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Improvements of the CMFD acceleration capability of OpenMOC

Improvements of the CMFD acceleration capability of OpenMOC

2019 International Conference on Mathematics and Computational Methods Applied to Nuclear science and Engineering, M and C 2019

作者： Wu, Wenbin Giudicelli, Guillaume Smith, Kord Forget, Benoit Yao, Dong Luo, Qi Department of Nuclear Science and Engineering Massachusetts Institute of Technology 77 Massachusetts Ave CambridgeMA02139 United States Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China NO. 328 Section 1 Changshun Ave Shuangliu District Chengdu Sichuan Province610213 China

ISBN: (纸本)9780894487699

Due to its computational efficiency and geometrical flexibility, the Method of Characteristics (MOC) has been widely used for light water reactor lattice physics analysis. Usually acceleration methods are necessary for MOC to achieve acceptable convergence on practical reactor physics problems. Among them, Coarse Mesh Finite Difference (CMFD) is very popular and can drastically reduce the number of transport iterations. In OpenMOC, CMFD acceleration was implemented but had the limitation of supporting only a uniform CMFD mesh, which would often lead to splitting MOC source regions, thus creating an unnecessary increase in computation and memory use. In this study, CMFD acceleration with a nonuniform Cartesian mesh is implemented into OpenMOC. We also propose a quadratic fit based CMFD prolongation method in the axial direction to further improve the acceleration when multiple MOC source regions are contained in one CMFD coarse cell. Numerical results are presented to demonstrate the improvement of the CMFD acceleration capability in OpenMOC in terms of both efficiency and stability. © 2019 American Nuclear Society. All rights reserved.

关键词： Acceleration

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Reconfiguration of Non-crossing Spanning Trees

arXiv

引用

arXiv 2022年

作者： Aichholzer, Oswin Ballinger, Brad Biedl, Therese Damian, Mirela Demaine, Erik D. Korman, Matias Lubiw, Anna Lynch, Jayson Tkadlec, Josef Uno, Yushi University of Technology Graz Austria Cal Poly Humboldt United States University of Waterloo Canada Villanova University United States MIT Computer Science and Artificial Intelligence Laboratory United States Siemens Electronic Design Automation United States Harvard Unversity United States Osaka Metropolitan University Japan

For a set P of n points in the plane in general position, a non-crossing spanning tree is a spanning tree of the points where every edge is a straight-line segment between a pair of points and no two edges intersect except at a common endpoint. We study the problem of reconfiguring one non-crossing spanning tree of P to another using a sequence of flips where each flip removes one edge and adds one new edge so that the result is again a non-crossing spanning tree of P. There is a known upper bound of 2n − 4 flips [Avis and Fukuda, 1996] and a lower bound of 1.5n − 5 flips. We give a reconfiguration algorithm that uses at most 2n − 3 flips but reduces that to 1.5n − 2 flips when one tree is a path and either: the points are in convex position;or the path is monotone in some direction. For points in convex position, we prove an upper bound of 2d − Ω(log d) where d is half the size of the symmetric difference between the trees. We also examine whether the happy edges (those common to the initial and final trees) need to flip, and we find exact minimum flip distances for small point sets using exhaustive search. Copyright © 2022, The Authors. All rights reserved.

关键词： Machine learning

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Neural Network-Cascade UDE Based Tracking Control of Leader-Follower Agents with Compound Uncertainties

Neural Network-Cascade UDE Based Tracking Control of Leader-...

引用

Computers and Automation (CompAuto), International Conference on

作者： Tong Li Weihao Li Zhiqiang Li Mengji Shi Boxian Lin Zixuan Liu AVIC Chengdu Aircraft Design and Research Institute Chengdu China Aircraft Swarm Intelligent Sensing and Cooperative Control Key Laboratory of Sichuan Province University of Electronic Science and Technology of China Chengdu China

ISBN: (纸本)9781665423724

This paper concerns with the multi-agent distributed leader-follower tracking control problems in the presence of compound uncertainties. These unknown time-varying parts not only lie in the both integral units of the second-order follower dynamics, but also show up in the leader’s kinematics. A cascade uncertainty and disturbance estimator (CUDE) based backstepping controller is designed for the followers, which is capable of handling the model uncertainties and input disturbances that respectively appearing in their first-and second-order integral units. However, UDE based methods require accurate modeling of the control system, while the leader is not controllable. Thus, for the leader, the uncertain parts are compensated by constructing a neural network (NN) estimation mechanism. Adaptive estimation parameters are designed according to Lyapunov stability theories to enhance the robustness of the system. The combination of NN and CUDE requires less computational resource than conventional NN-based methods while enabling a valuation of the uncertainty in the leader’s equation. Finally, a numerical simulation is conducted to verify the effectiveness of the control scheme.

