Materials Literature
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The theory is developed of the domain structure of ferromagnetic bodies whose smallest dimension is comparable with the thickness of the Weiss domains as found in crystals of ordinary size. Calculations of the domain boundary, magnetic, and anisotropy energies of various domain configurations are given for thin films,…
Progress of Theoretical Physics Vol. 2 No. 1 (1947) pp. 6–24 On the Effect of the Field Reactions on the Interaction of Mesotrons and Nuclear Particles. III Shin-ichirô Tomonaga Progress of Theoretical Physics Vol. 2 No. 2 (1947) pp. 63–70 On the Effect of the Field Reactions on the Interaction of Mesotrons and Nuclea…
Two crystals of the monoclinic sphenoidal class have been found which have modes of vibration with zero temperature coefficients of frequency, and this property together with the high electromechanical coupling and the high $Q'\mathrm{s}$ make it appear probable that these crystals may have considerable use as a subst…
Quantitative x-ray diffraction methods have been used to study the orientation of the cellulose chains and lateral ordering around the long chain axes in various commercial and experimental rayons. Lateral order can vary independently of orientation in cellulose, as is the case with other linear polymers such as the p…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTConversion of Liquid White Phosphorus to Red Phosphorus. I. Kinetics of the Reaction1T. W. DeWitt and Sol SkolnikCite this: J. Am. Chem. Soc. 1946, 68, 11, 2305–2309Publication Date (Print):November 1, 1946Publication History Published online1 May 2002Published inissue 1 Nov…
The methods which have been suggested for correcting x-ray diffraction line widths for geometrical effects are reviewed. Experimental data are presented for two samples of finely-divided NiO and MgO which show that neither the Warren nor the Jones correction method is valid for these particular specimens. A direct Fou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganosilicon Polymers. II. The Open Chain Dimethylsiloxanes with Trimethylsiloxy End Groups1M. J. Hunter, E. L. Warrick, J. F. Hyde, and C. C. CurrieCite this: J. Am. Chem. Soc. 1946, 68, 11, 2284–2290Publication Date (Print):November 1, 1946Publication History Published on…
As the permeability of rubber-like substances to gases stands in relation to the solubility and rate of diffusion of the gases in those materials, these individual values should be known. The permeability of a membrane was measured manometrically and the diffusivity was derived from the time-lag of the permeation. The…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh dielectric constant ceramicsA. von Hippel, R. G. Breckenridge, F. G. Chesley, and Laszlo TiszaCite this: Ind. Eng. Chem. 1946, 38, 11, 1097–1109Publication Date (Print):November 1, 1946Publication History Published online1 May 2002Published inissue 1 November 1946https:…
Values of the carbon-nitrogen single-bond distance in various compounds are of special interest because of the occurrence of this bond in amino acids, proteins and related substances. Numerous electron diffraction studies of gas molecules have yielded values of about 1.47 Å, which are consistent with the usual table o…
The elastic, piezoelectric, and dielectric constants of sodium chlorate (NaCl${\mathrm{O}}_{3}$) and sodium bromate (NaBr${\mathrm{O}}_{3}$) have been measured over a wide temperature range. The value of the piezoelectric constant at room temperature is somewhat larger than that found by Pockels. The value of the Pois…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction between Ferric Oxide and Barium Carbonate in the Solid Phase. Identification of Phases by X-Ray Diffraction1Michael Erchak Jr., I. Fankuchen, and Roland WardCite this: J. Am. Chem. Soc. 1946, 68, 10, 2085–2093Publication Date (Print):October 1, 1946Publication Histo…
A bstract The dielectric constants and dielectric losses of 104 glasses of a wide range of compositions have been measured at 10‐cm. and 3‐cm. wave lengths by the resonating cavity method (3000 and 10,000 megacycles, respectively). By correlating the power‐factor data with the compositions of these glasses, the author…
Abstract Having previously advocated the use of height to define maturity as a basis for legal control of cutting in young stands, the author now develops the use of height as a factor in the measurement and regulation of growing stock. An equation is offered which may prove to have value in defining upper and lower l…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolytetrafluoroethyleneW. E. Hanford and R. M. JoyceCite this: J. Am. Chem. Soc. 1946, 68, 10, 2082–2085Publication Date (Print):October 1, 1946Publication History Published online1 May 2002Published inissue 1 October 1946https://pubs.acs.org/doi/10.1021/ja01214a062https://d…
Failure of adhesive bonds is attributed to boundary stress concentrations. An analysis of the causes of internal-stress concentrations in rigid adhesive layers leads to the conclusion that stress concentrations can be eliminated in many cases by matching the coefficients of thermal expansion of the component parts. A…
Abstract On the basis of the theory discussed in the preceding parts of this series, a method has been devised for determining the temperature coefficient and hence the activation energy of the process responsible for starting the chains in the thermal reaction between hydrogen and oxygen. The results are consistent w…
Abstract When rubber goods are exposed to the agencies which constitute “weather”, they undergo profound changes. The rubber may lose elasticity, it may split or crack, or the surface may take on a crinkled appearance in a wide variety of designs. Figure 1 shows a small selection of such weathered rubbers. The course…
Comparative measurements at large and small distances have been made on the pressure wave from a small underwater explosion. It is shown that: (1) there is a small departure from the $\frac{1}{r}$ law for the peak pressure, (2) there is no detectable change in shape or "spreading" of the pressure wave with propagation…
Abstract The investigation was undertaken in an attempt to establish the fundamental connections between the physical properties of a typical vulcanized rubberlike polymer and its chemical structure. The structural variables to be considered are the molecular weight of the “primary molecules” entering the vulcanizate,…