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  • 1
    Online Resource
    Online Resource
    Höchstfrequente Empfänger-OEICs auf InP-Basis : Abschlußbericht 1.4.1994 - 31.3.1998 zum Teilvorhaben im Förderschwerpunkt Optische Kommunikationssysteme (Hochbitratenübertragung) (1999)
    Berlin
    Details Availability
    Keywords: Forschungsbericht
    Description / Table of Contents: High-bit rate photoreiceiver, 40 Gbit/s, OEIC, PIC, InP, optical networks, TDM-techniques, SDH, SONET
    Type of Medium: Online Resource
    Pages: 15 p. = 363179 B., text
    Edition: [Electronic ed.]
    URL: https://edocs.tib.eu/files/e001/266923909.pdf
    URL: https://edocs.tib.eu/files/e001/266923909l.pdf
    Language: German , English
    Note: Contract no. BMBF 01 BP 431/7 , Differences between the printed and electronic version of the document are possible
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  • 2
    Electronic Resource
    Electronic Resource
    Post treatment of groundwater denitrification fluidized bed reactor effluents to achieve drinking water quality (1998)
    Springer
    Journal of industrial microbiology and biotechnology 20 (1998), S. 354-359 
    Details
    ISSN: 1476-5535
    Keywords: Keywords: fluidized bed; drinking water; post treatment; dentrification; bacterial regrowth
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Post treatment of effluents from heterotrophic groundwater denitrification fluidized bed reactors (FBR) designed to achieve drinking water quality has been investigated. The denitrification process adds to the dissolved organic compounds, biomass and bacteria in the effluent. They are also lacking dissolved oxygen. Effluents from the process were treated in combined post treatment processes based on either a trickling filter and sedimentation unit (‘TF combination’) or contact flocculation (‘CF combination’). Both processes were followed by sand filtration, granular activated carbon (GAC) and chlorination. Results regarding total suspended solids (TSS) and turbidity removal showed an advantage to the ‘CF combination’, and the target turbidity (NTU 〈1) was always achieved when the alum dose was 10 or 20 mg l−1. Backwash of the sand filter and GAC column was required after 27 h of operation (average value). An average total reduction in dissolved organic carbon (DOC) of 40% was observed with a final DOC of 3.5–4 mg L−1. Most of the removal of the DOC occurred in the sand filter (28%), while the GAC contribution was smaller (18%). No regrowth potential was observed using the Werner method when a pure culture of Pseudomonas fluorescens P17 was used as inoculum in samples of chlorinated effluent (post chlorination). When a mixed culture of indigenous bacteria was used as inoculum, a high regrowth potential was observed. Installing an additional chlorination unit before the sand filter column (pre and post chlorination) resulted in effluent with no regrowth potential for both Pseudomonas fluorescens P17 and indigenous bacteria.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/sj.jim.2900535
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of atomic order on [110] phonon softening [4] and displacive phase transition in Invar alloys (1999)
    Springer
    The European physical journal 10 (1999), S. 641-648 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 63.20.Dj Phonon states and bands, normal modes, and phonon dispersion - 64.70.Kb Solid-solid transitions - 65.40.+g Heat capacities of solids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The acoustic phonon dispersions of two Invar crystals , one ordered with the ( ) structure, the other disordered fcc, have been investigated between 3.4 K and 470 K by inelastic and elastic neutron scattering. For the ordered crystal, pronounced softening of the whole phonon branch is observed on cooling below the Curie temperature. Particularly strong phonon softening at the M-point zone boundary of the structure leads to a displacive, antiferrodistortive phase transition at low temperatures. For the disordered crystal, much weaker softening of the phonons is observed and restricted to the region near the Brillouin zone center, where increasing elastic scattering with decreasing temperature indicates the growth of local tetragonal strain. This strain is considered as a typical precursor of the transformation to bct martensite. Specific heat measurements, performed at low temperatures on both crystals confirm the neutron scattering results and reveal considerable enhancement of the low energy phonon density of states in the ordered crystal.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050896
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  • 4
    Electronic Resource
    Electronic Resource
    Zur Bewertung ätiologischer Faktoren der Beckenendlage (1959)
    Springer
    Archives of gynecology and obstetrics 191 (1959), S. 586-601 
    Details
    ISSN: 1432-0711
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Zusammenfassung Unter 12377 Geburten der Jahre 1951–1957 fanden sich 582 (4,65%) BEL, die die Grundlage der Untersuchungen über die möglichen Entstehungsursachen der BEL bildeten. Diese Gesamtzahl wurde aber nur für die Untersuchungen im Hinblick auf Frühgeburten und Mehrlinge verwendet. Für die übrigen möglichen ätiologischen Faktoren wurden alle Kinder unter 2500 g und alle Mehrlingsgeburten ausgesondert, so daß von nunmehr 11187 Geburten 337 (3,01%) BEL die Grundlage der Untersuchungen bildeten. An Hand der eigenen Geburten wurden die sog. klassischen und nichtklassischen ätiologischen Faktoren geprüft, wobei unsere Ergebnisse die geltenden Anschauungen in vielen Punkten bestätigten, in einigen ihnen jedoch widersprachen. Im ganzen gesehen war zu erkennen, daß eine gesicherte Ursache für die Entstehung der BEL nur in den wenigsten Fällen gefunden werden konnte. Bei Einschluß der sog. zweifelhaften Ursachen ergab sich eine Häufigkeit von rund 17%.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00668817
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  • 5
    Electronic Resource
    Electronic Resource
    phonon dispersion and martensitic phase transition in ordered alloys (1999)
    Springer
    The European physical journal 11 (1999), S. 75-81 
    Details
    ISSN: 1434-6036
    Keywords: PACS. 63.20.Dj Phonon states and bands, normal modes, and phonon dispersion - 81.30.Kf Martensitic transformations - 61.12.-q Neutron diffraction and scattering
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: In a previous neutron scattering study, we had observed that the TA phonon softening in L12-ordered ferromagnetic Fe72Pt28 Invar is pronounced at the zone boundary M-point and leads to an antiferrodistortive phase transition at low temperatures. Here, we report on similar neutron scattering investigations on two ordered crystals with higher Fe content to investigate the relation between the TA phonon softening and the martensitic transformation, which occurs in Fe-rich ordered Fe-Pt. We find that the TA phonon softening, especially at the M-point zone boundary, does not depend on the composition of the investigated crystals. In Fe74.5Pt25.5, however, the antiferrodistortive phase transition temperature is enhanced due to tetragonal strain preceding the martensitic transition. In Fe77Pt23 a precursor driven premartensitic phase transition is not observed. The structure of the martensite is, however, influenced by the soft mode lattice instability of the austenite. This would explain the origin of structural details found previously for Fe3Pt thermoelastic martensite.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100510050918
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