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Correlation between spatial extent and duration of severe droughts process and its statistical law is analyzed using Palmer Drought Severity Index (PDSI) through a newly developed system of drought process monitoring. Results indicate that during the period from late 1990s to early 2000s, the percentage of severe drought (PDSI<;-3.0) in China is unprecedented since 1960 under the background of...
In order to investigate the efficiency of Chinese metal futures market, we studied the daily price series of China's copper and aluminum futures market. It was proved that the center parts of the distribution have a exponential form, followed by power-law tails, and the power-law exponent is larger than 3. Moreover, based on detrended fluctuation analysis (DFA), long memory was found in return and...
The Reliable and Self-Aware Clock (R&SAClock) is a new software clock aimed at providing resilient time information. It uses and exploits the information collected from any chosen clock synchronization mechanism to provide both the current time and the synchronization uncertainty, intended as a conservative and self-adaptive estimation of the distance from an external global time. This paper describes...
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