Advanced Materials Research Vol. 709

Abstract: In order to analyze the creep properties of UHMWPE multifilament and aramid multifilament, four-element model and Matlab software were used to get creep fitting curve, the corresponding mechanical fitting equation and microscopic parameters. The creep properties of the two kinds of multifilament were discussed by microscopic parameters. At the same time, the tensile and relaxation performance of UHMWPE multifilament and aramid filament were studied. Compared with aramid multifilament, UHMWPE multifilament has higher strength, better elongation, lower creep resistance and obvious the phenomenon of stress relaxation. This article will provide some basic performance reference to the application of UHMWPE multifilament.

Abstract: In the presence of polyethylene glycol (PEG2W),bimodal mesoporous γ-Al₂O₃ was successfully synthesized via hydrothermal method. The samples were respectively characterized by X-ray diffraction (XRD), N₂ physisorption, transmission electron microscopy (TEM), thermogravimetric and differential scanning calorimeter (TG-DSC). Introduction of PEG2W can increase the relative crystallinity of AACH and γ-Al₂O₃. The BET surface area and pore volume of alumina shows an increasing trend with increasing of PEG2W content, while the pore size shows an opposite tendency. The PEG2W also plays an important role in inducing the formation of the nanorod-like alumina.

Abstract: t is that Ni/C composite powder are prepared by electroless plating with hydrazine hydrate as a reducing agent and compound complex agent.To investigate the effect of main salts, reductant dosage, graphite dose and compound complex agent ratio on the conductivity of composite powder.It is can be obtained under optimum conditions with good electrical properties , the rough surface is completely coated Ni / C composite powder.

Abstract: Removed due to plagiarism. The original was published as follows: Lors, C., Martínez Aldaya, M., Salmon, S., Ponge, J.F., 2006. Use of anavoidance test for the assessment of microbial degradation of PAHs. SoilBiology and Biochemistry 38:2199-2204www.elsevier.com/locate/soilbio

Abstract: Cobalt and/or manganese incorporated berlinites (CoMnAPO₄) and aluminophosphate molecule sieve (CoMnAPO-5) were hydrothermally synthesized, characterized by XRD, FT-IR, XPS and SEM, and employed as catalysts in the oxidation of cyclohexane with molecular oxygen at 348 K under atmospheric pressure. It was found that the berlinite-based catalysts were more selective for the production of KA oil, stable during the reaction, but slightly less active for the conversion of cyclohexane, when compared to their molecular sieve counterparts. The CoMnAPO₄ exhibited a better catalytic performance, due to a synergic effect, than the CoAPO₄ or MnAPO₄.

Abstract: A layered structure of different iron oxides was produced by thermal oxidation of iron. The structure and microstructure of different layers were examined using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Selected area electron diffraction (SAED) was used to identify the structures of the different oxide layers. Two different structures of Fe₂O₃ were found to co-exist. Based on our observation, a possible oxidation mechanism for iron was proposed. The results shed light on the oxidation process of metals and provide insight into the synthesis of iron oxides.

Abstract: The viscoelastic surfactant diverting-acidification technology is a new intelligent matrix acidizing technology.Based on the theoretical analysis，viscosity-variable diverting-acid main agent is selected out.Both the rthogonal design and the grey relational analysis are used to determine synthesis conditions and influence of reaction factors.The production structure is verified by the infrared spectra.Then coreflooding experiments are designed to check the diversion effect,and it shows that the system satisfies the need of diverting-acidification in the carbonate formation.

Abstract: The high-density Li_0.95Na_0.05FePO₄ cathode material was synthesized through microwave heating, using a spherical sample prepared by co-precipitation method as precursor. The morphology, structure, electrochemical performance and the tap density of the materials were characterized by scanning electron microscope (SEM), x-ray diffraction (XRD), cyclic voltammetry (CV), constant current charge-discharge experiment and the tap density measurement. The results indicated that the samples have rules spherical or similar spherical morphology and simple pure olive-type phase. The Na doped Li_0.95Na_0.05FePO₄ material showed excellent performance with a tap density of 1.63g/cm³. At room temperature, its initial discharge capacities reached 164.2 mAh/g, 151.5mAh/g, 130.5mAh/g at 0.2C, 1C, 2C current rates, respectively.

Abstract: Engineered cementitious composites (ECC) are characterized by strain hardening and tight crack width control. Good fiber distribution can maximize fiber contribution. Processing can substantially influence fiber distribution, and consequently influence mechanical performance. Combined with the latest research results, this review summarizes the results of several studies in which the influence of processing on fiber distribution and mechanical performance was investigated. Based on the reviewed methods it is argued that the processing technique of producing ECC can improve fiber distribution.

Abstract: Surface roughness of ceramic coatings are effected on grinding wheel grain size, bond type and grinding wheel surface roughness. Surface roughness increases with the increase of grinding depth and workpiece speed, and it decreases with the increase of wheel speed. grinding smoothly can reduce the surface roughness.