Advanced Materials Research Vols. 335-336

Abstract: Although the financial crisis is seemly over, but its impact on the global economy is still spreading, and also make people pay more attention to the improvement and operation of the economic and financial system, the development of the logistics industry in this financial crisis has also been confronted with great challenge, in this case, the concept of logistics finance is more widely known by people. While logistics finance provides a good opportunity to the development of logistics industry, it also involves enormous risk. As the financial supervision system is incomplete, enterprise credit evaluation and supervision system is not perfected, risks of the logistics enterprises participate in the logistics finance are more obvious, and researches of this aspect will appear more valuable. Therefore, this paper established a game theory tripartite game model of logistics financial participants, on the base, risks of logistics enterprises participate in the logistics financial business were analyzed, and show the corresponding conclusions and recommendations.

Abstract: Theoretical studies on mechanism of mutual conversion between σ-complexes and the solvent effect in ring-chlorination of toluene were performed with density functional theory (DFT). All geometry optimizations, intrinsic reaction coordinate calculations and frequency analyses were carried out at B3LYP/6-311G** level. Calculation results indicate that ortho-, meta- and para-complexes can convert mutually by overcoming a π-complex structured transition state. It was also confirmed that the mutual conversion between ortho- and para- complexes can occur directly which give answer to the experimental result that ortho-chlorotoluene (OCT) and para- chlorotoluene (PCT) are predominant products while meta-chlorotoluene (MCT) shares less than one percent in total products. In addition, a theoretical investigation of solvent effect was carried out at the same level via Onsager model, where all stagnation points were optimized completely using toluene as solvent. The free energies and activating free energies were also calculated at the same level, which decrease due to solvent effect, suggesting that it is better for toluene to be ring-chlorinated in liquid phase than in gas phase, which is in agreement with experimental results.

Abstract: In the system of Ce(NO₃)₃·6H₂O and urea solution during homogeneous precipitation method, hydrothermal homogeneous precipitation coupling method and homogeneous precipitation method with additive, X-ray diffraction (XRD) and transmission electron microscope (TEM) were used to study and characterize the product structures and morphologies. The outer electron configurations and the energy conservation theory were used to analyze the reasons for stability of products and valence state change of cerium ions. The results showed that synthesis technics and additives had a great effect on the cerium ion compound valence. The products were orthorhombic Ce₂O(CO₃)₂·H₂O with Valence Ш and orthorhombic CeO(CO₃)₂·H₂O with valence Ⅵ by using homogeneous precipitation method and hydrothermal homogeneous precipitation coupling method, respectively. If an additive (triethanolamine or triethylamine) was added into the homogeneous precipitation system, the products changed into a mixture of orthorhombic CeO(CO₃)₂·H₂O with Valence Ⅵ and cubic CeO₂ with valence Ⅳ. It showed that triethanolamine or triethylamine had strong oxidizing properties and played a catalyst role in the reaction.

Abstract: The equilibrium crystal structure, band structure, density of states, bulk modulus and its first pressure derivate of CdTe are systemically calculated by first-principles plane-wave pseudo-potential method, and then compared with experimental results. Applying the vibrational Debye-like model, complete sets of isochoric heat capacities can be obtained up to 1000K at pressure or not. With the temperature increasing from 0 to 1000K, a sharp increase in the heat capacity is observed. Moreover, the dependences between cell volume and pressure are also successfully obtained. Our calculated results are in agreement with available results.

Abstract: The dyeing properties of acetylated fir powder and acetylated poplar spill with 8 red disperse dyes were studied in this paper. The dyeing results indicate that the percentage of dye exhaustion (% E)on acetylated fir powder is 96~99%. As for acetylated poplar spill, the percentage of dye exhaustion reaches 58~78%. The color shade of dyed modified wood is similar to that of dyed polyester fabric. Compared with the dyed polyester fabric, the color difference(∆E) of dyed modified wood is smaller than that of dyed unmodified wood under the same dyeing conditions. Furthermore, modified fir powder has excellent color fastness to washing, the dye removal of dyed acetylated fir powder is 0.4 ~ 1.8 % at 80°C for 2 h in the water. Both the Infrared (IR) spectra and microscopic images of fir powder, acetylated fir powder and dyed acetylated fir powder were investigated.

