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The contamination status of perfluoroalkyl substances (PFASs) were investigated in 64 tapwater samples collected from 17 cities and 45 surface water samples from adjacent areas in the eastern China. The total PFAS concentrations in tapwater ranged from 1.4 to 175 ng/L; relatively higher PFAS levels were observed in samples collected from the Yangtze River Delta region, which was similar to the geographical...
It has been proved that Local-Period phenomena widely exsit in any chaotic binary sequence. Among the reasons of Local-Period phenomena existing, quantifications of chaotic binary random numnber generators are the key factor. This paper proposed that different quantifications could make sequences have different randomness from the same chaotic real-value seqence. The simulation results illustrated...
This paper introduces some results of our researches on Lorenz-based secure communication in time and frequency domains. These researches are focused on the characteristics of Lorenz system and processing it for its application in secure communication. In this paper, it gives the processing methods for Lorenz system, that is, filtering and frequency domain truncation method for test. Then, it also...
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