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  • 1
    Online Resource
    Online Resource
    Fortschritte der Chemie Organischer Naturstoffe / Progress in the Chemistry of Organic Natural Products. (1978)
    Vienna :Springer Wien,
    Details
    Keywords: Chemistry, Organic-Periodicals. ; Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (597 pages)
    Edition: 1st ed.
    ISBN: 9783709185056
    Series Statement: Fortschritte der Chemie Organischer Naturstoffe Progress in the Chemistry of Organic Natural Products Series ; v.35
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6555366
    Language: English
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    GEOMAR EBL
  • 2
    Online Resource
    Online Resource
    Fracture of Non-Metallic Materials : Proceeding of the 5th Advanced Seminar on Fracture Mechanics, Joint Research Centre, Ispra, Italy, 14-18 October 1985 on Collaboration with the European Group on Fracture. (1986)
    Dordrecht :Springer Netherlands,
    Details
    Keywords: Fracture mechanics-Congresses. ; Electronic books.
    Description / Table of Contents: Proceedings of the 5th Advanced Seminar on Fracture Mechanics Joint Research Centre, Ispra, Italy, October 14-18, 1985.
    Type of Medium: Online Resource
    Pages: 1 online resource (401 pages)
    Edition: 1st ed.
    ISBN: 9789400947849
    Series Statement: Ispra Courses Series
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6557172
    DDC: 620.1/126
    Language: English
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  • 3
    Online Resource
    Online Resource
    Obst, Gemüse, Kartoffeln, Pilze : 2. Teil. (1968)
    Berlin, Heidelberg :Springer Berlin / Heidelberg,
    Details
    Keywords: Electronic books.
    Type of Medium: Online Resource
    Pages: 1 online resource (631 pages)
    Edition: 1st ed.
    ISBN: 9783642876806
    Series Statement: Handbuch der Lebensmittelchemie Series ; v.5 / 2
    URL: https://ebookcentral.proquest.com/lib/geomar/detail.action?docID=6591537
    Language: German
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  • 4
    Electronic Resource
    Electronic Resource
    Correlation of YBa2Cu3O7 step-edge junction characteristics with microstructure (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 1131-1139 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Current-voltage characteristics, Josephson radiation spectra, and critical current versus magnetic-field dependences were measured in epitaxial, c-axis YBa2Cu3O7 step-edge Josephson junctions (SEJs) on SrTiO3 and LaAlO3 substrates with various step angles α. The results were correlated with microstructural data to determine the origin of the observed weak-link behavior. It was shown that on steps with α(approximately-greater-than)45° the SEJ is a series connection of two weak links unambiguously correlated with the occurrence of two 90° tilt grain boundaries. On steep steps, α≥70°, the boundary at the upper step edge has, on average, the (103) symmetry, while the lower one is predominantly of the basal-plane-faced (010)(001) type. Correspondingly, one link is weaker than the other, with the weaker link originating on the (010)(001) boundary. However, others have shown that analogous grain boundaries in planar (103) and biepitaxial a-axis/c-axis films do not exhibit a strong magnetic-field dependence of critical current, which is characteristic of a weak link. Hence, it is proposed that the weak-link behavior of boundaries on step edges originates from their defect structure. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.360347
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  • 5
    Electronic Resource
    Electronic Resource
    A new model for the absorption coefficient of narrow-gap (Hg,Cd)Te that simultaneously considers band tails and band filling (1993)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 73 (1993), S. 3486-3492 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A semiempirical model is presented that correlates the broadening of the absorption edge with both transitions below the energy gap and with transitions by the Kane band model. This model correctly fits both the absorption and luminescence spectra of narrow-gap (Hg,Cd)Te samples that have been grown by the traveling heater method as well as by molecular-beam epitaxy. The accuracy of the band-gap determination is enhanced by this model.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.352954
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Some band structure related optical and photoelectrical properties of Pb1−xEuxSe (0≤x≤0.2) (1992)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 72 (1992), S. 1399-1404 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The results of an experimental study of photoelectrical and optical properties of molecular beam epitaxy grown Pb1−xEuxSe are presented. The data obtained are discussed with respect to band structure of the mixed crystal obtained by a linear interpolation between the relevant energy states in the binaries PbSe and EuSe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.351752
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  • 7
    Electronic Resource
    Electronic Resource
