Infrared Dichroism in the 13.8μ Band of n-C36H74 Single Crystals and Polyethylene.
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XXXIV. The correction of elasticity measurements on slightly anisotropic materials
Summary Expressions are derived for the average elastic constants of a poly-crystalline bar, having circular symmetry about its principal axis, and composed of material with cubic crystal symmetry. It is shown that the differences between these and the corresponding constants obtained for a material with completely ra…
Theory of Antiferromagnetic Resonance in CuCl2-2H2O
After giving a short review of Nagamiya-Yosida’s theory of antiferromagnetic resonance, it is shown that this theory is equivalent to Gorter-Ubbink’s at absolute zero, so far as the external field H employed in the former is replaced by H′ defined by 2Hx′=gaHx, etc. and the parallel and perpendicular susceptibilities…
Elastic properties of polvinyl chloride gels
Abstract Young's moduli are measured by a simple compression method on plasticized polyvinyl chloride (Vinylite VYNW) compounds containing from 5 to 100% polymer covering a range of approximately seven orders of magnitude in modulus. By comparing values obtained at different temperatures, it is shown that the 60‐secon…
The Mechanism of Secondary Electron Emission
It is shown that a simple theory based on the constant energy loss per unit path length of primary electrons accounts quantitatively for the variation of secondary electron emission yield below its maximum value. The theory can be extended formally to include a Bethe-type energy loss at high primary energies. An attem…
The Heats of Hydration of Tricalcium Silicate and β-Dicalcium Silicate
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Heats of Hydration of Tricalcium Silicate and β-Dicalcium SilicateStephen Brunauer, J. O. Hayes, and W. E. HassCite this: J. Phys. Chem. 1954, 58, 3, 279–285Publication Date (Print):March 1, 1954Publication History Published online1 May 2002Published inissue 1 March 1954…
Pyrolysis of Graphitic Acid
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPyrolysis of Graphitic AcidEitaro MatuyamaCite this: J. Phys. Chem. 1954, 58, 3, 215–219Publication Date (Print):March 1, 1954Publication History Published online1 May 2002Published inissue 1 March 1954https://pubs.acs.org/doi/10.1021/j150513a006https://doi.org/10.1021/j1505…
Stability of Refractories in Liquid Metals
Present technological developments are making more extensive use of liquid metals as heat‐transfer agents. Their stable and relatively noncorrosive character makes them especially adaptable for high‐temperature applications. The compatibility of various liquid metals with refractories has been investigated in the past…
The Lattice Component of the Thermal Conductivity of Metals and Alloys
Makinson's (1938) theory of the lattice component of the thermal conductivity of metals and alloys, when limited at low temperatures by interaction with the conduction electrons, is re-examined, and the magnitude of the lattice conductivity is related to the electronic thermal conductivity at low temperatures, thus av…
An X‐ray study of the decomposition product of the ethylamine‐cellulose complex
Abstract The present paper reports the results of a study of the decomposition product of the ethylamine‐cellulose complex obtained from cotton cellulose. It is shown that the cotton remaining after removal of ethylamine by distillation possesses a crystalline component identical with the ammonia‐cellulose decompositi…
The Zirconia‐Titania System
A phase diagram for the zirconia‐titania system is proposed, based on the existence of a hitherto unreported compound, ZrTiOd. Thermal‐expansion and X‐ray diffraction experiments were performed on three series of specimens heated at 980°, 1370°, and 176O°C., respectively.
The Lattice Constants of the Alkali Borohydrides and the Low-Temperature Phase of Sodium Borohydride
The lattice constants of sodium, potassium, rubidium, and cesium borohydrides have been measured at 25.0°C as 6.1635±0.0005, 6.7272±0.0005, 7.029±0.001, and 7.419±0.001A, respectively. All four crystals are face-centered cubic and have the sodium chloride structure. Below the transition point (—83°C) sodium borohydrid…
Kraftkonstante und Strukturchemie. V. Struktur der Sauerstoffsäuren
Abstract Es werden die Kraftkonstanten und Bindungsgrade einer Reihe von Sauerstoffsäuren bzw. ihrer Ionen berechnet. Aus den Bindungsgraden lassen sich Strukturformeln ableiten. Im Gegensatz zu den Ansichten der Oktett‐Theorie sind in den meisten Verbindungen Doppelbindungsstrukturen beteiligt. In den Ionen XO n sind…
Warp Knitting Technology
(1954). Warp Knitting Technology. Journal of the Textile Institute Proceedings: Vol. 45, No. 3, pp. P108-P108.
Nuclear Quadrupole Resonance
Nuclear quadrupole resonance is a recently developed branch of radio-frequency spectroscopy which is concerned with magnetic resonance absorption in crystals. This absorption is due to reorientation of the nonspherical atomic nuclei against crystalline electric fields. Related phenomena in isolated molecules are brief…
Low-Temperature Internal Friction and Elasticity Effects in Vitreous Silica
Near 35°K the internal friction of vitreous silica reaches a peak value which increases with frequency. The temperature curves of the torsion and Young's moduli are concave upward with minima near 65°K and are independent of frequency. These effects are reversible with temperature. Their cause cannot be the usual type…
The hydrated calcium silicates riversideite, tobermorite, and plombierite
In a recent paper Taylor has shown that three distinct hydration levels exist within the ‘calcium silicate hydrate (l)’ group of artificial preparations (Taylor, 1953 a , p. 168). The individual hydrates may be distinguished from the position of the 002 reflection in X-ray powder photographs. The d spacings correspond…
Analysis of Plastic Deformation in a Steel Cylinder Striking a Rigid Target
Abstract The G. I. Taylor dynamic compression test consists of firing a cylinder of the material to be tested at a target of hardened armor plate, and deducing the dynamic yield stress from the resulting deformation. In the interpretation of the results, interest is concentrated on the wave front of initial plastic st…
Nonlinearity in the Dynamic Properties of Vulcanized Rubber Compounds
Abstract Measurements are described of the dynamic properties of rubber, loaded with various amounts and types of filler, when subjected to mechanical vibration in simple shear at amplitudes from 0 to 3 per cent shear in the frequency range 20 to 120 c.p.s. The decrease of dynamic modulus with increasing amplitude is…
Optical Properties of Silicon Monoxide in the Wavelength Region from 024 to 140 Microns*
Using evaporation conditions adjusted for the deposition of true silicon monoxide, a series of films ranging in thickness from 0.03 to 10 microns was prepared on fused quartz, glass, rock salt, and highly reflecting aluminum surfaces. The optical constants of the films were computed in the wavelength region from 0.24…