Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLiving carbocationic polymerization. 31. A comprehensive view of the inifer and living mechanisms in isobutylene polymerizationBela Ivan and Joseph P. KennedyCite this: Macromolecules 1990, 23, 11, 2880–2885Publication Date (Print):May 1, 1990Publication History Published on…
The residual stress state of brazed ceramic/metal compounds is described by means of X‐ray residual stress determinations and analytical calculations using a model of three elastic infinite plates. It is shown that the residual stress state of the soldered compound depends on the materials combination and on the geome…
Four polycomponent systems based on LaCo13 have been studied: La(Co1−xFex)13, La(Co1−xAlx)13, La(Co1−x−yFexAly)13, and La0.7Nd0.3(Co0.7Fe0.3)13. These 1:13 systems were studied because of their potential for permanent magnet fabrication. LaCo13 has a high 3d metal content, the highest for any known rare-earth intermet…
The effects of the 56-kilodalton protease (56K protease) from Serratia marcescens on complement-derived chemotactic activity were examined. Fresh human serum was incubated with zymosan to produce C5a. This activated serum was then incubated with various concentrations of 56K protease, and the chemotactic activity of m…
A thin-layer mixed-potential model (TLMPM) is described for calculating redox and corrosion potentials for high-level nuclear waste (HLNV) canisters in a tuff repository. The model assumes that the canister surface covered by a thin liquid (water) layer, which is irradiated by γ-photons from the decay of radionuclides…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of the bonding and orientation of ethylene on palladium(111) by near-edge x-ray absorption fine structure and photoelectron spectroscopyLu Ping. Wang, Wilfred T. Tysoe, R. Mark. Ormerod, Richard M. Lambert, Helmuth. Hoffmann, and Francisco. ZaeraCite this: J. P…
Barkhausen noise (BN) measurements were made on a half-section of a pipe under tensile and compressive isostress. The RMS BN voltage was found to increase with increasing tensile stress and to decrease with increasing compressive stress. Pulse-height distribution analysis and power density spectral analyses were perfo…
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Constrained conformational energy minimizations have been used to calculate an adiabatic (phi, psi) potential energy surface for the disaccharide sucrose. The inclusion of molecular flexibility in the conformational energy analysis of this disaccharide was found to have a significant effect upon the allowed conformati…
Migration rates of radiolabelled antioxidants, Irganox-1010 (I-1010) and Irganox-1076 (I-1076), were measured from low- and high-density polyethylenes (LDPE, HDPE) and polypropylene (PP) at temperatures up to 135 degrees C. Water, 8 and 95 per cent aqueous ethanol and corn oil were employed as food simulating liquids…
Seventeen azobenzene derivatives were synthesized and their thermotropic properties were examined. They are classified into three groups. In the first group, 4-cyanobiphenyl moieties are attached t...
Thin films of BN, hard carbon, a-C:H, and SiC have been deposited onto ZnS or (100)-silicon as precursors to the growth of polycrystalline diamond films. These layers must protect the substrate from chemical attack at the deposition temperatures used in microwave plasma chemical vapor deposition (CVD) and also promote…
Surfaces of fully imidized pyromellitic, dianhydride–oxydianiline (PMDA-ODA) based polyimide films have been studied after argon ion-beam bombardment or treatment with either oxygen or nitrogen plasmas. The treated surfaces were characterized by x-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPicosecond relaxation of strongly coupled porphyrin dimersOsman. Bilsel, Juan. Rodriguez, and Dewey. HoltenCite this: J. Phys. Chem. 1990, 94, 9, 3508–3512Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990https://pu…
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufacturing, space operations, and applications of space technologies to other fields.
A series of YFe11−xTix alloys with x=0.10, 0.25, 0.40, 0.50, 0.70, 1.00, 1.25, 1.50, and 2.00 have been investigated using x-ray diffraction, thermomagnetic analysis, the singular point detection technique, and 57Fe Mössbauer spectroscopy. A pure ThMn12 -type phase was observed when 0.7≤x≤1.25. It has Curie temperatur…
Creep tests in four‐point flexure loading configuration in air employing applied stresses of 37 to 300 MPa at temperatures of 1200°, 1300°, and 1400°C were performed on 20‐vol%‐SiC‐whisker‐reinforced alumina and unreinforced single‐phase polycrystalline alumina. The creep rate of polycrystalline alumina was significan…
The ordering behavior of lanthanum‐modified lead magnesium niobate ceramics was investigated over a wide range of lanthanum content (from 0 to 50 at.%). The ordering of magnesium and niobium ions in the B site was examined by X‐ray diffraction, and the superlattice reflection was associated with the A(B′ 1/2 B″ 1/2 )O…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheory of homopolymer-block copolymer blends. The search for a universal compatibilizerT. A. Vilgis and J. NoolandiCite this: Macromolecules 1990, 23, 11, 2941–2947Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 May 1990h…
Abstract Blends of polypropylene (PP) and ethylene‐propylene rubber (EPR) and blends of polystyrene (PS) and styrene‐butadiene rubber (SBR) were prepared in a laboratory‐scale internal mixer at various blend compositions and rotor rates. Blend morphology was studied by means of electron microscopy. For each blend pair…