检索结果-内蒙古大学图书馆

3rd International Conference on robotics and Control Engineering, robCE 2023

作者： Liu, Jia Gu, Qiyao Chen, dapeng School of Automation C-IMER Nanjing University of Information Science & Technology Jiangsu Nanjing China

ISBN: (纸本)9781450398107

The current hand rehabilitation training implemented through augmented reality technology has shown the potential to enhance user engagement. However, it falls short in realizing the virtual and realistic occlusion effect, or in producing realistic edge processing of virtual and realistic occlusion. This fragmentation between virtual objects and the real world poses a significant challenge. In light of this, this paper proposes a method that utilizes SLAM to achieve more accurate and realistic voxel occlusion and interaction effects during hand rehabilitation training. The method begins with acquiring dense point cloud data, which is voxelized by SLAM with dynamic removal. Corresponding objects are then segmented using OPTICS clustering for voxel edge constraint. Next, a second thread is initiated to reconstruct the dense point cloud prediction, leveraging local map semantic information combined with the edge SdF algorithm for the input 3d point cloud. By combining the predicted point cloud with the voxel segmented edges, the edge points are updated, and new edge surfaces are fitted to improve the accuracy and shapeliness of the 3d segmented object edges. The feasibility and accuracy of the algorithm are verified using datasets and real-time experiments. Finally, the paper presents an interactive system for hand rehabilitation training with virtual and real occlusion. © 2023 ACM.

关键词： Augmented reality

来源：评论

学校读者我要写书评

暂无评论

Study on Optimized Grid Voltage Feedforward Approach with QPr-Based Active damping

Study on Optimized Grid Voltage Feedforward Approach with QP...

引用

2023 IEEE International Conference on Applied Superconductivity and Electromagnetic devices, ASEMd 2023

作者： Sun, Qiang Zhao, Lingzhi Miao, Yongli Wang, Li Gao, Shuang Xu, Jiacheng Wei, Kexin Tianjin Agricultural University College of Engineering and Technology Tianjin China Tianjin University Key Lab of Ministry of Education on Smart Power Grids Tianjin China

ISBN: (纸本)9798350301571

The grid-connected power converter based on LCL topology could effectively restrain the line current harmonic of high-frequency switching, but the third-order structure usually produces resonance, which would lead to system instability. Through grid current feedback along with active damping, the resonance peak in LCL topology can be actively suppressed without adding additional sensors. due to the reduction of feedback state quantity, the system is prone to oscillation when the grid voltage contains harmonic components, which reduces the anti-interference ability of the power converter. The optimized grid voltage full feedforward approach based on QPr controller with active damping is proposed to decline THd value of grid-connected current under the fluctuation of line voltage, and the experimental results validate the feasibility and correctness, in which the system reaches the unity power factor with well transient performance. © 2023 IEEE.

关键词： Grid voltage feedforward Power converter Quasi proportional resonant

来源：评论

学校读者我要写书评

暂无评论

"Atomic Topping" of MnO x on Al2O3 to Create Electron-rich, Aperiodic, Lattice Oxygens that resemble Noble Metals for Catalytic Oxidation

引用

JOUrNAL OF THE AMErICAN CHEMICAL SOCIETY 2024年第24期146卷 16549-16557页

作者： Gan, Tao Chen, Xin Chu, Xuefeng Jing, Pei Shi, Shaozhen Zhang, Zedong Zhang, Wenxiang Li, Jiong Zhang, Shuo Pavanello, Michele Wang, dayang Liu, Gang Jilin Univ Coll Chem State Key Lab Inorgan Synth & Preparat Chem Changchun 130012 Peoples R China Chinese Acad Sci Shanghai Adv Res Inst Shanghai Synchrotron Radiat Facil Shanghai 201204 Peoples R China Rutgers State Univ Dept Chem Dept Phys Newark NJ 07102 USA Jilin Jianzhu Univ Sch Elect & Elect Informat Engn Jilin Prov Key Lab Architectural Elect & Comprehen Changchun 130118 Peoples R China Tsinghua Univ Dept Chem Beijing 100084 Peoples R China

