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Online since: August 2016
Authors: Jun Hua Xiao
Influences of Subgrade Structure Form on Dynamic Responses of Railway Subgrade under Cyclic Loading
Junhua Xiao1, a *
1Key Laboratory of Road and Traffic Engineering of the Ministry of Education,
Tongji University, Shanghai 201804, China
a20880380@qq.com (Corresponding Author)
Keywords: Railway subgrade, Embankment, Cutting, Dynamic response, Field tests of repeated loading
Abstract.
However, significant differences in the design of subgrade and in the use of filling material exist among countries [1-4].
The ratio of lime to natural soil was a key parameter when filling subgrade, which was determined by extensive laboratory and field soil testing.
However, significant differences in the design of subgrade and in the use of filling material exist among countries [1-4].
The ratio of lime to natural soil was a key parameter when filling subgrade, which was determined by extensive laboratory and field soil testing.
Online since: December 2013
Authors: Ai Min Li, Hua Hu Cheng, Mo Jia Huang
Stress Distribution Form and Function Representation of Four Free Edges Square Basal Bottom Slab Touching Foundation
Aimin Li1,a, Huahu Cheng1,b and Mojia Huang1,c
1Institute of Engineering Mechanics, Nanchang University, Nanchang, Jiangxi, 330031, China
aliaimin@ncu.edu.cn, bchenghuahu775858@163.com, cmojiahuang@hotmail.com
Keywords: square basal bottom slab, contact stress, width height ratio, numerical simulation, fitting
Abstract. this article constructed the stress distribution’s function expression of four free edges square basal bottom slab touching foundation respectively from the two aspects of symmetric and anti-symmetric load, placed the foundation on the surface of the sandy soil, do numerical simulation to the contact stress between foundation slab and foundation through the large scale finite element analysis software ANSYS, and fitting by adopting the contact stress function proposed in this article.
The key of back plane flexural torque calculation is to determine the contact stress between the foundation and the soil, specific formula is based on the assumption of ground reaction force linear distribution, while the width height ratio is more than 2.5, it is not clear about the stress distribution between the foundation and the soil at present[4,5].
When modeling using solid45 entity unit, base adopt the isotropic elastic material, cohesive soil constitutive model adopt ANSYS’ Drucker-Prager yield criterion.
The key of back plane flexural torque calculation is to determine the contact stress between the foundation and the soil, specific formula is based on the assumption of ground reaction force linear distribution, while the width height ratio is more than 2.5, it is not clear about the stress distribution between the foundation and the soil at present[4,5].
When modeling using solid45 entity unit, base adopt the isotropic elastic material, cohesive soil constitutive model adopt ANSYS’ Drucker-Prager yield criterion.
Online since: July 2017
Authors: Marcos A.S. Barrozo, A.M.R. Filho, G.R.L. Carvalho, Angelica Silva Reis
João Naves de Ávila, 2121, Campus Santa Mônica, Bloco 1K, 38400-902,
School of Chemical Engineering, Federal University of Uberlândia, Uberlândia, MG, Brazil
asreis.angelica@gmail.com, b argileumrfilho@gmail.com, cgui.ribeiro119@gmail.com, emasbarrozo@ufu.br
Keywords: bubble size, air holdup, surfactant, column flotation
Abstract.
The contact and adherence of hydrophobic mineral particles to air bubbles is a key step in this process [11].
Material and Methods Experimental apparatus.
The contact and adherence of hydrophobic mineral particles to air bubbles is a key step in this process [11].
Material and Methods Experimental apparatus.
Online since: April 2014
Authors: Man Zhao, Yu Rong Zhong, Bao Long Xu
Lu2O3 is a promising scintillator material for ionizing radiation sensors employing CCD detectors, which is applied to more areas in response to the need for high-performance detectors for use in high-energy physics, medicine and industry [3-5].
Cetyl trimethyl ammonium bromide (CTAB) was added as surfactants which performed a key role to reduce interfacial tension sufficiently and promote thermodynamic stability of micro-emulsion.
[7] Fang Xiao-long, Yang Chuan-fang, Chen Jia-yong, Synthesis of ZrO2 nanoparticles by using CTAB/Hexanol/Water/Salts reversed micelles, Engineering Chemistry&Metallurgy. 18 (1997) 67-71
Cetyl trimethyl ammonium bromide (CTAB) was added as surfactants which performed a key role to reduce interfacial tension sufficiently and promote thermodynamic stability of micro-emulsion.