关键词： Adaptation models Uncertainty Artificial neural networks Switches Numerical simulation Control systems Robustness

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High-performance non-Fermi-liquid metallic thermoelectric materials

arXiv

引用

arXiv 2022年

作者： Dong, Zirui Zhang, Yubo Luo, Jun Jiang, Ying Yu, Zhiyang Zhao, Nan Wu, Liusuo Ruan, Yurong Zhang, Fang Guo, Kai Zhang, Jiye Zhang, Wenqing School of Materials Science and Engineering Shanghai University Shanghai200444 China Department of Materials Science and Engineering Department of Physics Shenzhen Institute for Quantum Science and Engineering Southern University of Science and Technology Shenzhen518055 China Shenzhen Municipal Key-Lab for Advanced Quantum Materials and Devices Guangdong Provincial Key Lab for Computational Science and Materials Design Southern University of Science and Technology Shenzhen518055 China Materials Genome Institute Shanghai University Shanghai200444 China State Key Laboratory of Photocatalysis on Energy and Environment College of Chemistry Fuzhou University Fuzhou350002 China School of Physics and Materials Science Guangzhou University Guangzhou510006 China

Searching for high-performance thermoelectric (TE) materials in the paradigm of narrow-bandgap semiconductors has lasted for nearly 70 years and is obviously hampered by a bottleneck of research now1. Here we report on the discovery of a few metallic compounds, TiFexCu2x-1Sb (x = 0.70, 0,75, 0.80) and TiFe1.33Sb, showing the thermopower exceeding many TE semiconductors and the dimensionless figure of merits zTs comparable with the state-of-the-art TE materials. A quasi-linear temperature (T) dependence of electrical resistivity in 2 K - 700 K and the logarithmic T-dependent electronic specific heat at low temperature are also observed to coexist with the high thermopower, highlighting the strong intercoupling of the non-Fermi-liquid (NFL) quantum critical behavior2 of electrons with TE transports. Electronic structure analysis reveals the existence of fluctuating Fe-eg-related local magnetic moments, Fe-Fe antiferromagnetic (AFM) interaction at the nearest 4c-4d sites, and two-fold degenerate eg orbitals antiferromagnetically coupled with the dual-type itinerant electrons close to the Fermi level, all of which infer to a competition between the AFM ordering and Kondo-like spin compensation as well as a parallel two-channel Kondo effect. These effects are both strongly meditated by the structural disorder due to the random filling of Fe/Cu at the equivalent 4c/4d sites of the Heusler crystal lattice. The temperature dependence of magnetic susceptibility deviates from ideal antiferromagnetism but can be fitted well by x(T) = 1/(θ + BTα), seemingly being consistent with the quantum critical scenario of strong local correlation as discussed before3-5. Our work not only breaks the dilemma that the promising TE materials should be heavily-doped semiconductors, but also demonstrates the correlation among high TE performance, NFL quantum criticality, and magnetic fluctuation, which opens up new directions for future research. Copyright © 2022, The Authors. All rights reserv

关键词： Magnetic susceptibility

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Dynamic analysis and neural adaptive control of multi-load coupled tracking system under foundation motion excitation

引用

Ain Shams Engineering Journal 2025年第9期16卷

作者： Yu Chen KunKun Li Mingliang Xie Xinyue Chen Guolai Yang Xiaofeng Zou Jinfeng Liu Dejun Yan School of Mechanical Engineering Jiangsu University of Science and Technology Zhenjiang 212100 China Guangdong Provincial Key Laboratory of Advanced Welding Technology for Ships CSSC Huangpu Wenchong Shipbuilding Company Limited Guangzhou 510720 China Jiangsu Provincial Naval Architecture and Ocean Engineering Design and Research Institute Zhenjiang 212021 China School of Mechanical Engineering Nanjing University of Science and Technology Nanjing 210094 China

