Recent research on portland cement in Russia
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Materials Literature
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Fly ash as a pozzolan
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A standard for concrete aggregates
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Practical aspects of instrumentation
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New lab for consolidated research
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Sands for plasters, mortars and external renderings
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New concept of rotary kiln plant
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Cement production in Japan
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Drying sizing system
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Firing kilns with low-grade coals
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Wet or dry masonry saw
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Von wesen der kohlenstaubflamme
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The extraction of cement-kiln dust by cyolones
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Calcination of carbonate sludge
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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…