检索结果-内蒙古大学图书馆

arXiv 2022年

作者： Iodice, Francesco Wu, Yuqiang Kim, Wansoo Zhao, Fei De Momi, Elena Ajoudani, Arash Genoa Italy Department of Electronics Information and Bioengineering Politecnico di Milano Milano Italy State Key Laboratory for Manufacturing System Engineering Xi'an Jiaotong University Shaanxi Xi’an China State Key Laboratory of Intelligent Robots School of Mechanical Engineering Xi'an Jiaotong University Shaanxi Xi’an China Robotics Department Hanyang University ERICA Ansan Korea Republic of

This article proposes a method for learning and robotic replication of dynamic collaborative tasks from offline videos. The objective is to extend the concept of learning from demonstration (LfD) to dynamic scenarios, benefiting from widely available or easily producible offline videos. To achieve this goal, we decode important dynamic information, such as the Configuration Dependent Stiffness (CDS), which reveals the contribution of arm pose to the arm endpoint stiffness, from a three-dimensional human skeleton model. Next, through encoding of the CDS via Gaussian Mixture Model (GMM) and decoding via Gaussian Mixture Regression (GMR), the robot's Cartesian impedance profile is estimated and replicated. We demonstrate the proposed method in a collaborative sawing task with leader-follower structure, considering environmental constraints and dynamic uncertainties. The experimental setup includes two Panda robots, which replicate the leader-follower roles and the impedance profiles extracted from a two-persons sawing video. Copyright © 2022, The Authors. All rights reserved.

关键词： Stiffness

来源：评论

学校读者我要写书评

暂无评论

Characteristics of gas-solid micro fluidized beds for thermochemical reaction analysis

引用

Carbon Resources Conversion 2020年第1期3卷 203-218页

作者： Zhennan Han Junrong Yue Xi Zeng Jian Yu Fang Wang Shaozeng Sun Hong Yao Guangqian Luo Xuejing Liu Yining Sun Fu Ding Liangliang Fu Lei Shi Kangjun Wang Jiebin Yang Shaonan Wang Xueqing Chen Dingrong Bai Guangwen Xu Key Laboratory on Resources Chemicals and Material of Ministry of Education Shenyang University of Chemical TechnologyShenyang 110142China The State Key Laboratory of Multi-phase Complex System Institute of Process EngineeringChinese Academy of ScienceBeijing 100190China Combustion Engineering Research Institute School of Energy Science and EngineeringHarbin Institute of TechnologyHarbin 150001China State Key Laboratory of Coal Combustion Huazhong University of Science and TechnologyWuhan 430074China National Institute of Measurement and Technology Chengdu 610021China

Fuel conversion and clean energy reaction systems involve a variety of catalytic and non-catalytic gas-solid thermochemical reactions.A good understanding of the correct reaction mechanism and kinetics,as well as the profiles of reaction products,is of great significance to the development,design,and operation of such reaction *** micro fluidized bed reaction analysis provides an efficient and reliable method to acquire this essential information with low capital and operating costs,low energy consumption and enhanced *** paper provides an overview of the system and its characteristics for the micro fluidized bed reaction analyzer that has been well proven to be a reliable new approach as well as an instrument for characterizing various gas-solid thermochemical reactions.

关键词： Micro fluidized bed Reaction kinetic analysis Isothermal differential reactor Thermochemical reaction characterization

来源：评论

学校读者我要写书评

暂无评论

A New Method to Reduce Energy in Trajectory Planning

A New Method to Reduce Energy in Trajectory Planning

引用

International Conference on Control, Automation and robotics (ICCAR)

作者： Jiajing Wei Minghe Jin Yechao Liu State Key Laboratory of Robotics and System Harbin Institute of Technology Harbin Heilongjiang Province China

