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Zhu X.,Zhejiang Normal University | Yu Y.,Lan Zhou JiaoTong University | Wei Q.,Zhejiang Normal University | Zou X.,Lan Zhou JiaoTong University | Huang C.,Zhejiang Normal University
Key Engineering Materials | Year: 2012

It is need to experiment to verify the correctness and validity of various stages in system design after gauge visual detection system designing between high signals and contact net. Then it does error analysis from lighting conditions, camera resolution, binocular imaging system installation structure, camera out of synchronized, noise and subsequent image processing operations, etc. It analysis the systematic errors principle and specific impact, then identifies specific improvements. There are detection errors between detection results and the true value of the measured in the detection process, because of measurement instrument inaccurate, detect means imperfect, detection environment change, people limitations of recognize the existence objective things and resulting errors in detection work. Error can be divided into random error, negligent error and systematic error by source and nature [1]. (1) Random errors are mainly caused by some factors which are difficult to control, such as the fluctuations of measurement value, detection personnel proficiency, sensory errors and changes in external conditions and a series of problems. Values and symbols of this type error in series of measurements are uncertain and can not be eliminated. Statistical properties are mostly following a normal distribution. With the increase of measurements number, the average random error is getting smaller. Therefore, it is common used methods of increasing measurements number to reduce the impact of such errors. (2) Negligent errors are caused by the detection personnel carelessness, such as reading error or due to operational errors. Such errors are often a big difference with the normal error, and significantly more than systematic errors and random errors under the normal conditions. Such errors can be eliminated by increasing the automation and control of the detection system, and reducing the manual method. (3) Systematic errors are mainly caused by detection equipment defective, incomplete or not the specified conditions, the experimental theory, using the instruments incomplete or not in accordance with the specified conditions, experimental theory, experimental methods or experimental conditions not meting the requirements, detection personal habits and other factors. Symbols and impact in such errors detection process have the same size or a fixed law. Therefore, it can identify error causes, and take appropriate measures to reduce the error caused by the impact, according to specific experimental conditions and the system characteristics. Due to the regularity of systematic errors, it can predict and control them. Therefore, it is from the entire gauge visual detection process between high signals and contact net to analysis system error. It contains many factors that light brightness, device performance, binocular imaging system mounting structure, camera imaging model, image preprocessing, image positioning and segmentation, stereo matching and 3D reconstruction, detection process and other processes, affect systematic errors [2]. © (2012) Trans Tech Publications, Switzerland.


Li X.,Zhejiang Normal University | Zhu X.,Zhejiang Normal University | Yu Y.,Lan Zhou JiaoTong University | Zou X.,Lan Zhou JiaoTong University | Huang C.,Zhejiang Normal University
Key Engineering Materials | Year: 2012

In the design process of gauge visual detection system between high signals and contact net, it is need to do target positioning and segmentation between high signals and contact line. The paper first analyzes the structural characteristics of high signals and contact line, and then uses the Sobel operator for edge detection, and uses first close and then open of image morphological operations for edge treatment, finally uses Hough transform for line and circle detection to extract the object's edge. This positioning and segmentation of target object would be achieved. In the gauge detection process of high signals and contact net, the positioning and segmentation of backplane surface on high signals and contact line in image is a very critical step, the outcome directly affects late system performance. When it does the image processing, importing an image, and getting out also an image; but it does image analysis, importing an image but getting out the image description[1]. If you want to do image processing, it must divide the images into a number of therefore, image positioning and segmentation techniques are occur. It separate out backplane surface on high signals and contact line from target image of complex background, the nature problem is image positioning and segmentation. It is the starting point of this thesis with structural characteristics of backplane surface on high signals and contact line to do positioning and segmentation[2]. © (2012) Trans Tech Publications, Switzerland.


Jia J.,Lan Zhou JiaoTong University | Zhang Y.,Chinese Academy of Sciences | Liu X.,Chinese Academy of Sciences | Zhang X.,Liaoning Railway Vocational and Technical college | Zhou X.,Chinese Academy of Sciences
Information Technology Journal | Year: 2013

Information management of road's elementary data will play a more important role for accident treatment, disaster relief, data management, engineering construction and others. In this study, we use the MapX and VB programs, the database of road property is designed and the methods of data's input, edit and building of Geoset object are all analyzed. The functional modules, including file management, view operation, select query, object editor, are established and the embedded procedures are all analyzed, too. Based on this, the information system are developed which can realize the information management of road basic data. © 2013 Asian Network for Scientific Information.


Jlv J.,Lan Zhou JiaoTong University | Jlv J.,Key Laboratory For The Exploitation Of Southwestern Rsrc And The Environmental Hazard Control Engineering | Wang H.,Key Laboratory For The Exploitation Of Southwestern Rsrc And The Environmental Hazard Control Engineering | Wang H.,Chongqing University | And 3 more authors.
Disaster Advances | Year: 2010

Honggutan deep foundation fit was reinforced by soil nailing, shot concrete and steel bar mesh. According to the engineering characteristic, the safety grade is valued two, based on this, the reinforcement pressure of unit area of soil nailing which is about 115.92kN is calculated, and it is larger than the largest lateral earth pressure which is about 71.43kN, from which we can know that the foundation fit is stable. The 3D-s finite element program was used to simulate axial force of soil nailing, lateral displacement of foundation fit and surface displacement, and the simulation results were all small from which it can be known that the foundation fit is stable. The calculation results accord with the theory calculations. The study results also show that relative displacement of foundation fit fringe decreases with the excavated depth increasing, and surface settlement decreases quickly with the distance between surface and foundation fit fringe increasing. Foundation fit; soil nailing; stability.


