检索结果-内蒙古大学图书馆

IEEE International Conference on control Science and Systems Engineering (CCSSE)

作者： Zikang Li Hongzhi Xu Xiuyu Zhang Feng Shu Zhi Li State Key Laboratory of Synthetical Automation for Northeastern University Shenyang China School of Automation Engineering Northeast Electric Power University China Shanghai Engineering Research Center of Ultr-Motion Control and Measurement Academy for Engineering and Technology Fudan University China

Butterfly hysteresis effects are complicated nonlinear behaviors. In comparison with single-loop hysteresis behaviors, butterfly hysteresis loops are composed of two single hysteresis loops and the directions of the butterfly hysteresis loop include both clockwise and counter-clockwise. Therefore, it brings a great challenge to build a proper model to describe the butterfly hysteresis behaviors, since most available hysteresis models are applied to describe the single-loop hysteresis. To solve this problem, a modified Bouc-Wen model with an absolute excitation function and modified elastic polynomials is developed in this paper. Experimental results are carried out via a dielectric elastomer actuator (DEA) to validate the effectiveness of the proposed model.

关键词： Conferences control systems Modeling Hysteresis Dielectric elastomer actuators

来源：评论

学校读者我要写书评

暂无评论

Study on the Wet Oxidation of an Industrial High Concentration Caprolactam Organic Wastewater

Study on the Wet Oxidation of an Industrial High Concentrati...

引用

2019 International Conference on Oil and Gas Engineering and Geological Sciences, OGEGS 2019

作者： Guo, Pengfei Wang, Li Zeng, Xu Yao, Guodong Zhou, Yangyuan Zhao, Jianfu College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resources Reuse Tongji University Shanghai China Shanghai Institute of Measurement and Testing Technology Shanghai China

In this study, wet oxidation of an industrial high concentration caprolactam organic wastewater using oxygen gas as an oxidant was investigated. Different experiments were conducted to discuss the effects of the reaction temperature, time, the initial oxygen pressure and dilution ration of raw wastewater, using a batch reactor with COD removal rate as a standard for assessing. Results show that the highest removal rate of COD, 76.6%, was obtained at 250 °C for 30 min with the oxygen pressure 1.7 MPa and dilution ration 10. The biodegradability of the wastewater improved greatly after the wet oxidation process. These results illustrated that wet oxidation with oxygen gas as an oxidant displayed effectively for the pretreatment of high concentration caprolactam organic wastewater. © 2019 IOP Publishing Ltd.

关键词： Oxidants

来源：评论

学校读者我要写书评

暂无评论

de Haas-van Alphen effect and the first-principles study of the possible topological stannide Cu3Sn

arXiv

引用

arXiv 2022年

作者： Liu, Chengxu Li, Bin Ge, Yongheng Jiao, Wen-He Xi, Chuanying Liu, Yi Xu, Chunqiang Lu, Qi Li, Yunlong Qiu, Hang-Qiang Zhu, Qin-Qing Ren, Zhi Zhu, Ziming Qian, Dong Ke, Xianglin Xu, Xiaofeng Key Laboratory of Quantum Precision Measurement of Zhejiang Province Department of Applied Physics Zhejiang University of Technology Hangzhou310023 China New Energy Technology Engineering Laboratory of Jiangsu Province School of Science Nanjing University of Posts and Telecommunications Nanjing210023 China Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education Department of Physics Synergetic Innovation Center for Quantum Effects and Applications Hunan Normal University Changsha 410081 China Anhui Province Key Laboratory of Condensed Matter Physics at Extreme Conditions High Magnetic Field Laboratory Chinese Academy of Sciences Hefei230031 China School of Physics Key Laboratory of MEMS The Ministry of Education Southeast University Nanjing211189 China Department of Physics and Astronomy Michigan State University East LansingMI48824-2320 United States Shenyang National Laboratory for Materials Science School of Physics and Astronomy Shanghai Jiao Tong University Shanghai200240 China Department of Applied Physics Zhejiang University of Science and Technology Hangzhou310023 China Key Laboratory for Quantum Materials of Zhejiang Province School of Science Westlake University Hangzhou310024 China Institute of Natural Sciences Westlake Institute for Advanced Study Hangzhou310024 China Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai200240 China

