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2nd Spring International Conference on Defence technology, ICDT 2020

作者： Yin, H.Q. Yi, W.J. Li, C.C. Wang, K.J. Wu, J.T. National Key Laboratory of Transient Physics Nanjing University of Science and Technology Nanjing210094 China Beijing Institute of Astronautical System Engineering Beijing100076 China

Brushless direct current motor (BLDCM) is a complicated system with multivariable, nonlinear and strong coupled. The present work devotes to design a fuzzy adaptive PID algorithm based on the speed loop so that it could crack the traditional PID problems which include bad parameter setting, poor adaptability, imprecise control and weak anti-interference so on. In this paper, the mathematical model and operating characteristics of BLDCM are analyzed. Then, the simulation platform is built by MATLAB/Simulink. Finally, the control effects of PI, PID and fuzzy adaptive PID are compared and analyzed. The results indicate that the fuzzy adaptive PID is better robustness, faster response, smaller overshoot and more stable operation than others. © Published under licence by IOP Publishing Ltd.

关键词： Brushless DC motors

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Preliminary evaluation of fecral-UN fuel rod performance 14

Preliminary evaluation of fecral-UN fuel rod performance

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14th International Nuclear Fuel Cycle Conference, GLOBAL 2019 and Light Water reactor Fuel Performance Conference, TOP FUEL 2019

作者： Gao, Shixin Duan, Zhengang Zhou, Yi Chen, Ping He, Liang Liu, Shichao Zhang, Kun Qiu, Xi Zhang, Ruiqian Science and Technology on Reactor System Design Technology Laboratory No.328 Section 1 Changshun Road Shuangliu County Chengdu610213 China Nuclear Power Institute of China No.328 Section 1 Changshun Road Shuangliu County Chengdu610213 China

After the accident at the Fukushima Daiichi nuclear power plant, many institutions around the world developed the development of accident-tolerant fuel (ATF). Many institutions in China have been conducting research and development on accident tolerant fuels. NPIC plays the most important role in the CNNC Accident Tolerant Fuel (ATF) program, which aims to develop advanced fuels and claddings that have improved performance under normal conditions, design basis accidents (DBA) and beyond design basis accidents (BDBA). Due to its excellent corrosion resistance, FeCrAl stainless steel has become one of the most important ATF cladding concepts. The FeCrAl concept provides the operator with some extra coping time to deal with accident conditions compared to traditional zirconium-based cladding. Uranium mononitride has been identified as an alternative fuel with higher uranium density and thermal conductivity when compared to UO2. In NPIC ATF campaign, FeCrAl is one of the advanced cladding concepts and UN is one of the advanced fuel candidates. NPIC has developed about 4m full-length thin-walled FeCrAl tubes with several varied chemical composition as fuel rod cladding. NPIC also prepared UN fuel pellets by sintering. This paper focuses on in-pile performance analysis of UN fuel rod with FeCrAl cladding, so as to make suggestions for future FeCrAl-UN fuel rod research, preparation and application. This paper uses FUPAC code to make analysis on fuel rod in-pile performance. The simulation uses the most recently known material properties. Some analyses of FeCrAl-UN fuel rod performance at steady state conditions are performed. And the results show that FeCrAl-UN fuel rod has good performance in aspects such as fuel temperature, fission gas release, fuel rod internal pressure, etc. Finally, future research and development work are discussed. Copyright © GLOBAL 2019 - International Nuclear Fuel Cycle Conference and TOP FUEL 2019 - Light Water reactor Fuel Performance Confere

关键词： Ternary alloys

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Biomechanical Finite Element Methods Study of a Novel Internal Fixation system for Lumbar Spondylolysis

SSRN

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SSRN 2025年

作者： Li, Jingyuan Du, Chengfei Wang, Yulei Du, Di Liang, Jinlong Shao, Nengqi Feng, Fanzhe Xu, Wenhao Xu, Yongqing Cui, Yi Center for Joint Surgery Intelligent Manufacturing and Rehabilitation Engineering Center The First Affiliated Hospital of Army Medical University Chongqing400038 China Chongqing Municipal Science and Technology Bureau Key Laboratory of Precision Medicine in Joint Surgery Chongqing400038 China Chongqing Municipal Education Commission Key Laboratory of Joint Biology Chongqing400038 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of mechanical engineering Tianjin University of Technology Tianjin300384 China Department of Orthopaedic Surgery 920th Hospital of Joint Logistics Support Force Kunming650032 China Department of Orthopaedic Surgery 920th Hospital of Joint Logistics Support Force No. 212 of Da-Guan Road Xishan District Kunming650032 China

