The effect of both single- and two-step direct current (DC) annealing procedures on the magnetic properties including giant magneto-impedance (GMI) of glass-coated Co66Fe6Si13B15 amorphous wires was evaluated. The GMI ratio initially increased with current intensity and reached a peak value before declining at higher current intensities for both methods. A maximum improvement of the GMI ratio by about 5 times was obtained for the two-step DC annealed sample, while that for single-step DC annealed samples was only 2.44 times. A higher GMI sensitivity is also observed for the two-step DC annealed wires. The better GMI performance for two-step DC annealed samples was attributed to the more homogeneously distributed precipitations in the matrix and ordered circumferential magnetic domains on the surface. The obtained result further implies that DC annealing with higher current intensity but shorter treatment time is a more efficient and energy-saving method to enhance the GMI performance for the Co-based amorphous wires with respect to potential industrial application.
The study of species population change is one of the most classic topics in biology. In this paper, we consider not only intra-race competition but also competition between two species. It is assumed that the resources in the environment are finite in this paper. Improved on the Logistic Population Growth Model from Malthusian model, we built the Competitive Hunter Model for trout and bass referring to the Lotka-Volterra Model. In this paper, we presented the assumptions of the model and analyzed the equilibrium points of the model in numerical analysis and the typical trajectories in phase planes in graphical analysis.
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