ISBN: (数字)9781728161396

ISBN: (纸本)9781728161402

A new method to reduce energy in trajectory planning will be proposed in this paper, and it is found that it can significantly reduce the energy. The method is to smooth the planned trajectory with a well-designed low-pass filter. The low-pass filter has the ability to block high frequencies and pass the low frequencies, so it can smooth waveforms and form a chamfer-like effect at the mutation. Besides this advantages, it is found that after using a low-pass filter to handle the Cartesian trajectory, the sampling points will be denser at the beginning and end of the Cartesian space trajectory than the original trace. This change can ensure the joint angle velocity smoothly change from zero to zero, which means the trajectory will be run in a smooth state without step or shake. Using the dynamics can calculate the joint torque, then multiply the joint torque with the joint angle velocity to get the joint power. And at last, the energy consumption of every joint can be gotten by integrating the joint power. As it is concluded from the simulation result, smooth the trajectory with a well-designed low-pass filter can protect the motor and reducer and extend the life of the manipulators, and every joint energy consumption can be greatly reduced. And the reduction of energy consumption is related to the shape of the original trajectory and the cut-off frequency of the low-pass filter.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Sharing Mobilized Energy Storage for Temporal-Spatial Coordination of Transportation and Power systems

引用

Journal of Modern Power systems and Clean Energy 2024年第3期13卷 892-903页

作者： Yuhang Ding Xinjiang Chen Guangchun Ruan Gengyin Li Ming Zhou Jiang Dai Jianxiao Wang State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China State Grid Hangzhou Lin'an District Power Supply Company Hangzhou China Department of Industrial Engineering and Management College of Engineering Peking University Beijing China Laboratory for Information and Decision Systems Massachusetts Institute of Technology Cambridge MA USA Power Dispatching and Control Center Guizhou Power Grid Company Guiyang China National Engineering Laboratory for Big Data Analysis and Applications Peking University Beijing China

Mobilized energy storage (MES) can provide a variety of services for power systems, including peak shaving, frequency regulation, and congestion alleviation. In this paper, we develop an MES sharing approach based on temporal-spatial network (TSN) toward systemwide temporal-spatial flexibility enhancement, specifically in which the heavy-duty vehicles can exchange batteries at the energy storage stations connected with power grids. To achieve the temporal-spatial coordination of transportation and power systems, we propose a coordinated scheduling model. A decentralized algorithm based on the improved optimality condition decomposition (OCD) algorithm is proposed to address the information asymmetry between transportation and power systems while enhancing computational efficiency. Case studies based on IEEE 30-/118-bus and transportation systems demonstrate that MESs using the proposed approach can significantly improve the utilization of batteries while reducing operating costs by over 40% compared with stationary energy storages (SESs).

关键词： Transportation Power systems Batteries Planning Costs Power grids Uncertainty

来源：评论

学校读者我要写书评

暂无评论

Ground-state structures, electronic structure, transport properties and optical properties of Ca-based anti-Ruddlesden-Popper phase oxide perovskites

引用

Physical Review Materials 2022年第11期6卷 114601-114601页

作者： Dan Han Mao-Hua Du Menglin Huang Shizhe Wang Gang Tang Thomas Bein Hubert Ebert Department of Chemistry University of Munich Munich 81377 Germany Materials Science & Technology Division Oak Ridge National Laboratory Oak Ridge Tennessee 37831 USA State Key Laboratory of ASIC and System School of Microelectronics Fudan University Shanghai 200433 China Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 China

Anti-Ruddlesden-Popper (ARP) phase oxide perovskites Ca4OA2 (A=P, As, Sb, Bi) have recently attracted great interest in the field of ferroelectrics and thermoelectrics, whereas their optoelectronic application is limited by their indirect band gaps. In this work, we introduce A-site anion ordering in Ca4OA2 (A=P, As, Sb, Bi), and find that it induces an indirect-to-direct band gap transition. Using first-principles calculations, we study the ground-state structures, electronic structure, transport properties and optical properties of anion-ordered ARP phase oxide perovskites Ca4OAA′. Based on analyses of the lattice dynamics, the ground-state structures of Ca4OAsSb and Ca4OAsBi are identified in P4/nmm symmetry and those of Ca4OPSb and Ca4OPBi are in the I222 symmetry. In contrast to the Ruddlesden-Popper (RP) phase oxide and halide counterparts, Ca4OAA′ (AA′=PSb, PBi, AsSb, AsBi) show larger band dispersion along the out-of-plane direction, smaller band gaps and highly enhanced out-of-plane mobilities, which results from the short interlayer distances and the enhanced covalency of the pnictides. Although the out-of-plane mobilities of these n=1 ARP phase perovskites highly increase, the comparatively strong polar optical phonon scattering limits the further enhancement of their mobilities. Furthermore, compared to RP phase halide Cs2PbI2Cl2, Ca4OAA′ show strong optical absorption around the band edges, and their optical absorption coefficients can reach 105cm−1 within the visible light region due to small band gaps. This study reveals that these ARP phase oxide perovskites exhibit the potential for optoelectronic applications.

