The optical spectrograph and infrared imager system (OSIRIS) on board the Odin spacecraft is designed to retrieve altitude profiles of terrestrial atmospheric minor species by observing limb-radiance profiles. The grating optical spectrograph (OS) obtains spectra of scattered sunlight over the range 280-800 nm with a spectral resolution of approximately 1 nm. The Odin spacecraft performs a repetitive vertical limb scan to sweep the OS 1 km vertical field of view over selected altitude ranges from approximately 10 to 100 km. The terrestrial absorption features that are superimposed on the scattered solar spectrum are monitored to derive the minor species altitude profiles. The spectrograph also detects the airglow, which can be used to study the mesosphere and lower thermosphere. The other part of OSIRIS is a three-channel infrared imager (IRI) that uses linear array detectors to image the vertical limb radiance over an altitude range of approximately 100 km. The IRI observes both scattered sunlight and the airglow emissions from the oxygen infrared atmospheric band at 1.27 µm and the OH (3-1) Meinel band at 1.53 µm. A tomographic inversion technique is used with a series of these vertical images to derive the two-dimensional distribution of the emissions within the orbit plane.Résumé : Le système de spectrographie optique et d'imagerie infrarouge (OSIRIS) à bord du satellite Odin est conçu pour enregistrer les profils en altitude des éléments mineurs de l'atmosphère en observant les profils de radiance du limbe. Le spectrographe optique à réseau (OS) obtient les spectres de la lumière solaire diffusée sur le domaine entre 280-800 nm, avec une résolution spatiale approximative de 1 nm. Le satellite Odin balaye verticalement le limbe de façon répétée, de telle sorte que l'ouverture verticale de 1 km du OS parcoure les domaines voulus entre 10 et 100 km. Nous analysons les spectres solaires diffusés en superposition avec les caractéristiques terrestres d'absorption, afin de déterminer les profils en altitude des éléments mineurs de l'atmosphère. Le spectrographe détecte aussi la luminescence nocturne atmosphérique qui peut être utilisé pour étudier la mésosphère et la thermosphère. L'autre partie d'OSIRIS est un imageur infrarouge (IRI) à trois canaux qui utilise une banque linéaire de détecteurs pour imager la radiance du limbe sur un domaine d'altitude d'approximativement 100 km. L'IRI observe à la fois la lumière solaire diffusée et les émissions de luminescence nocturne atmospérique provenant de la bande infrarouge de l'oxygène atmosphérique à 1.27 µm et la bande de Meinel de l'OH (3-1) à 1.53 µm. Nous utilisons une technique d'inversion tomographique avec une série de ces images verticales pour obtenir la distribution bidimensionnelle des émissions à l'intérieur de l'orbite.[Traduit par la Rédaction] Can.
Evidence has previously been produced from this laboratory (Barlow and Pocock, 1963;Barlow, 1965) that apical late systolic murmurs denote mitral regurgitation, and that the commonly associated non-ejection systolic clicks also have an intracardiac, and probably chordal, origin. It has also been suggested that the association of these auscultatory features with a distinctive electrocardiographic pattern and a billowing posterior leaflet of the mitral valve constitutes a specific syndrome (Barlow, 1965;Barlow and Bosman, 1966).In this paper we present an analysis of 90 subjects with either a late systolic murmur, a nonejection click, or both. The intracardiac origin of these murmurs and clicks is reaffirmed and their possible mode of production is considered. The abnormal electrocardiogram, the probable structural abnormality of the mitral valve mechanism, the various underlying aetiological factors, and the prognosis are discussed. SUBJECTS AND METHODSOf the 90 subjects, 65 were referred to the Cardiac Clinic for assessment of their auscultatory signs. Seven were found during hospital admission for a non-cardiac illness; 6 were detected after closed mitral valvotomy, and 5 others after other forms of mitral valve surgery. One 30-year-old woman complaining of palpitations, who regularly attended the Clinic, developed a late systolic murmur and click a year after observation began. Examination of relatives of patients with late systolic murmurs or non-ejection clicks produced a further 6 cases.The 90 subjects ranged in age from 4 to 63 years; 45 of them, including 13 children, were under the age of 30;
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