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  • 1
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    Development of a new forming method (pressureless powder packing forming method) and its characteristics (1998)
    Springer
    Details
    Publication Date: 1998-04-01
    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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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Production of insulin-like growth factor I (IGF-I) and IGF-binding proteins by rat intestinal stromal cells in vitro (1998)
    Springer
    Cellular and molecular life sciences 54 (1998), S. 158-166 
    Details
    ISSN: 1420-9071
    Keywords: Key words. Insulin-like growth factors; IGFs; IGFBP; stroma; epithelium; stromal-epithelial interactions.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract. To determine if intestinal stromal cells secrete diffusible factors such as insulin-like growth factors (IGFs) capable of regulating epithelial cell growth in vitro, stromal cells were isolated by enzymatic digestion of rat intestine. Incorporation of [3H]thymidine into DNA and [14C]leucine into protein of IEC-6 cells, a model intestinal epithelial cell line, was significantly increased (two- to threefold) when the IEC-6 cells were co-cultured with stromal cells, relative to IEC-6 cells grown alone. Medium conditioned by stromal cells stimulated DNA synthesis of IEC-6 cells in a dose-dependent manner. Analysis of the conditioned medium revealed that intestinal stromal cells secreted IGF-I, but little IGF-II, in addition to an M r 32,000 IGF-binding protein (IGFBP-2) and an IGFBP having M r∼ 24,000. We conclude that rat intestinal stromal cells secrete one or more diffusible factors, which may include IGF-I and IGFBPs, capable of stimulating proliferation of IEC-6 cells in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000180050137
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of cracks in aging aircraft structures, with and without composite-patch repairs (1992)
    Springer
    Computational mechanics 10 (1992), S. 169-201 
    Details
    ISSN: 1432-0924
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract In this paper, the problems of composite-patch repair of (i) center and edge-cracked panels loaded in the far-field; and (ii) cracks emanating from pin-loaded fastener holes, are examined in thorough detail. The effects of various non-dimensional design parameters on the reduction in the stress-intensity factors near the crack-tip are determined, and are presented in the form of design charts. Both analytical and numerical methods are employed in this study. In the analytical method, the cracked metallic plate was considered to be infinitely large, and the composite patch was modeled as a long orthotropic strip of finite height (in the direction perpendicular to the crack axis). Next, by using the Finite Element Alternating Method (FEAM), a more general analysis capability that can treat arbitrary shapes of the cracked metallic sheet, as well as of the composite patches, is developed. This general FEAM is applied to: (i) composite patch repairs of cracks emanating from loaded fastener holes (the MSD problem); (ii) composite patch repairs of semi-elliptical surface flaws in thick plates; and (iii) composite patch repairs of quarter-elliptical surface flaws emanating from fastener holes. Problem (i) is two-dimensional in nature while problems (ii) and (iii) are fully three-dimensional. In all these cases, the effects of various design parameters on the crack-tip (front) stress-intensity factors are fully discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00370088
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  • 4
    Electronic Resource
    Electronic Resource
    Reduced water degradation of YBaCuO by Si3N4 protective coating (1990)
    Springer
    Journal of materials science 9 (1990), S. 967-969 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00722190
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  • 5
    Electronic Resource
    Electronic Resource
    Effect of Y2O3 additions on the plasticity of sintered Cr2O3 (1988)
    Springer
    Oxidation of metals 29 (1988), S. 217-223 
    Details
    ISSN: 1573-4889
    Keywords: Oxide plasticity ; Cr2O3 ; Y2O3 additions
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract We have carried our constant strain-rate compression tests on polycrystalline Cr2O3 and Cr2O3 doped with 0.09 wt. % Y2O3 to establish whether there exists an effect of Y2O3 on the plasticity of Cr2O3. This study is motivated by previous work on the oxidation of alloys containing reactive-element additions. In that work, it has been observed that the addition of oxygen-active elements, such as Y to alloys that form Cr2O3 or Al2O3 oxide layers upon exposure at high temperature, strongly enhances the adhesion of the oxide layer to the base alloy as compared with alloys without reactive-element additions. We have found that at 1200°C (1) chromia exhibits limited plasticity at high temperatures, and (2) the presence of Y in the oxides does not enhance plasticity compared with addition-free oxides.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00751796
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  • 6
    Electronic Resource
    Electronic Resource
    Electronic transport in thermally grown Cr2O3 (1990)
    Springer
    Oxidation of metals 33 (1990), S. 31-54 
    Details
    ISSN: 1573-4889
    Keywords: Electrical conductivity ; chromium oxide ; hole mobility
