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Sigma KEE - FlowRegion
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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
流動區域
FlowRegion is a class of things whose boundaries are relatively stable but whose constitutive material is continuously moving through the region itself and being replaced by other, similar material. Each FlowRegion is constituted by a stream of matter moving as a whole. A FlowRegion may be liquid or gaseous. A wind may be considered as a Process or as a FlowRegion, similarly an OceanCurrent or a WaterWave. The motion process associated with a FlowRegion F is denoted by (FlowFn F). Note that certain properties belong to the FlowRegion itself (e.g., mass, length, volume, temperature, and speed or velocity of the region moving as a whole), while other properties of interest belong to the Motion of its constitutive stuff (e.g., velocity, direction). The motion of a FlowRegion as a whole (e.g., JetStream moves within the atmosphere) is distinguished from the motion of the pieces of stuff constituting the FlowRegion. See FlowFn and FlowRegionFn.
Relationships      
Parents Region A topographic location. Regions encompass surfaces of Objects, imaginary places, and GeographicAreas. Note that a Region is the only kind of Object which can be located at itself. Note too that Region is not a subclass of SelfConnectedObject, because some Regions, e.g. archipelagos, have parts which are not connected with one another.
Children 氣流AirStream is the class of FlowRegions that consist of air.
 StreamWaterAreaA relatively narrow WaterArea where the water flows constantly and in the same direction, e.g. a river, a stream, etc.
 浪潮A Tide is a vertical movement of the water level in a BodyOfWater due to the gravitational attraction between Earth and the moon. Tides are diurnally recurrent events. In most regions with tides, every day there are two high tides and two low tides. MixedTide represents a process in which the tides at either extreme are unequal.
 水流WaterCurrent is a subclass of FlowRegions consisting of moving water, especially those currents found within a well-identified area and having an established pattern of movement, such as an OceanCurrent, a RipTide, or a River. WaterCurrent is disjoint with StaticWaterArea. As a consequence, Lakes for example cannot be FlowRegions, however, currents may be present in a lake.


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