Advanced Materials Research Vols. 347-353

Abstract: The short-term joint optimal operation simulation of Three Gorges cascade hydropower system aiming at maximum power generation benefit is proposed. And a new method for optimizing cascade hydropower station based on Adaptive Genetic Algorithm (AGA) with trigonometric selective operators is presented. In this paper, the practical optimal operation in power market is described. The temporal-spatial variation of flow between cascade hydropower stations is considered, and time of use (TOU) power price is also taken into account. Moreover, a contrast between Tangent-roulette selection operator and traditional one is made. To a certain degree, the results of simulative optimal operation based on several representative hydrographs show that Tangent-roulette wheel selection operator can find a more excellent solution, because the Tangent-roulette one can overcome the fitness requirements of non-negative. The research achievements also have an important reference for the compilation of daily generation scheduling of Three Gorges cascade hydropower system in the environment of power market.

Abstract: Polyphenylene sulfide-intercalated layered manganese oxide (PPS-MnO₂) nanocomposite is synthesized via the delamination/reassembling process. SEM images and XRD analysis indicate that the surface of the nanocomposite material is layered and the basal spacing of PPS-MnO₂ was 1.69 nm. The maximum specific capacitance as obtained from cyclic voltammetry was 524.0 F•g⁻¹. The specific capacitance decreases by 6% of the initial value over 1000 cycles at a high current density of 2mA•cm^-2.

Abstract: Temperature stratification in large space interior is relatively obvious. This paper selects the structure experimental plant and Wuhan station as the research objects, and monitors the temperature of the atrium, north and south waiting hall of the Wuhan station and structure experiment plant, lastly analyses the factors of the temperature stratification based on the measured data. At the same time exploring the law of the temperature stratification with height, time, and the position will deepen to the temperature stratification theory of the large space.

Abstract: In this paper, linear regression method is used to deal with the flow transmission. Applying large -scale system decomposition-coordination method, the paper analyzes the optimal operation problem of cascade hydropower stations. In order to research the uncertainty of the optimal operation of cascade reservoirs, this paper presents a method which combines it with the random simulation, which uses the method of Latin hypercube sampling to improve Monte Carlo method. The study case of Three Gorges cascade reservoirs shows that the method is practical

Abstract: Construction industry is an important tache and constitute in low-carbon city and emission reduction. Under the background of China’s low-carbon city, this paper has summed up the features of green residential buildings, and proposed the effective routes for the construction green residential buildings during life cycle, finally some suggestions were given from energy system, technologies and the point of government function.

Abstract: This article through researches in Lanzhou city of atmospheric aerosol water-soluble ion concentration change, air quality annual changes and the changes in the structure of Lanzhou city energy situation and put forward the solution and improve the urban air pollution approach. It provides a scientific basis for urban comprehensive development and pollution prevention.

Abstract: The power battery was manufactured with the commercial LiMn2O4 and graphite, and its storage performances with different charged state were studied. Structure, morphology and surface state change of the LiMn2O4 before and after storage were observed by XRD, XPS and AC technique, respectively. The result shows that the capacity recovery of LiMn2O4 stored at discharge state is best (99.2%). While that of full-charged state is worst (93.6%). The cyclic performance of LiMn2O4 stored at full-charged state is best (capacity retention ratio of 89.8% after 200 cycles), while that of before storage is 83.0%. The crystal of the spinel was destroyed after storage, and the intensity of breakage is increased with charged state increasing. The amount of soluble Mn and Li-ion migration resistance (Rf) are increased with chare state increasing, and the oxygen loss is detected.

Abstract: The airlift contact oxidation process is the combination of airlift technology with contact oxidation method. The process was used to treat domestic wastewater, the appropriate operating parameters were determined by experiment, and the operation stability, anti-impact loads and treatment cost of the process were also analyzed. The results show that this process has some advantages of compact layout, small occupancy area and low treatment cost. Under the conditions of air/water ratio of 16.8 and the hydraulic loading of 4.8m3/(m3•d), the average removal rate of COD and NH3-N reaches 80.1% and 58%, respectively. The effluent quality is stable and excellent, and it can be used as municipal miscellaneous water. The height of the media can be reduced due to its internal recycling system.

Abstract: Some high effective microbes, photosynthetic bacteria, nitrifying bacteria, and corn-pound bacteria etc were used, to degrade pollutants of lake and the restoration characteristics were investigated. The experimental results showed that the restoration effect appeared 4 days later and got the best condition 22 days later. CODMn, NH3-N, TN, Tp and chlorophyll-a decreased rapidly and DO was improved from 7.2 mg/L to 8.5 mg/L.Ch1.-a related well to TP, CODMn, TN.

Abstract: This article has introduced four different numeralization methods for the Complete Characteristic Curves of Pump’s, and these methods are applied for the calculation of water hammer that caused by pump-stopping. Then by using the performance curves of pumps with different specific speeds we had compared those four methods, and determined the optimal method for the reference of related engineering and technical personnel.