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  • 1
    Electronic Resource
    Electronic Resource
    Ultrafast broadband frequency modulation of a continuous wave reflectometry system to measure density profiles on ASDEX Upgrade (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 4138-4145 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A reflectometry system has been developed for ASDEX Upgrade to measure the plasma profile from the scrape-off layer until the bulk plasma, simultaneously at the high and low field sides. Unique features of the system are the ultrafast broadband frequency modulation of a continuous wave using solid state stable hyper abrupt tuned oscillators (down to 10 μs), high and low field side channels and fully remote control operation, via optical fiber links. Due to the special design of the transmission line, with decoupled in going and out going lines and one-antenna configuration, the system is optimized for reception and spurious reflections are eliminated. The ultrafast operation guarantees that the effect of plasma turbulence is greatly reduced. Both features determine the high performance of the diagnostic. A dedicated data acquisition system handles the large amounts of data generated by the broadband operation. Recent developments include the operation of new channels and an automatic and accurate frequency calibration circuit. Also, advanced digital signal processing techniques were applied to obtain density profiles with high spatial and temporal (20 μs) resolutions under turbulent plasma regions, e.g., the scrape-off layer. Experimental results are presented showing the great sensitivity of the diagnostic to plasma radial movements and its tolerance to vertical movements of the plasma. Density profiles measured in ELMy regimes illustrate the capabilities of the diagnostic to detect fast profile changes. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147517
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  • 2
    Electronic Resource
    Electronic Resource
    Akutes Nierenversagen — Klinik und Morphologie (1988)
    Springer
    Journal of molecular medicine 66 (1988), S. 808-816 
    Details
    ISSN: 1432-1440
    Keywords: Acute renal failure ; Glomerulonephritis ; Hemolyticuremic syndrome ; Acute interstitial nephritis ; Rapidly progressive glomerulonephritis ; Akutes Nierenversagen ; Glomerulonephritis ; hämolytisch-urämisches Syndrom ; akute interstitielle Nephritis ; rapid-progressive Glomerulonephritis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Es wird über die pathologisch-anatomischen Diagnosen berichtet, die bei 180 Fällen von klinisch diagnostiziertem ANV erhoben wurden. Im einzelen wird dabei gezeigt, daß in 43,3% der Fälle klinische und pathologische Diagnosen übereinstimmen. In 56,7% der Fälle wurden pathologisch-anatomisch von der Klinik abweichende Diagnosen gestellt. Besonders häufig verbarg sich hinter einem ANV eine GN, darunter vorwiegend eine RPGN, ferner eine akute interstitielle Nephritis oder ein HUS. Darüber hinaus werden die klinischen Diagnosen bei pathologisch-anatomisch diagnostiziertem ANV aufgezeigt. Schließlich wird über die klinischen Diagnosen bei pathologisch-anatomischer Diagnose GN + ANV berichtet. Es wird dabei darauf hingewiesen, daß der Pathologe in der Lage ist, GN mit echter kompensierter Retention von einer GN mit passagerem, eine kompensierte Retention vortäuschendem ANV zu unterscheiden.
    Notes: Summary This study reports the pathological-anatomical diagnoses in 180 cases in which a diagnosis of acute renal failure (ARF) had been made on clinical grounds. The clinical and pathological diagnoses were in agreement in 43.3% of the cases. In 56.7%, the pathological-anatomical diagnosis differed from the clinical diagnosis. Glomerulonephritis (GN) was particularly often concealed behind ARF, in particular rapidly progressive GN, but also acute interstitial nephritis or hemolyticuremic syndrome. In addition, the clinical diagnoses in cases with a pathological-anatomical diagnosis of ARF are presented. Finally, the clinical diagnoses made in cases with a pathological-anatomical diagnosis of GN with ARF are reported. It is thus shown that the pathologist is in a position to distinguish GN with true compensated retention from GN with transient ARF simulating compensated retention.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01728941
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of the neutron electric form factor from the reaction 3 He(e,e'n) at medium momentum transfer (1999)
    Springer
    The European physical journal 6 (1999), S. 329-344 
    Details
    ISSN: 1434-601X
    Keywords: PACS: 14.20.Dh Properties of specific particles: Protons and neutrons – 24.70.+s Nuclear reactions: Polarization phenomena in reactions – 13.40.Gp Specific reactions and phenomenology: Electromagnetic form factors – 25.10.+s Nuclear reactions involving few–nucleon systems – 25.30.Fj Nuclear reactions: Inelastic electron scattering to continuum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract: The electric form factor of the neutron GEn has been determined in double polarized exclusive 3 He(e,e'n) scattering in quasi–elastic kinematics by measuring asymmetries A ⊥, A ∥ of the cross section with respect to helicity reversal of the electron, with the nuclear spin being oriented perpendicular to the momentum transfer q in case of A⊥ and parallel in case of A∥. The experiment was performed at the 855 MeV c. w. microtron MAMI at Mainz. The degree of polarization of the electron beam and of the gaseous 3 He target were each about 50%. Scattered electrons and neutrons were detected in coincidence by detector arrays covering large solid angles. Quasi–elastic scattering events were reconstructed from the measured electron scattering angles ϑe, φe and the neutron momentum vector p n ′ in the plane wave impulse approximation. We obtain the result 〈G En〉(0.27 〈 Q2c2/GeV2 〈 0.5)= 0.0334 ± 0.0033stat± 0.0028syst which is averaged over the indicated range of Q 2, the squared momentum transfer. This G En value is significantly smaller than measured from the D(e,e'n) reaction under similar kinematical conditions. To what extent final state interactions in 3He quench the G En result is subject of calculations currently in progress elsewhere.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s100500050351
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