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Ma Q.,Lanzhou Resources and Environment Voc Technology College | Xie D.,Performance Technology
Advanced Materials Research | Year: 2014

This paper proposed the measuring device for the casting powder crystallization and the crystalline proportion test by the double thermocouple. The two different dual platinum-rhodium thermocouple wires are acted as heating element and temperature measurer at the same time, so that, the temperature of both wires apart can be controlled accurately. Adjusting the two wires' distance discretionarily, the crystalline state can be observed under the different range of temperature of flux film on the both sides. The fast temperature raising and high efficiency of metering technology is designed for the measurement device and achieved great sense to research the casting powder characters in the crystallizer. © (2014) Trans Tech Publications, Switzerland. Source


Wang G.,Lanzhou Jiaotong University | Tian M.,Lanzhou Jiaotong University | Ren E.,Lanzhou Jiaotong University | Wei Y.,Lanzhou Resources and Environment Voc Technology College
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011

Fuzzy objective function optimization is proposed and applied to the output filter configuration for the integrated active compensation equipment of electric railroads to suppress the higher-order harmonics pollution. The simplified model of LC output filter is established. It is put forward to improve the normal LC output filter by connecting in series to the filter capacity a parallel circuit of resistor and inductor. With the satisfaction as the integrated index, the fuzzy objective function is established and the weighted multi-objective optimization is applied to obtain the optimized LC parameters. Simulative analysis verifies the correctness and feasibility of the proposed improved algorithm and model. Source


Wang V.,Xian University of Technology | Liu R.-J.,Xian University of Technology | He H.-P.,Lanzhou Resources and Environment Voc Technology College | Yang C.-M.,Xian University of Technology | Ma L.,Xian University of Technology
Solid State Communications | Year: 2014

The formation energies and transition energy levels of native defects in hexagonal BN have been studied by first-principles calculations based on hybrid density functional theory (DFT) together with an empirical dispersion correction of Grimme's DFT-D2 method. Our calculated results predict that the interstitial B is the most stable defect under N-rich and p-type conditions. While the B vacancy and interstitial N become the dominate defects when the electron chemical potential is near the conduction band maximum of host. Nevertheless, these compensating defects would be inactive due to their ultra deep ionization levels under both p- and n-type conditions. © 2013 Elsevier Ltd. Source


Tong Y.-C.,Hexi University | Zhang J.-H.,Lanzhou Resources and Environment Voc Technology College | Jia R.-Y.,Longnan Teachers College | Wang Y.-C.,Northwest Normal University | Wang Q.-Y.,Hexi University
Journal of Molecular Structure: THEOCHEM | Year: 2010

The mechanism of the reaction of NO2(2A1) + CO(1Σ+) → NO(2Π) + CO2(1 Σg +) mediated by V+ has been investigated by means of DFT-UB3LYP/6-311+G(2d) level of theory. The potential energy surfaces (PESs) of [NO2, V]+ and [VO, CO]+ were explored in detail in singlet and triplet with doublet and quartet electronic states. The electron-transfer reactivity of the reaction was analyzed using the two-state model, and the strongly crossing behavior on the transition state (TS) area was shown. Finally, the actions of frontier molecular orbitals in CPs have been illuminated briefly. These theoretical results can act as a guide to further theoretical and experimental researches. Crown Copyright © 2009. Source


Zhao Y.,Sichuan University | Su B.,Sichuan University | Zhong L.,Lanzhou Resources and Environment Voc Technology College | Chen F.,Sichuan University | Fu Q.,Sichuan University
Industrial and Engineering Chemistry Research | Year: 2014

In this work, a poly(styrene-b-isoprene-b-styrene) thermoplastic elastomer was processed via a novel processing technique, dynamic-packing injection molding (DPIM). The shear cessation time is variable during DPIM, and a conventional injection-molded sample (C-sample) was prepared for comparison. For the dynamic-packing injection-molded sample (D-sample) with a short cessation time, a high Youngs modulus was obtained but with no significant enhancement of the break strength relative to the C-sample. However, a significant improvement of the break strength was achieved for the D-sample with longer cessation time. The mechanical performance of both the C-sample and D-samples was interpreted from the contribution of polyisoprene (PI, as the matrix) and polystyrene (PS, as a dispersed phase) segments. It is proposed that a short cessation time (strong shear) can induce the formation of a stretched PI network, while prolonged cessation time (more relaxation) could result in the segregation of PS and PI microdomains and the formation of a perfect parallel orientation of the PS cylinder in a hexagonal lattice. © 2014 American Chemical Society. Source

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