检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Limper, Alexander Brodersen, Anselm Zaio, Francesca Ambrosetti, Matteo Linkhorst, John Chemical Process Engineering AVT.CVT RWTH Aachen University Forckenbeckstraße 51 Aachen52074 Germany Process Engineering of Electrochemical Systems Department of Mechanical Engineering Technical University of Darmstadt Otto-Berndt-Str. 2 Darmstadt64287 Germany Politecnico di Milano Dipartimento di Energia Via Lambruschini 4 Milano20156 Italy

The adaptation of additive manufacturing for chemical flow reactors has recently gained momentum as the methods become more advanced and equipment is increasingly *** the design of periodic open cellular structures (POCS) from metal selective laser melting (SLM), structured catalyst substrates can be realized in a much more ordered fashion than well-established metal foams with a random ***, tailored transport properties are achieved and flow profiles are homogenized, eliminating flow channeling and stagnant flow zones. However, with current SLM methods, the minimal achievable feature size and therewith the specific surface area is still limited. Moreover, the size of finely resolved STL files that define the structure grows exponentially with decreasing feature sizes, further limiting the scalability of methods with direct structure definition. In this work, we present a method for implicit strucutre design by metal SLM with specific surface areas and porosities that compete with established catalyst *** definition of the microstructure is realized by control of the laser scan lines, where single scan lines create fine struts. The general applicability of our method to various metal materials is demonstrated by production from stainless steel and copper. In a numerical study for a model steam reforming application, we show that the POCS provide mass transfer coefficients and volumetric reaction rates that compete with benchmark substrates. Scan line patterning therefore provides a promising method to create highly ordered, well-scalable substrates for heterogeneous catalysis from a wide range of materials, e.g., for the application in highly efficient small-scale reactors. © 2023, The Authors. All rights reserved.

关键词： Substrates

来源：评论

学校读者我要写书评

暂无评论

Fully Automated Bi-Hormonal Intraperitoneal Artificial Pancreas Using a Two-Layer PID control Scheme

Fully Automated Bi-Hormonal Intraperitoneal Artificial Pancr...

引用

European control Conference (ECC)

作者： Jana Langholz Karim Davari Benam Bindu Sharan Sebastien Gros Anders Lyngvi Fougner Institute of Control Systems Technical University of Hamburg Eißendorfer Straße 40 Hamburg Germany Department of Engineering Cybernetics Faculty of Information Technology and Electrical Engineering Norwegian University of Science and Technology (NTNU) O. S. Bragstads Plass 2D Trondheim Norway

Treatment of type 1 diabetes mellitus is significantly improved by using commercially available hybrid closed-loop systems to deliver insulin. These systems, also called artificial pancreas (AP), use the subcutaneous (SC) route to deliver insulin. However, meal announcements are necessary due to the slow insulin absorption from the SC tissue. Thus due to the need for human intervention, it is called “hybrid closed loop” AP. In this work, a bi-hormonal AP with intraperitoneal (IP) infusion is designed to increase the time within the range of 3.9-10.0 mmol/l and alleviate the burden of meal announcements. A two-layer controller is designed to provide safe and effective insulin and glucagon delivery. The primary layer is based on classical PID controllers for insulin and glucagon, and the supervisory layer includes four parts: (A) Zone-based control settings, (B) Extrapolation of sensor data to compensate for sensor delay in SC tissue, (C) Auto-tuning of the PID parameters in the primary layer through simulation in an animal model, and (D) Safety barriers. The controller is designed to prevent hypoglycemia after meals and during physical activity, as well as prevent postprandial hyperglycemia. The designed AP achieved 92.5% of the time within the range of 3.9-10.0 mmol/l on a simulator trained on data from animal experiments. The results indicate that this two-layer control structure with IP infusions makes it feasible to achieve a fully automated artificial pancreas without the need for meal announcements, i.e. without human intervention.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A Research of Operation Stability of Overhead Transmission Lines' Relay Protection Algorithms, Which are Based on Travelling Wave Principle 3

A Research of Operation Stability of Overhead Transmission L...

