检索结果-内蒙古大学图书馆

development and application of magnesium alloy parts for automotive OEMs:A review

Journal of Magnesium and Alloys 2023年第1期11卷 15-47页

作者： Bo Liu Jian Yang Xiaoyu Zhang Qin Yang Jinsheng Zhang Xiaoqing Li School of Mechanical Engineering University of Science and Technology BeijingBeijing 100083China Global R&D Center Chongqing Changan Automobile Co.LtdChongqing 401120China

China is currently vigorously implementing the“energy conservation and emission reduction”and“dual carbon”*** the most resource-advantaged light metal material in China,Magnesium(Mg)alloy is progressively expanding its application in automobile,rail transportation,aerospace,medical,and electronic *** University,Shanghai Jiaotong University,and Australian National University have conducted extensive research on the preparation,properties,and processes of Mg *** the past 20 years,the proportion of Mg alloy in the automotive industry has gradually expanded,whereas currently the design and development of Mg alloy parts for automobiles has rarely been ***,the application models and typical parts cases of Mg alloy are summarized mainly from the four systems of the whole vehicle(body system,chassis system,powertrain system,interior,and exterior system).Subsequently,two actual original equipment manufacturers(OEM)cases are used to introduce the development logic of reliable die-cast Mg alloy,including forward design,formability analysis,process design analysis,structural redesign,manufacturing,and testing,aiming to share the methods,processes,and focus of attention of automotive OEMs for developing Mg alloy parts to enhance the confidence and motivation of applying Mg alloy in automotive ***,the multiple challenges faced by Mg alloy materials are sorted out and how to face these challenges are *** policies and regulations,environmental protection and energy saving,and consumer demand will continue to promote the application of Mg.

关键词： Magnesium alloy Original equipment manufacturer Automotive application development process

来源：评论

学校读者我要写书评

暂无评论

Multiphoton emission of x-rays from cooperative resonant nuclei

引用

Physical review research 2025年第1期7卷 013030-013030页

作者： Xiangjin Kong Yue Chang Lida Zhang Jianmin Yuan Yu-Gang Ma Key Laboratory of Nuclear Physics and Ion-beam Application (MOE) Institute of Modern Physics Fudan University Shanghai 200433 Peoples Republic of China Research Center for Theoretical Nuclear Physics NSFC and Fudan University Shanghai 200438 China Beijing Automation Control Equipment Institute Beijing 100074 People's Republic of China Quantum Technology R&D Center of China Aerospace Science and Industry Corporation Beijing 100074 People's Republic of China School of Physics East China University of Science and Technology Shanghai 200237 People's Republic of China Department of Physics Graduate School of China Academy of Engineering Physics Beijing 100193 Peoples Republic of China Institute of Atomic and Molecular Physics Jilin University Changchun 130012 Peoples Republic of China

The advent of x-ray free electron lasers (XFELs) has opened the door to exploring the x-ray-nuclei interaction in the multiexcitation regime. Here, we show the dependence of emission properties of x-ray photons from an ensemble of identical resonant nuclei on the number of excitations in the system, employing the theoretical methods we have introduced. Under the multiexcitation condition, the detection of x-ray quanta is emission-order selective. Our work presents an efficient approach to investigating the multiphoton emission of x-rays from cooperative resonant nuclei within and beyond weak-excitation regimes, offering valuable insights into nonlinear x-ray optics and many-body nuclear physics.

关键词： Nonlinear optics

来源：评论

学校读者我要写书评

暂无评论

development of Ti–V–Mo Complex Microalloyed Hot-rolled 900-MPa-Grade High-Strength Steel

引用

Acta Metallurgica Sinica(English Letters) 2015年第5期28卷 641-648页

作者： Ke Zhang Zhao-dong Li Xin-Jun Sun Qi-Long Yong Jun-Wei Yang Yuan-Mei Li Pei-Lin Zhao Department of Materials Science and Engineering Kunming University of Science and Technology Central Iron and Steel Research Institute Department of Materials Science and Engineering Huazhong University of Science and Technology R&D Center Laiwu Iron and Steel Group Co Ltd

A new Ti-V-Mo complex microalloyed hot-rolled high-strength steel sheet was developed by controlling a thermo-mechanical controlled processing （TMCP） schedule, in particular with variants in coiling temperature. The effects of coiling temperature （CT） on various hardening mechanisms and mechanical properties of Ti-V-Mo complex mi- croalloyed high-strength low-alloy steels were investigated. The results revealed that the steels are mainly strengthened by a combined effect of ferrite grain refinement hardening and precipitation hardening. The variation in simulated coiling temperature causes a significant difference in strength, which is mainly attributed to different precipitation hardening increment contributions. When the CT is 600 ℃, the experimental steel has the best mechanical properties： ultimate tensile strength （UTS） 1000 MPa, yield strength （YS） 955 MPa and elongation （EL） 17%. Moreover, about 82 wt% of the total precipitates are nano-sized carbide particles with diameter of 1-10 nm, which is randomly dispersed in the ferrite matrix. The nano-sized carbide particles led to a strong precipitation hardening increment up to 310 MPa.

