Los enemigos del ladrillo conferencia pronunciada en la tercera reunión del ciclo de coloquios técnicos
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Esclerómetro rotativo automático
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El cloruro cálcico como acelerador en la prefabricación del hormigón
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Isomerism of Some α-Hydroxysilanes to Silyl Ethers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTIsomerism of Some α-Hydroxysilanes to Silyl EthersA. G. BrookCite this: J. Am. Chem. Soc. 1958, 80, 8, 1886–1889Publication Date (Print):April 1, 1958Publication History Published online1 May 2002Published inissue 1 April 1958https://doi.org/10.1021/ja01541a026RIGHTS & PERMI…
The Electrical Conductivity and Thermoelectric Power of Bismuth Telluride
The electrical conductivity and thermoelectric power of the semiconductor Bi 2 Te 3 have been measured between 150°K and 300°K. n-type and p-type samples with a wide range of carrier concentration have been included. Most samples have shown extrinsic conduction and have been partially degenerate over at least part of…
Stress-Strain Relationships in Yarns Subjected to Rapid Impact Loading
The behavior of an infinitely long flexible filament after transverse impact is treated theoretically. The filament is assumed to have a tension-strain curve which is always concave downwards and to have no short time creep or stress relaxation effects. Under most conditions the impact initiates a variable strain that…
The Application of Thermoanalytical Techniques to Reaction Kinetics: The Thermogravimetric Evaluation of the Kinetics of the Decomposition of Calcium Oxalate Monohydrate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Application of Thermoanalytical Techniques to Reaction Kinetics: The Thermogravimetric Evaluation of the Kinetics of the Decomposition of Calcium Oxalate MonohydrateEli S. Freeman and Benjamin CarrollCite this: J. Phys. Chem. 1958, 62, 4, 394–397Publication Date (Print):…
Araldite as an Embedding Medium for Electron Microscopy
Epoxy resins are suitable media for embedding for electron microscopy, as they set uniformly with virtually no shrinkage. A mixture of araldite epoxy resins has been developed which is soluble in ethanol, and which yields a block of the required hardness for thin sectioning. The critical modifications to the conventio…
Temperature Dependence of Ferromagnetic Anisotropy
The temperature dependence of the crystalline anisotropy constants of iron, cobalt, and nickel is discussed. It is shown that Zener's result for iron (i.e., the first anisotropy constant varies as the tenth power of the magnetization) also may be derived from molecular field theory. In cobalt a satisfactory agreement…
Band Structure and Cohesive Energy of Potassium Chloride
The band structure of crystalline KCl has been calculated in an LCAO (linear combination of atomic orbitals) approximation. Interactions between free-ion Hartree-Fock functions are calculated directly from molecular-type integrals without reducing exchange interactions to an exchange potential. The structure of the fi…
Primary photoprocesses in quinones and dyes I. Spectroscopic detection of intermediates
Abstract The flash photolysis of many quinones in solution produces a number of transient intermediates, each with its characteristic absorption spectrum. A preliminary study of these showed that the appearance of intermediates is clearly related to the efficiency of the quinone as a photosensitizer. A detailed study…
A least-squares analysis of the diffuse X-ray scattering from carbons
The theoretical x-ray intensities scattered from perfectly regular, condensed, aromatic molecules of various sizes have been presented previously in numerical form. A matrix method is described whereby a linear combination of such theoretical curves may be fitted to the observed intensities with minimum total square e…
Complex alloy structures regarded as sphere packings. I. Definitions and basic principles
Complex alloy structures, particularly those of transition metals, are considered as determined by the geometricnl requirements for sphere packing. A characteristic of the class of structures discussed is that tetrahedral groupings of atoms occur everywhere in the structure--alternatively stated, coordination polyhedr…
Mastication of Rubber. VI. Viscosity and Molecular Weight Relationships for Natural Rubber after Cold Mastication
Abstract Values of limiting viscosity number, Huggins' interaction constant, k ′, osmostic molecular weight and Flory-Huggins' constant, μ, of masticated and unmasticated rubber have been compared. A calibration of limiting viscosity against molecular weight has been obtained for masticated rubber, but one is not avai…
Effects of High Burnup on Natural Uranium
Results are given from experiments in which unrestrained specimens of unalloyed natural uranium were irradiated to total atom burnups ranging up to 1.82% (15,500 Mwd/T) at temperatures from 50° to 220°C. A few specimens were also thermally cycled. The specimens represented material with four different fabrication hist…
Thermoelectric Effects
This paper is a review of thermoelectric effects in solids, with emphasis on the practical application of these effects. The basic principles of thermoelectricity are reviewed, the present status of the problem and recent achievements are outlined in terms of specific practical applications, and the present status of…
THE SYSTEM LITHIUM NITRATE–ETHANOL–WATER AND ITS COMPONENT BINARY SYSTEMS
The system lithium nitrate–water has been investigated by thermal analysis and by X-ray powder diffraction studies. No trace of the hemihydrate reported by Donnan and Burt was found. The X-ray powder diffraction pattern of LiNO 3 .3H 2 O has been obtained.The equilibrium diagram of the system ethanol–water shows an in…
Cube Texture in Body Centered Magnetic Alloys
Cube oriented, (100) [001], iron silicon alloys have been prepared in thickness ranging from 0.8 mil to 11.0 mils. Both ac and dc magnetic properties are given for the alloys. The data show that comparable properties to commercial singly oriented steel of the (110) [001] texture are obtained both parallel and perpendi…
A Method of Measuring Poisson's Ratio of Fibers1
An apparatus is described whereby Poisson's ratio may be measured for fibers whose diameter is approximately 250μ. The apparatus is used in conjunction with an Instron Testing Machine so that stress vs. strain measurements can be made at the same time Poisson's ratio vs. strain measurements are made. The measurements…