Enhancing the catalytic oxidation activity of traditional transition-metal oxides to rival that of noble metals has been a prominent focus in the field of catalysis. However, existing synthesis strategies that focus on controlling the electronic states of metal centers have not yet fully succeeded in achieving this goal. Our current research reveals that manipulating the electronic states of oxygen centers can yield unexpected results. By creating electron-rich, aperiodic lattice oxygens through atomic topping of MnOx, we have produced a catalyst with performance that closely resembles supported Pt. Spherical aberration-corrected transmission electron microscopy and X-ray absorption spectra have confirmed that the atomic topping of the MnOx layer on Al2O3 can form an aperiodic arrangement oxide structure. Near-ambient pressure X-ray photoelectron spectroscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy, reaction kinetics test, and theoretical calculations demonstrated that this structure significantly increases the electron density around the oxygen in MnOx, shifting the activation center for CO adsorption from Mn to O, thereby exhibiting catalytic activity and stability close to that of the precious metal Pt. This study presents a fresh perspective on designing efficient oxide catalysts by targeting electron-rich anionic centers, thereby deepening the understanding of how these centers can be altered to enhance catalytic efficiency in oxidation reactions.

关键词： Adsorption Catalysts Oxides Oxygen Transition metals

来源：评论

学校读者我要写书评

暂无评论

UN BIASEd STO CH ASTIC PrOX IM A L SO LV Er FO r GrA PH NEU rA L NETWO rK S W ITH EQU ILIBrIUM STATES 11

UN BIASED STO CH ASTIC PROX IM A L SO LV ER FO R GRA PH NEU ...

引用

11th International Conference on Learning representations, ICLr 2023

作者： Li, Mingjie Wang, Yifei Wang, Yisen Lin, Zhouchen National Key Lab of General Artificial Intelligence School of Intelligence Science and Technology Peking University China School of Mathematical Sciences Peking University China Institute for Artificial Intelligence Peking University China Peng Cheng Laboratory China

Graph Neural Networks (GNNs) are widely used deep learning models that can extract meaningful representations from graph datasets and achieve great success in many machine learning tasks. Among them, graph neural networks with iterative iterations like unfolded GNNs and implicit GNNs can effectively capture long-range dependencies in graphs and demonstrate superior performance on large graphs since they can mathematically ensure its convergence to some nontrivial solution after lots of aggregations. However, the aggregation time for such models costs a lot as they need to aggregate the full graph in each update. Such weakness limits the scalability of the implicit graph models. To tackle such limitations, we propose two unbiased stochastic proximal solvers inspired by the stochastic proximal gradient descent method and its variance reduction variant called USP and USP-Vr solvers. From the point of stochastic optimization, we theoretically prove that our solvers are unbiased, which can converge to the same solution as the original solvers for unfolded GNNs and implicit GNNs. Furthermore, the computation complexities for unfolded GNNs and implicit GNNs with our proposed solvers are significantly less than their vanilla versions. Experiments on various large graph datasets show that our proposed solvers are more efficient and can achieve state-of-the-art performance. © 2023 11th International Conference on Learning representations, ICLr 2023. All rights reserved.

关键词： Graph neural networks

来源：评论

学校读者我要写书评

暂无评论

Simulating the effect of wind erosion on aeolian desertification process of Horqin sandy land and its significance on material cycle:a wind tunnel study

引用

research in Cold and Arid regions 2022年第1期14卷 43-53页

作者： CaiXia Zhang JinChang Li Key Laboratory of Desert and Desertification Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouGansu 730000China Shanxi Laboratory for Yellow River Institute of Loess PlateauShanxi UniversityTaiyuanShanxi 030006China

