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  • 1995-1999  (28)
  • 1925-1929
  • 1998  (12)
  • 1995  (16)
  • 1
    Electronic Resource
    Electronic Resource
    Development of a high current H− source for European spallation source : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1012-1014 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: For the European spallation source, a volume source based on the high efficiency source is being developed. The source will be optimized to produce high current densities in pulsed operation. A pulse generator delivering 1–1.5 ms pulses was installed. Furthermore, cesium was supplied to the plasma generator from an external oven. The cesium injection was optimized for a low e/H− ratio and a high current. We obtained a current density of 70 mA/cm2. This way, with an aperture radius of 4.25 mm, an H− current of 40 mA was extracted at an extraction voltage of 22 kV. After a description of the source and the experimental setup, measurements of the beam current density and the e/H− ratio will be presented in this article. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148547
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  • 2
    Electronic Resource
    Electronic Resource
    Development of a Bi+ source for heavy ion fusion : Proceedings of the 7th international conference on ion sources (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1066-1068 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A volume source based on the high efficiency source is being developed for heavy ion production. Bismuth was chosen for exemplifying investigations because of its low melting point. The ion source is driven by an arc discharge ionizing bismuth atoms which are evaporated from an oven inside the source chamber. It has been optimized to produce a beam with a fraction of singly ionized bismuth above 92%. A multiaperture extraction system was built consisting of seven holes with a radius of 3 mm each. For that system, the perveance limit was achieved at a beam current of 70 mA and an extraction voltage of 27.5 kV. The corresponding emission current density amounts to 35 mA/cm2. This value was obtained for an arc power of only 280 W. Furthermore, the emittance of a beam extracted from the multiaperture extraction system has been determined with a high power emittance scanner. It amounts to 0.27π mm mrad (80%, normalized, 4 rms). In this case, the emittance of a single beam is 0.017π mm mrad. This article will give a detailed description of both the source and the experimental setup. In addition, various dependencies between the plasma parameters and the beam composition are presented. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148634
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Evidence for normal and inhomogeneous lowermost mantle and core-mantle boundary structure under the Arctic and northern Canada (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Geophysical journal international 122 (1995), S. 0 
    Details
    ISSN: 1365-246X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Seismic P waves from a total of about 200 nuclear explosions in the USA, the former USSR and China, observed at 10 arrays and four networks in Europe, Canada and the USA, are used to analyse the structure at the base of the mantle and the core-mantle boundary (CMB).The simple waveforms and well-controlled source parameters of nuclear explosions allow one to use the events as source arrays in addition to the usual receiver array configuration. A new array technique (double beamforming; Krüger et al. 1993) integrating both concepts is applied, which increases the slowness resolution considerably.A total of 56 source-receiver combinations (i.e. reflection points in the lower mantle or on the CMB) could be analysed. In five regions, anomalous arrivals (PdP) with slowness and arrival times between those of P and PcP are observed. One of these five areas (Svalbard region) shows short-period PcP/P amplitude ratios, which are about three times higher than those predicted by standard earth models. In the Severnaya Zemlya region, where PdP and PcP precursors were observed previously (Krüger et al. 1993), PcP shows azimuth deviations of up to 10°. For some other regions, deviations of the PcP waveform from the direct P waveform are also observed.These anomalous phases and the PcP waveform distortions cannot be explained with standard 1-D earth models. They are probably produced by inhomogeneities in the lowermost mantle. The observed variations in the waveforms are strong indications of a laterally heterogeneous structure in two depth ranges. The first is the CMB and its immediate vicinity of a few tens of kilometres; the second region is the depth range between about 200 and 300 km above the CMB. Maps of the North Pole region, giving the distributions of inhomogeneities in the lower mantle and on the CMB, are presented. These maps show evidence of strong heterogeneity of the D″ boundary layer and possibly also of the CMB in the same area.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-246X.1995.tb07017.x
