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  • 1
    Monograph available for loan
    Monograph available for loan
    New York, NY : Springer
    Call number: M 08.0416
    Description / Table of Contents: Contents:Hello, world: handling spatial data in R.- Classes for spatial data in R.- Visualizing spatial data.- Spatial data import and export.- Further methods for handling spatial data.- Customising spatial data classes and methods.- Spatial point pattern analysis.- Interpolation and geostatistics.- Areal data and spatial autocorrelation.- Modelling areal data.- Disease mapping.
    Type of Medium: Monograph available for loan
    Pages: XIV, 374 S. , Ill., graph. Darst. , 235 mm x 155 mm
    ISBN: 0387781706 , 978-0-387-78170-9
    Series Statement: Use R!
    Classification: C.2.
    Location: Upper compact magazine
    Branch Library: GFZ Library
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  • 2
    Call number: PIK D 024-97-0006
    Type of Medium: Monograph available for loan
    Pages: 635 p.
    ISBN: 928274163x
    Series Statement: Report EUR 15415 EN
    Branch Library: PIK Library
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  • 3
    ISBN: 9780387781716
    Language: English
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  • 4
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1573-4846
    Keywords: heat treated silica xerogel ; gas chromatography ; surface energy ; dispersive component ; surface enthalpy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The surface free energy of a monolithic silica xerogel treated at 1000°C has been measured by inverse gas chromatography in the temperature range 25–150°C using n-alkanes. Values of the dispersive component, γS D, vary from 49.07 mJ·m−2 at 25°C to 17.20 mJ·m−2 at 150°C. The γS D value obtained at 25°C is lower than that found for amorphous and crystalline silicas but higher than that found for glass fibres meaning that the heat treatment at 1000°C changes drastically the structure of the silica xerogel showing a surface similar to a glass. However, the higher value of γS D in comparison to glass fibres can be attributed to the mesoporous structure present in the silica xerogel. In the temperature range of 60–90°C there exists an abrupt change of the γS D values as well as in the dispersive component of the surface enthalpy, h S D. Such abrupt change can be attributed to an entropic contribution of the surface free energy.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1573-4846
    Keywords: TEOS ; SiO2 ; heat ; fractal ; percolation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract The porous structure of TEOS derived silica gels was studied using nitrogen adsorption at 77 K. Silica gels were prepared using TEOS, H2O and ethanol for different molar ratios. No catalyst was used in this study. Silica gels were also heat treated up to 1000°C. The nitrogen sorption isotherms were analyzed by two models: Fractal and Percolation Theories. Using the fractal analysis approach, the surface roughness of the porous structure of silica gels was determined. The surface fractal dimension depends on the hydrolysis conditions and heat treatment. The surface fractal dimension decreases with increasing H2O/TEOS molar ratio or heating temperature. For the silica gels studied, the surface fractal dimension changed from 2.6 to 2.5 after heating the gels, and from 2.4 to 2.6 with decreasing H2O/TEOS ratio. Using the Percolation theory, we have determined the connectivity of the porous structure of silica gels. The extent of sorption hysteresis of the nitrogen isotherms reflects the connectivity of the pore network. The mean coordination number (connectivity) Z, and the linear dimension of the network,L, have been calculated from the hysteresis of the isotherms. For the as-prepared silica gels, Z was about 8 andL close to 2. On heating the gels, Z decreases to 4 andL increases to 7, results which are in accordance with the collapse of the porous network.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 26 (1991), S. 2841-2845 
    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 corrosion of SiC fibres with HNO3 has been studied. Characterization has been carried out by means of infrared spectroscopy, scanning electron microscopy and adsorption of nitrogen and benzene. Corrosion attack changes the specific surface area of the fibres and increases the surface roughness along the fibres. The microstructure of the fibres is not modified by the attack. The surface heterogeneity of the original fibres shows a different feature when the fibres have been corroded; the distribution of active sites on the surface of the fibres is changed by acid attack.
    Type of Medium: Electronic Resource
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  • 8
    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 Spherical titanium nanoparticles in the range of 60 to 500 nm have been obtained by a vapour-phase hydrolysis procedure using titanium tetrabutoxide as raw material. In this work, different parameters such as alkoxide temperature, water temperature, carrier gas flow rate, inlet pressure, vacuum and dilution of the raw material were tested. The most important parameters in order to obtain nanoparticles of low mean size were the flow rate, the alkoxide temperature and the inlet pressure. When the temperature decreases the mean size decreases obtaining nanoparticles below 100 nm when the temperature is set up to 125°C. On the other hand, as the flow rate that pass through the alkoxide increases the particle size decreases. Same behaviour is observed when the pressure inlet is increased. In all cases, these results are attributed to a minor concentration of the alkoxide (low amount of alkoxide molecules) in the gas stream. The other parameters, vacuum, water temperature and dilution of the alkoxide did not show any important influence in the particle size as the other ones. Polydispersity (broad or narrow particle size distribution) has the same trend. The alkoxide temperature and carrier flow rate generate narrow distributions while the other parameters produces broad distributions. FT-IR analysis of these nanoparticles showed that for sizes below 100 nm the alkoxide is fully hydrolysed and as the particle size increases the nanoparticle has more alkoxide or alcohol retained inside. The heat treatment of these nanoparticles produces a decreasing in the particle size and in all cases, the spherical shape is retained and no blackening in the nanoparticles of higher size is observed.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    Springer
    Journal of materials science 11 (1992), S. 1501-1503 
    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
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  • 10
    ISSN: 1573-4846
    Keywords: mercury porosimetry ; titanium ormosils ; pore structure ; interconnection
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract In this work, pore structure evolution of Ormosils containing TBT (Tetrabutyl titanate) has been characterized by means of mercury porosimetry, nitrogen adsorption and helium pycnometry. These ormosils have been prepared by the sol-gel method by the reaction of TEOS (tetraethoxysilane), PDMS (polydimethylsiloxane, silanol terminated) and TBT under acid-catalyzed conditions. The addition of TiO2 increases the volume and specific surface of secondary micropores and at the same time decreases the corresponding volumes of mesopores and macropores. The presence of TiO2 gives also a continuous decreasing in the pore connectivity being 9.7 for the ormosil without TiO2 and 4.4 for that of the higher concentration of TiO2. However, the pore length shows a significant decrease with the first addition of TiO2 changing from 9.1 to 2.2 at the higher TiO2 concentration. Pore volumes show a decrease as the TiO2 concentration is increased in the ormosil. On the other hand, density increases and porosity decreases with the TiO2 concentration. These results are in accordance with the presence of TiO2 nanoparticles in the ormosil and the size of such nanoparticles increases with the TiO2 concentration. Fractal constant has a low value, close to 2, for all different samples meaning that these ormosils can be considered as low surface roughness materials.
    Type of Medium: Electronic Resource
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