Flooded sediments and normal river sediments have similar sedimentary features in stratigraphic profiles. It is difficult to distinguish these two types of sediments only based on sedimentary ...features. In order to identify the ancient flood disaster events, it is significant to establish identification marks of sediments from the environment magnetism. We have made a systematic sampling and measuring, and compared the magnetic fabric character of Paizhouwan dam‐broken fan deposits of 1998 with that of modern flood land deposits of the Yangtze River nearby Paizhouwan. Combined with the magnetic fabric character of flood land sediments in lower reaches of the Yangtze River, we reveal that the features of magnetic fabric of normal river sediments in middle and lower reaches of the Yangtze River are greatly different from that of dam‐broken fan deposits. And they are closely related with the sedimentary environments. So it is an effective method for distinguishing flood sediments and normal river sediments through measuring magnetic fabric parameters of sediments in the middle reaches of the Yangtze River and studying the shape of magnetic anisotropy susceptibility magnitude ellipse.
This paper introduces the composition, control method and testing results of the integrated control system for the first tidal flow electricity generating (TFEG) ship of China. The control method, ...control algorithm and the specific circuits for the hydraulics system are also introduced. Our research works are emphasized on the control algorithm of stabilizing frequency and some special problems of the controller. The related protection measures for hydraulic system and TFEG system have been taken. A brief explanation of the water turbine control is given.
Although wind energy is one of the sustainable, environmentally friendly renewable energy sources, the large-scale wind power fluctuations maybe exert adverse impact on the system operation economics ...of the power system due to the intermittency of wind power. In this paper, a net benefit evaluation model of wind power considering operational regulation cost of thermal plants for balancing power variation is established from the view point of the contribution to system generation benefits, which is used to evaluate systematically the net benefit of the output increase of wind farms. The proposed method takes into account the comprehensive benefit of the increased wind power as well as the operational regulation cost of grid-connected thermal plants invoked by the increase of wind power. The simulation results illustrate that the net benefit of output increase of wind farms is closely relative to the operational regulation cost of grid-connected thermal power plant for balancing power variation and is related to the price of fossil fuel and cost of pollutants closely.
Casting nylon 6 (MCPA6) / nanometre Nitrile Rubber (nano-NBR) copolymer alloys had been prepared by in situ anionic polymerization. Fourier transform infrared spectroscopy (FTIR) study shows that the ...nitrile group of nano-NBR occurred alkaline hydrolysis reaction and participated in copolymerization with caprolactam. Scanning electron microscopy (SEM) reveals that the interface interactions between nanometre Nitrile Rubber and MCPA6 in the alloys changed with the amount of the nanometre Nitrile Rubber added. With 2% nanometre Nitrile Rubber (based on weight), the phase morphologies of the alloys indicate the best compatibility of nanometre Nitrile Rubber in MCPA6, with optimal bind strength between nanometre Nitrile Rubber and MCPA6. DSC study indicates that nano-NBR didn't affect nylon's original crystal form but increased the proportion of more stable α crystal. Comparing with untreated MCPA6, 2% nanometre Nitrile Rubber increases the alloy's elongation by 92% and Izod impact strength by 57.5%.
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