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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
    Magnetic field dependence of the elastic constants in Nd3Se4(abstract) (1988)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 63 (1988), S. 3933-3933 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Most of the metallic rare-earth chalcogenides of RE3X4 type, where X stands for S, Se, Te, show marked elastic anomalies which appear either in conjunction with a structural transformation or with a magnetic ordering transition. In this contribution we report on results obtained from Nd3Se4 where the elastic constants display a particular magnetic field dependence. Single crystals were grown by a Bridgman–Stockbarger method and the three cubic elastic constants were measured by ultrasonic techniques as function of temperature and in an external magnetic field. The occurrence of magnetic ordering was proved independently by susceptibility measurements. Nd3Se4 has been found to order ferromagnetically at Tc =52 K. In the absence of an external magnetic field approaching Tc from above, the shear elastic constants (C11−C12)/2 softens by about 40%. Below Tc the elastic constants harden again where the increment of C11 follows the Brillouin function of the magnetization. An external magnetic field parallel to the propagation direction of the sound waves affects the elastic anomalies in the paramagnetic as well as in the ferromagnetic phase. Above Tc the sound velocities exhibit a H2 field dependence, as is expected from a magnetoelastic coupling mechanism. At temperatures smaller Tc the field-dependent elastic anomalies are related to the hysteresis loop M(H). The change of the elastic constants as a function of the magnetic field is proportional to the field derivative dM/dH. The coupling coefficient has an opposite sign for the C44 and (C11−C12)/2 shear elastic constants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.340610
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Modification to the HP 4274/75A LCR meters for investigation of device admittance under heavy forward bias conditions (1985)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 56 (1985), S. 1265-1268 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The HP 4274A and HP 4275A LCR meters are widely used in the fields of semiconductor device characterization and component test. A bias voltage can be applied to the test samples either from an external power supply or from the built-in HP-IB controllable voltage source. The total series resistance of the bias filtering circuit should be in the range of about 100 Ω (HP 4275A). Detailed measurements and checking the measuring circuit diagrams revealed that the effective series resistance can be much higher, depending on the measuring range of the bridge. Therefore, admittance measurements on low-ohmic samples, especially Schottky or pn junctions under heavy forward bias conditions, are seriously affected by bias voltage reduction between the front HI/LOW terminals. Thus, e.g., a reduced apparent capacitance is measured. Consequently, the doping concentration near the pn junction will be determined erroneously. To avoid these effects, a bias regulating circuit is inserted into the LCR meters to guarantee the feedthrough of the bias voltage without any attenuation. Examples of admittance vs frequency and doping profiles near the pn junction of quaternary (Ga0.046In0.954As0.1P0.9) diodes are given for explanation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1137989
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    Paper (German National Licenses)
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  • 4
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    Unknown
    Heim, Albert. Luft-Farben (Book Review) (1913)
    Wiesbaden : Periodicals Archive Online (PAO)
    Geographische Zeitschrift. 19:4 (1913:Apr. 17) 228 
    Details
    ISSN: 0016-7479
    Topics: Geography
    Notes: Bücherbesprechungen
    URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pao:&rft_dat=xri:pao:article:h092-1913-019-04-000021
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  • 5
    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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  • 6
    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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  • 7
    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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  • 8
    Electronic Resource
    Electronic Resource
    Kolorimetrische Bestimmung von Phenolen in Abwassern (1911)
    Springer
    Fresenius' Zeitschrift für analytische Chemie 50 (1911), S. 736-740 
    Details
    ISSN: 1618-2650
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01476323
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