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To determination organic compounds in landfill leachates,the landfill leachates were extracted with a PT-C18 column and the extraction liquid were analyzed with a gas chromatograph coupled to an mass-selective detector(GC-MS). The results showed that total 162 kinds organic compounds been determinted out. One of them , there are 22 kinds of Chinese priority pollutants and 32 kinds united states environmental...
TA4SP is a state-of-art tool of AVISPA that can automatically verify security protocol with unbounded number of parallel sessions. But it still has some limitations and can't verify hierarchy of authentication automatically. In this paper, we use an approximation-based model to define security protocol and design an algorithm close to the real implementation to calculate the fix-point tree automata...
CAP, a classical problem in cellular mobile communication networks such as GSM/GPRS or CDMA cellular mobile networks, refers to assigning a limited number of available channels to many mobile voice or data users while minimizing electromagnetic interferences. Most existing researches on CAP focus mainly on channel separation constraints, but pay little attention to geometric constraints defined by...
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