关键词： Hot-rolled high-strength steel Strengthening mechanism Nano-sized carbide Precipitationhardening Coiling temperature

来源：评论

学校读者我要写书评

暂无评论

Stability Analysis of Underground-gas-storage Salt Cavern Based on Similarity Criterion 55

Stability Analysis of Underground-gas-storage Salt Cavern Ba...

引用

55th U.S. rock Mechanics / Geomechanics Symposium 2021

作者： dong, Jingnan Li, Guotao Liu, Tianen Li, Jingcui Zhang, Yingbin CNPC Engineering Technology R&D Company Limited Beijing China HydroChina-ITASCA R&D Center Hangzhou China

ISBN: (纸本)9781713839125

Underground gas storage using salt cavern is becoming popular due to the rising problem of the seasonal gas demand peaking. The salt cavern stability analysis is an indispensable part of the salt cavern design. The aim of the research is to study the stability of the two-well-horizontal caverns and establish the universal similarity criteria controlling the creep of the cavern. The WIPP-drucker model is investigated. The mechanical properties of the formation generally follow the geo data from Pingding Mountain. The creep simulation is performed over a period of 30 years under different and cycling cavern gas pressures simulating the gas demand peak over the whole year. The similarity criteria regarding salt cavern stability are established based on dimensional analysis. The dimensional relationships between surface subsidence, cavern volume reduction, in-situ stress, cavern gas pressure, steady-state creep rate, creep time and characteristic length of the cavern are founded. results show that the simulated cavern volume reduction due to creep corresponds to the measured real cavern volume change over years. The results also show that a total of 9 dimensional physical quantities control the whole creep system. There are 4 simple criteria and 2 composed criteria, which correspond to 6 scaling criterions. The numerical simulation results verify the accuracy of the scaling criterions. The study provides guidance to the salt cavern design and operation process in the term of the mechanical stability of the cavern. © 2021 ArMA, American rock Mechanics Association

关键词： Creep

来源：评论

学校读者我要写书评

暂无评论

High-Speed Wired drill Pipe and its Corresponding Manufacture & Test technology research

High-Speed Wired Drill Pipe and its Corresponding Manufactur...

引用

2021 Abu dhabi International Petroleum Exhibition and Conference, AdIP 2021

作者： Han, Haochen Zhang, Yong Chen, Jia Sun, Qi Fang, Zhimeng Li, Hexiang Liu, Zeng Zhang, Guobin CNPC Engineering and Technology R&D Company CNPC Materials Procurement Center

ISBN: (纸本)9781613998342

High-speed wired drill pipe and its corresponding communication technology not only can achieve high-speed transmission rate and high-capacity, but also can realize real-time monitoring and dual-way communication in whole section, which can prevent downhole problems effectively. As a series system, the homogeneity and robustness of these wired drill pipes are crucial. This paper focuses on how to overcome the difficulty in manufacturing process of information drill pipe and complete the validation test. In order to guarantee the quality of information drill pipe and satisfy the technological requirements of mass production, we optimize the manufacturing process and put forward reasonable test techniques. The optimizations of manufacturing process include the analysis on constant tension of pressure pipe, quantitative cutting pipe and perforation in pipe nozzle. The testing techniques includes magnetic coupling coil impedance test, high pressure test, communication performance test of both single pipe and series system. The test result can be judged and evaluated by the attenuation value of the signal attenuation test and the signal reflection waveform as well as sealing reliability. With the help of the optimization of the manufacturing process and the application of new tooling, the quality and robustness of information drill pipe is improved obviously. Pass rate in primary assembly is increased from 70% to 92%. After the second assembly, pass rate can be increased to 99.5%. Besides, the work efficiency is greatly improved and the process requirements of mass production are satisfied. The validation test can screen out the drill pipe with poor quality and performance effectively thus to improve the reliability of the whole system. By means of the improvement of manufacturing and the validation test, the comprehensive pass rate of information drill pipes is increased from 84% to 95%. during three field tests in Jilin and daqing Oilfield, the information drill pipes

