 |
Business | Industries | Finance | Tax |
| Index: > A B C D E F G H I J K L M N O P Q R S T U V W X Y Z |
|
|||||
| First Prev [ 1 2 ] Next Last |
(Humans employ technology that uses the same principle: sonar for navigation of watercraft and medical ultrasound imaging to look inside the body.)
The ultrasound echolocation used by bats was first described by zoologist Donald Griffin in 1938Events January -June January 3 The March of Dimes is established by Franklin Delano Roosevelt. January 11 Frances Moulton is the first woman to become president of a US national bank. January 20 Wedding of king Farouk I of Egypt and Farida Zulficar in Cai when working as an undergraduate at HarvardHarvard University is a private university in Cambridge, Massachusetts, USA and a member of the Ivy League. It was founded on September 8, 1636 by a vote of the Great and General Court of the Massachusetts Bay Colony, making it the oldest post-secondary s.
Besides emitting ultrasonic pulses, bats employ two kinds of saccadeA saccade is a fast movement of an eye, head, or other part of an animal's body or of a device. It can also be a fast shift in frequency of an emitted signal, or other such fast change. Its purpose can be illustrated by the human eye. We do not look at as.
Both kinds of saccades result in improvement of the spatial information (distance and location) and resolution.
For a comprehensive description of the echolation used by bats see microbatThe microbats constitute the suborder Microchiroptera within the order Chiroptera ( bats). Other English names are "insectivorous bats", "echolocating bats", "small bats" or "true bats". All these names are somewhat inaccurate, because not all microbats f.
Dolphins emit a focussed beam of clicking sounds in the direction of their head; they receive the echo through the lower jar. When they approach the object of interest, they protect themselves against the louder echo by turning down the volume of the emitted sound. This is in contrast to sonar used by humans and bats, where the sensitivity of the sound detectors is turned down. See Bottlenose DolphinThe Bottlenose Dolphin Tursiops truncatus is the most common and well-known dolphin species. They inhabit warm and temperate seas worldwide and may be found in all but the Arctic and the Antarctic Oceans. Physical description Bottlenose Dolphins are grey; for some more details.
Note that echolocation can be a very sophisticated sense. Many people imagine echolocation to be something like a blind man tapping around in the dark. Closer to reality might be imagining a person walking around with a powerful adjustable torch, and seeing a clear landscape around him in color, though the colors might be a bit odd.
Bats can obtain additional information from phase shift in the echo from beating wings of insects, which "colors" the sound. Flat objects and invisible (in visible light) temperature inversions in water can act as mirrors. Underwater, sounds can travel quite a distance. Under certain conditions sounds have been known to carry over 100 km underwater.
These things combined make it possible for animals with echolocation to detect and react to conditions that human observers simply cannot detect, because the situation is out of the observers' range, can't be resolved by the human eye, or it might even be around a corner. This has rather interesting epistemologicalEpistemology is the branch of philosophy that deals with the nature, origin and scope of knowledge. Definition of knowledge Justified true belief Plato's Theaetetus''. defined knowledge as justified true belief. One implication of this definition is that implications when studying these creatures.
| Politics | Business | Finance |
 |
 |
 |
|