The quest for quantum materials with diverse symmetry-protected topological states has been the focus of recent research interest, primarily due to their fascinating physical properties and the potential technological utility. In this work, we report on the magnetotransport, de Haas-van Alphen (dHvA) oscillations, and the first-principles calculations of the stannide Cu3Sn that is isostructural with the recently reported topological semimetal Ag3Sn. The magnetoresistance was found to vary quasi-linearly in field. Clear dHvA oscillations were observed under a field as low as 1 Tesla at 2 K, with three major oscillation frequencies Fα=8.74 T, Fβ=150.19 T and Fγ=229.66 T and extremely small effective masses. The analysis of dHvA quantum oscillations revealed a possible nonzero Berry phase, suggestive of the nontrivial band topology. The corroborating evidence for the nontrivial electronic topology also comes from the first-principles calculations which yield a nonzero 2 topological index. These results collectively suggest that Cu3Sn, in analogy to its homologue Ag3Sn, may be another intermetallic stannide hosting topological Dirac fermions. Copyright © 2022, The Authors. All rights reserved.

关键词： Copper alloys

来源：评论

学校读者我要写书评

暂无评论

Research on the Influence of Non-Conductor on the Weight Function of Electromagnetic Flowmeter

引用

Journal of Physics: Conference Series 2021年第3期1952卷

作者： Xuejing Li Lijun Sun Shanghai Institute of Measurement and Testing Technology Shanghai 201203 China Shanghai Key Laboratory of On-line Testing and Control Technology Shanghai 201203 China School of Electrical and Information Engineering Tianjin University Tianjin 300072 China.

The demand for multiphase flow measurement is widespread in petrochemical and other fields. Due to its small size, easy maintenance, and no moving parts, electromagnetic flowmeters are widely used in single fluid measurement. With the increasing application of traditional electromagnetic flowmeters in petrochemical and other fields, the problems of traditional electromagnetic flowmeters in multiphase flow measurement applications have been discovered. How to optimize the structure of the electromagnetic flowmeter and how to improve the measurement accuracy has become a new research focus. On the basis of a large number of literature studies, this research is based on the finite element method, and systematically studies the influence of multiphase flow on the weight function of electromagnetic flowmeters. Firstly, modeling the existence of non-conductive objects in the electromagnetic flowmeter. Secondly, analyze the weight function characteristics of the non-conductive objects on the electromagnetic flowmeter from two angles of different radii and different positions. The conclusions of this study can provide a certain reference basis for the electromagnetic flowmeter in the measurement of multiphase flow.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Nanonewton-level Thrust measurement Based on Stiffness Adjustment Through Total Variation Denoising Under Heavy Loads

引用

IEEE Transactions on Instrumentation and measurement 2025年 74卷

作者： Wang, Jiabin Long, Jianfei Xu, Jiawen Wu, Mingshan Cong, Linxiao Xu, Luxiang Zheng, Yelong Wang, Bin Guo, Ning UCAS School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced Study Hangzhou 310024 China Chinese Academy of Sciences National Space Science Centre Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China University of Chinese Academy of Sciences Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Taiji Laboratory for Gravitational Wave Universe Hangzhou Institute for Advanced Study Hangzhou 310024 China University of Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences the Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Taiji Laboratory for Gravitational Wave Universe Hangzhou Institute for Advanced Study Hangzhou 310024 China Southeast University Jiangsu Key Laboratory of Remote Measurement and Control School of Instrument Science and Engineering Nanjing 210096 China University of Chinese Academy of Sciences School of Physical Sciences China University of Chinese Academy of Sciences Key Laboratory of Vacuum Physics Beijing 100049 China Tianjin University State Key Laboratory of Precision Measuring Technology and Instruments Tianjin 300072 China Chinese Academy of Sciences Innovation Academy for Microsatellites China Shanghai Engineering Center for Microsatellites Shanghai 201203 China Lanzhou Institute of Physics Science and Technology on Vacuum Technology and Physics Laboratory Lanzhou 730010 China University of Chinese Academy of Sciences School of Fundamental Physics and Mathematical Sciences Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province Taiji Laboratory for Gravitational Wave Universe Hangzhou Institute for Advanced Study Hangzhou 310024 China

