Materials Literature
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The experimental manifestations of dispersive (non-Gaussian) transient transport in disordered solids are discussed and compared with the predictions of theoretical treatments. The mathematical equivalence of the two theoretical approaches based on the formalisms of continuous-time random-walk (CTRW) and generalized m…
Pocos temas de un contenido tan específico y delimitado dentro del campo de la Durabilidad del Hormigón, entendida como resistencia química del material, han .tenido tanta difusión y han despertado tanta curiosidad, e incluso tanto interés en tan poco tiempo, como el de la reacción expansiva árido-álcalis, o álcali-ag…
La palabra cemento sirve para designar cualquier sustancia con capacidad adherente, mientras que el término conglomerante se aplica a la acción de aglutinar en un todo partículas que anteriormente estaban sueltas o independientes. Según su capacidad o no de endurecer bajo agua, los conglomerantes se clasifican en hidr…
Método de Koch y Steinegger para el ensayo de la resistencia química de los conglomerantes hidratados frente a los sulfatos.
Differential-thermal-analysis investigation in MnNiGe under pressure (8 kbar) shows that (i) the first-order TiNiSi-to-${\mathrm{Ni}}_{2}$In-type structural transition point ${T}_{D}$ decreases with increasing hydrostatic pressure ($\frac{d{T}_{D}^{h}}{\mathrm{dP}}=\ensuremath{-}12.2$ and $\frac{d{T}_{D}^{c}}{\mathrm{…
Initiation of electrical treeing in polyethylene is discussed with the emphasis of a charge injection and extraction process, which is considered to feature the incubation period during which there are no apparently visual change and no detectable partial discharges. Some evidences for the process are shown by electri…
A simple and practical method of correcting the hysteresis loss in a thin lamination for the effects of minor loops is described. The necessary correction is applied to the losses that would occur under conditions of sinusoidal flux density and the required empirical factor is derived using a broad range of loss measu…
Alkali niobate and tantalate glasses have been prepared by rapid quenching. These glasses exhibit room-temperature ionic conductivities as high as 10−5 (Ω cm)−1 and electronic conductivities less than 10−11(Ω cm)−1. In the case of LiNbO3, the glass conductivity is many orders of magnitude greater than that of the sing…
Dual radiation action is a process in which cellular lesions are produced as a result of the interaction of pairs of sublesions that are molecular alterations produced by ionizing radiation.Previous formulations of this process have employed a number of simplifying assumptions that limit the accuracy and the range of…
Abstract The structures of four polymorphs of Bi 2 O 3 were investigated by means of X‐ray and neutron powder diffraction. The position parameters of the oxygen atoms in α‐Bi 2 O 3 were refined. High temperature neutron diffraction shows that a complicated disorder exists in the oxygen sublattice of the fluorite relat…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe band structure of the tetracyanoplatinate chainMyung-Hwan Whangbo and Roald HoffmannCite this: J. Am. Chem. Soc. 1978, 100, 19, 6093–6098Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 September 1978https://pubs…
A study is made of the propagation of electromagnetic waves in a one-dimensional medium with a periodic variation of the refractive index. An asymptotic method is used to reduce the problem to the solution of well-known equations for coupled waves in which the expression for the coupling coefficient differs from the t…
One of the most important factors determining the properties of a solid polymer is the packing order. Crystallization is a means to control the degree and morphology of packing. There is a great difference between "free” and “induced” crystallization.The “free” crystallization leads to quasi-isotropic products, which…
The authors find the dispersion relation of the coupled magnetic-electromagnetic modes in a ferromagnetic slab in the Voigt geometry (applied static field H 0 and magnetisation M 0 in the plane of the slab, propagation in the perpendicular direction in the plane). The results differ significantly from those found by H…
Abstract Measurements are reported of the decay time of photoluminescence from the N3 centre: an impurity centre commonly found in natural diamond. The intrinsic decay time at low temperature is found to be 41 ± 1 ns. The decay time is specimen dependent, decreasing with increasing concentrations of pairs of substitut…