检索结果-内蒙古大学图书馆

How to improve superlubricity performance of diketone at steel interface:Effects of oxygen gas

Friction 2023年第6期11卷 927-937页

作者： Yuanyuan JIANG Lei CHEN Chen XIAO Shumin ZHANG Chenhui ZHANG Ningning ZHOU Tao QIN Linmao QIAN Jiyang ZHANG Tribology Research Institute State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu610031China Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province Southwest Jiaotong UniversityChengdu610031China State Key Laboratory of Tribology Tsinghua UniversityBeijing100084China Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control EngineeringBeijing100094China

Achievement of steady and reliable super-low friction at the steel/steel contact interface,one of the most tribological systems applied for mechanical moving parts,is of importance for prolonging machine lifetime and reducing energy *** we reported that the superlubricity performance of the steel/steel sliding interface lubricated with tiny amounts of diketone solution strongly depends on the oxygen content in surrounding *** increase of oxygen not only significantly shortens the initial running-in time but also further reduces the stable coefficient of friction in superlubricity stage due to the enhancement of tribochemical *** the one hand,more severe oxidation wear occurring at higher oxygen content facilitates material removal of the contact interface,lowering the contact pressure and the corresponding initial *** the other hand,the growth of iron ions during the shear process in high oxygen environment promotes the formation of chelate which acted as an effective lubricated film chemisorbed at the steel/steel friction interface to further lower the interfacial *** results provide a new opportunity to further optimize the tribological performance of diketone superlubricity system,especially towards the lubrication of mechanical engineering materials.

关键词： superlubricity oxygen content steel/steel interface diketone chelate

来源：评论

学校读者我要写书评

暂无评论

Prediction of Residual Life of High Temperature and High Pressure Vessels Based on Digital Twin

引用

Science Technology and engineering 2024年第15期24卷 6320-6328页

作者： Xue, Xiang-Dong Hu, Guang-Zhong Wang, Ping Qu, Zhao-Yang School of Mechanical Engineering Sichuan University of Science & Engineering Yibin644000 China Key Laboratory of Process Equipment and Control Engineering in Sichuan Province Universities Yibin644000 China

In order to solve the difficult problem of online prediction of the remaining life of high-temperature and high-pressure vessel, a method of constructing the remaining life prediction model of high-temperature and high-pressure vessel based on digital twin was proposed. The method was based on real-time working conditions, using ANSYS simulation model for coupled simulation, obtaining a certain time-domain physical field of high-temperature and high-pressure vessel, establishing a sample dataset of remaining life prediction of high-temperature and high-pressure vessel through the multiaxial creep damage model, and using BP (back propagation) neural network algorithm optimized by Tent-SSA for training prediction, to establish a digital twin high-temperature and high-pressure vessel life prediction model driven by the fusion of the mechanism model and machine learning. Finally, the tube plate, which is a key component of a certain sodium-cooled fast reactor steam generator, was used as an object, and the experimental results show that the overall mean square error of the prediction model is reduced from 3. 219 7 × 10 - 2 before optimization to 7. 744 9 × 10 - 3, and the model is more stable, robust, and fast converging. © 2024 Beijing Kexue Jishu yu Gongcheng Zazhishe. All rights reserved.

关键词： Backpropagation

来源：评论

学校读者我要写书评

暂无评论

Influence of Riboflavin on the Corrosion of X80 Pipeline Steel by Sulfate Reducing Bacteria

SSRN

引用

SSRN 2023年

作者： Fu, Lei Lin, Li Yan, Shisen Luo, Yunrong Zhang, Yingqian Lai, Sheng Wang, Zhengguo Tan, Mingxing School of Mechanical Engineering Sichuan University of Science & Engineering Zigong643000 China Failure Mechanics and Engineering Disaster Prevention Key Lab of Sichuan Province Sichuan University Chengdu610065 China Key Laboratory of Deep Earth Science and Engineering Sichuan University Ministry of Education Chengdu610065 China School of Material Science and Engineering Sichuan University of Science & Engineering Zigong643000 China Vanadium and Titanium Resource Comprehensive Utilization Key Laboratory of Sichuan Province Panzhihua617000 China Sichuan Provincial Key Lab of Process Equipment and Control Zigong643000 China School of Civil Engineering Sichuan University of Science & Engineering Zigong643000 China

