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  • 1
    Digitale Medien
    Digitale Medien
    Amsterdam : Elsevier
    Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Section 42 (1986), S. 721-723 
    ISSN: 0584-8539
    Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Thema: Chemie und Pharmazie , Physik
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    ISSN: 1572-9672
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Observations of the solar spectrum have been made between 1200–2200 Å with high spectral resolution. The results were obtained with an all-reflecting echelle spectrograph carried by a stabilized Skylark rocket launched in April 1970. Measurements of the profiles of a number of emission lines due to Siii, Cii, Siiii and Civ formed in the temperature range 104-105 K, indicate ion energies which are considerably in excess of the electron temperatures derived from the ionization balance. Since the ion/electron relaxation time is very short the observed ion energies cannot correspond to an ion temperature and hence a non-thermal mechanical energy component exists in the transition zone. It is postulated that the non-thermal energy component represents the actual mechanical energy responsible for the heating of the corona, and, that, it is propagated as an acoustic wave. On this basis and with a preliminary estimate of the reflection from the transition zone, a flux of 3 × 105 erg cm -2 s -1 is established as entering the corona. This value is in agreement with estimates of the total energy loss from the corona due to conduction, radiation and the solar wind, thus establishing a gross energy balance. Theoretical calculations are currently underway to establish the physical nature of the atmosphere which would result from such a propagating flux. At the present time this has been carried out for an atmosphere in hydrostatic equilibrium and the energy balance equation solved. A preliminary temperature structure which results is shown in Figure 1, together with the derived distribution in electron density. This gives a corona of the right temperature and density but the observed structure deviates in detail from those derived from an analysis of the solar XUV spectrum.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Springer
    Solar physics 17 (1971), S. 333-354 
    ISSN: 1573-093X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract An echelle grating spectrograph has been flown in Skylark sounding rockets to investigate the solar ultraviolet spectrum. The instrument can record a range of ∼ 1000 Å, within the limits λ1000 Å-λ3000 Å, with a spectral resolving power of 105, and its use in the range λ1200–λ2200 Å is described. Values are quoted for the spectral efficiency of the individual optical components, and for the complete instrument over a wide wavelength range, and a description is given of the method used to estimate and then to discriminate against the in-flight stray light when the solar disc is imaged onto the entrance slit. The mechanical arrangement of the components is described and some of the problems associated with the alignment and operation are discussed.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    ISSN: 1434-9949
    Schlagwort(e): Lymphoma ; Hypercalcemia ; 1,25-Dihydroxyvitamin D
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary We report two patients with non-Hodgkin's lymphoma in whom hypercalcemia and elevated 1,25 dihydroxyvitamin D (1,25-(OH)2D3) levels developed in the absence of any lytic bone lesions. Hypercalcemia responded only transiently to glucocorticoids which were ill tolerated. Intravenous APD administration was needed to circumvene hypercalcemia. Humoral hypercalcemia of malignancy is discussed. Our cases confirm that hypercalcemia associated with elevated 1,25-(OH)2D3 may occur in malignant lymphoma.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 5
    ISSN: 1434-9949
    Schlagwort(e): Giant Cell Arteritis ; Large Vessel Vasculitis ; Temporal Arteritis
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Diffuse arterial involvement in giant cell arteritis (GCA) is well recognized. By contrast, GCA clinically isolated to large vessels without cephalic, rheumatologic or systemic symptoms represents a much rarer manifestation of the disease. We report the cases of 4 elderly women presenting with a diffuse and symptomatic occlusive disease without the typical signs of temporal arteritis, in whom biological, angiographic or pathological findings were suggestive of GCA. Medium to high dose oral corticosteroids were given to the 4 patients, in combination with various revascularization procedures, allowing a fair clinical response. Large vessel arteritis should be considered in elderly women with diffuse non-atherosclerotic occlusive disease and elevated erythrocyte sedimentation rate, even if typical features of GCA are lacking. In those cases, a long-term treatment with corticosteroids is mandatory, but surgical or angioplastic revascularization is often required.
    Materialart: Digitale Medien
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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