关键词： Electronic structure First-principles calculations Perovskites Semiconductor compounds

来源：评论

学校读者我要写书评

暂无评论

ELECTRO-IMPULSE DE-ICING (EIDI) TEST OF AIRCRAFT WING LEADING EDGE 22

ELECTRO-IMPULSE DE-ICING (EIDI) TEST OF AIRCRAFT WING LEADIN...

引用

22nd International Symposium on High Voltage Engineering, ISH 2021

作者： Jiang, Xingliang Chen, Yu Huang, Tingfan Wang, Maozheng Huang, Huan State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China Electric Power Science Research Institute of Guizhou Power Grid Co. Ltd Guiyang550000 China

ISBN: (纸本)9781839536052

The aircraft electro-impulse de-icing (EIDI) technology is a kind of mechanical de-icing system, which has a good application prospect. In this paper, the planar coil is wound, the discharge circuit is built, and the parameters of the discharge circuit are calculated. The EIDI model of planar aluminium plate is established. The pulse current of the coil and the electromagnetic pulse force of the leading edge are calculated by simulation. The effects of coil turns, pulse voltage and gap on the pulse action are analysed. According to the drawings of the leading edge of the aircraft, the author made the wing skin with the 6061 aluminium plate of 1.5 mm thickness, fixed the self-made coil in the skin, completed the de-icing test in the artificial climate chamber, and preliminarily verified the feasibility of the electro-impulse de-icing scheme of the leading edge of the wing. © 2021 The Institution of Engineering and technology.

关键词： Wings

来源：评论

学校读者我要写书评

暂无评论

Quantitative phase imaging through an ultra-thin lensless fiber endoscope

引用

Light(Science & Applications) 2022年第8期11卷 1843-1852页

作者： Jiawei Sun Jiachen Wu Song Wu Ruchi Goswami Salvatore Girardo Liangcai Cao Jochen Guck Nektarios Koukourakis Juergen W.Czarske Laboratory of Measurement and Sensor System Technique(MST) TU DresdenHelmholtzstrasse 1801069DresdenGermany Competence Center for Biomedical Computational Laser Systems(BIOLAS) TU DresdenDresdenGermany State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentsTsinghua University100084BeijingChina Institute for Integrative Nanosciences IFW DresdenHelmholtzstraße 2001069DresdenGermany Max Planck Institute for the Science of Light&Max-Planck-Zentrum für Physik und Medizin 91058ErlangenGermany Cluster of Excellence Physics of Life TU DresdenDresdenGermany Institute of Applied Physics TU DresdenDresdenGermany

Quantitative phase imaging(QPI)is a label-free technique providing both morphology and quantitative biophysical information in ***,applying such a powerful technique to in vivo pathological diagnosis remains ***-core fiber bundles(MCFs)enable ultra-thin probes for in vivo imaging,but current MCF imaging techniques are limited to amplitude imaging *** demonstrate a computational lensless microendoscope that uses an ultra-thin bare MCF to perform quantitative phase imaging with microscale lateral resolution and nanoscale axial sensitivity of the optical path *** incident complex light field at the measurement side is precisely reconstructed from the far-field speckle pattern at the detection side,enabling digital refocusing in a multi-layer sample without any mechanical *** accuracy of the quantitative phase reconstruction is validated by imaging the phase target and hydrogel beads through the *** the proposed imaging modality,three-dimensional imaging of human cancer cells is achieved through the ultra-thin fiber endoscope,promising widespread clinical applications.

关键词： fiber phase thin

来源：评论

学校读者我要写书评

暂无评论

MODELING METHOD OF OPLC THERMAL CIRCUIT MODEL BASED ON SUPERPOSITION PRINCIPLE 10

MODELING METHOD OF OPLC THERMAL CIRCUIT MODEL BASED ON SUPER...

