The Theory of Polarization Phenomena
"The Theory of Polarization Phenomena." Optica Acta: International Journal of Optics, 22(7), p. 638
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Unusual metalloporphyrins. XXIII. Unusual metalloporphyrin complexes of rhenium and technetium
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual metalloporphyrins. XXIII. Unusual metalloporphyrin complexes of rhenium and technetiumM. Tsutsui, C. P. Hrung, D. Ostfeld, T. S. Srivastava, D. L. Cullen, and E. F. Meyer Jr.Cite this: J. Am. Chem. Soc. 1975, 97, 14, 3952–3965Publication Date (Print):July 1, 1975Publ…
Clay mineralogy of sediments of the western Nile Delta
Abstract Investigation of the clay mineralogy of forty-seven samples of sediments from boreholes in the western Nile Delta, an area little studied hitherto, and from surface sites on the mouth of the Nile and adjacent coast shows that the clay fractions consist of dominant iron-rich, dioctahedral, randomly interstrati…
Non-parallel dissociation of dislocations in thin foils
The equilibrium shape of dissociated dislocations in thin foils of Cu-10 at.% Al is investigated by weak-beam electron microscopy. It is found that dislocations assume a truncated triangular shape caused principally by the reduction in line energy when Shockley partials rotate towards screw character. The effects of i…
Optical and electrical properties of Mn-doped GaAs grown by molecular-beam epitaxy
An isolated acceptor impurity is shown to be responsible for the ∼113-meV deep luminescence band which is frequently seen in GaAs layers grown by molecular-beam epitaxy. We establish that this center, which is also observed in melt-grown and solution-grown GaAs and which has often been associated with the presence of…
Electrochemichromic Systems for Display Applications
Several electrochemical systems exhibit an intense color change when an electrochemical reaction is induced by an applied electrical field or current. The electrochemical and electro‐optical properties of several such systems have been investigated. These systems are termed electrochemichromic and they can be classifi…
Quantitative structural characterization of the melting behavior of isotactic polypropylene
Abstract The melting behavior of restrained isotactic polypropylene fibers is examined quantitatively in terms of the influence the anisotropic structural state of the polymer has on the observed properties. Two endotherm peaks are observed to occur in some of the samples. The formation and location of the multiple pe…
Effect of Crystallizing the Grain‐Boundary Glass Phase on the High‐Temperature Strength of Hot‐Pressed Si 3 N 4 Containing Y 2 O 3
The effects of fabrication variables on the high‐temperature strength of hot‐pressed Si 3 N 4 containing 5 wt% Y 2 O 3 were studied. Materials containing a crystalline grain‐boundary phase, formed as a consequence of a high‐temperature presintering heat treatment and identified as Si 3 N 4 ·Y 2 O 3 , had high‐temperat…
The nature of multiple melting transitions in cis‐polyisoprene
Abstract The multiple melting transitions previously reported for cis ‐polyisoprene have been related to different morphological species observed in thin films using transmission electron microscopy. Two distinct types of spherulitic lamellar crystal have been identified which have characteristic growth rates, lamella…
Spectral Approximation for Compact Operators
In this paper a general spectral approximation theory is developed for compact operators on a Banach space. Results are obtained on the approximation of eigenvalues and generalized eigenvectors. These results are applied in a variety of situations.
Efficiency of Dy3+‐Activated Phosphors
The quantum efficiency of Dy 3+ ‐activated phosphors is reasonably high in lattices where a low activator concentration (≤ 1%) is already sufficient for effective energy transfer from the lattice to the activator ions. When more activator is needed for effective energy transfer, the quantum efficiency is limited due t…
Temperature, concentration, and molecular weight dependence of the twist elastic constant of cholesteric poly-γ-benzyl-L-glutamate
Aspects of the behavior of the twist elastic modulus K22 of a lyotropic liquid crystal formed by the α-helical polypeptide poly-γ-benzyl-L-glutamate of three molecular weights (MW= 300 000, 310 000, and 550 000) in three solvents (dioxane, dichloromethane, and chloroform) were investigated as a function of concentrati…
Transport limited nutrient uptake rates in Ditylum brightwellii1
The analysis of diffusional transport limitation of nutrient uptake rates by phytoplankton, derived earlier for spherical cells, is extended to include, in an approximate manner, cylindrical and disk‐shaped cells. Transport limitation of nutrient (NO 3 − and NO 2 − ) uptake rates by the marine diatom, Ditylum brightwe…
Electron-energy losses in silicon: Bulk and surface plasmons and Čerenkov radiation
Characteristic electron-energy-loss processes in crystalline silicon foils are examined for scattering angles less than 2.5 \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}4}$ rad. The relatively high energy of the electron beam (75 keV), combined with a low angular divergence (8 \ifmmode\times\else\texttimes\…
The crystal structure of a boron-rich boron carbide
Structural changes accompanying extreme boron-enrichment of boron carbide were deduced with Mo K0¢ X-ray diffraction data obtained from a twinned aggregate containing a minimal amount of carbon. The crystal system remains rhombohedral, probable space group R-3m, as for B4C, but unit-cell parameters show significant ex…
Effects of molecular complexing on the properties of binary nematic liquid crystal mixtures
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffects of molecular complexing on the properties of binary nematic liquid crystal mixturesJ. W. Park, C. S. Bak, and M. M. LabesCite this: J. Am. Chem. Soc. 1975, 97, 15, 4398–4400Publication Date (Print):July 1, 1975Publication History Published online1 May 2002Published i…
Calculation of Cooling Rate and Induced Stresses in Drawing of Optical Fibers
The rate of cooling of fused‐silica fibers and the generation of stress in clad fibers of fused silica and 96%‐silica glass (∼125 μm OD) pulled at 1750°C were studied. Experimental cooling rates reported by previous workers were fitted using low‐ and high‐temperature heat‐transfer coefficients derived from their data.…
Electron spin resonance in natural kaolinites containing Fe3+ and other transition metal ions
Abstract A number of natural kaolinites from a variety of world sources have been investigated using electron spin resonance at both X-band and Q-band. The results show systematic differences some of which are related to the crystallinity of the material, some to the presence of transition metal ions other than Fe 3+…
Growth of calcium oxalate crystals. II. Inhibition by natural urinary crystal growth inhibitors.
A method is described for quantitatively determining the inhibitory activity of pure components, isolates, or mixtures of components (such as urine) on the growth of calcium oxalate crystals. Results with known calcium phosphate crystal growth inhibitors--magnesium, citrate, and pyrophosphate--suggest that these compo…
Extinction within the limit of validity of the Darwin transfer equations. III. Non-spherical crystals and anisotropy of extinction
Previously derived formalisms for extinction are extended to include crystals of non-spherical shape and anisotropy of mosaic spread and particle size. Expressions derived for extinction in an ellipsoidal crystal are compared with numerical calculations on a polyhedral specimen. A pseudo-spherical approximation for po…