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  • Articles  (194)
  • 2015-2019  (59)
  • 2010-2014  (102)
  • 1990-1994  (17)
  • 1980-1984  (12)
  • 1965-1969  (4)
  • Geosciences  (162)
  • Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics  (32)
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  • Articles  (194)
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  • 1
    Electronic Resource
    Electronic Resource
    Hydrogen bonding in basic copper salts: a spectroscopic study of malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4 (1993)
    Springer
    Physics and chemistry of minerals 20 (1993), S. 27-32 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract Infrared and Raman spectra of the basic copper salts malachite, Cu2(OH)2CO3, and brochantite, Cu4(OH)6SO4, as well as of deuterated and 13C substituted samples are presented and discussed in terms of group theory and the hydrogen bonds present. The main results are that (i) the hydrogen donor strengths of the OH− ions are strongly increased due to the very great synergetic effect of the copper ions, (ii) the acceptor strengths of the H-bond acceptor groups (SO4 2-, CO3 2-, and OH− ions) are significantly modified by the linkage and coordination of the acceptor atoms — this complicates true assignment of the OH bands observed to the two and six different OH− ions present in malachite and brochantite, respectively -, and (iii) the Cu — O stretching modes at 430–590 cm−1 and 420–520 cm−1 for malachite and brochantite, respectively, exhibit strong, partially covalent Cu — O bonding.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00202247
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  • 2
    Electronic Resource
    Electronic Resource
    Structure of trimethyl 8,13-diphenyl-13-azatricyclo[8.2.1.02,7]trideca-2(7),3,5,11-tetraene-10,11,12-tricarboxylate, C30H27NO6 (1984)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 40 (1984), S. 1626-1628 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270184008945
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  • 3
    Electronic Resource
    Electronic Resource
    Generation of acoustic surface waves on GaAs by photoexcitation (1982)
    Springer
    Applied physics 28 (1982), S. 211-214 
    Details
    ISSN: 1432-0630
    Keywords: 78.35 ; 68.30
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In the experiments reported here we observed the generation of non-thermal, large amplitude acoustic surface waves at GHz frequencies on the surface of a GaAs crystal under intense illumination with 514.5 nm radiation from an Ar+ laser at room temperature. The acoustic surface waves were detected by optical Brillouin spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618696
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  • 4
    Electronic Resource
    Electronic Resource
    Experimental investigations on two-phase flow past a sphere using digital Particle-Image-Velocimetry (1993)
    Springer
    Experiments in fluids 14 (1993), S. 296-304 
    Details
    ISSN: 1432-1114
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Digital Particle-Image-Velocimetry was applied to investigate particle trajectories in a gas flow past a sphere. The particle displacement was determined by autocorrelation analysis of image sections. To enhance the signal/noise ratio a synthetic image with idealized particle pictures was generated from the real image. The autocorrelation function (ACF) was calculated using the Fast Hartley Transformation (FHT). The desired secondary maximum of this function was detected by an algorithm with subpixel resolution. A data validation step testing the plausibility of the velocity vectors completes the image analysis. Particle trajectories are traced with help of the particles' velocity vectors. The particle deposition on a sphere can be deduced from the course of these trajectories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00189487
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  • 5
    Electronic Resource
    Electronic Resource
    Evidence of a 50-year increase in tropospheric ozone in Upper Bavaria (1994)
    Springer
    Annales geophysicae 12 (1994), S. 1197-1206 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract In a series of ozone-sonde soundings at the Hohenpeißenberg observatory, starting in 1967, the most striking features are increases of \sim2.2% per year in all tropospheric heights up to 8 km during the past 24 years. These facts have recently been published and discussed by several authors. In this paper, we present some evidence for the increase of tropospheric ozone concentrations during the past 50 years 1940–1990 in the territory of the northern edge of the Bavarian Alps, including the Hohenpeißenberg data. In December 1940 and August 1942, probably the first exact wet-chemical vertical soundings of ozone up to 9 km height were made by an aircraft in the region mentioned. These results were published in the earlier literature. We have converted the results of the flights on 4 days in December 