Die eigenschaften der zementrohmaterialien und deren einflüsse auf das zementbrennen
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Fundamentals of gypsum calcination
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El Salvador's first cement plant nears completion
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Antiferromagnetism and Ferrimagnetism
The present position of our knowledge of antiferromagnetism, including ferrimagnetism, is reviewed, and some very interesting phenomena concerning the magnetic behaviour of certain ferrites and of pyrrhotite are described and explained.
Anomalous paramagnetism of copper acetate
Abstract The paramagnetic resonance spectrum of copper acetate is anomalous in that it resembles that of an ion of spin 1, and its intensity decreases as the temperature is lowered. The latter is correlated with the decreasing susceptibility found by Guha (1951). The following hypotheses are suggested: (1) the crysta…
Zur Polymerisation ungesättigter Dioxolane
Abstract Nach einer Definition des Begriffes Dioxolan wird das Polymerisationsverhalten dieser Verbindungen, soweit sie durch eine oder mehrere, semicyclisch gebundene Doppelbindungen charakterisiert sind, besprochen. An Beispielen ein‐ und zweifach ungesättigter Vertreter wird gezeigt, daß die Polymerisation als kryp…
On the Magnetism of Magnetic Compounds: General Treatment of Superexchange Interaction
In this paper the theories of superexchange interaction developed by Kramers and Anderson have been more generally reformalized by means of the well-known vector model. The formulation can also be applied to the problem of molecular structure in which a consideration of the various orbital configurations of electrons…
Gravimetric Determination of Thorium and Rare Earth Elements in Magnesium Alloys
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGravimetric Determination of Thorium and Rare Earth Elements in Magnesium AlloysG. B. Wengert, R. C. Walker, M. F. Loucks, and V. A. StengerCite this: Anal. Chem. 1952, 24, 10, 1636–1638Publication Date (Print):October 1, 1952Publication History Published online1 May 2002Pub…
The Electronic Properties of Barium Sulfide
Barium sulfide has been prepared in a form suitable as a cathode emitter as well as in the form of compressed pills. It has a work function of 2.1 ev with a wide variation possible in activation. The most active materials had an emission at temperatures of 900°K and greater comparable to that from pure BaO. Pure nicke…
Cracking of High Strength Steels In Hydrogen Sulfide Solutions
Laboratory data are presented relating to the spontaneous cracking and embrittlement of steel alloys under environmental and stress conditions pertinent to sour gas condensate wells. It has been shown that cracking can occur in simple aqueous hydrogen sulfide solutions and is an effect related to stress corrosion crac…
Studies concerned with the structure of collagen. II. Stress‐strain behavior of thermally contracted collagen
Abstract Thermally contracted collagen, when swollen in appropriate media, obeys rubber elasticity theory. On the basis of the measurements which were made, it was possible to establish that the material behaves as if it were a network polymer crosslinked by covalent bonds. However, the chemical nature of these crossl…
Über Kaliumcuprat(III)
Abstract Durch Umsatz von KO 2 und CuO in O 2 ‐Atmosphäre wurde bei 400–450° C KCuO 2 als stahlblaue, unmagnetische Verbindung erhalten. Die Substanz zeigt ein charakteristisches Röntgendiagramm; sie zersetzt sich mit verdünnten Säuren unter O 2 ‐Entwicklung und Bildung von Cu(II)‐Salzen. Thermisch zersetzt sie sich o…
STUDIES OF RDX AND RELATED COMPOUNDS: VII RELATION BETWEEN RDX AND HMX PRODUCTION IN THE BACHMANN REACTION
The reactions to form RDX and HMX in Bachmann-type mixtures are comparable in respect of optimum nitric acid concentrations and in the fact that optimal amounts of acetic anhydride and ammonium nitrate are necessary for maximum yields of either explosive. The activation energies for formation of RDX and HMX were also…
Korrosionsbeständigkeit von Kunststoffen
Abstract Die Verwendung von Kunststoffen hat in den letzten Jahren im Apparatebau und in der chemischen Industrie ständig an Bedeutung gewonnen. Es ist deshalb wichtig, daß man sich einen Überblick über die Chemikalienbeständigkeit dieser Stoffe verschafft. Es werden der Verlauf und die verschiedenen Arten der Chemika…
Notizen: Zur Kenntnis eines Cadmium-bor-wasserstoffs Cd(BH4)2
Cadmiumchlorid und Lithiumboranat reagieren in atherischem Medium bei 0° miteinander unter Bildung eines Cadmiumboranats, Cd(BH 4 ) 2 . das schon bei Zimmertemperatur langsam in die Elemente zerfallt. Als Zwischenstufe der Umsetzung tritt ein Chlorcadmiumboranat, CdCl(BH 4 ), auf.
Studies in Graphite and Related Compounds III: Electronic Band Structure in Boron Nitride
An analysis is made of the distribution of π-electrons in the crystal of boron nitride. The insulating character of this substance is shown by the fact that these electrons completely occupy one band, of width approximately 2.4 eV, separated from the next higher band by a gap of about 4.6 eV. The density of states in…
The Mechanics of Bent Yarns
This paper analyzes the idealized geometry of a bent yarn. Expressions are derived for the cal culation of local fiber tensile strain, average strain in the helix half loop, motion of the fibers during bending of the yarn, changes in local helix angles, and fiber curvatures at the bend. The relationships between the g…
Studies in Graphite and Related Compounds I: Electronic Band Structure in Graphite
The Bloch (tight-binding) approximation is applied to a study of graphite The Mean energy per atom and the internuclear distance are calculated in good agreement with experiment. Previous accounts are extended by including certain overlap imegrals and by dealing with a set of parallel layer planes instead of only one…
Calorimetric properties of polytetrafluoroethylene (teflon) from 0-degrees to 365-degrees-K
The tl:erma.l properties of polytetra~~oro e thyl ene (Teflon ) . samples were investigated, uStng an ad l abatJc~vacuum calonmeter. Ihe effect of the annealll1g and quenchtng processes on the heat capacity of a mold ed T eflon sample was studied. The heat-capacity data were used to compute the heat capacity, enthalpy…
Nuclear Electric Quadrupole Spectra in Solids
Recent experiments have demonstrated the feasibility of observing nuclear electric quadrupole interactions of widely varying magnitudes in solids. While these effects can often be observed in powdered samples, the most complete information is obtainable from the Zeeman pattern of a single crystal. To facilitate interp…