Sub-micro-Newton thrusters on space satellites are widely used in spaceborne gravitational wave detection, making accurate measurement of micro-thrust-generated thrust essential. Moreover, micro-propulsion systems often exhibit substantial mass, posing challenges for thrust measurement. This research prompted the development of a sub-micro-thrust measurement device based on the inverted pendulum principle, which with-stands 8 kg loads and boasts a large thrust-to-weight ratio exceeding 109. Experimental results demonstrate that adjusting the stiffness of the inverted pendulum can effectively enhance the resolution of the device. Piecewise constant signal (PCS) thrust force was introduced, and the nonlinear total variation denoising (TVD) algorithm method was adopted for signal denoising. It is validated that thrust measurement in the range of 0–261 μN is achieved with a minimum resolution of 24 nN. The device design and stiffness adjustment method proposed in this paper, as well as the data denoising method utilized, greatly enhance the thrust resolution measurement. This approach enables the development of an accurate micro-thrust model for spaceborne gravitational wave detection missions while simultaneously offering a novel solution for sub-micro-newton-level thrust measurement under heavy load conditions. © 1963-2012 IEEE.

关键词： enhance the resolution Inverted pendulum large thrust-to-weight ratio thrust measurement total variation denoising (TVD)

来源：评论

学校读者我要写书评

暂无评论

Noise-Driven Universal Dynamics towards an Infinite Temperature State

引用

Physical Review Letters 2020年第13期124卷 130602-130602页

作者： Jie Ren Qiaoyi Li Wei Li Zi Cai Xiaoqun Wang Department of Physics and Jiangsu Laboratory of Advanced Functional Material Changshu Institute of Technology Changshu 215500 China Key Laboratory of Artificial Structures and Quantum Control Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 People’s Republic of China School of Physics Key Laboratory of Micro-Nano Measurement-Manipulation and Physics (Ministry of Education) Beihang University Beijing 100191 China Wilczek Quantum Center School of Physics and Astronomy Shanghai Jiao Tong University Shanghai 200240 China Beijing Computational Science Research Center Beijing 100193 China Shenyang National Laboratory for Materials Science and T. D. Lee Institute Shanghai Jiao Tong University Shanghai 200240 China

Dynamical universality is the observation that the dynamical properties of different systems might exhibit universal behavior that are independent of the system details. In this Letter, we study the longtime dynamics of a one-dimensional noisy quantum magnetic model, and find that even though the system is inevitably driven to an infinite temperature state, the relaxation dynamics towards such a featureless state can be highly nontrivial and universal. The effect of various mode-coupling mechanisms (external potential, disorder, interaction, and the interplay between them) as well as the conservation law on the longtime dynamics of the systems have been studied, and their relevance with current ultracold atomic experiments has been discussed.

关键词： Dissipative dynamics Dynamical phase transitions Localization

来源：评论

学校读者我要写书评

暂无评论

Classification of helicopter's typical flight state based on threshold

引用

IOP Conference Series: Materials Science and Engineering 2021年第1期1207卷

作者： Li Sheng-nan Wang Jing-lin Yang Le ZhangShang-tian Aviation Industry Group Corporation Shanghai Institute of Aeronautical Measurement and Control Technology Shanghai 201601 China. Key Laboratory of Fault Diagnosis and Health Management Science and Technology. Shanghai 201601 China.

