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NURBS Modeling and Curve Interpolation Optimization of 3D Graphics

Computers, Materials & Continua 2021年第2期66卷 1799-1811页

作者： Hao Zhu Mulan Wang Kun Liu Weiye Xu School of Information and Communication Engineering Nanjing Institute of TechnologyNanjing211167China Jiangsu Key Laboratory of Advanced Numerical Control Technology Nanjing Institute of TechnologyNanjing211167China Department of informatics University of LeicesterLeicesterLE17RHUK

In order to solve the problem of complicated Non-Uniform Rational B-Splines(NURBS)modeling and improve the real-time performance of the high-order derivative of the curve interpolation process,the method of NURBS modeling based on the slicing and layering of triangular mesh is *** research and design of NURBS curve interpolation are carried out from the two aspects of software algorithm and hardware *** on the analysis of the characteristics of traditional computing methods with Taylor series expansion,the Adams formula and the Runge-Kutta formula are used in the NURBS curve interpolation process,and the process is then optimized according to the characteristics of NURBS *** can ensure accuracy,and avoid the calculation of higher-order ***,the hardware modules for the Adams and Runge-Kutta formulas are designed by using the parallel hardware construction technology of Field Programmable Gate Array(FPGA)*** parallel computing process using FPGA is compared with the traditional serial computing process using *** and experimental results show that this scheme can improve the computational speed of the system and that the algorithm is feasible.

关键词： NURBS modeling interpolation Adams Runge-Kutta FPGA

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A Spatial Feature Extraction Method for Enhancing Upper Limb Motion Intent Prediction in EMG-PR System

A Spatial Feature Extraction Method for Enhancing Upper Limb...

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Boxing Peng Haoshi Zhang Xiangxin Li Yue Zheng Guanglin Li CAS Key Laboratory of Human-Machine Intelligence-Synergy Systems Shenzhen Institutes of Advanced Technology (SIAT) Chinese Academy of Sciences (CAS) Shenzhen China Shenzhen College of Advanced Technology University of Chinese Academy of Sciences Shenzhen China Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and Technology Shenzhen China SIAT Branch Shenzhen Institute of Artificial Intelligence and Robotics for Society Shenzhen China

ISBN: (数字)9798350371499

ISBN: (纸本)9798350371505

High-Density Surface Electromyography (HD-sEMG) enriches motion intention pattern recognition systems by providing more spatial information. Multichannel linear descriptors (MLD) could provide a comprehensive description of the overall state characteristics within the muscle regions. In this study, an MLD-based spatial feature extraction method was proposed to capture differences and correlations in various muscle regions during movement, ultimately enhancing the system’s classification accuracy. The performance of the feature extraction method was compared with traditional time domain feature extraction method under various classifiers and different movement types. The results show that employing the proposed method with the spatial features improves the classification error rates of combined movements from 11.14% to 7.28%, and better adaptability for all classifiers utilized in this study, which shows the effect of utilization of spatial information in different muscle regions.

关键词： Correlation Accuracy Error analysis Muscles Feature extraction Electromyography Data mining Time-domain analysis Engineering in medicine and biology

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Simulation analysis of axial force on optical fibers in unmanned aerial vehicles based on genetic algorithm 4

Simulation analysis of axial force on optical fibers in unma...

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4th International Conference on Telecommunications, Optics, and Computer Science, TOCS 2023

作者： Zhang, Zhen Xi, Tingyu Zhang, Qiang School of Electronics and Information Zhengzhou University of Aeronautics Henan Zhengzhou450046 China Collaborative Innovation Center of Aeronautics and Astronautics Electronic Information Technology of Henan Province Zhengzhou University of Aeronautics Henan Zhengzhou450046 China Henan Key Laboratory of General Aviation Technology Zhengzhou University of Aeronautics Henan Zhengzhou450046 China School of Advanced Technology Xi’an Jiaotong-Liverpool University Jiangsu Suzhou215123 China

