Materials Literature
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The dynamics of electronic energy transfer (EET) for a series of spherical porphyrin arrays based on different generations of poly(propylene imine) dendrimers have been investigated using time-resolved fluorescence anisotropy measurements (TRAMS) in a glass environment. The first, third, and fifth generation dendrimer…
Gel‐glasses of various compositions in the x ZrO 2 . (10 – x )SiO 2 system were fabricated by the sol–gel process. Precipitation due to the different reactivities between tetraethyl orthosilicate (TEOS) and zirconium(IV) n ‐propoxide has been eliminated through the use of 2‐methoxyethanol as a chelating agent. Thermal…
The Raman shifts as functions of pressure were measured for the radial breathing mode and tangential modes in carbon nanoropes containing (10,10) and (17,0) single-walled tubes. An abrupt decrease in the rate of change of the Raman shift with pressure for the tangential modes, and the disappearance of the radial breat…
The local water content in cementitious material depends on the equilibrium between its atmospheric environment and its bulk properties. So, the moisture profile in material can vary with time. The object of this study is to follow the change of this profile by measuring the electrical impedance of the material with p…
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…