1940 and on 6 days in August 1942 to modern units and have compared them with the Hohenpeißenberg ozone-sonde data of the December and August months. We also compared the data at the ground with the August results of Paris-Montsouris 1886-1898. Our results show an increase of ozone concentration at all tropospheric heights in Upper Bavaria during the past 50 years, compared with the Montsouris data in August during the past 105 years. In the recently published papers, the increases since 1967 were approximated linearly.Our results, extended to the past, show non-linear trends, with steeper increases since 1975-1979. Possible reasons for these findings are discussed. Quite recently (in case of the December months since 1986/87, the August months since 1990), the ozone mixing ratios at and above Hohenpeißenberg seem to have decreased.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-994-1197-7
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  • 6
    Electronic Resource
    Electronic Resource
    Mössbauer and high field magnetization studies of the solid solution CoFexAl2-xO4 (1982)
    Springer
    Physics and chemistry of minerals 8 (1982), S. 206-211 
    Details
    ISSN: 1432-2021
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Abstract By means of paramagnetic Mössbauer spectra the cation distribution of the solid solution CoFe x Al2−x O4 with 0≦x≦1.5 has been determined. The existence of high field magnetic susceptibility at low temperature for samples with x≧0.4 has been interpreted in terms of non-collinear ferrimagnetic arrangements. Below the Neel temperature the spinel CoAl2O4 has a complex antiferromagnetic behavior.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00309479
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  • 7
    Electronic Resource
    Electronic Resource
    Trace gas measurements during aircraft flights in the tropopause region over Europe and North Africa (1984)
    Springer
    Journal of atmospheric chemistry 2 (1984), S. 133-143 
    Details
    ISSN: 1573-0662
    Keywords: Trace gases ; methane ; carbon monoxide ; nitrous oxide ; distribution ; tropospheric-stratospheric exchange
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Geosciences
    Notes: Abstract During aircraft flights in May 1981 from Munich (40°N) to north of the Spitsbergen Islands (82°N) and to Monrovia, Liberia (6°N), air samples were obtained in the altitude range of 8 to 11 km and during the ascents and descents near the airports. These samples have been analyzed for the trace gas mixing ratios of CH4, CO and N2O. The results of these analyses are presented and discussed. The results provide new evidence of tropospheric-stratospheric exchange events in the vicinity of the subpolar and subtropical tropopause foldings and possibly show a case of transport of CO-enriched air in the upper troposphere above the North Atlantic Ocean.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00114127
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  • 8
    Electronic Resource
    Electronic Resource
    Adsorption of fish oil and poly(vinylbutyral) onto aluminum oxide particles studied by light scattering (1991)
    Springer
    Colloid & polymer science 269 (1991), S. 1077-1085 
    Details
    ISSN: 1435-1536
    Keywords: Aluminum oxide ; adsorption ; light scattering ; fish oil ; poly(vinylbutyral)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of added poly(vinylbutyral) (PVB) and oxidized Menhaden fish oil (O-FO) on dilute suspensions of Al2O3 in the azeotropic solvent mixture 73/27 Wt.-% trichloroethylene/ethanol were studied by static (SLS) and dynamic light-scattering (DLS). The DLS correlation function consisted of four terms from: 1) interdiffusion of the two solvents, 2) diffusion of Al2O3, 3) diffusion of added O-FO and/or PVB, and 4) an induced velocity of particles through the scattering volume due to “laser pressure.” The amplitude and relaxation time of all terms could be determined. Addition of PVB to the Al2O3 suspension resulted in an increase in particle size corresponding to the adsorption of a monolayer of coils. Addition of O-FO to the Al2O3 suspension did not produce a significant increase in particle size, indicating either no adsorption or a compact conformation of O-FO molecules on the Al2O3 surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00654114
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  • 9
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1965)
    Springer
    Colloid & polymer science 206 (1965), S. 168-176 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , 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/BF01500236
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  • 10
    Electronic Resource
    Electronic Resource
    Buchbesprechungen (1968)
    Springer
    Colloid & polymer science 224 (1968), S. 172-186 
    Details
    ISSN: 1435-1536
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , 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/BF01533974
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