Materials Literature
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Abstract It has been discovered that when fuming nitric acid oxidises bulk samples of polythene crystallised from the melt, preferential attack on the links between the lamellar crystals occurs with the consequent release of fragments of these crystals. The reaction is not confined to the surface of samples and lamell…
Results of absorption spectra measurements on silicate glasses of various compositions indicate that ions of the first transition-metal series are present in tetrahedral and octahedral sites in silicate melts (glasses). The fractionation patterns observed for transition-metal ions between magmas and silicate minerals…
Am Beispiel der Synthese des Nickel(II)-Komplexes des (±)-1.8.8.13.13-Pentamethyl-trans-corrins wird ein synthetischer Zugang zum Verbindungstyp der Corrine aufgezeigt. Durch die mehrfache Verwendung des Triäthyloxonium-tetrafluorborats bietet die Arbeit eine Illustration der präparativen Bedeutung der von H. Meerwein…
An exact integral equation is derived for the backscattering coefficient as a function of energy and angle. The equation has an approximate symmetry which allows one to determine the conditions under which backscattering will be independent of the energy of the incident electrons. The validity of some approximations i…
A numerical program has been developed for the calculation of atomic photoelectric differential and total cross sections, including all polarization correlations. The program is designed to calculate relativistic Coulomb wave functions in a screened central potential; the outgoing continuum wave function is obtained i…
The wave function for the electrons is investigated when a set of narrow bands (valence states) has its energies within a wide band (conduction states). The valence states are linear combinations of localized states which are attached to each lattice site. The intra-atomic Coulomb and exchange integrals for the locali…
The thermal conductivity $K$ of single crystals of silicon has been measured from 3 to 1580\ifmmode^\circ\else\textdegree\fi{}K and of single crystals of germanium from 3 to 1190\ifmmode^\circ\else\textdegree\fi{}K. These measurements have been made using a steady-state, radial heat flow apparatus for $T>300\ifmmod…
Relatively large chemical shifts in the resonance frequency of the thallium nucleus are observed in both the crystalline and molten states of different thallium salts. Relative to TlNO3, which appears to be the most ionic of all thallium salts studied, the 205Tl resonance frequency at fixed field increases in the orde…
Experimental evidence for nonradiative resonant energy transfer between Eu3+ and other trivalent rare-earth ions in Y2O3 is presented and possible interaction mechanisms are examined. It is concluded that coupling via overlap of near zone quadrupolar fields is important. Measurements on the transient behavior of the E…
The first-order density matrix is obtained for the state corresponding to a spin projection of a general different orbitals for different spins single determinental function. Explicit expressions are given for the natural orbitals and occupation numbers in terms of parameters characteristic of the unprojected state. T…
The thermal conductivities and thermoelectric powers of two previously reported polymeric organic semiconductive materials are reported. One system, thought to be a form of oxidized polyphthalocyanine, shows very complex behavior on heating in the presence of oxygen. The thermoelectric power is very sensitive to this…
The position of the Fermi level at a metal-semiconductor interface relative to the conduction band has been found to be a constant fraction of the semiconductor band gap for all but 3 of the 14 group IV or III-V semiconductors studied. In all cases, the position was essentially independent of the metal work function.…
Abstract Die Anwendung der von Fehér, Kuhlbörsch und Luhleich angegebenen Arbeitstechnik auf die Reindarstellung und Handhabung der Silane für thermochemische Untersuchungen wird beschrieben. Di‐, Tri‐ und n‐Tetrasilan werden zur Bestimmung ihrer Verbrennungswärmen in einem Bombenkalorimeter verbrannt. Dabei verbrenne…
Abstract Constant pressure diffusion rates of hydrogen through Vycor porous glass were measured in nitrogen and neon systems. The experimental diffusivities are less than those predicted by the random pore model indicating that this model may not be satisfactory for a low porosity material such as Vycor. Interpreted i…
Products of the oxidation of cis-polyisoprene boiling lower than water have been resolved and identified. They are: acetaldehyde, methyl formate, propionaldehyde, acetone, methanol, sylvan, methacrolein, ethanol, butanone, and butenone, Possible mechanisms for their origin are discussed.
Abstract Early lineations lying on a surface that becomes conically folded are themselves folded into complex spiral curves the form of which depends on the style of the fold, on the cone angle, and on the orientation of the early lineations on the fold. Breaks in the curve occur where early and cone lineations are pa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecarboxylation. I. Kinetic Study of the Vapor Phase Thermal Decarboxylation of 3-Butenoic AcidGrant Gill Smith and Sullivan E. BlauCite this: J. Phys. Chem. 1964, 68, 5, 1231–1234Publication Date (Print):May 1, 1964Publication History Published online1 May 2002Published ini…
Abstract The interaction between nylon 6 and water has been studied from water vapor sorption isotherms, diffusion of water vapor in the polymer, and nuclear magnetic resonance (NMR) properties. The variations in water sorption properties of various heat treated specimens seem to result from the difference in the degr…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrogen Adsorption on Silver, Gold, and Aluminum. Studies of Parahydrogen ConversionS. J. Holden and D. R. RossingtonCite this: J. Phys. Chem. 1964, 68, 5, 1061–1067Publication Date (Print):May 1, 1964Publication History Published online1 May 2002Published inissue 1 May 196…
The effect of urea on gelatin gels was studied by measuring gel rigidity at different gelatin and urea concentrations. Rigidity of gels was expressed as the force necessary to depress the gel with a standard plunger a distance of 4 mm. In agreement with the data in the literature, a straight-line relationship was obta…