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Now showing items 33 - 48 of 148

Deformation Monitoring and Evaluating Technology for Subgrade of Unballasted Track on Lan-Xin Passenger Dedicated Line

Su, Qian Zhang, Wen Chao Zhang, Li Song Zhang, Jian

Lanzhou-Xinjiang passenger dedicated line is the first high speed railway on china's northwestern Gobi where the temperature range is large and the wind is huge. Most road section of Lan-Xin passenger dedicated line is subgrade. This paper researches the ballastless track subgrade settlement observation scheme and assessment method on area where climatic conditions is harsh and geologic conditions is complex. The result shows that: the observation accuracy of subgrade settlement tests satisfies the requirement by using Layered settlement instrument, intelligent static force level and high-accuracy Hydraulic settlement instrument; Subgrade lies upon bedrock or Gobi soil with great bearing capacity in gale area, and distance between observation sections could be increased seemly. The space between observation sections generally should be less than 100m in areas where bedrock exposed, thick gravel soil distribute commonly; the distance between observation sections should be less than 50m in pre-mountain Alluvial-pluvial plain areas; hyperbolic method adapt the estimate of subgrade settlement on Gobi area, and the correlation coefficient is 0.97; Subgrade settlement deformation curve converges quickly and the settlement value after 40 days reaches 85% of ultimate settlement.

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Synthesis of Nanocrystalline AZ91 Magnesium Alloy Dispersed with 15 vol.% Submicron SiC Particles by Mechanical Milling

Su, Shitian Zhou, Jixue Tang, Shouqiu Yu, Huan Su, Qian Zhang, Suqing

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Analysis of Failure Modes and Mechanism of Subgrade under Earthquakes and Recommendations for Improving Seismic Design

Su, Qian Huang, Jun Jie Li, Shi Yu Hu, Hui Xing

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Nighttime Monitoring and Assessment Technology of Subgrade Settlement for Chengdu-Guanxian Line during Operation Period

Su, Qian Jiang, Wei Jiang, Kai Li, Yu Jie Yang, Ling Ling

The criterion for residual deformation of Substructure of ballasteless track on railway passenger dedicated line is extremely strict in order to satisfy the safety and comfort requirements of the high-speed train during operation period, urgent need to strengthen the ballastless track lines settlement deformation observation, prediction and assessment technology. Based on Chengdu-Guanxian line, this paper puts forward observation programs of subgrade settlement combined with the characteristics of Subgrade Settlement through the analysis of the influence factors of subgrade settlement deformation and key consideration about the factors of nighttime observation precision. It shows that the monitoring and assessment technology could meet the requirements through the analysis of field data, it can be guidance of railway management departments to make maintenance plan. Some advices provide reference for the monitoring and assessment of high-speed railway subgrade settlement during operation period.

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Deformation and Failure Characteristics of Embankment upon the Slope in Permafrost Area under Different Foundation Slope

Su, Qian Huang, Jun Jie Liu, Bao Li, Yu Jie

To investigate the effect of foundation slope on stability of embankment upon the slope in permafrost area, 3 groups of model tests with different foundation slope are designed using the mechanical similarity based on geotechnical centrifuge modeling, when the freezing-thawing depth of the embankment reaches the greatest. The results show that: (1) The foundation slope has effect on the stability of the embankment. The deformation mainly concentrates on the soil layers above the freezing-thawing interface, and the deformation mutation point takes place at the freezing-thawing interface. (2) According to fracture characteristics and failure severity of the embankment, failure modes can be divided into the cracking failure in shallow layer and in deep layer. (3) The cause of unstable failure is the deficiency of shear resistance strength of the weak belt, the soil layers above the freezing-thawing interface slips along the freezing-thawing interface under gravity load. (4) Under the experimental conditions, the critical value of the foundation slope influencing on the stability of the embankment is about 1:6 when the height of the slope embankment is 5.0 m.

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Computed tomography findings of small bowel gastrointestinal stromal tumors with different histologic risks of progression

Su, Qian Wang, Qian Zhang, Honglei Yu, Dexin Wang, Yanlei Liu, Zhiyan Zhang, Xiaoming

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Ionic Liquids Tailored and Confined by One-Step Assembly with Mesoporous Silica for Boosting Catalytic Conversion of CO2 into Cyclic Carbonates

Su, Qian Qi, Yaqiong Yao, Xiaoqian Cheng, Weiguo Dong, Li Chen, Songsong Zhang, Suojiang

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Boron-doped melamine-derived carbon nitrides tailored by ionic liquids for catalytic conversion of CO\r <sub/>2sub>\r into cyclic carbonates

Su, Qian Yao, Xiaoqian Cheng, Weiguo Zhang, Suojiang

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[American Society of Civil Engineers 14th COTA International Conference of Transportation Professionals - Changsha, China (July 4-7, 2014)] CICTP 2014 - A Kinematic Approach for Seismic Stability Analysis of Cantilever Retaining Wall

Su, Qian Zhang, Xiaoxi

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Probability analysis of Shanghai shallow layer subsidence : Su, H Y; Lin, G M; Qian, J H Proc 4th International Conference on Land Subsidence, Houston, 12–17 May 1991P585–592. Publ Wallingford: IAHS Press, 1991

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Microbridge testing of silicon oxide/silicon nitride bilayer films deposited on silicon wafers, by Y.-J. Su, C.-F. Qian, M.-H. Zhao and T.-Y. Zhang, originally published in Acta Materialia, Volume 48(20), pp. 4901–4915, 2000