Abstract: TiO₂ and Ag⁺-doped TiO₂ thin films were successfully obtained on microscope glass slides by means of sol-gel method. Then the photocatalytic activity of the TiO₂ and Ag⁺-doped TiO₂ thin films was evaluated by the degradation of rhodamine B dye solution. The effects of both annealing temperatures and Ag⁺ contents on the photocatalytic activity of TiO₂ thin films were examined. The results indicated that the TiO₂ thin films with an atomic ratio of Ti:Ag=10:1 annealed at 300°C had a higher photocatalytic activity.

Abstract: In this paper, we used spectrophotometric measurement to get the reflectance values of experimental samples and discussed relation between the reflectivity and the moisture content. By measured curves of reflectivity and the wavelength of 47 samples from 0 to 30 minutes we had found that the reflectance difference was the largest when the wavelength in the 600-700nm wavelength,it could help us to distinguish dynamic surface moisture performance at different time points, so, the paper had selected the reflectivity in wavelength 650nm as the feature value. Using the reflectance had established the linear model of moisture content, the results showed that: R² value of the determination coefficient of the linear regression model is 0.9979, almost close to 1, it had indicated that the reflectivity as the feature value could be used to predict fabric moisture content.

Abstract: The polyoxometalate complexes of ciprofloxacin with H_nXW₁₂O₄₀ (X=B, Si, P) were prepared from ciprofloxacin hydrochloride and H_nXW₁₂O₄₀·nH₂O (X=B, Si, P) in aqueous solution, and characterized by elemental analysis, IR spectra and TG-DTA. The IR spectrum confirmed the presence of Keggin-type anion of heteropoly acids and the characteristic functional group of ciprofloxacin after the polyoxometalate complexes are formed. The TG/DTA curves showed that their thermal decomposition was a more-steps process consisting of simultaneous processes involving also Keggin anion. The residue of decomposition is a mixture of WO₃ and B₂O₃, SiO₂ or P₂O₅, confirmed by X-ray diffraction and IR spectroscopy. And the possible thermal decomposition mechanisms of the complexes are proposed.

Abstract: SiC MIS structure with ultra-thin Al₂O₃ as gate dielectric deposited by Atomic Layer Deposition(ALD) on epitaxial layer of 4H-SiC(0001)8⁰N-/N+ substrate is fabricated. The experimental results indicate that the prepared ultra Al₂O₃ gate dielectric exhibits good physical and electrical characteristics, including a high breakdown electrical field of 25MV/cm, excellent interface properties(2×10¹³cm^-2•eV^-1) and low gate-leakage current (I_G=1×10^-3A/㎝-²@EOX=8MV/cm). Analysis of current conduction mechanism in deposited Al₂O₃ gate dielectric has also been systematically performed. The confirmed conduction mechanisms consisted of FP emission, FN tunneling, DT and Schottky emission. And the dominance of these current conduction mechanisms depended on applied electrical field, When the gate leakage current mechanism is dominated by FN tunneling, the barrier height of SiC/Al₂O₃ is 1.4eV, which can meet the requirement of SiC MISFET devices.

Abstract: Fluorene-based poly(imino ketone)s (PIKF) were designed and synthesized by reacting 1,4-Bis-(4-bromobenzoyl)-benzene and 9,9-bis(3-R-4-aminophenyl)fluorine (R: H, CH₃ or F). The structures of the resulting polymers were characterized by FT-IR, 1H NMR spectroscopy and elemental analysis. The thermo and optical properties of PIKF were evaluated. Good solubility of PIKF in ordinary organic solvents such as THF and chloroform was confirmed. PIKF were amorphous at room temperature. No phase transition except for Tg was confirmed in the DSC analysis. PIKF displayed a high glass transition temperature (Tg > 215 °C) in comparison with commercially available poly(ether ether ketone) (PEEK Tg = 169 °C). The UV-vis absorption spectrum of polymers exhibited two absorption peaks around 271 nm and 369 nm; The fluorescence spectrum of the PIKF-1, 2 and PIKF-3 showed a maximum emission wavelength at 502 nm and 491 nm, respectively. These optical properties were probably related to the cardo structure of the fluorene moiety placed on the main chain.