Samples from the Horqin sandy land were exposed to a series of wind velocities,and sink particles were collected at the end of the diffusion section of a wind *** sizes of collected samples show great variation because of the granularity difference of the surface *** original samples show lower average content of SiO_(2) and higher average content of Al _(2)O_(3),Fe_(2)O_(3),MgO,CaO,Na_(2)O,and K_(2)O than collected *** with other dust source areas in China,the Horqin sandy land had higher content of Zr,Ba,SiO_(2),Al_(2)O_(3) and K_(2)*** with the average upper continental crust(UCC)composition,surface samples were rich in the content of Y,Zr,Nb,Ba,La,*** characteristics of fine grain components of the Horqin sandy land differ from those from other dust source regions,because fine-grained particles in the Horqin sandy land were mostly derived from various local deposits formed in its unique depositional environments influenced by several tectonic activities.

关键词： sink sand wind erosion aeolian process Horqin sandy land

来源：评论

学校读者我要写书评

暂无评论

CeO2-Pt Synergistic Electrocatalysts for Enhanced Phosphoric Acid Tolerance in High-Temperature PEM Fuel Cells

引用

ENErGY & FUELS 2025年第20期39卷 9585-9592页

作者： Cao, Jingwen Shu, Chengyong Gan, Zhuofan Chen, Zhixu Qiu, Peixi Bai, Jiangyun Tang, Wei Xi An Jiao Tong Univ Sch Chem Engn & Technol Xian 710049 Peoples R China Xi An Jiao Tong Univ Natl Innovat Platform Ctr Ind Educ Integrat Energy Xian 710049 Peoples R China

In high-temperature proton exchange membrane fuel cells (HT-PEMFCs), phosphoric acid (PA) facilitates proton conduction. However, phosphate ions can form strong bonds with the Pt surface through Pt-O bonds, leading to the poisoning of the Pt active sites on the catalyst. This ultimately causes catalyst deactivation and slows the oxygen reduction reaction (Orr) kinetics. In this study, we prepared a carbon-cerium oxide (C-CeO2) composite support through rotary evaporation and calcination. Subsequently, Pt nanoparticles supported on the C-CeO2 composite were synthesized using the conventional ethylene glycol reduction method, yielding excellent resistance to PA. In the C-CeO2-Pt catalyst, the synergistic interaction between CeO2 and Pt effectively alters the electronic structure of Pt, thereby weakening the adsorption energy of phosphate ions on the catalyst surface. Additionally, the introduction of CeO2 significantly enhances the metal-support interaction and suppresses the agglomeration of Pt particles. This promotes a uniform distribution of nanoparticles and prevents catalyst separation and aggregation during the accelerated durability test (AdT) process. results from phosphate poisoning tests using room-temperature rotating disk electrode analysis indicate that the C-CeO2-Pt catalyst exhibits exceptional phosphate tolerance, superior Orr activity, and excellent stability. Under a H2-O2 atmosphere, the HT-PEMFCs assembled with C-CeO2-Pt electrocatalysts achieved a peak power density of 603.78 mW cm-2 at a low platinum loading of 0.3 mgPt cm-2. This study offers a novel approach for designing phosphate-tolerant electrocatalysts for HT-PEMFCs.

关键词： Electrolytic reduction

来源：评论

学校读者我要写书评

暂无评论

On the Existence of Parameterized Algorithms for the Shortest Common Supersequence and related Problems 18th

On the Existence of Parameterized Algorithms for the Sho...

