The Growth of Crystals
Tharty-second Guthrzc Lecture, delzvwed ow 4 %ne 1948N choosing a subject for the Guthrie Lecture it seems important to consider.the use to which such a lecture can be put.There is so much published now
Materials Literature
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Organosilicon Polymers. IV. Infrared Studies on Cyclic Disubstituted Siloxanes1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganosilicon Polymers. IV. Infrared Studies on Cyclic Disubstituted Siloxanes1C. W. Young, P. C. Servais, C. C. Currie, and M. J. HunterCite this: J. Am. Chem. Soc. 1948, 70, 11, 3758–3764Publication Date (Print):November 1, 1948Publication History Published online1 May 200…
The Vapor Pressures of Some Alkali Halides
The vapor pressures of six alkali halides, NaBr, NaI, KI, CsCl, CsBr, and CsI, have been measured in the range from about 10−4-mm to 0.1-mm pressure. The measurements were made by the diffusion method, using an oxygen-coated tungsten filament as detector.
Chemorheology of Polysulfide Rubbers
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChemorheology of Polysulfide RubbersMarcos Mochulsky and Arthur V. TobolskyCite this: Ind. Eng. Chem. 1948, 40, 11, 2155–2163Publication Date (Print):November 1, 1948Publication History Published online1 May 2002Published inissue 1 November 1948https://pubs.acs.org/doi/10.10…
The Relationship Between the Structural Geometry of a Textile Fabric and Its Physical Properties
This is the first in a series of papers to be issued by the Quartermaster Corps discussing the importance of fabric geometry in the development of more utilitarian and serviceable textile materials. It is a literature review which shows the relationship between the structural char acteristics of fabrics and various fu…
Electrostrictive Effect in Barium Titanate Ceramics
When a direct current bias is applied to a multicrystalline barium titanate ceramic, an alternating voltage can excite resonances in the ceramic. Four modes of motion have been excited---a longitudinal mode at right angles to the applied field, a radial mode of a circular plate at right angles to the applied field, a…
THE STRUCTURE OF HUMAN SKIN COLLAGEN AS STUDIED WITH THE ELECTRON MICROSCOPE
1. The structure of the collagen fibrils of normal human skin corium has been investigated with the electron microscope. 2. Under the conditions of observation the fibrils ranged in width from about 700 to 1,400 A with 1,000 A as the value occurring most frequently. They showed little tendency to fray longitudinally a…
The buoyancy of plankton diatoms: a problem of cell physiology
Abstract Observations on pure cultures of diatoms and the results of centrifuge experiments showed that under optimal conditions the vegetative cells have the same specific gravity as sea water. The specific gravity of resting spores is significantly higher than that of sea water. Hence the specific gravity of the cel…
Some Systems of Carbon Halides with Dioxane, Pyridine and Cyclohexane
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSome Systems of Carbon Halides with Dioxane, Pyridine and CyclohexaneS. M. Scholastica Kennard and P. A. McCuskerCite this: J. Am. Chem. Soc. 1948, 70, 10, 3375–3377Publication Date (Print):October 1, 1948Publication History Published online1 May 2002Published inissue 1 Octo…
Effect of temperature on the volume of leather and collagen in water
The coefficients of cubical expansion of 10 tannages of leather and tendon collagen have been measured by using water as the confinin g liquid. The results, calculated for dry leather of density 1.560 g/ml, show t hat an average coefficient of 540 X 10-6;00 applies for collagen and all leathers except chrome-vegetable…
Adhesion of high polymers to cellulose. Influence of structure, polarity, and tack temperature
Abstract It has been demonstrated that the adhesion of high polymers to cellulose is a function of tack temperatures and dielectric constants, ϵ, of the polymers and of dipole moments, μ, of polar groups. A plot of tack temperature versus mirror image force , μ 1 μ 2 /,of copolymers gives an area of adhesion bounded b…
Twinning in Tetragonal Alloys of Copper and Manganese
Studies have been made of an alloy 88 percent Mn-12 percent Cu. This alloy when annealed at 925°C and quenched to room temperature has a tetragonal structure of axial ratio 0.97. It has been suggested that such a structure would show twinning along the 101 and 011 planes. Verification of this suggestion is presented.
Elastoviscous properties of polyisobutylene. I. Relaxation of stress in whole polymer of different molecular weights at elevated temperatures
Abstract The relaxation of stress in polyisobutylene whole polymer of different average molecular weights has been investigated over the temperature range 30–100°C., and at different elongations. The shape of the relaxation curve is independent of elongation in a range of low elongations; above this range there is a g…
Corrosion of Metals in Red Fuming Nitric Acid and in Mixed Acid
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCorrosion of Metals in Red Fuming Nitric Acid and in Mixed AcidNathan Kaplan and Rodney J. AndrusCite this: Ind. Eng. Chem. 1948, 40, 10, 1946–1947Publication Date (Print):October 1, 1948Publication History Published online1 May 2002Published inissue 1 October 1948https://do…
Collisions through liquid films
When impact occurs between clean metal surfaces, plastic flow of the metal usually takes place at the points of real contact, so that the pressures developed are as high as the dynamic yield pressure of the metal concerned. Early experiment show that if the surfaces are covered with a thin film of a highly viscous liq…
Scattering of Ultrasonic Radiation in Polycrystalline Metals
A method for measuring absorption and velocity of ultrasonic radiation in the frequency range from 5 to 100 Mc by use of pulse techniques is described. Results of such measurements performed on polycrystalline magnesium and aluminum as a function of frequency and grain size show that the absorption coefficient varies…
Polymer constitution and fiber properties
Abstract The chemical structure of a large number of linear condensation polymers is correlated with their ability to assume a polycrystalline form possessing the right degree of thermal stability, and with the possession of fiber‐forming properties. Certain structures lead to the absence of crystallinity and of fiber…
Basic Aspects of X-Ray Absorption in Quantitative Diffraction Analysis of Powder Mixtures
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTBasic Aspects of X-Ray Absorption in Quantitative Diffraction Analysis of Powder MixturesLeroy. Alexander and H. P. KlugCite this: Anal. Chem. 1948, 20, 10, 886–889Publication Date (Print):October 1, 1948Publication History Published online1 May 2002Published inissue 1 Octob…
A Numerical Fourier-analysis Method for the Correction of Widths and Shapes of Lines on X-ray Powder Photographs
A method is derived, using Fourier analysis, for finding the corrected distribution of intensity across an x-ray diffraction line, and the procedure is illustrated by a numerical example. The method may also be of use in spectrum analysis and statistical problems.
The Nature of the Glassy State and the Behavior of Liquids at Low Temperatures.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Nature of the Glassy State and the Behavior of Liquids at Low Temperatures.Walter. KauzmannCite this: Chem. Rev. 1948, 43, 2, 219–256Publication Date (Print):October 1, 1948Publication History Published online1 May 2002Published inissue 1 October 1948https://pubs.acs.org…