| 词汇 | saltation |
| 释义 | BETA Examples of saltationsaltation isn’t in the Cambridge Dictionary yet. You can help! We compare our results with previously proposed scaling laws for the transition between saltation and suspension. When saltation starts, a slight departure from the previous log profile is found. This should be a good test of the existence of saltation. Subsequently, saltation begins when particles move vertically into the air by a distance of the order of their diameter. Contemporary models of evolutionary biology simply do not allow for these kinds of rapid evolutionary saltations, certainly not within the time frame dictated. Without saltation, momentum is transported by the turbulence from the wind to the bed surface. An alternative explanation is that the fluctuating component of surface pressure may have an influence on the saltation rate. Thence, using the image analysis system on the microcomputer, saltation trajectory statistics, such as ejection and impact velocities, were calculated. The effects of particle density on the saltation trajectory could not be studied here independently of the more significant effects of friction velocity and particle size. Even so, within the saltation regime, there are interesting variations in the statistics of the particle motion according to the size, type and distribution of particles. In fact the explanation may be that there is a transition from saltation to suspension when u /ut > 1.5. Bagnold (1941) also identified four distinct subprocesses in the sand saltation system: aerodynamic entrainment, the grain trajectory, the grain/bed collision and wind modification. Note that in more dilute flows, such as in a powder cloud or a saltation layer, other segregation mechanisms dominate and the direction of segregation may reverse. Anderson (1989) described saltation in terms of an analogy with a biological population. Knight instead favors a model that leads to an abrupt saltation from ' protolanguage ' to the sudden appearance of full human linguistic ability. There is, in fact, already the very fullest con- saltation and collaboration at every stage. From the Hansard archive Example from the Hansard archive. Contains Parliamentary information licensed under the Open Parliament Licence v3.0 In air, this process of "saltation bombardment" creates most of the dust in dust storms. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. In the "lower flow regime", the natural progression is from a flat bed, to some sediment movement (saltation etc.), to ripples, to slightly larger dunes. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. From 1860 to 1880 saltation had a minority interest but by 1890 had become a major interest to scientists. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. There was also a debate over accounts of the evolution of mimicry and if they could be explained by gradualism or saltation. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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