Materials Literature
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Discusses reduction of thread strength as a cause of loading in sewing. Investigates measurements of dynamic loads of the thread during seam formation and reduction of thread strength after loading in sewing. Analysis of results shows that the reduction in thread strength after loading in sewing is a function of dynam…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSequence distribution and its effect on glass transition temperatures of poly(anhydride-co-imides) containing asymmetric monomersAndrea Staubli, Edith Mathiowitz, and Robert LangerCite this: Macromolecules 1991, 24, 9, 2291–2298Publication Date (Print):April 29, 1991Publicat…
Complete active space multiconfiguration self-consistent field followed by higher-order configuration interaction calculations reveal that the ground state of Au6 is of 1A1 symmetry with a capped pentagonal structure. Similar calculations on Au−6 are also made. The 1A1g state of the neutral Au6 with a ring structure (…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSyntheses, characterization, and reactivity of manganese and rhenium dioxime complexes. X-ray crystal structure of MnII(CDO)(CDOH)2(BPh(OCH3))2, an unusual pseudoclathrochelate complex, and ReIIICl(CDO)(CDOH)2BPhS. Jurisson, L. Francesconi, K. E. Linder, E. Treher, M. F. Mal…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganometallic oxides: preparation and properties of the tetrahedral (Td) chromium cubane [(.eta.-C5(CH3)5)Cr(.mu.3-O)]4 and comparison with the D2 [(.eta.-C5H5)Cr(.mu.3-O)]4 and D2d [(.eta.-C5H4CH3)Cr(.mu.3-O)]4Frank Bottomley, Jinhua Chen, Sarajane M. MacIntosh, and Robert…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCharacterization of adsorbed 2-vinylpyridine/styrene diblock copolymers on silver surfaces using surface-enhanced Raman scatteringW. H. Tsai, F. J. Boerio, S. J. Clarson, E. E. Parsonage, and M. TirrellCite this: Macromolecules 1991, 24, 9, 2538–2545Publication Date (Print):…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTN-Alkylation and Hofmann elimination from thermal decomposition of R4N+ salts of aromatic polyamide polyanions: synthesis and stereochemistry of N-alkylated aromatic polyamidesRobert R. Burch and Lewis E. ManringCite this: Macromolecules 1991, 24, 8, 1731–1735Publication Dat…
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…