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All-In-One Flexible MXene/PET Films via Scalable Scanning Centrifugal Casting for High Transparency and Ultra-Wide Multispectral Electromagnetic Responses

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Advanced science 2025年 e2501540页

作者： Zhang, Tian-Yu Zhao, Qiang-Qiang Sun, Bo Ahmed, Ibrar Liu, Ruijia Liu, Chi Wang, Han Pei, Songfeng Liu, Chang Zeng, You Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 China School of Physical Science and Technology ShanghaiTech University Shanghai 200031 China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen 518055 China

Highly integrated multifunctional materials are crucial for the development of next-generation aircraft and electronic communication devices. In this study, a novel ultra-thin MXene film with high optical transparency and broad multispectral electromagnetic responses is first fabricated using the scanning centrifugal casting (SCC) technique. The MXene-coated PET films significantly integrate transparency, UV-adsorption, infrared (IR) stealth, and electromagnetic shielding from gigahertz (GHz) to terahertz (THz) frequencies together to address the diverse demands of multifunctional applications. The all-in-one integrated flexible films exhibit excellent optoelectronic properties (sheet resistance of 163 Ω sq⁻¹ at 82% transparency with a figure of merit of 10.88), outstanding IR stealth (IR emissivity below 55%), and ultra-broad electromagnetic shielding performance (shielding effectiveness of over 10 dB across GHz to THz frequencies). This remarkable performance is attributed to the intrinsic multifunctionality of MXene, ultra-thin thickness, horizontal alignment of nanosheets, and strong interfacial interactions achieved during the SCC process. These all-in-one flexible MXene films exhibit great potential for applications in aircraft windows, wearable electronics, and next-generation communication technology. © 2025 The Author(s). Advanced science published by Wiley-VCH GmbH.

关键词： electromagnetic shielding multifunctionality MXene-based film optical transparency scanning centrifugal casting

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Experimental research on the startup and shutdown heat transfer behavior of the coupling system of multi-stage heat pipes and radiators

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Annals of Nuclear Energy 2025年 222卷

作者： Limin Liu Zhengyu Du Ziang Guo Ziyin Liu Xiaoqiang He Hanyang Gu School of Nuclear Science and Engineering Shanghai Jiao Tong University China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China China

The heat pipe cooled reactor (HPR) offers high safety and compactness for space applications. This study experimentally investigates the coupled transient thermal behavior of the primary sodium heat pipe, thermoelectric generator (TEG), and secondary potassium heat pipe radiators during startup and shutdown. The primary heat pipe reached ∼700 °C at the evaporator within 3 h, while the secondary radiators exhibited delayed activation, with most condensing sections exceeding 299 °C after 21 h. A sonic limit effect caused local thermal and pressure drops at 800 mm. 75–80 % of input power was dissipated radiatively, exhibiting a thermal lag due to system inertia. During shutdown, the primary heat pipe responded rapidly to power reduction, while secondary heat pipe radiators showed accelerated cooling after passing their transition temperature. Stepwise power reductions led to faster temperature drops in the primary pipe than constant-rate reduction conditions. These results offer insights into HPR thermal dynamics for space system design.

关键词： Space applications

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Positioning Control for Voice Coil Motor Using Unbalanced Multilevel Inverter Topology

Positioning Control for Voice Coil Motor Using Unbalanced Mu...

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International Conference on Mechatronics (ICM)

作者： Gaku Takei Hidemine Obara Ryo Haneda Takahiro Nozaki Graduate School of Science and Technology Keio University Yokohama Japan Department of Physics Electrical and Computer Engineering Yokohama National University Yokohama Japan Department of System Design Engineering Keio University Yokohama Japan