关键词： drills

来源：评论

学校读者我要写书评

暂无评论

Pitting corrosion initiated by SiO_(2)-MnO-Cr_(2)O_(3)-Al_(2)O_(3)-based inclusions in a 304 stainless steel

引用

Journal of Iron and Steel research International 2024年第9期31卷 2281-2293页

作者： Jin-zhen Hu Shi Li Ji Zhang Ying ren Li-feng Zhang School of Metallurgical and Ecological Engineering University of Science and Technology Beijing(USTB)Beijing100083China School of Mechanical Engineering Yanshan UniversityQinhuangdao066004HebeiChina Stainless Steel R&D Center of Central R&D Institute Baoshan Iron and Steel Co.Ltd.Shanghai201900China School of Mechanical and Materials Engineering North China University of TechnologyBeijing100144China

The influence of the aluminum content on the pitting corrosion of a 304 stainless steel by a Cl−solution was *** number,area,and composition of non-metallic inclusions were modified by the addition of aluminum in the steel,which was responsible for the variation of the corrosion degree of the 304 stainless *** detection,corrosion test,electrochemical test,thermodynamic calculation,and first-principles calculation were performed to evaluate the pitting corrosion of the stainless *** initiation of the pitting corrosion by three types of inclusions,including(Mn,Si,Cr,S)O,(Mn,Al,Cr)O,and Al_(2)O_(3)were in-situ *** corroding for 880 min,the corrosion index of(Mn,Si,Cr,S)O,(Mn,Al,Cr)O,and Al_(2)O_(3)was 0.38%,0.02%,and 0.00%min−1,*** the increase in aluminum content in the steel,the pitting potential of the stainless steel was 0.131,0.304,and 0.338 V,respectively,indicating that a higher aluminum content in the steel was beneficial to improving the pitting corrosion resistance of the 304 stainless steel.

关键词： Pitting corrosion 304 stainless steel Non-metallic inclusion First-principles calculation Galvanic corrosion

来源：评论

学校读者我要写书评

暂无评论

Adaptive augmentation of gain-scheduled controller for aerospace vehicles

引用

Journal of Systems engineering and Electronics 2013年第2期24卷 272-280页

作者： Xiyuan Huang Qing Wang Yali Wang Yanze Hou Chaoyang dong School of Automation Science and Electrical Engineering Beihang University R&D Center China Academy of Launch Vehicle Technology Beijing Institute of Electronic System Engineering Institute of Manned Space System Engineering China Academy of Space Technology School of Aeronautic Science and Engineering Beihang University

This paper proposes an adaptive augmentation control design approach of the gain-scheduled *** extension is motivated by the need for augmentation of the baseline gainscheduled *** proposed approach can be utilized to design flight control systems for advanced aerospace vehicles with a large parameter *** flight dynamics within the flight envelope is described by a switched nonlinear system,which is essentially a switched polytopic system with *** flight control system consists of a baseline gain-scheduled controller and a model reference adaptive augmentation controller,while the latter can recover the nominal performance of the gainscheduled controlled system under large *** the multiple Lyapunov functions method,it is proved that the switched nonlinear system is uniformly ultimately *** validate the effectiveness of the proposed approach,this approach is applied to a generic hypersonic vehicle,and the simulation results show that the system output tracks the command signal well even when large uncertainties exist.

关键词： adaptive control gain-scheduled control flight envelope aerospace vehicle

来源：评论

学校读者我要写书评

暂无评论

Multi-scale elastoplastic mechanical model and microstructure damage analysis of solid expandable tubular

引用

Chinese Physics B 2020年第10期29卷 336-348页

作者： Hui-Juan Guo Ying-Hua Liu Yi-Nao Su Quan-Li Zhang Guo-dong Zhan Department of Engineering Mechanics AMLTsinghua UniversityBeijing 100084China Drilling Mechanical Department CNPC Engineering Technology R&D Company LimitedBeijing 102206China Drilling Technology Division EXPEC Advanced Research CenterSaudi Arabia

