Materials Literature
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The concrete could be considered as a thick solid particles suspension in fine particles suspension. The rhealogy of the last one influences very hardly the concrete behaviour, so that the importance to realize an study concerning the mortars and pastes rheology. The first objective of this work has been to determine…
A comparison was made of the efficacy of two consolidants and two water repellents applied to samples of granite under optimum conditions, with the efficacy of the same products applied to the granite in the presence of soluble salts or water. The amount of product absorbed and the amount of dry polymer remaining afte…
The aim of this work is to characterize the ancient building materials (mud wall and adobe) of three churches in the province of Palencia. This is the first part of a study which seeks to evaluate how the mud walls of the tower of the church of Cisneros reacted to restoration treatment which consisted of a structural…
This present work tries to reproduce, through test of controlled conditions in accelerate aging, reproducing the most frequent ambients in places affected by a clime of continental tendency, the more common forms of deterioration in historical interesting buildings, constructed with granitic rocks in those places. We…
Assessment of quality in crystal structure determination entails analysis of global statistics. In data reduction, quality is assessed using R(merge) and mean I/sigma(I). Progress in structure solution and refinement is checked by the goodness of fit, variants of the R index, R(cryst), and its cross-validation counter…
In view of considerable interest in the development of liquid phase sintered structural and high-temperature ceramics on the base of silicon carbide, a comprehensive review of the data on structure, properties and the known methods of processing of silicon carbide seems timely. The most striking feature of silicon car…
Experimental as well as theoretical work indicates that the relative stability of the ordered and the disordered states of a compound may be significantly affected by their difference in vibrational entropy. The origin of this difference is usually attributed to the fact that disordering reduces the number of stiff bo…
The effect of thermal history on the rheological behavior of ester- and ether-based commercial thermoplastic polyurethanes (TPUs) was investigated. 1 H and 13 C nuclear magnetic resonance (NMR) spectroscopy indicated that the ester-based TPU consisted of 4,4‘-diphenylmethane diisocyanate (MDI) and butanediol (BDO) as…
The effects of pore sizes, shapes, and orientations on the mechanical properties of thermally sprayed ceramic coatings are investigated. The analysis is conducted using detailed finite‐element models with geometries similar to those of actual ceramic coatings containing many embedded pores. These microstructural model…
Pitting potentials (Epit) of aluminum alloy (AA) 2024-T3 (UNS A92024) were improved with additions of 0.01 M sodium chromate (Na2CrO4, pH 8) and 0.0062 M Na2CrO4 + 0.0038 M chromic acid (H2CrO4, pH 6) additions to 0.1 M sodium sulfate (Na2SO4) + 0.005 M sodium chloride (NaCl, pH 6) after 2-h periods at open-circuit po…
A novel hybrid biomaterial for tissue engineeringhas been developed by forming collagen microsponges in the pores of poly(alpha ester) sponge. Poly(alpha ester) sponge provides the skeleton with a high degree of mechanical strength, while the collagen provides cell compatibility. The Figure shows mouse fibroblast cell…
Abstract We report the synthesis of block and alternating thiophene/phenylene co‐oligomers that is based either on the Suzuki coupling reaction or on the Grignard reaction. These reaction schemes enable us to obtain the target compounds at reasonably high yields. The resulting materials have been fully characterized t…