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  • Articles: DFG German National Licenses  (3)
  • 1990-1994  (3)
  • 33.40. Hp  (1)
  • 72.40  (1)
  • results  (1)
Source
  • Articles: DFG German National Licenses  (3)
Material
Years
  • 1990-1994  (3)
Year
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Applied physics 59 (1994), S. 579-582 
    ISSN: 1432-0630
    Keywords: 42.65 ; 42.70 ; 72.40
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract Two-beam coupling gain and speed of a Cr-doped strontium-barium niobate single crystal at 514.5 nm and 632.8 nm are measured to compare photorefractive origins and responses. The same single deep center and single carriers are found to be responsible for the observed photorefractivities at both wavelengths. Self-pumped phase-conjugate reflectivities are also measured at both wavelengths.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 0942-0940
    Keywords: Ischaemic cerebrovascular disease ; unruptured intraeranial aneurysm ; surgical indications ; results ; subarachnoid haemorrhage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Out of 3435 patients with ischaemic cerebrovascular disease 2540 cases were investigated using cerebral angiography. In 127 of them (5%) aneurysms were found, but without clinical evidence of subarachnoid haemorrhage (SAH). 45 cases were operated upon and 82 were treated conservatively. Five of these 82 cases (6%) suffered from SAH 3 months to 10 years (mean interval 5,6 years) after the angiographic diagnosis. Four of these 5 patients with SAH died. Among the 45 surgical cases follow-up was uneventful in 29 (64%). The other 16 cases postoperatively showed neurological deterioration (36%), which was transient in 6 but with only minor improvement in 10. Of these 10 cases 2 died from cerebral infarction related to intra-operative temporary vascular occlusion respectively myocardial infarction. Thus surgical mortality was 4% and permanent morbidity 18%. Causes of postoperative neurological deterioration were partly related to general arteriosclerotic changes and special fragility of the ischaemic brain, and partly to operative technique (excessive brain retraction, damage to cortical veins, occlusion of major vessels or damage to perforators, temporary artery occlusion). Apparently in cases with ischaemic cerebrovascular diseases operative procedures, which in other cases as a rule are well tolerated, may produce harmful effects. Therefore, in these cases, the indication for operative treatment of so far silent aneurysms should be restricted to patients who are in good general condition with longer life expectancy as far as the vascular disease is concerned, and without major neurological deficit. Furthermore, the operative technique should be especially gentle and atraumatic.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1434-6079
    Keywords: 36.40 ; 33.40. Hp ; 32.30. Bv
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Microwave spectroscopy in highly excited Rydberg states is proposed for structure determination of small metal cluster ions. An experimental setup for microwave optical triple resonance is developed and tested for Yb atom. Many microwave transitions are measured with the line width less than 1 MHz (HWHM).
    Type of Medium: Electronic Resource
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