检索结果-内蒙古大学图书馆

IEEE Annual Southern Power Electronics Conference (SPEC)

作者： Lincoln Moura de Oliveira Esio Eloi dos Santos Filho Gean Jacques Maia de Sousa Fernando Luiz Marcelo Antunes Edílson Mineiro Sá Junior Electrical Engineering Department Federal University of Ceara - UFC Fortaleza Brazil Electrical Engineering Department Federal University of Santa Catarina (UFSC) Florianopólis SC Brazil Chair of High-Power Converter Systems Technical University of Munich (TUM) Munich Germany Department of Control and Industrial Processes Federal Institute of Education Science and Technology of Ceará - IFCE Sobral Brazil

The neutral shift technique is a widely known method for three-phase cascaded multilevel converters working under fault conditions. This paper proposes an artificial neural network (ANN) with a custom cost function to solve equations that generate balanced line voltages when a fault occurs. Simulations using Python and TensorFlow are implemented for several fault conditions, showing the performance of the ANN for a wide range of conditions and ensuring convergence boundary conditions.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Distributed Optimization with Gradient Descent and Quantized Communication

arXiv

引用

arXiv 2022年

作者： Rikos, Apostolos I. Jiang, Wei Charalambous, Themistoklis Johansson, Karl H. Division of Decision and Control Systems KTH Royal Institute of Technology SE-100 44 Stockholm Sweden and Digital Futures StockholmSE-100 44 Sweden Department of Electrical Engineering and Automation School of Electrical Engineering Aalto University Espoo Finland Department of Electrical and Computer Engineering School of Engineering University of Cyprus Nicosia Cyprus

In this paper, we consider the unconstrained distributed optimization problem, in which the exchange of information in the network is captured by a directed graph topology, thus, nodes can only communicate with their neighbors. Additionally, in our problem, the communication channels among the nodes have limited bandwidth. In order to alleviate this limitation, quantized messages should be exchanged among the nodes. For solving this distributed optimization problem, we combine a gradient descent method with a distributed quantized consensus algorithm (which requires the nodes to exchange quantized messages and converges in a finite number of steps). Specifically, at every optimization step, each node (i) performs a gradient descent step (i.e., subtracts the scaled gradient from its current estimate), and (ii) performs a finite-time calculation of the quantized average of every node’s estimate in the network. As a consequence, this algorithm approximately mimics the centralized gradient descent algorithm. We show that our algorithm asymptotically converges to a neighborhood of the optimal solution with linear convergence rate. The performance of the proposed algorithm is demonstrated via simple illustrative examples. © 2022, CC BY.

关键词： Directed graphs

来源：评论

学校读者我要写书评

暂无评论

A Research of Digital Directional Current Protection Devices Operation Stability in Transient Modes during Single Phase to Earth Faults in 6-10 KV Networks with Isolated Neutral Point 3

A Research of Digital Directional Current Protection Devices...

引用

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

作者： Evdakov, A.E. Kutumov, Yu. D. Shadrikova, T. Yu. Shuin, V.A. Ivanovo State Power Engineering University Automatic Control of Electrical Power Systems Department Ivanovo Russia

ISBN: (纸本)9781665404631

Single phase to earth fault is the prevailing type of damage in 6-10 kV medium voltage networks. The most dangerous of single phase to earth faults is intermittent arc earth faults, which are accompanied by significant overvoltage in electrically connected network. In 6-10 kV distribution networks in the function of earth fault protection device during the impossibility of simple and sustainable zero sequence current protection devices, directional zero sequence current protection devices are commonly used. According to the data from operating experience the main disadvantage of some directional zero sequence current protection devices is refusal-to-operate possibility during internal faults and unnecessary operation during external intermittent arc faults. That is why, the research and substantiation of directional zero sequence current protection devices realization principles, which can provide high dynamic stability of protection operation is the relevant objective. The main tendency of development of relay protection equipment, including single phase to earth protection devices is associated with introduction of microprocessor technologies and digital signal processing methods. Thus, in this work the research of functioning of protection devices during transient modes is made for digital-based performance of zero sequence current protection devices. © 2020 IEEE.

