Advanced Materials Research Vols. 512-515

Abstract: Cu₂FeSnS₄ semiconductor nanocrystals with zincblende structure have been successfully synthesized by a hot-injection approach. Cu⁺, Fe²⁺, and Sn⁴⁺ cations have a random distribution in the zincblende unit cell, and the occupancy possibilities are 1/2, 1/4 and 1/4, respectively. Those nanocrystals were characterized by means of X-ray diffraction (XRD), transmission electron microscopy (TEM), selected area electron diffraction (SAED), energy dispersive spectroscopy (EDS), and UV-Vis-NIR absorption spectroscopy. The Cu2FeSnS4 nanocrystals have an average size of 7.5 nm and a band gap of 0.92 eV.

Abstract: Magnetic Polyurethane is synthesized by prepolymerization body method using PBA 2000, MDI, 1-4 butyl glycol and magnetic chain extender, which is synthesized by a method involving the use of dimethylol propionic acid (DMPA) and ferrous powder in dimethylformamide as solvent conditions. The mechanical property of magnetic polyurethane is measured by servo control computer system tension tester,Shore hardness of magnetic polyurethane is measured by LX-A type Shore rubber hardness tester.

Abstract: A series of Li[Ni _0.8 Co _0.1 Mn _0.1]O₂ were synthesized with different [Ni _0.8 Co _0.1 Mn _0.1](OH)₂ as precursors. Because the precursors were obtained via hydrothermal method at solutions with different ratios of ethanol and distilled water, they present different morphology in details. This phenomenon were inherited by the Li[Ni0.8Co0.1Mn0.1]O₂. In addition, as-synthesized materials Li[Ni _0.8 Co _0.1 Mn _0.1]O₂ perform distinct electrochemical properties as cathode materials in lithium-ion battery. The results indicate that more ethanol used in this work is effective to modify the surface structure of materials leading to better electrochemical properties. In addition, more ethanol in synthesis process could also improve the density of samples.

Abstract: A fixed-bed experimental apparatus with the capacity of 1kg coal was set up for coal pyrolysis by solid heat carrier. Shenmu bituminous coal and quartz sand was used as raw material and solid heat carrier respectively. The effects of initial temperature of solid heat carrier, reaction time and blending ratio on the yield of gas and tar were examined at different conditions. The results showed that tar yield was above 10 wt% when the initial temperature of solid heat carrier more than 800oC, reaction time and blend ratio had lesser influence on gas and tar yield. At the investigated test condition, smaller coal particle leads to an inconspicuous increase on gas and tar yield. The characteristic of gas and tar products was also investigated in this paper.

Abstract: In order to improve the scientificity and rationality of life evaluation of internal coating on in-service natural gas pipeline, the evaluation model of life evaluation of internal coating based on fuzzy theory is proposed. The model transforms the fuzzy appraisal of zone index to the overall fuzzy appraisal by fuzzy evaluation, and the final evaluation score can be computed combined with comment set. The model structure and concrete steps have been clarified in this paper, and applied to the life evaluation of resistance-reducing internal coating of five-year-old in-service natural gas pipeline, the application results indicated that it is feasible and has the widespread serviceability.

Abstract: The paper investigates the molding process of producing formed coke with low rank pulverized coal. When the bentonite as binder, the technological conditions mainly including bentonite content, forming pressure, forming moisture and particle size factors which effect on the strength of formed cokes were systematically discussed and obtained the optimal conditions. Under the conditions of amount of bentonite 5%, forming pressure 40kN, moisture content 14%, and fine coal particle size<5mm the formed coke with strength of 600N/ball was prepared and it satisfied the standard of gasification behavior of formed coke.

Abstract: The paper sets up the Finite Element Model on the basis of crankshaft fillet rolling experiment and its mechanism. And then the paper shows the distribution of the residual stress in different depths of rolled crankshaft fillet through numerical simulation. It is found that the fatigue strength can greatly be produced by the method of the engine crankshaft fillet rolling in most of fillet areas; Simultaneously, two strips of tensile stress which is related to reduce the crankshaft fatigue strength will be generated in the peripheries. The tensile stress strips only emerge in the surface layer of the fillet, and then mainly disappear in the depths of 0.4mm below the surface layer. The paper concludes that the main reason of strips of tensile stress lies on the transition between the deformed region and the non-deformed reformed region after trolley wheel pressure is imposed on through a further research.

Abstract: Fabric re-creation refers to processing and transforming the original fabric as semi-finished products with a variety of craft techniques. Fabric re-creation involves remodeling the structure of the fabric through deconstruction, reorganization and deformation techniques. This paper expounds 6 expression techniques of fabric re-creation and 2 different designing process of fabric re-creation. Designers should carefully deal with the coordination of color relationships and clothing style.

Abstract: The effect of TiO₂ on the formation of desulfurization product calcium sulphoaluminate is investigated by flue gas analysis, X-ray diffraction, and differential scanning calorimetry. The results show that TiO₂ is a better desulfurizing additive. It reduces the SO₂ emission, increases the desulfurization degree, reduces the formation temperature of calcium sulphoaluminate, strengthens the formation of calcium sulphoaluminate, and increases the chemical stability of calcium sulphoaluminate. The desulfurization efficiency reaches the best when the addition of TiO₂ is up to 1.0wt. %.

Abstract: The electron affinities of the CnH2n+1SS/CnH2n+1SS- (n=1-5) species have been determined using four different density functional or hybrid Hartree-Fock density functional methods. The basis set used in this work is of double- plus polarization quality with additional diffuse s- and p-type functions, denoted DZP++. Three different types of the neutral-anion energy separations reported in this work are the adiabatic electron affinity (EAad), the vertical electron affinity (EAvert), and the vertical detachment energy (VDE). The most reliable adiabatic electron affinities, obtained at the DZP++ BP86 level of theory, are 1.794 eV (for CH3SS), 1.777 eV (for C2H5SS), 1.778 eV (a) and 1.809 eV (b) for the two isomers of C3H7SS, 1.782 eV (a), 1.825 eV (b) and 1.778 eV (c) for the three isomers of C4H9SS, and 1.784 eV (a), 1.875 eV (b), 1.805 eV (c) and 1.835 eV (d) for the three isomers of C5H11SS, respectively.