For the high-precision control problem of multi-load coupled tracking systems under foundation motion excitation, the multi-load coupled tracking system is simplified into two independent sets of two inertia servo systems through forward and inverse kinematics solutions. The nonlinear dynamic models of the system with lumped uncertainty are derived and the lumped uncertainty is estimated using a class of BP neural networks. The neural adaptive controller for a multi-load coupled tracking system under foundation motion excitation is designed to achieve decoupling control of the system. On this basis, a naval gun is set as the verification object. The mechanical–electrical-hydraulic coupling dynamic model of the naval gun and the random foundation motion model of the pedestal are established. The effectiveness of the research method in the paper is verified through the application simulation on the naval gun pointing control problem under the foundation motion excitation of the warship. The research provides technical references for high-precision control of multi-load coupled tracking systems under foundation motion excitations such as naval guns and wave compensation gangways.

关键词： Wave compensation Multi-load coupling Dynamic analysis Neural adaptive control Naval gun

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Synthetic gene circuits moving into the clinic

引用

Quantitative Biology 2021年第1期9卷 100-103页

作者： Shuguang Peng Huiya Huang Ping Wei Zhen Xie MOE Key Laboratory of Bioinformatics and Bioinformatics Division Center for Synthetic and System BiologyDepartment of AutomationBeijing National Research Center for Information Science and TechnologyTsinghua UniversityBeijing 100084China Beijing Syngentech Co. LtdZhongguancun Life Science ParkChangping DistrictBeijing 102206China Center for Gene Circuit and Cell Design Shenzhen Institute of Synthetic BiologyShenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055ChinaCenter for Quantitative BiologyAcademy for Advanced Interdisciplinary StudiesPeking UniversityBeijing 100871China

On November 28th 2020,SyngenTech,a China-based biotechnology company,announced that the company’s leading oncolytic virotherapeutic product,SynOVl.l,was approved for clinical trial by the *** and Drug *** synthetic bacterial or cell therapy[1,2],this is the first introduction of a viral therapy engineered using synthetic gene circuits into the *** with the clinical development of variable living therapeutics,we anticipate that synthetic gene circuits will receive increasing attention as a revolutionary technology to improve disease-treatment efficacy.

关键词： clinic clinical Together

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Corrigendum to "Effects of Sample Length on the Transient Measurement Results of Water Vapor Diffusion Coefficient of Porous Building Materials: A Case Study of Autoclave Aerated Concrete (Aac) with Various Porosities"

SSRN

引用

SSRN 2023年

作者： Tian, Shuai-Qi Fan, Li-Wu Yu, Zi-Tao Ge, Jian Janssen, Hans Institute of Thermal Science and Power Systems School of Energy Engineering Zhejiang University Zhejiang Hangzhou310027 China State Key Laboratory of Clean Energy Utilization Zhejiang University Zhejiang Hangzhou310027 China Institute of Building Technology School of Civil Engineering and Architecture Zhejiang University Hangzhou310058 China KU Leuven Department of Civil Engineering Building Physics and Sustainable Design Leuven3001 Belgium

In this Short Communication, the corrigendum of our former publication in 2019 entitled " Effects of sample length on the transient measurement results of water vapor diffusion coefficient of porous building materials: A case study of autoclave aerated concrete (AAC) with various porosities" is involved. Specially, the conclusion that sample lengths have a crucial effect on the water vapour diffusivities obtained by a dynamic measurement method proposed in 2011 is no longer reliable, given that a recent critique has however shown that that method is defective. This corrigendum first involved a few auxiliary corrections with respect to all water vapour permeabilities and fitting coefficients of sorption isotherm, and then employed the correct approach to re-process the original data in order to establish the correct diffusivities. The updated diffusivity outcomes indeed invalided our former conclusions, indicating little effect of the sample length on the measurement results. Meanwhile, the diffusivities were transformed into permeabilities through the sorption isotherms in order to compare with the steady-steady state based permeabilities. The transient permeabilities were found to have good agreement with each other as well, but were found to be a little bit overestimated as compared with their steady-state counterparts. © 2023, The Authors. All rights reserved.

