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Xu G.,Xian Technological University | Gu Z.,North Western Polytechnical University of China | Wei S.-M.,Xian Technological University
Gongneng Cailiao yu Qijian Xuebao/Journal of Functional Materials and Devices | Year: 2012

In order to improve the orientated growth of HgI2 films in vapor, iso-epitaxy layers of poly-crystalline mercuric iodide were deposited on ITO conductive glass by DSMO-HgI2-H2O solvent evaporation, polycrystalline HgI2 films were then grown on iso-epitaxy layers by PVD. The films grew were investigated by SEM and XRD. The polycrystalline HgI2 films detectors fabricated was studied by an un-collimated 241Am radiative source with the principal energy of 59.5keV at room temperature.


He P.,North Western Polytechnical University of China
Well Testing | Year: 2012

Based on reservoir and flow characteristics of low-permeability reservoir in Changqing oilfield, the applicability of the well testing technology is described. Through practical application and its effect analysis in development of oil field, the guiding sense of well testing technology is illustrated further.


Ismail M.,Beihang University | Yihua C.,Beihang University | Bakar A.,North Western Polytechnical University of China | Wu Z.,Beihang University
Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering | Year: 2014

Heavy rainfall greatly affects the aerodynamic performance of the aircraft. Aerodynamic efficiency degradation due to the heavy rain has been the cause of many aircraft accidents. We have studied the effects of heavy rain on the aerodynamic efficiency of NACA 0012 2D airfoil cruise and landing configurations and NACA 0012 3D rectangular wing. Our results show significant increase in drag and decrease in lift in heavy rain environment. For our study we used preprocessing software gridgen for creation of geometry and mesh and fluent as solver. Discrete phase modeling has been used to model the rain particles using two-phase flow approach. The rain particles have been assumed to be inert. In simulated rain environment, both the 2D airfoil and 3D wing showed significant decrease in lift and increase in drag. This study will be quite useful for the designer of the commercial aircrafts and unmanned aerial vehicles and will be helpful for training of the pilots to control the airplanes better in heavy rain environment. © IMechE 2013 Reprints and permissions: sagepub.co.uk/ journalsPermissions.nav.


Xu G.,Xian Technological University | Gu Z.,North Western Polytechnical University of China | Wei S.,Xian Technological University
Bandaoti Guangdian/Semiconductor Optoelectronics | Year: 2013

In order to improve the orientated growth of HgI2 films in vapor, iso-epitaxy layers of polycrystalline mercuric iodide were deposited on ITO conductive glass by acetone-HgI2-H2O solvent with different concentrations. Polycrystalline HgI2 films were then grown on better orientation iso-epitaxy layers by PVD. The grown films were investigated by SEM and XRD. The efficiency of the detectors was studied by using uncollimated 137Cs as the radiative source with the principle energy of 662 keV at room temperature.


Wang H.,German Aerospace Center | Wang H.,North Western Polytechnical University of China | Herlach D.M.,German Aerospace Center | Liu R.P.,Yanshan University
EPL | Year: 2014

Liquid Cu50Zr50 glass-forming alloy is undercooled by electrostatic levitation up to 311 K below its melting temperature. The dendrite growth velocity is measured as a function of undercooling. A maximum in the velocity-undercooling relation is observed. It is analysed within the dendrite growth theory. The investigations give evidence of a transition from thermally controlled growth at small undercoolings to diffusion-controlled growth at large undercoolings. In the regime where the kinetic interface undercooling dominates, activation energy is determined which is comparable to the activation energy of atomic diffusion. At largest undercoolings deviations from the Arrhenius-like behaviour appear which indicate cooperative atomic diffusion in the temperature range above the glass temperature. © Copyright EPLA, 2014.

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