[7] Fang Xiao-long, Yang Chuan-fang, Chen Jia-yong, Synthesis of ZrO2 nanoparticles by using CTAB/Hexanol/Water/Salts reversed micelles, Engineering Chemistry&Metallurgy. 18 (1997) 67-71
Online since: April 2014
Authors: Yan Wang, Zhi Feng Liu, Ying Han, Jun Dai, Shao Feng Ge
The Planning of Urban Public Facilities via Universal Design
Han Ying1, 2,a, Liu Zhifeng1, Dai Jun1, Ge Shaofeng1, Wang Yan1
1 Architectural Engineering Department, Jinling Institute of Technology, Nanjing, 211169, China
2 School of Architecture, South-east University, Nanjing, 210096, China
a chelsea_han@jit.edu.cn
Keywords: Universal design, Accessible route, Low height service facilities, Fairness, Sustainable
Abstract.
Public facilities should implement the same principles, requiring our designers take into consideration of the sustainability of the resource conservation and environmental protection in all aspects including material selection, facility construction, production processes, use of facilities and waste treatment. 4 Conclusions As mentioned earlier, the urban public facilities are used by a wide range of population which reflects the degree of caring people of the city, and it is also an important content of the construction of the urbanization and modern civilization.
Acknowledgement This paper is supported by Urban and Rural Planning discipline of Jinling Institute of Technology which is a key building discipline in Jiangsu Province.
Public facilities should implement the same principles, requiring our designers take into consideration of the sustainability of the resource conservation and environmental protection in all aspects including material selection, facility construction, production processes, use of facilities and waste treatment. 4 Conclusions As mentioned earlier, the urban public facilities are used by a wide range of population which reflects the degree of caring people of the city, and it is also an important content of the construction of the urbanization and modern civilization.
Acknowledgement This paper is supported by Urban and Rural Planning discipline of Jinling Institute of Technology which is a key building discipline in Jiangsu Province.
Online since: September 2013
Authors: Bo Wei Lei, Bing Wu, Zhen Jiang Yu, Zhi Yan Zhao, Zhi Guo Guo
Study on the Coal mine Emergency Rescue Information Management System Based on WEBGIS
Bing Wu 1, a, Baiwei Lei 1, b, zhenjiang Yu 1, c, Zhiyan Zhao 1, b, Zhiguo Guo 1,b
1 Faculty of Resources and Safety Engineering ,China University of Mining and Technology(Beijing), 100083, Beijing , China including country
a wbelcy@vip.sina.com, bleibws@163.com, c 937376536@qq.com
Keywords: Coal mine; accident; emergency rescue;webgis
Abstract.
Mine emergency rescue ability is a key to ensure the safety of miners and prevent the accident.The coalmine emergency rescue is primarily responsible for rescuing persons in distress, preventing and eliminating the accident after coalmine accidents.
Figure 6 E-R map 4 The introduction of system function First,it provides all kinds of information management and technical support which is necessary for on-site rescue in emergency rescue;Second,it provides emergency exercises and training service for mine rescue crew,the group's leadership and ordinary workers in the daily work; finally, it also provide the management of base relief material, technical data, personnel and the monitor of practice roadway and practice mine.The system which is based on the database information management system establishes the system portal site integrating real-time monitoring system .
Mine emergency rescue ability is a key to ensure the safety of miners and prevent the accident.The coalmine emergency rescue is primarily responsible for rescuing persons in distress, preventing and eliminating the accident after coalmine accidents.
Figure 6 E-R map 4 The introduction of system function First,it provides all kinds of information management and technical support which is necessary for on-site rescue in emergency rescue;Second,it provides emergency exercises and training service for mine rescue crew,the group's leadership and ordinary workers in the daily work; finally, it also provide the management of base relief material, technical data, personnel and the monitor of practice roadway and practice mine.The system which is based on the database information management system establishes the system portal site integrating real-time monitoring system .
Online since: May 2011
Authors: X.G. Shen, J.T. Zhang
Shenb
College of Mechanical Engineering & Automation, The North University of China, Taiyuan, China, 030051
ajitangzh@sina.com, b65961420@qq.com
Key words: Ultrasonic testing,Thickness,Amplitude Spectrum,Tree classifier.
