The Concept of a Hydrophyte for Wetland Identification
Ralph W. Tiner; The Concept of a Hydrophyte for Wetland Identification: Individual plants adapt to wet environments, BioScience, Volume 41, Issue 4, 1 April 199
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Design trades for Rotman lenses
The foundation of a satisfactory Rotman lens design is geometric. The effects of seven design parameters (focal angle, focal ratio, beam angle ratio, maximum beam angle, beam port curve ellipticity, array element spacing, and focal length/ lambda ) on the shape, and on the geometric phase and amplitude errors of a Rot…
Aggregation of coil-crystalline block copolymers: equilibrium crystallization
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation of coil-crystalline block copolymers: equilibrium crystallizationT. Vilgis and A. HalperinCite this: Macromolecules 1991, 24, 8, 2090–2095Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 April 1991https://pub…
Ferrite Materials: Science and Technology
Chemistry of ferrites theoretical models of electrical properties of ferrites electrical conductivity and thermoelectric power of ferrites low frequency dielectric properties of ferrites transport mechanism in mixed ferrites at microwave frequencies magnetic properties at microwave frequencies theory and design of non…
Molecular dynamics simulation of an amorphous polymer under tension. 1. Phenomenology
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular dynamics simulation of an amorphous polymer under tension. 1. PhenomenologyDavid Brown and Julian H. R. ClarkeCite this: Macromolecules 1991, 24, 8, 2075–2082Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 Apr…
Dipolar-glass model for lead magnesium niobate
The static polarization of lead magnesium niobate has been studied using a standard Sawyer-Tower circuit. The square-to-slim-loop hysteresis transition was phenomenologically modeled by modifying N\'eel's equation for the magnetization of a superparamagnet to a similar relationship for a superparaelectric. A temperatu…
Some new aspects related to the synthesis of meso‐substituted porphyrins
Abstract A general analysis of the steps of the Rothemund reaction, allowed for a better understanding and a significant improvement of this reaction as a synthetic method in some of the previously known difficult syntheses.
Long-range Finnis-Sinclair potentials for f.c.c. metallic alloys
Many-body, long-range potentials of a Finnis-Sinclair type are formulated for the atomistic description of binary f.c.c. metallic alloys. These potentials are generalizations of the scheme constructed by Sutton and Chen (1990), for the atomistic modelling of f.c.c. elemental metals. The parameters for the alloy potent…
Absorption and emission cross section of Er/sup 3+/ doped silica fibers
A detailed set of measurements is presented on determining the emission and absorption cross sections of Er/sup 3+/ doped fibers for the /sup 4/I/sub 13/2/ to /sup 4/I/sub 15/2/ transition. Two techniques are employed: the Fuchtbauer-Ladenberg analysis, based on spectroscopic data, and a more direct technique involvin…
Magnetostructural correlations in magnetically coupled (.mu.-oxo)diiron(III) complexes
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetostructural correlations in magnetically coupled (.mu.-oxo)diiron(III) complexesSergiu M. Gorun and Stephen J. LippardCite this: Inorg. Chem. 1991, 30, 7, 1625–1630Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published inissue 1 A…
Photophysical studies in solution of the tetranuclear copper(I) clusters Cu4I4L4 (L = pyridine or substituted pyridine)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotophysical studies in solution of the tetranuclear copper(I) clusters Cu4I4L4 (L = pyridine or substituted pyridine)Kevin R. Kyle, Chong Kul Ryu, Peter C. Ford, and John A. DiBenedettoCite this: J. Am. Chem. Soc. 1991, 113, 8, 2954–2965Publication Date (Print):April 1, 19…
Macromolecular engineering of polylactones and polylactides. 4. Mechanism and kinetics of lactide homopolymerization by aluminum isopropoxide
peer reviewed
Synthesis, properties, and biodegradation of poly(1,3-trimethylene carbonate)
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, properties, and biodegradation of poly(1,3-trimethylene carbonate)K. J. Zhu, R. W. Hendren, K. Jensen, and C. G. PittCite this: Macromolecules 1991, 24, 8, 1736–1740Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Published iniss…
Combined infrared and electron diffraction study of the polymorphism of native celluloses
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCombined infrared and electron diffraction study of the polymorphism of native cellulosesJunji Sugiyama, Jan Persson, and Henri ChanzyCite this: Macromolecules 1991, 24, 9, 2461–2466Publication Date (Print):April 29, 1991Publication History Published online1 May 2002Publishe…
Metallomesogens: Metal Complexes in Organized Fluid Phases
Abstract Metallomesogens , metal complexes of organic ligands which exhibit liquid crystalline (mesomorphic) character, combine the variety and range of metal‐based coordination chemistry with the extraordinary physical properties exhibited by liquid crystals. Thermotropic metallomesogens have been made incorporating…
A New Look at Electron Localization
Bonds and lone electron pairs can be made “visible” when the electron density distribution is used to calculate the electron localization function (ELF). This paper presents a computer-graphics image of ELF in colors which represent the extent of the localization (at the right a black-and-white picture of N2).
THE PHOTODEGRADATION OF PORPHYRINS IN CELLS CAN BE USED TO ESTIMATE THE LIFETIME OF SINGLET OXYGEN
NHIK 3025 cells were incubated with Photofrin II (PII) and/or tetra (3-hydroxyphenyl)porphyrin (3THPP) and exposed to light at either 400 or 420 nm, i.e. at the wavelengths of the maxima of the fluorescence excitation spectra of the two dyes. The kinetics of the photodegradation of the dyes were studied. When present…
Bond-valence parameters for solids
Bond-valence parameters which relate bond valences and bond lengths have been derived for a large number of bonds. It is shown that there is a strong linear correlation between the parameters for bonds from cations to pairs of anions. This correlation is used to develop an interpolation scheme that allows the estimati…
Isothermal heat treatment of a thermotropic LCP fiber
Abstract The effect of the heat treatment on as‐spun fibers made of a commercial liquid crystalline polymer, Vectra®, was examined through tensile properties and differential scanning calorimetry (DSC) measurements. The heat treatment increased the fiber strength considerably, and it also increased the elongation at b…
Hydrogen/liquid vapor radio frequency glow discharge plasma oxidation/hydrolysis of expanded poly(tetrafluoroethylene) (ePTFE) and poly(vinylidene fluoride) (PVDF) surfaces
Abstract Modification of fluorine‐containing polymers has recently received much attention due to new chemistries allowing for refunctionalization of these materials, especially their surfaces. In this article results are discussed which demonstrate various interesting modifications (including incorporations of OH an…