关键词： Digital devices

来源：评论

学校读者我要写书评

暂无评论

Locomotion Analysis of a Modular Underactuated Snake-like Robot

Locomotion Analysis of a Modular Underactuated Snake-like Ro...

引用

IEEE International Conference on Real-time Computing and Robotics (RCAR)

作者： Zhenxuan Ma Jun Zhang Yiming Cao Zaiyang Liu Yang Tian Longchuan Li Shugen Ma Zhongkui Wang Graduate School of Science and Engineering Ritsumeikan University Kusatsu Shiga Japan Department of Robotics Ritsumeikan University Kusatsu Shiga Japan College of Information Science and Technology Beijing University of Chemical Technology Beijing China Robotics & Autonomous Systems Thrust Systems Hub The Hong Kong University of Science and Technology (Guangzhou) Guangzhou China

ISBN: (数字)9798350372601

ISBN: (纸本)9798350372618

The exploration of snake locomotion has significantly informed the field of robotics, especially in the development of robots capable of navigating complex terrains. While most robotic designs traditionally rely on the assumption of uniform force distribution for movement, the nuanced agility of snakes suggests a more selective application of force across specific joints. This paper introduces a novel underactuated snake-like robot, drawing inspiration from the adaptive locomotion strategies observed in desert snakes. We propose a modular design, incorporating joints with varying functionalities, to enhance the robot’s adaptability to diverse environmental challenges. Through simulation and experimentation on flat and inclined surfaces, we validate the effectiveness of this modular design in improving locomotive efficiency.

关键词： Navigation Force Real-time systems Robots

来源：评论

学校读者我要写书评

暂无评论

Microwave-assisted synthesis of bimetallic NiCo-MOF-74 with enhanced open metal site for efficient CO 2 capture

Environmental Functional Materials

引用

Environmental Functional Materials 2022年第3期1卷 253-266页

作者： Changwei Chen Mohammadreza Kosari Meizan Jing Chi He State Key Laboratory of Multiphase Flow in Power Engineering School of Energy and Power Engineering Xi'an Jiaotong University Xi'an 710049 Shaanxi PR China Department of Chemical and Biomolecular Engineering Faculty of Engineering National University of Singapore 10 Kent Ridge Crescent 119260 Singapore Department of Chemistry Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education Tsinghua University Beijing PR China National Engineering Laboratory for VOCs Pollution Control Material & Technology University of Chinese Academy of Sciences Beijing 101408 PR China

Metal–organic frameworks (MOFs) containing two different inorganic metal nodes (known as bimetallic MOFs) could exhibit enhanced CO 2 adsorption compared to their monometallic counterparts. Herein, a series of bimetallic NiCo-MOF-74 synthesized by microwave-assisted method were investigated for CO 2 adsorption. It was revealed that narrow micropore channel with open metal site (OMS) of the bimetallic NiCo-MOF-74 influence CO 2 binding affinity and CO 2 /N 2 adsorption. The CO 2 uptake of Ni 1 Co 1 -MOF-74 at 0 °C and 1 bar (100 kPa) was 8.30 mmol g −1 which is higher than those of Ni-MOF-74 (3.99 mmol g −1 ), Ni 6 Co 1 -MOF-74 (3.62 mmol g −1 ), Ni 1 Co 6 -MOF-74 (6.40 mmol g −1 ) and Co-MOF-74 (5.03 mmol g −1 ). While this could be related to the high specific surface area of Ni 1 Co 1 -MOF-74, Ni 1 CO 2 -MOF-74 with relatively low specific surface areas still shows good CO 2 adsorption capacity up to 5.70 mmol/g, which is higher than those of adsorbents Ni-MOF-74, Ni 6 Co 1 -MOF-74 and Co-MOF-74, indicating that adsorption performance mainly relies on coordinated metals. Ni 1 Co 1 -MOF-74 showed remarkable recyclability performance, ranking selectivity of CO 2 /N 2 reach up to 34, and suitable isosteric heat (31–23 kJ mol −1 ), manifesting a great probability for industrial CO 2 capture. As revealed, incorporated Ni 2+ /Co 2+ nodes within Ni 1 Co 1 -MOF-74, which are acting as active and open sites for CO 2 capture, led to the synergetic effects comprising of micropores as well as dense dual-metal sites.

