Materials Literature
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Partial discharges in transformers cause high frequency (ultrasonic) pressure pulses to propagate through the insulating media. These are similar in character to stress waves propagated in solids during crack formation (acoustic emission). The techniques involved in the detection of acoustic emission (AE) are shown to…
Twelve freshwater and/or brackish water species of the generally regarded marine planktonic diatom genus Thalassiosira are known. The morphology based on light and electron microscopy, taxonomy, and distribution of six of them are discussed. The new combinations Thalassiosira faurii (Gasse) Hasle and T. rudolfii (Bach…
The corrosion of 90:10 Cu:Ni and 70:30 Cu:Ni alloys in flowing seawater (1.62 m/s) has been studied as a function of oxygen concentration using the linear polarization, ac impedance, and potential step methods for measuring the polarization resistance. The high nickel alloy is found to be more corrosion resistant than…
The purpose of this study was to determine the forces in the glenohumeral joint for isometric abduction (including all directions of rotation) in the plane of the scapula. The lines of actions of muscles were obtained from 3 upper quarter specimens, electromyographic data was used, as well as geometrical parameters of…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectron spectroscopy for chemical analysis studies of lead sulfide oxidationD. S. Zingg and David M. HerculesCite this: J. Phys. Chem. 1978, 82, 18, 1992–1995Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 Septembe…
Summary Analyses of glauconites and celadonites from continental sedimentary rocks and sea-floor basalts using X-ray diffraction, electron probe microanalysis, infra-red spectroscopy, and X-ray fluorescence spectroscopy are reported. The minerals are shown to be distinct species; each an isomorphous replacement series…
The effects of annealing conventionally sintered, hot‐pressed, and reaction‐sintered Sic have been investigated by optical and transmission electron microscopy. In conventionally sintered and hot‐pressed bodies, “composite” grains consisting of α‐SiC plates sandwiched between recrystallized β‐SiC envelopes grow rapidl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Onset of Entangled Behavior in Semidilute and Concentrated Polymer SolutionsJ. KleinCite this: Macromolecules 1978, 11, 5, 852–858Publication Date (Print):September 1, 1978Publication History Published online1 May 2002Published inissue 1 September 1978https://pubs.acs.or…
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…