Materials Literature
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Intergranular corrosion in copper bicrystals with symmetrical [110] tilt boundaries and in Cu-9 at.% Al alloy bicrystals with symmetrical [110] and [100] tilt boundaries was investigated by examining the depths of corrosion grooves developed at the boundaries after an immersion test in acid solutions (modified Livings…
A new method of pulse sharpening is described in which the risetime of a high-voltage pulse is progressively reduced as it propagates along a uniform lumped-element delay line containing nonlinear ferroelectric capacitors. The capacitors are made from a barium-titanate-based ceramic dielectric whose relative permittiv…
The R ‐curve behavior of hot‐pressed silicon nitride reinforced with silicon carbide whiskers is investigated from room temperature to 1300°C using the chevron‐notch bend test. The bridging stress, estimated from increment of fracture resistance in the rising R ‐curve, is discussed in relation to tensile strength meas…
The active site of dienelactone hydrolase (DLH), a microbial enzyme of the beta-ketoadipate pathway, has been conclusively located using a combination of crystallographic, biochemical, and genetic techniques. DLH hydrolyzes a dienelactone to maleylacetate and has esterase activity on p-nitrophenyl acetate and trans-ci…
Abstract Magnetic susceptibility and ESR studies on high-spin (S=3⁄2) tetrahedral cobalt(II)–thiolate complexes were performed for A2[Co(SPh)4]; A=Me4N (1a), Et4N (1b), Ph4P (1c) and (Et4N)2[Co(SR)4]; R=C6H4-p-Me (2), C6H4-p-Cl (3), C6F5 (4). It was found that the magnitude of zero-field splitting and the anisotropy o…
Demonstration de la possibilite d'observer une difference dans les courbes f'(E) pour deux etats d'oxydation differents d'un element dans un compose de valence mixte, a proximite d'un seuil d'absorption approprie. Cette methode a l'avantage de fournir des informations, en etant selective sur le site
${\mathrm{KTa}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Nb}}_{\mathit{x}}$${\mathrm{O}}_{3}$ (KTN) in an intermediate-concentration range (x=15.7%) has been studied using dielectric-constant and spontaneous-polarization measurements. A large peak in the dielectric constant (${\mathrm{\ensuremath{\epsilon}}}_{\m…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExperimental and theoretical study of near-infrared absorbing naphthoquinone methide dyes with a nonplanar geometryYuji Kubo, Katsuhira Yoshida, Masafumi Adachi, Shinichiro Nakamura, and Shuichi MaedaCite this: J. Am. Chem. Soc. 1991, 113, 8, 2868–2873Publication Date (Print…
ABSTRACT Palatal pressures of gelatin gel at various concentrations were detected by pressure transducers set at three locations in the palate. The following parameters were derived from the palatal pressure patterns: P, mean of palatal pressure from the beginning of eating to the end of swallowing; S, the last pulse…
Milkweed, a perennial plant that can adapt to adverse soil conditions, is being developed as an alternative crop. Fiber characterization and potential market iden tification are critical to its development. The most promising commercial use for milkweed floss is as a loose fill for jackets and comforters. The purpose…
Abstract Strapped porphyrins were prepared directly by the acid-catalyzed condensation reaction of 3,3′-diethyl-4,4′-dimethyl-2,2′-dipyrrylmethane and methylenedioxy bridged dialdehydes having a strap linkage longer than 7 atoms. Dimeric and trimeric porphyrins with coplanar and orthogonal (T-shape) geometries were al…
Abstract The modification of the external surface area and the two types of microporosity of palygorskite (structural and interfiber porosity) were examined as a function of the temperature of a vacuum thermal treatment to 500°C. The methods used included: controlled-transformation-rate thermal analysis, N 2 and Ar lo…
The switching characteristics and the electro-optic response due to the electroclinic effect in chiral smectic A liquid crystals are analysed theoretically. We give an exact analytic solution to the dynamic equation of the tilt angle (θ) up to the θ4 term in the Landau expansion of the free energy. The non-linear beha…
High-resolution lattice image observations have been performed for dislocations and deformation twins, introduced by mechanical grinding, in TiO2 and SnO2 crystals with the rutile structure. Dislocations with Burgers vector b = [101] are dissociated into two halves on the (101) plane, while those with b = [001] are no…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSubstrate temperature effects on film chemistry in plasma deposition of organics. I. Nonpolymerizable precursorsGabriel P. Lopez and Buddy D. RatnerCite this: Langmuir 1991, 7, 4, 766–773Publication Date (Print):April 1, 1991Publication History Published online1 May 2002Publ…
Traditionally high electrical stress of insulation occurs in HV equipment. Usually this stress is 50/60 Hz AC and rather seldom DC. Exceptional situations may occur in RF transmitters. This is very different in low voltage equipment. Due to the increased use of high-power semiconductors with high cutoff frequency, wor…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPoly[(aryloxy)carbophosphazenes]: synthesis, properties, and thermal transition behaviorHarry R. Allcock, Suzanne M. Coley, Ian Manners, Oskar Nuyken, and Gerhard RennerCite this: Macromolecules 1991, 24, 8, 2024–2028Publication Date (Print):April 1, 1991Publication History…
New compounds bearing two dihydrogen phosphate groups and two long‐ chain alkyl groups (octyl or decyl) were prepared in good yields by the reaction of 1,ω‐ bis (alkyloxymethyl)‐ oligo (ethylene glycol)s with polyphosphoric acid. Amphipathic di‐ or tetrasodium phosphates were obtained by neutralization of the free aci…
The crystal structures of ribonuclease from Streptomyces aureofaciens (RNase Sa) and its complex with 3'-guanylic acid (guanosine 3'-monophosphate, 3'-GMP) have been determined by the method of isomorphous replacement. The atomic parameters have been refined by restrained least-squares minimization using data in the r…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReaction between chitosan and cellulose on biodegradable composite film formationJun Hosokawa, Masashi Nishiyama, Kazutoshi Yoshihara, Takamasa Kubo, and Akira TerabeCite this: Ind. Eng. Chem. Res. 1991, 30, 4, 788–792Publication Date (Print):April 1, 1991Publication History…