Sulfate reducing bacteria (SRB) are facultative anaerobic, and the electron transfer process of their growth and metabolic activities is as follows: the electrons released from the metal surface pass through the cell wall into the cell by extracellular electron transfer, and the electron shuttle to the body plays the role of electron transfer between cells and metals. In this study, the effect of riboflavin (RF) as an electron shuttle on SRB corrosion of X80 pipeline steel was analyzed. The results showed that the addition of 10 ppm RF to the SRB medium did not significantly change the type of corrosion products, but resulted in an enlarged corrosion pit area and an increased pit depth. The corrosion weight loss rate of the SRB + 10 ppm RF system is about 3 times that of the SRB system, and the corrosion current density of the polarization curve is about 38% higher than that of the SRB system. Therefore, RF can transfer the electrons released by iron oxidation to the cytoplasm by means of electron transfer across the cell wall, thereby accelerating the corrosion of X80 steel. This further proves that the electronic medium RF can accelerate the microbial influenced corrosion (MIC) caused by SRB. © 2023, The Authors. All rights reserved.

关键词： Electron transport properties

来源：评论

学校读者我要写书评

暂无评论

Lubrication Failure Mechanism of Rolling‑Sliding Steel Ball Against Oil-Impregnated Porous Polyimide and Bearing Steel in Double Friction Pair

SSRN

引用

SSRN 2024年

作者： Yin, Yang Shi, Pengfei Zhang, Shaohua Qing, Tao Zhou, Ningning Qian, Linmao Chen, Lei Tribology Research Institute State Key Laboratory of Rail Transit Vehicle System School of Mechanical Engineering Southwest Jiaotong University Chengdu610031 China Technology and Equipment of Rail Transit Operation and Maintenance Key Laboratory of Sichuan Province School of Mechanical Engineering Southwest Jiaotong University Sichuan Chengdu610031 China Beijing Key Laboratory of Long-life Technology of Precise Rotation and Transmission Mechanisms Beijing Institute of Control Engineering Beijing100094 China

Oil-impregnated porous polyimide (O-PPI) cages play a crucial role in aerospace bearings due to their exceptional performance and self-lubrication characteristics. However, their service life is significantly impacted by surface blackening failure. The intricate interaction among steel balls, cages, and inner/outer rings in bearing complicates the understanding of blackening mechanisms. Our study designed a novel double-contact rolling-sliding ball holder to successfully replicate the blackening phenomenon on the O-PPI surface. Experiment results indicate the iron debris generated from steel-steel friction in the second pair will infiltrate the PPI surface pores, and more importantly, the presence of Fe in iron debris efficiently catalyzes the splitting reaction of the PAO oil at the contact surface during the frictional process, leading to the distinct blackening failure phenomenon. © 2024, The Authors. All rights reserved.

关键词： Polyimides

来源：评论

学校读者我要写书评

暂无评论

Deeply Understanding Lubrication Failure of Steel Ball Against Oil-Impregnated Porous Polyimide in Double-Contact Friction with Rolling‑Sliding Motion

SSRN

引用

SSRN 2024年

Oil-impregnated porous polyimide (O-PPI) cages play a crucial role in aerospace bearings due to their exceptional performance and self-lubrication characteristics. However, their service life is significantly impacted by surface blackening behavior. The intricate interaction among steel balls, cages, and inner/outer rings in bearing complicates the understanding of blackening mechanisms. Our study designed a novel double-contact rolling-sliding ball holder to successfully replicate the blackening phenomenon on the O-PPI surface. Experiment results indicate the iron debris generated from steel-steel friction in the second pair will infiltrate the PPI surface pores, and more importantly, the presence of Fe in iron debris catalyzes the splitting reaction of the PAO oil at the contact surface during the frictional process, leading to the distinct blackening phenomenon. © 2024, The Authors. All rights reserved.