ISBN: (数字)9781510679849

ISBN: (纸本)9781510679832

Fiber optic sensors due to their advantages such as light weight, small size, high temperature resistance, corrosion resistance, and electromagnetic interference resistance, can largely overcome the influence of environmental factors, accurately monitor various parameters of aircraft, and timely judge and prevent accidents. Therefore, they are suitable for parameter monitoring of unmanned aerial vehicles. In the working state of unmanned aerial vehicles, optical fibers are easily affected by axial forces, which in turn affects the accuracy and stability of fiber optic sensors in monitoring aircraft parameters. This study applies genetic algorithm to establish a mathematical model for the axial force on optical fibers. The algorithm is implemented through steps such as determining decision variables and constraints, establishing an optimization model, encoding, decoding, selection, crossover, mutation, and population iteration. Finally, by changing different parameter values for simulation analysis, the optimal approximate solution of the center wavelength value when the fiber optic is subjected to axial force was obtained. This effectively adjusts the fiber optic sensing system, improves the real-time, accuracy, and stability of unmanned aerial vehicle parameter monitoring, and has good application value and promotion significance. © 2024 SPIE.

关键词： Genetic algorithms

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Ionically Imprinting-Based Copper(Ⅱ)Label-Free Detection for Preventing Hearing Loss

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Engineering 2024年第2期33卷 276-282页

作者： Huan Wang Hui Zhang Xiaoli Zhang Hong Chen Ling Lu Renjie Chai The Eighth Affiliated Hospital Sun Yat-Sen UniversityShenzhen 518033China State Key Laboratory of Digital Medical Engineering Department of Otolaryngology Head and Neck SurgeryZhongda Hospital&Advanced Institute for Life and HealthSoutheast UniversityNanjing 210096China Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging Department of Biomedical EngineeringShenzhen UniversityShenzhen 518060China Department of Otolaryngology Head and Neck Surgery Jiangsu Provincial Key Medical DisciplineNanjing Drum Tower HospitalThe Affiliated Hospital of Nanjing University Medical SchoolNanjing 210008China Co-Innovation Center of Neuroregeneration Nantong UniversityNantong 226001China Department of Otolaryngology Head and Neck Surgery Sichuan Provincial People's HospitalUniversity of Electronic Science and Technology of ChinaChengdu 610072China Institute for Stem Cell and Regeneration Chinese Academy of ScienceBeijing 100101China Beijing Key Laboratory of Neural Regeneration and Repair Capital Medical UniversityBeijing 100069China

Copper is a microelement with important physiological functions in the ***,the excess copper ion(Cu^(2+))may cause severe health problems,such as hair cell apoptosis and the resultant hearing ***,the assay of Cu^(2+)is *** integrate ionic imprinting technology(IIT)and structurally colored hydrogel beads to prepare chitosan-based ionically imprinted hydrogel beads(IIHBs)as a low-cost and high-specificity platform for Cu^(2+)*** IIHBs have a macroporous microstructure,uniform size,vivid structural color,and magnetic *** incubated in solution,IIHBs recognize Cu^(2+)and exhibit a reflective peak change,thereby achieving label-free *** addition,benefiting from the IIT,the IIHBs display good specificity and selectivity and have an imprinting factor of 19.14 at 100μmol·L^(-1).These features indicated that the developed IIHBs are promising candidates for Cu^(2+)detection,particularly for the prevention of hearing loss.

关键词： Structural color Microfluidics Ionic imprinting Label-free detection Hearing loss

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Modulating Strengthening Ability of Layer-Grained Fcc Metals with Distinct Stacking Fault Energy, Molecular Dynamics Simulation

SSRN

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SSRN 2023年

作者： Jing, Peng Wang, Yu Zhou, Yuankai School of Mechanical Engineering Jiangsu University of Science and Technology Zhenjiang212003 China Jiangsu Provincial Key Laboratory of Advanced Manufacturing for Marine Mechanical Equipment Jiangsu University of Science and Technology Zhenjiang212003 China

The limited ductility of nanocrystalline metals severely hinders their practical applications due to the absence of strain hardening. In this study, we observe strain hardening in layer-grained models through molecular dynamics simulations. Our quantitative analysis demonstrates that grain boundary deformation induces strain hardening, while dislocation activities lead to strain softening in the simulation model. This finding is fundamentally different from previous assumptions that dislocation activities cause strain hardening, and grain boundary deformation leads to strain softening. The competition between grain boundary deformation and dislocation activities determines the strain hardening behaviors in nanocrystalline metals. By modifying the stacking fault energy and tailoring lamellar grains, it is possible to increase the proportion of grain boundary deformation and achieve ductility in strong nanocrystalline metals. Such materials, which exhibit high strength and good ductility, hold great potential for a wide range of industrial and engineering applications. © 2023, The Authors. All rights reserved.