引用

3rd International Youth Scientific and Technical Conference Relay Protection and Automation, RPA 2020

作者： Kutumov, Yu.D. Ivanovo State Power Engineering University Automatic Control of Electrical Power Systems Department Ivanovo Russia

ISBN: (数字)9781665404631

ISBN: (纸本)9781665404631

The characteristic of the problem, relevance of the paper. At the present time in electric power industry a concept of intelligent electrical power system is realized. A key component of this system is a digital substation. One of the main tasks of digital substation equipment is realization of effective relay protection and network automation devices. Relatively new phenomenon in this field is relay protection devices, which are based on travelling wave parameters measurement. A very important characteristic of relay protection devices (especially for extra-high voltage transmission lines of 330-750 kV) is their speed-of-response. The usage of travelling wave-based principle will allow to limit speed-of-response only by travelling wave propagation time along a protected transmission line. © 2020 IEEE.

关键词： Electric lines

来源：评论

学校读者我要写书评

暂无评论

Efficient Photocatalytic Degradation Towards Tetracycline Triggered by Z-Scheme Znsno3/Agi Composites: The Synergistic Effect of Oxygen Vacancies, Lewis Acid Sites, and Interfacial chemical Bonds

SSRN

引用

SSRN 2024年

作者： Sun, Jing Chang, Ting Liu, Qian Wang, Zhuoyue Huo, Xiaoqi Li, Meifeng Wang, Yafeng Zhao, Zhilei Zhao, Xin Wang, TingXin Liu, Jue National&Local Joint Engineering Research Center of Metrology Instrument and System College of Quality and Technical Supervision Hebei University Baoding071002 China Department of Chemical and Materials Engineering University of Alberta EdmontonT6G2R3 Canada Yunnan Provincial Key Laboratory of Soil Carbon Sequestration and Pollution Control Faculty of Environmental Science & Engineering Kunming University of Science &Technology Kunming650500 China

chemically bonded Z-scheme ZnSnO3/AgI composites rich in oxygen vacancies (OVs) and Lewis acid sites were prepared successfully and showed excellent photocatalytic activities. Especially, ZnAg-2 degraded 96.1% tetracycline under visible light irradiation for 15 min. OVs contributed to Lewis acid sites production and interfacial chemical bonds formation through weakening the metal-O bonding. Lewis acid sites favored the adsorption of electron-rich tetracycline. Interfacial chemical bonds together with Z-scheme structure accelerated electron transfer and retained the high redox ability of ZnSnO3 and AgI. OVs contributed to singlet oxygen (1O2) production through facilitating the energy transfer from triplet exciton to O2. ZnSnO3/AgI composites realized efficient removal towards tetracycline after five consecutive cycles utilization as well as in different environmental conditions and water matrices, showing practical application potential. Based on ROSs generation and photoreduction experiment, the photocatalytic mechanism of the ZnAg composites was proposed. Possible degradation pathway was deduced according to the detected main degradation intermediates. The biological toxicity in solution was reduced after tetracycline degradation. This work highlights the significant roles of OVs, Lewis acid sites, and chemical bonding in improving the photocatalytic activity of Z-scheme composites and provides new insight into designing high efficient photocatalysts for visible light induced organic pollutants removal. © 2024, The Authors. All rights reserved.

关键词： Zinc compounds

来源：评论

学校读者我要写书评

暂无评论

Dynamics-Based Trajectory Planning for Vibration Suppression of a Flexible Long-Reach Robotic Manipulator System

Dynamics-Based Trajectory Planning for Vibration Suppression...

引用

IEEE/RSJ International Conference on Intelligent Robots and systems (IROS)

作者： Anthony Siming Chen Erwin Jose Lopez Pulgarin Guido Herrmann Alexander Lanzon Joaquin Carrasco Barry Lennox Benji Carrera-Knowles John Brotherhood Tomoki Sakaue Kaiqiang Zhang Department of Electrical and Electronic Engineering Control Systems and Robotics (CSR) Group The University of Manchester Manchester United Kingdom Jacobs Warrington United Kingdom Tokyo Electric Power Company (TEPCO) Holdings Japan United Kingdom Atomic Energy Authority (UKAEA) United Kingdom

ISBN: (数字)9798350377705

ISBN: (纸本)9798350377712

We address the unique challenge of vibration suppression for a flexible long-reach robotic manipulator system, namely, the through-wall deployment (TWD) system that is used in nuclear environments. This paper proposes a novel dynamics-based trajectory optimization approach, which minimizes both the acceleration and the jerk at the manipulator’s joints, as well as the vibrations of the flexible long-reach boom where the manipulator’s base is mounted. Firstly, we create an integrated model for the system dynamics based on the knowledge of the robotic manipulator and the acceleration data from the vibration tests. We then develop an original procedure for generating the high-order polynomial trajectory that guarantees the zero-boundary condition for a flexible number of optimization parameters and waypoints. Following the simulation of a multi-objective optimization scheme, the optimized trajectory is experimentally validated on the practical TWD system with around 28% vibration reduction on average compared to the benchmark. Importantly, this reduction is achieved without compromising on the average speed of motion. The methodology is transferable to a wider range of flexible robotic manipulator systems with similar characteristics.

