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We researched the permeability of different mix proportion. We compared the grading curve of the optimal grading by theoretical calculation (including aggregate and gelled material) and there mixture ratio of test. And we compared the permeability of different mixture ratio. We draws the following conclusions: Permeability of concrete with long age has close relationship with gradation including aggregate...
Feedback is the trading strategy of irrational investors. Positive feedback traderspsila buying or selling behavior is decided by the stock price of the preceding period. On the presence of positive feedback trading, stock market returns show characteristics which are different from these assumed in the classical financial theory, and thus make the stock market fluctuate extraordinarily. This essay...
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