Materials Literature
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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…
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…
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…
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…
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 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…
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…
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…
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…
Abstract 1. In Fortsetzung unserer Untersuchungen über Thio‐ 2 ) und Selenohalogenide 3 ) des dreiwertigen Antimons und Wismuts wurden folgende Tellurohalogenide durch gemeinsames Tempern von Tellurid und Halogenid unter Luftabschluß dargestellt: SbTeJ, BiTeBr und BiTeJ. SbTeJ kristallisiert in rhombischen Nadeln mit…
A general method is developed for a rigorous estimation to upper and lower bounds of scattering phases in the variational methods applied to one-dimensional problems. It is also possible to estimate the mean error of the approximate wave function itself. An essential point in the method is the evaluation of mean squar…
Absolute rate theory is combined with molecular models in the study of the annealing of metals and of glass. It is thus possible to obtain expressions which are in close agreement with experimental data. Both the observed first-order data for metals and the second-order data for glass are predicted in this way. A virt…
In Part I the subjective evaluation of stiffness is used as a standard with which to compare the results obtained from five laboratory methods of measuring stiffness. Measurements were made on a range of nineteen fabrics of varying fiber content, weave, and weight. The results indicated significant correlation in four…
It will be pointed out that the anisotropy energy is of primary importance in the theory of antiferromagnetism. The formula for the susceptibility χ= (χ∥ + 2χ⊥)/3, which follows in van Vleck's theory from a rather arbitrary assumption that the parallel and perpendicular domains are distributed with a ratio 1:2, can on…
An investigation of the diffusion of ions in several glasses was made using radioactive tracer techniques. The resulting diffusion curves were analyzed to obtain the thermodynamic properties of the diffusion process. These properties are indicative of energy and structure changes in the glass networks. Interpretations…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAmmonia Decomposition and Related Phenomena on Rhenium Catalysts1James Peter McGeer and Hugh S. TaylorCite this: J. Am. Chem. Soc. 1951, 73, 6, 2743–2751Publication Date (Print):June 1, 1951Publication History Published online1 May 2002Published inissue 1 June 1951https://pu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTInfluence of Molecular Weight on the Properties of PolystyreneE. J. Merz, L. E. Nielsen, and Rolf BuchdahlCite this: Ind. Eng. Chem. 1951, 43, 6, 1396–1401Publication Date (Print):June 1, 1951Publication History Published online1 May 2002Published inissue 1 June 1951https://…
The following paper deals with evidence of ferroelectricity in KNb${\mathrm{O}}_{3}$ and NaNb${\mathrm{O}}_{3}$. Temperatures at which both materials undergo crystallographic changes and corresponding changes in dielectric constant and loss tangent are reported. Photographs of dielectric hysteresis loops and values of…
Abstract The theory of propagation of longitudinal waves of plastic deformation is extended to apply to materials in which the stress is a function of the instantaneous plastic strain and strain rate. Solutions are given for an idealized flow law and compared with solutions based upon earlier theories which neglect st…
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