关键词： Vibrations Trajectory planning System dynamics Life estimation Polynomials Maintenance Robots Manipulator dynamics Trajectory optimization Intelligent robots

来源：评论

学校读者我要写书评

暂无评论

Single Proton Anti-Freezing Hydrogel Electrolyte with Enhanced Ion Migration Number Enabling High-Performance Supercapacitor

SSRN

引用

SSRN 2024年

作者： Guo, Qingqing Sun, Weigang Gao, Xiang Ma, Furui Ji, Xingxiang Gai, Ligang Liu, Libin Zheng, Zijian School of Chemistry and Chemical Engineering State Key Laboratory of Biobased Material and Green Papermaking Qilu University of Technology Shandong Academy of Sciences Jinan250353 China Department of Applied Biology and Chemical Technology Research Institute for Intelligent Wearable Systems Research Institute for Smart Energy The Hong Kong Polytechnic University Hong Kong

Compared with traditional binary ion electrolytes, single-ion electrolytes have higher ion migration number and can avoid concentration polarization. In this work, single proton hydrogel electrolytes were prepared by one-step free radical polymerization of acrylamide and 2-acrylaminoamido-2-methyl-1-propane sulfonic acid in ethylene glycol (EG)/water binary solvent. The electrolyte possesses good mechanical strength and excellent anti-freezing ability. A high conductivity of 1.28 mS cm-1 at -40 oC is achieved by adjusting monomer ratio and EG content. The proton hopping along the ion channel formed by the anionic polymer chain and the Grotthuss transport are responsible for the high conductivity. An extremely high ion migration number of 0.87 is obtained. The fixed anionic group endows the hydrogel electrolyte with good anticorrosion ability. The hydrogel electrolyte assembled supercapacitor (SC) exhibits excellent electrochemical performance in a wide temperature range from -40 °C to 60 °C and can be stored at -30 °C for 10 months without capacitance attenuation. The capacitance retention rate of the SC is as high as 92% after 15,000 cycles at both room temperature and -40 °C. The single proton hydrogel electrolyte provides a new route for the further development of storage device based proton transport. © 2024, The Authors. All rights reserved.

关键词： Supercapacitor

来源：评论

学校读者我要写书评

暂无评论

Research on intrusion detection of industrial control system based on improved QPSO-SVM

Research on intrusion detection of industrial control system...

引用

2022 International Conference on Electronic Information Technology, EIT 2022

作者： Yu, Yajie Liu, Xianda Wei, Weixuan Chen, Hengfei Key Laboratory of Networked Control Systems Chinese Academy of Sciences Shenyang110016 China Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang110169 China University of Chinese Academy of Sciences Beijing100049 China College of Information Engineering Shenyang University of Chemical Technology Shenyang110142 China

ISBN: (纸本)9781510655096

Intrusion detection technology can effectively evaluate the security state of the system. However, the accuracy of traditional intrusion detection methods still needs to be improved. Therefore, this paper proposed a SVM model based on improved QPSO. QPSO is used to optimize the hyperparameters of SVM to improve its accuracy. In addition, the shrinkage expansion coefficient in QPSO is improved to make QPSO adaptive. Experiment shows that the proposed algorithm has good performance. © 2022 SPIE. All rights reserved.

关键词： Intrusion detection

来源：评论

学校读者我要写书评

暂无评论

THE YAKUBOVICH S-LEMMA REVISITED: STABILITY AND CONTRACTIVITY IN NON-EUCLIDEAN NORMS

arXiv

引用

arXiv 2022年

作者： Proskurnikov, Anton V. Davydov, Alexander Bullo, Francesco Department of Electronics and Telecommunications Politecnico di Torino Turin Italy Department of Mechanical Engineering The Center for Control Dynamical Systems and Computation University of California Santa Barbara United States

The celebrated S-Lemma was originally proposed to ensure the existence of a quadratic Lyapunov function in the Lur'e problem of absolute stability. A quadratic Lyapunov function is, however, nothing else than a squared Euclidean norm on the state space (that is, a norm induced by an inner product). A natural question arises as to whether squared non-Euclidean norms V (x) = ǁxǁ2 may serve as Lyapunov functions in stability problems. This paper presents a novel non-polynomial S-Lemma that leads to constructive criteria for the existence of such functions defined by weighted p norms. Our generalized S-Lemma leads to new absolute stability and absolute contractivity criteria for Lur'e-type systems, including, for example, a new simple proof of the Aizerman and Kalman conjectures for positive Lur'e *** Codes 34H05, 93C15 Copyright © 2022, The Authors. All rights reserved.

