Lanzhou Resources and Environment Voc Technology College

Lanzhou, China

Lanzhou Resources and Environment Voc Technology College

Lanzhou, China
SEARCH FILTERS
Time filter
Source Type

Chen P.,Lanzhou Resources and Environment Voc Technology College
Agro Food Industry Hi-Tech | Year: 2017

With the rapid development of computer technology and the strengthening of the process of global integration, the communication barriers caused by the use of different languages become more and more prominent. Therefore, Machine Translation, a new discipline, has come into being. It involves many traditional disciplines, such as linguistics, mathematics and so on. And it is widely used in many fields, such as science and technology, business and politics. The principle of Simhash algorithm was studied in this paper. On the basis of this, the principle of fast retrieval of English sentences with Simhash was put forward. And the similar case retrieval system model was built.


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.


Wang V.,Xi'an University of Technology | You C.-Y.,Xi'an University of Science and Technology | He H.-P.,Lanzhou Resources and Environment Voc Technology College | Ma D.-M.,Xi'an University of Technology | And 2 more authors.
Journal of Magnetism and Magnetic Materials | Year: 2013

The roles of oxygen vacancies on the electronic and magnetic properties of Ni doped In2O3 have been studied by first-principles calculations based on hybrid functional theory. Our results predict that the Ni-doped In2O3 system displays a ferromagnetic semiconducting character. However, the presence of oxygen vacancies results in antiferromagnetic coupling between the neighboring Ni pair bridged by an oxygen vacancy. The antiferromagnetic coupling is found to arise from the predominant role of superexchange due to the strong Ni 3d-O 2p hybridization. Consequently, the oxygen vacancies play a key role in the lower saturation magnetization of Ni:In2O3 polycrystalline sample, as observed in experiments. © 2013 Elsevier B.V.


Wang V.,Tohoku University | Mizuseki H.,Tohoku University | He H.P.,Lanzhou Resources and Environment Voc Technology College | Chen G.,University of Jinan | And 2 more authors.
Computational Materials Science | Year: 2012

The hydrogen storage of Ca-decorated graphene is studied by using a recently developed van der Waals density functional [vdW-DF, M. Dion, et al., Phys. Rev. Lett. 92 (2004) 246401]. Our vdW-DF calculations show that Ca-decorated graphene with a coverage of 33.4% can only store 2.6 wt.% of hydrogen. vdW-DF significantly improves the underestimation (overestimation) of binding strength of Ca with graphene as well as the adsorption energies of H 2 molecules on Ca-decorated graphene with respect to the conventional local and semilocal approximations. © 2011 Elsevier B.V. All rights reserved.


Wang V.,Xi'an University of Technology | Liu R.-J.,Xi'an University of Technology | He H.-P.,Lanzhou Resources and Environment Voc Technology College | Yang C.-M.,Xi'an University of Technology | Ma L.,Xi'an 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.


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.


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.


Zhang J.,Lanzhou Resources and Environment Voc Technology College | Leng Y.,Lanzhou Resources and Environment Voc Technology College | Wang Y.,Northwest Normal University | Chen P.,Lanzhou Resources and Environment Voc Technology College
Indian Journal of Chemistry - Section A Inorganic, Physical, Theoretical and Analytical Chemistry | Year: 2014

Studies based on B3LYP and CCSD(T) have been carried out to investigate the mechanism of the reaction NO2(2A1) with CO(1∑ +) mediated by ScO+ on triplet and singlet electronic states. The natural population analysisand the frontier molecular orbitals analysis have also been used to discuss the structure of reactant-complexes. The O-atom affinities have been used to indicate the O transfer between NO 2 and CO, mediated by ScO+. Finally, the energetic span=model proposed by Kozuch has been applied to investigate the TOF-determining transition state and TOF-determining intermediate. The TOFs of the reaction NO2(2A1) with CO(1∑+) mediated by ScO+ on triplet and singlet electronic states are found to be 1.2×109 s-1 and 7.0×10-25 s-1 at 298 K respectively by the AUTOF program. In comparison with 1ScO+, 3ScO+ has better catalytic function for the title reaction at the 298 K.


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.


Shi N.-G.,Lanzhou Resources and Environment Voc Technology College | Zhang J.-H.,Lanzhou Resources and Environment Voc Technology College | Wang Y.-C.,Northwest Normal University
Computational and Theoretical Chemistry | Year: 2013

The mechanisms of the reactions between N2O and H2 in the gas phase catalyzed by PtOn+ (n=1, 2) have been investigated using UB3LYP and CCSD(T) levels of theory. The potential energy surfaces, crossing points and corresponding minimum energy crossing points have been explored. The involved possibility of spin inversion processes of 4/2MECPs are discussed by spin-orbit coupling (SOC) calculations, then the probability values of the quartet (P1ISC) and doublet (P2ISC) are estimated using the Landau-Zener-type model, respectively. The energetic span (δE) model coined by Kozuch was applied in this cycle to obtain some kinetic information. Furthermore, the TDTSs and TDIs were confirmed by the AUTOF program. The calculations showed that the δEs are 158.8 and 115.6kJmol-1, and the TOFs are 8.8×10-16 and 3.9×10-8s-1 for the title reaction catalyzed PtO+ and PtO2+ cations at 298K, respectively. To be compared with the PtO+, the PtO2+ has good catalytic function for the reaction of N2O+H2→N2+H2O in the gas phase at the standard temperature. © 2013.

Loading Lanzhou Resources and Environment Voc Technology College collaborators
Loading Lanzhou Resources and Environment Voc Technology College collaborators