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30th International Conference on Nuclear Engineering, ICONE 2023

作者： Zhou, Ziling Wang, