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We consider an overlooked, but important, practical problem about the optimal selection of cordon–screen lines for traffic census study in road networks. The problem can be stated as: (1) how to select the optimal locations of a given number of counting stations to separate as many origin–destination (O–D) pairs as possible, (2) how to determine the minimum(More)
An experimental program to study η rare decays with high precision and high statistics has been under development at Jefferson Lab with a 12 GeV energy upgrade to test fundamental symmetries of QCD. The first suggested experiment is to measure η → π0γγ and η → π0π0 channels simultaneously in Hall D. Three experimental techniques will be used to obtain the(More)
The Nam Dinh virus (NDiV) was isolated from Culex quinquefasciatus in Shenzhen, China, for the first time, in 2011. In this study, we characterized the ultrastructure of NDiV, determined its complete genome sequence and made comparisons with other known nidoviruses. Electron microscopic observation revealed that the NDiV strain isolated in China produced(More)
The Longgang Center for Disease Control and Prevention in Shenzhen city received a report of a food poisoning outbreak among employees of the Xiang-Mu-Yuan furniture-manufacturing factory on March 16, 2013. Thirty-six of 170 employees who ate dinner at the cafeteria of the factory on March 14 were admitted to a local hospital owing to diarrhea and abdominal(More)
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