Participación de la SOFIM en la modernización de la industria cerámica
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Máquina para la fabricación de bloques
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Cementos bajos en cal
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Nueva grúa automóvil
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Fabricación de cementos para albañilería
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An Investigation of the Mechanical Properties of Materials at very High Rates of Loading
A method of determining the stress-strain relation of materials when stresses are applied for times of the order of 20 microseconds is described. The apparatus employed was a modification of the Hopkinson pressure bar, and detonators were used to produce large transient stresses. Thin specimens of rubbers, plastics an…
The Dielectric Properties of Barium Titanate at Low Temperatures
The complex dielectric constatn of ceramic barium titanate has been measured as a function of temperature from 300\ifmmode^\circ\else\textdegree\fi{}K down to 2.8\ifmmode^\circ\else\textdegree\fi{}K. The large value of the slope of the real part of the dielectric constant, ${K}^{\ensuremath{'}}$, versus temperature cu…
Domain Structures and Phase Transitions in Barium Titanate
The arrangements of domains that arise in single crystals of barium titanate in the ferroelectric tetragonal phase have been studied in detail. The domains are the results of tetragonal (101) twinning, and appear by the formation of wedge-shaped laminar domains between two converging (101) twin planes. The distance of…
Detection of Antiferromagnetism by Neutron Diffraction
T necessary conditions for the existence of ferromagnetism are: (1) the atoms must have a net magnetic moment due to an unfilled electron shell, and (2) the exchange integral / relating to the exchange of electrons between neighboring atoms must be positive. This last condition is required in order that spin states of…
The Electric and Optical Behavior of BaTiO3Single-Domain Crystals
The dielectric constants, the spontaneous polarization, and the optical properties of BaTi${\mathrm{O}}_{3}$ single-domain crystals have been measured as a function of temperature. It is shown that the deformation of the crystal in the tetragonal state is proportional to the square of the spontaneous polarization, in…
Transient Nutations in Nuclear Magnetic Resonance
Transient nutations of the resultant nuclear magnetic moment vector are set up by applying radiofrequency power in the form of pulses in the neighborhood of resonance ($\ensuremath{\omega}=\ensuremath{\gamma}{H}_{0}$). The nutations have an initial amplitude depending on the state of magnetization at the start of a pu…
Crystal Statistics. II. Partition Function Evaluated by Spinor Analysis
The partition function for a two-dimensional binary lattice is evaluated in terms of the eigenvalues of the ${2}^{n}$-dimensional matrix V characteristic for the lattice. Use is made of the properties of the ${2}^{n}$-dimensional "spin"-representation of the group of rotations in $2n$-dimensions. In consequence of the…
Interstitial Atomic Diffusion Coefficients
An attempt is made to interpret the temperature independent factor ${D}_{0}$ of the previously determined diffusion coefficients of interstitial solute atoms in metals. The primary uncertainty in the value of ${D}_{0}$ given by the standard reaction rate theory resides in an entropy factor $\mathrm{exp}(\frac{\ensurem…
The thermal degradation of polyvinyl compounds. I. A new type of molecular still
Abstract A survey of depolymerization reactions has been made and the importance of the degradation emphasized in addition polymerization especially at high temperatures. In order to follow the course of the thermal degradation it is necessary to remove rapidly and measure the amount of monomer produced. In addition i…
The Ultraviolet Absorption and Luminescence of Decaborane
The ultraviolet absorption spectrum of decaborane in cyclohexane shows a broad absorption with a maximum molecular extinction coefficient of 3200±100A at wave-length 2720±50A. The luminescence of decaborane dissolved in a glass at 77°K shows a continuous fluorescence extending from 3630±50A to about 6000A with a broad…
A Low Temperature Single Crystal X-Ray Diffraction Technique
A low temperature x-ray diffraction technique, especially suitable to single crystal work, is described. Crystals are grown in glass capillaries on the x-ray camera. Position and orientation are determined with the aid of a polarizing microscope on the apparatus. A special specimen holder is used which prevents moistu…
Quantitative Measurements of the Elastic Properties of the Skin and Subcutaneous Tissue in Young and Old Individuals
This is a condensation of a paper presented at the Institute on Problems of aging at Washington University, St. Louis, April 11-12, 1949, as part of the session on the biology of aging. Using an apparatus designed by schade in 1912 Drs. Kirk and Kvorning conducted a series of investigations to determine the elastic pr…
The structure of Bolivian crocidolite
Bolivian crocidolite, a fibrous amphibole, is shown to contain fibres approximating to single crystals. The structure, which is determined by standard methods leading to a Fourier projection on (001), is shown to be generally similar to that of tremolite. The more precise determination reveals certain departures from…
Characterization of Heavy Metal Soaps by X-Ray Diffraction
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of Heavy Metal Soaps by X-Ray DiffractionR. D. Vold and G. S. HattiangdiCite this: Ind. Eng. Chem. 1949, 41, 10, 2311–2320Publication Date (Print):October 1, 1949Publication History Published online1 May 2002Published inissue 1 October 1949https://pubs.acs.o…