    A miniaturized scanning tunneling microscope with large operation range (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 692-693 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A small sized (〈1 cm3) and low mass (2.5 g) scanning tunneling microscope (STM) with automatized large range tip approach is introduced. By concentric arrangement of two piezotubes a temperature drift compensation is realized. Using a simple likewise concentric glass tube inside the inner piezotube as a frictional wire holder, an unlimited longitudinal adjustment range by stepwise inertial translation could be obtained. High mechanical resonance frequencies due to the low mass as well as the mechanical independency of the environment by purely electronic control reduce remarkably the effort for mechanical damping and make the system fast and particularly suited for special applications such as low temperature STM. Sample change and restoration of the tip position require only a few seconds.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144199
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  • 8
    Electronic Resource
    Electronic Resource
    Electron-beam damaged high-temperature superconductor Josephson junctions (1997)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 82 (1997), S. 5612-5632 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Results are presented on the fabrication and characterization of high critical temperature Josephson junctions in thin films of YBa2Cu3O7−δ produced by the process of focused electron-beam irradiation using 350 keV electrons. The junctions so produced have uniform spatial current densities, can be described in terms of the resistive shunted junction model, and their current densities can be tailored for a given operating temperature. The physical properties of the damaged barrier can be described as a superconducting material of either reduced or zero critical temperature (Tc), which has a length of ∼15 nm. The Tc reduction is caused primarily by oxygen Frenkel defects in the Cu–O planes. The large beam currents used in the fabrication of the junctions mean that the extent of the barrier is limited by the incident electron-beam diameter, rather than by scattering within the film. The properties of the barrier can be calculated using a superconductor/normal/superconductor (SNS) junction model with no boundary resistance. From the SNS model, we can predict the scaling of the critical current–resistance (IcRn) product and gain insight into the factors controlling the junction properties, Tc, and reproducibility. From the measured IcRn scaling data, we can predict the IcRn product of a junction at a given operating temperature with a given current density. IcRn products of ∼2 mV can be achieved at 4.2 K. The reproducibility of several junctions in a number of samples can be characterized by the ratio of the maximum-to-minimum critical currents on the same substrate of less than 1.4. Stability over several months has been demonstrated at room and refrigerator temperatures (297 and 281 K) for junctions that have been initially over damaged and then annealed at temperatures ∼380 K. Junctions manufactured using conventional lithography (0.5 μm wide) and which are suitable for digital electronics (Ic=500 μA at 40 K) can achieve IcRn products of 650 μV at 40 K. The production of 100 of these stabilized junctions could be accomplished in ∼4 h of irradiation time. The IcRn scaling also indicates that junctions suitable for high sensitivity superconducting quantum interference devices (Ic∼100 μA) can be made with IcRn products of ∼120 μV at 77 K. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.366422
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  • 9
    Electronic Resource
    Electronic Resource
    Fabrication and characterization of YBa2Cu3O7 step-edge junction arrays (1993)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 62 (1993), S. 2280-2282 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We investigated one-dimensional arrays with up to 600 step-edge Josephson junctions (SEJ) fabricated by pulsed laser deposition of YBa2Cu3O7 (YBCO) films on steep steps in epitaxial LaAlO3 substrates. The steps were prepared by Ar-ion milling and the YBCO thin films were patterned either by Ar-ion milling or by an inhibit process. The current-voltage (I-V) characteristics and the Josephson emission of a single SEJ show that it consists of two resistively shunted-junction-type (RSJ) weak links in series which have different critical currents, IC1 and IC2. The I-V characteristics of our arrays were also close to the RSJ-model. The number of series-connected weak links deduced from the I-V curves was usually higher than the number of steps. Histograms of the individual weak link ICs showed two peaks at IC1 and IC2. The IC spread was about ±20% to ±40% of these two values. Radiation from arrays was detected and an evidence of phase locking in Josephson junction clusters obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.109395
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  • 10
    Electronic Resource
    Electronic Resource
    Low-noise YBa2Cu3O7 rf SQUID magnetometer (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 645-647 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A superconducting quantum interferometer device (SQUID) electronics with tank frequencies near 150 MHz was constructed to enhance the rf SQUID sensitivity. By these means we characterized our YBa2Cu3O7 thin-film rf SQUIDs with step-edge junctions immersed in liquid N2. We obtained transfer function values of over 40 μV/Φ0, at a 50 Ω input impedance, for both hysteretic and dispersive mode of rf SQUID operation. The rms white and 1/f flux noise levels were significantly lower than at the tank frequency of 20 MHz. The best magnetic field sensitivity at 77 K was 0.9 pT/Hz1/2, and the energy resolution 1.4×10−28 J/Hz, down to 0.3 Hz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.106580
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