关键词： Lyapunov functions

来源：评论

学校读者我要写书评

暂无评论

A Survey on Robotic Manipulation of Deformable Objects: Recent Advances, Open Challenges and New Frontiers

arXiv

引用

arXiv 2023年

作者： Gu, Feida Zhou, Yanmin Wang, Zhipeng Jiang, Shuo He, Bin Shanghai Research Institute for Intelligent Autonomous Systems Tongji University Shanghai201804 China National Key Laboratory of Autonomous Intelligent Unmanned Systems Shanghai201210 China The Frontiers Science Center for Intelligent Autonomous Systems Shanghai200120 China The Department of Control Science and Engineering Tongji University Shanghai201804 China

Deformable object manipulation (DOM) for robots has a wide range of applications in various fields such as industrial, service and health care sectors. However, compared to manipulation of rigid objects, DOM poses significant challenges for robotic perception, modeling and manipulation, due to the infinite dimensionality of the state space of deformable objects (DOs) and the complexity of their dynamics. The development of computer graphics and machine learning has enabled novel techniques for DOM. These techniques, based on data-driven paradigms, can address some of the challenges that analytical approaches of DOM face. However, some existing reviews do not include all aspects of DOM, and some previous reviews do not summarize data-driven approaches adequately. In this article, we survey more than 150 relevant studies (data-driven approaches mainly) and summarize recent advances, open challenges, and new frontiers for aspects of perception, modeling and manipulation for DOs. Particularly, we summarize initial progress made by Large Language Models (LLMs) in robotic manipulation, and indicates some valuable directions for further research. We believe that integrating data-driven approaches and analytical approaches can provide viable solutions to open challenges of DOM. Impact Statement-The manipulation of deformable objects is very common in industry or daily life. The applications of deformable object manipulation in industry can create enormous economic benefits, and the applications in daily life can improve quality of life, especially for people with disabilities and the elderly. Robotic manipulation tasks such as food handling, assistive dressing or clothing folding require open problems of perception, modeling and manipulation of deformable objects to be solved. Recent advances in machine learning have addressed some of the limitations of traditional approaches. Combining analytical and data-driven approaches holds the potential to bring the manipulation capa

关键词： Machine learning

来源：评论

学校读者我要写书评

暂无评论

OA-ECBVC: A Cooperative Collision-free Encirclement and Capture Approach in Cluttered Environments

arXiv

引用

arXiv 2023年

作者： Wang, Xinyi Ding, Yulong Chen, Yizhou Han, Ruihua Xi, Lele Chen, Ben M. The Department of Mechanical and Automation Engineering The Chinese University of Hong Kong N.T. Shatin Hong Kong The Department of Control Science and Engineering Tongji University Shanghai China The Frontiers Science Center for Intelligent Autonomous Systems Ministry of Education China Department of Computer Science The University of Hong Kong Hong Kong Hebei University of Science and Technology Shijiazhuang China

This article investigates the practical scenarios of chasing an adversarial evader in an unbounded environment with cluttered obstacles. We propose a Voronoi-based decentralized algorithm for multiple pursuers to encircle and capture the evader by reacting to collisions. An efficient approach is presented for constructing an obstacle-aware evader-centered bounded Voronoi cell (OA-ECBVC), which strictly ensures collision avoidance in various obstacle scenarios when pursuing the evader. The evader can be efficiently enclosed in a convex hull given random initial configurations. Furthermore, to cooperatively capture the evader, each pursuer continually compresses the boundary of its OA-ECBVC to quickly reduce the movement space of the evader while maintaining encirclement. Our OA-ECBVC algorithm is validated in various simulated environments with different dynamic systems of robots. Real-time performance of resisting uncertainties shows the superior reliability of our method for deployment on multiple robot platforms. Copyright © 2023, The Authors. All rights reserved.

关键词：

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：