Advanced Materials Research Vol. 496

Abstract: A mixture of expanded graphite and iron powders was ball-milled in a high-energy mill under an air atmosphere. The milled powders were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD). The anti-friction effect of the powders used as lubricating additive was investigated by a tribo-tester. Results show that the powders have an obvious anti-friction effect, and the effect is associated with the crystallization degree of the milled expanded graphite depending on the milling time, the higher the crystallization degree, the higher the anti-friction effect

Abstract: A photoelectrochemical biofuel cell (PEBFC) generating electrical energy directly from sunlight and biomass was investigated. In this paper, the PEBFC had a natural chlorophyll-sensitized titanium dioxide (TiO2) film photoanode and Pt black cathode. The electron transport process of the PEBFC was described. The performances of the PEBFC were obtained by photocurrent-photovoltage characteristic curves. The open-circuit photovoltage (Voc), the short-circuit photocurrent (Isc) and the maximum power density (Pmax) is 0.53V, 1.000 μAcm-2 and1.1520 μWcm-2 at 0.37 V, respectively. The incident photo-to-current efficiency (IPCE) is 8.4% at 380 nm.

Abstract: In order to utilize the high As-containing pyrite concentrate in Datun concentrator, SW China, flotation tests has been conducted by applying the inorganic depressants to produce a marketable product. By means of orthogonal experimental design, the optimized levels and main factors have been found for the roughing stage in flotation. Through selection of the effective inorganic depressants for arsenopyrites in flotation system, the main As-containing mineral (arsenopyrite) can be effectively depressed and separated from the said pyrite concentrate, containing 33.1% S, and only 0.48 % As by one-stage roughing and two-stage cleaning flotation operations

Abstract: The extraction process of cobalt using microemulsion system saponified with P204 as extracting agent was studied. The influence of initial concentration, the concentration of P204, initial pH, the extracting time and the concentration of cobalt and nickel on extraction coefficient were also studied. Experimental results show that the saponification microemulsion system using P204 as extractant is thermodynamic stable, and it can separate cobalt better. The optimum conditions were achieved as: the initial concentration is 0.05 mol/L, pH is 2; The concentration of P204 is 10%, extraction time is 10 min; The volume ratio of organic phase to water phase is 2:1.

Abstract: Supported emulsion liquid membrane using copper(Ⅱ) N-dodecyl-(L)- hydroxyproline as a chiral carrier was used as a novel technique to extract L-theanine. The effects of initial concentration of L-theanine in the feed phase, chiral carrier concentration in the membrane phase and salt concentration in receiving phase on extraction performance were studied and some optimum conditions were achieved.

Abstract: The separation process of cobalt and nickel using microemulsion system saponified with P204 as extracting agent was studied. The influence of initial concentration, the concentration of P204, initial pH, the extracting time and the concentration of cobalt and nickel on separation coefficient were also studied. Experimental results show that the saponification microemulsion system using P204 as extractant is thermodynamic stable, and it can separate cobalt and nickel better. The optimum conditions were achieved as: the initial concentration is 0.05 mol/L, pH is 2, the concentration of P204 is 8%, extraction time is 10 minutes, the volume ratio of organic phase to water phase is 2:1.

Abstract: The oxidation of noradrenaline (NA) using copper phthalocyanine (CuPc) as catalyst was investigated by UV-Vis spectroscopic analysis. The influence factors of catalytic efficiency, such as catalytic time and temperature, the pH value of solution and the amount of CuPc, have been investigated. The results indicated that NA could be effectively catalyzed by CuPc and the product was trihydroxyl-indole

Abstract: The conventional prediction model of rock drillability is based on regression analysis using well logging data. Regression analysis directly uses initial data to establish model, so its precision is not satisfied. By accumulating initial data, gray theory model (GM (0,N)) is able to weaken the random of initial data. Therefore, a practical approach to calculate the rock drillability, which base on GM(0,N) using well logging data, is presented in this paper. Based on the inherent relation of well logging information and rock drillability, a lot of logging parameters are selected closely to rock drillability, and the prediction model of rock drillability are established by GM(0,N). This method is applied to logging data process of Du4 well in SC oil field, the results show that it can improve predicting accuracy of rock drillability, and can easily frame rock drillability profile in some areas.

Abstract: By now, it is hard for an effective determination of the engine abnormal sound according to the existing auscultation method based on human experiences and diagnosis aided by instruments. For this reason, the author presented an innovative method that was by the using of atomic absorption spectroscopy technology for a rapid determination of the engine crankshaft bearing abnormal sounds. Major metals contents (Cu and Pb) in 20 batches of Audi A6 engine lubricating oil were detected by atomic absorption spectrometry. Samples were taken from the oil of mileages from 5000km to 69000km and 3000km intervals. Then the databases of main metal contents of different driving miles were built within the same vehicle type. This study showed that the main metal contents were fluctuating with the increasing of driving miles within certain range. For the practical application, we built a connection between engine abnormal sound faults and the major metal contents in the engine lubricating oil. By comparing the metal contents in problem engine with the established contents changing trends chart, we could get a rapid determination about the engine abnormal sound fault without disintegration of the car. To sum up, the achievements of this study helped to reduce vehicle maintenance costs and improved the fault diagnosis accuracy in abnormal sound of engine crankshaft bearing.

Abstract: To research basic property of milk protein fibre, basic property of milk protein fiber and wool were tested and analysed. Through analysing and contrasting each property it is considered that in dry state the strength of milk protein fiber is close to the soybean protein fiber and bigger than wool, the dynamic and static friction coefficient of milk protein fiber is bigger than that of soybean protein fiber. Crimpability of milk protein fiber is worse than that of wool.