航空术语词典Dictionary of Aeronautical Terms 中

时间：2011-03-11 23:13来源：蓝天飞行翻译 作者：admin 点击：次

modulator (electronic circuit). The circuit in a radio transmitter that modulates the carrier, or places information (data) on the signal being transmitted.
moiré. An independent pattern formed when two regular geometric patterns are superimposed (one placed on top of the other), with the one on top not exactly lined up with the one on the bottom.
A moiré pattern is formed when a piece of transparent film having a series of closely spaced straight lines is placed at a slight angle over a print of the same size lines with the same spacing.
moisture. Water contained in a mass of air. The water may be in the form of vapor, or it may be tiny droplets of haze, mist, or fog.
moisture separator (pneumatic system component). A component in a high-pressure pneumatic system that removes most of the water vapor from the compressed air. When the compressed air is used, its pressure is dropped, and this pressure drop causes a drop in temperature. If any moisture were allowed to remain in the air, it would freeze and block the system.
The separation is normally done by centrifugal action of the air that slings the moisture out into an area where it can be collected and drained when the system is shut down.
mold line (sheet metal layout). A line used in the development of a flat pattern for a formed piece of sheet metal. The mold line is an extension of the flat side of a part beyond the radius. The mold line dimension of a part is the dimension made to the intersection of mold lines and is the dimension the part would have if its corners had no radius.

mold point. The intersection of two mold lines of a part. Mold line dimensions are made between mold points.
mold release agent. A lubricant used to coat a mold in which plastic resin is formed. Resin does not stick to the release agent, and the part can be taken from the mold when the resin has cured. A mold-release agent is also called a parting agent.
molecule. The smallest particle of a substance that retains all the properties of the substance. A molecule is made up of one or more atoms.
molybdenum. A hard, gray, metallic chemical element. Molybdenum’s symbol is Mo, its atomic number is 42, and its atomic weight is 95.95. One of the main uses of molybdenum is as an alloying agent for steel. Molybdenum increases the toughness of steel and makes it easy to weld and machine.
moment. A force that causes or tries to cause an object to rotate. The moment of a lever is the distance, in inches, between the point at which a force is applied and the fulcrum, or the point about which a lever rotates, multiplied by the force, in pounds. Moment is expressed in inch-pounds.
Moment = distance . force
In weight and balance, a moment that causes a nose-down condition is a negative moment, and one that causes a nose-up condition is a positive moment.
moment index (weight and balance). A moment divided by a constant, such as 10, 100, 1,000, or an even larger number. The use of a moment index allows weight and balance computations to be made using smaller numbers, and this decreases the chance for errors.

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