Browsing by Author "Tang, S."

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    Biflavonoids with cytotoxic and antibacterial activity from Ochna macrocalyx
    (Georg Thieme Verlag, 2003) Tang, S.; Bremner, Paul; Kortenkamp, A.; Schlage, C.; Gray, A. I.; Gibbons, S.; Heinrich, M.
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    Case Study of Urban Water Distribution Networks Districting Management Based on Water Leakage Control
    (ASCE, 2009) Wu, S.; Li, Xiaohong; Tang, S.; Zhou, Y.; Diao, Kegong
    Globally, water demand is rising and resources are diminishing. Most of the world's water systems have been highly successful in delivering high-quality water to large populations. However, most of these systems also incur a notable amount of loss in their operations. Water loss from the water supply system has long been a feature of operations management, even in the countries with a well-developed infrastructure and good operating practices. There is no doubt that the sustainable management of water supply system is a challenge for the whole world. Water leakage cannot be completely avoided, but they can be managed so that they remain within economic limits. Some new models of water loss management have been developed recently. As the technical and economic levels varied in different cities, the best practice using in their water supply systems leakage control should be taken suited to local conditions. In this case study a water loss management strategy for a large city in north China was suggested and the technological means for the optimized its managing were provided. The basic principles for structuring district meter areas in this water supply system according its features were developed. The GIS as the tool was used during the study. Based on the field test, the water balance calculations of three DMAs were carried out, and using the fuzzy appraisal method to evaluated their degree of water losses.
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    Phenylpropanoids NF-KB inhibitors from Bupleurum fruticosum.
    (Georg Thieme Verlag, 2004-09-01) Bremner, Paul; Birkmayer, H.; Fiebich, B. L.; Tang, S.; Muñoz, E.; Marquez, N.; Rivera, D.; Heinrich, M.