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  • 1
    facet.materialart.
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    Solid state bonding of Al2O3 with Cu, Ni and Fe: characteristics and properties (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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  • 2
    Electronic Resource
    Electronic Resource
    Some special geotechnical properties of pumice deposits (1998)
    Springer
    Bulletin of engineering geology and the environment 57 (1998), S. 41-50 
    Details
    ISSN: 1435-9537
    Keywords: Key words Pumice ; Vesuvius ; Density ; Porosity ; Landslides ; Stability
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Resumé Cet article décrit les caractéristiques des sols constitués de ponces dans la région du Vésuve et discute les différents essais concernant le comportement de ces sols vis-à-vis de l'eau dans un certain nombre de sites différents. L'attention est attirée sur la présence de vides inter aussi bien qu'intraparticulaires et les auteurs proposent des modifications du diagramme traditionnel des phases solide-eau-air pour tenir compte de ces phénomènes. L'importance d'une bonne compréhension de la structure de ces sols et de leur comportement vis-à-vis des circulations d'eau est illustrée a l'aide d'exemples de glissements et de travaux de confortement.
    Notes: Abstract  This paper describes the characteristics of pumice soils from the area of Mount Vesuvius and discusses sinking, watering and other geotechnical tests on pumice from a number of sites. Attention is drawn to the presence of both inter- and intra-particle voids within this material and appropriate modifications to the standard solid-water-air phase diagram are suggested to take account of this. The importance of understanding the structure of the pumice and its response to rainfall/ground water conditions is discussed in relation to both landslips and stabilisation works.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100640050019
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  • 3
    Electronic Resource
    Electronic Resource
    Fractal behaviour of some geological media (2000)
    Springer
    Bulletin of engineering geology and the environment 58 (2000), S. 289-295 
    Details
    ISSN: 1435-9537
    Keywords: Key words Specific surface ; Clayey soils ; ¶Pumice ; Fractal sets ; Minkowski dimension ; Mots clés Surface spécifique ; Sols argileux ; Ponces ; Ensembles fractals ; Dimension de Minkowski
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Description / Table of Contents: Résumé L'utilisation de la géométrie fractale a permis de déterminer certaines caractéristiques de matériaux tels que des sols argileux et des dépôts de ponces. En particulier, les surfaces spécifiques de quelques argiles de l'Italie du Sud et de ponces apportées par l'éruption du Vésuve de 79 a.d. ont été déterminées. L'analyse réalisée donne la dimension de Minkowski de ces sols, nombre sans dimension. Les valeurs de dimension de Minkowski ont été comparées avec des valeurs dérivées de méthodes physiques (porosimétrie au mercure et BHT). Les analyses réalisées prouvent que, dans la gamme, des grossissements utilisés, les matériaux examinés se comportent comme des ensembles irréguliers ou fractals.
    Notes: Abstract  This paper describes the use of fractal geometry in determining the characteristics of some geological media, such as clayey and pumice soils. Attention is drawn to the determination of the specific surface of some clays of southern Italy and of pumice of the Vesuvius eruption of 79 a.d. The analysis proposed gives the Minkowski dimension of soils expressed by the power law, or the equation Mδ(F)≈Cδ–s; this is a dimensionless number. The values of Minkowski dimension obtained have been compared with the values obtained by physical methods (mercury porosimetry and the bottle helium test). The analyses conducted prove that, for the range of magnification adopted, the media examined behave as irregular or fractal sets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100640000038
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  • 4
    Electronic Resource
    Electronic Resource
    Partial regularity for minimizers of convex integrals with L log L-growth (2000)
    Springer
    Nonlinear differential equations and applications 7 (2000), S. 107-125 
    Details
    ISSN: 1420-9004
    Keywords: Key words and phrases: Convex Integrals, Minimizers, L log L, Partial Regularity.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract. We prove $C^{1, \alpha}$ -partial regularity of minimizers $u\in W^{1, 1}_{loc} (\Omega; {\Bbb R}^N)$, with $\Omega\subset {\Bbb R}^n$, for a class of convex integral functionals with nearly linear growth whose model is $ \int_\Omega\log(1+|Du|)|Du|dx $ In this way we extend to any dimension n a previous, analogous, result in [FS] valid only in the case $n\leq 4$.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/PL00001420
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  • 5
    Electronic Resource
    Electronic Resource
    Forming and sintering of multiphase bioceramics (1994)
    Springer
    Journal of materials science 5 (1994), S. 651-653 
    Details
    ISSN: 1573-4838
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Technology
    Notes: Composite bioceramic materials could find use in a wide range of biomedical applications; however, their processing technologies are quite complex or not sufficiently developed. In order to eliminate deleterious influences of powder inhomogeneities and to reduce the machining time of final components, a novel procedure for multiphase powders using wet pretreatment and direct forming of green bodies having the desired geometries was studied. During the experimental work alumina, yttria-stabilized zirconia, and their mixtures were used. The forming of discs and femoral heads was done by pressure casting of aqueous suspensions of powders. The measurements of physical, mechanical and tribological properties of sintered samples were performed; the results obtained showed the effectiveness of the process since the property values approached those of similar materials actually on the market, while requiring less machining labour.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120349
