Volume changes in small concrete clinders during freezing and thawing
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Old fashioned cements vs. modern cements
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New type concrete pipe testing machine
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Readers discuss on cements, concrete and agregates
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Investigations of lightweight agregates from clays and shales
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The importance of the size of building units
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Pneumatic vibrating table
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Modernising the works
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X-Ray Measurement of Order in Single Crystals of Cu3Au
X-ray diffraction methods have been used to measure long- and short-range order parameters for single crystals of the alloy Cu3Au held at elevated temperatures. It is shown that short-range order parameters may be obtained by a three-dimensional Fourier analysis of the ``scattering power'' for the diffuse background s…
Statistical Mechanics of Swelling of Network Structures
Inaccuracies in previously published theories dealing with the swelling of network polymers in solvents are pointed out. The treatment of Flory and Rehner, based on the tetrahedral model, is overly restrictive and leads to an entropy of swelling which is too small. A more recent treatment of Kuhn, Pasternak, and Kuhn…
One-dimensional dislocations - III. Influence of the second harmonic term in the potential representation, on the properties of the model
Abstract In the previous one-dimensional dislocation model, a single sinusoidal term was taken to represent the potential energy of the deposit as a function of its position on the substrate. In this model a more general representation of the potential, containing a second harmonic term as well, is used, and it is sho…
The kinetics of the polymerization of sarcosine carbonic anhydride
Abstract The polymerization of carbonic anhydrides, a reaction important but>u as a preparative method for the synthesis of polypeptides and as an example of a less familiar type of polymerization, has been studied in detail using sarcosine carbonic anhydride (I). The propagation reaction has been shown to invo…
Crystal chemical studies of the 5f-series of elements. XII. New compounds representing known structure types
4) Evidence on the cleavage patterns seems to prove that this optical effect is directly related to a physically lamellar structure.
The design of a capacitor voltage transformer
It is well known that voltage transformers of the usual electromagnetic type constitute a very costly item in high-voltage systems. Considerable savings could be effected by the use of voltage transformers of the capacitor type if their design could be perfected to give sufficient accuracy, i.e. if their ratio errors…
Carbonation of Aqueous Suspensions Containing Magnesium Oxides or Hydroxides
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCarbonation of Aqueous Suspensions Containing Magnesium Oxides or HydroxidesRobert L. Evans and Hillary W. St. ClairCite this: Ind. Eng. Chem. 1949, 41, 12, 2814–2817Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 De…
Microgel, a New Macromolecule. Relation to Sol and Gel as Structural Elements of Synthetic Rubber
Abstract In connection with the rubber crisis of the war, useful fundamental controls and improvements of quality of synthetic rubber which would fit in with current engineering were urgently needed. Variations in the solubility of butadiene polymers and copolymers had been noted by many rubber researchers seemingly t…
Estimation of crystallinity of some polymers from x‐ray intensity measurements
Abstract The paper deals with a tentative plan to extend quantitative x‐ray measurements for determining the degree of crystallinity of polymers (as used earlier in cellulose determinations), to the investigation of rubber, polythene, and a polyamide. Strictly monochromatized copper radiation was used. The results sho…
Rapid Measurement of Cellulose Viscosity by Nitration Methods
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTRapid Measurement of Cellulose Viscosity by Nitration MethodsW. J. Alexander and R. L. MitchellCite this: Anal. Chem. 1949, 21, 12, 1497–1500Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 December 1949https://pubs.a…
Chain Initiation in Styrene Emulsion Polymerization
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTChain Initiation in Styrene Emulsion PolymerizationWendell V. SmithCite this: J. Am. Chem. Soc. 1949, 71, 12, 4077–4082Publication Date (Print):December 1, 1949Publication History Published online1 May 2002Published inissue 1 December 1949https://pubs.acs.org/doi/10.1021/ja0…
On the Theory of the π-Electron System in Porphines
The failure of certain LCAO molecular orbital calculations of the spectrum of porphine is attributed to the incorrect assumption of complete ``aromaticity.'' A division of the π-electron system into non-interacting parts is supported by the fact that the dynamical properties of the divided system, as calculated by the…