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27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019

作者： Yin, Shasha Yan, Sun Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan China

ISBN: (纸本)9784888983051

Interest in evaluation of reactor response and off-site consequences following beyond design basis accidents has significantly increased after Fukushima. MELCOR is an advanced computational aid that has been widely used and adapted to various reactor designs for severe core damage analyses. This paper summarizes the core thermal hydraulic response for a hypothetical severe accident caused by station blackout at a small modular reactor using MELCOR. The results show that: After a severe accident in SMRs, the passive core cooling system can cool the core by the natural circulation of water, extend the time of core uncover. The time of bottom head failed delays nearly 64000s. So the passive core cooling system have great mitigation effect on the severe accident induced by station blackout. The analyses are focused on safety assessment of the reactor core for severe accidents and are part of the overall evaluation of safety features of the small modular reactor for residual risk posed by severe accidents. Copyright © 2018-2019 by JSME

关键词： Thermoelectric equipment

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How does spatial structure affect psychological restoration? A method based on Graph Neural Networks and Street View Imagery

arXiv

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arXiv 2023年

作者： Ma, Haoran Zhang, Yan Liu, Pengyuan Zhang, Fan Zhu, Pengyu Division of Public Policy Hong Kong University of Science and Technology Hong Kong School of Design Jiangnan University Wuxi China Institute of Space and Earth Information Science The Chinese University of Hong Kong Hong Kong School of Geographical Sciences Nanjing University of Information Science and Technology China Institute of Remote Sensing and Geographical Information System School of Earth and Space Sciences Peking University China

The Attention Restoration Theory (ART) presents a theoretical framework with four essential indicators (being away, extent, fascinating, and compatibility) for comprehending urban and natural restoration quality. However, previous studies relied on non-sequential data and non-spatial dependent methods, which overlooks the impact of spatial structure—defined here as the positional relationships between scene entities—on restoration quality. The past methods also make it challenging to measure restoration quality on an urban scale. In this work, a spatial-dependent graph neural networks (GNNs) approach is proposed to reveal the relation between spatial structure and restoration quality on an urban scale. Specifically, we constructed two different types of graphs at the street and city levels. The street-level graphs, using sequential street view images (SVIs) of road segments to capture position relationships between entities, were used to represent spatial structure. The city-level graph, modeling the topological relationships of roads as non-Euclidean data structures and embedding urban features (including Perception-features, Spatial-features, and Socioeconomic-features), was used to measure restoration quality. The results demonstrate that: 1) spatial-dependent GNNs model outperforms traditional methods (Acc = 0.735, F1 = 0.732);2) spatial structure portrayed through sequential SVIs data significantly influences restoration quality;3) spaces with the same restoration quality exhibited distinct spatial structures patterns. This study clarifies the association between spatial structure and restoration quality, providing a new perspective to improve urban well-being in the future. © 2023, CC BY.

关键词： Restoration

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GLUING FORMULA FOR AN INVARIANT RELATED TO THE CHERN-SIMONS PERTURBATION THEORY

arXiv

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arXiv 2023年

作者： Kitano, Teruaki Shimizu, Tatsuro Department of Information Systems Science Faculty of Science and Engineering Soka University Tangicho 1-236 Tokyo Hachioji192-8577 Japan School of System Design and Technology Tokyo Denki University 5 Senju Asahi-cho Adachi-ku Tokyo120-8551 Japan

The Chern-Simons perturbation theory gives an invariant d(M, ρ) for a pair of a closed oriented 3-manifold M and a representation ρ of the fundamental group. We generalize d(M, ρ) for compact oriented 3-manifolds with torus boundaries. Further we give a gluing formula for d(M, ρ).MSC Codes 57K31, 57M05 Copyright © 2023, The Authors. All rights reserved.

关键词： Perturbation techniques

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Research on boundary disposal of pipes decoupling based on PEPs 27

Research on boundary disposal of pipes decoupling based on P...

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27th International Conference on Nuclear Engineering: Nuclear Power Saves the World!, ICONE 2019

作者： Yanli, Yuan Feng, Yuan Xinjun, Wang Xiaoming, Bai Rui, Zhang Liangang, Zheng Xifeng, Lu Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan China

