Materials Literature
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This article comments on the increasing importance of the use of admixtures for concrete, mortars and grouts as well as the specific effects they produce, thus requiring a suitable Spanish Normative, whose performance was taken in charge by a Working Group of the Technical Commission n.° 83 from the IRANOR, created fo…
In previous work on galvanized reinforcements in contact with Ca-containing highly alkaline media, the authors have reported the existence of a threshold pH below with such a medium is passivated, but at pH values above this it corrodes continuously until it totally disappears. In this paper, after a brief literature…
In the present article the needed modifications for the very usual case of having a little quantity of samples are related. There are related in the same way the dimensional modifications of some of the pieces of the HERZOG press which allows with a full security the pressing of dust samples for the use of the automat…
A new measurement system is presented for impermeability of concrete to liquids and gas, of very easy execution. It's technical basis is developed, and some of the results obtained are related with the components used in it's dosification. Therefore, the judgments actually used for the quantification of concrete's uti…
In spite of the largeness of this work we can consider it as a brief resume, since we have employed a little sample among all the wide bibliography existing on calcium silicates. Our aim is to connect the hydraulic properties with the crystallographic ones; to clear up the theories about the stabilization into ambient…
We present the summary of several years of research about the inhibitor effect of NO2- on the corrosion of reinforcements. We have studied their inhibitor effect using galvanostatic and potentiodynamic polarization curves and we have measured the corrosion rates using the Polarization Resistance method (linear polariz…
A hierarchy of classifications for subgroups of space groups by means of Euclidean and affine normalizers is introduced. The different levels of this classification scheme are illustrated in detail with examples and its usefulness for various problems is demonstrated. The Euclidean (or affine) normalizers of a space g…
The streamer and return stroke concepts in positive corona breakdown are reviewed, and examined critically for the case of short (<5 cm) gaps in ambient air. It is shown that return strokes normally should not be observed, but that return streamers may occur in longer or highly overvolted streamer channels. A n…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly(isothianaphthene)Fred Wudl, M. Kobayashi, and A. J. HeegerCite this: J. Org. Chem. 1984, 49, 18, 3382–3384Publication Date (Print):September 1, 1984Publication History Published online1 May 2002Published inissue 1 September 1984https://pubs.acs.org/doi/10.1021/jo00192a0…
The right cerebral hemisphere of the rat was perfused in situ by retrograde infusion of HCO3 saline or blood into the right external carotid artery. Infusion rate was adjusted to minimize the contribution of systemic blood to flow in the hemisphere. During perfusion with whole or artificial blood, regional cerebral bl…
Structural and metallographic studies were carried out on the Nd-Fe-B alloy system as well as the Nd-Fe-B tetragonal compound on which record high energy magnets have been developed using a powder metallurgical technique. The study on the new magnet has also been extended to other R-Fe-B componds containing various ra…
An equation for a nonlinear calibration curve of volume fraction vs integrated intensity ratio is presented for monoclinic‐stabilized cubic ZrO 2 systems containing YO 1.5 , CaO, and MgO. A parameter in the equation was evaluated theoretically and is given for a range of cubic solid solution compositions.
Abstract Nonlinear optical properties are a sensitive probe of the electronic and solid‐state structure of organic compounds and as a consequence find various applications in many areas of optoelectronics including optical communications, laser scanning and control functions, and integrated optics technology. Because…
Radiation from a Q-switched YAG laser, focused on the (100) face of a single crystal diamond anvil in a high-pressure diamond cell, caused a portion of the diamond anvil face to melt. Potassium bromide mixed with graphite was under pressure between the anvils when melting occurred. The diamond surface melted at pressu…
High-resolution carbon-13 nuclear magnetic resonance (NMR) spectra of enzyme-inhibitor and enzyme-substrate complexes provide detailed structural and stereochemical information on the mechanism of enzyme action. The proteases trypsin and papain are shown to form tetrahedrally coordinated complexes and acyl derivatives…
Delocalization of excitation in a system of disordered but uniformly distributed centers, its quenching by alien admixtures, and self-quenching by cross relaxation by pairs of identical particles are considered. It is shown that the direct transfer of excitation from an initial center to its neighbors becomes sequenti…
Materials representing common interstratified clay minerals are shown to be composed of aggregates of fundamental particles. Transmission electron microscopy and x-ray diffraction demonstrate that the x-ray diffraction characteristics of a wide range of interstratification can be modeled experimentally by utilizing ma…
All the different crystalline (brittle (II), glassy (I g ), plastic stable (I) and metastable (I')) phases of 1-cyanoadamantane: C 10 H 15 CN are characterised by differential scanning calorimetry studies. The transition temperatures and their respective enthalpies are determined I g -I' (170K), II to I (280K, 5.5 kJ…
Silicones and fluorosilicones have traditionally been classified as high performance materials due to their suitability for use under extreme conditions and their processability has been particularly interesting as a result of the very flexible siloxane chain. The present paper discusses selected examples where more r…