The time domain aliasing of the ultrasonic detection signals happens when the Coating thickness is small. it results in the extraction of the thickness eigenvalue difficult, even could not be extracted.On the other hand, similar to the inside bonding of rubber coating of the steel,there is a large mismatch between the high acoustic reactance of the metal and the low acoustic reactance of the rubber, and because of the high sound attenuation of the rubber-base material,it leads to weakness of the detection signals and the difficult to thickness eigenvalue extraction.this paper presents a method of using oblique ultrasonic pulse echo in immersion to test the thickness of the rubber layer in the steel - rubber coating structure and the resonant relationship of the two detection echo as the delay time of eigenvalue, and make the eigenvalue extraction boil down to a multi-pattern recognition problem. using a self-design binary tree classifier to classify them, effectively improving the
The time domain aliasing of the ultrasonic detection signals happens when the Coating thickness is small. it results in the extraction of the thickness eigenvalue difficult, even could not be extracted.On the other hand, similar to the inside bonding of rubber coating of the steel,there is a large mismatch between the high acoustic reactance of the metal and the low acoustic reactance of the rubber, and because of the high sound attenuation of the rubber-base material,it leads to weakness of the detection signals and the difficult to thickness eigenvalue extraction.this paper presents a method of using oblique ultrasonic pulse echo in immersion to test the thickness of the rubber layer in the steel - rubber coating structure and the resonant relationship of the two detection echo as the delay time of eigenvalue, and make the eigenvalue extraction boil down to a multi-pattern recognition problem. using a self-design binary tree classifier to classify them, effectively improving the
Online since: May 2005
Authors: Hiroyuki Matsunami, Tsunenobu Kimoto, Yuki Negoro
Electrical Behavior of Implanted Aluminum and Boron near Tail Region
in 4H-SiC after High-Temperature Annealing
Yuki Negoro
a, Tsunenobu Kimoto
b and Hiroyuki Matsunamic
Department of Electronic Science and Engineering, Kyoto University, Kyotodaigaku-Katsura,
Nishikyo, Kyoto 615-8510, Japan
a
negoro@semicon.kuee.kyoto-u.ac.jp, bkimoto@kuee.kyoto-u.ac.jp,
c
matsunam@kuee.kyoto-u.ac.jp
Keywords: implantation, DLTS, ICTS, annealing, diffusion
Abstract.
Introduction Ion implantation of aluminum (Al+) and boron (B +) as well as post-implantation annealing is a key technology for SiC device processes to form selective p-type regions such as p-wells of vertical MOFETs.
Experiments The starting material was Al-doped p-type epilayers (thickness: 10 µm, Na-Nd: 6.0 x 1015 cm-3) on p-type 4H-SiC (0001) substrates.
Introduction Ion implantation of aluminum (Al+) and boron (B +) as well as post-implantation annealing is a key technology for SiC device processes to form selective p-type regions such as p-wells of vertical MOFETs.
Experiments The starting material was Al-doped p-type epilayers (thickness: 10 µm, Na-Nd: 6.0 x 1015 cm-3) on p-type 4H-SiC (0001) substrates.
Online since: October 2011
Authors: Xian Jun Zhou, Qing Wang, Zhi Liang Liu, Hong Jie Bi
Introduction
Bolt is the key part of flange joint, the adaptability of bolt can directly effect the normal operation of equipment.
Finite Element Model Fig.1 3-D model for analysis a) b) Fig.2 3-D model for two schemes a-3-D model picture with disc spring, b-3-D model picture with sleeve The basic size and material characteristics of flange model see the reference [2]; the model has two gaskets on the sides of pipe sheet, for the tube pass on top and shell pass underneath.
Ye: ANSYS Engineering Analysis Software Stress Examples (Tsinghua University Press, China 2003).
Finite Element Model Fig.1 3-D model for analysis a) b) Fig.2 3-D model for two schemes a-3-D model picture with disc spring, b-3-D model picture with sleeve The basic size and material characteristics of flange model see the reference [2]; the model has two gaskets on the sides of pipe sheet, for the tube pass on top and shell pass underneath.
Ye: ANSYS Engineering Analysis Software Stress Examples (Tsinghua University Press, China 2003).
Online since: June 2011
Authors: Fang Fu, Ning Li
International Comparison and Comprehensive Evaluation of Petroleum Industry
Ning Li a and Fang Fu b
School of Economics and Management, China University of Petroleum, Dongying, China
aliningmath@gmail.com, b fufang1009@gmail.com
Key words: International comparison; statistic data; comprehensive evaluation; DEA
Abstract.
Petroleum is also the raw material for many chemical products, including pharmaceuticals, solvents, fertilizers, pesticides, and plastics.
[3] Fenghua Hou, Zaixu Zhang, Qingzhi Liu: Application of DEA Method with Preference in Petroleum Enterprises Evaluation, Industrial Engineering Journal, No.2 (2001), p.55-59
Petroleum is also the raw material for many chemical products, including pharmaceuticals, solvents, fertilizers, pesticides, and plastics.
[3] Fenghua Hou, Zaixu Zhang, Qingzhi Liu: Application of DEA Method with Preference in Petroleum Enterprises Evaluation, Industrial Engineering Journal, No.2 (2001), p.55-59