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  • 1
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    MedFlux: Investigations of particle flux in the Twilight Zone. (2009)
    In:  EPIC3Deep-Sea Research II, 56., 1363
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 2
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    Coagulation efficiency of phytoplankton cells during different growth stages and its relationship to exopolymer particle properties (2007)
    In:  EPIC3ASLO Aquatic Science Meeting, Santa Fe, NM, USA.
    Details
    Publication Date: 2019-07-17
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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  • 3
    Electronic Resource
    Electronic Resource
    Dynamics of vibrationally excited ozone formed by three-body recombination. I. Spectroscopy (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5202-5208 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spectrally resolved infrared fluorescence near 10 μm from vibrationally excited O3(ν3) has been observed in a cryogenic reactor facility at low pressure. The excited O3(v) is formed principally by three-body recombination of O and O2 in flowing, microwave-discharged O2/Ar mixtures at 1 Torr and 80 K. The spectral resolution is sufficient to permit identification and assignment of band centers for up to five quanta of stretching excitation. The observed transition frequencies are consistent with those predicted from a Darling–Dennison perturbation treatment. The spectra, which sample the recombination/deactivation sequence in its early to middle stages, indicate surprisingly little intermode coupling, being predominantly ν3 in character. There is also evidence of O3(v) excitation by near-resonant V–V coupling between O3 and O2(v=2). The spectroscopic analysis of the data is described, and considerations for scaling the spontaneous transition probabilities with vibrational level are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453688
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  • 4
    Electronic Resource
    Electronic Resource
    Dynamics of vibrationally excited ozone formed by three-body recombination. II. Kinetics and mechanism (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 5209-5221 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spectrally resolved infrared chemiluminescence from vibrationally excited ozone, O3(v), has been used to study the reaction kinetics of O3(v) in discharged O2/Ar mixtures at ∼1 Torr and 80–150 K. Dependences of the excited state number densities on temperature and O2 mole fraction indicate O3(v) is formed primarily by three-body recombination of O with O2 and is destroyed by rapid chemical reaction with O. Several secondary excitation reactions involving vibrationally and electronically excited O2 are also indicated. The data are treated with a detailed steady-state analysis of the discharge kinetics, to extract estimates for rate coefficients of the key elementary reactions. The effective "quasinascent'' state distribution in recombination is also inferred; this distribution shows selective recombination into the asymmetric stretching mode, but an apparently statistical (i.e., collisionally scrambled) behavior among the vibrational states within that mode. The results are discussed in terms of the detailed dynamics of three-body recombination.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453689
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  • 5
    Electronic Resource
    Electronic Resource
    Infrared spectra (2–16 μm) of ArI Rydberg emission from a microwave discharge plasma (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 681-692 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Infrared (2–16 μm) emission from Ar Rydberg atoms, excited in a conventional low-pressure microwave discharge plasma, has been observed in the cryogenic COCHISE reactor/spectrometer facility. The observed spectrum is very complex but is identifiable using the detailed energy level structure and optical selection rules for ArI. Detailed transition probabilities for dipole-allowed transitions between 2 and 16 μm were computed using the Coulomb approximation. Comparisons of observed and predicted spectra show that substantial long wavelength infrared (LWIR) emission (∼12 μm) arises from Rydberg states near the ionization limit; these states must have kinetically enhanced populations in order to account for the observed emission intensities. The results are interpreted in terms of a radiative/collisional cascade sequence initiated by dissociative recombination of Ar+2 with energetic electrons in the active discharge.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448545
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  • 6
    Electronic Resource
    Electronic Resource
    Characterisation of Aeromonas strains and species by pulsed field gel electrophoresis and principal components analysis (1999)
    Oxford, UK : Blackwell Science Ltd
    Journal of fish diseases 22 (1999), S. 0 
    Details
    ISSN: 1365-2761
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology , Medicine