关键词： Bimetallic metal–organic frameworks NiCo-MOF-74 Microwave-assisted synthesis Open metal site CO 2 capture

来源：评论

学校读者我要写书评

暂无评论

Real-time adaptive estimation of decoherence timescales for a single qubit

引用

Physical Review Applied 2024年第2期21卷 024026-024026页

作者： Muhammad Junaid Arshad Christiaan Bekker Ben Haylock Krzysztof Skrzypczak Daniel White Benjamin Griffiths Joe Gore Gavin W. Morley Patrick Salter Jason Smith Inbar Zohar Amit Finkler Yoann Altmann Erik M. Gauger Cristian Bonato SUPA Institute of Photonics and Quantum Sciences School of Engineering and Physical Sciences Heriot-Watt University Edinburgh EH14 4AS United Kingdom Department of Materials University of Oxford Parks Road Oxford OX1 3PH United Kingdom Department of Physics University of Warwick Coventry CV4 7AL United Kingdom Department of Engineering Science University of Oxford Parks Road Oxford OX1 3PJ United Kingdom Department of Chemical and Biological Physics Weizmann Institute of Science Rehovot 7610001 Israel Institute of Signals Sensors and Systems School of Engineering and Physical Sciences Heriot-Watt University Edinburgh EH14 4AS United Kingdom

Characterizing the time over which quantum coherence survives is critical for any implementation of quantum bits, memories, and sensors. The usual method for determining a quantum system’s decoherence rate involves a suite of experiments probing the entire expected range of this parameter, and extracting the resulting estimation in postprocessing. Here we present an adaptive multiparameter Bayesian approach, based on a simple analytical update rule, to estimate the key decoherence timescales (T1, T2∗, and T2) and the corresponding decay exponent of a quantum system in real time, using information gained in preceding experiments. This approach reduces the time required to reach a given uncertainty by a factor up to an order of magnitude, depending on the specific experiment, compared to the standard protocol of curve fitting. A further speedup of a factor approximately 2 can be realized by performing our optimization with respect to sensitivity as opposed to variance.

关键词： Open quantum systems & decoherence Quantum Fisher information Quantum coherence & coherence measures Quantum control Quantum information processing Quantum metrology Nitrogen vacancy centers in diamond Bayesian methods

来源：评论

学校读者我要写书评

暂无评论

Data-Driven Source Term Estimation of Hazardous Gas Leakages Under Variable Meteorological Conditions

SSRN

引用

SSRN 2024年

作者： Ni, Chuantao Lang, Ziqiang Wang, Bing Li, Ang Cao, Chenxi Du, Wenli Qian, Feng Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education East China University of Science and Technology Shanghai200237 China Department of Automatic Control and System Engineering University of Sheffield SheffieldS1 3JD United Kingdom

Source term estimation (STE) of hazardous gas leakages in chemical industrial parks (CIPs) is important for addressing environmental pollution and improving engineering safety and reliability. For this purpose, some least squares-based STE methods have recently been developed, which performs the real-time STE using an off-line determined response matrix that represents the relationship between the sensor measurements and strengths of hazardous gas leakages. However, these methods require the number and locations of potential hazardous gas leakage sources are known a priori, which is difficult in many practical applications. To resolve this issue, in the present study, a novel multi-sensor data-driven STE (MSDD-STE) approach is proposed, which overcomes the difficulties with existing least squares-based STE methods and can, for the first time, address the MSDD-STE problems in complicated scenarios where meteorological conditions such as wind directions change over a considerable range. A detailed analysis is introduced to evaluate the performance of the proposed approach. The effectiveness of the proposed approach is verified by comprehensive numerical simulation studies. © 2024, The Authors. All rights reserved.

