1950 Fourth straight peak year
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L’impiego del metano nei forni rotanti da cemento
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Defective mortar and concrete in marine works
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ASTM convenes in Atlantic City for 54th annual meeting
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Blowing of internal plaster
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The cement industry in Japon
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Per Ia razionale scorificazione del clinker di cemento
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Neutron Scattering and Polarization by Ferromagnetic Materials
Neutron diffraction studies are reported on a series of magnetized and unmagnetized ferromagnetic materials. The diffraction patterns for unmagnetized, polycrystalline samples of Fe and Co are found to possess both nuclear and magnetic components with the latter in agreement with the magnetic scattering theory with re…
Application of Collective Treatment of Electron and Ion Vibrations to Theories of Conductivity and Superconductivity
Received 21 September 1951DOI:https://doi.org/10.1103/PhysRev.84.836.2©1951 American Physical Society
Measurement of Multiple Scattering of 15.7-Mev Electrons
The angular distribution of electrons scattered by thin Be and Au foils has been measured for angles where the multiple scattering is important. The $\frac{1}{e}$ widths of the distributions obtained with Au foils of 18.66 and 37.28 mg/${\mathrm{cm}}^{2}$ are 2.58\ifmmode^\circ\else\textdegree\fi{} and 3.76\ifmmode^\c…
A Note on the Propagation of Excitation in an Idealized Crystal
It is shown that, in insulators, overlapping of the electronic wave functions of near-by crystal constituents is not necessary for effective transfer of excitation energy by the "exciton" mechanism. The electromagnetic interaction of the "virtual" dipoles of the transition is sufficient to give rise to such transfer c…
The Physical Properties of Cuprous Sulfides-Semiconductors
Cuprous sulfide has been observed to have two transition points at about 110°C and 470°C respectively, of which the latter one has been found out experimentally by the writer. The exsistence of the phase transition at 470°C has been confirmed experimentally by the measurements of electronic and ionic conductivity, the…
Theory of the Specific Heat of Graphite
The graphite crystal is considered as a system of thin elastic plates spaced at a constant distance. An elastic force is assumed to act between each neighboring plates in such a way that a local change of the spacing between them produces at that point a tension or a pressure normal to the plates whose magnitude is pr…
Zur Kenntnis der Kieselsäuren. VII. Über Kieselsäurederivate der Dioxybenzole
Abstract Bei der Umsetzung von SiCl 4 mit Brenzcatechin, Resorcin und Hydrochinon werden neue Kieselsäurederivate erhalten. Bei ihnen erfolgt unter Entstehung von Polymeren die Verknüpfung der Siliciumatome nicht wie bei Siloxanen oder Polyestern über ein einfaches O‐Atom, vielmehr werden Brücken aus –OC 6 H 4 O‐Gru…
Das System Ge/Geo/GeO2
Abstract GeO wird durch Sublimation im Vakuum aus GeO 2 + Ge hergestellt. Die Bildungswärme von festem GeO wird durch Umsatz mit einer flußsauren Lösung von AgClO 4 zu 77,2 kcal bestimmt (§ 3). Die Sublimationsdrucke von GeO werden zwischen 900 und 1000° K mit einer statischen Methode gemessen und die Verdampfungswärm…
The crystal structure of amesite and its thermal decomposition
Araesite, for long regarded as a chlorite and accepted as an end-member in classifications of these minerals, was first stated to have a kaolin-type structure by Gruner from considerations of 00l reflexions. Single crystals have been obtained yielding rotation diagrams sufficiently good to justify a structure analysis…
Preparation and Properties of Hexaaryldisilanes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPreparation and Properties of HexaaryldisilanesHenry Gilman and G. E. DunnCite this: J. Am. Chem. Soc. 1951, 73, 11, 5077–5079Publication Date (Print):November 1, 1951Publication History Published online1 May 2002Published inissue 1 November 1951https://pubs.acs.org/doi/10.1…
X-Ray Photoelectron Spectrometer for Chemical Analysis
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTX-Ray Photoelectron Spectrometer for Chemical AnalysisRalph Steinhardt and Earl SerfassCite this: Anal. Chem. 1951, 23, 11, 1585–1590Publication Date (Print):November 1, 1951Publication History Published online1 May 2002Published inissue 1 November 1951https://pubs.acs.org/d…
``CHEMICAL'' ANALYSIS OF THE INTACT SKIN BY REFLECTANCE SPECTROPHOTOMETRY
IT HAS been said repeatedly that one of the greatest obstacles to progress in dermatology is the lack of practical, quantitative methods for investigation of the skin. It is true, of course, that a number of good functional tests exist: measurement of sweating, sweat sodium, and lipid secretion, for example, is possib…