Advanced Materials Research Vol. 549

Abstract: For the water-diversion irrigation area which relies mainly on canal irrigation but easily results in secondary salinization, it is an imperative issue to set up a rational irrigation and drainage system. This paper, based on the principle of both water-salt balance and water amount balance, studies the irrigation and drainage system and the method of water saving and salinization prevention, and proposes an easy and practical method. The system and method are applied and tested in a typical irrigation area. The study is of great value to the design of the gravity irrigation and drainage area and the transformation of the secondary salinization irrigation area.

Abstract: Heavy metal concentrations in sediment samples from the Jiangsu coast were determined to explore the spatial distribution and the levels of contamination. The total Cu concentration in the wet season showed higher values than those of the dry season for all stations in Lianyungang coast. The highest CF values for Zn, Cr and Ni at S2, which receives a huge amount of metallic discharge from Zn and Cr mine in bulk in port of Lianyungang. Cu, Cr, Cd, Pb and Ni had the highest EF values at Yancheng coast and Cd had the highest EF values in Nantong region. The Pb and Ni concentration levels are mainly affected by natural sources in Nantong coast and the potential ecological risk indices of Cu and Cd in Yancheng coast, which indicated moderate potential ecological risk of two metals. And the risk associated with Cr in the sediment was moderate risk in most coasts, while the concentrations of Pb in most coasts were of higher risk. The heavy metal concentration of Cu, Zn, Cr and Pb at Lianyungang, Zn, Cr and Pb at Yancheng, Cu, Zn Cr, Pb and Ni at Nantong were below ERL, which represent a minimal-effects range, which is intended to estimate conditions where biological effects are rarely observed. For Cd concentrations at Lianyungang, Yancheng and Nantong are greater than ERL and more than ERM, which represents a range with in which represents the potential acute toxicity of contaminants and aprobable effect range within which adverse biological effects frequently occur. For Pb and Ni contaminant at Yancheng are greater than ERL and less than ERM, which represents a range with in which biological effects occur occasionally.

Abstract: Conventional PSA methods with a single adsorbent can result in an explosive CH4 concentration of 5 to 15%, making low concentration coal mine methane (LCCMM) or risky in terms of safety at a concentration of 30%. Proportion Pressure Swing Adsorption (PPSA) is a new and safer enrichment method suggested for LCCMM enrichment that uses a mixture of active carbon (AC) and carbon molecular sieves (CMS) as adsorbents. The effect of adsorption Pressure, adsorption time and bed length on the PPSA process were investigated to verify the feasibility of this method. The experiment results show that the methane concentration in desorption gas and the oxygen concentration in exhaust gas increased and decreased, respectively, with an increase in adsorption pressure or bed length. And the methane concentration in desorption gas is increased with the adsorption time expanding, but the recovery of methane is reduced. So the methane concentration in desorption gas can be increased to more than 30% and the oxygen concentration in exhaust gas be decrease to less than 12% by increasing the adsorption pressure or lengthening the bed.

Abstract: Based on Vanadium and Titanium iron concentrate pellets as raw material produced by direct reduction process of coal rotary hearth furnace in an enterprise, the paper studies the impact of magnetic separation process parameters on magnetic separation effect. The results shows that: the use of magnetic separation process can successfully separate metallized pellets, and obtain vanadium titanium micro-alloy iron powder and ti-enriched slag; suitable magnetic separation process parameters are: excitation current of 4A (magnetic field strength 2250Oe), particle size -200 mesh (-74μm), mine concentration of 1:3, iron recovery 92.5% TiO2 recovery up to 55.5%.

Abstract: We report on blue phosphorescent organic light-emitting diodes (PHOLEDs) with biphenyl (Spiro[fluorene-9,9′-xanthen]-2-yl) phosphine oxide（SFX2PO）host. The device studied in this work has the structure of ITO/m-MTDATA:MoOx(10nm)/m-MTDATA(30nm)/ TAPC(10nm)/SFX2PO: Firpic(10nm)/Bphen(40nm)/LiF(1nm)/Al(200nm), in which maximum luminance of 8950 cd/m2 and power efficiency of14.65 lm/w have been achieved.

Abstract: Fractionation of softwood BCTMP pulp fiber was carried out with a cylindrical hydrocyclone. Pulp fiber length characterization in different streams have been examined using FQA. The fiber length fraction density function f is calculated and the separation index H(L) is used to evaluate fiber fractionation performance for different streams, and its specific expression was formed, so the new index may be widely used in the study of the evaluation of the separation performance of the hydrocyclone.

Abstract: The effects of microwave treatment on the microstructure, oil yield of camellia seeds, and main physicochemical indexes, fatty acid composition of the oil were researched. The results showed that microwave treatment can improve the speed of extracting oil, and have a certain impact on the fatty acid composition and the quality of camellia seed oil.

Abstract: It is a key problem to fit curve and surface in many graphics and image computation programs. It is an NP-hard problem to obtain the estimation of the control parameters of NURBS (Non Uniform Rational B-Spline) for the result of fitted shape. Therefore, a modified ant colony optimization algorithm is used to estimate the weight and knot by minimizing the sum square error between the fitted and target curve and surface. The experiments results show that the optimization algorithm is a better opinion when a good initial location of vector is selected.

Abstract: Global estimation of modal parameters for dynamic Systems using fraction orthogonal polynomials possesses higher precision than the general rational fraction orthogonal polynomials algorithm. The object of this paper is to introduce a new technique to derive the global piecewise fitting method for modal parameter identification of dynamic Systems. Based on the global fraction orthogonal polynomials algorithm, a global piecewise fitting method for eliminating affections of modes outside of fitting bands is proposed. Both lower and higher modes outside of the fitting band are analyzed and processed. The frequency response data are revised by means of modes in two frequency bands close to the fitting band, and a curve fitting model is derived. The proposed method is compared with that of the traditional estimation without regard to the affections of modes outside of the fitting band. For this comparative study, simulated data are used. Simulation research indicates that the processed approach is effective.

Abstract: Large amount of sourrounding rocks in Jianshui China has been discarded for many years, and the “rock” is characterized by Cu-Fe polymetallic constituents and of low grade. According to the results of chemical and phase analysis as well as the mineralogy, a joint pocess of flotation and magnetic separation was proposed and used to process the ore. Flotation results show that the combined processing technology is efficient in utilizing the low grade rocks. A copper concentrate assaying 20.68% Cu at the recovery of 80.11% can be obtained, when the raw material assays 0.79% Cu.