关键词： Molecular dynamics

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Significant photothermoelectric effect of topological semimetals at infrared bands

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Physical Review Applied 2025年第3期23卷 034077-034077页

作者： Cheng-Hao Yin Hong-Tao Jiang Yang-Yang Lv Shu-Hua Yao Jian Zhou Y. B. Chen Yan-Feng Chen National Laboratory of Solid State Microstructures Nanjing University Nanjing 210093 China Department of Physics Nanjing University Nanjing 210093 China Jiangsu Key Laboratory of Artificial Functional Materials & Department of Materials Science and Engineering Nanjing University Nanjing 210093 China Hubei Key Laboratory of Plasma Chemistry and Advanced Materials Wuhan Institute of Technology Wuhan 430205 China Collaborative Innovation Center of Advanced Microstructures Nanjing University Nanjing 210093 China

We theoretically explore the photothermoelectric effect (PTE) of topological semimetals using the static two-temperature model. The interaction between the Dirac or Weyl fermions and electromagnetic waves is described by the dielectric constant in the model Hamilton of topological semimetals. Numerical calculations predict a significant PTE in the conventional plasmon mode with infrared bands of both the Dirac and Weyl semimetals. In addition to the PTE with a plasmon mode, the Weyl semimetals exhibit an enormous PTE at the frequencies of the two unconventional modes (helicon waves) in the infrared region. The helicon-wave modes originate from the resonant coupling between left- and right-circularly polarized electromagnetic waves and the helical motion of Weyl electron under an effective magnetic field induced by the Berry curvature. The frequencies of the helicon-wave modes depend on the carrier concentration, the Fermi velocity, and the distance between the positive and negative Weyl points in the Weyl semimetals, as well as the transport lifetime of the Weyl fermion. Using real parameters for the topological semimetals, we propose ideal materials for detecting the specific infrared bands of electromagnetic waves. This work strongly suggests that topological semimetals are promising for detecting electromagnetic waves in the infrared region, taking advantage of their significant PTE.

关键词： Helicons

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High-Throughput Production of Low-Cost Superhydrophobic and Oleophilic Mullite Fiber Sponges for High-Temperature Pm Filtration

SSRN

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SSRN 2024年

作者： Hu, Yuwen Zhu, Ruijian Zheng, Dazhi Liang, Shiou Wang, Zengmei School of Materials Science and Engineering Jiangsu Key lab. of Construction Materials Southeast University Nanjing211189 China School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing Institute of Technology Nanjing211167 China

Particulate matter (PM) from high-temperature emissions like chemical plants, coal stoves and vehicle exhausts poses a gravel challenge to human health. To address this issue, researchers have explored various fiber filters, yet the bulk struggle to withstand high temperatures. In this study, mullite fiber sponges were developed utilizing low-cost materials and Kármán vortex solution blow spinning. Optimized sponges demonstrate ultralight (18 mg cm−3), temperature-resistant reversible compressibility (50% strain) and a water contact angle of 135°. These sponges exhibited exceptional thermal insulation (thermal conductivity: 0.0269 W m−1 K−1) and performed well in high-temperature air filtration. At 800 °C, the mullite sponge with a base weight of 35 mg cm−2, achieved an average filtration efficiency of 98.18% and 99.57% for PM2.5 and PM2.5−10, respectively, with a quality value of 0.98 Pa-1 at a wind speed of 4 cm s−1. This low-cost mullite fiber sponge offers a promising avenue for designing high-performance filtration materials. © 2024, The Authors. All rights reserved.

关键词： Costs

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advanced flexible humidity sensors:structures,techniques,mechanisms and performances

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Frontiers of Materials Science 2023年第4期17卷 37-53页

作者： Yuzhe Zhang Yuxi Liu Lifei Lin Man Zhou Wang Zhang Liwei Lin Zhongyu Li Yuanzhe Piao Sun Ha Paek School of Environmental Science and Engineering Changzhou UniversityChangzhou 213164China Department of Applied Bioengineering Graduate School of Convergence Science and TechnologySeoul National UniversitySeoul 08826Republic of Korea Jiangsu Key Laboratory of Advanced Catalytic Materials and Technology School of Petrochemical EngineeringChangzhou UniversityChangzhou 213164China College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China Department of Neurosurgery Movement Disorder CenterSeoul National University HospitalSeoul 03080Republic of Korea Advanced Institutes of Convergence Technology Suwon-siGyeonggi-do 16229Republic of Korea

