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  • 1995-1999  (45)
  • 1950-1954  (17)
  • 1940-1944  (4)
  • 1935-1939  (18)
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  • 1
    Monograph available for loan
    Monograph available for loan
    Jena : Meteorologisches Institut der Universität Jena
    Call number: MOP S 12619
    Type of Medium: Monograph available for loan
    Location: MOP - must be ordered
    Branch Library: GFZ Library
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  • 2
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 4783-4794 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The superconducting quantum interferometer with two quantization loops, the so-called double SQUID, or D-SQUID, is a modification of the well-known rf SQUID. The modification consists of a replacement of the one junction of the rf SQUID by a superconducting loop with two Josephson junctions. This device can be used to transform the weak magnetic flux applied to the loop with junctions to a voltage across the tank circuit inductively coupled to the other loop. As has previously been shown in experiments [G. S. Krivoy and H. Koch, J. Appl. Phys. 74, 2925 (1993)], D-SQUIDs have an extremely large output signal swing up to 1 mV and a transfer function of several mV/(h/2e). In this paper, a D-SQUID theory using a numerical and an analytical approach is developed. The theoretical results are compared with the above-mentioned experiments. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 81 (1997), S. 2010-2020 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Partly resistive superconducting quantum interference devices (RSQUIDs) are used in noise thermometry in the liquid helium temperature range. Here we analyze one type of RSQUID that has not been thoroughly investigated until now: the direct current biased with two Josephson junctions and a resistive part connected in series with the junctions and closed by a superconducting ring. The resistive shunted model of the Josephson junctions is used for the analysis. Two cases of the RSQUID ring inductance were analyzed: (i) negligibly small and (ii) small but finite inductance. The expressions for the low frequency output signal, the current–voltage (I–V) characteristics, and the current flowing through the resistive part are obtained. In the dependence of the output frequency versus the dc current passed through the resistive part often an offset is observed experimentally. This phenomenon can be explained as an influence of an asymmetry in the critical currents of the junctions. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 77 (1995), S. 4088-4098 
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: A theoretical analysis of the multiloop dc superconducting quantum interference device (SQUID) magnetometer fabricated from low-Tc (transition temperature) or high-Tc materials is presented. Using simple analytic formulas, the essential parameters of a multiloop magnetometer can be estimated: the effective area A, the effective SQUID inductance L, the transfer function VΦ, and the flux density noise (square root of)SB. The theoretical predictions are compared with experimental results of seven different low-Tc versions and good agreement is found. Based on the analytical description, a high-Tc magnetometer design with a 7 mm pickup coil and 16 parallel loops giving a sufficiently small SQUID inductance L(approximately-equal-to)145 pH is presented. At T=77 K a voltage swing 2δV(approximately-equal-to)8 μV and a white noise (square root of)SB(approximately-equal-to)8 fT/(square root of)Hz are predicted assuming a critical current I0=20 μA and a normal resistance R=2 Ω per junction and a damping resistance Rd=R across the SQUID inductance. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1856-1858 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Three magnetometers based on dc superconducting quantum interference devices (SQUIDs) fabricated from YBa2Cu3O7−x have been operated in a magnetically shielded room using a flux-locked loop involving additional positive feedback with bias current reversal. Two of these devices, integrated multiloop dc SQUIDs with outer diameters of 7 mm, achieved white noise levels of 10 fT/(square root of)Hz for bicrystal junctions and 30 fT/(square root of)Hz for step-edge junctions. The third magnetometer involved a flux transformer with a 10×10 mm2 pickup coil connected to a 16-turn input coil which was inductively coupled to a bicrystal SQUID. This device achieved a white noise of 16.2 fT/(square root of)Hz. High quality magnetocardiograms were obtained without signal averaging. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3008-3015 
