New “Plurajet” shaped blasting charge ready for industry
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Materials Literature
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The analysis of concretes
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Factors influencing concrete strength
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Relative growth and form transformation
Abstract The transformation of form by quantitative distortion of a basic pattern is one aspect of the pattern of form change in general. The study of the relative growth of parts will illuminate this aspect of form change, but not others, such as the complete substitution of one pattern by another, as at metamorphosi…
On the Hall Effect in Ferromagnetics
With precise measurements at magnetic fields well above those required for saturation, it is shown that the Hall electric field per unit current density consists of two distinct parts. Its value averaged between poles is given by ${R}_{0}H+{R}_{1}M$, where $H$ and $M$ are the magnetizing force and average intensity of…
Luminescence and Trapping in Zinc Sulfide Phosphors with and without Copper Activator
A comprehensive study of ZnS:[Zn] and ZnS:[Zn]: Cu phosphors has been carried out with the use of glow curves, phosphorescence emission decay curves, and spectral distribution curves of emission during excitation by 3650A ultraviolet. The principal contributions of the study are (1) glow curves and spectral emission c…
A Small Electron Microscope
A new electron microscope of greatly simplified design has been constructed. The instrument has a resolution of 100 Angstroms, yet is small enough to be mounted on a desk or laboratory table. Magnetic lenses are energized by permanent magnets. An accelerating voltage of 50 kilovolts is varied over a narrow range to pr…
Studies of the viscosity and sedimentation of suspensions Part 1. - The viscosity of suspension of spherical particles
After a brief review of the relative viscosity/volume concentration relationships which have been suggested for suspensions of smooth spheres, the results of new experimental work on rigidly defined systems of methyl-methacrylate spheres suspended in aqueous solutions are described and discussed. It is shown that, alt…
Der Einfluß der Oberflächenbeschaffenheit des Härtungsgutes auf den Abkühlungsvorgang in flüssigen Härtemitteln
Versuche mit Weicheisenkugeln von 19 und 40 mm Dmr. über den Einfluß einer Zunder‐ und Salzschicht auf den Abkühlungsvorgang in einer Salzschmelze, einer hochkonzentrierten Salzlösung, in Ölen und Wasser. Härtungsversuche an Stählen mit 0,58 bis 1,0% C in den gleichen Härtemitteln. Bedeutung der Silberkugel‐Kennkurve.
Thermal Properties of the Compound BPO4
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThermal Properties of the Compound BPO4F. A. Hummel and T. A. KupinskiCite this: J. Am. Chem. Soc. 1950, 72, 11, 5318–5319Publication Date (Print):November 1, 1950Publication History Published online1 May 2002Published inissue 1 November 1950https://doi.org/10.1021/ja01167a5…
Studies on the Schardinger Dextrins. VI. The Molecular Size and Structure of the γ-Dextrin1
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudies on the Schardinger Dextrins. VI. The Molecular Size and Structure of the γ-Dextrin1Dexter French, Doris W. Knapp, and J. H. PazurCite this: J. Am. Chem. Soc. 1950, 72, 11, 5150–5152Publication Date (Print):November 1, 1950Publication History Published online1 May 200…
The Interpretation of the Dependence of Luminescent Efficiency on Activator Concentration
The previously published analysis (see reference 1) of the dependence of efficiency of substitutionally activated inorganic phosphors on activator concentration is generalized to include a wide variety of inorganic phosphors under various types of excitation. In addition to the optical excitation of the activator, the…
On Crazing of Linear High Polymers
The effect of various variables, such as type of stress, stress magnitude, duration of stressing, and environment on the initiation and development of crazing in linear polymers is discussed. The basic nature of crazing is investigated in some detail for polystyrene specimens by means of the light microscope, the elec…
The Influence of a Transverse Magnetic Field on the Conductivity of Thin Metallic Films
The influence of a transverse magnetic field on the conduction properties of thin metallic films, of thickness comparable with the free path of the conduction electrons, is investigated. It is shown that, owing to scattering of electrons at the boundaries of the film, the Hall coefficient is increased, and the electri…
Pozzolnnic activity and insoluble residue
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The problem of deleteriouo particles in aggregates
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Synthetic mica
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Wirtschaftlicher wertvergleich des festigkeiten bei verrmahlung von zementen
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Conveyor system solves loading problem
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Formulas for concrete preaervation
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