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[American Society of Civil Engineers 11th International Conference of Chinese Transportation Professionals (ICCTP) - Nanjing, China (August 14-17, 2011)] ICCTP 2011 - Settlement Calculation of Piled Raft Foundation in Soft Soil Section of High-Speed Railway

Su, Qian Cheng, Ma-yao Wang, Bin Bai, Hao

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Microbridge testing of silicon oxide/silicon nitride bilayer films deposited on silicon wafers, by Y.-J. Su, C.-F. Qian, M.-H. Zhao and T.-Y. Zhang, originally published in Acta Materialia, Volume 48(20), pp. 4901–4915, 2000

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[IEEE 2009 WRI International Conference on Communications and Mobile Computing (CMC) - Kunming, Yunnan, China (2009.01.6-2009.01.8)] 2009 WRI International Conference on Communications and Mobile Computing - A Peer-to-Peer Resources Search Algorithm Based on Small-World Model

Su, Qian Zhang, Xuejie

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[IEEE 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) - Pisa, Italy (2015.5.11-2015.5.14)] 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings - Ultrasound attenuation characteristics in oil-water two-phase flow

Su, Qian Tan, Chao Dong, Feng

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Microstructural Evolution and Mechanical Properties in Superlight Mg-Li Alloy Processed by High-Pressure Torsion

Su, Qian Xu, Jie Li, Yugiao Yoon, Jae Ik Shan, Debin Guo, Bin Kim, Hyoung Seop

Microstructural evolution and mechanical properties of LZ91 Mg-Li alloy processed by high-pressure torsion (HPT) at an ambient temperature were researched in this paper. The microstructure analysis demonstrated that significant grain refinement was achieved after HPT processing with an average grain size reducing from 30 mu m (the as-received condition) to approximately 230 nm through 10 turns. X-ray diffraction analysis revealed LZ91 alloy was consisted of ff phase (hexagonal close-packed structure, hcp) and beta phase (body-centered cubic structure, bcc) before and after HPT processing. The mean value of microhardness increased with the increasing number of HPT turns. This significantly increased hardness of specimens can be explained by Hall-Petch strengthening. Simultaneously, the distribution of microhardness along the specimens was different from other materials after HPT processing due to the different mechanical properties of two different phases. The mechanical properties of LZ91 alloy processed by HPT were assessed by the micro-tensile testing at 298, 373, 423, and 473 K. The results demonstrate that the ultra-fine grain LZ91 Mg-Li alloy exhibits excellent mechanical properties: tensile elongation is approximately 400% at 473 K with an initial strain rate of 1 x 10(-2) s(-1).

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Deformation Monitoring and Evaluating Technology for Subgrade of Unballasted Track on Lan-Xin Passenger Dedicated Line

Synthesis of Nanocrystalline AZ91 Magnesium Alloy Dispersed with 15 vol.% Submicron SiC Particles by Mechanical Milling

Analysis of Failure Modes and Mechanism of Subgrade under Earthquakes and Recommendations for Improving Seismic Design

Nighttime Monitoring and Assessment Technology of Subgrade Settlement for Chengdu-Guanxian Line during Operation Period

Deformation and Failure Characteristics of Embankment upon the Slope in Permafrost Area under Different Foundation Slope

Computed tomography findings of small bowel gastrointestinal stromal tumors with different histologic risks of progression

Ionic Liquids Tailored and Confined by One-Step Assembly with Mesoporous Silica for Boosting Catalytic Conversion of CO2 into Cyclic Carbonates

Boron-doped melamine-derived carbon nitrides tailored by ionic liquids for catalytic conversion of CO\r <sub/>2sub>\r into cyclic carbonates

[American Society of Civil Engineers 14th COTA International Conference of Transportation Professionals - Changsha, China (July 4-7, 2014)] CICTP 2014 - A Kinematic Approach for Seismic Stability Analysis of Cantilever Retaining Wall

Probability analysis of Shanghai shallow layer subsidence : Su, H Y; Lin, G M; Qian, J H Proc 4th International Conference on Land Subsidence, Houston, 12–17 May 1991P585–592. Publ Wallingford: IAHS Press, 1991

Microbridge testing of silicon oxide/silicon nitride bilayer films deposited on silicon wafers, by Y.-J. Su, C.-F. Qian, M.-H. Zhao and T.-Y. Zhang, originally published in Acta Materialia, Volume 48(20), pp. 4901–4915, 2000

[American Society of Civil Engineers 11th International Conference of Chinese Transportation Professionals (ICCTP) - Nanjing, China (August 14-17, 2011)] ICCTP 2011 - Settlement Calculation of Piled Raft Foundation in Soft Soil Section of High-Speed Railway

Microbridge testing of silicon oxide/silicon nitride bilayer films deposited on silicon wafers, by Y.-J. Su, C.-F. Qian, M.-H. Zhao and T.-Y. Zhang, originally published in Acta Materialia, Volume 48(20), pp. 4901–4915, 2000

[IEEE 2009 WRI International Conference on Communications and Mobile Computing (CMC) - Kunming, Yunnan, China (2009.01.6-2009.01.8)] 2009 WRI International Conference on Communications and Mobile Computing - A Peer-to-Peer Resources Search Algorithm Based on Small-World Model

[IEEE 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) - Pisa, Italy (2015.5.11-2015.5.14)] 2015 IEEE International Instrumentation and Measurement Technology Conference (I2MTC) Proceedings - Ultrasound attenuation characteristics in oil-water two-phase flow

Microstructural Evolution and Mechanical Properties in Superlight Mg-Li Alloy Processed by High-Pressure Torsion

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