    Notes: Aeromonas genomes were investigated by restriction digesting chromosomal DNA with the endonuclease XbaI, separation of restriction fragments by pulsed field gel electrophoresis (PFGE) and principal components analysis (PCA) of resulting separation patterns. A. salmonicida salmonicida were unique amongst the isolates investigated. Separation profiles of these isolates were similar and all characterised by a distinct absence of bands in the 250kb region. Principal components analysis represented these strains as a clearly defined homogeneous group separated by insignificant Euclidian distances. However, A. salmonicida achromogenes isolates in common with those of A. hydrophila and A. sobria were shown by principal components analysis to be more heterogeneous in nature. Fragments from these isolates were more uniform in size distribution but as demonstrated by the Euclidian distances attained through PCA potentially characteristic of each strain. Furthermore passaging of Aeromonas isolates through an appropriate host did not greatly modify fragment separation profiles, indicative of the genomic stability of test aeromonads and the potential of restriction digesting/PFGE/PCA in Aeromonas typing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2761.1999.00186.x
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  • 7
    Electronic Resource
    Electronic Resource
    A STUDY OF PHYSICAL ADSORPTION AT VERY LOW PRESSURES USING ULTRAHIGH VACUUM TECHNIQUES (1963)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 67 (1963), S. 2000-2007 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100804a012
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  • 8
    Electronic Resource
    Electronic Resource
    An electrostatic analyzer for surface structure measurements by low-energy-ion-scattering (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3273-3279 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A cylindrical electrode electrostatic analyzer has been designed for surface structure measurements which has sufficient sensitivity that shadowing/blocking data can be obtained without significantly damaging the surface structure. A modification to the standard π/(square root of)2 design compensates for that part of the spread in the ion energies due to elastic scattering kinematics. The analyzer is small enough to fit inside a standard 25 cm diameter UHV chamber on a turntable, allowing angular distribution measurements over a wide range of scattering angles. An example of a shadowing/blocking angular scan of a clean Si(100) surface is shown. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145493
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  • 9
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    Constraining the timing of deformation in the southwestern Central Zone of the Damara Belt, Namibia (2011)
    In:  Geological Society Special Publication 357: 107-135.
    Details
    Publication Date: 2011-10-13
    Description: Structural investigations and U–Pb sensitive high-resolution ion microprobe (SHRIMP) dating of rocks from the southwestern Central Zone of the Damara Belt, Namibia, reveal that a major SE-verging deformation event (D2) occurred at between 520 and 508 Ma. During D2, SE-verging simple shear and NE–SW pure shear extension in a constrictional stress field produced recumbent, south- to SE-verging, kilometre-scale folds and ductile shear zones, a NE–SW extensional lineation and conjugate shear bands, and was coeval with granitoid emplacement and high-grade metamorphism. The timing of this event is constrained by anatectic leucosomes in D2 shear zones (511±18 Ma) and extensional shear bands (508.4±8.7 Ma) as well as by syntectonic grey granites (520.4±4.2 Ma), and is similar to ages for high-grade metamorphism in the Central Zone. An upright folding event (D3) occurred at c. 508 Ma, resulting in the formation of basement-cored fold interference domes. The timing of deformation and metamorphism at 520–508 Ma in the mid-crustal SW Central Zone contrasts with ages of 560–540 Ma for shallow crustal NW-verging folding and thrusting elsewhere in the Central Zone that was concomitant with voluminous magmatism. This magmatism led to metamorphism and anatexis of the basement and the emplacement of anatectic red granites at 539±17 to 535.6±7.2 Ma, which contain 1013±21 Ma inherited zircons. The Central Zone therefore contains a record of crustal thickening, heating of the mid-crust, exhumation and orogen-parallel extension over the life of an orogen.
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  • 10
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    Terrane correlation between Antarctica, Mozambique and Sri Lanka; comparisons of geochronology, lithology, structure and metamorphism and possible implications for the geology of southern Africa and Antarctica (2008)
    In:  Geological Society Special Publication 308: 91-119.
    Details
    Publication Date: 2008-11-24
    Description: Analysis of new lithological, structural, metamorphic and geochronological data from extensive mapping in Mozambique permits recognition of two distinct crustal blocks separated by the Lurio Belt shear zone. Extrapolation of the Mozambique data to adjacent areas in Sri Lanka and Dronning Maud Land, Antarctica permits the recognition of similar crustal blocks and allows the interpretation that the various blocks in Mozambique, Sri Lanka and Antarctica were once part of a mega-nappe, forming part of northern Gondwana, which was thrust-faulted c. 600 km over southern Gondwana during amalgamation of Gondwana at c. 590-550 Ma. The data suggest a deeper level of erosion in southern Africa compared with Antarctica. It is possible that this thrust domain extends, through the Zambezi Belt or Valley, as far west as the Damara Orogen in Namibia with the Naukluft nappes in Namibia, the Makuti Group, the Masoso Suite in the Rushinga area and the Urungwe klippen in northern Zimbabwe, fitting the mega-nappe pattern. Erosional products of the mountain belt are now represented by 700-400 Ma age detrital zircons present in the various sandstone formations of the Transantarctic Mountains, their correlatives in Australia, as well as the Urfjell Group (western Dronning Maud Land) and probably the Natal Group in South Africa.
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