Papers by Author: Li Xu

Abstract: The landslide process and mechanism of rainfall-induced landslides are assessed by using particle flow code in two dimension based on the discrete element method. The formation mechanism of rainfall-induced landslide is revealed by the analysis of displacement field, velocity field and stress of the slope versus time. The fluid velocity and porosity of sample increase gradually with the increase of water head, the violent fluctuation of contact number of movable particles show the violent motion of slope, then the slope maybe slide.

Abstract: In certain tank gun technical conditions integrated testing line, we firstly realize on line test of tank gun under non disassembly situation by using data acquisition card ----4472B produced in American NI Company. It realizes multiple data concurrent acquisition and processing and ensures the integral correlation of each testing data. The system adopts PXI main control platform and actualizes the technical conditions integrated test system of breechblock and recoil system based on Virtual Instrument technology. Through practical use, the result proves that the system has prominent character of integrated testing, online testing, visual data and convenient operation.

Abstract: Molybdenum-doped zinc oxide (MZO) films have been prepared by RF magnetron sputtering on glass substrates at room temperature. The structural, electrical and optical properties of the films vary with sputtering power from 15 W to 70 W are investigated. X-ray diffraction (XRD) analysis reveals that all the films are polycrystalline with the hexagonal structure and have a preferred orientation along the c axis perpendicular to the substrate. The resistivity increases with the increase of the RF power. The lowest resistivity achieved is 5.4×10^-3 Ω cm at a RF power of 15 W with a Hall mobility of 11 cm² V^-1 s^-1 and a carrier concentration of 1.1×10¹⁹ cm^-3. The average transmittance drops from 85% to 81% in the visible range and the optical band gap decreases from 3.26 eV to 3.19 eV with the increase of the RF power.

Abstract: In order to explore the effects of The Twelfth National Games of China (TNGC) on host city traffic, and improve efficiency of city traffic, we applied questionnaire survey and interview with local residents to acquire the change information of city traffic in Shenyang City. We analyzed city traffic conditions during preparatory period of TNGC, and change of urban traffic from TNGC including traffic road planning, running time of bus, subway construction, etc. Results indicated that TNGC has accelerated construction of transportation system. But there were still some problems, such as road construction leading to nearby residents inconvenience. Finally we puts forward some suggestions that before road were repaired, government tried to build a temporary, patency channel for residents in the vicinity.

Abstract: In order to analyze the relationship between urban construction land and economic development, and to know the similarities and differences of the relationship in different province in China, decoupling theory was introduced to analysis the relationship between construction land change and GDP growth. Research showed that, during 2003-2008, spatio-temporal difference was existed in every province in China about decoupling and coupling degree between construction land change and GDP changes. At the same time, there was also the leading type or major change trend. (1) During the 2003-2008, from the national scale, the interaction between construction change and GDP growth varied from weak decoupling state to the weak coupling condition. (2) Decoupling degree between construction change and GDP growth has a little difference in each provincial region in China, which showed majority continuous distribution in space. (3) Decoupling process between construction land and GDP growth may be turn into opposite direction, and the process was tortuous.

Abstract: Well-crystallized SrBi2Nb2O9 (SBN) thin films with good surface morphology were fabricated on quartz glass substrates by RF magnetron sputtering technique at a deposition temperature of 600°C under the O2/Ar(3:1) pressure of 2.4 Pa for 2 hour. The films exhibited bismuth-layered perovskite phase structure without pyrochlore phase and the ratio of Sr:Bi:Nb is about 1:1.92:1.98. The nonlinear optical properties of the films were determined by a single beam Z-scan technique at a wavelength of 532 nm with laser duration of 25 ps. The measured values of the real and imaginary parts of the third-order nonlinear optical susceptibility were 4.324×10-8esu and 1.278×10-8esu, respectively. The large nonlinear optical effect shows that the SrBi2Nb2O9 thin films have great potential application in designing nonlinear optical devices.