China Railway Corporation, Southwest Jiaotong University and CHANGZHOU PACIFIC Electrical POWER EQUIPMENT GROUP CO. | Date: 2015-04-20
A rolled iron core traction transformer, comprising an iron core (1); the iron core (1) is formed by splicing two symmetrical annealed iron-core closed single frames (1-1); each iron-core closed single frame (1-1) is formed by sequentially coiling continuous silicon steel sheets; the iron-core closed single frame (1-1) has two iron core column single bodies (1-1-1) having approximately semicircular cross sections; the iron core (1) has two iron core columns (1-2) thereon spliced by the iron core column single bodies (1-1-1) and having approximately circular cross sections; each iron core column (1-2) is sequentially provided with a low-voltage T winding (6), a low-voltage F winding (5) and a high-voltage winding (4) thereon from inside to outside; two sides of each high-voltage winding (4) are respectively provided with a first tapping area and a second tapping area; the first tapping area is provided with low-voltage side high-voltage tapping outgoing lines (16); the second lapping area is provided with high-voltage side high-voltage tapping outgoing lines (18); two low-voltage side high-voltage tapping outgoing lines (16) are connected together via a no-load voltage regulation switch (9); and two high-voltage side high-voltage tapping outgoing lines (18) are connected together via another no-load voltage regulation switch (9). The transformer reduces no-load loss, has a small no-load current, low noise and strong anti-short circuit capability, reduces the electrodynamic force generated by a sudden short circuit, and improves the short circuit tolerance capability of the transformer.
China Railway Corporation, Southwest Jiaotong University and Changzhou Pacific Electrical Power Equipment Group Co. | Date: 2017-04-05
A rolled iron core traction transformer, comprising an iron core (1); the iron core (1) is formed by splicing two symmetrical annealed iron-core closed single frame (1-1) ; each iron-core closed single frame (1-1) is formed by sequentially coiling continuous silicon steel sheets; the iron-core closed single frame (1-1) has two iron-core column single bodies (1-1-1),which having approximately semicircular cross sections; the iron core (1) has two iron-core columns (1-2), which have approximately circular cross section, thereon formed by splicing two iron-core column single bodies (1-1-1) ; each iron-core column (1-2) is sequentially provided with a low-voltage T winding (6), a low voltage F winding (5) and a high-voltage winding (4) thereon from inside to outside; two sides of each high-voltage winding (4) are respectively provided with a first tapping area and a second tapping area, the first tapping area is provided with low-voltage side high-voltage tapping outgoing lines (16), the second tapping area is provided with high-voltage side high-voltage tapping outgoing lines (18), two low-voltage side high-voltage tapping outgoing lines (16) are connected together with a no-load voltage regulation switch (9), and two high-voltage side high-voltage tapping outgoing lines (18) are connected together with another no-load voltage regulation switch (9).The transformer has a significant the improvement such as a reduced no-load loss, a reduced no-load current, lower noise , stronger anti-short circuitcapability, a reduced electrodynamic force generated by a sudden short circuit, and a improvement of the short circuit tolerance capability of the transformer.
Li J.,Southwest Jiaotong University
Colloids and surfaces. B, Biointerfaces | Year: 2013
Both coverage and morphology of endothelial cells (ECs) on blood contact biomaterials were involved in the antithrombotic and anti-proliferative process. However, most researches have been focused on the ECs amount on the materials surface, but not the morphology. As of now, little is known about the relationship between the ECs morphology and the cytokine secretion, especially those anticoagulant factors on cardiovascular implants. In this study, three sizes of parallel micro-stripes of high molecular weight hyaluronic acid (HMW-HA) were fabricated on the NaOH-treated titanium (TiOH) surface. These micro-patterns of ridges/grooves were used to regulate the distribution, morphology and cytokine secretion of the ECs. The roughness of bare Ti and TiOH was detected by AFM, and the micro-pattern sizes were imaged by SEM. The chemical bonding of HMW-HA to the TiOH surface was demonstrated by FTIR, and the element distribution was examined by EDX. The morphology index of the ECs was analyzed to evaluate the orientation, elongation and spreading of the ECs on the micro-patterned surfaces and the control, while the cell number and cytokine secretion of the ECs were measured by related kits. The characterization of the ECs demonstrated that the bigger L/B index improved NO, PGI2, Fn release and TM, TFPI, E-Selectin expression as well as reducing vWF secretion. The platelet adhesion test and the whole blood clotting time test proved the increasing anticoagulation property of ECs with their elongation increasing. These results suggest that ECs morphology-related function can be regulated by different sizes of micro-patterns. Copyright © 2013. Published by Elsevier B.V.
Yuan H.,Southwest Jiaotong University
Journal of Cleaner Production | Year: 2013
Recent years have witnessed a significant amount of construction waste as a result of rapid urbanization and large scale of construction activities in China. However, compared to many advanced western countries, very few studies have been carried out for investigating the construction waste management problems in China. This study, by conducting a strength, weakness, opportunity, and threat (SWOT) analysis, aims to help understand the status quo of construction waste management based on the particular context of Shenzhen city in south China. Data supporting the analysis are derived from multiple channels including governmental reports, waste management related regulations, literature review, and focus group meetings. The study opens a window through which major stakeholders involved can perceive the internal and external conditions of construction waste management in Shenzhen. The seven critical strategies, which are presented based on the SWOTs identified, could be useful for Shenzhen to develop and promote its future construction waste management at the strategic level. © 2012 Elsevier Ltd. All rights reserved.
