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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calibration card (instrument accuracy). A card usually mounted near an instrument to show the amount of error in the instrument. Correct information can be obtained by reading the instrument and applying the correction shown on the calibration card. calibration curve (instrument accuracy). A curve plotted to show the instrument errors at different points on the scale. The error at each point is plotted on a graph, and these points are joined by a smooth curve. By using the calibration curve, it is possible to interpolate the error at points between those which have been plotted. californium. A radioactive, synthetic chemical element produced by bombarding curium with helium isotopes. Californium’s symbol is Cf, and its atomic number is 98. call-outs (aircraft drawings). Numbers and names used to identify components or parts in an aircraft drawing. Call-outs are normally placed near the part being identified and are connected to the part by a thin leader line. call sign (radio communications). Any combination of letters or numbers that identifies a communications facility. call-up (radio communications procedure). The initial voice contact between a facility and an aircraft. The call-up should include the identification of the facility being called and the facility initiating the call. calm (meteorology). The absence of wind or apparent motion of the air. calorie. The unit of heat energy in the centimeter-gram-second system of measurements. A large calorie (Calorie) is the amount of heat energy needed to raise the temperature of one kilogram of water one degree Celsius. A small calorie (calorie) is the amount of heat energy needed to raise the temperature of one gram of pure water from 14.5° to 15.5°C. One calorie is equal to 4.1868 joules of energy. calorimeter. An instrument used to measure quantities of heat released or absorbed during chemical reactions or physical changes of state. cam. An eccentric, or lobe, on a rotating shaft that changes rotary motion into linear motion. A cam, or lobe, on the cam shaft of a reciprocating engine opens the intake and exhaust valves at the proper time relative to the position of the piston in the cylinder. camber (aerodynamic shape). The amount of curve of an airfoil section. The curve on the top of the airfoil is called the upper camber, and the curve on the bottom is called the lower camber. |