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  • 6
    Electronic Resource
    Electronic Resource
    Galileo Ultraviolet Spectrometer experiment (1992)
    Springer
    Space science reviews 60 (1992), S. 503-530 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Galileo ultraviolet spectrometer experiment uses data obtained by the Ultraviolet Spectrometer (UVS) mounted on the pointed orbiter scan platform and from the Extreme Ultraviolet Spectrometer (EUVS) mounted on the spinning part of the orbiter with the field of view perpendicular to the spin axis. The UVS is a Ebert-Fastie design that covers the range 113–432 nm with a wavelength resolution of 0.7 nm below 190 and 1.3 nm at longer wavelengths. The UVS spatial resolution is 0.4 deg × 0.1 deg for illuminated disc observations and 1 deg × 0.1 deg for limb geometries. The EUVS is a Voyager design objective grating spectrometer, modified to cover the wavelength range from 54 to 128 nm with wavelength resolution 3.5 nm for extended sources and 1.5 nm for point sources and spatial resolution of 0.87 deg × 0.17 deg. The EUVS instrument will follow up on the many Voyager UVS discoveries, particularly the sulfur and oxygen ion emissions in the Io torus and molecular and atomic hydrogen auroral and airglow emissions from Jupiter. The UVS will obtain spectra of emission, absorption, and scattering features in the unexplored, by spacecraft, 170–432 nm wavelength region. The UVS and EUVS instruments will provide a powerful instrument complement to investigate volatile escape and surface composition of the Galilean satellites, the Io plasma torus, micro- and macro-properties of the Jupiter clouds, and the composition structure and evolution of the Jupiter upper atmosphere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00216866
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  • 7
    Electronic Resource
    Electronic Resource
    The influence of microstructure on the thermal conductivity of aluminium nitride (1994)
    Springer
    Journal of materials science 29 (1994), S. 5014-5022 
    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 Starting from three different commercial powders, AIN materials were densified by pressureless sintering under various temperature and time values in order to investigate the influence of microstructure on thermal conductivity. The influence of the sintering aids (3 wt% Y2O3 and 2 wt% CaC2) and of the forming processes (cold isostatic pressing and thermocompression of tape cast pieces) were also been evaluated. Thermal conductivity increased with the purity level of the starting powder and with an increasing the sintering temperature and soaking time. The highest thermal conductivity values (196 Wm−1 K−1) were obtained with the purest powder and high temperature (1800 °C) sintering over long periods (6 h). No influence on thermal conductivity was detected from the forming technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01151092
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  • 8
    Electronic Resource
    Electronic Resource
    Analysis of local heat transfer properties of tape-cast AlN ceramics using photothermal reflectance microscopy (1996)
    Springer
    Journal of materials science 31 (1996), S. 5429-5436 
    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 Photothermal reflectance microscopy was applied to the analysis of local thermal diffusivity on tape-cast AlN ceramics. The materials were obtained from three different commercial powders, two sintering temperatures (1750 and 1800 °C), and 3 wt % Y2O3 sintering aid. Owing to the high spatial resolution of the technique (∼30 μm in the present case), measurements in different positions on the sample surface were carried out. In this way a study of the homogeneity of thermal properties was performed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01159313
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  • 9
    Electronic Resource
    Electronic Resource
    Solid state bonding of Al2O3 with Cu, Ni and Fe: characteristics and properties (1998)
    Springer
    Journal of materials science 33 (1998), S. 1827-1836 
    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 A solid state bonding technique under hot pressing was used for joining alumina with thin metal sheets of Ni, Cu and Fe. The microstructure and microchemistry of the ceramic–metal interface and of the fracture interface were examined using scanning electron microscopy (SEM) energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD), in order to identify the adhesion mechanisms and the nature of strength limiting flaws. Interaction between the selected metals and alumina can be physical or physico-chemical in nature: very low amounts of interfacial compounds were formed, depending on the processing conditions and on the presence of oxygen in the system. Fracture and toughness tests indicated that high ceramic–metal interface strengths (up to 177 MPa) were achieved under the adopted processing conditions and that strength and toughness were directly related. Moreover, an increase in hardening in the metal interlayer at a distance of 2–3 μm from the interface was observed in the samples with high strength values. The mechanical behaviour was related to several factors that strongly depend on the bonding conditions: plastic deformation of the metal, metal creep, metal intrusion and diffusion into alumina, and chemical reactions at the interface. © 1998 Chapman & Hall
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004397019927
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  • 10
    facet.materialart.
    Unknown
    Fractal behaviour of some geological media (2000)
    Springer
    Details
    Publication Date: 2000-07-04
    Print ISSN: 1435-9529
    Electronic ISSN: 1435-9537
    Topics: Geosciences
    Published by Springer
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