关键词： Least squares approximations

来源：评论

学校读者我要写书评

暂无评论

Mini-MEndR: a miniaturized 96-well predictive assay to evaluate muscle stem cell-mediated repair

引用

BMC methods 2024年第1期1卷 5页

作者： Nitya Gulati Sadegh Davoudi Bin Xu Saifedine T Rjaibi Erik Jacques Justin Pham Amir Fard Alison P McGuigan Penney M Gilbert Department of Chemical Engineering and Applied Chemistry University of Toronto Toronto ON M5S3E4 Canada. Donnelly Centre University of Toronto Toronto ON M5S3E1 Canada. Institute of Biomedical Engineering University of Toronto Toronto ON M5S3G9 Canada. Department of Cell and Systems Biology University of Toronto Toronto ON M5S3G5 Canada.

Background:Functional evaluation of molecules that are predicted to promote stem cell mediated endogenous repair often requires in vivo transplant studies that are low throughput and hinder the rate of discovery. To offer greater throughput for functional validation studies, we miniaturized, simplified and expanded the functionality of a previously developed muscle endogenous repair (MEndR) in vitro assay that was shown to capture significant events of in vivo muscle endogenous repair. Methods:The mini-MEndR assay consists of miniaturized cellulose scaffolds designed to fit in 96-well plates, the pores of which are infiltrated with human myoblasts encapsulated in a fibrin-based hydrogel to form engineered skeletal muscle tissues. Pre-adsorbing thrombin to the cellulose scaffolds facilitates in situ tissue polymerization, a critical modification that enables new users to rapidly acquire assay expertise. Following the generation of the 3D myotube template, muscle stem cells (MuSCs), enriched from digested mouse skeletal muscle tissue using an improved magnetic-activated cell sorting protocol, are engrafted within the engineered template. Murine MuSCs are fluorescently labeled, enabling co-evaluation of human and mouse Pax7 cell responses to drug treatments. A regenerative milieu is introduced by injuring the muscle tissue with a myotoxin to initiate endogenous repair "in a dish". Phenotypic data is collected at endpoints with a high-content imaging system and is analyzed using ImageJ-based image analysis pipelines. Results:The miniaturized format and modified manufacturing protocol cuts reagent costs in half and hands-on seeding time ~ threefold, while the image analysis pipelines save 40 h of labour. By evaluating multiple commercially available human primary myoblast lines in 2D and 3D culture, we establish quality assurance metrics for cell line selection that standardizes myotube template quality. In vivo outcomes (enhanced muscle production and Pax7 cell expansio

关键词： Endogenous repair Manufacturing Predictive assay Scale-up Skeletal muscle Stem cell

来源：评论

学校读者我要写书评

暂无评论

Deep Deterministic Policy Gradient for Magnetic Levitation control 17

Deep Deterministic Policy Gradient for Magnetic Levitation C...

引用

17th International Conference on Electrical engineering/Electronics, Computer, Telecommunications and Information Technology, ECTI-CON 2020

作者： Wongsa, Sarawan Kowkasai, Nitis King Monkut's University of Technology Thonburi Department of Control Systems and Instrumentation Engineering Bangkok Thailand

ISBN: (纸本)9781728164861

MagLev ball motion control is a challenging problem because of its nonlinear and unstable behaviour. It also requires to have a large operating range. In this work, we have extended the current success of a deep reinforcement learning algorithm in continuous control using the Deep Deterministic Policy Gradient (DDPG), to magnetic levitation (MagLev) control. In reinforcement learning, the reward function is very critical for learning the optimal policy. We propose a novel and simple reward function for DDPG and evaluate our method on MagLev control. Our DDPG-based controller shows the capability to learn from the system with comparable performance to the previously proposed reward function. It can also find the solution to control the ball at all positions, including the ones that were not shown during the learning stage. © 2020 IEEE.