ObjectiveThis study aimed to verify the biomechanical efficacy of a novel internal fixation system for repairing lumbar spondylolysis (LS). Additionally, the changes in the mechanical performance of the novel internal fixation device during compression were *** healthy 25-year-old male volunteer was recruited for lumbar spine CT data acquisition to construct and validate a nonlinear finite element model of the L4-S1 spinal segment (A). Based on this, models were established for L5 spondylolysis (B), traditional internal fixation (C), and the pressurization process of the novel LS repair device fixation (D→E→F). For these six models, we constrained the lower surface of the S1 vertebral body while applying an axial compression force of 500 N and a moment load of 7.5 N·m on the upper surface of the L4 vertebral body to simulate six motions of the lumbar spine. The performance of each finite element model was evaluated by comparing the range of motion (ROM), maximum displacement, and maximum pressure experienced by the lumbar spine under different motion *** with Model C, Models D, E, and F exhibited a reduced ROM and maximum displacement (1%-38.5%, 12.8%-63.6%, and 32.8%-80.2%) compared with Model C during six different motions. Notably, compared with Model C, the novel internal fixation models consistently demonstrated a decreasing trend in the maximum stress on the intervertebral discs (IVD) and an increasing trend in the maximum stress on the articular cartilage and maximum stress and displacement of the bone graft. Moreover, the novel internal fixation model displayed larger ranges of evenly distributed stresses on the isthmus and reduced maximum stress on the internal fixation device across all six motions, with improved stiffness effects during the pressurization process of the novel internal fixation system (D→E→F).ConclusionsAccording to several mechanical comparisons, the novel internal fixation system had better biomechan

关键词： Axial compression

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Uncovering inequalities in new knowledge learning by large language models across different languages

arXiv

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arXiv 2025年

作者： Wang, Chenglong Tang, Haoyu Yang, Xiyuan Xie, Yueqi Suh, Jina Sitaram, Sunayana Huang, Junming Xie, Yu Gong, Zhaoya Xie, Xing Wu, Fangzhao School of Urban Planning and Design Peking University Shenzhen Graduate School Shenzhen China Key Laboratory of Earth Surface System and Human-Earth Relations Ministry of Natural Resources of China Peking University Shenzhen Graduate School Shenzhen China School of Computer Science and Technology University of Science and Technology of China Hefei China School of Computer Science Wuhan University Wuhan China Hong Kong University of Science and Technology Hong Kong Microsoft Research Redmond United States Microsoft Research Bengaluru India Paul and Marcia Center on Contemporary China Princeton University Princeton United States Center for Social Research Guanghua School of Management Peking University Beijing China Microsoft Research Asia Beijing China

As large language models (LLMs) gradually become integral tools for problem solving in daily life worldwide, understanding linguistic inequality is becoming increasingly important. Existing research has primarily focused on static analyses that assess the disparities in the existing knowledge and capabilities of LLMs across languages. However, LLMs are continuously evolving, acquiring new knowledge to generate up-to-date, domain-specific responses. Investigating linguistic inequalities within this dynamic process is, therefore, also essential. In this paper, we explore inequalities in new knowledge learning by LLMs across different languages and four key dimensions: effectiveness, transferability, prioritization, and robustness. Through extensive experiments under two settings (in-context learning and fine-tuning) using both proprietary and open-source models, we demonstrate that low-resource languages consistently face disadvantages across all four dimensions. By shedding light on these disparities, we aim to raise awareness of linguistic inequities in LLMs’ new knowledge learning, fostering the development of more inclusive and equitable future LLMs. Copyright © 2025, The Authors. All rights reserved.

关键词： Contrastive Learning

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Necklace-Like Te-Au Reticula Platform with Three Dimensional Hotspots for Surface-Enhanced Raman Scattering (Sers) Sensor for Food Hazards Analysis

SSRN

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SSRN 2023年

作者： Li, Pan Li, Jingya Li, Man Wang, Qianqian Wang, Juan Zhu, Yinbo Bu, Linfeng Zhang, Hanyuan Xu, Weiping Department of Pathology Anhui University of Chinese Medicine Hefei230012 China University of Science and Technology of China Hefei230026 China Department of Bioengineering The First Affiliated Hospital of USTC Division of Life Sciences and Medicine University of Science and Technology of China Anhui Hefei230001 China Department of Pharmacy Anhui University of Chinese Medicine Anhui Hefei230038 China CAS Key Laboratory of Mechanical Behavior and Design of Materials Department of Modern Mechanics CAS Center for Excellence in Complex System Mechanics University of Science and Technology of China Hefei230027 China Center of Medical Physics and Technology Hefei Institutes of Physical Science CAS Hefei230021 China Anhui Provincial Key Laboratory of Tumor Immunotherapy and Nutrition Therapy Anhui Provincial Hospital Anhui Hefei230001 China Gerontology Institute of Anhui Province Hefei230001 China University of Science and Technology of China China