ISBN: (数字)9798331533892

ISBN: (纸本)9798331533908

This article proposes a new multi-level inverter (MLI) based on flying capacitor inverter (FCI), with focused on high-precision positioning control for a voice coil motor (VCM). Multi-level inverters (MLIs) have the characteristic that increasing the number of output voltage levels reduces the output voltage error. However, as the number of levels increases, the number of circuit elements increases, and the circuit becomes more complex. In addition, the output voltage amplitude for each level is constant in conventional inverters. As a result, such as high-precision positioning control of VCM, designing an appropriate inverter for a reference wave that contains a large amount of low-voltage components increases the number of circuit elements. Therefore, this paper proposes a MLI with two unbalanced dc-input voltages, referred to as unbalanced MLIs (UMLIs) hereinafter. This topology uses two different dc-input voltages, and it is possible to reduce the output voltage level in extremely low-voltage range compared to other voltage levels. Simulation results when the high-precision positioning control of the VCM confirm that the proposed UMLIs improves the control performance compared to the conventional FCIs with equal number of output voltage levels and uniform level widths.

关键词： Coils Low voltage Simulation Switches Multilevel inverters Motors Topology Sensors Voltage control Motion control

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Study on hydrogen stratification and erosion process in Chinese SMR containment under severe accident scenario

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International Journal of Advanced Nuclear reactor design and technology 2020年 2卷 43-51页

作者： Fan, Yang Songwei, Li Wei, Zeng Zhifang, Qiu Jian, Deng Science and Technology on Reactor System Design Technology Laboratory NPIC China Design and Research Sub-institute NPIC China

During postulated severe accident, large amount of hydrogen-vapor mixture will be released into the containment and inflammable gas mixture may form. Once the gas will be ignited, the generated pressure loads can jeopardize the integrity of the internal structures. As the local accumulation of high content hydrogen related much to the stratification and erosion mechanism, it is therefore of interest whether a stratification of gas layers will form within small containment. In this study, a stratification/erosion experiment is performed and the criteria under which the steady stratification will be destroyed by steam jet discussed. Then the simulation method is validated by the experimental data. At last, several severe accident scenarios for Chinese SMR performed and one of them is adopted for containment hydrogen CFD analysis. It is shown that high content of hydrogen will form in the upper part of the containment, and clear gas stratification will form, such stratification will be enhanced due to the condensation effect of steel containment wall. © 2020

关键词： Hydrogen

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DeepSeek: Paradigm Shifts and Technical Evolution in Large AI Models

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IEEE/CAA Journal of Automatica Sinica 2025年第5期12卷 841-858页

作者： Xiong, Luolin Wang, Haofen Chen, Xi Sheng, Lu Xiong, Yun Liu, Jingping Xiao, Yanghua Chen, Huajun Han, Qing-Long Tang, Yang Ministry of Education Engineering Research Center of Process System Engineering East China University of Science and Technology Key Laboratory of Smart Manufacturing in Energy Chemical Process Shanghai 200237 China College of Design and Innovation Tongji University Shanghai 200092 China School of Computer Science Fudan University Shanghai Key Laboratory of Data Science Shanghai 200433 China School of Software Beihang University Beijing 100191 China School of Information Science and Engineering East China University of Science and Technology Shanghai 200237 China College of Computer Science and Technology Zhejiang University AZFT Joint Laboratory for Knowledge Engine Hangzhou Innovation Center Hangzhou 310058 China School of Science Computing and Engineering Technologies Swinburne University of Technology Melbourne 3122 VIC Australia

DeepSeek, a Chinese artificial intelligence (AI) startup, has released their V3 and R1 series models, which attracted global attention due to their low cost, high performance, and open-source advantages. This paper begins by reviewing the evolution of large AI models focusing on paradigm shifts, the mainstream large language model (LLM) paradigm, and the DeepSeek paradigm. Subsequently, the paper highlights novel algorithms introduced by DeepSeek, including multi-head latent attention (MLA), mixture-of-experts (MoE), multi-token prediction (MTP), and group relative policy optimization (GRPO). The paper then explores DeepSeek's engineering breakthroughs in LLM scaling, training, inference, and system-level optimization architecture. Moreover, the impact of DeepSeek models on the competitive AI landscape is analyzed, comparing them to mainstream LLMs across various fields. Finally, the paper reflects on the insights gained from DeepSeek's innovations and discusses future trends in the technical and engineering development of large AI models, particularly in data, training, and reasoning. © 2014 Chinese Association of Automation.

