منابع مشابه
Climbing Mount Everest Without Oxygen
The ascent of Mount Everest (altitude 8,848 m) by two climbers without supplementary oxygen in 1978 was a feat that astonished many physiologists; indeed, measurements of maximal oxygen uptake at lower altitudes suggested that it would be impossible. Data obtained in 1981 at extreme altitudes, including the summit itself, showed that man can tolerate the extreme hypoxia only by an enormous incr...
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School of Medicine and Pharmacology, University of Western Australia, Sir Charles Gairdner Hospital, Nedlands, WA. Bruce W S Robinson, MD, FRACP, FRCP, Professor of Medicine. Department of Cardiothoracic Surgery, Royal Perth Hospital, Perth, WA. Mark G Edwards, MB BS, FRACS, FRCS, Cardiothoracic Surgeon. Reprints will not be available from the authors. Correspondence: Professor Bruce W S Robins...
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The Everest climbing season that has just ended was marred by the worst accident in the mountain’s history. On 18 April 2014, 16 Nepalese sherpas died in an avalanche, and subsequent climbing expeditions were cancelled. 2 The deaths of men from poor communities, hired to perform dangerous tasks for the sake of mountain climbing, provoked controversy. I used data on deaths above base camps from ...
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This article distills insights from historical, sociological, and psychological perspectives on marriage to develop the suffocation model of marriage in America. According to this model, contemporary Americans are asking their marriage to help them fulfill different sets of goals than in the past. Whereas they ask their marriage to help them fulfill their physiological and safety needs much les...
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The primary resource for quantum computation is Hilbert-space dimension. Whereas Hilbert space itself is an abstract construction, the number of dimensions available to a system is a physical quantity that requires physical resources. Avoiding a demand for an exponential amount of these resources places a fundamental constraint on the systems that are suitable for scalable quantum computation. ...
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ژورنال
عنوان ژورنال: Nature
سال: 2006
ISSN: 0028-0836,1476-4687
DOI: 10.1038/440870a