Elimination of screen blinding by the application of electrie heat
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Phase Transitions in Solid Solutions of PbZrO3 and PbTiO3 (I) Small Concentrations of PbTiO3
The dielectric, calorimetric and dilatometric measurements have been made on the solid solutions Pb(Zr-Ti)O 3 which contain small amounts of PbTiO 3 less than 10%. Besides the ordinary Curie point near 220°C, the existence of another transition, for example 140°C in Pb(Zr95-Ti5)O 3 , was confirmed. It seems reasonable…
Collisional Perturbation of Spin-Orbital Coupling and the Mechanism of Fluorescence Quenching. A Visual Demonstration of the Perturbation
A yellow color is produced when two colorless pure liquids, α-chloronaphthalene and ethyl iodide, are mixed, although no chemical reaction occurs. Spectroscopic examination reveals that the lowest singlet→triplet absorption band of the naphthalene molecule is greatly enhanced in intensity in the presence of the iodide…
Electrical Conductivity of Silver Sulfide
Mixed electronic and ionic conduction in silver sulfide is examined. The importance of terminal conditions which may affect the ratio of ionic to electronic currents in experimental measurements is emphasized. In particular, either the electronic or ionic components can be completely suppressed. This is the basis of a…
X. Quantitative measurement of preferred orientation in rolled uranium bars
Synopsis The preferred orientation of uranium bars hot-rolled and cold-rolled in the α range has been determined quantitatively by x-ray diffraction using a Geiger counter. It is shown that hot rolling with a slight reduction causes the 010 planes to become strongly and the 110 planes weakly oriented perpendicular to…
Nuclear Reactor Theory
The purpose of this book is to explain the most important physical concepts and mathematical methods commonly used in predicting the behavior of neutrons in nuclear reactors An effort has been made to avoid mathematical complexity that does not lead to a significant increase in physical understanding or is not used in…
Theoretical Spectra of Luminescent Solids
From the potential energy curves for the ground and excited states of the thallium activator in potassium chloride, the absorption spectrum of this phosphor is calculated by direct evaluation of the matrix elements for electronic transitions between the individual vibrational levels of the initial and final states. Ha…
The mechanical behaviour of single crystals of certain face-centred cubic metals
Abstract Single crystal rods of gold, silver and nickel have been prepared from the melt by a modified cooling method. The three metals differ in that the gold is very pure and has no surface contamination; the silver is very pure and the surface normally shows contamination; the nickel is markedly less pure. These th…
One- and Two-Dimensional X-Ray Diffraction
A description is given of the diffraction phenomena from crystals so small in some directions that they may be considered essentially as one- or two-dimensional crystals. The basic theory of x-ray diffraction, in terms of the Ewald construction in the reciprocal lattice, is first presented for the case of a three-dime…
Wax Blooming and Exposure Cracking
Abstract A brief résumé is given of the types of deterioration which cause cracking and similar forms of deterioration in vulcanized rubber and the possible remedies. A study has been made of the development of wax bloom on rubber and some of the factors which affect this development. The waxes constituting the bloo…
Thermodynamic Properties of Fluorapatite, 15 to 1600°K.1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermodynamic Properties of Fluorapatite, 15 to 1600°K.1Edward P. Egan Jr., Zachary T. Wakefield, and Kelly L. ElmoreCite this: J. Am. Chem. Soc. 1951, 73, 12, 5581–5582Publication Date (Print):December 1, 1951Publication History Published online1 May 2002Published inissue 1…
Isolation of unequivocal uroporphyrin III. A further study of turacin
Research Article| December 01 1951 Isolation of unequivocal uroporphyrin III. A further study of turacin R. E. H. Nicholas; R. E. H. Nicholas 1Department of Chemical Pathology, University College Hospital Medical School, London, W.C. 1 Search for other works by this author on: This Site PubMed Google Scholar C. Riming…
The Vibration Spectrum of Rutile
Raman effect data for rutile are evaluated for the force constants. It is shown that quasi-molecules TiO2 are formed with strong Ti–O bonds although every Ti atom is surrounded by 6 O atoms in about equal distances. The main force constants are (in 105 dynes/cm) 1.7 for the Ti–O bond of the quasi-molecules, 0.06 for t…
Experimental Heat Contents of SrO, BaO, CaO, BaCO3 and SrCO3 at High Temperatures. Dissociation Pressures of BaCO3 and SrCO3
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental Heat Contents of SrO, BaO, CaO, BaCO3 and SrCO3 at High Temperatures. Dissociation Pressures of BaCO3 and SrCO3J. J. LanderCite this: J. Am. Chem. Soc. 1951, 73, 12, 5794–5797Publication Date (Print):December 1, 1951Publication History Published online1 May 2002…
Anelasticity of Glass: IV, Correlation of Electrical Strain with Mechanical Strain in Glass
The residual charge and anomalous absorption current reported for certain glasses can be explained by making reference to internal friction peaks caused by the stress diffusion of sodium or potassium ions. When an electrical potential gradient or “electrical stress” is applied to any of these glasses, the “induced ele…
The Heats of Combustion of Magnesium and Aluminum1-3
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heats of Combustion of Magnesium and Aluminum1-3Charles E. Holley Jr. and Elmer J. Huber Jr.Cite this: J. Am. Chem. Soc. 1951, 73, 12, 5577–5579Publication Date (Print):December 1, 1951Publication History Published online1 May 2002Published inissue 1 December 1951https:/…
27—Inter-Fibre Friction
(1951). 27—Inter-Fibre Friction. Journal of the Textile Institute Transactions: Vol. 42, No. 12, pp. T521-T533.
Magnetization Hysteresis Loop Tracer for Long Specimens of Extremely Small Cross Section
An instrument for measurement of the low frequency magnetic properties of thin layers is described. The difference signal from two opposed pick-up coils, one of which contains the sample, is amplified, integrated, and amplified again to cause the vertical deflection of a cathode-ray oscillograph to be proportional to…
Precision Determination of Lattice Parameter, Coefficient of Thermal Expansion and Atomic Weight of Carbon in Diamond1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPrecision Determination of Lattice Parameter, Coefficient of Thermal Expansion and Atomic Weight of Carbon in Diamond1M. E. Straumanis and E. Z. AkaCite this: J. Am. Chem. Soc. 1951, 73, 12, 5643–5646Publication Date (Print):December 1, 1951Publication History Published onli…
The Diffusion of Copper in Cuprous Oxide
Cuprous oxide strips were prepared by the oxidation of copper at 1000°C. The diffusion of radiocopper in this material at 800 to 1050° gave a self-diffusion coefficient, D=0.0436 exp(−36100/RT). Virtually the same D is obtained from experiments in which radiocopper is plated on copper strips, and the distribution of a…