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In this paper, the functions of the received power-distance were deduced and analyzed under the different train operating conditions at first. Based on these functions, an improved path loss model, the triple-slope path loss model, for high-speed railway control signal was raised. And the proposed path loss model was verified by the test data at high speed railways in China. The application area of...
This paper takes CSI 300 index futures as the research object, bases on actual market data, it calculates the optimal hedge ratio with VAR model, VECM model and GARCH model, analyses the hedging effectiveness, gets some corresponding results, and puts forward some recommendations for investors.
The traditional dry beneficiation such as the pneumatic separator, the pneumatic jig and the air table, has low efficiency and with heavy dust pollution, can't meet the requirements of the modern beneficiation. The technology of the air-dense medium fluidized bed concentration, an effective dry beneficiation, can solve the above problems. This paper presents the separation principal of the air dense...
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