关键词： Reinforcement learning

来源：评论

学校读者我要写书评

暂无评论

Sub-femtonewton force sensing in solution by super-resolved photonic force microscopy (Jun, 10.1038/s41566-024-01462-7, 2024)

引用

NATURE PHOTONICS 2024年第9期18卷 998-998页

作者： Shan, Xuchen Ding, Lei Wang, Dajing Wen, Shihui Shi, Jinlong Chen, Chaohao Wang, Yang Zhu, Hongyan Huang, Zhaocun Wang, Shen S. J. Zhong, Xiaolan Liu, Baolei Reece, Peter John Ren, Wei Hao, Weichang Lu, Xunyu Lu, Jie Su, Qian Peter Chang, Lingqian Sun, Lingdong Jin, Dayong Jiang, Lei Wang, Fan Beihang University School of Physics Beijing People’s Republic of China (GRID:grid.64939.31) (ISNI:0000 0000 9999 1211) University of Technology Sydney School of Biomedical Engineering Faculty of Engineering and Information Technology Sydney Australia (GRID:grid.117476.2) (ISNI:0000 0004 1936 7611) RMIT University Centre for Atomaterials and Nanomanufacturing School of Science Melbourne Australia (GRID:grid.1017.7) (ISNI:0000 0001 2163 3550) University of Technology Sydney Institute for Biomedical Materials and Devices (IBMD) School of Mathematical and Physical Sciences Faculty of Science Sydney Australia (GRID:grid.117476.2) (ISNI:0000 0004 1936 7611) The Australian National University Australian Research Council Centre of Excellence for Transformative Meta-Optical Systems Department of Electronic Materials Engineering Research School of Physics Canberra Australia (GRID:grid.1001.0) (ISNI:0000 0001 2180 7477) Beihang University Key Laboratory of Biomechanics and Mechanobiology (Ministry of Education) Beijing Advanced Innovation Center for Biomedical Engineering School of Biological Science and Medical Engineering Beijing People’s Republic of China (GRID:grid.64939.31) (ISNI:0000 0000 9999 1211) University of Melbourne Computing and Information Systems Department Melbourne School of Engineering Melbourne Australia (GRID:grid.1008.9) (ISNI:0000 0001 2179 088X) The University of New South Wales School of Physics Sydney Australia (GRID:grid.1005.4) (ISNI:0000 0004 4902 0432) Shaanxi Normal University School of Chemistry & Chemical Engineering Xi’an People’s Republic of China (GRID:grid.412498.2) (ISNI:0000 0004 1759 8395) The University of New South Wales Particles and Catalysis Research Laboratory School of Chemical Engineering Sydney Australia (GRID:grid.1005.4) (ISNI:0000 0004 4902 0432) University of Technology Sydney Australian Artificial Intelligence Institute Faculty of Engineering and IT Sydney Australia (GRID:grid.117476.2) (ISNI:0000 0004 1936 7611) University of

Precise force measurement is critical to probe biological events and physics processes, spanning from molecular motor’s motion to the Casimir effect, as well as the detection of gravitational waves. Yet, despite extensive technological developments, the three-dimensional nanoscale measurement of weak forces in aqueous solutions still faces major challenges. Techniques that rely on optically trapped nanoprobes are of significant potential but are beset with limitations, including probe heating induced by high trapping power, undetectable scattering signals and localization errors. Here we report the measurement of the long-distance interaction force in aqueous solutions with a minimum detected force value of 108.2 ± 510.0 attonewton. To achieve this, we develop a super-resolved photonic force microscope based on optically trapped lanthanide-doped nanoparticles coupled with nanoscale three-dimensional tracking-based force sensing. The tracking method leverages neural-network-empowered super-resolution localization, where the position of the force probe is extracted from the optical-astigmatism-modified point spread function. We achieve a force sensitivity down to 1.8 fN Hz–1/2, which approaches the nanoscale thermal limit. We experimentally measure electrophoresis forces acting on single nanoparticles as well as the surface-induced interaction force on a single nanoparticle. This work opens the avenue of nanoscale thermally limited force sensing and offers new opportunities for detecting sub-femtonewton forces over long distances and biomechanical forces at the single-molecule ***-resolved photonic force microscopy employs the fluorescence of lanthanide-doped nanoparticles as a force probe, enabling the measurement of sub-femtonewton forces with a sensitivity of 1.8 fN Hz–1/2, approaching the thermal limit.

关键词： Electrophoresis

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：