Sun Q.,LIAONING Technical University
Environmental Science and Pollution Research | Year: 2017
As the largest developing country in the world, China has witnessed fast-paced urbanization over the past three decades with rapid economic growth. In fact, urbanization has been not only shown to promote economic growth and improve the livelihood of people but also can increase demands of regional logistics. Therefore, a better understanding of the relationship between urbanization and regional logistics is important for China’s future sustainable development. The development of urban residential area and heterogeneous, modern society as well regional logistics are running two abreast. The regional logistics can promote the development of new-type urbanization jointly by promoting industrial concentration and logistics demand, enhancing the residents’ quality of life and improving the infrastructure and logistics technology. In this paper, the index system and evaluation model for evaluating the development of regional logistics and the new-type urbanization are constructed. Further, the econometric analysis is utilized such as correlation analysis, co-integration test, and error correction model to explore relationships of the new-type urbanization development and regional logistics development in Liaoning Province. The results showed that there was a long-term stable equilibrium relationship between the new-type urbanization and regional logistics. The findings have important implications for Chinese policymakers that on the path towards a sustainable urbanization and regional reverse, this must be taken into consideration. The paper concludes providing some strategies that might be helpful to the policymakers in formulating development policies for sustainable urbanization. © 2017 Springer-Verlag Berlin Heidelberg
Zeng F.,LIAONING Technical University |
Zou C.,LIAONING Technical University
Liaoning Gongcheng Jishu Daxue Xuebao (Ziran Kexue Ban)/Journal of Liaoning Technical University (Natural Science Edition) | Year: 2013
In the paper, the granular model which contains interface and matrix was introduced, considering the softening behavior of cohesion parameters. In the calculation of FLAC-3D, according to the evolution and distribution of shear strain increments, minimum principal stresses and in surrounding rock of a circular tunnel after excavation. The numerical simulation based on equilibrium shows that higher shear strain increments form an intersecting shear bands network and extends to the depth of the surrounding rock; the phenomenon of the regions with higher minimum principal stresses separated by the regions without higher minimum principal stresses, and the spacing is uniform. With an increase of the tunnel diameter, the number and length of shear bands increases; the annular regions with higher and lower minimum principal stresses get more obvious. At a high confining pressure, clear and ordered distribution of what mentioned above are found on diametrically apposite of the tunnel, and the results are similar to the zonal disintegration phenomenon found in situ.
Cai C.,Central South University |
Gao Y.,LIAONING Technical University |
Gao Y.,University of Calgary
GPS Solutions | Year: 2013
A combination of GPS and GLONASS observations can offer improved reliability, availability and accuracy for precise point positioning (PPP). We present and analyze a combined GPS/GLONASS PPP model, including both functional and stochastic components. Numerical comparison and analysis are conducted with respect to PPP based on only GPS or GLONASS observations to demonstrate the benefits of the combined GPS/GLONASS PPP. The observation residuals are analyzed for more appropriate stochastic modeling for observations from different navigation systems. An analysis is also made using different precise orbit and clock products. The performance of the combined GPS/GLONASS PPP is assessed using both static and kinematic data. The results indicate that the convergence time can be significantly reduced with the addition of GLONASS data. The positioning accuracy, however, is not significantly improved by adding GLONASS data if there is a sufficient number of GPS satellites with good geometry. © 2012 Springer-Verlag.
Li Z.-X.,LIAONING Technical University
Meitan Xuebao/Journal of the China Coal Society | Year: 2010
Based on the problem of ventilation network expressing in 3D ventilation work of coal mine when the foreign gas emits (gas emission, fire, etc.), proposed the concept of active ventilation network, established the mathematical model which was based on active ventilation network. The model and conversion method of the point source and line source of air source were given. Compiled with the MATLAB for active ventilation network simulation computer program referred to as TFM. Through the simulation of ventilation system two examples of gas emission and gas outburst, the results still meet three basic laws: the balance of air volume, pressure balance and ventilation resistance.
Niu W.-J.,LIAONING Technical University
The Scientific World Journal | Year: 2014
In the current practice, to determine the safety factor of a slope with two-dimensional circular potential failure surface, one of the searching methods for the critical slip surface is Genetic Algorithm (GA), while the method to calculate the slope safety factor is Fellenius' slices method. However GA needs to be validated with more numeric tests, while Fellenius' slices method is just an approximate method like finite element method. This paper proposed a new method to determine the minimum slope safety factor which is the determination of slope safety factor with analytical solution and searching critical slip surface with Genetic-Traversal Random Method. The analytical solution is more accurate than Fellenius' slices method. The Genetic-Traversal Random Method uses random pick to utilize mutation. A computer automatic search program is developed for the Genetic-Traversal Random Method. After comparison with other methods like slope/w software, results indicate that the Genetic-Traversal Random Search Method can give very low safety factor which is about half of the other methods. However the obtained minimum safety factor with Genetic-Traversal Random Search Method is very close to the lower bound solutions of slope safety factor given by the Ansys software. © 2014 Wen-jie Niu.
