منابع مشابه
Varying Mechanical Loads
or intact muscle. End-systolic pressure-volume relations of frog hearts have been found to be load dependent, whereas those of the mammal are relatively load independent. On the other hand, myocardial relaxation as studied at the muscle level is load independent in the frog but markedly load dependent in the mammal. Interpretation of these studies is complicated because of the unknown contribut...
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During human walking, the center of pressure under the foot progresses forward smoothly during each step, creating a wheel-like motion between the leg and the ground. This rolling motion might appear to aid walking economy, but the mechanisms that may lead to such a benefit are unclear, as the leg is not literally a wheel. We propose that there is indeed a benefit, but less from rolling than fr...
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The human ankle produces a large burst of 'push-off' mechanical power late in the stance phase of walking, reduction of which leads to considerably poorer energy economy. It is, however, uncertain whether the energetic penalty results from poorer efficiency when the other leg joints substitute for the ankle's push-off work, or from a higher overall demand for work due to some fundamental featur...
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Elastic-plastic behavior of a beam made of functionally graded material is investigated in this work. The beam is subjected to the constant axial and bending loads and the critical values of these loads for yield, collapse and elastic-plastic conditions are obtained. The variation of elastic modulus and yield strength through the height of the beam is determined with an exponential rule....
متن کاملThe Mechanical Consequences
SINCE its description as a clinical entity in 1930,1 the Wolff-Parkinson-White (WPW) syndrome has been the object of much study and speculation. The essential feature of the disorder is early anomalous activation of at least a portion of the ventricular myocardium as indicated by the "delta" deformity of the QRS complex. Shortening of the P-R segment to 0.12 second or less is accompanied by var...
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ژورنال
عنوان ژورنال: Progress in Biophysics and Molecular Biology
سال: 2008
ISSN: 0079-6107
DOI: 10.1016/j.pbiomolbio.2008.02.015