Qinghai Communications Technical College

Xining, China

Qinghai Communications Technical College

Xining, China
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Gu X.,Qinghai Communications Technical College | Cheng Z.,Chongqing Jiaotong University
Wuhan Ligong Daxue Xuebao (Jiaotong Kexue Yu Gongcheng Ban)/Journal of Wuhan University of Technology (Transportation Science and Engineering) | Year: 2017

Based on the principle of asphalt material selection of asphalt mixture mechanical strength, this paper studies the effects of different grades and different brands of asphalt, the relationship among the regular performance indicators such as the penetration, softening point, ductility, brinell viscosity and surface free energy, polar component, dispersion component of those asphalts are built to put forward the asphalt material optimization methods. Results indicate that: the splitting strength of asphalt mixture has an increase tendency with the large of surface free energy and dispersion component, but has a decrease tendency with polar component. Asphalt material optimization principle is the largest surface free energy and dispersion component, but the smallest polar component of asphalt. It shows good linear relationship for conventional indicators with surface free energy and its parameters of asphalts. For surface free energy, it shows a negative correlation with penetration, 10℃ ductility, but positive correlation with softening point, 135℃ brinell viscosity. Premising of the current specification requirement, the asphalt is optimally selected, whose indexes are small penetration, high softening point, small ductility and high viscosity, considering the mechanical strength of asphalt mixture. © 2017, Editorial Department of Journal of Wuhan University of Technology. All right reserved.

Zhao Q.,Xi'an Physical Education University | Deng G.,Qinghai Communications Technical College | Ma B.,Polytechnic University of Mozambique
Fangzhi Gaoxiao Jichukexue Xuebao | Year: 2015

In order to analyze the influence of human body motion on clothing thermal comfort and heat retention in normal dress condition, from the perspective of thermodynamics,hygiene and kinesiology, the thermal comfortable index of clothing was analyzed such as skin temperature and environment temperature in the cases of statieness and motion. The results show that the wind speed, different pace, different body surface temperature, and different relative humidity have great influences on clothing thermal resistance when people are in motion, among which the flow of air layer of clothing and the amount of dead space air between the fabric yarn are major factor affecting clothing thermal resistance.

Fu X.,Hangzhou Dianzi University | Fu X.,Qinghai Communications Technical College | Li J.,Hangzhou Dianzi University | Yu Z.,Hangzhou Dianzi University
Jisuanji Fuzhu Sheji Yu Tuxingxue Xuebao/Journal of Computer-Aided Design and Computer Graphics | Year: 2015

Local binary pattern (LBP) is conceptually regarded as non-oriented, so it cannot capture sufficiently detailed information. Aiming at the problem, the local orientational pattern (LOP) method is proposed. It labels the pixels of the image by comparing two orientational differences at two neighboring pixels and encodes the change of the neighborhood orientational difference. Then LOP is extended to three-dimensional space, the spatiotemporal local orientational pattern (SLOP) is presented. The features obtained from three orthogonal planes are concatenated into a single vector. Finally the multi-scale SLOP histogram is used as face representation and projected onto locality preserving projection space to obtain lower-dimensional feature. Experimental results on Cohn-Kanade and MMI facial expression databases demonstrate that the proposed method outperforms other existing approaches in recognition rate and recognition speed. ©, 2015, Institute of Computing Technology. All right reserved.

Wang Y.H.,Qinghai Communications Technical College
Advanced Materials Research | Year: 2014

In this paper, the local fractional Hilbert transform in fractal space is established. The characteristics of this local fractional transform are discussed in the following. Considering the basic properties of the local fractional Hilbert transforms, a kind of transform for local fractional is derived and analyzed. © (2014) Trans Tech Publications, Switzerland.

Zhou Y.-C.,Qinghai Communications Technical College | Chen S.-A.,Jiangsu University | Wang Y.-G.,Jiangsu University | Wang D.,Jiangsu University | And 2 more authors.
Jiaotong Yunshu Gongcheng Xuebao/Journal of Traffic and Transportation Engineering | Year: 2012

In order to reasonably match the pre-charge pressure, maximum working pressure and volume of accumulator for active suspension without external energy supply based on LQG(linear quadratic Gaussian) control, twice standard deviation of ideal control force was proposed as the maximum force output of active suspension to meet 95.4% of work demand, and the parameters of reclaiming energy/active cylinder were taken into account to ascertain the ideal working pressure of accumulator. To make the pressure fluctuation in accumulator less than 5%, the pre-charge pressure and maximum working pressure of accumulator were matched. The energy flow equations between active suspension and accumulator were deduced. Under 2 kW load, the varying volume's dynamic simulation of accumulator was carried out. Computation result shows that the ideal working pressure of accumulator is 23.008 MPa, and the quadratic performance index of the suspension increases 5.21% compared with the ideal state. Accumulator's pre-charge pressure, maximum working pressure and volume are 11.108 MPa, 23.583 MPa and 2.5 L respectively, and the maximum pressure fluctuation in accumulator is 1.03% when the active suspension without external energy supply based on LQG control works steadily. So the demand with low manufacture cost, good suspension performance and high energy reclaiming efficiency for the active suspension is achieved.

Zhou Y.-C.,Qinghai Communications Technical College | Chen S.-A.,Jiangsu University | He R.,Jiangsu University
Chang'an Daxue Xuebao (Ziran Kexue Ban)/Journal of Chang'an University (Natural Science Edition) | Year: 2013

In order to study the influence of velocity change on vehicle ride comfort, taking the influence of longitudinal inertia force and time-variant white noise frequency from vehicle velocity change into account, a suspension dynamic model of 1/2 vehicle was established with road random inputs. The time-variant white noise frequency model was obtained by using the Lookup Table Module in the Matlab/Simulink Software with road by the real-time vehicle speed. The results show that velocity change makes the index of suspension deflection become worse obviously but has no influence on the indexes of tire deflection, sprung mass acceleration and body pitching angle acceleration. The bigger the change of vehicle speed and the less the suspension stiffness, the more obvious the phenomena above. When the height of mass centre is decreased by 20% and the stiffnesses of all springs are increased by 10%, the vertical and pinching acceleration indexes increase by 6.96% and 0.89% respectively, and the front and rear suspension deflection indexes decrease by 20% and 17.6% respectively.

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