检索结果-内蒙古大学图书馆

SSRN 2023年

作者： Sun, Mingxiao Zhen, Liqiang Luan, Tiantian Zhang, Xiaoshuang Wu, Baoqi School of Automation Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Heilongjiang Provincial Key Laboratory of Complex Intelligent System and Integration Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Jiangsu Automation Research Institution No. 18 Shenghu Road Haizhou District Jiangsu Province Lianyungang City222000 China

The artificial potential field approach (APFA) has the advantages of short computation time and easy implementation, which is widely used in path planning. The problems of local oscillation and susceptibility to local minima for APFA are considered in three dimensions (3D) path planning application of unmanned underwater vehicle (UUV), and the artificial potential field grid method (APFG) is proposed. Firstly, the obstacles are rasterized in 3D map. The repulsive points are attached to the surface of the raster to change the repulsive influence range, which can compensate the shortcoming of the traditional APFA modelling idealization leading to the long planning path. At the same time, the repulsion function on the grid surface is changed so that the potential field on the grid surface is parallel to the grid surface, which will solve the local oscillation problem in the path planning of UUV. Then, virtual target points are introduced to avoid the UUV falling into local optimization. The simulations show that APFG effectively overcomes the shortcomings of local oscillations and the tendency to fall into local minima for UUV in 3D path planning, and the path planning is smooth and efficient. © 2023, The Authors. All rights reserved.

关键词： Unmanned underwater vehicles

来源：评论

学校读者我要写书评

暂无评论

3d Path Planning for Uuv Based on Artificial Potential Field Grid Method

SSRN

引用

SSRN 2023年

关键词： Motion planning

来源：评论

学校读者我要写书评

暂无评论

Loss induced negative refraction and super-prism effect at highly absorptive interface

引用

Chinese Physics B 2019年第5期28卷 101-105页

作者： Jian Wu Tao Wang Tianyue Hou Xuefen Kan Cheng Yin Pu Zhou Zhuangqi Cao College of Advanced Interdisciplinary Studies National University of Defense Technology Hunan Provincial Key Laboratory of High Energy Laser Technology Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai University College of Physics and Astronomy Shanghai Jiao Tong University

It is well-established that waves are inhomogeneous in a lossy isotropic medium, and the validation of the classical Snell's law is still questionable for light refraction at the dissipative and dispersive interface. With high absorption, direct experimental investigation is rather difficult due to the extremely short penetration depth; i.e., the skin depth. In this paper, a simple and unified description of this issue is proposed, which can be applied to both materials with anomalous dispersion and in the Drude region. The gradient ▽_k~ω is found to be incident angle θ_i-dependent, and the direction of the group velocity may deviate significantly from the phase velocity due to the loss induced permittivity structure. The physics behind the negative refraction effect is explained, and a novel loss induced super-prism effect is also predicted.

关键词： Snell’s Law Drude model anomalous dispersion lossy isotropic media

来源：评论

学校读者我要写书评

暂无评论

Lift Analysis and Anti-Rolling Control System Design of Magnus Rotating Roll Stabilizer with Full Speed

SSRN

引用

SSRN 2023年

作者： Sun, Mingxiao Lian, Houxin Luan, Tiantian Zhang, Xiaoshuang Wu, Baoqi Wang, Hanxu School of Automation Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Heilongjiang Provincial Key Laboratory of Complex Intelligent System and Integration Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Key Laboratory of Advanced Manufacturing and Intelligent Technology Ministry of Education Harbin University of Science and Technology No.52 Xuefu Road Nangang District Heilongjiang Province Harbin City150080 China Jiangsu Automation Research Institute No. 18 Shenghu Road Haizhou District Jiangsu Province Lianyungang City222000 China

To shorten the deviation between the roll motion model of ships equipped with Magnus rotating roll stabilizer and actual motion, a full-speed lift calculation method is proposed. By combining the micro-element method with the mechanism of the Magnus effect force, the lift law of the rotating stabilizer in different modes could be obtained theoretically. Subsequently, correction factors are fitted for different operating conditions to correct the full-speed lift model through hydrodynamic simulation analysis of the stabilizer. In addition, RBF neural networks are also introduced to address the uncertainty and nonlinearity of ship models under high winds and waves. This network is used to predict nonlinear ship models with uncertainty to optimize the anti-rolling effect of the sliding mode controller. As a result, the corrected lift model can accurately predict the real-time lift changes of the Magnus rotating stabilizer in both rotating and swing-rotating modes. The maximum deviation rate doesn’t exceed 8.5% compared to the simulation. The adaptability of the anti-rolling control system is improved. And the sliding mode control algorithm based on RBF neural network has the outstanding anti-rolling ability under various conditions, with a maximum anti-rolling efficiency of over 98%. © 2023, The Authors. All rights reserved.

