitive to the catalyst microstructure because we observe…
Second harmonic generation decay has been used to follow the orientational relaxation of dipolar chromophores either dissolved in (guest−host) or chemically attached to (side chain) an amorphous polymer host. The guest−host system investigated is the chromophore lophine-1 in a polyimide host and the side-chain system…
A Langmuir–Blodgett film of a platinized viologen-linked porphyrin is prepared, and steady photoinduced hydrogen evolution is observed with the porphyrin under steady-state irradiation.
ADVERTISEMENT RETURN TO ISSUEPREVAddition/CorrectionSelf-Consistent Theory of Block Copolymers with Conformational Asymmetry Vol. 26, Number 25, December 6, 1993, pp 7070−7075J. D. Vavasour and M. D. WhitmoreCite this: Macromolecules 1996, 29, 15, 5244Publication Date (Web):July 15, 1996Publication History Published o…
A series of scientific expeditions in Indonesia for collecting informations and materials concerning locally used medicinal plants and Javanese traditional medicine "jamu" have been carried out by us since 1985. This article reviews pharmacochemical investigations of nine Indonesian medicinal plants: i.e. Pongamia pin…
We discovered a novel compound expressed by R2(Fe, M)17+δ in the compositional rangc between 2-17 and 1-12. Hong-Shou Li et al. reported R3(Fe, M)29 which is stoichiometric compound with monoclinic structure. These compounds show similar X-ray diffraction patterns.In this paper, syntheses of R2(FC, M)17+δ were attempt…
Abstract Twaron fiber is spun from the polymer poly(paraphenylene terephthalamide), PPT, and has a crystallinity of 82%. Wideangle X‐ray diffraction, combined with the multipeak resolution procedure, was applied to study the changes in the structure after annealing the fiber in the temperature range of 100–675°C. The…
A marine photosynthetic bacterium Rhodopseudomonas sp. strain W-1S, accumulated polyhydroxybutyrate (PHB) to 56% of the dry cell weight under microaerobic and photoheterotrophic conditions. The addition of NaC1 and phosphate was essential for the accumulation. Acetate was the best carbon source for PHB accumulation, w…
Friction characteristics of face-seal materials have been studied using a thrust-washer (face-loaded) contact fixture, which includes a rotating carbon ring against a stationary, mating silicon carbide (SiC) ring. A computerized test machine was used to conduct the friction measurements. Two types of carbon ring mater…
Abstract The mineralogical composition of soils along a toposequence formed on Quaternary‐aged alluvium from the northeastern portion of the island of Crete, Greece, and the examination of their mineral weathering characteristics should help provide an insight into the stage of weathering and relative age of the soils…
Aluminate sodalites containing the telluride and tellurite ions have been synthesised for the first time. The structures of Sr8[AlO2]12(TeO3)2 and its reduced product Sr[AlO2]12Te2 have been determined using Rietveld refinement of powder neutron diffraction data. In Sr8[AlO2]12Te2 the anion occupies a position at the…
Abstract The concept of a regular polyhedra helix is defined and the full set of such moieties are analysed. It is found that apart from trivial cases, eight distinct RPH exist.
The effect of incorporating poly[styrene- b -(ethylene oxide)], PS- b -PEO into PS/PEO composites has been examined microscopically and dielectrically. The addition of block copolymer stabilizes the dispersion of PEO in PS and can produce composites of PEO in PS in which the PEO domain size ranges from the size of the…