We consider the one-dimensional oscillations of a charged point particle under restoring Coulomb force. find that, for very small amplitudes, speed remains almost constant. also obtain exact analytical expression finding oscillation period. It turns out to be monotonically increasing function amplitude. For this quantity is directly proportional amplitude itself.

TO THE EDITOR: The Viewpoint by Sierra-Johnson et al. (6) raises a number of interesting points about the control of leptin release in response to altitude exposure. The authors correctly point out that “altitude” can comprise many stimuli to the endocrine system including hypoxia, cold exposure, anorexia, and exercise. In fact, it is likely that these factors interact to make assignment of a m...

We have studied the pulmonary circulation of three closely related animals, the llama, alpaca, and guanaco. The mean pulmonary arterial pressure of 12 llamas and one alpaca indigenous to high altitude in the Andes was found to be slightly but significantly higher than that of three llamas and three guanacos born and bred at low altitude in England. On the other hand, the medial thickness of the...

Nepal, the home of the highest mountain peaks, is one of the most popular trekking destinations in the world. The Himalaya begins where other mountain ranges leave off. Local farmers have cut small terrace fields on the slopes of colossal gorges which have been carved out by large glacial fed rivers. Everest Base Camp located at an altitude of 5,360 metres (17,590 ft) is 1,000 meters higher tha...

Current guidelines for air travel state that patients with chronic respiratory diseases are required to use oxygen if their in-flight arterial oxygen tensions (Pa,O2) drop below 6.6 kPa. This recommendation may not be strictly applicable to cystic fibrosis patients, who may tolerate lower Pa,O2 for several hours without clinical symptoms. Lung function, symptoms, blood gas levels and signs of p...