Materials Literature
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Silica fume (SF) or microsilica is related mainly with preparation of High Resistance Concrete. This has justified its use -together with portland cement (I-42'5/SR,MR) and an superfiuidifying additive- in the preparation of a concrete whose value for compressive mechanical resistance at early ages (only 5 to 10 hours…
The main factors of deterioration that affect the Cathedral of Baeza are of a natural origin, basically thermic and hydraulic. Two types of calcarenite were employed in the construction of the major part of this building: one 'franca" of medium porosity and another "viva" harder and more compact, both extracted from t…
We report large third-order nonlinear optical susceptibilities (?3?)(ijkl) of new tetrathiafulvalene derivatives, using the degenerate four-wave mixing (DFWM) method. To understand the physical nature of the optical nonlinearities, we separate their electronic and nuclear contributions. The electronic contribution to…
A nanosieve with a very uniform pore size of 260 nm and a pore-to-pore spacing of 510 nm has been fabricated using multiple exposure interference lithography and (silicon) micromachining technology. The nanosieve filter consists of a thick silicon nitride membrane perforated with submicron diameter pores and a macrope…
As dimensions reach the deep-submicrometer level on the order of the mean-free path of electrons, increases in the resistivity of a metal corresponding to reductions of wire dimensions is a concern. To understand the resistance dependence on the dimensions, resistance of Cu versus interconnection size was analyzed. Th…
It is well known that the angular separation of non-paraxial diffracted orders from a linear grating varies drastically with incident angle. Furthermore, for oblique incident angles (conical diffraction), it is rather cumbersome both analytically and graphically to describe the number and angular position of the vario…
This paper studies the effect of some pollutant agents in urban environments -gaseous SO2, acid rain and solid particles- on carbonate and siliceous building stones with different petrophysic characteristics. The selected environments have been London, Garston (UK) and Burgos (Spain) and the exposed materials have bee…
The employment of timber in structures in Spain was hurting of the nonexistence of accepted calculation procedures. The recent adoption and publication of the Eurocode 5 compels to the employment of the characteristic values of the material in the structural calculation by the method of the finite elements. This repor…
Polaron binding energy and effective mass are calculated for semiconductors with wurtzite crystalline structure from the first order electron-phonon corrections to the self-energy. A recently introduced Frohlich-like electron-phonon interaction Hamiltonian which accounts for the LO and TO polarizations mixing due to t…