In this work, we combined three-dimensional (3D) necklace-like Te-Au reticula as novel surface-enhanced Raman scattering (SERS) active substrates with oxidation-reduction displacement reactions to construct a molecular machine for SERS detection. The structurally tunable 3D necklace-like spatial structures generated more active ‘hot spots’ and thus enhanced the sensitivity of SERS signals. Besides, layers of ultrathin nanowires showed high sequence dependence which ensure the repeatability and abundant hotspots at interparticle gaps guarantee the high SERS performance of the substrate. A better localized surface plasmon resonance (LSPR) effect of the sensor was verified by finite-difference time-domain (FDTD) analysis in both Raman intensities and electromagnetic field distributions compared to the citrate-stabilized AuNPs and CTAB-protected AuNRs. The proposed strategy can also serve as a universally amplified and sensitive detection platform for monitoring different molecules, thus achieving an amplification detection of 3,3'-diethylthiatricarbocyanine iodide (DTTCI) are 1 nM and R6G with a low limit of detection of 1 pM. Especially, The intensity of the main vibration of R6G from 30 spots of SERS data with excellent reproducibility (relative standard deviation of 6.25%). High selectivity and accuracy of the SERS sensor were proved by practical analysis melamine (MM) in milk with a linear calibration curve (R2=0.9962) and a limit of detection of 0.75 mg/kg. Our research provides a new perspective to construct 3D SERS sensor from integrated structural design. © 2023, The Authors. All rights reserved.

关键词： Substitution reactions

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Structural design and strength analysis of multi-ring packed flywheel with heavy metal alloy segments 2

Structural design and strength analysis of multi-ring packed...

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2nd International Conference on Numerical Modelling in Engineering, NME 2019

作者： Jiang, L. Zhang, W. Wu, C.W. Zhang, L.P. Zhang, Y.X. Liu, Z.Y. National Key Laboratory of Science and Technology on Reactor System Design Technology Nuclear Power Institute of China Chengdu610041 China State Key Laboratory of Structural Analysis for Industrial Equipment Dalian University of Technology Dalian116024 China

Flywheel, as a kinetic energy storage and conversion device, has promising applications due to its high efficiency, no pollution and long lifetime. In particular, with a three-layer structure packed with heavy metal alloy middle layer, a flywheel can achieve both a large rotational inertia and a high energy density. To guarantee structural strength safety of this type of multi-ring packed flywheel operating at high temperature, structural and thermal stress analysis for a flywheel with a tungsten alloy layer sandwiched between two stainless steel layers is carried out using finite element method (FEM). Based on plane stress assumption, flywheel stress characteristic along radius under assembly force, centrifugal force and thermal loading is demonstrated. The results show that, the rise of temperature causes inconsistent thermal expansion between neighbouring layers and results in a large thermal stress. Particularly, a high circumferential tensile stress occurs in the middle layer. It is also found that, the segments of the middle tungsten alloy layer can efficiently relieve the inconsistent thermal expansion and lower the thermal stress. Moreover, the number of segments significantly influences the efficiency of thermal stress releasing and the reserved gap between adjacent segments significantly improves the contact pressure between inner hub and tungsten alloy layer. This work may provide reference for structural design of the multi-ring packed flywheels under thermal loading. © Published under licence by IOP Publishing Ltd.

关键词： Kinetics

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Development And Optimization of Airborne Display Scene Based on SCADE

Development And Optimization of Airborne Display Scene Based...

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science and technology Innovation (IAECST), International Academic Exchange Conference on

作者： Qian Song Li Zhang Ze Tian School of Electronic Information Xi'an Polytechnic University Xi' an Shaanxi China School of Electronic Information Xi' an Polytechnic University Xi' an Shaanxi China Key Laboratory of Aviation Science and Technology on Integrated Circuit and Micro-System Design Xi' an Shaanxi China

With the rapid development of avionics display field, the traditional graphics software development method can no longer meet the needs of high security and efficiency. This paper studies a development method based on SCADE Display, a high security graphics application development tool, analyses the principle and characteristics of SCADE Display, applies SCADE Display to design airborne display scene models, and tests, analyses and optimizes the process on a home-made test platform. Finally, the experimental results show that the optimized solution can effectively improve the development efficiency and graphics frame rate, and also verify the adaptability and functionality of the home-made platform.