关键词： Porosity

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Effect of visual environment on auditory perception in the public spaces of shopping malls 49

Effect of visual environment on auditory perception in the p...

引用

49th International Congress and Exposition on Noise Control Engineering, INTER-NOISE 2020

作者： Yi, Fashu Kang, Jian School of Architecture Harbin Institute of Technology Key Laboratory of Cold Region Urban and Rural Human Settlement Environment Science and Technology Ministry of Industry and Information Technology NO. 73 Huanghe Road Nangang District Harbin China UCL Institute for Environmental Design and Engineering Bartlett University College London LondonWC1H0NN United Kingdom

ISBN: (纸本)9788994021362

A laboratory experiment was conducted, in which varies scene composed of typical audio and visual elements in the public spaces of shopping malls. The participants were asked to answer questionnaires about the audio-visual scenes with which they were presented. It was found that the visual environment had little influence on people's evaluation of the auditory environment but had a significant influence on their perception of auditory elements in different types of spaces. When the visual element is consistent with the specific auditory element that conveys the same information, the percentage of correct recognition of the auditory elements decreases. Overall, the results suggest that people perceive the environment as a whole, instead of disassembling the perception into several elements. © Proceedings of 2020 International Congress on Noise Control Engineering, INTER-NOISE 2020. All rights reserved.

关键词： Shopping centers

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Ferromagnetism in 2D vanadium diselenide

arXiv

引用

arXiv 2021年

作者： Wang, Xiong Li, Dian Li, Zejun Wu, Changzheng Chen, Gang Cui, Xiaodong Physics Department University of Hong Kong Hong Kong Hefei National Laboratory for Physical Sciences at the Microscale CAS Center for Excellence in Nanoscience CAS Key Laboratory of Mechanical Behavior and Design of Materials University of Science and Technology of China Hefei China

Two-dimensional (2D) Van der Waals ferromagnets carry the promise of ultimately miniature spintronics and information storage devices.1,2 Among the newly discovered 2D ferromagnets all inherit the magnetic ordering from their bulk ancestors.3-5 Here we report a new 2D ferromagnetic semiconductor at room temperature, 2H phase vanadium diselenide (VSe2) which show ferromagnetic at 2D form only. This unique 2D ferromagnetic semiconductor manifests an enhanced magnetic ordering owing to structural anisotropy at 2D limit. Copyright © 2021, The Authors. All rights reserved.

关键词： Ferromagnetism

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Nanomaterials for Biomedical Applications: Addressing Regulatory Hurdles and Strategic Solutions

Nano Trends

引用

Nano Trends 2025年

作者： Sunil Gujjar Samiksha Kukal Prakash Jayabal Neha Balaji Saloni Sainger Srabaita Roy Suneel Rallapalli Ravikiran Mahadevappa Shilpi Minocha Saran Kumar Santosh Mathapati Biomaterials Laboratory BRIC-Translational Health Science and Technology Institute Faridabad 121001 Haryana India Kusuma School of Biological Sciences Indian Institute of Technology Delhi Hauz Khas New Delhi 110016 India Department Of Engineering Design Indian Institute of Technology Madras Chennai 600 036 India Department of Biotechnology Gandhi Institute of Technology and Management (GITAM) Deemed to be University Bengaluru 562163 India

Nanotechnology has revolutionized modern healthcare by providing innovative solutions for the diagnosis, treatment, and monitoring of various medical conditions. The unique biological, chemical, and mechanical attributes of nanomaterials have favoured their use for various medical applications, including drug delivery, tissue engineering, implantable devices, bio-molecular detection, and diagnostics. However, potential risks associated with nanomaterial usage on health and environment raised concerns regarding their safety and regulatory oversight. Focusing exclusively on nanomaterial design with less attention towards nano-bio interaction has become a significant bottleneck to their clinical translation. This review aims to provide a concise overview of the characteristics of nanomaterials which find exciting applications in biological and biomedical fields. More importantly, we put forth the current regulation status of these advanced materials, highlighting the potential challenges and uncertainties in the regulatory assessment, and discussing potential strategies for effective regulation. A robust regulatory framework will allow a smooth clinical translation of such materials without compromising patient safety.

关键词： Nanomaterials Clinical Applications Nanotoxicity Regulatory Challenges Regulatory Strategies

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