Concrete impregnation with acrylic resins
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Materials Literature
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Stone alterations in some monuments
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Cement mortar resistance to corrosion caused by magnesium salt solutions
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First Latin American meeting of cement and concrete institutions
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Method for the analytical determination of total sulphur sulphates contents in concrete and aggregates; and remarks on the need to separate from the total permissible sulphur the proportion due to sulphates
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Bibliografía
Magnetic interactions in molecules and an analysis of molecular electronic charge distribution from magnetic parameters
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic interactions in molecules and an analysis of molecular electronic charge distribution from magnetic parametersW. H. FlygareCite this: Chem. Rev. 1974, 74, 6, 653–687Publication Date (Print):December 1, 1974Publication History Published online1 May 2002Published inis…
Dependence of the glass transition temperature on heating and cooling rate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDependence of the glass transition temperature on heating and cooling rateCornelius T. Moynihan, Allan J. Easteal, James Wilder, and Joseph TuckerCite this: J. Phys. Chem. 1974, 78, 26, 2673–2677Publication Date (Print):December 19, 1974Publication History Published online16…
The motion of 180° domain walls in uniform dc magnetic fields
The equations of motion of a 180° domain wall in an infinite uniaxially anisotropic medium which is exposed to an instantaneously applied uniform dc magnetic field H0 have been integrated numerically. Below the critical field Hc =2παM0 (α is the Gilbert loss parameter and M0 the saturation magnetization), where a stea…
A study of the dynamic behaviour of a carbon-fibre composite using the split Hopkinson pressure bar
The mechanical behaviour of carbon-fibre-composite specimens of fibre volume fractions from 30 to 60% and various fibre orientation has been investigated experimentally for compression loading up to 200 MN m −2 and duration approximately 30 μs. A split Hopkinson pressure bar technique has been employed with an optical…
Hyperfine magnetic fields and electric field gradient at the nuclei of diamagnetic gallium ions in lithium ferrite gallates
The magnitudes and signs of isotropic and anisotropic hyperfine (HF) fields and the magnitude of the electric field gradient (EFG) at the nuclei of diamagnetic Ga3+ ions in tetrahedral sites of lithium ferrite gallates Li0.5Fe2.5−xGaxO4 (0.01 ≦ x ≦ 0.65) have been determined from the analysis of low temperature Ga69.7…
Study of the conductivity and the reorientation mechanism in the cesium halides doped with Cd++ and Pb++
The dielectric relaxation of CsBr and CsI containing impurities such as Pb++ and Cd++ has been investigated, using the dielectric loss method. The activation energy E, required for the migration of a cation vacancy, obtained from de conductivity measurements is in good agreement with that resulting from the dielectric…
ESR of T4+ in amorphous and crystalline V2O5
The ESR study of V4+ in amorphous V2O5 shows that this ion is in a site having a strong axial anisotropy. The parameters of the spin Hamiltonian describing the spectra are g∥ = 1.926, A = 190 × 10−4 cm−1, g⟂ = 1.984, and B = 73×10−4 cm−1. A comparison with the ESR spectra of V4+ in V2O5 single crystals shows that shor…
Raman spectrum and phase transition in sodium azide
The Raman spectra of both the $\ensuremath{\alpha}$ and $\ensuremath{\beta}$ phases of Na${\mathrm{N}}_{3}$ have been obtained and interpreted. The Raman-active ${E}_{g}$ mode of the $\ensuremath{\beta}$ phase splits into ${A}_{g}$ and ${B}_{g}$ modes as Na${\mathrm{N}}_{3}$ undergoes a phase transition at approximate…
New optical storage mode in liquid crystals
A novel electrically reversible storage effect in doped nematic liquid crystals is described. The ``off state'' is homeotropic nematic and the ``on state'' a single layer of densely packed spherulites. Both states are stable in time. The effect was observed in a narrow range of pitch and cell thickness combinations, a…
Microscopic magnetic properties of vanadium oxides. II.V3O5,V5O9,V6O11, andV6O13
The local distributions of magnetization in ${\mathrm{V}}_{3}$${\mathrm{O}}_{5}$, ${\mathrm{V}}_{5}$${\mathrm{O}}_{9}$, ${\mathrm{V}}_{6}$${\mathrm{O}}_{11}$, and ${\mathrm{V}}_{6}$${\mathrm{O}}_{13}$ have been determined in their metallic, insulating, and antiferromagnetic insulating phases by means of $^{51}\mathrm{…
Photoemission and electron energy loss spectroscopy of GeO2 and SiO2
The electronic structure of GeO2 and SiO2 has been studied by ultraviolet photoemission spectroscopy (UPS) and electron energy loss spectroscopy (ELS) using thermally grown films prepared in ultrahigh vacuum (p ∼ 10−10 Torr). A consistent energy level model of both filled and empty states is constructed from the UPS a…
Density of valence states of CuCl, CuBr, CuI, and AgI
The photoelectron energy distribution curves for CuCl, CuBr, CuI, and AgI have been measured for $\ensuremath{\hbar}\ensuremath{\omega}=16.8, 21.2, 26.9, 40.8, 48.4, \mathrm{and} 1486.6$ eV. By exploiting the strong dependence on $\ensuremath{\hbar}\ensuremath{\omega}$ of the photoionization cross sections of the atom…