X ray diffraction. Applications to construction quality control
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Materials Literature
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Contribution to Portland cement hemihydrite and gypsum content determination
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Optimum conditions for concrete steam treatment
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Cement corrosion in sulphate containing liquid media
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Bibliografía
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Quick analysis method of sulphuric anhydride
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Damage to Artesa slabs Latex-bitumen surface
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Prevention of ear damage during vibrating table concrete compaction
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The phase transformation and physical properties of the MnBi and Mn<inf>1.08</inf>Bi compounds
The phase transformation and magnetic properties of manganese bismuthide have been reinvestigated with single crystal samples of low temperature phase (LTP) and high temperature phase (HTP) in the quenched state (QHTP). It was established that the LTP and HTP are separate compounds with the chemical formulae MnBi and…
Dimerization of a linear Heisenberg chain in the insulating phases ofV1−xCrxO2
The nuclear magnetic resonance (NMR) of ${\mathrm{V}}^{51}$ has been studied in the series of compounds ${\mathrm{V}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{O}}_{2}$ between 100 and 350 K. Three insulating phases are clearly distinguished. In the low-temperature ${M}_{1}$ phase only one V site is seen with a posi…
A Charge Simulation Method for the Calculation of High Voltage Fields
A numerical method for the computation of electrostatic fields is described. The basis of the method is the use of fictitious line charges as particular solutions of Laplace's and Poisson's equations. Details are given of a digital computer program developed for field calculations by means of this method, and its appl…
Studies on the gill of Mytilus edulis : the eu-latero-frontal cirri
Abstract Adjacent eu-latero-frontal cirri beat alternately and alternate cirri exhibit metachronous activity. Each cirrus consists of 22─26 pairs of cilia arranged in two parallel but alternating rows. Individual cilia leave the shaft of the cirrus at regular (0.6 μm) intervals on each side to extend across the interc…
Coupling between nuclear Zeeman and electronic spin-spin interactions in dielectric solids
The theory of thermal mixing between nuclear Zeeman interactions and electronic spin-spin interactions of impurities in dielectric solids, used to interpret the mixing between the Zeeman interactions of two nuclear spin species as the result of their separate coupling with the electronic spin-spin reservoir. The predi…
Metallkomplexe mit Tetrapyrrol‐Liganden, X1) Synthese und Konfiguration weiterer (α,γ‐Dimethyl‐α,γ‐dihydrooctaäthylporphinato)metallkomplexe
Abstract Ausgehend von Metallkomplexen 1a, 1f–1m des Octaatlylporphins [(OAP)MXY (M = Zn, Pd, Pt, Ga, In, Mn, Ti, V, Si)] wurden weitere (a,y‐Dimethyl‐a,y‐dihydrooctaathylporphinato)metallkomplexe 2f–2n [(OxPMe2)MXY (M = Pd, Pt, Ga, In, Mn, Ti, V, Si, Sn)] dargestellt und spektroskopisch charakterisiert. Die reduziere…
Electron Spin Resonance of Lattice Defects in Zinc Oxide
ZnO powder samples sized from 500 to 3 μm are annealed in reducing and oxidizing atmosphere, thus creating geometrical lattice defects which in the paramagnetic case can be detected with ESR. Predominantly oxygen vacancies, oxygen at interstitial sites, and the coupling of these two kinds of defects correlated to the…
Photoexpansion and ``thermal contraction'' of amorphous chalcogenide glasses
Expansion due to illumination (photoexpansion) and contraction due to heat treatment (``thermal contraction'') of As–Se–(S)–Ge glass films have been observed utilizing the bimetal structures. This property is related to the reversible photodarkening effect of these chalcogenide glass films.
Ground and excited states of the diatoms CN and AlO
Multiconfiguration self-consistent field (MCSCF) wavefunctions are obtained for the ground and some low-lying valence excited states of the same symmetry for the diatomic systems CN and AlO. The spectroscopic constants of these states as well as their dipole moments as a function of the internuclear separation are als…
Optical conductivity studies in a one-dimensional organic metal: Tetrathiofulvalene tetracyanoquinodimethan (TTF) (TCNQ)
The optical properties of tetrathiofulvalene tetracyanoquinodimethan (TTF) (TCNQ) are reported in the visible and near infrared from room temperature to 4.2 K. The experimental results are analyzed in terms of simple Drude theory, with corrections made for anisotropic effects introduced by the anisotropic band structu…
Optical, electrical-transport, and heat-capacity studies of the solid solutionsTixTa1−xS2,ZrxTa1−xS2, andTixNb1−xSe2
The electrical resistivity and optical absorption of the layered dichalcogenides ${\mathrm{Ti}}_{x}{\mathrm{Ta}}_{1\ensuremath{-}x}{\mathrm{S}}_{2}$, ${\mathrm{Zr}}_{x}{\mathrm{Ta}}_{1\ensuremath{-}x}{\mathrm{S}}_{2}$, and ${\mathrm{Ti}}_{x}{\mathrm{Nb}}_{1\ensuremath{-}x}{\mathrm{Se}}_{2}$ ($0\ensuremath{\leqq}x\ensu…