Materials Literature
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Data are presented on several dielectric materials which typically possess varying degrees of pyroelectric response depending largely on the electrical (poling) and thermal (heating) conditioning of the materials. A measurement technique described in the preceding paper was used to analyze these materials. The results…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXT1,4,7-Triazacyclononane-N,N',N''-triacetate (TCTA), a new hexadentate ligand for divalent and trivalent metal ions. Crystal structures of [CrIII(TCTA)], [FeIII(TCTA)], and Na[CuII(TCTA)].bul.2NaBr.bul.8H2OKarl Wieghardt, Ursula Bossek, Phalguni Chaudhuri, Willy Herrmann, Ber…
Coccoliths of the unicellular marine alga Emiliania huxleyi are formed intracellularly in a specialized vesicle. Closely associated with the CaCO 3 crystals of the coccoliths is an acid Ca 2+ ‐binding polysaccharide. The latter is considered to fulfil a regulatory function in CaCO 3 crystallization. In this study it i…
This is the first of two papers wherein a new method is described which allows the analysis and evaluation of electric currents, such as pyroelectric currents and thermally simulated conductivity or currents arising from heated dielectric materials. It is shown for certain temperature and frequency ranges that the ac…
Abstract Blends of poly(vinylidene fluoride) (PVF 2 ) and poly(methyl methacrylate) exhibit complex melting behavior when crystallized at low undercoolings. Three crystals comprised of two different PVF 2 forms grow. Hoffman‐Weeks plots of the observed melting points T m of these crystals versus crystallization temper…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEpimerization of aldoses by molybdate involving a novel rearrangement of the carbon skeletonMichael L. Hayes, Nicholas J. Pennings, Anthony S. Serianni, and Robert BarkerCite this: J. Am. Chem. Soc. 1982, 104, 24, 6764–6769Publication Date (Print):December 1, 1982Publication…
A blazing technique using electron-beam lithography to achieve higher efficiency of gratings and Fresnel lenses is described. Transmission-type blazed gratings have been formed in polymethyl methacrylate films. As a result of measurement, we found that their diffraction efficiency of the first order in these gratings…
Although the Ti-Ni alloy is the most important material for applications, there has been no systematic work on its deformation behavior. In the present report, the effects of ageing, Ni-content and annealing right after cold work on the shape memory effect and on the pseudoelasticity are systematically investigated by…
Surface-enhanced Raman scattering (SERS) due to charge-transfer interactions between the adsorbed molecule and the metal surface is analyzed using the semiempirical Wolfsberg–Helmholz method to relate the molecule–surface interactions and the resulting charge-transfer states to the overlap integrals between the metal…
Calculations reported here show that small gas nuclei in a liquid acted on by microsecond ultrasonic pulses may grow into transient cavities that collapse violently. The maximum pressures and temperatures generated by such collapsing cavities are found in these calculations to be of the order of 1000 to 70 000 bars an…
The internal strains asSociated with the martensitic phase transformation of zirconia were used to introduce microcracks into Al 2 O 3 /ZrO 2 composites. The degree of transformation was found to be dependent on the volume fraction of ZrO 2 and its size, the latter of which could be controlled by suitable heat treatme…
Abstract The boiling 5-M-NaOH treatment was found to aid in the identification and characterization of goethite and hematite by effectively concentrating the two Fe oxides in kaolinitic-gibbsitic soil clays. No transformations of goethite to hematite or hematite to goethite were detected, but poorly crystalline, highl…
Neutron powder diffractometers operating with large vertical counter acceptance angles produce diffraction patterns in which the peaks are shifted and broadened, and may become distinctly asymmetric. It is shown that a sum of Gaussians generally provides a good approximation to these peaks. The sum of Gaussians has be…
A study has been made on improving the adhesion of a glass ionomer cement by the chemical treatment of dentin and enamel surfaces. The most effective surface conditioners were high molecular weight substances containing a multiplicity of functional groups capable of hydrogen bonding. Low molecular weight chelating age…
Monodisperse TiO 2 powders were synthesized by the controlled hydrolysis of dilute alcoholic solutions of titanium alkoxides. The state of powder aggregation in dispersions and powder packing in the green bodies strongly affected the sintering behavior. The sintering of uniformly packed powder compacts resulted in fin…
The effect of a small quantity of CaF2 on the capacity of reaction of raw mixes has been studied in this paper; and for this purpose the thermal behaviours of a commercial raw mix without the addition of CaF2 were compared at different ages of clinkerization. The times required to complete the reactions at different t…
A brief exposition of the situation and tendencies of the cement industry to contemplate its incidence in the development of norms of the conglomerates. Comments are made on the historical development of the norms of cements in Spain and the present situation of the national norms at a world level. Justifying the nece…
Some time ago an Inquiry concerning the items exposed in the title of this Report was prepared and circulated by the Norwegian member of the CEB/Commission VIII, among the members of this Commission. The responses received so far have been collected and studied, and the ordered content of them has been exposed in this…
In this work, which is a follow-up of others, the evolution of structural features of enriched fraction (attacked-hydrated cement) is studied by DRX, extracted from one of the mortar prisms (1:3) of 1 X 1 X 6 cm of the various series of test specimens made with a portland cement resistant to sulfate (cement 2) and wit…