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  • Springer  (114)
  • Elsevier  (85)
  • American Physical Society  (25)
  • 1995-1999  (111)
  • 1990-1994  (113)
  • 1
    Electronic Resource
    Electronic Resource
    Thermodynamic properties of binary mixtures of 2-hexanone withn-alkanes at 35°C (1990)
    Springer
    Journal of solution chemistry 19 (1990), S. 1095-1102 
    Details
    ISSN: 1572-8927
    Keywords: Binary organic mixtures ; alkanone+n-alkane ; excess molar enthalpies ; excess molar volumes ; group contribution model ; 2-hexanone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Excess molar enthalpies h E and excess molar volumes v E of the binary liquid mixtures 2-hexanone+n-alkane (from n-heptane to n-decane) have been determined for various values of the mole fraction of hexanone at 35°C and atmospheric pressure. Excess molar enthalpies were determined by Calvet microcalorimetry and v E from densities measured by vibratingtube densimetry. The results are compared with the predictions of several group contribution models.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649454
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  • 2
    Electronic Resource
    Electronic Resource
    Excess enthalpies of some 2-alkanone + 1-chloroalkane binary mixtures at 25 and 35°C (1991)
    Springer
    Journal of solution chemistry 20 (1991), S. 115-124 
    Details
    ISSN: 1572-8927
    Keywords: Excess molar enthalpies ; UNIFAC model ; 2-butanone ; 2-pentanone ; 1-chloroalkanes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Excess molar enthalpies hE at 25 and 35° C and atmospheric pressure, are reported for the binary mixtures formed by a 2-butanone and 2-pentanone with 1-chlorobutane, 1-chloropentane, 1-chlorohexane, or 1-chlorooctane. The hE values for all the mixtures are positive, increasing as the 1-chloroalkane length increases and as the ketone length decreases. Excess molar enthalpies depend slightly on the temperature. The experimental values together with those from the literature were used to calculate the interaction parameters for the Dang-Tassios version of the UNIFAC model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00651644
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  • 3
    Electronic Resource
    Electronic Resource
    Electron microscopy characterization of ferrisilicates synthesized with two different silicon sources (1992)
    Springer
    Catalysis letters 15 (1992), S. 169-178 
    Details
    ISSN: 1572-879X
    Keywords: Ferrisilicate ; synthesis ; silicon sources ; characterization
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Ferrisilicates have been synthesized by isomorphous substitution of Al by Fe using two silicon sources, to determine the influence of the silicon nature. The X-ray results are similar to that of ZSM-5 zeolite, but SEM and TEM show that the samples are different.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00770909
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  • 4
    Electronic Resource
    Electronic Resource
    Excess Molar Volumes of Ternary Mixtures of 2-Butanone or 2-Pentanone with 1-Chloroctane + n-Octane at 25°C (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 1139-1148 
    Details
    ISSN: 1572-8927
    Keywords: Ternary mixtures ; binary mixtures ; excess volumes ; 2-butanone ; 2-pentanone ; 1-chlorooctane ; octane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Excess molar volumes at 25°C of the ternary systems 2-butanone + 1 -chlorooctane + octane and 2-pentanone + 1-chlorooctane + octane and of binary mixtures 2-butanone + octane, 2-pentanone + octane, and 1-chlorooctane + octane, were determined using an Anton Paar DMA 60/602 densimeter. All the experimental values were compared with the results obtained by empirical expressions for estimating ternary properties from binary data. Variable degree polynomials were fitted to the results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022614101952
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  • 5
    Electronic Resource
    Electronic Resource
    Viscosities and Densities for the 1-Propanol + n-Heptane System at Several Temperatures (1998)
    Springer
    Journal of solution chemistry 27 (1998), S. 569-579 
    Details
    ISSN: 1572-8927
    Keywords: Densities ; viscosities ; excess molar volumes ; 1-propanol ; n-heptane
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Viscosities and densities have been measured for 1-propanol + n-heptane at 20, 25, 30, and 35°C and atmospheric pressure. Kinematic viscosities were determined using a capillary viscosimeter; densities were measured using vibrating-tube densimetry. The viscosity deviations were evaluated. Viscosity results were fitted to the equations of Grunberg–Nissan, McAllister, Auslander, and Teja. The experimental excess molar volumes were compared with the results obtained with the Nitta–Chao model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1022686707250
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  • 6
