Advanced Materials Research Vols. 347-353

Abstract: Wind power has entered a rapid progress stage. Due to the intermittency of wind energy and the non-linearity of power system, there exist many uncertain variables which should be considered in the wind power prediction. Accurate wind power forecastings are beneficial for wind plant operators, utility operators, and utility customers. The current forecasting methods include persistence method, physical method, statistical method, and the comprehensive one combing all the other methods. This paper provides a detail review on wind speed and wind power forecasting methods based on recent available published papers. Several forecasting models were discussed and a lot of researchers on the models, which have their own characteristics, were presented. An overview of comparative analysis of wind forecasting time scales is discussed as well.

Abstract: Ce0.67Zr0.33O2 (CZ) nanorods are successfully synthesized by glycol-assisted hydrothermal method using zirconium oxychloride, cerium nitrate and urea, with the presence of sodium hypochlorite. The products are characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectra. The catalytic oxidation characters about Pd/CZ three-way catalyst (TWC) prepared with different loads of Pd are also investigated. The results show that the as-prepared Pd/CZ has excellent catalytic oxidation character to CO.

Abstract: In the last three decades of rapid economic growth since the reform and opening-up, the traditional manufacturing mode of “high investment, high consumption, high pollution” along with unilateral pursuit of fast-growth of GDP makes resources and environmental problems emerged. Via high-tech, remanufacturing industry which is based on circular economy revitalizes waste products, dramatically improves the efficiency of resources utilization and reduces pollution in the manufacturing process, leading the transformation of economic development pattern. It is a kind of promising strategical industry in the sustainable development of regional economy. With the guidance of industrial cluster theory, it will create a new growth pole for regional economic development through vigorously developing remanufacturing industry, forming industrial clusters and remanufacturing industrial zones with regional and industrial characteristics and perfecting relevant laws and regulations and strengthening the industrial chain.

Abstract: A numerical study on a gas-solid model to predict the particle flow structures of dual support-leg fluidized bed has been conducted. Due to the symmetry motion trajectory of the particles in the dual support-leg fluidized bed, unilateral furnace was taken into account in the model to simplify calculation. The results indicate that, without buffer set on the wall, three different zones can be distinguished in terms of granular flow mechanisms. The velocities of the upward flow without buffer set on the wall are much higher than that with buffer set.

Abstract: Biomass direct combustion power generation is the most simple but effective way in dealing with environmental issues and energy crisis. A comprehensive diagnosis with accurate evaluation of energy saving potential of a given biomass power plant is of great importance in lowing the cost of generating electricity, reducing the consumption of energy and pollutant emissions [1]. This paper throws light upon an innovative energy consumption diagnosis method-the specific consumption analysis theory, which is based on the First and Second law of thermodynamics [2,3]. Taking a given biomass power plant of National Energy Group as an example, mathematical models are made based on all the components and processes. The specific consumption analysis theory is employed to calculate the specific consumption within the biomass power plant using design parameters under design operating conditions, thus demonstrating the specific consumption distribution in the power plant, which provides theoretical basis for energy-saving and optimization in biomass power plant.

Abstract: Vibrio anguillarum is an opportunistic pathogen of aquatic animals, biocontrol agents have been revealed effective in preventing this disease. Antarctic bacteria were used for the screening of antagonism against V. anguillarum and strain AN32 showed highest activity. AN32 was identified as Pseudoalteromonas according to its morphological, physiological and biochemical and 16S rDNA molecular properties. The antibacterial substance in AN32 culture supernatant was sensitive to pH, temperature and proteinases. The substance could not dissolve in organic solvents, but could be precipitated by ammonium sulfate. These characterizations indicated that the bioactive substance of strain AN32 would be some kind of protein or peptide. This study is a potential application in the control of aquiculture diseases.

Abstract: This paper made some researches of modeling on the systems of the large-scale photovoltaic（PV） power station, and established the PV model, the rectifier and inverter circuits and so on. Using MATLAB and PSASP, simulation and analysis of grid-connected characteristics about the large-scale PV power station in weak grid systems were carried out, focusing on the transient stability in the fault condition of the line-side and the power quality. These two simulation results had good consistency, which demonstrated the accuracy of the large-scale PV power station model in this paper and the analysis of its grid-connected characteristics. The conclusion of this paper will provide some theoretical basis of improving the stability of grid-connected and reducing the harmonic current in weak grid systems, and will also provide some theoretical basis and the guide of grid-connected for the new energy strategy of our country in the future.

Abstract: A serials of experiments were carried on the pin-on-disc friction and wear tester. The friction and wear behaviors of on four materials couple with electric current were studied on in different conditions. The result indicates that properties of materials couple have a significant influence on the test results. The friction coefficient is the highest in process of the copper-impregnated metallized carbon rubbing against pure copper couple, and its wear volume of carbon strip material is also the largest. However, the friction and wear volume of copper-impregnated metallized carbon/stainless steel and pure carbon/pure copper couples are lower. Therefore, both friction couples are appropriate for pantograph strip/contact wire couple.

Abstract: In China, most of undeveloped oil reserves are low and ultra low permeability reservoirs. The total remaining petroleum reserves of CNPC is about 4.07×107m3, and the low and ultra low permeability reserves is 3.16×107m3, So it is important to reasonable develop the oil reserves to keep the petroleum output stable. Under the low permeability layer condition, it is difficult to inject water to the formation, and the output of oil well is very low. The chemical agent can solve the difficulty of injection water and enhance the oil recovery. The relative permeability experiments shows irreducible oil was reduced by the wettability alteration agents, and the mobile oil saturation increased, which enlarging the range of the two phases co-flowing and enhancing oil recovery. As a result with alteration agents, the cross-point relative permeability moves to right, and the core converts to water-wet. In daqing oil field test, the water injection pressure is reduced by 15%, and the term of validity is more than 10 months.

Abstract: Heat transfer of a thermosyphon radiator was analyzed, experimental tests with acetone as working fluid have been performed, and good agreement between measurement and calculation with analysis model was obtained. Compared with conventional radiator by means of experiments and analysis, the advantages and disadvantages of the thermosyphon radiator were discussed.