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“passive”
passive
(adjective), more passive, most passive
1. Referring to a person who is influenced or acted upon without acting in return; offering no opposition or resistance: A passive behavior or conduct can also be described as receiving or enduring without resistance, being submissive, unassertive, or compliant.
2. In aviation, pertaining to a conveyance or thing that does not power itself: A passive flight, like gliding and soaring, or a balloon are just two examples of such passive airborne vehicles or objects.
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“passive”
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“passive”
electronic spread, passive spread
In neurophysiology, the phenomenon of changes in polarization along one point of an axon (nerve fiber of a neuron that carries the unidirectional nerve impulse away from the cell body), causing changes in polarizations in neighboring regions.
passive euthanasia
Death resulting from the cessation of "heroic measures", or undertaking a procedure of therapy that is associated with an element of daring, or boldness, taken in an attempt to save a patient's life so as to prolong a life.
The term "heroic measure", refers to an aggressive, daring procedure in a dangerously ill patient that, in itself may endanger the patient but also has a possibility of being successful; whereas, a lesser degree of efforts would inevitably result in failure.
passive tag
1. An RFID tag without a battery.
When radio waves from the reader reach the chip’s antenna, the energy is converted by the antenna into electricity that can power up the microchip in the tag.
The tag is able to send back information stored on the chip. Today, simple passive tags cost from U.S. 20 cents to several dollars, depending on the amount of memory on the tag and other features.
2. A tag that contains no internal power source.
It typically derives its power from the carrier signal radiated from the scanner or reader. This type of tag is used in all library RFID systems.
semi-passive tag
Similar to active tags, but the battery is used to run the microchip's circuitry but not to broadcast a signal to the reader.
Some semi-passive tags sleep until they are woken up by a signal from the reader, which conserves battery life.
Semi-passive tags can cost a dollar or more. These tags are sometimes called battery-assisted tags.