ISBN: (纸本)9784888983051

Generally, one of the remarkable characteristics is: compared with the main pipe, the sizes of the auxiliary piping are smaller, which makes the auxiliary piping satisfy the criteria to be decoupled from the main piping. So when the auxiliary pipes connected to the main piping are analyzed, there are two methods: one is that the auxiliary pipe is analyzed connected to the main piping, and the other is that the auxiliary pipe is analyzed not to be connected to the main pipe. Because the response spectrum at the location of the connection of the auxiliary pipes and the main piping is lacked, the previous choice is usually adopted. At present, the main software used for analyzing the stress of the pipes in nuclear power station is PEPS, but when the PEPS is adopted to analyze the small pipes, if the small pipes are analyzed connected to the main pipe, the boundaries of the thermal analysis and those of the seismic analysis are different, so the two kinds of analysis cannot be carried out at the only one model. That is, when the small pipe is analyzed connected to the main piping, two models are needed for thermal analysis and the seismic analysis, and then the results of the thermal analysis and the seismic analysis are distilled separately, and the results are combined according to determinate mode, and then the combined results are evaluated according to the criterion. Consequently, not only is the model complex, but also the combination of the seismic stress and the thermal stress is not convenient in the previous method. In the latter method, the auxiliary pipe is not connected to the main piping, accordingly, not only is the modal simple, but also the combination of the seismic stress and the thermal stress is convenient. The only problem which is needed to be solved is the seismic response spectrum and the displacements, and an approach to solve the problem is presented in the article. A response spectrum calculation method is obtained based on the single oscilla

关键词： Thermoanalysis

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A compact fluorescence/circular dichroism dual-modality probe for detection, differentiation, and detoxification of multiple heavy metal ions via bond-cleavage cascade reactions

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Chinese Chemical Letters 2021年第12期32卷 3876-3881页

作者： Junwei Chen Na Wang Hongjuan Tong Chao Song Huijuan Ma Yajun Zhang Feng Gao Huan Xu Wei Wang Kaiyan Lou State Key Laboratory of Bioengineering Reactor.Shanghai Key Laboratory of New Drug Design and Shanghai Key Laboratory of Chemical BiologySchool of PharmacyEast China University of Science & TechnologyShanghai 200237China School of Pharmacy Collaborative Innovation Center of Green Manufacturing Technology for Traditional Chinese Medicine in Shaanxi ProvinceShaanxi Institute of International Trade&CommerceXi'an 712046China Department of Pharmacology and Toxicology and BIO5 Institute University of ArizonaTucson AZ 85721-0207United States

Selective detection of multiple analytes in a compact design with dual-modality and theranostic features presents great challenges. Herein, we wish to report a coumarin-thiazolidine masked D-penicillamine based dual-modality fluorescent probe COU-DPA-1 for selective detection, differentiation, and detoxification of multiple heavy metal ions(Ag^(+), Hg^(2+), Cu^(2+)). The probe shows divergent fluorescence(FL)/circular dichroism(CD) responses via divergent bond-cleavage cascade reactions(metal ion promoted C-S cleavage and hydrolysis at two distinctive cleavage sites): FL “turn-off” and CD “turn-on” for Ag+(no hydrolysis), FL “turn-on” and CD “turn-off” for Hg^(+)(imine hydrolysis), and FL “self-threshold ratiometric” and CD “turn-off” for excess Cu^(2+)(lactone and imine hydrolysis), providing the first example of a fluorescence/CD dual-modality probe for multiple species with complimentary responses. Moreover, the bond-cleavage cascade reactions also lead to the formation of D-penicillamine heavy metal ion complexes for potential detoxification treatments.

关键词： Fluorescent probe Circular dichroism Heavy metal ions Dual-modality Detoxification Cascade reaction Divergent responses

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Fluorescent Polymeric Nano-Thermometer for 3D Temperature Distribution and Dynamic Monitoring of Chimeric Tumor Microenvironment 22

Fluorescent Polymeric Nano-Thermometer for 3D Temperature Di...

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22nd International Conference on Solid-State Sensors, Actuators and Microsystems, Transducers 2023

作者： Kumar, Ashish Goudar, Venkanagouda S. Kaladharan, Kiran Santra, Tuhin Subhra Tseng, Fan-Gang Department Of Engineering And System Science National Tsing Hua University Hsinchu30013 Taiwan Department Of Engineering Design Indian Institute Of Technology Madras Chennai600036 India Institute Of Nano Engineering And Microsystems National Tsing Hua University Hsinchu30013 Taiwan Research Center For Applied Sciences Academia Sinica Taipei11529 Taiwan Frontier Research Center On Fundamental And Applied Sciences Of Matters National Tsing Hua University Hsinchu30013 Taiwan

ISBN: (纸本)9784886864352

In this study, custom-designed biocompatible Fluorescent Polymeric Nano Thermometers (FPNTs), are capable of operating with a wide temperature sensing range (25 to 100 °C) and are stable in pH, ionic strength, and oxidative stress. The FPNTs (180±17 nm) with persistent fluorescence are composed of temperature-sensitive rhodamine B (Rh-B) fluorophore and F-127 polymer which was conjugated and cross-linked with Urea-Paraformaldehyde resins using sol-gel method which were utilized to monitor the temperature gradient in co-cultured 3D tumor spheroids and the temperature difference between the core to the periphery was 2.9 °C. © 2023 IEEJ.

