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Infinite descent, a method going back to Fermat to solve Diophantine equations; Descent (mathematics), an idea extending the notion of "gluing" in topology Hadamard's method of descent, a technique for solving partial differential equations
Descent rates are usually limited by equalisation issues, particularly with ears and sinuses, but on helmet dives can be limited by flow rate of gas available for equalising the helmet and suit, by carbon dioxide buildup caused by inadequate exhalation, and for divers breathing heliox at great depths, by high-pressure nervous syndrome. Ascents ...
In aeronautics, a descent is any time period during air travel where an aircraft decreases altitude, and is the opposite of an ascent or climb.. Descents are part of normal procedures, but also occur during emergencies, such as rapid or explosive decompression, forcing an emergency descent to below 3,000 m (10,000 ft) and preferably below 2,400 m (8,000 ft), respectively the maximum temporary ...
Descent procedures cover how to descend at the right place, time, and rate; with the correct breathing gas available; and without losing contact with the other divers in the group. [6] [83] Equalisation of pressure in gas spaces to avoid barotraumas. The expansion or compression of enclosed air spaces may cause discomfort or injury while diving.
'descent'; from κατὰ (katà) 'down' and βαίνω (baínō) 'go') is a journey to the underworld. Its original sense is usually associated with Greek mythology and classical mythology more broadly, where the protagonist visits the Greek underworld, also known as Hades. The term is also used in a broad sense of any journey to the realm of ...
In mathematics, the idea of descent extends the intuitive idea of 'gluing' in topology. Since the topologists' glue is the use of equivalence relations on topological spaces , the theory starts with some ideas on identification.
Abseiling (/ ˈ æ b s eɪ l / AB-sayl or / ˈ ɑː p z aɪ l / AHP-zyle; from German abseilen 'to rope down'), also known as rappelling (/ ˈ r æ p ɛ l / RAP-pell or / r ə ˈ p ɛ l / rə-PELL; from French rappeler 'to recall, to pull through'), is the controlled descent of a steep slope, such as a rock face, by moving down a rope.
Parachuting and skydiving are methods of descending from a high point in an atmosphere to the ground or ocean surface with the aid of gravity, involving the control of speed during the descent using a parachute or multiple parachutes.