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  • 1
    Electronic Resource
    Electronic Resource
    Spontaneous dissecting aneurysm of the extracranial vertebral artery (20 cases) (1985)
    Springer
    Neuroradiology 27 (1985), S. 327-333 
    Details
    ISSN: 1432-1920
    Keywords: Spontaneous dissecting aneurysm ; vertebro-basilar stroke ; vertebral artery ; vertebro basilar system ; cerebral angiography ; fibromuscular displasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Spontaneous dissecting aneurysm of the vertebral artery is an infrequent cause of vertebro basilar ischemic strokes. Previously reported cases concern essentially occlusion of the basilar artery. Only 14 cases of spontaneous dissecting aneurysm concern the extracranial vertebral artery among these eight were angiographically documented. In this study based upon 15 patients (20 dissecting aneurysms), the authors discuss etiological factors, such as hypertension or fibromuscular dysplasia: on clinical findings they insist upon the diagnostic value of preliminary symptoms, cervical pain or posterior headaches; the most frequent angiographic appearance was a long and irregular stenosis of one or two segments of the vertebral artery. The prognosis of these aneurysms most often appears favourable in this group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00339566
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Cerebral angiography in ischemic strokes (1985)
    Springer
    Neuroradiology 27 (1985), S. 521-538 
    Details
    ISSN: 1432-1920
    Keywords: Cerebral angiography ; Cerebral infarcts ; Cerebral ischaemia ; Transient monocular blindless ; Transient ischemic attacks ; Stroke ; Atherosclerosis ; Dolichomegavessels ; Aneurysms ; Dissecting aneurysms ; Arteritis ; Fibromuscular hyperplasia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Summary Angiography remains a very important means of evaluation of ischemic strokes: it confirms the diagnosis showing the occluded artery. It eventually shows the anastomotic pathways for cerebral circulation and it often finds the causes of stroke, among which the most frequent are atherosclerosis (70%) and fibromuscular hyperplasia (10%). The safer way to perform angiography is the retrograde route. Indications for angiography must be discussed according to the type of stroke, its onset, and the arterial territory involved.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00340848
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Preliminary results from the MEMO multicomponent measurements of waves on-board INTERBALL 2 (1998)
    Springer
    Annales geophysicae 16 (1998), S. 1117-1136 
    Details
    ISSN: 0992-7689
    Keywords: Magnetospheric physics (auroral phenomena; plasma waves and instabilities; instruments and techniques)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The MEMO (MEsure Multicomposante des Ondes) experiment is a part of theINTERBALL 2 wave consortium. It is connected to a total of six electric and nine magnetic independent sensors. It provides waveforms associated with the measurement of two to five components in three frequency bands: ELF (5–1000 Hz), VLF (1–20 kHz), LF (20–250 kHz). Preliminary analyses of low and high resolution data are presented. The emphasis is put on the estimation of the propagation characteristics of the observed waves. VLF hiss emissions are shown to be mainly whistler mode emissions, but other modes are present. An accurate estimation of the local plasma frequency is proposed when the low L = 0 cutoff frequency is identified. AKR emissions observed just above source regions are studied. R-X and L-O modes are found: the first at the lowest frequencies and the second at the highest. Both propagate with wave normal directions weakly oblique or quasi-parallel to the Earth’s magnetic field direction. Propagation characteristics are also determined for a (non-drifting) fine structure of AKR. There is no fundamental difference with structurless events. Night-side and dayside bursts of ELF electromagnetic emissions are presented. It is not clear whether the two emissions belong to the “lion roar” emissions or not.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s00585-998-1117-3
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    The Cluster Spatio-Temporal Analysis of Field Fluctuations (STAFF) Experiment (1997)
    Springer
    Space science reviews 79 (1997), S. 107-136 
    Details
    ISSN: 1572-9672
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Spatio-Temporal Analysis of Field Fluctuations (STAFF) experiment is one of five experiments which together comprise the Wave Experiment Consortium (WEC). STAFF consists of a three-axis search coil magnetometer to measure magnetic fluctuations at frequencies up to 4 kHz, and a spectrum analyser to calculate in near-real time aboard the spacecraft, the complete auto- and cross-spectral matrices using the three magnetic and two electric components of the electromagnetic field. The magnetic waveform at frequencies below either 10 Hz or 180 Hz is also transmitted. The sensitivity of the search coil is adapted to the phenomena theo be studied: the values 3 × 10-3 nT Hz-1/2 and 3 × 10-5 nT Hz-1/2 are achieved respectively at 1 Hz and 100 Hz. The dynamic range of the STAFF instruments is about 96 dB in both waveform and spectral power, so as to allow the study of waves near plasma boundaries. Scientific objectives of the STAFF investigations, particularly those requiring four point measurements, are discussed. Methods by which the wave data will be characterised are described with emphasis on those specific to four-point measurements, including the use of the Field Energy Distribution function.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1004979209565
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    Paper (German National Licenses)
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