Zhang H.,Southwest Jiaotong University |
Lewis F.L.,University of Texas at Arlington
Automatica | Year: 2012
A practical design method is developed for cooperative tracking control of higher-order nonlinear systems with a dynamic leader. The communication network is a weighted directed graph with a fixed topology. Each follower node is modeled by a higher-order integrator incorporating with unknown nonlinear dynamics and an unknown disturbance. The leader node is modeled as a higher-order nonautonomous nonlinear system. It acts as a command generator giving commands only to a small portion of the networked group. A robust adaptive neural network controller is designed for each follower node such that all follower nodes ultimately synchronize to the leader node with bounded residual errors. Moreover, these controllers are distributed in the sense that the controller design for each follower node only requires relative state information between itself and its neighbors. A simulation example demonstrates the effectiveness of the algorithm. © 2012 Elsevier Ltd. All rights reserved.
Yuan H.,Southwest Jiaotong University
Waste Management | Year: 2012
It has been determined by existing literature that a lot of research efforts have been made to the economic performance of construction waste management (CWM), but less attention is paid to investigation of the social performance of CWM. This study therefore attempts to develop a model for quantitatively evaluating the social performance of CWM by using a system dynamics (SD) approach. Firstly, major variables affecting the social performance of CWM are identified and a holistic system for assessing the social performance of CWM is formulated in line with feedback relationships underlying these variables. The developed system is then converted into a SD model through the software iThink. An empirical case study is finally conducted to demonstrate application of the model. Results of model validation indicate that the model is robust and reasonable to reflect the situation of the real system under study. Findings of the case study offer helpful insights into effectively promoting the social performance of CWM of the project investigated. Furthermore, the model exhibits great potential to function as an experimental platform for dynamically evaluating effects of management measures on improving the social performance of CWM of construction projects. © 2012 Elsevier Ltd.
Li X.-Y.,Southwest Jiaotong University
International Journal of Solids and Structures | Year: 2014
This present work is concerned with planar cracks embedded in an infinite space of one-dimensional hexagonal quasicrystals. The potential theory method together with the general solutions is used to develop the framework of solving the crack problems in question. The mode I problems of three common planar cracks (a penny-shaped crack, an external circular crack and a half-infinite crack) are solved in a systematic manner. The phonon and phason elastic fundamental fields along with some important parameters in crack analysis are explicitly presented in terms of elementary functions. Several examples are given to show the applications of the present fundamental solutions. The validity of the present solutions is discussed both analytically and numerically. The derived analytical solutions of crack will not only play an important role in understanding the phonon-phason coupling behavior in quasicrystals, but also serve as benchmarks for future numerical studies and simplified analyses. © 2013 Elsevier Ltd. All rights reserved.
Yuan H.,Southwest Jiaotong University
Ecological Indicators | Year: 2013
Effective construction and demolition (C&D) waste management is indispensable to the attainment of sustainable construction. Many endeavors so far have been made to assess C&D waste management. However, the majority of efforts have been attempted to investigate C&D waste management from an economic point of view, while very few studies have been focused on the environmental and social aspects, which are imperative to promote effective C&D waste management. This paper identifies 30 key indicators affecting the overall effectiveness of C&D waste management from a holistic perspective and develops a C&D waste management effectiveness assessment framework by integrating the key indicators identified. The assessment framework not only deepens understanding of effectiveness of C&D waste management, but also provides a concrete base for future research in assessing the effectiveness of C&D waste management quantitatively. © 2012 Elsevier Ltd. All rights reserved.
Zhang G.,Southwest Jiaotong University
Journal of Heuristics | Year: 2011
Quantum-inspired evolutionary algorithms, one of the three main research areas related to the complex interaction between quantum computing and evolutionary algorithms, are receiving renewed attention. A quantum-inspired evolutionary algorithm is a new evolutionary algorithm for a classical computer rather than for quantum mechanical hardware. This paper provides a unified framework and a comprehensive survey of recent work in this rapidly growing field. After introducing of the main concepts behind quantum-inspired evolutionary algorithms, we present the key ideas related to the multitude of quantum-inspired evolutionary algorithms, sketch the differences between them, survey theoretical developments and applications that range from combinatorial optimizations to numerical optimizations, and compare the advantages and limitations of these various methods. Finally, a small comparative study is conducted to evaluate the performances of different types of quantum-inspired evolutionary algorithms and conclusions are drawn about some of the most promising future research developments in this area. © 2010 Springer Science+Business Media, LLC.
Southwest Jiaotong University | Date: 2013-12-22
The present invention belongs to the field of image processing, and particularly relates to the determination of an aerial remote sensing image fuzzy parameter and the elimination of aerial remote sensing image fuzziness based on a TDI-CCD camera. The method comprises the following specific steps: establishing an image coordinate system, reading an area array image, constructing a similarity matching criterion, conducting offset resolving to acquire homonymy points so as to obtain a digital image reducing the chattering influence. The method is relatively simple and precise in computing process, and good in processing effect.