Der Hochtemperaturofen im Zementlabor
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Materials Literature
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A new test kiln for the cement, limo, magnesite and gypsum industries
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Verbundmüale oder sichtermühle rei Zementuermahlung
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Solutions of Nonelectrolytes
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Size effect variation of the electrical conductivity of metals
Abstract This paper records experiments and theoretical work concerned with the variation of conductivity with size in metals. Experimental results for the conductivity in thin wires of pure sodium of varying diameter in the absence of a magnetic field and also in the presence of longitudinal and transverse magnetic f…
Free Retraction of Elongated Rubbers
Abstract The speed of retraction of the ends of elongated rubber rings relative to each other for a number of elastomers was measured at room temperature by a comparatively simple method. The results, plotted as elongation vs. time curves, indicate that the mechanism of retraction is complicated and cannot be describe…
Investigations in the Field of Rubber Vulcanization. VII. Influence of Organic Accelerators on the Kinetics of Vulcanization and the Properties of Natural-Rubber Vulcanizates
Abstract 1. Vulcanization accelerators change all parameters of the kinetic strength curve during the vulcanization of natural-rubber mixtures with low sulfur contents. 2. Calculation of the kinetic constants of the fundamental vulcanization equation proposed by Dogadkin, Karmin, and Gol'berg shows that vulcanization…
Corrosion of Metals in Fluorine And Hydrofluoric Acid
Experience gained over a period of years in the use of metal equipment for the production and handling of fluorine and for the production and shipment of hydrofluoric acid has resulted in an accumulation of information relative to the behavior of metals under various conditions. None of the common metals or alloys hav…
COUMARONE DEHYDROGENATION WITH N-BROMOSUCCINIMIDE
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCOUMARONE DEHYDROGENATION WITH N-BROMOSUCCINIMIDET. A. Geissman, T. G. Halsall, and Elly HinreinerCite this: J. Am. Chem. Soc. 1950, 72, 9, 4326Publication Date (Print):September 1, 1950Publication History Published online1 May 2002Published inissue 1 September 1950https://d…
Thermal study of some manganese oxide minerals
In the past decade, differential thermal analysis has developed into a very useful mineralogical technique. The theoretical background for this method has been treated by Speil, Berkelhamer, Pask, and Da vies (1945) and has been modified by Kerr and Kulp (1948, 1949). The application of the method to the clay minerals…
Cerium Oxyfluoride and Its Lattice Structure
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation Wolfgang Finkelnburg, Adam Stein; Cerium Oxyfluoride and Its Lattice Structure. J. Chem. Phys. 1…
The Swelling of Cotton in Water
A method is described for comparing microscopically the cross-sectional areas of the same cotton fiber in wet and dry conditions, for evaluation of swelling. Results indicate the change in cross-sectional area of raw cotton fibers to be between 21 % and 34% of the dry area regardless of variety of cotton or degree of…
Self-Diffusion of Sodium in Sodium Chloride and Sodium Bromide
The self-diffusion coefficient of sodium in sodium chloride and sodium bromide has been measured as a function of temperature. A comparison of the self-diffusion coefficient with the electrolytic conductivity reveals that the Einstein relation is satisfied at high but not at low temperatures. The temperature dependenc…
Molecular Orbital Calculations on Porphine and Tetrahydroporphine
The first three electronic transitions of porphine and the first five electronic transitions of tetrahydroporphine are predicted as simple one-electron LCAO molecular orbital transitions (with overlap included). The electron densities and bond orders in the ground states are also computed. The observed levels are tent…
Gallium and Germanium Substitutions in Synthetic Feldspars
Compounds of gallium and germanium isostructural with the feldspars have been prepared, and some of their crystal-chemical properties are here described. In the Na and K feldspars, $$Al^{+++}$$ and $$Si^{++++}$$ can be completely replaced by $$Ga^{+++}$$ and $$Ge^{++++}$$; but, in pure Ca feldspar, complete substituti…
Temperature Dependence of the Emission of an Improved Manganese-Activated Magnesium Germanate Phosphor
A number of recent researches have been concerned with magnesium germanate phosphors. An improved such phosphor is reported here having over twice the brightness of the previous compositions as prepared in this laboratory, and which shows peak luminescence efficiency at temperatures near 350°C. Temperature dependence…
Phase Relationships in the System Zirconia—Ceria
The phase relationships in the system zirconia‐ceria were investigated by X‐ray diffraction and dilatometric methods. The specimens were prepared by mixing and compacting the oxide powders and firing at 2000°C. At 2000°C. zirconia and ceria are miscible in each other from about 24 to 100 mole % ceria. The range of sol…
Sul processo di fabbricazione dei cementi ferrici
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Low heat cement and mass concrete construction
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Aged linseed oil as dispersing agent in portland cement analysis
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