Advanced Materials Research Vols. 347-353

Abstract: According to the nonlinearity and uncertainty of the water quality data samples, a forecasting model based on Simulated Annealing Genetic Algorithm(SAGA)and least squares support vector machines(LS-SVM) is proposed. Through adaptively optimizing the model parameters of LS-SVM by SAGA, we can apply the model to forecast water quality of Poyang Lake. The experimental results indicate that compared to the typical LS-SVM,the model is very practical and with higher precision.

Abstract: In this paper, several types of binary nanofluids were prepared by mixing TiN, SiC, carbon black nanoparticles with emulsifier OP-10, and Al2O3 nanoparticles with sodium dodecyl benzene sulfonate (SDBS), to ammonia-water solution, respectively. The influences of ammonia, nanoparticles, and surfactant on the surface tension of the binary nanofluids are investigated by using a QBZY-1 digital surface tensiometer. The results show that the surface tensions of ammonia water decrease approximately linearly with the increase of ammonia content. For the nanofluid (TiN, SiC) without surfactant, the nanoparticles can softly reduce the surface tension of the binary nanofluids. While for the nanofluid (Al2O3, carbon black) containning surfactant, the existences of surfactant greatly reduce the surface tension of the binary nanofluids. When the content of surfactant is lower than critical micelle concentration(CMC), adding nanoparticles can increase the surface tension of the fluids, which may be caused by the decrease of the “free” surfactant content induced by the adsorption of surfactant on the surface of nanoparticles.

Abstract: It’s a new challenge to power system stability with large wind farm’s integration. Taking the wind farm which consist of GE1.5MW double fed induction generators that has been modeled in the software PSS/E as the research object, The difference between the impact of wind farm and conventional generators integrated to grid in power system transient progress is analyzed. Besides, the impact on transient progress of increasing wind farm penetration and differnet interconnection with wind farm to power system is investigated.

Abstract: With the harsh maritime environment, the accessibility of the site leads to the high cost directly. The cost on Operation & Maintenance for offshore wind farm is about twice of equivalent onshore wind farms. Consequently the study on the maintenance strategies is necessary. The objective of this work is to optimize the offshore wind farm maintenance strategies by network planning method, to minimize the total cost, by considing the effect of several factors, such as weather, boat availability, the location of the wind farm and ect.

Abstract: A new material on adsorption of Pb(Ⅱ) was introduced in this paper. EG was modified by soaking in KOH. MEG (modified expanded graphite) was characterized by SEM, XRD and FTIR. The removal rate of Pb(Ⅱ) rose to 92.23% from 59.14% on MEG . And the adsorption quantity came up to 46.3869mg/g from 31.9662mg/g. All above shows that MEG has better adsorption performance.

Abstract: The liaoning province is big province of mineral resources, although some energy and nonmetallic minerals resource reserves have among the top, but the rare earth provide strategic significance of mineral resources is the shortage, and molybdenum resources reserves to reduce year by year. This article through the objective analysis of molybdenum in liaoning province, the rare earth mineral resources exploration, status quo and the existing main problems of rare earth mineral resources, the province of molybdenum and long-term forecast the recent demand, in the province of mineral resources planning, provides the basis.

Abstract: Fe-Cu-K₂O-La₂O₃ catalysts were prepared by special impregnation on the SiO₂, ZrO₂ and SiO₂-ZrO₂. Some factors of influence on catalytic activity were researched,such as the content of active component Cu and La, calcination temperature, reaction temperature and space velocity. The structures and physicochemical properties of the catalysts were characterized by XRD and TEM. When the SiO₂-ZrO₂ play the role of carrier , Fe:Cu:K:La = 100:15:7:7:250:250, the calcination temperature is 773K, the reaction temperature is 613K and space velocity is 2400ml • h^-1 • g^-1 _(cat), the catalyst shows the best catalytic activity , if the reaction pressure is 0.1 Mpa , and the molar ratio of H₂ to CO₂ is 3 . The conversion of CO₂ is more than 64%. Light olefin’s selectivity is more than 25%.

Abstract: To a closed type parabolic trough solar collector, thermal performance was analyzed, a mathematical model was set up, and test-bed of collector to heat efficiency test was built. According to the experiment test data, the accuracy of the thermal mathematics model was validated. The results show that the model simulation accuracy is so higher that the model is reasonable and available.

Abstract: Experiments on treatment of simulated printing and dyeing wastewater by prepared titanium-based electrode coated manganese dioxide doped with cerium were carried out in this paper. Factors such as current density, electrolyte concentration, solution pH value, electrolysis time, initial concentration of simulation printing and dyeing wastewater on the effect of treatment were also investigated. It is showed that: utilizing the self- prepared electrode to treat printing and dyeing wastewater in optimized conditions, which current density is 30mA/cm2, electrolyte (sodium chloride) concentration is 0.1 mol/L, electrolysis time is 80min, and pH is 9, 92% and 97% of CODcr and color removal were achieved, respectively.

Abstract: Various depths paddy soils, which collected from nearby one of the abandoned Pb-Zn mines in Lanping County of China, were analyzed, determining the total metal concentration by acid digestion and the chemical speciation of Zn, Pb, Cu and Ni by a somewhat modified Tessier’s sequential extraction method. High concentrations of Zn and Pb were found in surface soils indicating that the paddy soils seriously suffered from Zn and Pb contamination. The extraction percentage of Zn, Pb, Cu and Ni with modified Tessier’s sequential extraction procedures were at the ranges of 93.15-96.41%, 93.26-96.25%, 91.51-94.75% and 91.28-94.25%, respectively. Extraction efficiencies demonstrated that this sequential extraction approach is suitable to evaluate these metals potential risk among this contaminated site. Extraction results showed that the residual fraction was the predominant fraction for Zn, Pb, Cu and Ni among all tested soils. However, the exchangeable fraction was the lowest among all fractions. Meanwhile, the metals mobility and bioavailability in tested soils were compared and predicted using mobility coefficients and bioavailability coefficients. The mobility coefficients of metals decreased in the order of Cu> Ni> Zn> Pb, and the bioavailability coefficients of metals decreased in the order of Pb>Cu>Zn/Ni.