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Tim Stubbs 《International Studies in Sociology of Education》2013,23(2):97-124
The publication of Trading in Futures and When Schools Compete helped give empirical support to the view that choice policies increased differences between schools. However, dispute about this research and changes in policy mean that our understanding of the impact of school choice policies in New Zealand remains partial. This paper aims to address continued uncertainty about the impact of school choice policies in New Zealand. It presents the results of a study that drew upon qualitative data gathered in interviews with school principals and on administrative data on the enrolment patterns in the same competition space explored by the Trading in Futures research. The data show that periods of greatest instability in enrolments occurred around the time of change in regulations. 相似文献
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Nikolic-Jaric M Romanuik SF Ferrier GA Cabel T Salimi E Levin DB Bridges GE Thomson DJ 《Biomicrofluidics》2012,6(2):24117-2411715
Dielectric particles flowing through a microfluidic channel over a set of coplanar electrodes can be simultaneously capacitively detected and dielectrophoretically (DEP) actuated when the high (1.45 GHz) and low (100 kHz–20 MHz) frequency electromagnetic fields are concurrently applied through the same set of electrodes. Assuming a simple model in which the only forces acting upon the particles are apparent gravity, hydrodynamic lift, DEP force, and fluid drag, actuated particle trajectories can be obtained as numerical solutions of the equations of motion. Numerically calculated changes of particle elevations resulting from the actuation simulated in this way agree with the corresponding elevation changes estimated from the electronic signatures generated by the experimentally actuated particles. This verifies the model and confirms the correlation between the DEP force and the electronic signature profile. It follows that the electronic signatures can be used to quantify the actuation that the dielectric particle experiences as it traverses the electrode region. Using this principle, particles with different dielectric properties can be effectively identified based exclusively on their signature profile. This approach was used to differentiate viable from non-viable yeast cells (Saccharomyces cerevisiae). 相似文献