Materials Literature
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Recent studies of fire accidents in Switzerland involving individuals' wearing apparel have illustrated the importance of a durable flame-retardant finish for cotton textiles. Knowledge of the dynamics and chemistry of pyrolysis and combustion is considered essential to understand the mechanism of flame-retardant syst…
A preliminary analysis of the absorption and fluorescence spectra of Er 3+ (4f 11 ) in LiYF 4 has been made. With the aid of previous work on Er 3+ in LaF 3 , various states have been identified. The Racah parameters giving the best overall agreement between the predicted `free ion' spectrum and the spectrum of Er 3+…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of metal-oxygen bridge systemsRichard M. Wing and K. P. CallahanCite this: Inorg. Chem. 1969, 8, 4, 871–874Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1969https://pubs.acs.org/doi/10.1021/ic50…
A model for describing the clustering of interstitial atoms in graphite is set forth, based on chemical reaction rate theory. Vacancies and interstitials are assumed to be homogeneously generated by the neutron flux. The interstitials are allowed to move freely between the layer planes whilst the vacancies are conside…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFluidized-Bed Combustion of Graphite-Base Nuclear Reactor FuelsH. O. WitteCite this: Ind. Eng. Chem. Process Des. Dev. 1969, 8, 2, 145–149Publication Date (Print):April 1, 1969Publication History Published online1 May 2002Published inissue 1 April 1969https://pubs.acs.org/do…
A precise determination of the temperature dependence of the zero external field F19 NMR frequency in the antiferromagnet FeF2 has been made over the temperature range from 4.2°K to 0.99966TN. Ferrous fluoride, unlike the previously studied antiferromagnet MnF2, has a large single ion magnetic anisotropy. The present…
Article Lattice Constants, Thermal Expansion Coefficients, Densities and Perfection of Structure of Pure Iron and of Iron Loaded with Hydrogen was published on April 1, 1969 in the journal International Journal of Materials Research (volume 60, issue 4).
Abstract The strength and extensibility of an unfilled styrene‐butadiene rubber vulcanizate were determined in constrained biaxial tension (essentially pure shear) by stretching thinwalled cylindrical specimens in the axial direction with an Instron tester while gas pressure was admitted to maintain constant the outsi…
Certain amorphous materials exhibit rapid electrical switching. The variation in their capacitance was evaluated as a function of temperature and electric field in the high-resistance state. The zero-field capacitance follows a Curie-Weiss law above room temperature. At low temperatures, and at fields near the thresho…
Formulas are developed and curves given for the magnetizing inrush current for a single-phase transformer. Series system inductance and resistance are included. The transformer is assumed to have no exciting current below saturation and constant saturated inductance above saturation. The formulas apply to circuits wit…
Abstract The ultimate properties of an unfilled styrene‐butadiene rubber vulcanizate in equal biaxial tension were determined by inflating a circular membrane into a bubble. Tests were made at several extension rates (evaluated at the pole) from about 0.15 to 4 min −1 and at temperatures from −43 to 90°C. The stress i…
The rates of dehydroxylation of three kaolinites which varied in particle thickness were studied from 417° to 480°C under very low water vapor partial pressures. The dehydroxylation rate was directly proportional to the surface area and had an activation enthalpy of 41.0 kcal/mol. The data did not fit either a diffusi…
Abstract Tributoxysiloxychlorosilanes [(BuO)3SiO]xSiCl4−x(Bu=t: x=1,2; Bu=s: x=1,2,3 or 4) were prepared by the reaction of silicon tetrachloride with tributoxysilanol in the presence of pyridine. The hydrolysis of these compounds led to the formation of tributoxysiloxysilanols [(BuO)3SiO]xSi(OH)4−x (Bu=t: x=2; Bu=s:…
The phenomena of electromigration is self-diffusion effect, and has an associated activation energy. Although the activation energy for bulk self-diffusion in aluminum is 1.48 eV, experimentally measured energies for films range approximately from 0.5 to 1.2 eV. This lower observed energy may be or has been ascribed b…
Abstract The photo‐oxidation of PVC has been studied over the temperature range 30–150°C. Initiation with ultraviolet (2537A) radiation has been correlated with the presence of minute amounts of ozone. The contribution of atomic oxygen and singlet oxygen ( 1 Δ g ) molecules to the initiation mechanism is discussed. Th…
A set of linear inequalities for the reduced two-body density matrix is presented. The general problem of finding all such inequalities is discussed. It is shown that all of the linear inequalities found so far for ensemble representability may be written as a single family of inequalities.
The aging phenomenon in tetragonal ferroelectric bairum titanate was investigated by optical microscopy and by electrical measurements. Transmission electron microscopy was used to observe in detail domain reactions which occurred during aging. Aging may be characterized as an exhaustion‐type process because of the in…
Abstract α-Isopropylmalate synthase, the first enzyme in the biosynthesis of leucine, was purified to homogeneity from extracts of strain CV-19 of Salmonella typhimurium. From gel filtration and disc gel electrophoresis experiments it was deduced that the enzyme can exist in two physically distinguishable forms and th…
The possible mechanisms of action of bovine pancreatic ribonuclease are discussed in the light of the detailed knowledge of the geometry of the active site that has been derived from studies of inhibitor binding by X-ray diffraction and nuclear magnetic resonance. When combined with a knowledge of the mechanism of pho…
The internal friction of silicate glasses containing mixtures of Li‐Na, Li‐K, Li‐Rb, Li‐Cs, Na‐K, Na‐Rb, Na‐Cs, and K‐Rb was measured from ‐180° to 500°C at a frequency of 0.4 Hz. Values for the density, index of refraction, and dynamic shear modulus are also reported. With small additions of a second alkali, a new in…