Dividing the 37 flying state of a certain line number helicopter. Firstly, dividing the helicopter rotation and single-engine flight. Secondly, performing preliminary state division for the remaining samlpes, the specific division of yaw angle, helicopter flight altitude and indicated air speed are different states, the least squares polynomial method is used for smoothing respectively. Calculating the extreme value of each parameter data, with the difference value of the extreme value of the parameter data being less than 10 as the limiting condition, dividing the original data segment into non-turning, level flight and steady speed state. The remaining sampling points are in the state of unsteady turning and non-level flight. Taking the difference value 0 as the limiting condition, further divide the non-steady speed and non-level flight state. Dividing the state of turning and non-turning, level flight, ascent and descent, steady speed, increase speed and deceleration state, which is the preliminary division state. Finally, dividing the near-ground and non-near-ground, classifying the helicopter status according to the height threshold, and analyze the accuracy of the classification results. The results show that this method is versatile, can quickly divide helicopters with different flight complexity, and has high accuracy.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Electronic nature of chiral charge order in the kagome superconductor CsV3Sb5

引用

Physical Review B 2021年第7期104卷 075148-075148页

作者： Zhiwei Wang Yu-Xiao Jiang Jia-Xin Yin Yongkai Li Guan-Yong Wang Hai-Li Huang Sen Shao Jinjin Liu Peng Zhu Nana Shumiya Md Shafayat Hossain Hongxiong Liu Youguo Shi Junxi Duan Xiang Li Guoqing Chang Pengcheng Dai Zijin Ye Gang Xu Yanchao Wang Hao Zheng Jinfeng Jia M. Zahid Hasan Yugui Yao Centre for Quantum Physics Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100081 China Beijing Key Lab of Nanophotonics and Ultrafine Optoelectronic Systems Beijing Institute of Technology Beijing 100081 China Laboratory for Topological Quantum Matter and Advanced Spectroscopy (B7) Department of Physics Princeton University Princeton New Jersey 08544 USA School of Physics and Astronomy Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education) Shenyang National Laboratory for Materials Science Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 200240 China State Key Laboratory of Superhard Materials College of Physics Jilin University Changchun 130012 China International Center for Computational Method and Software College of Physics Jilin University Changchun 130012 China Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China University of Chinese Academy of Sciences Beijing 100049 China Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore Department of Physics and Astronomy Rice University Houston Texas 77005 USA Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan Hubei 430074 China Princeton Institute for the Science and Technology of Materials Princeton University Princeton New Jersey 08544 USA Materials Science Division Lawrence Berkeley National Laboratory Berkeley California 94720 USA Quantum Science Center Oak Ridge Tennessee 37831 USA

Kagome superconductors with TC up to 7 K have been discovered for over 40 y. Recently, unconventional chiral charge order has been reported in kagome superconductor KV3Sb5, with an ordering temperature of one order of magnitude higher than the TC. However, the chirality of the charge order has not been reported in the cousin kagome superconductor CsV3Sb5, and the electronic nature of the chirality remains elusive. In this paper, we report the observation of electronic chiral charge order in CsV3Sb5 via scanning tunneling microscopy (STM). We observe a 2 × 2 charge modulation and a 1 × 4 superlattice in both topographic data and tunneling spectroscopy. 2 × 2 charge modulation is highly anticipated as a charge order by fundamental kagome lattice models at van Hove filling, and is shown to exhibit intrinsic chirality. We find that the 1 × 4 superlattices form various small domain walls, and can be a surface effect as supported by our first-principles calculations. Crucially, we find that the amplitude of the energy gap opened by the charge order exhibits real-space modulations, and features 2 × 2 wave vectors with chirality, highlighting the electronic nature of the chiral charge order. STM study at 0.4 K reveals a superconducting energy gap with a gap size 2Δ=0.85meV, which estimates a moderate superconductivity coupling strength with 2Δ/kBTC=3.9. When further applying a c-axis magnetic field, vortex core bound states are observed within this gap, indicative of clean-limit superconductivity.

