Materials Literature
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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…
Contrary to polyacetylene and polythiophene, the electrical conductivities of poly(p-phenylene) and poly(p-phenylenevinylene) can be increased remarkably by ammonium doping. This can be explained in terms of n-type doping. Diethylamine and triethylamine have also been found to be effective concerning these conducting…
The high-temperature behavior of the Ag-Ag2S electrode has been investigated in aqueous solutions of NaOH + Na2S, the compositions of which were of particular relevance to the kraft pulping process. Potentials were measured with respect to an external reference electrode and corrected for liquid junction potential (LJ…
Abstract Metallische Werkstoffe erfahren häufig beim Hochtemperatureinsatz eine Gefügeänderung durch die Eindiffusion eines Fremdelementes mit einer Ausscheidung von Verbindungen dieses Elementes mit einem Legierungsbestandteil (z.B. innere Oxidation, innere Nitrid‐, innere Sulfidbildung). Diese Gefügeänderung beeinfl…
Abstract The synthesis and photochemical behavior of three types of polysiloxanes containing phenyldisilanyl units as chromophore have been reported. Irradiation of thin liquid films of the polymer (2) prepared from copolymerization of octamethylcyclotetrasiloxane and 1,3,5‐triphenyl‐1,3,5‐tris(trimethylsilyl)cyclostr…
The electrocaloric effect in rhombohedral PLZT ceramics is studied as function of applied field and temperature. The results obtained are consistent with the general idea of the existence of an intermediate state of mixed polar and nonpolar regions in the interval of the diffuse phase transition. The step-like change…
Plasma resonance absorption of 633-nm photons in silver gratings produced holographically with groove spacing d = 2186 nm and corrugation amplitudes h = 9, 25, and 41 nm were studied in conical (nonplanar) diffraction geometries. Resonance absorption of p- and s-polarized incident photons were measured as a function o…
Abstract Molecular aggregation in polytrimellitamideimide (PAI) was investigated by small‐angle x‐ray scattering (SAXS). PAI films annealed above the glass transition temperature show a scattering peak characteristic of two‐phase structure. A one‐dimensional model was used to analyze these SAXS curves. The more ordere…
Abstract Rhombic single crystals of bariumchromate were grown in silica gels up to 1.5 mm in size. The influence of the initial p H‐value of the gel and the kind and concentration of reactants are studied. The crystal structure has been determined. The compound crystallizes in space group Pnma, with cell dimensions a…
The second and fourth orientational order parameters [Pbar]2, [Pbar]4 of the homologous series of 4-n-alkyl-4′-cyanobiphenyls (nCB, n = 5 ∼ 8) in the nematic liquid crystalline state have been determined from the Raman depolarization ratios by the resonance Raman probe method. It was found out that not only [Pbar]2 bu…