Drying sizing system
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Firing kilns with low-grade coals
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PLASTRON RESPIRATION IN AQUATIC INSECTS
SUMMARY The closed tracheal system of the aquatic larvae of insects, together with the typical tracheal gill, can only function if the tracheal tubes themselves have sufficient resistance to compression. The work of Ege showed conclusively that the ‘air stores’ of many aquatic insects can, if they are in communication…
Ferroelectricity, Domain Structure, and Phase Transitions of Barium Titanate
A summarizing account is given of the research on barium titanate in progress at the Laboratory for Insulation Research at M. I. T. since 1943. The investigations have led to an understanding of the mechanism of ferroelectricity in the titanates and to discoveries such as the piezoelectric effect in the ceramics and t…
Hemolytic Activity of Some Nonionic Surface-active Agents
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The Calculation of Magnetic Lens Fields by Relaxation Methods
The field and lens constants are calculated for two typical magnetic lenses as used in electron microscopes, using the relaxation method developed by Southwell for the solution of potential problems The results are compared with those based on simple analytic approximations to the field distribution in the work of Gla…
Formation of a Sulfate Glass
The highly symmetrical SO 4 2 ‐ group is not easily distorted and consequently does not lend itself readily to glass formation, Vitreous sulfates of cations of the noble‐gas type are unknown. However, by combining a large cation with a weak positive force field (K + ) with the strong field of the proton (H + ), it bec…
Emulsion Polymerization with Ultrasonic Vibration
Emulsion-type polymerization reactions have been accelerated by irradiation with ultrasonic energy. A magnetostriction oscillator at 15 kc gave essentially the same results as a piezoelectric oscillator at 500 kc. The rate of formation of polystyrene was doubled and higher final yields obtained using about 0.03 watt o…
Über Dichte und Gitterbau der Verbindungen Mg2Pb, Mg2Sn und Mg2Ge
Abstract Dichtemessungen und Röntgenuntersuchungen an Mg 2 Pb und Mg 2 Sn ergeben eine Anomalie in der Art, daß der röntgenographisch berechnete Wert der Dichte kleiner als der pyknometrisch gemessene ist. Mg 2 Ge zeigt diese Anomalie nicht mehr. Die Zusammensetzung der Verbindungen ist exakt formelgemäß. Bei Mg 2 Pb…
Equation of State for High Polymers
In a former paper the authors suggested the following equation of state, (P+π)(V−ω)=RT, where π is the internal pressure (or cohesive energy density) and ω is the volume at absolute zero. It was found that this equation was in good agreement with data on the thermal expansivity and isothermal compressibility of polyst…
Use of a Glass Edge in Thin Sectioning for Electron Microscopy.
The use of a steel microtome knife in cutting sections for electron microscopy has certain disadvantages, especially in the achievement and maintenance of a sufficiently sharp edge, which involve a considerable expenditure of time. The search for a knife material having homogeneity and hardness without excessive britt…
The Vapor Pressure of Inorganic Substances. II. B2O31
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Vapor Pressure of Inorganic Substances. II. B2O31Rudolph Speiser, Sam Naiditch, and Herrick L. JohnstonCite this: J. Am. Chem. Soc. 1950, 72, 6, 2578–2580Publication Date (Print):June 1, 1950Publication History Published online1 May 2002Published inissue 1 June 1950https…
Polymorphism of Calcium Orthosilicate
Therecentobservation of orthorhombic α'‐Ca 2 Si0 4 (bredigite) at all temperatures between about 850° and 1450°C. leads to a rational interpretation of the polymorphism of this substance, which is very satisfactory from the crystal‐chemical point of view. The so‐called β phase, of as yet unknown, complex structure, ex…
The Penetration of Cellulose Fibers.
ADVERTISEMENT RETURN TO ISSUEArticleNEXTThe Penetration of Cellulose Fibers.Alfred J. Stamm and Harold. TarkowCite this: J. Phys. Chem. 1950, 54, 6, 745–753Publication Date (Print):June 1, 1950Publication History Published online1 May 2002Published inissue 1 June 1950https://doi.org/10.1021/j150480a001RIGHTS & PERMISS…
The Gelation of Sodium Silicate. Effect of Sulfuric Acid, Hydrochloric Acid, Ammonium Sulfate, and Sodium Aluminate.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThe Gelation of Sodium Silicate. Effect of Sulfuric Acid, Hydrochloric Acid, Ammonium Sulfate, and Sodium Aluminate.Reynold C. Merrill and Robert W. SpencerCite this: J. Phys. Chem. 1950, 54, 6, 806–812Publication Date (Print):June 1, 1950Publication History Published online…
Crystallinity of Cellulose and Its Significance for the Fiber Properties
The subject of this paper is treated mainly from the standpoint of cotton cellulose. The concept of crystallinity is discussed not simply in the narrow sense of degree of crystallinity but in the broader sense, which involves the whole fine structure of cellulose. With respect to crystallinity in the latter sense, the…