关键词： Sliding mode control

来源：评论

学校读者我要写书评

暂无评论

A novel electron beam additive manufacturing method: diffusion-based pre-melted electron beam freeform fabrication

引用

Materials Letters 2025年 398卷

作者： Xi Shu Guoqing Chen Chunyu Wang Chunju Wang Lining Sun School of Mechanical and Electric Engineering Jiangsu Provincial Key Laboratory of Advanced Robotics Soochow University Suzhou 215123 China State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001 China School of Mechanical and Electric Engineering Hefei Technology College Hefei 238007 China

Additive manufacturing still faces several significant challenges, including coarse grain structure, uneven element distribution, and difficulties in process control. This study introduces the pre-melted electron beam freeform fabrication method as a targeted solution to these issues. A tungsten diversion nozzle is employed to mitigate excessive thermal input and intense melt pool stirring. This nozzle reduces direct electron beam impact on the base metal, promoting grain refinement within the fabricated part and enhancing its mechanical properties. The molten metal merely wets and spreads on the surface of the base metal, avoiding deeper base metal melting. When the 10-layer deposit achieves optimal interlayer fusion, it exhibits a tensile strength of up to 1083 MPa, comparable to that of forged TC4 titanium alloy.

关键词： Additive manufacturing Electron beam freeform fabrication Microstructure Tensile strength

来源：评论

学校读者我要写书评

暂无评论

Direct observation of geometric and sliding ferroelectricity in an amphidynamic crystal

arXiv

引用

arXiv 2023年

作者： Miao, Le-Ping Ding, Ning Wang, Na Shi, Chao Ye, Heng-Yun Li, Linglong Yao, Ye-Feng Dong, Shuai Zhang, Yi Institute for Science and Applications of Molecular Ferroelectrics Key Laboratory of the Ministry of Education for Advanced Catalysis Materials Zhejiang Normal University Jinhua321004 China Chaotic Matter Science Research Center Department of Materials Metallurgy and Chemistry Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry Jiangxi University of Science and Technology Ganzhou341000 China Jiangsu Key Laboratory for Science and Applications of Molecular Ferroelectrics Southeast University Nanjing211189 China School of Physics Southeast University Nanjing211189 China Shanghai Key Laboratory of Magnetic Resonance School of Physics and Materials Science East China Normal University Shanghai200062 China

Sliding ferroelectricity was recently theoretically proposed and then experimentally confirmed as a new kind of polarity existing in two-dimensional materials. However, due to their weak polarization and poor electrical insulation, all available experimental evidences till now are indirect, most of which are based on the transport properties in nanoscale or piezoresponse force microscopy. Here, we report the direct observation of sliding ferroelectricity in an amphidynamic crystal (15-Crown-5)Cd3Cl6. This coordination polymer is a van der Waals material, which is constructed by inorganic stators and organic rotators. After the freezing of rotators, an electric dipole is generated in each layer driven by the geometric mechanism, meanwhile a comparable ferroelectric polarization originates from the interlayer sliding. The net polarization of these two components can be directly measured and manipulated. Our finding provides new insight into low-dimensional ferroelectrics, especially the controlling of synchronous dynamics of rotating molecules and sliding layers in solids. Copyright © 2023, The Authors. All rights reserved.

