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This paper derived the continuity and momentum equations of solid-liquid two-phase flows using infinitesimal body analysis and obtained well-posed equations of two-dimensional (2D) flow-sediment movement. Based on the theory of solid-liquid two-phase flow, the momentum equations of the bedload sediment were deduced and a closed form of the 2D total sediment model equations was established. Then, the exchange mechanism of suspended sediment and bedload sediment and their computational method were elaborated on in great detail. Combined with the basic theory of one-dimensional (1D) flow-sediment movement, a flow-sediment numerical model of one and two dimensions was established for the region of Yongding New Estuary. A series of model verifications were carried out, which showed that the model can be adopted to simulate the flow-sediment movement in this region. This model was then applied for the environmental assessment of Taida Sea Reclamation Project. The conclusions indicate that the backwater effects of the proposed construction scheme would be fairly small and that the deposition amount in the river would be greatly reduced owing to the source of alongshore sediment transport being blocked by the project. This study provides a scientific model and method for the feasibility study and environmental assessments of construction projects. [ABSTRACT FROM AUTHOR]

This cross-sectional study set out to identify the health status and health beliefs and behaviors with regard to TB and HIV-AIDS among 407 rural male migrant workers in China. Surveyed workers' awareness level for AIDS transmission was 67.7% and for TB transmission 56.8%. These workers had high rates of acute illness in the previous month (depression 18.3%, physical injury 16.3%, dermatological ailment 9.6%, respiratory infection 9.4%). One or more of the four symptoms of TB were found in 22.3% of the workers. Prevalent TB symptoms were associated with previously having had TB (chi-square = 69.98, p = .000) and having previously lived with a TB patient (F = 13.99, p = .000). The relative risk for having had TB if the worker had lived with someone with TB was 5.69 (chi-square 7.65, p = .006). Screening for TB symptoms, a history of having lived with someone with TB, or having previously had TB, has the potential to serve as a cost-effective and easy first-line TB screening among large mobile populations.