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The effect of strain, in particular the effect of varying the rate of its application, both in the elastic and the plastic region, on the anodic dissolution kinetics of several metals has been studied. It has been found in the case of iron in acid solution that the over-all effect of elastic strain is small (i.e., the…
Structure has been observed in the photoconductivity spectrum of semiconducting diamond at energies below the ionization threshold. Photoconductivity maxima in this spectral region have been found to coincide exactly with maxima in the absorption spectrum associated with transitions to excited states of the aluminum a…
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The use of a spin-\textonehalf{} formalism to analyze paramagnetic and paraelectric resonance experiments of "non-Kramers" doublets leads to a break with the accepted meaning of effective-spin Hamiltonians. The operators appearing in the Hamiltonian do not have the transformation properties of spin angular momentum in…
The procedures developed in two previous papers by the authors for calculating the parameters $D$ and $E$ in the spin Hamiltonian ${\mathcal{H}}_{s}=D[3{{S}_{z}}^{2}\ensuremath{-}S(S+1)]+E({{S}_{x}}^{2}\ensuremath{-}{{S}_{y}}^{2})$ for iron-group $3{d}^{5}(^{6}S)$ ions are applied to a distorted cubic system, namely,…
Crystal-field splittings in a high-symmetry phase may leave an orbitally degenerate ground state. Three types of degeneracies are considered: (1) a twofold degeneracy that carries no orbital angular momentum, (2) a twofold degeneracy that carries an orbital angular momentum, and (3) a threefold degeneracy that carries…
Spontaneous-emission probabilities for electric- and magnetic-dipole transitions from excited electronic states of ${\mathrm{Pr}}^{3+}$, ${\mathrm{Nd}}^{3+}$, ${\mathrm{Eu}}^{3+}$, ${\mathrm{Er}}^{3+}$, and ${\mathrm{Tm}}^{3+}$ impurities in ${\mathrm{Y}}_{2}$${\mathrm{O}}_{3}$ are calculated using eigenstates in inte…
We report the first clear evidence that rf magnetic fields generate acoustical side-bands in the M\"ossbauer spectra of metallic ${\mathrm{Fe}}^{57}$. We advance an explanation of this magnetoacoustic effect in terms of magnetostriction, and suggest that this effect provides a consistent explanation of the results of…
Measurements of electron-capture cross sections ${\ensuremath{\sigma}}_{10}$ and electron-loss cross sections ${\ensuremath{\sigma}}_{01}$ for protons and atomic hydrogen in ${\mathrm{H}}_{2}$, He, Ar, Kr, ${\mathrm{N}}_{2}$, ${\mathrm{O}}_{2}$, CO, C${\mathrm{O}}_{2}$, ${\mathrm{H}}_{2}$O, C${\mathrm{H}}_{4}$, ${\mat…
Abstract Evaluations of cyclic iminocarbodithioates as accelerators and vulcanizing agents are described. The starting amines include morpholine and 3-azabicyclo-[3.2.2]nonane and vary in ring size from tetra- to octamethylenimine. The chemical structure of these compounds is correlated with their cure characteristics…
The photolysis of polyvinylpyrrolidone in oxygen-free aqueous solutions has been investigated as a function of polymer concentration, chain length, light intensity, and temperature. Ultraviolet spectra at various degrees of degradation have been measured. The experimental data can be satisfactorily accounted for by a…
Abstract Nitroalkyl acrylates and methacrylates involving some new compounds were prepared. The homopolymerization of these monomers in toluene and their copolymerization with styrene in acetone were carried out with azobisisobutyronitrile as initiator. The rate of polymerization of the nitroalkyl acrylates showed a c…
Abstract The surface conductivity of salt free montmorillonite clay gels saturated with lithium, sodium, potassium and cesium has been studied. The theory of the behavior of heterogeneous dielectrics adapted to systems having a surface charge density has been applied to the clay gels. From numerical calculations it be…
Abstract The dissolution of hectorite suspensions in M/20 CaCl 2 has been studied under conditions of low acidity. The reaction was almost completed within 2 weeks but very slow changes continued. There was an initial preferential release of Mg which corresponded approximately to the number of Mg atoms exposed at the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxamides. 1. Preparation and Characterization of Cyclic OxamidesO. Vogl and A. C. KnightCite this: Macromolecules 1968, 1, 4, 311–315Publication Date (Print):July 1, 1968Publication History Published online1 May 2002Published inissue 1 July 1968https://pubs.acs.org/doi/1…
Abstract Dithioamines and sulfenamides derived from various cyclic amines were evaluated as accelerators and vulcanizing agents. Structural variations of these compounds are correlated with their scorch delaying properties, accelerating activity and vulcanization efficiency, employing the Mooney Viscometer and the Mon…
Drawn and undrawn nylon 66 filaments were exposed to oxygenated aqueous systems, and the extent of chemical degradation was studied as a function of time. Degradation was estimated by measuring the changes in both chemical and physical properties. At the same time, oxygen absorption measurements were made and these we…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPolyoxamides. II. Polymerization of Cyclic DiamidesO. Vogl and A. C. KnightCite this: Macromolecules 1968, 1, 4, 315–318Publication Date (Print):July 1, 1968Publication History Published online1 May 2002Published inissue 1 July 1968https://pubs.acs.org/doi/10.1021/ma60004a00…
Abstract Temperature dependence of dielectric loss, mechancial loss, and dynamic modulus were measured to study polymer blending. Results were as follows: Dielectric loss and dynamic modulus of NR—BR blends showed two peaks corresponding to NR and BR, indicating that the blends were microheterogeneous. A single, broad…
A literature survey on thermal stresses during welding and buckling after welding is described. From the analyses found, a computer program was developed to calculate thermal stresses and resulting residual stresses due to a moving heat source. This program is included in the appendix. Studies at Marshall Space Flight…