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  • 4
    Electronic Resource
    Electronic Resource
    Acyclovir-resistant chronic cutaneous herpes simplex in Wiskott-Aldrich syndrome (1995)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 133 (1995), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A 28-year-old man with Wiskott—Aldrich syndrome presonied with ulcerative-proliferative lesions on his face from which herpes simplex type 1 (HSV-1) was isolated. He was initially treated with 10 mg/kg of acyclovir (Zovirax®) intravenously every 8h, but his skin lesions worsened. Clinical resistance to acyclovir was suspected, and therapy with this drug was intensified. The dosage of acyclovir was increased to 45 mg/kg, administered by continuous infusion, and the lesions subsequently resolved. The strain of HSV recovered from the patient showed acyclovir-resistance in vitro, using the colorimetric method with neutral red.Herpes simplex virus resistance to acyclovir is rare. It is more common in immunocompromised patients if subtherapeutic doses are administered in the treatment of chronic persistent forms of infection. Whenever clinical resistance to acyclovir is suspected, the dosage should be increased to 2 mg/kg per h administered via an infusion pump. If no improvement is observed in the patient's condition with this regimen, a phosphorylated medication whose mechanism of action is not dependent on viral thymidine kinase, such as foscarnet (phosphonoformic acid), should be substituted.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1995.tb02682.x
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  • 5
    Electronic Resource
    Electronic Resource
    (−)-Tetrahydropalmatine Monohydrate (1998)
    Oxford [u.a.] : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 1977-1980 
    Details
    ISSN: 1600-5759
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108270198009676
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  • 6
    Electronic Resource
    Electronic Resource
    Structure of the Tannin Geraniin Based on Conventional X-ray Data at 295 K and on Synchrotron Data at 293 and 120 K (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Acta crystallographica 54 (1998), S. 687-694 
    Details
    ISSN: 1600-5740
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Chemistry and Pharmacology , Geosciences , Physics
    Notes: Geraniin, C41H28O27.7H2O, is the main tannin from Geranium thunbergii Sieb. et Zucc., which is one of the most popular folk medicines and also an official antidiarrheic drug in Japan. Conventional X-ray diffractometer data at 295 K and synchrotron data at 293 and 120 K (at EMBL/DESY Hamburg with a MARRESEARCH imaging plate) were measured. The structure could not be determined with any of the currently distributed direct-methods programs, but was easily solved with DIRDIF using several conformers of the hexahydroxydiphenoyl group as input fragments into a vector-search procedure. A molecular structure was established where a cyclohexenetrione moiety attached to O4 of a central glucose unit was in a hydrated six-membered hemiacetal ring structure, as expected from the NMR study of crystalline geraniin. Owing to the high oligocyclic substitution the glucopyranosyl ring is in the unusual 1C4 conformation. Refinement of the low-temperature synchrotron data allowed identification of almost all the H atoms, even within the seven water molecules, so that a rather complex system of approximately 30 different hydrogen bonds can be studied in some detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0108768198000081
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  • 7
    Electronic Resource
    Electronic Resource
    Theories for multiple resonances (1995)
    Springer
    The European physical journal 351 (1995), S. 391-396 
    Details
    ISSN: 1434-601X
    Keywords: 21.60.Jz ; 21.60.Ev ; 03.65.Sq
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Two microscope theories for multiple resonances in nuclei are compared, n-particle-hole RPA and quantized Time-Dependent Hartree-Fock (TDHF). The Lipkin-Meshkov-Glick model is used as test case. We find that quantized TDHF is superior in many respects, except for very small systems.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01291144
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  • 8
