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  • 1
    Electronic Resource
    Electronic Resource
    Source and General Properties of Humic Acids from Lignitic Materials. (1959)
    s.l. : American Chemical Society
    Journal of chemical & engineering data 4 (1959), S. 173-176 
    Details
    ISSN: 1520-5134
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/je60002a018
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  • 2
    Electronic Resource
    Electronic Resource
    Infrared Examination of the Carbon-Hydrogen Stretching Frequency in Pyrocatechols, Guaiacols, and Phenols. (1964)
    s.l. : American Chemical Society
    Analytical chemistry 36 (1964), S. 2412-2414 
    Details
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ac60219a010
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  • 3
    Electronic Resource
    Electronic Resource
    Sequences Homologous to the Human X- and Y-Borne Zinc Finger Protein Genes (ZFX/Y) Are Autosomal in Monotreme Mammals
    Amsterdam : Elsevier
    Genomics 15 (1993), S. 317-322 
    Details
    ISSN: 0888-7543
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1006/geno.1993.1063
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  • 4
    Electronic Resource
    Electronic Resource
    Ionization of organic molecules with ultraviolet lasers: A technique for generating large, well-defined ionized volumes (1985)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 57 (1985), S. 1648-1655 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In this paper we report a technique for generating a large, homogeneous volume of ionized gas and for making time-resolved measurements of its electron density. We also report absolute photoionization coefficients for a number of molecules. These coefficients will allow calculation of peak electron densities obtained in other ionization-related experiments. In our technique, the beam from a rare-gas halogen laser photoionizes organic molecules that have been seeded into a buffer gas. Ionization is accomplished by the absorption of two photons. We have analyzed the electron densities produced by photoionization with a microwave interferometer that measures the electron density in the ionized gas with a time-resolution of a few nanoseconds. Some of the organic molecules photoionized in this work produce electron-ion pairs with an efficiency more than five orders of magnitude higher than commonly used laboratory ionization sources such as ArF laser photoionization of NO. We have also studied the effect of attaching gases on the ionized mixtures and have demonstrated that addition of as little as 10 Torr of SF6 can reduce the peak electron density observed by a factor of 103.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.334485
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  • 5
    Electronic Resource
    Electronic Resource
    Hydrogenating Shale Oil to Catalytic Reforming Stock (1957)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 49 (1957), S. 679-684 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50568a031
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  • 6
    Electronic Resource
    Electronic Resource
    Mass balance calculations with end member compositional variability: applications to petrologic problems
    Amsterdam : Elsevier
    Earth and Planetary Science Letters 81 (1987), S. 212-220 
    Details
    ISSN: 0012-821X
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0012-821X(87)90157-9
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  • 7
    Electronic Resource
    Electronic Resource
    Nd evidence for Proterozoic crustal development in the Belt–Purcell Supergroup (1984)
    [s.l.] : Nature Publishing Group
    Nature 312 (1984), S. 53-56 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The Belt-Purcell Supergroup of the northwestern United States and southwestern Canada is the most extensive and least disturbed succession of Proterozoic sediments in North America. It outcrops over an area greater than 125,000km2 in western Montana, northern Idaho, southwestern Alberta and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/312053a0
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  • 8
    Electronic Resource
    Electronic Resource
    U-Pb sphene dating of metamorphism: the importance of sphene growth in the contact aureole of the Red Mountain pluton, Laramie Mountains, Wyoming (1996)
    Springer
    Contributions to mineralogy and petrology 125 (1996), S. 186-199 
    Details
    ISSN: 1432-0967
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The relative importance of thermal diffusion versus new growth or recrystallization on U-Pb isotopic data from sphene is assessed through a study of amphibolites and granite gneisses within the contact aureole of the Red Mountain pluton, Laramie anorthosite complex, Wyoming. Samples were collected along a traverse approximately perpendicular to the margin of the intrusion over a distance of 0.13 to 2.65 km from the contact. The 207Pb/206Pb ages of sphene from amphibolite samples range between 1.43 Ga, the intrusive age of the Red Mountain pluton, to 1.78 Ga, the age of regional metamorphism. The 207Pb/206Pb ages of sphene in rocks metamorphosed above 700° C are within error of the intrusive age of the pluton, and appear to have resulted from diffusional resetting of preexisting sphene and the metamorphic growth of additional sphene at 1.43 Ga. At greater distance from the contact the 207Pb/206Pb ages range from 1.45 to 1.72 Ga. This 300 million year spread in ages is interpreted to result from two periods of sphene growth, one produced during regional metamorphism at 1.78 Ga and another generation of newly grown or recrystallized sphene that formed during contact metamorphism at 1.43 Ga. These two age populations may be identified on the basis of petrographic textures, the morphologies and color differences of grain separates as well as by the U-Pb systematics. In rocks metamorphosed to temperatures less than 700° C, sphene growth was the dominant process controlling the response of the U-Pb isotope system to contact metamorphism. Sphene grew well outside the zone of obvious contact metamorphism. The U-Pb sphene ages were reset by diffusion only at high temperatures, supporting the experimentally determined closure temperature estimates for the U-Pb system in sphene of around 650° C (Cherniak 1993). This study demonstrates that U-Pb ages of sphene can be used to date metamorphism not only in areas with a simple geologic history, such as igneous intrusion or single metamorphic or deformational events, but also to date multiple events so long as different generations of sphene can be identified and separated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004100050215
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  • 9
    Electronic Resource
    Electronic Resource
    Atmospheric boundary-layer measurements of concentration statistics from isolated and multiple sources (1985)
    Springer
    Boundary layer meteorology 31 (1985), S. 249-268 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Atmospheric tracer dispersion experiments have been carried out to measure the statistical characteristics (variance, frequency distribution, spectrum) of the concentration downwind of a pair of partly overlapping plumes. By releasing different tracer substances from each source, it was possible to identify the contributions of the two sources at a given measurement point, both separately and jointly, and thus to compare and interpret the joint statistics in terms of those from the individual sources. Statistics for the individual sources agree well with, and support, existing wind tunnel and theoretical results. Nondimensionalization of the data using the mean concentration and the lateral width of the plume as concentration and length scales successfully removes much of the variation due to changes in atmospheric and surface conditions. Measurements of the correlation between the concentration contributions from separated sources are consistent with recent wind tunnel measurements. Entirely new measurements of the frequency distribution of the combined concentration from a pair of sources show that in many situations, high concentrations relative to the mean occur much less frequently than for an isolated source. Generally the extent of the reduction in frequency of occurrence is inversely related to the degree of correlation between concentrations from the two sources.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00120895
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  • 10
    Electronic Resource
    Electronic Resource
    Browse and Search Patterns in a Digital Image Database (2000)
    Springer
    Information retrieval 1 (2000), S. 287-313 
    Details
    ISSN: 1573-7659
    Keywords: browsing ; digital images ; image retrieval ; user studies
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract A prototype image retrieval system with browse and search capabilities was developed to investigate patterns of searching a collection of digital visual images, as well as factors, such as image size, resolution, and download speed, which affect browsing. The subject populations were art history specialists and non-specialists. Through focus group interviews, a controlled test, post-test interviews and an online survey, data was gathered to compare preferences and actual patterns of use in browsing and searching. While specialists preferred direct search to browsing, and generalists used browsing as their preferred mode, both user groups found each mode to play a role depending on information need, and found value in a system combining both browse and direct search. There were no significant differences in performance among the search modes of browse, search, and combined browse/search models when the quasi-controlled study tested the different modes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1009979200555
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