Materials Literature
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The electroclinic effect in the smectic A phase of 4-(3-methyl-2-chlorobutanoyloxy)-4'-heptyloxybiphenyl has been investigated. Values up to 10° are obtained for the induced tilt angle, which is proportional to the applied d.c. field. The amplitude of the tilt angle modulation shows exactly the same dependence on temp…
Diffuse scattering from TiNi alloys of near equi-atomic composition is investigated by electron diffraction, and several high-resolution images produced by diffuse scattering together with some Bragg reflections are presented. Three characteristic features of diffuse scattering are as follows. (1) The maxima of the di…
Abstract The He(I α ) photoelectron (PE) spectra of the three isomeric seleno analogues 7, 8 and 11 of thieno [3,4‐ b ]thiophene have been recorded. The first four bands can be assigned to ionizations from π‐MO′s by comparing their energies with the calculated orbital energies derived from HMO and PPP calculations. Th…
The use of eeric ions for initiating graft copolymerization of vinyl monomers on cellulosic materials has been reported by several workers [1-10]. Initiation of graft copolymerization is often thought to be by radicals generated on the cellulose by the abstraction of a hydrogen atom from a carbon atom carrying hydroxy…
The polychromatic Laue method was developed for application in flash X-ray diffraction studies; it can also serve as a valuable tool for fast data acquisition with conventional X-ray and synchrotron sources. The present method was developed with a sealed X-ray tube (Mo anode, 45 kV, 20 mA) and a crystal of known struc…
Abstract 1) The J -integral is path independent in both PS and SEN specimens and equals the tearing energy. 2) The critical J -integral at initiation is less in PS specimens than in SEN specimens, because the greater biaxial stress in PS restricts the process zone. 3) At initiation, the crack-tip radius, proportional…
Surface-plasmon excitation on a corrugated Ag surface in conical (nonplanar) geometry is studied. Both p and s polarizations of the incident wave are considered. The Rayleigh method is applied to obtain the infinite set of simultaneous linear equations with respect to the reflected and transmitted amplitudes of the sp…
Summary This paper supports the use of formaldehyde at economically feasible concentrations as a biocide for EOR processes that use xanthan biopolymer. Its biocidal action against anaerobic sessile xanthan-degrading field organisms was clearly superior to three other biocides tested when 100% kill was used as the crit…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTModel reduction for two-dimensional catalyst pellets with complex kineticsAnthony G. Dixon and David L. CresswellCite this: Ind. Eng. Chem. Res. 1987, 26, 11, 2306–2312Publication Date (Print):November 1, 1987Publication History Published online1 May 2002Published inissue 1…
The analytic solutions are given for three simple axisymmetric systems involving toroidal conductors and iron. The solutions can be used for testing and gauging the accuracy of three-dimensional numerical schemes. In each case it is demonstrated how the fields can be calculated from a spherical harmonic expansion. Thi…
2-Pyrrolidinone, the lactam of gamma-aminobutyric acid (GABA), is identified as the major constituent of total GABA in human CSF. Structural elucidation was done by mass spectrometry. In lumbar CSF of four patients, 2-pyrrolidinone represented about 54% of GABA found after acid hydrolysis, thus accounting for essentia…
This study was designed to collect and characterize aerosols released during metal cutting activities typically used in decommissioning radioactively contaminated facilities. Such information can guide in the selection of appropriate control technologies for these airborne materials. Mechanical cutting tools evaluated…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicellar control of organic reactions: propellane substrates as stereochemical probes for micellar bindingAnand Natrajan, Joseph D. Ferrara, Wiley J. Youngs, and Chaim N. SukenikCite this: J. Am. Chem. Soc. 1987, 109, 24, 7477–7483Publication Date (Print):November 1, 1987Pub…
Abstract The permeability coefficients for He, O 2 , N 2 , CH 4 , and CO 2 in miscible blends of polystyrene (PS) and tetramethyl bisphenol‐A polycarbonate (TMPC) at 35°C and 1 atm driving pressure are reported. Sorption isotherms for CO 2 and CH 4 are also presented. The isotherms were fitted to the dual sorption mod…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochromic and fluorescent probe studies in glassy polymer matrices. 2. Isomerizable planar probe molecules lacking an inversion center of symmetryJohn G. Victor and John M. TorkelsonCite this: Macromolecules 1987, 20, 11, 2951–2954Publication Date (Print):November 1, 1987…
Abstract Fourier‐transform infrared spectroscopy (FTIR) shows that during the curing of PMR‐15 polyimide, formation of an anhydride intermediate occurs prior to the formation of polyamic acid, suggesting that its origin is the diester diacid starting material, as has recently been proposed by Johnston and coworkers. T…
The structure of pentagonal Frank-Kasper phases can be recovered from the projection of a common MgCu2 cube described in a six-dimensional space. From the close structural relationship between the newly discovered icosahedral quasicrystal and the Frank-Kasper phases, a structure model has been proposed for the former.
Accelerated electrochemical techniques were used to study the corrosion of carbon steel in laboratory-simulated aqueous environments representing typical produced waters from natural gas production wells. Specifically, the separate and conjoint effects of the various ionic species in the electrolyte, and the influence…
Monte Carlo simulation is used to study the elastic properties of the classical hard-sphere solid. The elastic constants ${C}_{11}$, ${C}_{12}$, and ${C}_{44}$ are computed for the fcc lattice structure at the melting density. Poisson's ratio is computed and is shown to be positive. These ``exact'' results are compare…
Abstract From the Part I experiments, n -butyl-EAB shows a strong interaction (chemisorption) with the carbon black surface. The chemical structure of chemisorbed n -butyl-EAB is similar to that of the component, with a peak at 290 nm. The EAB groups of the chain-ends in the modified polymer enhance the adsorption of…