Flexible humidity sensors are widely used in many fields,such as environmental monitoring,agricultural soil moisture content determination,food quality monitoring and healthcare ***,it is essential to measure humidity accurately and reliably in different *** materials have been the focusing substrates of humidity sensors because of their rich surface chemical properties and structural *** addition,flexible materials have superior ductility for different *** this review,we have summarized several sensing mechanisms,processing techniques,sensing layers and substrates for specific humidity sensing ***,we have sorted out some cases of flexible humidity sensors based on different functional *** hope this paper can contribute to the development of flexible humidity sensors in the future.

关键词： flexible composite manufacturing technology sensing mechanism humidity sensor

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Construction of 2d/2d Bi4o5br2/Bi2wo6 Z-Scheme Heterojunction for Highly Efficient Photodegradation of Ciprofloxacin Under Visible Light

SSRN

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SSRN 2023年

作者： Qian, Xingyue Ma, Yu Arif, Muhammad Xia, Jiawei He, Guangyu Chen, Haiqun Key Laboratory of Advanced Catalytic Materials and Technology Advanced Catalysis and Green Manufacturing Collaborative Innovation Center Changzhou University Jiangsu Province Changzhou213164 China

Enhancing the heterointerface contact determined by the dimensionality of each component is essential for the rapid migration of photogenerated charge carriers. Herein, the 2D/2D Bi4O5Br2/Bi2WO6 Z-scheme heterojunction was successfully synthesized through a simple chemical co-precipitation followed by a hydrothermal process. Remarkably, the optimized Bi4O5Br2/Bi2WO6 heterojunction achieved superior photocatalytic efficiency of 91.0% and ascendant stability for the degradation of ciprofloxacin (CIP) under visible light illumination. More importantly, degradation pathway and photocatalytic mechanism analysis revealed that the reinforced photodegradation efficiency can be ascribed to the intimate heterointerface between 2D Bi4O5Br2 and 2D Bi2WO6, which facilitated the fast migration and separation of photoinduced carriers, thus enhancing the photocatalytic activity. Furthermore, the effect of pH, CIP concentration, inorganic cations and anions, and different contaminants were systematically investigated to explore the potential of practical applications. This work gives rational insight into the developing 2D/2D Z-scheme heterojunction for environmental remediation. © 2023, The Authors. All rights reserved.

关键词： Bismuth compounds

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Controllably Growing Topologies in One-shot RAFT Polymerization via Macro-latent Monomer Strategy

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Chinese Journal of Polymer Science 2021年第1期39卷 60-69,I0006页

作者： Liu-Qiao Zhang Yang Gao Zhi-Hao Huang Wei Zhang Nian-Chen Zhou Zheng-Biao Zhang Xiu-Lin Zhu State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials Jiangsu Key Laboratory of Advanced Functional Polymer Design and ApplicationCollege of ChemistryChemical Engineering and Materials ScienceSoochow UniversitySuzhou 215123China Global Institute of Software Technology Suzhou 215163China

The controlled and efficient synthesis of polymers with tailored topologies is challenging but important for exploring structure/property research. Herein, we proposed a concept of macro-latent monomer to achieve the controlled growth of polymer *** macro-latent monomer was installed by a dynamic furan/maleimide covalent bond at the chain terminal. One-shot reversible additionfragmentation chain transfer(RAFT) polymerization of styrene and the macro-latent monomer created controlled growth of polymer *** temperature such as 40 ℃ could not activate the macro-latent monomer and thus the polymerization created the homo-polystyrene. By contrast, high temperature of ~110 ℃ activated the macro-latent monomer, and a maleimide-terminated macro-monomer was released via the retro-Diels Alder reaction. This macro-monomer immediately joined the cross polymerization with styrene and thus produced the side chains. By delicately manipulating the polymerization temperature, the predetermined placement of the macro-latent monomer-derived polymeric sidechains created controllably growing topologies, including star-, π-shaped, and density-variable grafting copolymers. This work paved a new way for creating on-demand topologies and would greatly enrich the topology synthesis.

关键词： Latent monomer Diels-Alder reaction Maleimide Styrene Topologies

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