Using high frequency intra - day data, we study the correlations between liquidity and trading activity and their time series property.

本文利用日内交易的高频分时数据，研究了流动性和交易活动之间的相关性和各自的时间序列性质。

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WLAN and Ad hoc networks are widely applied in different fields, but the limited frequency bandwidth will induce the inter-system and intra-system interference , and reduce the performance of network.

WLAN和自组织网具有广泛的应用前景。但有限的频率带宽会导致系统间或者系统内的相互干扰，降低网络性能。

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This paper analyzes the technology with intra-pulse chirp and inter-pulse stepped frequency to obtain high-resolution range profile. The echo expressions of static and moving targets are derived.

本文分析阐述了利用脉内调频、脉间跳频技术获取距离高分辨一维成像的可行性，导出了静止目标和运动目标的回波表达式。

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