引用

18th International Conference on Algorithmic Aspects in Information and Management, AAIM 2024

作者： Chen, Muzhou Jiang, Haitao Liu, Nan Wang, Lusheng Zhu, Binhai Gianforte School of Computing Montana State University BozemanMT59717 United States School of Computer Science and Technology Shandong University Qingdao China School of Computer Science and Technology Shandong Jianzhu University Jinan China Department Computer Science City University of Hong Kong Hong Kong

ISBN: (纸本)9789819778003

Shortest Common Supersequence (SCS) is a well-known problem in string algorithms and related applications. For multiple input sequences the problem is NP-hard and for a fixed number of d input sequences it can be solved in O(nd) time, where n is the maximum length of the input sequences. In this paper, we consider designing parameterized algorithms or proving the non-existence of these algorithms for SCS and several of its variants. Given a sequence S of length n, compute the shortest cubic supersequence of S, i.e., in the form of X3 and with the shortest length, where S is a subsequence of X3. We show that if |X|=n/3+, then the problem can be solved in O(2n3) time, which beats the trivial O(n5) bound when =o(n).For the general SCS problem with multiple input sequences, if k is the length of the optimal solution then we present an FPT algorithm running in O∗(kk) *** a general SCS instance M={S1,...,Sm}, where S1 is the longest among Si’s, if the parameter p is the number of positions in S1 where one could insert letters to obtain a SCS for M, then we prove that there is no FPT algorithm parameterized on p unless P = *** a set of strings {S1,...,Sm}, an integer q and an extra string T such that each Si,1≤i≤m, is a subsequence of T, we show that deciding if there are k disjoint substrings of T, say T1,T2,...,Tk, such that ∑j∈[k]|Tj|≤q, each Si is a subsequence of some Tj, for 1≤i≤m and 1≤j≤k, is NP-complete. In fact, if the problem is parameterized by k, then it is even W[1]-hard. Given a sequence S of length n, compute the shortest cubic supersequence of S, i.e., in the form of X3 and with the shortest length, where S is a subsequence of X3. We show that if |X|=n/3+, then the problem can be solved in O(2n3) time, which beats the trivial O(n5) bound when =o(n). For the general SCS problem with multiple input sequences, if k is the length of the optimal solution then we present an FPT algorithm running in O∗(kk) time. Given a general SCS instance M={S1,...,

关键词： Parameterization

来源：评论

学校读者我要写书评

暂无评论

recent progress and future prospects for mechanized harvesting of fruit crops with shaking systems

引用

International Journal of Agricultural and Biological Engineering 2023年第1期16卷 1-13页

作者： Yingjun Pu Shuming Wang Fuzeng Yang reza Ehsani Lijun Zhao Chengsong Li Shouyong Xie Mingjin Yang College of Engineering and Technology Southwest UniversityChongqing 400715China Chongqing Key Laboratory of Agricultural Equipment for Hilly and Mountainous Regions Chongqing 400715China Key Laboratory of Horticulture Science for Southern Mountains Regions of Ministry of Education College of Horticulture and LandscapeArchitectureSouthwest UniversityChongqing 400716China College of Mechanical and Electronic Engineering Northwest A&F UniversityYangling 712100ShaanxiChina School of Engineering University of CaliforniaMercedCA 95343USA

Mechanized harvesting technologies with shaking systems for fruit industry have been widely investigated and significantly developed over the past several decades which were presented by a large amount of *** paper reviews the research and development progress of mechanized harvesting of fruits systematically with a focus on the theoretical study,fruit crop variety,shaking system categories,abscission chemical agents,and their actual *** on the comprehensive review,mechanized harvesting systems for different fruit crops appear multifarious shaking modes with various vibratory mechanisms and structural *** advantages in the development of fruit mechanical harvesting with effective vibratory patterns and catching frames provide a series of economic and agronomic benefits,such as reducing labor costs,promoting standardized planting,and increasing ***,fruit injury and tree damage are the main reasons why mechanical shaking systems are rarely used for fresh fruit harvesting because of tenderness and frangibility of the fruit ***,more efforts should be concentrated on the innovative shake-and-catch system with suitable frequency and amplitude to achieve low fruit damage or even nondestructive harvesting for fresh fruit *** overview summarized the advantages and bottlenecks of these shaking systems for fruit harvesting and proposed the challenges and some constructive prospective viewpoints aimed at the major issues of mechanical harvesting *** addition,employing sorting technologies to classify the postharvest fruits provide a new direction for the further development of mechanized harvesting in high-value fruit crops,as well as bring more benefits to growers and increase their interest in equipment investment on the mechanical shaking harvester for the fruit industry.