关键词： Charge density waves Density of states Electronic structure Superconducting gap Topological materials

来源：评论

学校读者我要写书评

暂无评论

Coordinated Optimization Method of Dual Head Gasoline Blending Under Strict Constraint Conditions

引用

Shiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section) 2019年第2期35卷 337-347页

作者： He, Renchu Chen, Haiquan Zhang, Weidong Zhu, Wenqi Key Laboratory of Advanced Control and Optimization Technology for Chemical Processes Ministry of Education East China University of Science and Technology Shanghai200237 China Shanghai Key Laboratory of Intelligent Manufacturing and Robotics Shanghai University Shanghai200072 China Information and Measurement Center Jinling Company SINOPEC Nanjing210033 China Storage and Transportation Department Zhenhai Refining&Chemical Company SINOPEC Ningbo315207 China

For the upcoming China Ⅵ gasoline standard with much more strictly controlled properties, and high requirements for blending efficiency, a blending process and coordinated optimization algorithm for blending multiple brands of gasoline at the same time were developed. Octane number model, vapor pressure model, density model, distillation range model and content attribute model were established. The calculation process of octane number model and distillation range model have been improved, and 12 quality indicators of gasoline can be precisely monitored during the blending process. Considering the actual accumulative blending process, the properties of gasoline in the tank during the blending process should be converted into instantaneous properties zone at the blending head. The optimized properties of the blending head are used to compensate the properties deviation of the amount of blending and the tank bottom oil. Meanwhile, a reasonable and efficient coordination optimization algorithm is used to coordinate the upper limit of the common component oil, which solves the problem of scramble for the common component oil flow in the double blending head in the blending process. The simulation results show that the design method can be applied to the gasoline blending of double head in the field, and can also provide technical support for the upgrading of gasoline blending process under the China Ⅵ gasoline standard. © 2019, Editorial Office of Acta Petrolei Sinica(Petroleum Processing Section). All right reserved.

关键词： Gasoline

来源：评论

学校读者我要写书评

暂无评论

Fault Characteristics Analysis of Planetary Gear of Helicopter Main Reducer

Fault Characteristics Analysis of Planetary Gear of Helicopt...

引用

Prognostics and System Health Management Conference (PHM-Qingdao)

作者： Liang Cao Yubin Xia Yong Shen Jinglin Wang Tianmin Shan Zeli Lin Aviation Key Laboratory of Science and Technology on Fault Diagnosis and Health Management AVIC Shanghai Aero Measurement-Controlling Research Institute Shanghai China State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjing University of Aeronautics and Astronautics Nanjing China

According to the characteristics of the large transmission ratio of the helicopter main reducer in the future, the research on the characteristic distribution of the planetary gear train of the helicopter main reducer is carried out. Because of the characteristics that the heavy load condition in helicopter main reducer's running and the changeable running state and complex and harsh climatic conditions and the increasing heat of the flow field in the reducer, by the way, the large transmission ratio increases the uncertainty of the planetary gear train operation analysis at the same time, the probability of causing a failure is greater; Especially the complex and variable structure of the helicopter which has large transmission ratio main reducer makes the analysis difficulty further. For ensuring the safety and enhancing the reliability of the helicopter, this paper make a comparative analysis of the time domain characteristics of the state signals under the multi-operating condition between the normal planetary gear and planetary gears with different degrees of failure, to explore the distribution regularity of the fault characteristics of the helicopter main reducer, so as to realize the research on fault diagnosis of helicopter large transmission ratio planetary gear.

关键词： Heating systems Fault diagnosis Uncertainty Gears Helicopters Safety Time-domain analysis

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：