Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDielectric relaxations of poly(fluoroalkyl methacrylates) and poly(fluoroalkyl .alpha.-fluoroacrylates)Shun Koizumi, Kenji Tadano, Yuji Tanaka, Tetsuo Shimidzu, Shoichi Kutsumizu, and Shinichi YanoCite this: Macromolecules 1992, 25, 24, 6563–6567Publication Date (Print):Nove…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanistic studies of group transfer polymerization. Silyl group exchange studiesRoderic P. Quirk and Jie RenCite this: Macromolecules 1992, 25, 24, 6612–6620Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November…
The tensile properties of three carbon matrix composites reinforced with SiC (Nicalon) fibers (materials A, B, C) have been measured with and without notches. One of the three materials (material B) had a relatively low strength and exhibited notch brittleness. This material had both a high interface sliding stress an…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis, reactivity, and dynamic behavior of a boron-containing silsesquioxaneFrank J. Feher, Theodore A. Budzichowski, and Joseph W. ZillerCite this: Inorg. Chem. 1992, 31, 24, 5100–5105Publication Date (Print):November 1, 1992Publication History Published online1 May 200…
Electron-beam induced deposition (EBID) of tungsten from the precursor gas W(CO)6 was investigated with the aim of enhancing the growth rate of the process. By varying dwell and loop time over a limited range, experimental deposition rates were compared to a time dependent model developed to describe the focused ion b…
From the systematic replacements of amino acid residues of Escherichia coli ribonuclease HI with those of its thermophilic counterpart, the basic protrusion domain including region 6 (R6) from residues 91 to 95 was found to increase the structural stability of the mutant protein (Kimura, S., Nakamura, H., Hashimoto, T…
Barnacle adhesion measurements provide an excellent method of assessing the foul release characteristics of non‐toxic surfaces. This paper describes both tensile and shear force methods that have been developed for field applications. Selected data are presented and the results discussed with respect to the variables…
Cobalt was incorporated by direct synthesis into three distinct kinds of microcrystalline microporous aluminophosphates (ALPOs): the large-pore ALPO-5 (free diameter ca. 7 angstrom), medium-pore ALPO-11 (free diameter ca. 6 angstrom), and small-pore ALPO-21 (free diameter < 4 angstrom) molecular sieves. All three p…
The results of two‐step oxidation experiments on chemically‐vapor‐deposited Si 3 N 4 and SiC at 1350°C show that a correlation exists between the presence of a Si 2 N 2 O interphase and the strong oxidation resistance of Si 3 N 4 . During normal oxidation, k p for SiC was 15 times higher than that for Si 3 N 4 , and t…
Abstract The local magnetic moments and hyperfine fields on the crystallographically different Fe and Y sites and on the interstitial atoms Z are calculated for the technologically important hard magnetic compounds Y 2 Fe 17 and Y 2 Fe 17 Z 3 with Z = H, C, N by means of the local‐spin‐density approximation and the li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrotris(3-neopentylpyrazol-1-yl)borates: a new type of sterically hindered poly(pyrazolyl)boratesJ. C. Calabrese and S. TrofimenkoCite this: Inorg. Chem. 1992, 31, 23, 4810–4814Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTEffect of anion polarization on conductivity behavior of poly(ethylene oxide) complexed with alkali saltsS. Besner, A. Vallee, G. Bouchard, and J. Prud'hommeCite this: Macromolecules 1992, 25, 24, 6480–6488Publication Date (Print):November 1, 1992Publication History Publishe…
Using polarization microscopy, we have investigated the director configurations of droplets of a nematic liquid crystal with negative dielectric anisotropy and perpendicular boundary conditions subjected to electric fields. The droplets were suspended in liquid poly(dimethyl siloxane) and electric fields were applied…
A previously unknown collagen cDNA clone, PF19, was isolated from a human placenta library. The 2.1-kilobase insert has a complete open reading frame of 709 amino acids that includes 12 amino acids of the NH2-terminal domain, a principally collagenous region of 577 residues, and 120 residues of the noncollagenous COOH…
We have measured the dielectric response, \ensuremath{\varepsilon}\ifmmode \tilde{}\else \~{}\fi{}(\ensuremath{\omega}), in o-terphenyl due to the secondary relaxations that occur below the glass-transition temperature. We have found that the imaginary part of \ensuremath{\varepsilon}\ifmmode \tilde{}\else \~{}\fi{}(\…
Pyrococcus furiosus is a marine hyperthermophile that grows optimally at 100 degrees C. Glutamate dehydrogenase (GDH) from P. furiosus is a hexamer of identical subunits and has an M(r) = 270,000 +/- 5500 at 25 degrees C. Electron micrographs showed that the subunit arrangement is similar to that of GDH from bovine li…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAggregation behavior of Pluronic P-94 in waterP. Bahadur and K. PandyaCite this: Langmuir 1992, 8, 11, 2666–2670Publication Date (Print):November 1, 1992Publication History Published online1 May 2002Published inissue 1 November 1992https://pubs.acs.org/doi/10.1021/la00047a01…
Optical-conductivity spectra have been measured on the correlated electron system ${\mathrm{Sr}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{La}}_{\mathit{x}}$${\mathrm{TiO}}_{3}$ (0\ensuremath{\le}x\ensuremath{\le}1) in order to determine how the electronic structure depends on the filling of the 3d-electron condu…
Quantitative X-ray diffraction measurements made over a temperature range 16–300K on a Pd sample of 8·3nm median grain size were compared with data acquired from a coarse-grained Pd reference sample. The larger Debye-Waller parameter of nanocrystalline Pd was found to be due to increased static displacements of atoms…
A novel method of function minimization that combines the power of the diagonal approximation to the normal matrix with conjugate directions is described. This method approaches closer to the local minimum than the methods that are commonly used in macromolecular refinement. The weakness of the current methods are ana…