关键词： fruit crop mechanized harvesting shaking system fruit injury postharvest classification

来源：评论

学校读者我要写书评

暂无评论

dissect Black Box: Interpreting for rule-Based Explanations in Unsupervised Anomaly detection 38

Dissect Black Box: Interpreting for Rule-Based Explanations ...

引用

38th Conference on Neural Information Processing Systems, NeurIPS 2024

作者： Zhang, Yu Li, ruoyu Wu, Nengwu Li, Qing Lin, Xinhan Hu, Yang Li, Tao Jiang, Yong Shanghai Artificial Intelligence Laboratory China Peng Cheng Laboratory China College of Computer Science and Software Engineering Shenzhen University China Tsinghua University China Tsinghua Shenzhen International Graduate School China Hunan University of Science and Technology China

In high-stakes sectors such as network security, IoT security, accurately distinguishing between normal and anomalous data is critical due to the significant implications for operational success and safety in decision-making. The complexity is exacerbated by the presence of unlabeled data and the opaque nature of black-box anomaly detection models, which obscure the rationale behind their predictions. In this paper, we present a novel method to interpret the decision-making processes of these models, which are essential for detecting malicious activities without labeled attack data. We put forward the Segmentation Clustering decision Tree (SCd-Tree), designed to dissect and understand the structure of normal data distributions. The SCd-Tree integrates predictions from the anomaly detection model into its splitting criteria, enhancing the clustering process with the model's insights into anomalies. To further refine these segments, the Gaussian Boundary delineation (GBd) algorithm is employed to define boundaries within each segmented distribution, effectively delineating normal from anomalous data points. At this point, this approach addresses the curse of dimensionality by segmenting high-dimensional data and ensures resilience to data variability and perturbations through flexible boundary fitting. We transform the intricate operations of anomaly detection into an interpretable rule's format, constructing a comprehensive set of rules for understanding. Our method's evaluation on diverse datasets and models demonstrates superior explanation accuracy, fidelity, and robustness over existing method, proving its efficacy in environments where interpretability is paramount. © 2024 Neural information processing systems foundation. All rights reserved.

关键词：

来源：评论

学校读者我要写书评

暂无评论

A 64-Gb/s 0.33-pJ/bit PAM4 receiver Analog Front-End with a Single-Stage Triple-Peaking CTLE Achieving 22.5-dB Boost in 40-nm CMOS Process

A 64-Gb/s 0.33-pJ/bit PAM4 Receiver Analog Front-End with a ...

引用

2023 IEEE International Conference on Integrated Circuits, technologies and Applications, ICTA 2023

作者： Wang, Guoqing Zhang, Zhao Shen, Xinyu Zhang, Zhaoyu Liu, Jian Wu, Nanjian Liu, Liyuan University of Science and Technology of China China Institute of Semiconductors Chinese-Academy of Sciences China University of Chinese Academy of Sciences China

ISBN: (纸本)9798350344288

This paper presents a PAM4 receiver analog-front end (AFE) circuit. Our proposed single-stage triple-peaking continuous-time linear equalizer (CTLE) stage with current reuse technique is adopted to achieve low, middle and high frequency peaking concurrently. Thus, only one-stage CTLE is sufficient to achieve an over-20-dB boost at Nyquist frequency to save power. A variable-gain amplifier (VGA) is used to reduce the dC-gain variation at different CTLE equalization settings. Fabricated in a 40-nm CMOS process, our prototype AFE achieves 64-Gb/s data rate, 22.5-dB maximum peaking boost at 16-GHz, and an energy efficiency of 0.33 pJ/bit at 64-Gb/s data rate. It also features low, middle and high frequency peaking so that it can compensate a 12-dB channel loss at Nyquist frequency of 16-GHz. © 2023 IEEE.

关键词： Variable gain amplifiers

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：