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  • 1
    Electronic Resource
    Electronic Resource
    Structure and properties of the metal–liquid interface (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 6271-6280 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Theoretical results are given for simple dipolar liquids in contact with a metallic slab. The metal is treated by employing a jellium model together with density functional (DF) theory. The liquid structure at the interface is given by the reference hypernetted-chain (RHNC) approximation. The liquid and metal interact electrostatically and the coupled DF/RHNC equations are solved iteratively to obtain electron density distributions and metal–liquid correlation functions which are completely self-consistent. The electron density, liquid structure, and potential drop across the interface are discussed in detail. It is found that dipoles in contact with the metal prefer to orient perpendicular to the surface with their positive ends out. This is in accord with earlier calculations for dipolar monolayers on metal surfaces. Further from the surface, the dipolar orientations oscillate and the liquid structure rapidly decays to the bulk fluid limit.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468381
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  • 2
    Electronic Resource
    Electronic Resource
    Effects of surface hydrogen on the air oxidation at room temperature of HF-treated Si (100) surfaces (1990)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 56 (1990), S. 451-453 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Thermally stimulated desorption and x-ray photoelectron spectroscopy were used to study the air oxidation at room temperature of HF-treated Si(100) surfaces. The desorption results indicated an appreciable density of hydrogen at the surface. Air oxidation experiments with predesorbing surface hydrogen were carried out and an obtained linear relationship between the amount of H2 desorption and oxidation indicated that the oxidation was allowed by H2 desorption. The surface hydrogen was also found to be stable in air at room temperature and to contribute to a retardation in air oxidation of the surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.102762
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  • 3
    Electronic Resource
    Electronic Resource
    Concentration factors of plutonium and americium for marine products (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 138 (1990), S. 331-336 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract For a realistic dose estimation, we derived the concentration factors (CF) of plutonium and americium for the field measurements of marine products and ambient coastal sea water. The distribution of the concentration ratios (CR) between the concentration in marine products and that in ambient sea water shows a lognormal distribution. The concentration factors of plutonium and americium which are derived as the geometric mean of CR values, are 231 and 67 for whitebait, 12 and 37 for flatfish, 350 and 220 for brown algea, 140 and 670 for shell fish, 27 and 130 for cephalopods, and 250 and 550 for crustaceans, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02039856
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  • 4
    Electronic Resource
    Electronic Resource
    Low level measurements of129I in environmental samples (1990)
    Springer
    Journal of radioanalytical and nuclear chemistry 138 (1990), S. 187-192 
    Details
    ISSN: 1588-2780
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Notes: Abstract An analytical method for the determination of127I and129I in various environemntal samples has been developed. The method consists of the separation of iodine from the samples using a double layered quartz tube firing apparatus, post-irradiation purification of iodine, and measuring126I and130I by means of gamma spectrometry. The relative standard deviations of this method was less than 6%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02049362
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  • 5
    Electronic Resource
    Electronic Resource
    Triphasic vascular effects of thiol compounds and their oxidized forms on dog coronary arteries (1993)
    Springer
    Cellular and molecular life sciences 49 (1993), S. 47-50 
    Details
    ISSN: 1420-9071
    Keywords: Thiol compounds ; SH-group-containing compounds ; disulfides ; effects on coronary arteries ; vascular smooth muscle ; triphasic response
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The vascular effects of 2-mercaptoethanol, cysteamine, L-cysteine, glutathione (GSH), cystamine and oxidized GSH (GSSG) on the isometric tension of isolated dog coronary arterial strips were examined, and these effects were compared with the triphasic response induced by dithiothreitol (DTT); a rapid and weak contraction (phase A), an intervening slow relaxation (phase B) and a slowly-developing strong contraction (phase C) which we previously reported. The responses of the arteries induced by 2-mercaptoethanol, cysteamine and L-cysteine consisted of phases A, B and C. The order of contractile potency (ED50 of phase C) was DTT≈L-cysteine〉2-mercaptoethanol≈cysteamine, while the order of relaxant potency (ED50 of phase B) was DTT〉cysteamine≈2-mercaptoethanol. GSSG and cystamine mainly produced relaxation, which corresponded to phase B. The phase C contraction was specific to the reduced forms of thiols, except for GSH, which produced only relaxation. The participation of endothelial cells was not essential for the contracting or relaxing effects of the thiol compounds. The phase C contraction was depressed by W-7, a calmodulin antagonist, while phase A was not. Therefore calmodulin-dependent protein kinases may participate in phase C, not in phase A.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01928788
