时间：2011-03-11 23:11来源：蓝天飞行翻译 作者：admin 点击：次
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control rod (nuclear reactor). A rod used to control the amount of activity in a nuclear reactor. It may be a fuel rod or a neutron-absorbing rod. control sector (air traffic control). An airspace area of defined horizontal and vertical dimensions for which a controller or group of controllers has air traffic control responsibility, normally within an air route traffic control center or an approach control facility. control slash (air traffic control). A radar beacon slash representing the actual position of the associated aircraft. Normally, the control slash is the one closest to the interrogating radar beacon site. When ARTCC radar is operating in the narrow-band (digitized) mode, the control slash is converted to a target symbol. control snubber (boosted aircraft control system component). A device in a hydraulically boosted aircraft control system that cushions the movement of a control at the end of its travel. control stick (aircraft control system component). A vertical stick in the cockpit of an airplane with which the pilot operates the ailerons and elevators. Side-to-side movement of the stick moves the ailerons, and back-and-forth movement moves the elevators. Most modern airplanes use control wheels, rather than control sticks. control surface (airplane flight controls). Aerodynamic surfaces which can be moved from the cockpit of an airplane to cause the airplane to rotate about its three axes. The primary control surfaces are the ailerons, elevators, and rudder. control wheel (aircraft control system component). A wheel-like control in an airplane cockpit used by the pilot to move the ailerons and elevators. Rotation of the wheel moves the ailerons, and back-and-forth or in-and-out movement moves the elevators. Because the wheel does not rotate in a complete circle, most aircraft control wheels are not round, but are, rather, only segments of a wheel. control yoke. The movable column on which an airplane control wheel is mounted. The yoke may be moved in or out to actuate the elevators, and the control wheel may be rotated to actuate the ailerons. control zone (air traffic control). Controlled airspace which extends upward from the surface and terminates at the base of the continental control area. Control zones that do not underlie the continental control area have no upper limit. A control zone may include one or more airports. It is normally a circular area with a radius of five statute miles from the center of the airport and may include any extensions necessary for instrument approach and departure paths. convection (meteorology). Predominantly vertical movement of the atmosphere that results in mixing the atmospheric properties. Convection differs from advection, which is the horizontal movement of the atmosphere. convection (heat transfer). A method of heat transfer within a fluid by means of vertical currents. Heat is absorbed in the bottom layer of the fluid by conduction, and this heat decreases the density of the fluid. The less dense fluid rises and forces the cooler, more dense fluid down. |
