On the setting and hardening of cements
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Materials Literature
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Substituting complexometry for permanganimetry in lime evaluation in tests for puzolana
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Some questions posed by the use of cement
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Electron microscopy of clinker by the replica technique
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Applications of an IBM 1800 computer to Spanish cement plants
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CONTROL OF CRACKING IN CONCRETE STRUCTURES
PRINCIPAL CAUSES OF CRACKING AND RECOMMENDED CRACK CONTROL PROVISIONS ARE PRESENTED IN THIS REPORT. IT COVERS THE BASIC MECHANISM OF MICROCRACKING AND FRACTURE MECHANICS IN CONCRETE. IT DEALS WITH CONTROL OF CRACKING DUE TO VARIOUS CAUSES IN THE FOLLOWING AREAS: SHRINKAGE, REINFORCED CONCRETE BEAMS, ONE-WAY AND TWO-WA…
Magnetic exchange in transition metal complexes. IX. Dimeric nickel(II)-ethylenediamine complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic exchange in transition metal complexes. IX. Dimeric nickel(II)-ethylenediamine complexesA. P. Ginsberg, R. L. Martin, R. W. Brookes, and R. C. SherwoodCite this: Inorg. Chem. 1972, 11, 12, 2884–2889Publication Date (Print):December 1, 1972Publication History Publish…
Void Growth in an Elastic-Plastic Medium
The uniaxial deformation of an elastic-plastic medium containing a doubly periodic square array of circular cylindrical voids is studied under plane-strain conditions. Both the effects of geometrical nonlinearities resulting from large deformation and physical nonlinearities arising from plastic material behavior are…
Linear and nonlinear optical properties of some ternary selenides
The refractive indices of the ternaryA^{I}B^{III}C_{2}^{VI}semiconductors CuAlSe2, AgGaSe2, CuGaSe2, and AgInSe2have been measured over most of the transparency range of these crystals. The optical nonlinear coefficients for second-harmonic generation of AgGaSe2CuGaSe2, and AgInSe2have also been measured. Three-freque…
Unified Hydrodynamic Theory for Crystals, Liquid Crystals, and Normal Fluids
A unified hydrodynamic theory is presented that is appropriate for crystals; smectic, cholesteric, and nematic liquid crystals; glasses; and normal fluids. In the theory, the increased spatial degeneracy as the system progresses from crystalline and mesomorphic phases to the isotropic fluid phase is marked by successi…
Kinetics and Mechanism of the Dehydration of Crystal Hydrates
The present review considers experimental data and the results of theoretical studies of the dehydration of crystal hydrates. The data have been systematised according to the stages of the reaction in the light of modern theories of the kinetics and mechanism of chemical reactions in solids. Attention has been drawn t…
Oxygen Compounds of Iron(VI, V, IV)
Published information on the chemistry of oxygen compounds of iron — the ferrates(VI, V, IV) — has been reviewed briefly. The methods of preparation, chemical properties, thermal decomposition in air and in O2, the kinetics and mechanism of decomposition in solution, methods of analysis, structural, spectroscopic, and…
Elastic Constants of Argon and Neon by Brillouin Scattering from Single Crystals near Their Triple Points
The adiabatic elastic constants of single crystals of neon at 24.3 K and of argon at 82.0 K have been determined by Brillouin scattering. For argon the values are ${C}_{11}=2.33\ifmmode\pm\else\textpm\fi{}0.08$, ${C}_{12}=1.49\ifmmode\pm\else\textpm\fi{}0.06$, ${C}_{44}=1.17\ifmmode\pm\else\textpm\fi{}0.07$, in units…
Magnetic Structures of Samarium
The magnetic structures of metallic samarium have been determined from neutron-diffraction data on a single crystal of $^{154}\mathrm{Sm}$. Anomalies in a number of physical properties of this metal at 106 and 13.8\ifmmode^\circ\else\textdegree\fi{}K are associated with ordering of the moments on the hexagonal and cub…
Bound-Polaron Hopping in NiO
We report observation of bound-polaron hopping in pure NiO single crystals. The observed activation energy is $\ensuremath{\approx}0.7$ eV, the bandwidth $J\ensuremath{\approx}{10}^{\ensuremath{-}2}$ eV, and the binding center is suggested to be the ${\mathrm{Ni}}^{+2}$ vacancy.
On the existence and structure of gadolinium and samarium monoxides and their related lower oxides
The monoxides of the rare earth metals are currently receiving attention because of the possibility of their being ‘n’ or ‘p’ type semiconductors [6]. Unlike the R2O3 type sesquioxides whose structures and existence have been well established, very little details regarding the existence, structure, and defect substruc…
On strain delay time at the superconducting transition
In the creep process a metal transition to the superconducting state is accompanied by a sharp increase in the strain rate. This increase however does not start simultaneously with the transition but in some time (relaxation time or delay time). Experiments proved this time to be strongly dependent on the temperature…
Spectres de photoélectrons X de composés solides de cuivre Relation entre la présence de raies satellites et l'état d'oxydation du cuivre
L'étude comparative des spectres de photoélectrons X de composés de cuivre I et II, ainsi que l'examen des modifications apparaissant au niveau des raies du cuivre et de l'oxygène dans les composés de cuivre I suite à l'action de gaz actifs (O2, H2O), indiquent que la structure satellite adjacente aux raies du cuivre…
Phase transition in diamond-structure crystals during hardness measurements
The mechanism of microhardness print forming in diamond-structure crystals is considered to be the result of a local phase transition under the indenter with the formation of a metallic phase due to the high hydrostatic pressure generated in this case. It is shown that at the temperature T < 0.3 to 0.4 Tml, where the…