Yue H.,Lan Zhou JiaoTong University | Haiyan L.,Lanzhou Petrochemical Company
Advanced Materials Research | Year: 2013

A prediction algorithm for traffic flow prediction of BP neural based on Differential Evolution(DE) is proposed to overcome the problems such as long computing time and easy to fall into local minimum by combing DE and neural network. In the algorithm, DE is used to optimize the thresholds and weights of BP neural network, and the BP neural network is used to search for the optimal solution. The efficiency of the proposed prediction method is tested by the simulation of real traffic flow. The simulation results show that the proposed method has higher precision compared with the traditional BP neural network, so prove it is feasible and effective in the practical prediction of traffic flow. ©(2013) Trans Tech Publications, Switzerland.


Jia J.Q.,Lan Zhou JiaoTong University | Jia J.Q.,Key Laboratory For The Exploitation Of Southwestern Rsrc And The Environmental Hazard Control Engineering | Wang H.T.,Key Laboratory For The Exploitation Of Southwestern Rsrc And The Environmental Hazard Control Engineering | Yang W.Y.,Jiang Xi Hong Cheng Realty Development Ltd.
ICIC 2010 - 3rd International Conference on Information and Computing | Year: 2010

The deep foundation fit of Xin Ming He building was reinforced by soil nail, shot concrete and steel bar mesh, and the calculated pressure per unit area of soil nail is about 83.48kN which is larger than the largest lateral earth pressure which is about 59.55kN, from which it can be known that the foundation fit is stable. Meanwhile, the 3D-σ finite element program was used to simulate axial force of soil nail, lateral displacement of foundation fit and surface displacement, and their values are all small which show that the foundation fit is stable. © 2010 IEEE.


Jia J.,Lan Zhou JiaoTong University | Jia J.,Key Laboratory for the Exploitation of Southwestern Resources | Wang H.,Key Laboratory for the Exploitation of Southwestern Resources | Zhang X.,Lan Zhou JiaoTong University | Li J.,Lan Zhou JiaoTong University
Advanced Materials Research | Year: 2012

The situation of road traffic in China was analyzed, and the results showed that the numbers of RTD decreased year by year, but the absolute numbers are still large. The main influence factors including human factor, vehicle factor, road factor and environmental factor were analyzed, and the results showed that human factor is the most important factor. Some measures on safety management of road traffic were given with references to the advanced management experiences of developed countries. © (2012) Trans Tech Publications, Switzerland.


Zhao F.,Lan Zhou JiaoTong University | Wu B.,Lan Zhou JiaoTong University
Lecture Notes in Electrical Engineering | Year: 2012

High-power controlled rectifier circuit includes a balanced reactor with dual reverse star-controlled rectifier, and multiple rectifier circuit. In this paper, we analyze and calculate the voltage of the thyristor for the working process of a dual reverse star-controlled rectifier with balanced reactor, and MATLAB simulation, making a basis for the study of the application in the occasions which requires low voltage, high current, and provides a basis for the exact choice of power electronic devices in order to save energy and reduce costs. © 2012 Springer-Verlag London Limited.


Yang Q.,Lan Zhou Jiaotong University | Xu X.,Lan Zhou Jiaotong University | Li P.,Lan Zhou Jiaotong University | Liu J.,Lan Zhou Jiaotong University
2012 International Symposium on Geomatics for Integrated Water Resources Management, GIWRM 2012 | Year: 2012

Four low temperature plasma modification methods (only plasma modification, hybrid plasma-chemical deposition, plasma liquid graft and plasma-chemical deposition) had been used to modify PVDF hollow-fiber membrane. In this paper, it studied the responsiveness of flux of four different modification membrane for the pH value, temperature and different electrolyte solution (potassium chloride, sodium chloride, sodium chloride, and sodium sulphate). The results showed that low temperature plasma modification method can graft or aggregate effectively on membrane surface, so it influences the membrane flux responsiveness. The membranes which are modified by acrylic plasma chemical deposition method and nitrogen acrylic mixed with plasma chemical deposition have a stronger acid, and the latter has a higher ionization degree. Only plasma modification and Plasma Liquid graft membranes had larger flux response in acid condition than in alkali condition. As the temperature increases, the grafted polymer on the surface of modification membrane contracts, which reduces the boundary layer thickness and viscosity. Therefore, the flux increasing rate of modification membrane is higher than that of the original film. The flux response of PVDF plasma modification membrane in the four electrolyte solutions with different concentration is more complicated. The main reason is the absorption-permeability of grafted polymer in film hole, the electrical shielding and neutralizing action of electrolyteion to grafted polymerization polymer chain, and electro-viscous effect caused by countra-ion reverse migration due to flow potential. Thus membrane aperture changes and flux response changes as well. © 2012 IEEE.

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