关键词： Graphics Adaptation models Technological innovation Analytical models Codes Atmospheric modeling Optimization methods

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Ballistic performance of CFRP under normal and oblique impacts by square fragments: Experimental, numerical, and theoretical investigations

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Thin-Walled Structures 2025年 215卷

作者： Feng, Bo Dong, Yongxiang Min, Qiang Liu, Jian Shi, Xinping Tian, Yumo An, Fengjiang State Key Laboratory of Explosion Science and Safety Protection Beijing Institute of Technology Beijing 100081 China National Key Laboratory of Digital and Agile Aircraft Design Chengdu Aircraft Design & Research Institute Chengdu610091 China Beijing Institute of Electronic System Engineering Beijing 1000854 China

High-performance carbon fibre-reinforced polymer (CFRP) composites are commonly used as external protective structures in military and aerospace applications and are frequently subjected to impact from fragments or projectiles. This study investigated the damage mechanisms of CFRP laminates under normal and oblique impacts from square fragments. Impact tests were conducted on 3–9 mm CFRP laminates using 4 g and 7 g square fragments at velocities ranging from 100 to 1300 m/s and impact angles from 0° to 60° Finite element simulations based on yarn-scale models were also performed. The results revealed that under oblique penetration conditions, the fragment edge initially contacting the target plate caused deeper shear damage. An analytical model was developed to predict the residual velocity of the fragments and the ballistic limit velocity (BLV) of the CFRP laminates. The average error between the model predictions and experimental results was 8.42 %, whereas that between the predictions and simulation results was 3.69 %. Interestingly, the analysis revealed a non-zero minimum resistance angle for the laminate under square fragment impact, at which the BLV of the target plate was minimised. The predicted distribution range of the minimum resistance angle in this study was 23–28° The developed predictive model and identified "minimum resistance angle" provide theoretical foundations for protective engineering design, bridging laboratory research to real-world high-risk applications such as military and aerospace. © 2025 Elsevier Ltd

关键词： Military applications

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A Novel Torsion Instrument for Miniaturized Components Based on the Flexural Pivot

SSRN

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SSRN 2022年

作者： Liu, Dabiao Hu, Jianhui Liu, Hao Hu, Jiongjiong Luo, Tong Zhang, Zhiya Lei, Jian Hu, Peng Chen, Yanming He, Yuming School of Aerospace Engineering Huazhong University of Science and Technology Wuhan430074 China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment Wuhan430074 China System Design Institute of Hubei Aerospace Technology Academy Wuhan430040 China Hubei Standardization and Quality Institution Wuhan430060 China

Torque measurement plays a significant role in characterizing microelectromechanical systems with rotation components and torsional behaviours of slender structures. A high-sensitivity torque transducer based on the flexural pivot with a wide measurement range is addressed. The torque transducer consists of a cylindrical flexural pivot acting as the elastic element, and an optical angle measurement system including dual laser displacement sensors. The instrument can measure the torque accurately using the flexural pivot with a known torsional spring constant. By selecting suitable pivots, it allows for a vast torque capacity ranging from 1.94×10 -4 to 1.91×10 -2 Nm, corresponding to a resolution ranging from 1.94×10 -9 to 1.91×10 -7 Nm. Torsion tests on Nylon 6 filaments, PET ribbons, and copper wires were performed with the instrument. The practicality and applicability of the method are confirmed. The developed instrument is a helpful tool for characterizing the mechanical properties of miniaturized components. © 2022, The Authors. All rights reserved.

关键词： Torsional stress

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Flexible Strain Sensors Fabricated by Fused Deposition Modeling-Based Multimaterial 3D Printing with Conductive Polyurethane Composites*

Flexible Strain Sensors Fabricated by Fused Deposition Model...

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International Conference on Mechatronics and Machine Vision in Practice (M2VIP)

作者： Xiaodan Yang Huilin Ren Chenchen Wu Yi Xiong Qi Ge Southern University of Science and Technology Shenzhen China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen China Guangdong Provincial Key Laboratory of Human-Augmentation and Rehabilitation Robotics in Universities Southern University of Science and Technology Shenzhen China

ISBN: (纸本)9781665431545

Flexible strain sensors have attracted much attention due to their excellent stretchability, conformability and ability to measure large deformations. These sensors have found a wide range of applications, including health tracking, human-machine interaction, and human motion monitoring. However, current mass-production methods do not support the small-batch customization of flexible strain sensors, and the additional mounting step reduces the structural integrity. This paper presents a widely accessible approach for the rapid fabrication of flexible strain sensors that are directly printed onto objects in an on-demand and reliable manner by exploring the multimaterial fused deposition modeling techniques and optimizing the composition of functional filaments. Furthermore, the feasibility and effectiveness of the proposed method are demonstrated in the development of customized, flexible strain sensors that have complex sensing patterns and geometries.

关键词： Geometry Solid modeling Tracking Three-dimensional printing Strain measurement Capacitive sensors Sensors

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