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  • 6
    Electronic Resource
    Electronic Resource
    Toughness enhancement by polycarbosilane coating on SiC whiskers incorporated in Si3N4 matrix composite (1993)
    Springer
    Journal of materials science 28 (1993), S. 5770-5774 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Si3N4 matrix composite was fabricated by hot pressing with 20% SiC whiskers coated with polycarbosilane (PCS). The preceramic polymer on the whiskers was pyrolysed during sintering to form a carbon-rich layer at the whisker/matrix interface. Mechanical properties were measured, and compared to those of the composites with whiskers purified with HCl and HF. Elastic modulus and bending strength of the composite with PCS-coated whiskers were lower than those of the composites with other whiskers. Fracture toughness was measured by single-edge notched beam (SENB) and single-edge precracked beam (SEPB) methods. The toughness, including crack-growth resistance measured by the SEPB method, increased from 7.2 MPam1/2 to 7.9 MPam1/2 by PCS-coating on the whisker, while the toughness measured by the SENB method decreased from 6.5 MPam1/2 to 5.7 MPam1/2. The layer derived from PCS facilitated debonding at the whisker/matrix interface and activated the wake-toughening. Optical microscopic observation of the crack propagation near the interface confirmed enhancement of interfacial debonding by the PCS-coating.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365180
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  • 7
    Electronic Resource
    Electronic Resource
    Some properties of aluminium nitride powder synthesized by low-pressure chemical vapour deposition (1993)
    Springer
    Journal of materials science 28 (1993), S. 1631-1638 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Aluminium nitride (AIN) powders were synthesized by a low-pressure chemical vapour deposition, i.e. reactions of vaporized aluminium with various compositions of NH3-N2 gases at 1050°C under a pressure of 0.1–1.3 kPa. The properties of the resulting powders were divided into three categories, according to the NH3 content in the NH3-N2 gases: (i) 0 ⩽ NH3 〈 40%, (ii) 40⩽NH3⩽60%, and (iii) 60〈NH3⩽100%. In Region (i), the unreacted aluminium adhered to the AIN crystallites to form spherical primary particles; in Region (ii), the spherical agglomerates with diameters of 0.2–0.5 μm, composed of primary particles, were present as minimum units of secondary particles; in Region (iii), the crystal growth of AIN was enhanced with increasing NH3 contents. The primary particles formed by the reaction of aluminium vapour with NH3-N2 gases containing NH3⩾40% were single crystals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00363359
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  • 8
    Electronic Resource
    Electronic Resource
    Densification and microstructure development during the sintering of submicrometre magnesium oxide particles prepared by a vapour-phase oxidation process (1993)
    Springer
    Journal of materials science 28 (1993), S. 719-728 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The densification behaviour and microstructure development of MgO compacts fired from room temperature up to 1700°C at a heating rate of 10°C min−1 were examined. Starting materials were seven kinds of MgO powder with primary particle sizes ranging from 11–261 nm; these powders were produced by a vapour-phase oxidation process. The original powders contained agglomerates, due to the spontaneous coagulation of primary particles, which ranged in size from 100–500 nm. The MgO compacts densified during firing by three types of sintering: sintering within agglomerates; sintering between agglomerates and grains; and rearrangement of agglomerates and grains. The MgO compact with the lowest primary particle size (11 nm) densified by the first and second types of sintering, but the effects of these two types of sintering decreased when the primary particle size became 44 nm; here the rearrangement of agglomerates and grains primarily contributed to densification of the compact. All three types of densification became less complete with further increases in primary particle size up to 261 nm. The relative densities of the MgO compacts with smaller primary particle sizes (11–44 nm) became 96–98% when the compacts were fired up to 1700°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151248
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  • 9
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    Toughness enhancement by polycarbosilane coating on SiC whiskers incorporated in Si3N4 matrix composite (1993)
    Springer
    Details
    Publication Date: 1993-11-01
    Print ISSN: 0022-2461
    Electronic ISSN: 1573-4803
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Published by Springer
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  • 10
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    Structure and properties of the metal–liquid interface (1994)
    American Institute of Physics
    Details
    Publication Date: 1994-10-01
    Print ISSN: 0021-9606
    Electronic ISSN: 1089-7690
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics
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