    Electronic Resource
    Electronic Resource
    MrK86: A 'Not-So-Dark' Galaxy (1998)
    Springer
    Astrophysics and space science 263 (1998), S. 151-154 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have studied the velocity field of the Blue Compact Dwarf galaxy Mrk86 using an Hα Fabry-Perot image and 14 long-slit optical spectra. From the ionized gas velocities measured we have found that Mrk86 follows a solid-body rotation law with a central angular velocity of 34 ± 5 km s-1 kpc-1. The comparison of the modeled rotation curve with our velocity data indicates a clear dominance of the stellar mass component over the dark matter. Related with the galaxy most intense star forming knot, a very strong gradient steeping is observed. Finally, we give kinematic evidence for the Mrk86-C expanding bubble.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002185522181
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  • 7
    Electronic Resource
    Electronic Resource
    NIR Properties of the UCM Star-Forming Galaxies (1998)
    Springer
    Astrophysics and space science 263 (1998), S. 147-150 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We have obtained near-infrared (JK) imaging for 67 star-forming galaxies from the Universidad Complutense de Madrid survey. Aperture photometry at one and three disk-scale lengths have been performed on the J, K and r-band images. By comparing the r - J, J - K colors and equivalent widths of Hα with evolutionary synthesis models we derive the mass of newly formed stars, which is typically a 1 per cent of the galaxy stellar mass. The galaxy stellar masses obtained range between 3×109 and 3×1011 M⊙. The distribution of burst strengths and specific star formation rates indicate a low level of star formation activity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1002133505342
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  • 8
    Electronic Resource
    Electronic Resource
    The Schunck class of all “G-perfect groups” (1993)
    Springer
    Archiv der Mathematik 60 (1993), S. 407-413 
    Details
    ISSN: 1420-8938
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01202303
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  • 9
    Electronic Resource
    Electronic Resource
    Microbial plankton across Drake Passage (1996)
    Springer
    Polar biology 16 (1996), S. 613-622 
    Details
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract  We determined biomass and activity of microbial plankton across the Polar Front (PF) in Drake Passage during January 1994. Temperature was around 0°C south and between 3 and 5°C north of the PF. Both biomass and activities of microorganisms were significantly lower in the Antarctic waters south of the PF than in the sub-Antarctic waters north of it. Thus, values of chlorophyll a, integrated between 0 and 200 m, reached 150 mg m-2 north, but only 25 mg m-2 south of the PF. Likewise, bacteria varied between 1014 and 4×1013 cells m-2. However, the abundance of heterotrophic nanoflagellates was extremely low throughout Drake Passage (around 3×1010 cells m-2). Bacterial doubling times were long (mean of 25 days). Bacterivory was estimated from the abundance of predators and prey and from temperature. The grazing impact on bacterioplankton biomass was insignificant (less that 0.05% per day) and low on bacterial heterotrophic production (15% per day). Neither biomass nor the activities of microorganisms were found to increase at the PF. The microbial food web was uncoupled and the bacteria did not seem to be controlled by predation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s003000050096
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  • 10
    Electronic Resource
    Electronic Resource
    A calibration model to overcome non-spectral interferences in flame atomic absorption spectrometry (1996)
    Springer
    Microchimica acta 124 (1996), S. 1-12 
    Details
    ISSN: 1436-5073
    Keywords: FAAS ; calibration ; standard addition ; matrix effects ; Fe determination
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract A calibration model has been developed in order to overcome matrix effects in atomic absorption measurements. The model uses two independent variables for analyte quantification (the amount of the sample and the amount of analyte added). The dependent variable is the absorbance measured. The method also allows matrix interferences to be controlled without prior knowledge of matrix composition. The method is applied to iron determination by FAAS in the presence of large amounts of copper. Direct calibration and standard addition are also performed in order to compare them with the new empirical model. Results show that the error in iron determination could be −42% when direct calibration is applied and +10% when the standard addition method is used, whereas the proposed model decreases the error to −20%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01244951
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