Word Entries containing the term:
“control”
A teacher at school had to go to an ophthalmologist to get her eyes examined because she couldn't control her pupils.
astrological birth control
A theory that a woman's fertile days can be determined with her relationship to the sun and the moon according to her birth date.
atmospheric control
(s) (noun), atmospheric controls
(pl)
A device or system designed to operate movable aerodynamic control surfaces to direct a guided missile in an atmosphere dense enough for such controls to be effective and the control provided by such devices: Judy read about atmospheric controls being able to conduct the direction of a projectile in an atmosphere thick enough for controlling instruments to be efficient.
biological control
The use of natural predators or parasites, instead of chemicals, to control pests.
The most famous successful example was the introduction of the gray moth, Cactoblastis cactorum, into Australia to control the prickly pear, Opuntia inermis, which was over running vast tracts of land. The moth's caterpillars eat the shoots of the plant.
Another example is the introduction of parasitic wasps that lay their eggs inside the eggs of pest insects; such as, corn borers that attack corn (maize).
Populations of insect pests may also be reduced by releasing sterile males to mate with the females, or by using sex-attractant chemicals (pheromones) to trap males or females.
This entry is located in the following unit:
bio-, bi-, -bia, -bial, -bian, -bion, -biont, -bius, -biosis, -bium, -biotic, -biotical
(page 18)
Biometrics: Important Role in Physical Access Control
A biometric tool that is important for physical-access
control.
This entry is located in the following units:
bio-, bi-, -bia, -bial, -bian, -bion, -biont, -bius, -biosis, -bium, -biotic, -biotical
(page 22)
Biometrics: Index of Units
(page 1)
control systems
The work specialty in the science of those systems in which one or more outputs are forced to change in a desired manner as time progresses.
electric control
1. Any electrical device; such as, a switch or a potentiometer (a resistor with three terminals, the third being an adjustable center terminal; used to adjust voltages in radios and TV sets), which is used to vary a circuit parameter.
2. The control of a machine by electric switches, relays, rheostats, or a resistor designed to allow variation in resistance without breaking the electrical circuit of which it is a part.
3. The control of a machine or instrument by switches, relays, or rheostats, as contrasted with electronic control by electron tubes or by devices which do the work of electron tubes.
electronic control unit, ECU
1. A term for any embedded system that controls one or more of the electrical systems or subsystems in a motor vehicle.
2. A microprocessor and memory with electronic maps, forming the central part of an engine management system or of subsystems; such as, a fuel injection or ignition system.
electronic control, electronic regulation
1. The control of a machine or a process by circuits using electron tubes, transistors, magnetic amplifiers, or other devices having related functions.
2. The control of a machine or condition by electronic devices.
electronic engine control, EEC
1. The engine management system that controls the ignition system and various other systems, including the exhaust gas recirculation and air-injection systems.
2. A precision control of engine-spark timing and exhaust gas recirculation for emissions control and fuel efficiency.
electronic motor control; direct-current motor control, motor control
1. An electronic instrument which adjusts the speed of a DC (direct current) motor when it is driven by an AC (alternating current) power line.
2. A control circuit used to change or to vary the speed of a direct-current (DC) motor operated from an alternating-current (AC) power line.
Silicon controlled rectifiers or power transistors rectify or correct the voltage and vary the field current of the motor.
This entry is located in the following units:
electro-, electr-, electri-
(page 66)
mot-, moto-, -motile, -motility, -motorial, -motoric, -motive, -motored; mov-
(page 2)
-tron, -tronic, -tronics +
(page 10)
electronic speed control
A system in which a motor's speed is controlled by feedback from a frequency-sensing circuit attached to the mechanism that is being powered.
Changes from the desired speed cause corrective signals to speed up or to slow down the motor.
geodetic control
(s) (noun), geodetic control s
(pl)
A system of horizontal or vertical control stations: Geodetic control structures have been established and adjusted by geodetic methods in which the shape and size of the Earth (or the geoid) have been considered in computing positions.
myoelectric control
Functioning by detecting electrical signals triggered by the contraction of muscles used which are used to control any normal hand.
Those signals are picked up by electrodes on the surface of the skin and they trigger movements in the hand and/or fingers.
optimal control
(s) (noun), optimal controls
(pl)
A control method in which a system's response to a commanded input is judged to be best as related to a specific performance criterion, considering the dynamics of the process to be controlled and the limitations of the involved measurements.
This entry is located in the following unit:
optim-
(page 1)
self-control
Control of one's emotions, desires, or actions by one's own will and self-discipline.
stochastic control theory
A branch of control theory that attempts to predict and to minimize the magnitudes and limits of random deviations in a control system by optimizing the design of the controller.
tacit arms control agreement, tacit-arms-control agreement
(s) (noun); tacit arms control agreements, tacit-arms-control agreements
(pl)
An arms control course of action in which two or more nations participate without any formal agreement having been made.
vehicle control technology
(s) (noun), vehicle control technologies
(pl)
Various control systems that are intended to help avoid collisions, to prevent or to decrease injuries when auto crashes take place, and ultimately to lead to full vehicle automation: A few existing vehicle control technologies include adaptive cruise controls, antilock brakes, and electronic malfunction indicators.