Aluminium cellular

Heat conductivity of hydride powders is insignificant, 0.3-lW/(m-K). For improvement of effective heat conductivity of a hydride reactor stuffing in it enter a skeleton from a high-temperature material (copper, aluminium, nickel). The design of such skeleton can be variously. For example, it can be as radial disks (a plate reactor), as a goffered insert (from the punched foil or a grid), the grids braided in a spiral, cellular bodies. 

The analysis shows, that for these structures A.ern there is only a function of a material of a skeleton and its porosity and weakly depends on heat conductivity of hydride. At characteristic for designs of reactors of porosity of cellular bodies (nickel, aluminium, copper) 0.9effective heat conductivity changes over a wide range 3[Pg.390]

Another technique of solid foam preparation is based on gas formation in a melted polymerising bulk or in concentrated water suspension of binding materials (cement, gypsum, lime), occurring after physical or chemical processes. It is also possible to incorporate air in a polymerising or solidifying substance bulk. For example, cellular-concrete represents a material in which gas bubbles are uniformly distributed in the bulk. The material produced when suspensions of binding substances are mixed with a foam is called cellular (foam) concrete. If the gas is formed in the concrete bulk as a result of a chemical reaction, for instance, in the reaction of aluminium powder with the liquid phase of the concrete solution, a gas-concrete is produced. 

The jS constituent f of the aluminium bronzes can exhibit two formations, firstly, a cellular or honeycombed network and, secondly, a considerably finer, lamellar, structure, analogous to the pearlite in annealed steels. 

PiREZ G, Garbossa G, Di Risio C, Vittori D and Nesse a (2001) Disturbance of cellular iron uptake and utilisation by aluminium. J Inorg Biochem 87 21-27. 

Aluminium(III) as a promoter of cellular oxidation. Coord Chem Rev 228 271—284. 

B. Paquette, H. Ali, R. Langlois, J.E. van Lier (1988). Biological activities of phthalocyanines-VIII. Cellular distribution in V-79 Chinese hamster cells and phototoxicity of selectively sulfonated aluminium phthalocyanines. Photochem. PhotobioL, 47, 215-220. 

The iron-binding agent, 54 inducing a negative iron balance (Breithaupt et al. 1986) also chelated AP . It relieved the inhibitory action of aluminium on parathyroid cells and osteoblasts (Rapoport et al. 1987). However, Cournot-Witmer and Pla-CHOT (1990) showed that in the parathyroid glands of aluminium-intoxicated patients the presence of aluminium deposits neither induced cellular damage or chief cell necrosis nor interfered with the production of parathyroid hormone. In normal... 

Environmental concern has promoted the development of systems to replace lead (especially from cables and cellular products). Cadmium-based stabilizers are also being phased out. To achieve the same effect, however, the replacements have to be complicated mixtures of salts. Organotin and calcium/zinc systems are favoured at present, but much will depend on the shape of any legislation in the future. In general, alternatives based on calcium and zinc are less effective, but are cheaper than those based on aluminium or magnesium. Water absorption can be a problem with systems not using heavy metals. 

Lu, T. and Chen, C. (1999). Thermal Transport and Fire Retardance Properties of Cellular Aluminium AUoys, Acta Mater., 47, pp. 1469-1485. 

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