El cemento en 1950
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Contrôle de la cuisson en four Hoffmann
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A quick determination of concrete aggregate proportions
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Influence de la température et de l’humidité de l'air sur le comportement des enduite de plátro
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Note sur le recherche dulaitier de haut tourneau dans les ciments portland artificiels
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New cement works at La Tolteca, Mexico
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Importance de 'la cheux grase dans la production francaise
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A new cement plant in South Dekota
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Etude thermique d'un laitier trempé de hant journeau
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British standard vicat apparatus
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On the Dispersion of Resistivity and Dielectric Constant of Some Semiconductors at Audiofrequencies
Semiconducting ${\mathrm{Ni}}_{0.4}$${\mathrm{Zn}}_{0.6}$${\mathrm{Fe}}_{2}$${\mathrm{O}}_{4}$, prepared in different ways, has been investigated. It appeared that the ac resistivity and the apparent dielectric constant of the material show a dispersion which can be explained satisfactorily with the help of a simple m…
Über Kumulene IV; Oktaheptaene
Abstract Triacetylen liefert mit Benzophenon und mit Fluorenon Oktatriin‐diole, deren Reduktion mit Phosphordijodid (P 2 J 4 ) + Triäthylamin zu Oktaheptaenen führt. Man erhält Lösungen eines violetten und eines blauen Kumulens, deren Absorptionsbanden beschrieben werden. Durch „Einbettung”︁ in kristallisiertes Benzop…
Determination of Formal Oxidation Potentials of Ferric-Ferrous and Dichromate-Chromic Systems. Selection of Substituted 1,10-Phenanthroline Indicators for Determination of Iron at Low Acidity
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of Formal Oxidation Potentials of Ferric-Ferrous and Dichromate-Chromic Systems. Selection of Substituted 1,10-Phenanthroline Indicators for Determination of Iron at Low AcidityG. Frederick Smith and Birgit Wallberg-OlaussonCite this: Anal. Chem. 1951, 23, 6, 9…
Separating Asphalt into Its Chemical Constituents
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSeparating Asphalt into Its Chemical ConstituentsGordon O'Donnell, L. T. Snider, and E. G. RietzCite this: Anal. Chem. 1951, 23, 6, 894–898Publication Date (Print):June 15, 1951Publication History Published online1 May 2002Published inissue 15 June 1951https://pubs.acs.org/d…
The growth of crystals and the equilibrium structure of their surfaces
Abstract Parts I and II deal with the theory of crystal growth, parts III and IV with the form (on the atomic scale) of a crystal surface in equilibrium with the vapour. In part I we calculate the rate of advance of monomolecular steps (i.e. the edges of incomplete monomolecular layers of the crystal) as a function of…
Contradictory Data on Spiral Structures in the Secondary Cell Wall of Fibers of Flax, Hemp, and Ramie
Althought the microscopy of the well-known textile fibers flax, hemp, and ramie is familiar to many people and the spiral structure of their cell-wall layers is mentioned in many textbooks, the study of the original literature on this point disclosed many contradictory data. However, there cannot exist essential diffe…
Raman Spectra of Several Compounds Containing Phosphorus
Raman spectra of water solutions of NaH2PO2, KH2PO2, HPO3, NaPO3, K4P2O7, K2Na2P2O7, K2H2P2O7, and Na2H2P2O7 were photographed using a Hilger constant-deviation spectrograph. Illumination was provided by four Hanovia mercury lamps, the 4358A line being used as the exciting radiation. A system of liquid filters reduced…
Littoral diatoms from the Salstone, near Plymouth
The diatom flora inhabiting the muddy shores and bottoms off Plymouth has received little attention in comparison with the fauna associated with such muds. Since a large number of the microfauna depend, to a great extent, upon the diatoms as a source of food (Mare, 1942), a knowledge of the latter is there-fore desira…
LXII. The critical magnetic fields of aluminium, cadmium, gallium and zinc
The low temperatures produced by the adiabatic demagnetization of a paramagnetic salt have been used to cool specimens of aluminium, cadmium, gallium and zinc, and their critical fields have been measured down to 0·1° K. The magnetic measurements on the metal and the salt were made independently and the experimental a…
THE TIDAL RHYTHM OF THE DIATOM HANTZSCHIA AMPHIOXYS
1. A sand-dwelling population of the diatom Hantzschia amphioxys Ehrb. is described, which exhibits a tidal rhythm that persists for sonic days when held without tide under artificial conditions in the laboratory. This rhythm is characterized by a periodic inversion of the phototropistic response, and by an agglutinat…