Advanced Materials Research Vol. 529

Abstract: A new method for preparing Acid pink 3B fluorescent magnetic powder was proposed based on theorthogonal theory and currentpreparing experience experiments of fingerprints development. The method contains two steps, first the level of each facor should be determined by the single factor expermint, then the best matrix of Acid pink 3B fluorescent magnetic powder should be selected by the orthogonal design theory.

Abstract: In order to improve mechanical properties of polyurethane, hyperbranched interpenetrating network(H-IPN) was achieved by incorporating hyperbranched polyethrs into polyether-Urethane that derived from hydroxyl terminated ethylene oxide tetrahydrofuran copolyether (PET) and isophorone diisocyanate (IPDI). It was found that H-IPN exhibited dual-phase morphology, and hydrogen bonding was formed between hyperbranch polyether and polyether-Urethane. H-IPN shows synergetic effect, the tensile strength of H-IPN increased from 1.39MPa of neat polyether-Urethane to 2.67 MPa; Meanwhile, the elongation increased from 605% of control sample to 2304%.

Abstract: In this study, a amphiphilic copolymer, poly ((N-isopropylacrylamide)-co-acrylamide-co- (octadecylacrylate)-co-(Falate-(polyethyleneglycol)-(acrylicacid)))(P(NIPA-co-AAm-co-ODA-co-FPA)) micelles was synthesized by free radical random copolymerization. The obtained amphiphilic copolymers were self-assembled into micelles, which exhibited thermally sensitivity. LCST of the micelles was detected by uv-vis spectrophotometer. The diameter and morphology of micelles were determined by laser particle size analyzer (LPSA) and transmittance electron microscope (TEM), respectively. The micelle with a diameter of 60 nm and LCST of 40 oC was obtained by utilizing of ODA and the feed ratio of NIPA and AAm, respectively, which is satisfied for drug delivery in living body. The maximum DLC was achieved with the amount of ODA (180mg).

Abstract: In this paper, the main factors that affect the displacement efficiency were experimental studied by means of the physical cylinder model filled with sand, based on the high efficiency of oil displacing water in the process of hydrocarbon accumulation. After eliminating of some factors that affect displacement efficiency, such as viscosity ratio, wettability and reservoir heterogeneity and so on, the research founds that the crude oil unit connectivity, that is continuity of displaced phase, has a significant impact on the displacement efficiency. The experimental results show that the crude oil unit connectivity is more than wettability, and not less than viscosity, as the factors of the impact of displacement efficiency. If the crude oil unit connectivity is serious damaged, even if the wettability of reservoir rocks was changed by improving the viscosity of injected water, its effect of enhanced oil recovery should not be obvious. In fact, this is main reason that the effect of current the EOR method such as polymer flooding, surfactant flooding and stuff was not obvious. It is expected that the research results will be useful in the displacement efficiency of waterflooding that is controlled by the crude oil unit connectivity.

Abstract: To study the spectrum of magnesium plasma, the escape factors and transition probabilities of two resonance absorption lines that making up the MgⅡ280nm line are discussed theoretically, for both Gaussian profile and Lorentzian profile. The oscillator strength, the number density of the absorbing atoms in the ground state, and the optical depth in the line center are discussed also. The results we calculated are in good agreement with the exerimental results, and some useful conclusions are drawn. This calculation will be significant in the research of plasma spectrum of magnesium plasma.

Abstract: Hollow fiber composite nanofiltration (NF) membranes were prepared by interfacial polymerization method, with polysulfone (PSF) hollow fiber ultrafiltration membrane as base membrane, piperazine (PIP) as the aqueous phase monomer and trimesoyl chloride (TMC) as the organic phase monomer. The effects of aqueous phase composition on composite NF were discussed. The experimental results show that the optimum compositions in aqueous phase: 1wt% PIP, 0.05wt% MPDA, 1wt% TEA, 3wt% sulfamic acid. The best rejection to MgSO4 was 94.7%, and water flux was 66.1L•m-2•h-1.

Abstract: Semiconductive nanoscale TiO₂ has a Wide range of application, its photocatalysis characteristics and applications have been paid close attention. Nanoscale TiO₂ is an efficient photocatalyst, which is always used to decompose pollutant without secondary pollution in environmental domain. The basic properties and main preparation methods of nanoscale TiO₂ have been reviewed briefly. The analysis of the photocatalytic mechanism of nanoscale TiO₂ as well as its applications in pollution control was reviewed. And some elementary solutions to existing problems in photocatalysis of nanoscale TiO₂ have also been put forward.

Abstract: A new kind of sorbent, Oxidized Nano Carbon Black (OCB), was prepared with the acid potassium permanganate. The adsorption kinetics,isotherms of Cu (II) and Cd (II) onto Nano Carbon Black(CB) and Oxidized Nano Carbon Black(OCB) were investigated. The experimental data were analyzed by Langmuir, Freundlich isotherm, Pseudo first order equation and Pseudo second order equation. The results demonstrated that the Langmuir isotherm provided a better fit to the experimental data of CB and the OBC fitted well into Freundlich adsorption isotherm. The adsorption capacity of Cu2+ and Cd2+onto oxidized Carbon black was significantly enhanced after modification. The maximum amount of CB was 16.129mg/g for Cu2+, 5.747mg/g for Cd2+, the maximum amount of OCB was 83.333mg/g for Cu2+, 10.3097mg/g for Cd2+, respectively. The Freundlich parameters of OCB were KF, Cu = 0.360, nCu = 1.16, KF, Cd = 1.777 and nCd = 3.086. The values of n > 1 indicated a favorable adsorption process. The study of adsorption kinetic showed that the adsorption stage of Cu and Cd onto sorbents could be divided into two stages: fast reaction and slow reaction. The adsorption kinetic model of metal on OCB followed pseudo second order model well (RCu2=0.985, RCd2=0.987) and the data of CB fitted pseudo first order model well (RCu2=0.983, RCd2=0.998).

Abstract: Gibbs sampler is widely used in Bayesian analysis. But it is often difficult to sample from the full conditional distribution, and this hardly weakens the efficiency of Gibbs sampler. In this paper, we propose to use mixture normal distribution for Gibbs sampler. The mixture normal distribution can approximate the target distribution. So carrying more information from target distribution, the mixture normal distribution tremendously improves the efficiency of Gibbs sampler. Further more, combining with mixture normal method, Hit-and-Run algorithm can also get more efficient sampling results. Simulation results show that Gibbs sampler with mixture normal distribution outperforms other sampling algorithms. The Gibbs sampler with mixture normal distribution can also be applied to explorer the surface of single crystal.

Abstract: The crystal structure, Curie temperatures, spin reorientation temperature, magnetocrystalline anisotropy constant and magnetostriction of TbDyHoFe1.95 alloys with composition formulation (1-y)Tb0.36Dy0.64Fe1.95+yTb0.20Dy0.22Ho0.58Fe1.95 (0≤y≤1) were investigated. X-ray diffraction patterns demonstrate the TbDyHoFe1.95 alloys possess MgCu2-type cubic Laves structure. The Curie temperature Tc decreases slightly from 381 °C for Tb0.36Dy0.64Fe2 to 379 °C for y=0.3, 375°C for y=0.4 and 373°C for y=0.5. The spin reorientation temperature Tr increases from -94 oC for Tb0.36Dy0.64Fe2 to -70°C for y=0.3 and -51oC for y=0.5. The magnetocrystalline anisotropy constant K1 decreases with increasing y value. The magnetostriction was examined under applied magnetic field H (0