We present an in-depth study of the failure phenomenon of solid expandable tubular (SET) due to large expansion ratio in open holes of deep and ultra-deep wells. By examining the post-expansion SET, lots of microcracks are found on the inner surface of SET. Their morphology and parameters such as length and depth are investigated by use of metallographic microscope and scanning electron microscope (SEM). In addition, the Voronoi cell technique is adopted to characterize the multi-phase material microstructure of the SET. By using the anisotropic elastoplastic material constitutive model and macro/microscopic multi-dimensional cross-scale coupled boundary conditions, a sophisticated and multi-scale finite element model (FEM) of the SET is built successfully to simulate the material microstructure damage for different expansion ratios. The microcrack initiation and growth is simulated, and the structural integrity of the SET is discussed. It is concluded that this multi-scale finite element modeling method could effectively predict the elastoplastic deformation and the microscopic damage initiation and evolution of the SET. It is of great significance as a theoretical analysis tool to optimize the selection of appropriate tubular materials and it could be also used to substantially reduce costly failures of expandable tubulars in the field. This numerical analysis is not only beneficial for understanding the damage process of tubular materials but also effectively guides the engineering application of the SET technology.

关键词： solid expandable tubular(SET) material microstructure damage multi-scale elastoplastic model virtual failure

来源：评论

学校读者我要写书评

暂无评论

Towards better understanding of hot topics in online learning communities

引用

Smart Learning Environments 2015年第1期2卷 1-14页

作者： Li, Yanyan Zheng, Yafeng Bao, Haogang Liu, Yang R&D Center for Knowledge Engineering School of Educational Technology Beijing Normal University Beijing China

Online learning communities provide open workspaces allowing learners to share information, exchange ideas, address problems and discuss on specific themes. But with the continuously increasing artifacts in online communities, learners feel it difficult to quickly and easily gain an insight into a certain theme. To facilitate and support learners have a better understanding of the communication focus, this paper presents an approach to discover the hot topics and patterns of topics evolutions in online learning communities. Firstly, hot terms are extracted based on three features: the frequency of the terms used in the document collection;the location of the terms within a document;the breadth of terms distribution in the document collection. Then a term association network is constructed by computing the terms co-occurrence and distance between them. Finally, an algorithm is proposed to select the kernel term and its associated terms as term clusters to represent the hot topics with multi-facets expression. Two case studies on real datasets are conducted to demonstrate the effectiveness and usefulness of term cluster in helping users better understand hot topics in online learning communities. Potential applications in learning scenarios are also discussed. © 2015, Li et al.

关键词： Hot topic Online learning communities Term association network Term extraction

来源：评论

学校读者我要写书评

暂无评论

Self-adaptive vision-language model for 3d segmentation of pulmonary artery and vein

arXiv

引用

arXiv 2025年

作者： Guo, Xiaotong Yang, deqian Wang, dan Zhao, Haochen Li, Yuan Sui, Zhilin Zhou, Tao Zhang, Lijun Meng, Yanda State Key Laboratory of Computer Science Institute of Software Chinese Academy of Sciences China Department of Thoracic Surgery National Clinical Research Center for Cancer Cancer Hospital Shenzhen Hospital China School of Intelligent Science and Technology Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences Hangzhou310024 China R&D Center Guangxi Huayi Artificial Intelligence Medical Technology Co. Ltd. China School of Computer Science and Engineering Beihang University Beijing China Department of Computer Science University of Exeter Exeter United Kingdom Department of Cardiovascular & Metabolic Medicine University of Liverpool Liverpool United Kingdom Guangzhou Jiayi Software Technology Co. Ltd. China

Accurate segmentation of pulmonary structures is crucial in clinical diagnosis, disease study, and treatment planning. Significant progress has been made in deep learning-based segmentation techniques, but most require much labeled data for training. Consequently, developing precise segmentation methods that demand fewer labeled datasets is paramount in medical image analysis. The emergence of pre-trained vision-language foundation models, such as CLIP, recently opened the door for universal computer vision tasks. Exploiting the generalization ability of these pre-trained foundation models on downstream tasks, such as segmentation, leads to unexpected performance with a relatively small amount of labeled data. However, exploring these models for pulmonary artery-vein segmentation is still limited. This paper proposes a novel framework called Language-guided self-adaptive Cross-Attention Fusion Framework. Our method adopts pre-trained CLIP as a strong feature extractor for generating the segmentation of 3d CT scans, while adaptively aggregating the cross-modality of text and image representations. We propose a s pecially designed adapter module to fine-tune pre-trained CLIP with a self-adaptive learning strategy to effectively fuse the two modalities of embeddings. We extensively validate our method on a local dataset, which is the largest pulmonary artery-vein CT dataset to date and consists of 718 labeled data in total. The experiments show that our method outperformed other state-of-the-art methods by a large margin. Our data and code will be made publicly available upon acceptance. Copyright © 2025, The Authors. All rights reserved.

关键词： Visual languages

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：