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  • 1
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    German Medical Science GMS Publishing House; Düsseldorf
    In:  Learning through Inquiry in Higher Education: Current Research and Future Challenges (INHERE 2018); 20180308-20180309; München; DOC21 /20180301/
    Publication Date: 2018-03-02
    Keywords: ddc: 610
    Language: English
    Type: conferenceObject
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical prospecting 16 (1968), S. 0 
    ISSN: 1365-2478
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Physics
    Notes: The widespread use of common depth point techniques has emphasized the need for accurate static corrections. Manual interpretation methods can give excellent results, but a computer technique is desirable because of the great volumn of data recorded in common depth point shooting. The redundancy inherent in common depth point data may be used to compute a statistical estimate of the static corrections. The corrections are assumed to be time-invarient, surface-consistent, and independent of frequency. Surface consistency implies that all traces from a particular shot will receive the same shot static correction and all traces from a particular receiver position will receive the same receiver correction.Time shifts are computed for all input traces using crosscorrelation functions between common depth point traces. The time shift for each trace is composed of a shot static, a receiver static, residual normal moveout if present, and noise. Estimates of the shot and receiver static corrections are obtained by averaging different sets of the measured time shifts. Time shifts which are greatly in error are detected and removed from the computations.The method is useful for data which has a moderate to good signal to noise ratio. Residual normal moveout should be corrected before estimating the statics. The program estimates the statics for correctly stacking common depth point traces but it is not sensitive to constant or very slowly changing static errors.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-3916
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Probestäbe aus PMMA wurden in einer speziellen Versuchsapparatur einer Dauerbiegebeanspruchung ausgesetzt. Die Belastung war eine Schwellbeanspruchung mit einer Frequenz von l,5 Hz. Es wurden so viele Versuchsstücke bis zum Bruch belastet, daß eine Wöhlerkurve und damit die Schwellfestigkeit ermittelt wurden konnte. Der Schwellfestigkeitsbereich war bereits nach kurzer Zeit erreicht und betrug 33% der statischen Festigkeit.
    Notes: Summary The fatigue response of PMMA-specimen was tested under cyclic bending of 1.5 Hz in a particularly designed testing device. Specimen were tested that a “Wöhler” curve and the corresponding fatigue strength could be evaluated. The fatigue strength was reached after a comparatively short time and ranged in the order of 33 per cent of static breaking strength.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Springer
    The European physical journal 61 (1985), S. 483-491 
    ISSN: 1434-6036
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We briefly review undulators and wigglers (u/w) as radiation sources. We restrict our attention to transverse alternating polarity devices to be used in low energy storage rings, particularly to the case of the 0.8 GeV electron storage ring BESSY in Berlin. We discuss the spectral properties of u/w radiation and some aspects of magnet technology relevant to the construction of such devices. Finally we comment on the application of novel devices offering variable polarization.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In actual performance, the 35 pole wiggler/undulator (W/U) at BESSY has been shown to deliver 50 to 250 times more flux than a TGM with 10 mrad of dipole radiation under otherwise comparable conditions. The beamline, laid out for photon energies from 15 to 400 eV, has been calibrated and the resolution measured at several energies. Interactions of the W/U with the storage ring have been studied and, in part, corrected for: the working point does not change in either direction (〈10%) as the gap is varied and the electron beam position in the ring remains constant to within 10 μm and the angle of emission of the SR from the ring to within 5 μrad for K≤2.7. The reduction of the lifetime of the electron beam in the ring and the change in the vertical size of the beam as a function of the gap are typical of the problems associated with the interaction of such a device on a high brightness ring. The beamline has been in normal user operation for over a year.
    Type of Medium: Electronic Resource
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  • 6
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The construction of the wiggler W2 at DORIS is described together with the major components of the beamline. Details are given on the assembly and performance of the magnet structure. Three different monochromators are used in the beamline alternatively. One of them, a Laue–Bragg-type monochromator is described in more detail.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recently there has been some concern about possible radiation damage due to ionizing particles present in high energy storage rings such as multi-GeV electrons, fast neutrons, or hard photons. Partial demagnetization has been observed on undulators after mis-steering of the injected electron beam. Our interest was focused to possible radiation damage of a permanent magnet insertion device during routine operation of a storage ring. Therefore, we repeated the magnetic measurements on one of the three 4.0 m long x-ray wigglers used at place #2 in DORIS III. This device is in operation since 1991. The results were compared to the data taken before installation. The total dose was determined from measurements with thermoluminescence dosimeters and the known number of stored ampere hours. The results which show no significant degradation of the magnetic performance are presented and discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 1432-0878
    Keywords: Mechanoreceptors ; Projections ; CNS ; Locusts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Campaniform sensilla (CS) of the locust proximal leg segments are arranged predominantly as homologous groups on the trochantera and femora. Their number is reduced in the more specialized jumping legs. The specific projections of the primary afferent axons from single groups of CS are visualized after backfilling them with CoCl2 introduced through the dendritic area in the cuticle. The majority of central branching patterns reveal a high degree of uniformity if compared within a population, between populations of one segment, and between populations of different legs. All projections bifurcate close to the peripheral root of the leg nerve and are restricted to the ipsilateral hemiganglion of the segments. These projections seem to differ in their extent more or less from those of campaniform sensilla in other parts of the locust and in other insects.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Recently, a major reconstruction of the electron storage ring DORIS II, the DORIS III project, has been completed [W. Brefeld, H. Nesemann, and J. Rossbach, Proceedings of the European Particle Accelerator Conference, Rome (World Scientific, Singapore, 1988), p. 2389]. Figure 1 shows an overview of the new ring. Originally DORIS II had a twofold symmetry. In part C each of the two dipole magnets adjacing to the 65-m-long straight section was replaced by three corresponding weaker ones. In this way a total of seven straight sections for insertion devices are provided. Six of them are 4-m long and the one in the center is only 2.7-m long. After extensive discussions with the user groups involved, four x-ray wigglers, one asymmetric hybrid structure, one x-ray undulator, and one XUV multiple undulator of the revolver type have been proposed for six of the sections [J. Pflüger and P. Gurtler, Nucl. Instrum. Methods A 287, 628 (1990)]. One section is presently still free. All devices are either in construction or have already been completed and installed. In this contribution the mechanical and magnetic design of these devices will be described. Results of magnetic measurements of those devices which are already completed will be given in more detail.
    Type of Medium: Electronic Resource
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