Materials Literature
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Absorption spectra and light-induced absorbance changes of crystals from Rhodopseudomonas viridis reaction centers are recorded. A theoretical analysis of the absorption and circular dichroism spectra is presented, yielding a consistent picture of spectroscopic and structural information.
The latest in a series on crystallographic computing, this collection of 33 papers covers the full spectrum of computer applications in crystallography, including the use of micro-, mini-, and mainframe computers. Special emphasis is given to single crystal and powder data collection, including position sensitive dete…
Abstract The lattice thermal conductivity of ZnS :Fe 2+ and CdTe: Fe 2+ is analysed on the basis of Callaway's formalism with an emphasis on resonant scattering of phonons from the magnetic levels of the Fe 2+ ions. The resonant scattering of E‐mode phonons corresponding to the T 1 → T 3 transition and T 2 ‐mode phono…
Abstract A 50 mm twin screw extruder was used to study the melting profiles of various PVC formulations. Melt temperature and degree of flux are measured axially along various mixing paddle arrangements. The viscous work is correlated with the rheology of the PVC mass and effective shear rate of the intermeshing co‐ro…
Powder metallurgy dispersions of uranium silicides in an aluminum matrix have been developed by the international Reduced Enrichment for Research and Test Reactors program as a new generation of proliferation-resistant fuels. A major issue of concern is the compatibility of the fuel with the matrix material and the di…
As a consequence of their structure, modal formulations for diffraction gratings may satisfy reciprocity and conservation of energy criteria exactly, independently of the errors incurred when using truncated field expansions. We consider completeness relations, which provide a means of assessing truncation errors in m…
The dynamic and equilibrium swelling behavior of polystyrene microparticles crosslinked with divinyl benzene was investigated in methyl ethyl ketone and cyclohexane. The dynamic studies gave new information about the mechanism of penetrant transport in this polymer. The equilibrium studies were used to determine impor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotoisomerization of 2-(trimethylsilyl)pyrrolesThomas J. Barton and Gregory P. HussmannCite this: J. Org. Chem. 1985, 50, 26, 5881–5882Publication Date (Print):December 1, 1985Publication History Published online1 May 2002Published inissue 1 December 1985https://pubs.acs.or…
Abstract The inclusion of Re in Pt‐Re‐Al 2 O 3 reforming catalysts to improve the lifetime is known, but how rhenium functions and how it is disposed in the catalyst remain unclear. These fundamental questions have been attempted in this study by the use of proton‐induced X‐ray emission and Rutherford backscattering s…
The visual and electrical effects of arced SF6 gas on epoxy spacers with various fillers are examined. Field experience and laboratory investigations into the dielectric degradation of epoxy spacers and maintenance techniques for identifying serious loss of dielectric withstand are discussed. Rehabilitation of damaged…
Abstract Ultrasonic absorption, velocity, adiabatic compressibility, relaxation time and relaxation amplitude measurements are reported on poly(vinyl chloride) (PVC) solution in tetrahydrofuran (THF) using pulsed ultrasonic apparatus operating at 2 MHz and 313 K. Results show a linear increase of velocity. density, vi…
Abstract Novel photochromic compounds, indolinospirobenzothiopyrans, were prepared and their properties in polymer films were examined. The absorption bands of the colored form lie around 100 nm deeper in the long-wave region of the spectrum than are the case with the common spiropyrans.
The stationary spatial correlations of the director field of a nematic liquid crystal near the Freedericksz transition in a magnetic field with a time-dependent random component are studied by means of a stochastic dynamical model. A correlation length is shown to diverge at a shifted instability point.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of ethanol and acetaldehyde on silica-supported platinum catalysts: preparative and pretreatment effects on catalyst selectivityMasatoshi Nagai and Richard D. GonzalezCite this: Ind. Eng. Chem. Prod. Res. Dev. 1985, 24, 4, 525–531Publication Date (Print):December 1…
In this paper a theory is developed for K iscc based on hydrogen induced fracture due to plastic flow on a localized scale within the crack-tip plastic zone. The theory is qualitatively and quantitatively consistent with experimental data on the influence of yield strength and hydrogen content on the threshold level a…
Abstract An intumescnt material has been developed, based on alkali silicates, which can be used in fire protection in the form of sheets or boards which can be joined to various materials, ranging from wood and wood products to metal. The swelling of the material on heating to over 100°C or on contact with a flame is…
Tenfold twins have been found in a splat-quenched NiZr alloy by selected-area electron diffraction, dark-field and high-resolution electron microscopy. The NiZr phase has a C-centred orthorhombic lattice and the twinning plane is either (110) or (100) with an angle of about 36° between these two planes. The relationsh…
Abstract The sulfation rates of reagent grade calcium and zinc oxides and technical grade magnesium oxide with sulfur trioxide and sulfur dioxide ‐ oxygen mixtures have been measured thermogravimetrically. Experiments have been conducted to determine the rate of reaction for various particle radii (0.071‐0.151 mm), te…
A numerical method has been devised which enables the simultaneous changes of solute distribution in the solid and the liquid in the solidifying volume between secondary dendrite arms to be described. Simplifying assumptions are made in the geometric model, but not of solid or liquid diffusivities. A previously used f…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMolecular distortions and solid-state cadmium-113 NMR: crystal and molecular structure of the piperidine adduct of (5,10,15,20-tetraphenylporphyrinato)cadmium(II), cadmium-113 NMR solution and solid-state spectra and potential energy calculationsP. F. Rodesiler, E. A. H. Gri…