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Tang H.-D.,Hohai University | Tang H.-D.,Henan Polytechnic University | Zhu Z.-D.,Hohai University | Zhu M.-L.,Henan Polytechnic University | Lin H.-X.,Shanghai Investigation Design and Research Institute Co.
Advances in Materials Science and Engineering | Year: 2015

Mechanical behavior of 3D crack propagation and coalescence is investigated in rock-like material under uniaxial compression. A new transparent rock-like material is developed and a series of uniaxial compressive tests on low temperature transparent resin materials with preexisting 3D flaws are performed in laboratory, with changing values of bridge angle β (inclination between the inner tips of the two preexisting flaws) of preexisting flaws in specimens. Furthermore, a theoretical peak strength prediction of 3D cracks coalescence is given. The results show that the coalescence modes of the specimens are varying according to different bridge angles. And the theoretical peak strength prediction agrees well with the experimental observation. © 2015 Hu-Dan Tang et al. Source

Han T.,CAS Nanjing Institute of Geography and Limnology | Zhang H.,Taihu Basin Authority | Hu W.,CAS Nanjing Institute of Geography and Limnology | Deng J.,CAS Nanjing Institute of Geography and Limnology | And 2 more authors.
Environmental Science and Pollution Research | Year: 2015

An effective measure to cope with eutrophication of lakes is to remove nutrients that can cause algal blooming by taking advantage of natural water purification processes. Here, the term “purification” is defined, in a wide sense, as the potential role of a water body to contribute to the reduction of pollutants and thus controlling eutrophication. Also regarded as a kind of ecological regulating services, biological purification involves various processes concerning seasonal nutrient fixation, such as uptake by aquatic macrophyte, biofouling onto foliage substrates, feeding by organisms in higher trophic level, and eternal loss or removal of substance from the water. In order to evaluate the water purification ability, a numerical lake ecosystem model (EcoTaihu) was developed and applied to Lakes Taihu. The model includes the biological interactions between pelagic compartments (phytoplankton and zooplankton, detritus, dissolved organic matter, fish, and nutrients). Under dynamic forcing of meteorological and hydrological parameters, the model was run over years to evaluate the annual nutrient cycles and purification functions. The reproducibility of the model was validated for water body by comparison with the field data from the water quality monitoring campaign. Numerical results revealed that self-purification capacity of nitrogen of Lake Taihu in years 2006, 2008, and 2010 is 4.00 × 104, 4.27 × 104, and 4.11 × 104 ton, respectively, whereas self-purification capacity of phosphorus of Lake Taihu in years 2006, 2008, and 2010 is 1.56 × 103, 1.80 × 103, and 1.71 × 103 ton, respectively. © 2014, Springer-Verlag Berlin Heidelberg. Source

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