Zhang Y.-J.,LIAONING Technical University
Physica A: Statistical Mechanics and its Applications | Year: 2011
It is known that the thermal conductivity of a dilute gas can be derived by using kinetic theory. We present here a new derivation by starting with two known entropy production principles: the steepest entropy ascent (SEA) principle and the maximum entropy production (MEP) principle. A remarkable feature of the new derivation is that it does not require the specification of the existence of the temperature gradient. The known result is reproduced in a similar form. © 2011 Elsevier B.V. All rights reserved.
Xiujie L.,LIAONING Technical University
International Journal of Digital Content Technology and its Applications | Year: 2012
Equipment quality management integrated plan is a planning management job of systemic, synthetically, competitive and comprehensive characteristic. It deals with equipment quality management total process integration (demonstrate phase, manufacture and production phase, trial and appraisal phase, use and support phase, retire and scrap phase), total hierarchy integration (stratagem level, battle level and tactics level), total member integration (military unit, supplier and consultation institution).Firstly, actuality of equipment quality management system must be fully considered at present. Secondly, differences and relations between quality planning and quality management planning must be recognized. Thirdly, solving equipment quality management problems must be regarded as the study goal. Hence, this paper establishes equipment quality management integrated plan model based on the total system and life-cycle equipment quality management idea, and presents the new mode of equipment quality management planning.
Zhang Y.-J.,LIAONING Technical University
Physica A: Statistical Mechanics and its Applications | Year: 2012
It is known that the viscosity of a dilute gas can be derived by using kinetic theory. We present here a new derivation by using two entropy production principles: the steepest entropy ascent (SEA) principle and the maximum entropy production (MEP) principle. The known result is reproduced in a similar form. © 2012 Elsevier B.V. All rights reserved.
Wang X.-B.,LIAONING Technical University
Journal of Mechanics of Materials and Structures | Year: 2010
A new method for predicting the peak temperature evolution in the adiabatic shear band (ASB) of steel is proposed to overcome the drawback of the traditional method's underestimation of the peak temperature in the ASB. The average shear strain of a thin-walled tube in torsion is divided into three parts: the elastic shear strain, the average plastic shear strain outside the ASB, and the average plastic shear strain of the ASB. The relation between the shear stress acting on the tube and the average shear strain of the tube is established. The postpeak shear stress-average shear strain curve of the ASB is found to be dependent on the gage length. As an example, the shear stress-average plastic shear strain curve of the ASB is backcalculated from the measured shear stress-average shear strain curve of an AISI 1018 cold rolled steel tube. The peak temperature and average temperature in the ASB are calculated and compared with the experimental result. It is found that the calculated peak temperature is closer to or slightly higher than the experimental result. The latter is a satisfactory result due to the underestimated peak temperature in the ASB in experiments. © 2010 Mathematical Sciences Publishers.
Wang X.-B.,LIAONING Technical University
Transactions of Nonferrous Metals Society of China (English Edition) | Year: 2011
Based on the expression proposed by WANG for the local plastic shear deformation distribution in the adiabatic shear band (ASB) using gradient-dependent plasticity, the effects of 10 parameters on the adiabatic shear sensitivity were studied. The experimental data for a flow line in the ASB obtained by LIAO and DUFFY were fitted by use of the curve-fitting least squares method and the proposed expression. The critical plastic shear strains corresponding to the onset of the ASB for Ti-6Al-4V were assessed at different assigned ASB widths. It is found that the proposed expression describes well the non-linear deformation characteristics of the flow line in the ASB. Some parameters in the JOHNSON-COOK model are back-calculated using different critical plastic shear strains. The adiabatic shear sensitivity decreases as initial static yield stress, work to heat conversion factor and strain-rate parameter decrease, which is opposite to the effects of density, heat capacity, ambient temperature and strain-hardening exponent. The present model can predict the ASB width evolution process. The predicted ASB width decreases with straining until a stable value is reached. The famous model proposed by DODD and BAI only can predict a final stable value. © 2011 The Nonferrous Metals Society of China.