Genenal remarks on Portland cement concretes and a basis for their design
No available
Materials Literature
文献浏览
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Extracts from technical journals
Conclusions of the 2nd. General Assembly of the Instituto Eduardo Torroja of Construction and Cement
Not available
Theory, Measurement, and Application of Thermal Properties of Biomaterials
Biomaterials are capable of heat transfer-energy transport by virtue of a temperature gradient. In the case of a living biomaterial, the heat transfer capability of the material can be especially important because the state of life may depend upon the maintenance of a specific temperature. All of the three basic mecha…
Studies on reactions of the N‐phosphonium salts of pyridines. XIV. Wholly aromatic polyamides by the direct polycondensation reaction by using phosphites in the presence of metal salts
Abstract Poly‐ p ‐benzamide of high molecular weight (η inh = ∼ in H 2 SO 4 ) was obtained by the direct polycondensation reaction of p ‐aminobenzoic acid ( p ‐ABA) by means of diphenyl and triaryl phosphites in N ‐methylpyrrolidone (NMP)‐pyridine solution containing lithium and calcium chlorides. Molecular weight of…
Constitutive Equations for Elastic-Viscoplastic Strain-Hardening Materials
A set of constitutive equations has been formulated to represent elastic-viscoplastic strain-hardening material behavior for large deformations and arbitrary loading histories. An essential feature of the formulation is that the total deformation rate is considered to be separable into elastic and inelastic components…
Metal-insulator transition in vanadium dioxide
The basic physical parameters which govern the metal-insulator transition in vanadium dioxide are determined through a review of the properties of this material. The major importance of the Hubbard intra-atomic correlation energy in determining the insulating phase, which was already evidenced by studies of the magnet…
Electro-optical effects in liquid crystals
This review gives information on the electric and optical properties of liquid crystals (LC), and discusses in detail various electro-optical effects in nematic, cholesteric, and smectic LC. Dielectric deformations of LC in electric fields, electrodynamic instabilities, the electromechanical effect, etc., are treated.…
Impact fracture of composite sandwich structures
An experimental investigation of impact-initiated failures in high-strength graphite/epoxy and Kevlar-49/epoxy sandwich structures has been conducted. The tests consisted of firing small diameter aluminum projectiles with a velocity range of 16-67 meters/second (52-220 ft/sec) at preloaded sandwich specimens. These te…
Direct Measurement of One-Dimensional Plasmon Dispersion and Damping
Plasmons in the one-dimensional organic metal tetrathiafulvalene-tetracyanoquinodimethane were directly measured by high-energy inelastic electron scattering in thin crystalline films at 300\ifmmode^\circ\else\textdegree\fi{}K. For plasmons propagating along the conducting $b$ axis the plasmon energy decreases from 0.…
Optically Induced Localized Paramagnetic States in Chalcogenide Glasses
Optically induced ESR and absorption due to localized paramagnetic states in the forbidden gap have been observed in several semiconducting chalcogenide glasses below \ensuremath{\sim}15 K. Analysis of the ESR spectra indicates that these centers are holes localized on chalcogens and are not directly associated with i…
An analysis of the effects of level crossing and anticrossing in the resonant scattering of thermal phonons
An analysis is given of the changes that occur in the thermal conductivity of a solid containing resonant phonon scattering centres when there are crossings or anticrossings of levels involved in the scattering. At a level crossing, the changes are due to interference between the scattering processes involving the two…
Photograph of an Electron-Hole Drop in Germanium
We present the first photograph of an electron-hole drop in germanium.Received 21 April 1975DOI:https://doi.org/10.1103/PhysRevLett.34.1292©1975 American Physical Society
The range of homogeneity of VO2 and the influence of the composition on the physical properties. II. The change of the physical properties in the range of homogeneity
The electrical resistivity (semiconductor–metal transition), the thermoelectric power, and the magnetic susceptibility of well-characterized VO2 monocrystals and powdered samples in the range of homogeneity were measured. The physical properties gave no hint of an extension of the range of homogeneity towards oxygen e…
Optical and electrical properties of doped In2O3 films
Sn doped In2O3 films are electrically conductive and transparent in the visible range of the spectrum. Films with a plasma wavelength in the 1 μm region have been prepared by spraying a solution of InCl3 and SnCl4 onto a heated substrate. The free electron concentration is observed to increase with the Sn content up t…
Copper diffusion in single-crystalα−Zr
Tracer diffusion of $^{64}\mathrm{Cu}$ in $\ensuremath{\alpha}\ensuremath{-}\mathrm{Z}\mathrm{r}$ single crystals has been measured in the temperature range (615-860)\ifmmode^\circ\else\textdegree\fi{}C. The temperature dependences of the $^{64}\mathrm{Cu}$ diffusion coefficients in directions parallel to and perpendi…
High-energy optical-absorption bands of transition-metal ions in fluoride host crystals
Absorption bands in the region from 40 000 to 80 000 ${\mathrm{cm}}^{\ensuremath{-}1}$ have been found for the divalent ions of V, Cr, Mn, Fe, Co, and Ni in the host crystals KMg${\mathrm{F}}_{3}$, Ca${\mathrm{F}}_{2}$, and Mg${\mathrm{F}}_{2}$. Their spectral positions are near those of the free-ion $3d\ensuremath{\r…
The Raman spectrum of (TMA)2UCl6 and (TMA)2SnCl6 crystals and of TMACl in solution
The Raman spectrum of (TMA)2UCl6, not reported previously, is presented and the assignments of the observed bands to normal modes of vibration are discussed based on polarized room temperature scans of single crystals. Seventeen of the eighteen fundamental vibrational bands and seven nonfundamental ones are identified…
Fourth-order elastic constants and the temperature dependence of second-order elastic constants in cubic materials
A theory analyzing the temperature dependence of second-order elastic constants on the basis of a quasiharmonic-anisotropic-continuum model is applied to LiBr, KCl, RbF, $\ensuremath{\beta}$-brass, Cu, Ag, and Au. The number of fourth-order elastic constants is reduced from 11 to 2 by assuming that nearest-neighbor (n…
Structure of Nickel Orthophosphate
Ni 3 P 2 O 8 crystallizes in the monoclinic system with space group P2 1 /c with a = 5.830(2), b = 4.700(2), c = 10.107(4) Å, β = 91.22(2)°, and Z = 2. The structure was refined by full-matrix least squares methods to a final R value of 0.035 using 986 symmetry independent reflections. The structure is isotypic with t…