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Beijing has recently unveiled a number of policy measures to disperse migrants and reduce population density in one of China's most populated cities and the capital. This report explores the success of these dispersal policies by answering two key questions: who left Beijing as a result of what policies and how policy impacts interact with personal choice. According to the results, occupational relocation policies have more direct effects on attracting migrants to leave Beijing than with educational and housing policies.
Source link: https://onlinelibrary.wiley.com/doi/10.1002/psp.2606
Abstract Seed dispersal by wind is one of the most common dispersal methods in plants. The most important seed trait that influences seed dispersal by wind is the effective terminal velocity, or the maximum dropping speed of a seed in still air. Accurate estimates of Vt are essential for predicting intra-u2010 and interspecific variability in seed dispersal ability. The seed trajectories at high temporal resolution are then determined by automated image processing, which then leads to three-u2010 dimensional seed trajectories. We tested Vt with a numerical model of free fall with air resistance to estimate the estimation of Vt. We validated this technique by comparing the estimated Vt of spheres of different diameters and materials to theoretical values and comparing the estimated Vt of seeds in a vertical wind tunnel. Seed measurements for spheres and vertical wind tunnels closely match theoretical expectations for spheres and vertical wind tunnel measurements.
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