Materials Literature
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Dynamic behavior of Brownian particles close to a wall is studied by photon correlation from an evanescent wave with variable penetration depth. Surface correlation spectra strongly differ from the bulk measurements and are completely interpreted in terms of the combined wall's mirror effect and evanescent-wave geomet…
We present a synchrotron-x-ray study of the smectic-C (${\mathrm{S}}_{\mathrm{C}}$) and smectic-I (${\mathrm{S}}_{\mathrm{I}}$) phase in a single-domain freely suspended film. Weak bond-orientational order in the ${\mathrm{S}}_{\mathrm{C}}$ phase evolves continuously into the ${\mathrm{S}}_{\mathrm{I}}$ phase so that…
We report x-ray reflectivity measurements on the free surface of dodecylcyanobiphenyl (12CB) at the isotropic to smectic-A phase transition. At about 10?deC above ${\mathrm{T}}_{\mathrm{IA}}$, smectic-A-like ordering develops at the surface while the bulk phase remains isotropic. The angular dependence of the specular…
The coefficient of thermal expansion (CTE) of a hot pressed Ta16W18O94 which was produced from Ta2O5 and WO3 powders was found to be −1.52×10−6 K−1 in the temperature range 180–330 K. Using the Ta16W18O94 and Super Invar powders, 50:50 volume percent metal-ceramic composites were made by the powder metallurgy techniqu…
Abstract The corrosion behaviour of tin in stagnant mono‐, di‐ and trichloroacetic acids solutions in the pH range 1–6 and at concentrations 4.0 to 5 × 10 −4 M was investigated. The results indicate behaviour that is generally the same but there is some dependence on the acid concentration and the pH value. In 4.0 to…
(1986). A Universal Computer Model for the Engineering of Weft-knitted Fabrics. The Journal of The Textile Institute: Vol. 77, No. 4, pp. 288-294.
The current densities of positive and negative ions i₊ and i-₋ in the back-discharge field of an electrostatic precipitator (ESP) are measured with a bipolar current probe. The ratio i₊/i- rises with increasing total current density i (= i₊ + i₋) in the streamer-mode back discharge, but it remains almost constant (10-…
The low temperature phase diagram of the (TMTTF)2(SbF6)1-x(AsF6)x salts is deduced from magnetic susceptibility and antiferromagnetic resonance measurements. This phase diagram is discussed introducing a very simple model.
Structural features determine the stability of polyurethanes. Polyether based polyurethanes have excellent hydrolytic stability but are sensitive to thermooxidative and UV-degradation. In contrast, polyester based polyure thanes are relatively stable toward thermooxidative degradation but have poor hydrolytic stabilit…
The directional mean square amplitudes of vibration and associated Debye temperatures of hexagonal Dy, Gd, Lu and Y have been obtained from X-ray intensities. The integrated intensities have been measured with a Philips PW 1051 powder diffractometer fitted with a proportional counter using CuK sub z radiation at room…
For providing background information on the liquid metal cooling of fusion reactors, the MHD effects on heat transfer of flowing lithium was experimentally studied with an emphasis on temperature fluctuations. The test section was constituted of a 15.8 mm I.D., 1.65 mm thick, 316-SS tubing and a 7.6 mm O.D. heater pin…
The history and the future of backing materials in mica-paper based insulations is examined in this article presented at the 5th BEAMA Conference.
Abstract Binary and ternary cation exchange experiments were performed with Na + , Ca 2+ , and Mg 2+ on Silver Hill illite and on a soil illite suspended in 50 mol m −3 perchlorate at pH 7. The binary experiments indicated no preference for Ca over Mg on the specimen illite, but selectivity for bivalent cations over N…
Abstract This is the first of a three‐part paper investigating the feasibility of processing polyurethane/polyester Interpenetrating Polymer Networks (IPN) by Reaction Injection Molding (RIM). The fundamental mixing process is discussed. Various approaches reported to analyze mixing are also critically reviewed. Good…
Advanced-level physics (Nuffield) investigations consist of short experimental projects which are carried out by students in the second year of the course. Each student selects a topic for study, either independently or with some advice from a teacher, and then, during a prescribed period, carries out experimental wor…
Stacking-fault tetrahedra have been observed in copper alloyed with zinc by diffusion-induced grain boundary migration. This implies that vacancies are deposited in the material by moving grain boundaries when diffusive fluxes along the boundary plane are associated with the boundary migration.
Article A Comprehensive Review on the Development of Ceramic Coatings for Thermomechanical Applications was published on July 1, 1986 in the journal High Temperature Materials and Processes (volume 7, issue 2-3).
Hydrogenase, desulfoviridin and molybdenum proteins have been isolated from a halophilic sulfate-reducing bacteria,Desulfovibrio salexigens strain British Guiana. At least 50% of the hydrogenase was found to be located in the periplasm. The hydrogenase has a typical absorption spectrum, a 400/280 nm ratio of 0.28, a m…
Abstract Nondestructive measurement of carburization of cracking tube and selecting carburization‐resistant alloys have been of much importance in design and maintenance of such equipment as ethylene cracking heater. In this paper, the authors firstly describe the newly developed manner of measuring carburization and…
A brief critical review of the electrical, thermal and flammability properties of silicone oil for transformers is presented in comparison to the same properties for polychlorinated biphenyl fluids (PCB) and mineral oil. It is deduced that silicone oil is an acceptable substitute for PCBs. Despite a significantly lowe…