关键词： DeepSeek large AI models reasoning capability reinforcement learning test-time scaling

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Experimental study on aerosol behavior in water pool scrubbing under severe accident conditions

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International Journal of Advanced Nuclear reactor design and technology 2020年 2卷 111-116页

作者： Xu, Youyou Deng, Jian Zou, Zhiqiang Jiang, Guangming Wu, Xiaoli Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China

In severe accident of nuclear power plant, large quantities of steam and radioactive aerosol may release to the containment. Meanwhile, hydrogen may be generated by zirconium-steam reaction and released to the containment and mixed with steam and air to form a flammable mixture (H2, H2O, Air) which might combust even explode to generate mechanical and thermal load on containment. In this situation, timely containment venting strategies (CVS) is an important and effective measure to release the containment atmosphere to decrease the pressure. In order to remove the radioactive aerosol particles and cool the high temperature mixture, the containment atmosphere are vented to the water pool. This paper mainly investigated the behavior of aerosol scrubbing in water pool. The effects of submergence depth, aerosol particle diameter and aerosol concentration were preliminary studied by conducting a series of experiments. The results illustrate that the scrubbing efficiency of gas jet injection into water pool almost larger than 90%. And the aerosol particle diameter and submergence depth have significant influence on decontamination factor (DF). This paper provide data basis and reference to the subsequent work. © 2020

关键词： Aerosols

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Quantitative study on energy distribution and mode conversion of ultrasonic guided waves interacting with stepped and tapered transition regions

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Applied Acoustics 2025年 236卷

作者： Tian, Yuan Yu, Ximing Guo, Yudong Zhao, Lin Liu, Menglong Guo, Haotian Zhang, Jifeng Zhou, Limin College of Aerospace and Civil Engineering Harbin Engineering University Harbin150001 China Wuhan Aviation Instrument Co. Ltd. Wuhan430074 China School of Robotics and Advanced Manufacturing Harbin Institute of Technology Shenzhen518055 China School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China

Ultrasonic guided waves (UGWs) are extensively used in structural health monitoring and nondestructive testing, particularly for complex structures such as lap joints, icing plates, and composite interfaces. This study comprehensively investigates the mode conversion, reflection, and transmission of UGWs both at the stepped and tapered transition region, where geometric discontinuity causes energy redistribution among various modes of reflected and transmitted UGWs. The Frequency Domain Finite Element method is employed to quantitatively analyse the mode energy distribution across a frequency range of 0 ∼ 3 MHz, with Mode S0 as the incident UGW. The results demonstrate that the energy distribution of transmitted UGW modes follows the phase velocity matching principle, whereas the reflected UGW energy exhibits no discernible pattern. Both the linearly and curvedly tapered transition regions improve the energy transmission efficiency by mitigating mode mismatches. Furthermore, increasing the length-to-thickness ratio of linearly tapered transition enhances the energy transmission, reaching over 99% at all frequencies when the ratio exceeds 5. The validation is conducted with the Time Domain Finite Element method and experiment. These findings provide valuable insights for optimizing the selection of UGWs, improving the accuracy and effectiveness of monitoring at stepped and tapered structures. © 2025 Elsevier Ltd

关键词： Guided electromagnetic wave propagation

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Investigation into the flow and heat transfer characteristics in liquid metal cooled narrow rectangular channel with rough surfaces

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Case Studies in Thermal Engineering 2025年 72卷

作者： Xue Zhang Wenpei Feng Xiaolong Yang Hongxing Yu Jian Deng Sijia Du Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu 610213 China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu 610059 China

