منابع مشابه
An anatomical explanation of the formation of butterfly shadows.
Butterfly or batswing shadows are perihilar opacities of a particular shape. They were observed by early authors in cases of pulmonary oedema (Day, Sisson, and Vogt, 1929; Coe and Otell, 1932; Roubier and Plauchu, 1933). Later details of the radiological appearances are described, variations noted, and several explanations of the pathogenesis suggested (Zdansky, 1933; Roubier and Plauchu, 1934;...
متن کاملShadows.
We investigate the brightness distribution in and around outdoor shadows (for a variety of sky conditions) using modeling and field measurements. The dominant factor influencing the brightness of a shadow is the solid angle subtended by the object blocking the Sun. Occulters at the zenith that subtend a small solid angle cast shadows that are bright and possess a nearly uniform brightness acros...
متن کاملShadows.
It is almost 160 years since Dr James McDonnell delivered an address to the students entering the Belfast General Hospital. Since that time it has fallen upon a member of this staff to welcome those students who have commenced their first year in the clinical branches of medicine. This year it is my privilege and honour to address and welcome you on behalf of the medical and dental staff of thi...
متن کاملInduction The dance of shadows
Statistics stems out from induction. Induction is a long lasting notion in philosophy. The nature of notions in philosophy are such that neither they can be solved completely nor one can leave them forever. One of the most important problem in induction is “the problem of induction”. In this paper we give a short history of induction and discuss some aspects of the problem of induction.
متن کاملRemoving shadows
Shadows often confound algorithms designed to solve computer vision tasks such as image segmentation, object detection and tracking. In this paper, a shadow detection and removal technique is proposed. The method requires no camera calibration or other a priori information regarding the scene. Support vector machines are used to identify shadow boundaries based on their boundary properties. Thi...
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ژورنال
عنوان ژورنال: Nature
سال: 1899
ISSN: 0028-0836,1476-4687
DOI: 10.1038/061128a0