关键词： Ferroelectricity

来源：评论

学校读者我要写书评

暂无评论

S vacancies in 2D SnS_(2) accelerating hydrogen evolution reaction

引用

Science China Materials 2022年第7期65卷 1833-1841页

作者： Gonglei Shao Haiyan Xiang Mengjie Huang Yi Zong Jun Luo Yexin Feng Xiong-Xiong Xue Jie Xu Song Liu Zhen Zhou Engineering Research Center of Advanced Functional Material Manufacturing of Ministry of Education School of Chemical EngineeringZhengzhou UniversityZhengzhou 450001China Institute of Chemical Biology and Nanomedicine(ICBN) State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China Institute of Functional Nano and Soft Materials(FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials&DevicesSoochow UniversitySuzhou 215123China School of Materials Science and Engineering Tianjin University of TechnologyTianjin 300384China Hunan Provincial Key Laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Precise manipulation of atomic defects is essential for modulating the intrinsic properties of two-dimensional(2D)*** this study,sulfur(S)atoms are accurately knocked out in the 2D basal plane of pure tin disulfide(SnS_(2)).By varying the annealing temperatures(250–350℃),SnS_(2)with different S vacancy concentrations(Vs-SnS_(2))can be *** SnS_(2)is annealed at 350℃ for 5 h,the S vacancies in the forms of single S atom and double S atoms could reach up to 30.5%.The Vs-SnS_(2)is tested in the microelectrocatalytic hydrogen evolution reaction(HER).Vs-SnS_(2)with S vacancies of 30.5%generates superior catalytic performance,with a Tafel slope of 74 mV dec^(-1) and onset potential of 141 *** mechanism has been ***,computation confirms that the absence of S atoms prompts surface charge modulation and enhances electronic *** addition,the under-coordinated Sn atoms adjacent to S vacancy introduce the lattice distortion and charge density redistribution,which are beneficial to hydrogen binding in *** short,accurate knockout of specific atoms by controlling the annealing temperature is a promising strategy to explore structure-dependent properties of various 2D materials.

关键词： SnS_(2) annealing S vacancy HAADF-STEM hydrogen evolution reaction

来源：评论

学校读者我要写书评

暂无评论

Improved Cycling Stability of Single-Crystalline Ni-Rich Cathode at High Temperature Via Dual Substitution

SSRN

引用

SSRN 2023年

作者： Shen, Jixue Li, Hui Qi, Haoyu Li, Zeheng Lin, Zhan Zheng, Chuanbo Du, Weitong Chen, Hao Zhang, Shanqing School of Metallurgy Engineering Jiangsu University of Science and Technology Zhangjiagang215600 China School of Metallurgy and Environment Central South University Changsha410083 China Guangzhou Key Laboratory of Clean Transportation Energy Chemistry School of Chemical Engineering and Light Industry Guangdong University of Technology Guangzhou510006 China Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology College of Chemical and Biological Engineering Zhejiang University Hangzhou310027 China Centre for Catalysis and Clean Energy School of Environment and Science Gold Coast Campus Griffith University QLD4222 Australia

Despite high specific capacity, Ni-rich cathode materials still face poor cycling stability resulting from structural degradation during cycles, especially at high temperatures. Herein, single-crystalline LiNi0.83Co0.12Mn0.05O2 (NCM) is synthesized using a dual-substitution strategy, where sodium (Na) and tungsten (W) elements are co-doped to effectively inhibit Li+/Ni2+ mixing, delay H2-H3 phase transition, limit the generation of microcracks and enhance the high-temperature performance of single-crystalline Na/W-doped NCM (NWNCM). Notably, when cycled between 2.95 and 4.3 V (vs. Li/Li+) at a high temperature of 55 ºC, the NWNCM exhibits improved capacity retention of 81% at 55 ºC at 1 C, outstanding rate capacity of 182.8 mAh g-1 at 4 C (about of 92.3% the capacity at 1 C) and enhanced thermal stability. More impressively, the pouch-type full cell paired with the as-prepared NWNCM also delivers a high capacity retention of 87% after 1000 charge/discharge cycles at 1 C in the voltage range of 2.8 to 4.25 V at 55 ºC. The synergetic effects of this dual-substitution strategy pave a new pathway for addressing the critical challenges of Ni-rich cathode at high temperatures, which will significantly advance the high-energy-density cathodes to the subsequent commercialization. © 2023, The Authors. All rights reserved.

关键词： Lithium-ion batteries

来源：评论

学校读者我要写书评

暂无评论

Conjugated Microporous Polymer Derived Hierarchically Porous N-Rich Nanocarbon as a Durable Electrocatalyst for Oxygen Reduction Reaction in Zn-Air Battery