This study investigates the impact of roughness elements on fluid flow and heat transfer characteristics in narrow rectangular channels. The results show that when the fluid flows over roughness elements, it induces vortices near the wall, disturbing the flow and heat transfer boundary layers. This enhances heat transfer while simultaneously increasing flow resistance. Among different roughness types, cylindrical roughness elements demonstrate a more substantial improvement in both heat transfer efficiency and friction factor compared to cubic elements. The Nusselt number is found to be non-monotonic related to the height of the roughness elements, while the friction factor increases with height. Additionally, larger roughness element diameters lead to higher Nusselt numbers and friction factors. Further analysis reveals that under conditions where the spacing and height remain unchanged, an increase in the roughness elements quantity results in a diminished enhancement of heat transfer. The base edge length of the roughness elements has a more significant impact on heat transfer capacity than the additional heated area, while the additional area primarily affects the flow resistance, causing the friction factor to increase with the number of roughness elements.

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Deformation Analysis and Prediction of Drop-Stitch Reinforced Inflatable Robot Link for 1DOF and 2DOF Motion

Deformation Analysis and Prediction of Drop-Stitch Reinforce...

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IEEE/SICE International Symposium on system Integration

作者： Gangadhara Naga Sai Gubbala Masato Nagashima Hiroki Mori Young Ah Seong Hiroki Sato Ryuma Niiyama Yuki Suga Tetsuya Ogata Dept. of Intermedia Art and Science School of Fundamental Science and Eng. Waseda University Tokyo Japan Institute for AI and Robotics Future Robotics Organization Waseda University Tokyo Japan Dept. of System Design Faculty of Eng. and Design Hosei University Tokyo Japan School of Project Design Miyagi University Miyagi Japan School of Science and Technology Meiji University Tokyo Japan Waseda Research Institute for Science and Engineer- ing (WISE) Waseda University Tokyo Japan National Institute of Advanced Industrial Science and Technology (AIST) Tokyo Japan

ISBN: (数字)9798331531614

ISBN: (纸本)9798331531621

In this study, we observe the dynamic behavior of an inflatable robot arm with an internally reinforced drop-stitch structure. We examine the deformation during motion of 1 and 2 degrees of freedom (DOF) for an inflatable body. The inflatable robot arm has a soft inflatable body as links and rigid servo actuators as joints. We implemented a sinusoidal motion for inflatable links for various payload conditions and analyzed them using a Motion Capture system. To estimate the dynamic deformation of the balloon in motion, we have defined a Deformation Index (DI) metric. Angle, current of the actuator (servo), and DI are used as input to polynomial regression to predict the end effector position. With this analysis, we can understand the complexity of modeling the nonlinear behavior of inflatable links for multi-DOF motion. We observed DI helps improve the prediction of the end effector position by including deformation information. However, the results demonstrate the limitations of polynomial regression analysis of an internally reinforced inflatable robot arm link.

关键词： Actuators Deformation Dynamics system integration Arms Polynomials End effectors Regression analysis Servomotors Payloads

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Advancements in the research of high-temperature gas-cooled reactor fuel via additive manufacturing techniques

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International Journal of Advanced Nuclear reactor design and technology 2024年第1期6卷 14-20页

作者： Liao, Haoyu Zhang, Ting Li, Chenxi Tang, Changbin Li, Yuanming Chen, Ping Nuclear Power Institute of China Science and Technology on Reactor System Design Technology Laboratory Chengdu610200 China

Recent advances in high-temperature gas-cooled reactor fuel research have captured the global spotlight, as modern operating contexts demand innovative responses to unprecedented challenges. This article offers an overview of contemporary directions in high-temperature gas-cooled reactor fuel design worldwide, pinpointing the shared operational demands and development patterns characteristic of these advanced fuels. It presents an innovative advanced fuel design, which incorporates multi-layer coated particles to boost safety and employs high-temperature-resistant silicon carbide (SiC) ceramics, seamlessly integrated with cutting-edge additive manufacturing (AM) techniques. This design heralds a shift toward modular fuel element solutions that are easily scalable, supporting the diverse array of advanced reactors and marking a significant step forward in the quest for high-temperature gas-cooled reactor fuel technologies. © 2024 Xi'an Jiaotong University

关键词： Silicon carbide

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