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Electrical conductivity of thermally grown Cr2O3 has been measured as a function of temperature and over a range of oxygen partial pressures from that of air to that of the Cr/Cr2O3 equilibrium. The conductivity showed p-type behavior over the range of the present investigation. At temperatures above 1000°C, the conductivity values were independent of oxygen partial pressure and indicated intrinsic semiconductor behavior. The mobility of holes, determined by measuring conductivity at fixed compositions (i.e., fixed δ in Cr2-δO3), increased with temperature. This behavior can be attributed to hopping-type conduction. For δ ∼ 10−5, the activation energy for hole hopping was 0.248 eV, and the calculated hole mobilities were 5.4x10−2 and 2.4x10−1 V/cm2 · s at 500 and 1000°C, respectively. The oxidation kinetics of Cr were determined by measuring the electrical conductivity and electromotive force across the oxide layer at 875°C. The result agreed well with the oxidation data obtained in thermogravimetric tests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00665668
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  • 7
    Electronic Resource
    Electronic Resource
    Oxidation of copper and electronic transport in copper oxides (1993)
    Springer
    Oxidation of metals 39 (1993), S. 411-435 
    Details
    ISSN: 1573-4889
    Keywords: Cu oxidation ; electrical conductivity ; defect mechanism ; defect mobility ; nonstoichiometry ; copper oxides
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Oxidation of copper and electronic transport in thermally-grown large-grain polycrystals of nonstoichiometric copper oxides were studied at elevated temperatures. Thermogravimetric copper oxidation was studied in air and oxygen at temperatures between 350 and 1000°C. From the temperature dependence of the oxidation rates, three different processes can be identified for the oxidation of copper: bulk diffusion, grain-boundary diffusion, and surface control with whisker growth; these occur at high, intermediate, and low temperatures, respectively. Electrical-conductivity measurements as a function of temperature (350–1134°C) and oxygen partial pressure (10−8–1.0 atm) indicate intrinsic electronic conduction in CuO over the entire range of conditions. Electronic behavior of nonstoichiometric Cu2O indicates that the charge defects are doubly-ionized oxygen interstitials and holes. The calculated enthalpy of formation of oxygen ( $$\Delta H_{{\text{O}}_{\text{2}} }$$ ) and hole-conduction energy (EH) at constant composition for nonstoichiometric Cu2O are 2.0±0.2 eV and 0.82±0.02 eV, respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00664664
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  • 8
    Electronic Resource
    Electronic Resource
    Solid solubility of cerium as a single phase in SrS:Ce3+ phosphor (1989)
    Springer
    Journal of materials science 8 (1989), S. 285-286 
    Details
    ISSN: 1573-4811
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00725499
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of V2O5 on the electrical properties of TiO2-V2O5 humidity sensors (1994)
    Springer
    Journal of materials science 5 (1994), S. 300-304 
    Details
    ISSN: 1573-482X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract TiO2-V2O5 ceramic humidity sensors were prepared and measured to obtain the relationships between the added amount of V2O5 and the properties of the sensor elements, such as total pore volume, bulk impedance and the humidity-sensitive property in the low relative humidity region. It was observed that both the microstructure and the bulk impedance of the sensor element were strongly dependent on the added amount of V2O5. The equivalent circuit of the specimen was postulated for analysis and the sensor characteristics in low and high humidity regions are discussed. The samples which contained higher amounts of V2O5 seemed to be more strongly hygroscopic in low humidities, whereas the samples that had higher pore volumes contained water much more at high humidities.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00921256
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  • 10
    Electronic Resource
    Electronic Resource
    Sulfuric acid pretreatment for the simultaneous GC screening of organochlorine and organophosphorus pesticides in herbal essential oils (1998)
    Springer
    Chromatographia 47 (1998), S. 587-592 
    Details
    ISSN: 1612-1112
    Keywords: Gas chromatography ; Organochlorine and organophosphorus pesticides ; Herbal medicine ; Essential oils ; Sulfuric acid treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A rapid and new clean-up method utilizing sulfuric acid treatment is demonstrated to identify and quantify the level of organochlorine (OC) and organophosphorus (OP) pesticide residue concentrations in herbal essential oils by gas chromatography (GC). Essential oils fortified with pesticides, that are extracted from herbs by steam distillation are partitioned with 65% acetonitrile/water(v/v) and treated with sulfuric acid at different reaction times and sulfuric acid concentrations. Optimal conditions, to avoid interference from essential oils in gas chromatographic analysis, is 17% (v/v) of a mixed phase ratio of sulfuric acid to organic solvent (hexane/ethyl ether=9∶1, v/v) and a reaction time of 30s. The response of the flame ionization detector (FID) is linear for all pesticides determined. Recovery of pesticides from fortified herbs studied are in the range of 75% to 111% (RSD, 4% to 11%) for OC, and 72% to 116% (RSD, 2% to 11%) for OP. Although sulfuric acid treatment destroys carbamate and some organophosphorus pesticides, this method has efficiently reduced matrix interference and provides a rapid, economical clean-up method with excellent linear data having low coefficients of variation for the GC analyses of BHC isomers, DDD, DDE, DDT, chlorothalonil, chloropyrifos, tetradifon, fenitrothion, malathion, and parathion in matrices of herbal essential oils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02467500
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