A Contribution to the Study of the Mechanics of Formation of Ettringita During the Plastic Period of the Cement Paste
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Materials Literature
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Quantitative Analysis of the Mineralogical Stages of the Clinkers of Portland Cement. Qualitative and Quantitative Analysis, by Infrared Spectroscopy of the Mineralogical Stages of the Clinker of Portland Cement
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Laboratory Investigations of the Estimation of Expansive Clays
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A Test With Small Dimension Cylinders for the Rapid Determination of the Quality of Cement
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Table of Plastic Materials Usable in Construction
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Bibliografía
The hard-magnetic properties of rare earth-transition metal alloys
The intermetallic phases formed between the rare earth metals (R) and the elements of the 3-d transition series are a large group of new substances with interesting magnetic properties. They have been studied intensely in the last decade. Their properties are reviewed with a view toward their usefulness for permanent…
X ray Compton scattering
The author describes how the effect is being employed in several laboratories to obtain information about the momenta of electrons in solids and asserts that the information obtained is fundamental to the understanding of their basic physical and chemical properties.
Dielectric properties and relaxation in ethylene carbonate and propylene carbonate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric properties and relaxation in ethylene carbonate and propylene carbonateRichard Payne and Ignatius E. TheodorouCite this: J. Phys. Chem. 1972, 76, 20, 2892–2900Publication Date (Print):September 1, 1972Publication History Published online1 May 2002Published inissue…
COLLAGEN SUBSTRATA FOR STUDIES ON CELL BEHAVIOR
A simple technique is described for the preparation of collagen substrata containing 0 1% of collagen by weight, in the form of native bundles with a 640 A period, the substrata are similar in these respects to soft-tissue matrices These substrate are hydrated collagen lattices (HCLs) in which the watery milieu is hel…
New Ideas Concerning the Strength of Adhesive Joints of Polymers
The review was written by JJ.Bikerman specially for Uspekhi Khimii. Bikerman is one of the leading U.S. specialists in the theory and practical aspects of surface phenomena and adhesion in polymers and solids and therefore the presentation of his views on the nature and strength of adhesive joints is of very considera…
X-ray-excited optical fluorescence of ten rare earth ions in Y2O2S, La2O2S, and Gd2O2S
The optical fluorescence of ten trivalent lanthanide ions, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, and Tm in Y2O2S, La2O2S, and Gd2O2S have been measured by X-ray excitation at 300 K. Some lines of Eu3+, Gd3+, and Tb3+ in La2O2S at short wavelengths were found to be quenched at 300 K. La2O2S appeared to be a more efficien…
Electrical conductivity and thermal activation energies in Cu2O single crystals
A systematic investigation, performed on some fifty single crystals, between −40 and 250 °C shows that the values of the bulk resistivity ϱv (20 °C) range from 103 to 1013 Ωcm and that the activation energies lie between 0.1 and 1 eV. These values depend on the conditions of the cooling after oxydation and of high vac…
On the cation distribution in Ni1—x—yFex2+ ZnyFe23+O4 spinel ferrites
Infrared and Mössbauer measurements on spinel ferrites of the Ni1–x—yFe+ZnyFe+O4 system have been made. As a result from the analysis, it is supposed that Fe2+ ions are present in both the octahedral and tetrahedral lattice sites of the compounds investigated.
Effect of charge-transfer acceptors on dynamic scattering in a nematic liquid crystal
The addition of charge-transfer acceptors to a nematic liquid crystal at concentrations <0.1% has a profound effect on the voltage-transmission characteristics for dynamic scattering, reducing the threshold voltage by a factor of 2 for dc fields, but not appreciably altering the ac behavior. Charge-transfer ban…
Paramagnetic Resonance of Interstitial V4+ in TiO2
The effects of various technological processes on the electronic structure of vanadium-doped TiO2 crystals have been studied. The EPR spectra give clear evidence that by suitable thermal treatment in a reducing atmosphere the tetravalent vanadium ions can be transferred from the substitutional to the interstitial posi…
Electronic Band Structure and Optical Properties of3C-SiC, BP, and BN
The energy band structure and optical properties of the zinc-blende semiconductors $3C$-SiC, BP, and BN have been calculated using a nonlocal version of the empirical-pseudopotential method. The results of this investigation are discussed and compared to experiment. The agreement between theory and experiment is found…
Infrared Dispersion of Second-Order Electric Susceptibilities in Semiconducting Compounds
A unified study is presented of the infrared behavior of the second-order electric susceptibilities ${\ensuremath{\chi}}^{(2)}$ in semiconducting compounds for both longitudinal and transverse fields. The molecular model used previously for the calculation of ${\ensuremath{\chi}}^{(2)}$ for frequencies above the latti…
Electroreflectance and Band Structure ofGaxIn1−xPAlloys
The electroreflectance spectra of solution-grown ${\mathrm{Ga}}_{x}{\mathrm{In}}_{1\ensuremath{-}x}\mathrm{P}$ alloys were measured at room temperature in the whole range of composition. The variation of the ${E}_{0}$, ${E}_{1}$, ${E}_{0}^{\ensuremath{'}}$, and ${E}_{2}$ energies with concentration is reported: It is…
Optic Modes in AmorphousAs2S3andAs2Se3
New reflectance spectra are obtained for amorphous ${\mathrm{As}}_{2}$${\mathrm{S}}_{3}$ and ${\mathrm{As}}_{2}$${\mathrm{Se}}_{3}$. The spectra contain features not reported in earlier studies. Analysis of the spectra in terms of damped Lorentzian oscillators, combined with new Raman data, gives further support to th…