    Electronic Resource
    Electronic Resource
    Total charge-changing cross sections for neutron-deficient isotopes from58Ni fragmentation (1995)
    Springer
    The European physical journal 352 (1995), S. 69-75 
    Details
    ISSN: 1434-601X
    Keywords: 21.10.Ft ; 25.70.Np ; 27.40.+Z
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract At the projectile-fragment separator FRS of GSI, relativistic secondary beams of about 520 MeV/nucleon were produced by fragmentation of a primary beam of58Ni at 650 MeV/nucleon in a beryllium target. By means of aΔE—Bρ—TOF measurement, the fragments have been identified and their charge-changing probabilities in targets of CH2, C, Al, and Pb have been determined. We describe the results for the total charge-changing cross sections in this first paper, whereas a second article deals with the partial charge-changing cross sections. At the drip line, the measured charge-changing cross sections exhaust close to 100% of the total interaction cross sections as calculated with semiempirical models. The measurements at the proton drip line with low-Z targets indicate that only a very small increase of the cross sections may be observed, whereas the measurements with a lead target show that no significant increase of the total charge-changing cross sections is present which would be a hint for low-lying dipole strength. Our experimental data are compared to Glauber-type calculations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01292761
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  • 9
    Electronic Resource
    Electronic Resource
    Minimal Surfaces of Least Total Curvature and Moduli Spaces of Plane Polygonal Arcs (1998)
    Springer
    Geometric and functional analysis 8 (1998), S. 1129-1170 
    Details
    ISSN: 1420-8970
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s000390050125
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  • 10
    Electronic Resource
    Electronic Resource
    Die versorgungsrechtliche Beurteilung einer Posttraumatischen Belastungsstörung (1998)
    Springer
    Der Nervenarzt 69 (1998), S. 811-814 
    Details
    ISSN: 1433-0407
    Keywords: Schlüsselwörter Posttraumatische Belastungsstörung ; Sozialmedizinische Begutachtung ; Suizidunfall ; Key words Posttraumatic stress disorder ; Social medicine expert opinion ; Railway suicide accidentDas Konzept der Posttraumatischen Belastungsstörung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Summary The concept of a posttraumatic stress disorder (PTSD) has become important for psychiatric diagnosis and research, particularly following US-american studies on Vietnam war veterans. Recently, studies on traindrivers involved in suicide accidents have shown symptoms of anxiety and depression in more than 30% of concerned drivers and typical symptoms of a PTSD in 15%. Here, we present the case of a traindriver who was involved in 6 suicide accidents within 17 years of traindriving (the average is 2 suicide accidents). Following the 3rd accident, the driver developed increasingly symptoms like anxiety, sleep disturbances, flashbacks and irritability. Following the 6th accident, he has been unable to work. A former expert opinion saw no relationship between the symptoms of the driver and the suicide accidents. Therefore, further information about the concept of a PTSD seems necessary to ensure early psychotherapeutic and pharmacological treatment of patients with such a disorder.
    Notes: Zusammenfassung Das Konzept der Posttraumatischen Belastungsstörung (PTSD) erlangte v.a. durch US-amerikanische Studien an Vietnamkriegsveteranen Bedeutung für die psychiatrische Diagnostik und Forschung. Neuere Studien an Zugführern, die in Suizidunfälle verwickelt waren, zeigten ängstlich-depressive Symptome bei mehr als 30% und typische Symptome einer posttraumatischen Belastungsstörung bei 15% der Betroffenen. Wir präsentieren die Kasuistik eines Lokomotivführers, der im Rahmen seiner Tätigkeit 6 Suizidunfälle innerhalb von 17 Jahren miterlebt hatte. Der Durchschnitt liegt bei 2 Suizidunfällen. Mit dem 3. Unfall entwickelte der Proband zunehmende Ängstlichkeit, Schlafstörungen, Flashbacks und Reizbarkeit. Seit dem 6. Unfall ist er arbeitsunfähig. In einer früheren gutachterlichen Stellungnahme wurde kein Zusammenhang zwischen den Symptomen des Probanden und den Suizidunfällen gesehen. Daher scheint eine weitere Aufklärung über das Krankheitsbild einer PTSD notwendig, um eine frühzeitige psychotherapeutische und pharmakologische Behandlung von Patienten mit einer solchen Erkrankung sicherzustellen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001150050347
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