关键词： 3D co-culture spheroids 3D-Temperature dye micelle polymer complex Nano temperature sensors nano thermometry Rh-B

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Cerebellum: Reinforcement Learning Robotic Arm Control system with Hardware Adaptability

Research Square

引用

Research Square 2023年

作者： Zhang, Shizhuo Fang, Yue Saini, Sujata Liu, Jia Wu, Xibao Automation School Beijing Information Science and Technology University No 12 XiaoYing East Road Beijing100192 China Department of System Design Tokyo Metropolitan University 1-1 Minami-Osawa Hachioji-shi Tokyo192-0397 Japan

This paper proposes a meta-learning and reinforcement-learning based control system"Cerebellum" for robotic arms to address the issue of adapting to hardware parameter changes. By leveraging the concept of meta-learning, the system achieves adaptive control by learning from few samples. Experimental results show our"Cerebellum" reach 90.09% accuracy in a simulation environment with controlling newly unseen robotic arm. However, challenges remain in hardware experiments due to image distortions and Mechanical collide issues. Further research is needed to overcome these challenges. © 2023, CC BY.

关键词： Robotic arms

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design and Operation of Autonomous Wheelchair Towing Robot

arXiv

引用

arXiv 2023年

作者： Kang, Hyunwoo Shin, Jaeho Shin, Jaewook Jang, Youngseok Lee, Seung Jae Department of Mechanical System Design Engineering Seoul National University of Science and Technology Gongrung-ro 232 Seoul01811 Korea Republic of Department of Aerospace Engineering Seoul National University Gwanak-ro 1 Seoul05116 Korea Republic of

In this study, a new concept of a wheelchair-towing robot for the facile electrification of manual wheelchairs is introduced. The development of this concept includes the design of towing robot hardware and an autonomous driving algorithm to ensure the safe transportation of patients to their intended destinations inside the hospital. We developed a novel docking mechanism to facilitate easy docking and separation between the towing robot and the manual wheelchair, which is connected to the front caster wheel of the manual wheelchair. The towing robot has a mecanum wheel drive, enabling the robot to move with a high degree of freedom in the standalone driving mode while adhering to kinematic constraints in the docking mode. Our novel towing robot features a camera sensor that can observe the ground ahead which allows the robot to autonomously follow color-coded wayfinding lanes installed in hospital corridors. This study introduces dedicated image processing techniques for capturing the lanes and control algorithms for effectively tracing a path to achieve autonomous path following. The autonomous towing performance of our proposed platform was validated by a real-world experiment in which a hospital environment with colored lanes was created. A video demonstration of our robot can be found at https://***/watch?v=RdnuhTjrMQc. © 2023, CC BY-NC-ND.

关键词： Wheelchairs

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On the Information Freshness of A Two-Sensor Status Update system

On the Information Freshness of A Two-Sensor Status Update S...

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IEEE Conference on Vehicular technology (VTC)

作者： Tianqing Yang Zhengchuan Chen Howard H. Yang Nikolaos Pappas Min Wang Yunjian Jia Tony Q. S. Quek School of Microelectronics and Communication Engineering Chongqing University Chongqing China Zhejiang University/University of Illinois at Urbana-Champaign Institute Zhejiang University Zhejiang China Department of Computer and Information Science Linköping University Linköping Sweden School of Optoelectronics Engineering Chongqing University of Posts and Telecommunications Chongqing China Information System Technology and Design Pillar Singapore University of Technology and Design Singapore

This work studies the average Age of Information (AoI) of a remote monitoring system in which two sensors observe the same physical process and update the status to a common monitor using orthogonal channels. While using redundant devices to update the status of a process can improve the information timeliness at the monitor, the out-of-order arrivals of updates impose a challenge to the AoI analysis. We first model the system as two parallel M/M/1/1 queues. By leveraging tools from stochastic hybrid systems, we obtain analytically the average AoI of the system. In particular, when the arrival or service rates are the same for the two sensors, the average AoI is given in closed form. Our analysis reveals that the average AoI of the considered system is reduced by 16.44% compared to the single-sensor system when the arrival and service rates are equal to 1. Numerical results show that the considered system outperforms the M/M/2 system in average AoI at high arrival rates.

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Fabrication of Laser-Induced Graphene-Based Diffractive Optical Device Using Femtosecond Laser

Fabrication of Laser-Induced Graphene-Based Diffractive Opti...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Younggeun Lee Dongwook Yang Han Ku Nam Truong-Son Dinh Le Young-Ryeul Kim Byunggi Kim Hongki Yoo JooHyung Lee Hyo-sang Yoon Seung-Woo Kim Young-Jin Kim Department of Mechanical Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea Institute of Industrial Science The University of Tokyo Tokyo Japan Department of Mechanical System and Design Engineering Seoul National University of Science and Technology Seoul Republic of Korea Department of Aerospace Engineering Korea Advanced Institute of Science and Technology (KAIST) Daejeon Republic of Korea

This is a study to generate laser-induced graphene on colorless polyimide using a femtosecond laser, and to find applications and applications for it as various types of Fresnel zone plates and diffractive optical dev...

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