引用

10th Renewable Power Generation Conference, RPG 2021

作者： Hu, Bo Wang, He Zhou, Guiping Xu, Xiangsheng State Grid Liaoning Electric Power Co. Ltd. Shenyang China Key Laboratory of Modern Power System Simulation and Control and Renewable Energy Technology Ministry of Education Northeast Electric Power University Jilin China

ISBN: (纸本)9781839536069

Optical fiber composite low-voltage cable which combines optical fiber and power cable organically plays an important role in the construction of smart grid and the development of energy internet. The change of temperature impacts the working state of the OPLC and the precision of parameter measurement. Thus, the establishment of the OPLC thermal circuit model has important practical significance. Focusing on the attributes of different kinds and various constructions of the OPLC, this paper proposes an OPLC modeling method based on the superposition principle. Firstly, the asymmetric OPLC is equivalent to several symmetric sub-models, and then each model is superimposed by superposition principle. Secondly, the particle swarm algorithm is utilized to realize the model boundary distinguishing identification, improve the accuracy of the parameters, acquire a precise thermal circuit model, and then realize the accurate calculation of temperature at different positions of OPLC. This paper establishes an OPLC thermal circuit model based on the four-cable core OPLC and proves the effectiveness of the method through simulation analysis and experimental verification. © The Institution of Engineering and technology.

关键词： Optical fibers

来源：评论

学校读者我要写书评

暂无评论

CDFI: Cross Domain Feature Interaction for Robust Bronchi Lumen Detection

CDFI: Cross Domain Feature Interaction for Robust Bronchi Lu...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： Jiasheng Xu Tianyi Zhang Yangqian Wu Jie Yang Guang–Zhong Yang Yun Gu Institute of Medical Robotics Shanghai Jiao Tong University Shanghai CHINA Institute of Image Processing and Pattern Recognition Shanghai Jiao Tong University Shanghai CHINA MOE Key Laboratory of System Control and Information Processing Shanghai P.R. China Shanghai Center for Brain Science and Brain-Inspired Technology Shanghai China

Endobronchial intervention is increasingly used as a minimally invasive means for the treatment of pulmonary diseases. In order to reduce the difficulty of manipulation in complex airway networks, robust lumen detection is essential for intraoperative guidance. However, these methods are sensitive to visual artifacts which are inevitable during the surgery. In this work, a cross domain feature interaction (CDFI) network is proposed to extract the structural features of lumens, as well as to provide artifact cues to characterize the visual features. To effectively extract the structural and artifact features, the Quadruple Feature Constraints (QFC) module is designed to constrain the intrinsic connections of samples with various imaging-quality. Furthermore, we design a Guided Feature Fusion (GFF) module to supervise the model for adaptive feature fusion based on different types of artifacts. Results show that the features extracted by the proposed method can preserve the structural information of lumen in the presence of large visual variations, bringing much-improved lumen detection accuracy.

关键词：

来源：评论

学校读者我要写书评

暂无评论

LQR control for active POGO suppression of launch vehicle

LQR control for active POGO suppression of launch vehicle

引用

第八届国际振动工程会议

作者： Wang ZHAO Jinfan LIU Shujun TAN Yuming MAO Zhigang WU State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Liaoning Key Laboratory of Aerospace Advanced Technology Dalian University of Technology Aerospace System Engineering Shanghai

To solving the problem that the traditional accumulators cannot meet the requirements for Pogo suppression of large strap-on launch vehicles, an active Pogo suppression method based on LQR controller is proposed in this paper. The active control unit model of Pogo system is established for the launch vehicle with low temperature liquid oxygen/kerosene refuel cycle engine, and then the state space model of Pogo control system is derived. Taking the minimum pump inlet pressure as the performance criterion, the LQR full states feedback controller and partial states feedback controller are designed to realize active Pogo suppression, ***, the influence of controller size and installation position on the control performance is studied. Finally, the stability analysis and time-domain simulation of the active Pogo suppression design of a certain launch vehicle are implemented. Experiment results show that the system established with the proposed method is more robust than the one established with the traditional accumulator design, and the control performance is not sensitive to the controller size and installation position, which is beneficial to engineering implementation.

关键词： POGO vibration Stability active Pogo suppression LQR robustness

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：