SSRN

引用

SSRN 2024年

作者： Liu, Lunjie Xu, Zian Xia, Yu Gao, Mei-Yan Jin, Qin Zheng, Baobing Liu, Chongxuan Chen, Shaoqing Zhang, Zhe Wang, Hsing-Lin Department of Materials Science and Engineering College of Engineering Southern University of Science and Technology Shenzhen518055 China Guangdong Provincial Key Laboratory of Energy Materials for Electric Power Southern University of Science and Technology Shenzhen518055 China School of Physics and Astronomy University of Birmingham BirminghamB15 2TT United Kingdom Department of Chemical Sciences Bernal Institute University of Limerick LimerickV94 T9PX Ireland College of Physics Science and Technology Yangzhou University Yangzhou225009 China College of Physics and Optoelectronic Technology Baoji University of Arts and Sciences Baoji721016 China School of Environmental Science and Engineering Southern University of Science and Technology Shenzhen518055 China College of Energy Soochow Institute for Energy and Materials Innovations Jiangsu Provincial Key Laboratory for Advanced Carbon Materials and Wearable Energy Technologies Soochow University Suzhou215006 China

Nitrogen (N)-doped carbon materials with porous structures are widespread in electrocatalysis for clean energy and environmental remediation applications. However, the synergistic design of hierarchical porous structures and active sites remains challenging. Here, we present a facile and general strategy of using conjugated microporous polymers (CMPs) as the precursors to create in-situ N-doped nanocarbon electrocatalysts through high-temperature pyrolysis. The obtained hierarchically porous carbon sample of TEPT-TA-800 can retain the nanoparticle morphology and high porosity after carbonization and demonstrates exceptional oxygen reduction reaction (ORR) performance with a positive onset potential of 0.94 V vs. RHE and half-wave potential of 0.85 V vs. RHE in an alkaline electrolyte. Theoretical calculations reveal that with the presence of triazine rings, the binding affinity of the ORR intermediates (*OOH, *O, and *OH) and the stability of adsorbed oxygen on TEPT-TA-800 can be improved, which positively impacts the ORR process. Furthermore, TEPT-TA-800 serves as the cathode to construct a Zn-air battery (ZAB), which exhibits superior peak power density (143.1 mW cm-2), higher specific capacity (792 mAh g-1), and longer-lasting stability (650 h) compared with Pt/C-based ZAB. These findings provide valuable insights into rationally designing CMP-derived carbon materials for various catalysis reactions and energy conversion applications. © 2024, The Authors. All rights reserved.

关键词： Electrocatalysts

来源：评论

学校读者我要写书评

暂无评论

Rational Design of a Negative Photochromic Spiropyran-Contained Fluorescent Polymeric Nanoprobe for Sulfur Dioxide Ratiometric Detection and in Vivo Imaging

SSRN

引用

SSRN 2022年

作者： Chen, Jian Li, Xiang Lin, Zhong Tian, Yong Zhang, Chonghua Zhang, Peisheng Zeng, Rongjin Qiao, Lei Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers Hunan Provincial Key Lab of Advanced Materials for New Energy Storage and Conversion Hunan Province College Key Laboratory of QSAR/QSPR School of Chemistry and Chemical Engineering Hunan University of Science and Technology Hunan Xiangtan411201 China Central Laboratory of the Affiliated Xuzhou Municipal Hospital of Xuzhou Medical University Xuzhou first People's Hospital Jiangsu Xuzhou221116 China Key Laboratory of Optic-Electric Sensing and Analytical Chemistry for Life Science MOE Shandong Key Laboratory of Biochemical Analysis College of Chemistry and Molecular Engineering Qingdao University of Science and Technology China

It is highly desirable to develop high-performance of ratiometric fluorescent probes for SO2 detection and realize their application in biological imaging and food detection. In this study, we reported the rational design of a novel negative photochromic spiropyran derivative as Spiro[azahomoadamantane-pyran] (MAHD-SP) with notable orange fluorescence in its stable ring-opened state without UV regulation. The unsaturated double bond of MAHD-SP can undergo Michael addition reaction of SO2 , which makes the obviously fluorescence quenching of MAHD-SP. Then, MAHD-SP, a fluorescent conjugated polymer PFO and a polymeric surfactant PEO113 - b -PS49 were used to construct a ratiometric fluorescent polymeric nanoprobe ( RFPN ) via co-precipitation method. The probe exhibited high sensitivity and selectivity toward ratiometric detection of SO2 in pure aqueous solutions. Moreover, RFPN was applied to quantitative analysis of SO2 in food and water samples. The good biocompatibility of RFPN can also be used to visualization of exogenous and endogenous SO2 generation in zebrafish model. © 2022, The Authors. All rights reserved.

关键词： Addition reactions

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：