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  • 1
    Electronic Resource
    Electronic Resource
    SCIPION, a new flexible ionospheric sounder in Senegal (1998)
    Springer
    Annales geophysicae 16 (1998), S. 738-742 
    Details
    ISSN: 0992-7689
    Keywords: Ionosphere (Equatorial ionosphere, Instruments and Techniques) ; Radio science (ionospheric propagation)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract SCIPION is a new state of the art digital sounder that has been developed by France Telecom-CNET for ionospheric monitoring and research. Extensive data processing using DSP technology has resulted in a low power, low cost and full featured system for both vertical and oblique soundings. A SCIPION system is in the process of being installed in Dakar, Senegal, to study HF propagation in the sub-equatorial ionosphere. However, preliminary results have still been obtained during experiments wit a prototype system. In this paper, the system is described and some illustrative examples of its capabilities are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-0738-x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Decameter mid-latitude sporadic-E irregularities in relation with gravity waves (1997)
    Springer
    Annales geophysicae 15 (1997), S. 925-934 
    Details
    ISSN: 0992-7689
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract HF radar observations of mid-latitude sporadic-E irregularities carried out with the Valensole radar in South France are compared with simultaneous ionosonde measurements underneath the irregularity zones. In a previous study of Valensole radar data, it has been shown that HF backscatter from the night-time mid-latitude E region is usually associated with largescale wave-like modulations. To obtain more information on the geophysical conditions prevailing during backscatter events, a new experiment was performed which also included a vertical ionosonde beneath the scattering region. The data to be presented here are from two periods when radar scattering appeared simultaneously with large variations in the virtual height and the Doppler velocity of F-layer reflected echoes measured with the vertical ionosonde, indicating very clearly the passage of atmospheric gravity waves (AGWs). The effect of the atmospheric waves on the sporadic-E layer is not always as marked as it is in the F region. In the first event, the passage of the AGWs is accompanied by an upward followed by a downward movement of the Es-layer. The apparent descending movement of the Es-layer from 135 to 110km in less than 10 min corresponded to a positive (downward) Doppler velocity of 35 m/s measured by the vertical ionosonde, and was accompanied by a range variation in the radar scattering region with a negative rate of about 90–110 m/s. In the second event, the Es-layer is not as strongly disturbed as in the previous one, but, nevertheless, the range variations of the scattering region can still be associated with height fluctuations of the Es-layer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-997-0925-1
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Laparoscopic anatomical hepatic resection (1998)
    Springer
    Surgical endoscopy and other interventional techniques 12 (1998), S. 76-78 
    Details
    ISSN: 1432-2218
    Keywords: Key words: Laparoscopy — Hepatectomy — Lobectomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract. Four patients underwent a laparoscopic left hepatic resection for solid tumor, two for metastasis from colonic cancer, and two for focal nodular hyperplasia (final diagnosis). The procedure was performed according to the rules of conventional hepatic surgery and cancer surgery. No blood transfusion was necessary. No surgical complication occurred. In malignant disease, laparoscopy allows a good staging and the performance of a real no-touch technique; the specimen is removed in a plastic bag without contact to the abdominal wall. In symptomatic benign disease the esthetic benefit of the laparoscopic approach is real. In asymptomatic benign disease, laparoscopy could allow large biopsies in the case of uncertain diagnosis or dangerous resection. It allows safe resections in the case of small, well-located tumors. This approach requires sophisticated material and extensive experience in both laparoscopy and hepatobiliary surgery.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004649900599
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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