关键词： Polyimides

来源：评论

学校读者我要写书评

暂无评论

3D printing for tissue/organ regeneration in China

引用

Bio-Design and Manufacturing 2025年第2期8卷 169-242,I0001,I0002页

作者： Chaofan He Jiankang He Chengtie Wu Changshun Ruan Qi Gu Yongqiang Hao Yang Wu Shuo Bai Xiaoxiao Han Liliang Ouyang Jun Yin Hongzhao Zhou Zhuo Xiong Maobin Xie Lei Shao Jing Nie Liang Ma Cijun Shuai Changchun Zhou Xin Zhao Xuetao Shi Mengfei Yu Jiayin Fu Peng Wen Huixia Xuan Yuan Pang Yan’en Wang Yuan Sun Ziqi Gao Abdellah Aazmi Jingbo Zhang Tianhong Qiao Qixiang Yang Ke Yao Mao Mao Jianxin Hao Pinpin Wang Jirong Yang Huawei Qu Xinhuan Wang Xin Liu Shen Ji Shasha Liu Jingke Fu Bingxian Lu Mohan Wu Feng Chen Zihao Zheng Boqing Zhang Muyuan Chai Chaoying Zhang Mouyuan Sun Bo Peng Huayong Yang Yong He State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China Key Laboratory of 3D Printing Process and Equipment of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 200050China Research Center for Human Tissue and Organ Degeneration Institute of Biomedicine and BiotechnologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055China University of Chinese Academy of Sciences Beijing 100049China Key Laboratory of Organ Regeneration and Reconstruction State Key Laboratory of Membrane BiologyInstitute of ZoologyChinese Academy of SciencesBeijing 100101China Beijing Institute for Stem Cell and Regenerative Medicine Beijing 100101China Shanghai Engineering Research Center of Innovative Orthopaedic Instruments and Personalized Medicine Clinical and Translational Research Center for 3D Printing TechnologyShanghai 200011China School of Biomedical Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China State Key Laboratory of Biochemical Engineering Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China Key Laboratory of Biopharmaceutical Preparation and Delivery Institute of Process EngineeringChinese Academy of SciencesBeijing 100190China National Engineering Research Centre for High Efficiency Grinding Hunan UniversityChangsha 410082China Biomanufacturing Center Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China The Fourth Affiliated Hospital of Guangzhou Medical University Guangzhou 511436China School of Biomedical Engineering Guangzhou Medic

As surgical procedures transition from conventional resection to advanced tissue-regeneration technologies,human disease therapy has witnessed a great leap *** particular,three-dimensional(3D)bioprinting stands as a landmark in this setting,by promising the precise integration of biomaterials,cells,and bioactive molecules,thus opening up a novel avenue for tissue/organ *** by the editorial board of Bio-Design and Manufacturing,this review brings together a cohort of leading young scientists in China to dissect the core functionalities and evolutionary trajectory of 3D bioprinting,by elucidating the intricate challenges encountered in the manufacturing of transplantable *** further delve into the translational pathway from scientific research to clinical application,emphasizing the imperativeness of establishing a regulatory framework and rigorously enforcing quality-control ***,this review outlines the strategic landscape and innovative achievements of China in this field and provides a comprehensive roadmap for researchers worldwide to propel this field collectively to even greater heights.

关键词： 3D printing Bioprinting Tissue engineering Regenerative medicine

来源：评论

学校读者我要写书评

暂无评论

Soft-Landing Dynamics of a Type of Four-Legged Space Lander

SSRN

引用

SSRN 2024年

作者： Shi, Tengfei Shi, Tengfei Yang, Yinping Zhang, Zhijuan Liu, Cuicui Liu, Caishan Ma, Daolin Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and Aerospace Engineering Southwest Jiaotong University Chengdu610031 China State Key Laboratory for Turbulence and Complex Systems College of Engineering Peking University Beijing100871 China Institute of Dynamics and Control College of Mechanical Engineering and Applied Electronics Technology Beijing University of Technology Beijing100871 China China Academy of Space Technology Beijing100094 China School of Naval Architecture Ocean and Civil Engineering Shanghai Jiao Tong University Shanghai200240 China Key Laboratory of Marine Intelligent Equipment and System Ministry of Education Shanghai200240 China

Analyzing the landing dynamics response is essential for enhancing the success rate of surface explorations on Mars, the moon, or asteroids. This paper develops a comprehensive dynamics model for a space lander equipped with four sets of buffer legs, each consisting of a primary strut, two secondary struts, and a footpad, during its soft landing process. The degrees of freedom of the main body and the footpads are defined as generalized coordinates to describe the motion of the space lander. The compression force of the buffer struts is obtained by interpolating real experimental data, and the contact force between the footpad and the ground is calculated using Archimedes law for granular media. Then, the dynamical model for the lander in terms of minimal degrees of freedom can be constructed by applying the Lagrange equations of the second kind. The proposed dynamics model is validated by the experiments of a single-legged lander vertical touchdown and a four-legged lander free touchdown. Moreover, histories of buffer force, acceleration of the main body, and other key physical quantities are computed to investigate the landing process. This highly efficient and accurate dynamics model provides a method to perform extensive simulations to design and optimize a soft landing process. © 2024, The Authors. All rights reserved.

