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With a given specification of the space-charge density and velocity functions for a general electron-tube system, the balance of instantaneous rates of energy change between the space and the external circuits has been derived here from Green's theorem. It is shown that the external currents can be completely accounte…
The effect of order and disorder upon the breakdown characteristics of ionic materials has been investigated. While the dielectric strength of the alkali-halide crystals increases steeply with temperature in the lower temperature range, the trend in glasses is found to be the opposite. A comparison of the characterist…
Abstract The effective susceptibility (that is, the magnetic moment divided by the external magnetic field) of a paramagnetic powder loosely packed into an ellipsoidal container has been measured against the vapour pressure of liquid helium, and hence, using the results of the preceding paper, against the susceptibili…
When a sinusoidal voltage is applied to a condenser containing an absorptive dielectric the absorption current can be split up into two components, one in phase and another in quadrature with the voltage. In the present paper, direct relations, suitable for numerical calculation, are established between these componen…
To learn more about the identification of crystalline materials, preferred orientations, particle sizes, strains, and structure randomness, x-ray diffraction is used. Here both basic principles and working techniques are described.
Random layer lattice structures are considered which consist of layers arranged parallel and equidistant, but random in translation parallel to the layer, and rotation about the normal. We call $a$ and $b$ the axes in the layer, and $c$ the axis normal to the layer. In this notation there will be crystalline reflectio…
The long wave-length, polar lattice vibrations of alkali halide crystals are discussed without making any specific assumptions about the detailed interactions between the ions. This is made possible by the introduction of the effective charge, ${e}^{*}$, of an ion defined as follows: All of the positive ions in a crys…
A bstract The sodium disilicate‐barium disilicate join of the ternary system, Na 2 O‐BaO‐SiO 2 , has been studied by means of the quenching method, and the phase‐equilibrium diagram has been determined. The two compounds form a binary system without intermediate compounds and without appreciable solid solution. The eu…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation W. James Lyons; Crystal Density of Native Cellulose. J. Chem. Phys. 1 April 1941; 9 (4): 377–378.…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Review of Some Recent X-ray Work on Protein Crystals.Dorothy. CrowfootCite this: Chem. Rev. 1941, 28, 2, 215–228Publication Date (Print):April 1, 1941Publication History Published online1 May 2002Published inissue 1 April 1941https://pubs.acs.org/doi/10.1021/cr60090a002htt…
Summary A summary of the results obtained with alloys quenched from temperatures between 500° C. and 800° C. is contained at the end of Section 2 of the paper. Measurements were made to determine the lattice parameters of the constituents of alloys in the two-phase region. The alloys were subjected to different heat t…
INVESTIGATIONS in progress in this Laboratory on the fate of sulphonamide drugs in the animal body indicate that these are oxidized to a small extent with the production of phenolic substances which may be excreted in conjugation with sulphuric and glucuronic acids [cf.. Shelswell & Williams, 1940; In addition to this…
A theory of dielectric loss of polar polymers at high dilution in a nonpolar plasticizer is developed. The theory leads to a broad distribution in relaxation times, associated with the internal rotatory Brownian motion of the hydrocarbon chain. An approximate relation between the degree of polymerization, the frequenc…
The nature of internal discharges in actual insulation and also on model circuits exposed to alternating voltages is studied by means of a special oscillographic bridge equipment. A theory of the occurrence of these discharges is developed and is shown to agree with the oscillographic observations and to give correctl…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystallization of Vulcanized RubberNorman Bekkedahl and Lawrence A. WoodCite this: Ind. Eng. Chem. 1941, 33, 3, 381–384Publication Date (Print):March 1, 1941Publication History Published online1 May 2002Published inissue 1 March 1941https://pubs.acs.org/doi/10.1021/ie50375a…
This paper describes theoretical and experimental work on the dielectric loss of films of insulating liquids so thin that the motion of ions under an alternating field is limited by the boundaries of the film. Films of this thickness normally occur in porous, impregnated insulation, and lead to a dielectric loss angle…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolymeric Methyl Silicon Oxides1E. G. Rochow and W. F. GilliamCite this: J. Am. Chem. Soc. 1941, 63, 3, 798–800Publication Date (Print):March 1, 1941Publication History Published online1 May 2002Published inissue 1 March 1941https://pubs.acs.org/doi/10.1021/ja01848a046https:…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Solubilization of Water-insoluble Dye in Dilute Solutions of Aqueous Detergents*J. W. McBain, R. C. Merrill Jr., and J. R. VinogradCite this: J. Am. Chem. Soc. 1941, 63, 3, 670–676Publication Date (Print):March 1, 1941Publication History Published online1 May 2002Publish…
When wool fibres (or hairs) are rubbed together, the sign of the tribo-electric charges produced depends upon the sense of the rubbing. This effect is due to the cuticle cells of the fibre, which are piezo- and pyro-electric. Pyro-electricity is absent or weak in the cortical cells.
An important mechanism involved in the variation of the magnetization of ferromagnets near saturation is the rotation of the magnetization vector under the combined influence of the magnetic field and crystalline anisotropy torques. The effect of this mechanism in polycrystalline specimens has been calculated by Akulo…