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A fast SQUID (superconducting quantum interference device) magnetometer system using the latest multiloop magnetometer W7A with additional positive feedback has been built. A 3-dB bandwidth of 5 MHz has been achieved in a simple direct-coupled flux-locked loop. The feedback range is ±620 Φ0 or ±290 nT, the white-noise level 3.4×10−6 Φ0/(square root of)Hz or 1.6 fT/(square root of)Hz, and the 1/ f corner frequency (approximately-equal-to)7 Hz. Above 1 MHz the noise level increases slightly, approximately with (square root of)SΦ ∝f1/6. At high signal frequencies a slew rate of about 8×105 Φ0/s has been measured. Below the pole frequency of the second integrator (480 kHz) the slew rate increases with decreasing frequency, having a maximum of 3×107 Φ0/s at 7.6 kHz. The total harmonic distortion (THD) decreases strongly with the signal amplitude below the slew rate limit. For a sinusoidal signal with half the maximum amplitude, the THD is (approximately-equal-to)4% at 1 MHz, (approximately-equal-to)0.04% at 100 kHz, and (approximately-equal-to)2.7 ppm (1 ppm=10−6) at 10 kHz. Below about 2 kHz the THD becomes almost frequency independent and lies between 0.4 and 7 ppm for signal amplitudes between 2.5 and 620 Φ0. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 66 (1995), S. 1418-1420 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Two integrated, thin-film multiloop magnetometers (fractional turn SQUIDs) have been fabricated using a YBa2Cu3O7−x-SrTiO3-YBa2Cu3O7−x multilayer process. The magnetometers have 16 parallel loops, an outer diameter of 7 mm and effective areas of 1.84 and 1.89 mm2, respectively. The magnetic field noise of the better device, measured in a YBCO tube at 77 K with a bias reversal scheme, was 37 fT Hz−1/2 at 1 Hz and 18 fT Hz−1/2 at 1 kHz. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 68 (1996), S. 1421-1423 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: An integrated dc superconducting quantum interference device (SQUID) magnetometer has been fabricated using a YBa2Cu3O7−x–SrTiO3–YBa2Cu3O7−x multilayer process. The magnetometer consists of a 8.3 mm×8.6 mm pickup coil coupled inductively to a small washer-type SQUID with 9 Ω bicrystal junctions via an integrated 101/2-turn input coil. Using simple direct-coupled read-out electronics with additional positive feedback, a noise level of 9.7 fT/(square root of)Hz at 1 kHz and 53 fT/(square root of)Hz at 1 Hz was measured inside a magnetically shielded room. Due to the low noise level biomagnetic heart and brain signals with high quality and the very weak signals of the peripheral nerve system were recorded. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 890-890 
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Dr. D. W. Ewer and I. Hattingh's findings thus extend rather than contradict my statement of ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Pure and applied geophysics 23 (1952), S. 185-211 
    ISSN: 1420-9136
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Description / Table of Contents: Summary In the year 1943, numerous series of wind-measurements of height were accomplished wich open precise information over the windconditions within and above the air-valve over the sea, its vertical thickness, upper surfaces, beginning and end, a. s. o. The sea-wind is working according to the principle of circulation ofHann and the theory ofDefant 1950. Italian pilot-Balloon ascents, particularly in Vigna di Valle and Lido di Roma, are statical working up to month-and annual-means of the direction and force. It results on the coast in the course of the day a strong, in the inland only a weak turn of the sea-breeze with the height in consequence of the earth-rotation to the right, as an impression up to over 60 in summer, in winter 20 km coastal distance. On the coast the sea-wind reaches its full strength with 1200 to 1500 m first in the afternoon, in the inland already in the fornoon, however it increases not so strong. The speed somewhat augments from the coast to the inland; the raising of the terrain involves an increase of the speed and a rise of the sea-breeze upperfront. For the wintry air-valve is restored a longitudinal section from Lido di Roma over Rom to Monterotondo (45 km).
    Notes: Zusammenfassung Zahlreiche Höhenwind-Serienmessungen aus dem Jahre 1943 sowie die italienischen Terminpiloten in der Umgebung von Rom führen zu einem geschlossenen Bild über den räumlichen sowie tages- und jabreszeitlichen Ablauf der Seewindzirkulation. Bei schwachem oberen Sollwind arbeitet das System nach demHann'schen Schema. Dem oft sehr markanten Einbruch des eigentlichen Seewindes, der sich binnenwärts verzögert, geht am Vormittag nach Beendigung des nächtlichen Landwindes eine Uebergangsphase mit wechselnder, zeitweise schon auf Südwest einpendelnder Richtung voraus. Für die mittlere Richtung, die im Binnenland eine gute Konstanz aufweits, ergibt sich eine lagsame Drehung in der Höhe um 12–15° nach rechts. Das Maximum der Geschwindigkeit findet sich zwischen 100 und 200 m über Grund. Im Winter reicht die Brise bis 20, im Sommer bis über 60 km landein. An der Küste von Lido di Roma dreht der Wind infolge der Rechtsablenkung in den meisten Fällen von Südwest auf Nordwest und steigt erst am Nachmittag mit seiner Obergrenze auf 1200 bis 1500 m oder höher hinauf; dagegen gewinnt der Seewind im Binnenland in kurzer Zeit seine volle, aber nicht so große Höhe. Daher steigt der Seewindkörper am Vormittag von der Küste binnenwärts an, am Nachmittag ist er jedoch am Strand mächtiger, im Winter bleibt er hier flach.
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