关键词： Landing

来源：评论

学校读者我要写书评

暂无评论

Study on Microstructure Evolution Mechanism of Gradient Structure Surface of Aa7075 Aluminum Alloy by Ultrasonic Surface Rolling Treatment

SSRN

引用

SSRN 2022年

作者： Fu, Lei Li, Xiulan Lin, Li Wang, Zhengguo Zhang, Yingqian Luo, Yunrong Yan, Shisen He, Chao Wang, Qingyuan School of Mechanical Engineering Sichuan University of Science & Engineering Zigong643000 China Failure Mechanics and Engineering Disaster Prevention Key Lab of Sichuan Province Sichuan University Chengdu610065 China School of Aeronautics and Astronautics Sichuan University Chengdu610065 China School of Material Science and Engineering Sichuan University of Science & Engineering Zigong643000 China Sichuan Provincial Key Lab of Process Equipment and Control Zigong643000 China School of Civil Engineering Sichuan University of Science & Engineering Zigong643000 China Institute for Advanced Materials Deformation and Damage from Multi-Scale China

The ultrasonic surface rolling treatment (USRT) was used to prepare aluminum alloy 7075 (AA7075) samples with a surface gradient structure. Microstructural evolution mechanism of the deformation layers on the gradient structure was studied by XRD, SEM, and TEM. The results show that the dislocation slip dominates the grain refinement process, and it follows the continuous cutting and refinement of dislocation cells, subgrains, and fragmentation of the second precipitates. The grain refinement on the surface layer of samples with gradient structure provides a theoretical foundation for the surface grain refinement and nanocrystallization of precipitation-strengthened aluminum alloy. © 2022, The Authors. All rights reserved.

关键词： Grain refinement

来源：评论

学校读者我要写书评

暂无评论

Influence of thermal ageing on oxidation performance and nanostructures of dry soot in diesel engine

引用

Journal of Central South University 2021年第7期28卷 2206-2220页

作者： MENG Zhong-wei LI Jian ZHANG Qian HUANG Jun-feng JIANG Yuan QIN Yuan G G CHASE FANG Jia Key Laboratory of Fluid and Power Machinery Ministry of EducationXihua UniversityChengdu 610039China Vehicle Measurement Control and Safety Key Laboratory of Sichuan ProvinceXihua UniversityChengdu 610039China Chengdu Qingzhouteji Environmental Protection Equipment Co. Ltd.Chengdu 610300China Department of Chemical and Biomolecular Engineering University of AkronAkronOH 44325-3906United States

Diesel soot subjected to high exhaust temperature suffers from thermal ageing,which is difficult to be removed by regeneration *** on the thermogravimetric(TG)analysis and images by high resolution transmission electron microscope(HRTEM),effects of thermal ageing temperature,ageing time and oxygen concentration on oxidation characteristic of soot are *** activation energy of soot increases with the increase of ageing temperature and oxygen *** activation energy increases rapidly when the ageing time is less than 45 min,and then it keeps in a value of 157 kJ/mol when the ageing time is between 45 and 60 *** to the soot without thermal ageing,the shape of ageing soot particles presents shorter diameter and more regular circle by observing soot *** the increase of ageing temperature,ageing time and oxygen concentration,the more stable structure of“shell and core”is shown in the basic *** soot has an increased fringe length,decreased tortuosity and separation distance after thermal ageing process,which leads to the deepening of the disorder degree of soot nanostructures and reduction of soot oxidation ***,the thermal ageing process should be avoided in order to optimize the active regeneration strategy.

关键词： thermal ageing oxidation performance soot nanostructure activation energy

来源：评论

学校读者我要写书评

暂无评论

Preparation and physical properties of polyethylene/carbon nanotubes/nanosilver composite 4

Preparation and physical properties of polyethylene/carbon n...

引用

2020 4th International Conference on Material Science and Technology, ICMST 2020

作者： Ge, Feifan Yao, Wei-Hua Lin, Xu Chen, Jui-Chin Jiang, Lin Tsou, Chi-Hui Material Corrosion and Protection Key Laboratory of Sichuan Province Sichuan Provincial Key Laboratory of Process Equipment and Control College of Materials Science and Engineering Sichuan University of Science and Engineering Zigong643000 China Department of Materials and Textiles Oriental Institute of Technology New Taipei City22061 Taiwan Zigong Fourth People's Hospital Zigong643000 China Sichuan Zhirenfa Environmental Protection Technology Co. Ltd. 64300 China Sichuan Zhixiangyi Technology Co. Ltd. Chengdu610051 China

In this paper, nanosilver and carbon nanotubes was melt blended with HDPE and pet respectively to prepare HDPE/CNT/nanosilver and PET/CNT/nanosilver composites with antibacterial effect. After the preparation of samples, SEM, DSC, TGA, mechanical properties and antibacterial properties were tested. The possibility of preparing new materials by this method is studied. Compared with pure HDPE, when the content of CNT/nanosilver is 0.1 phr, the tensile strength of HDPE/CNT/nanosilver composite reach to the max value. © 2020 Institute of Physics Publishing. All rights reserved.

关键词： High density polyethylenes

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：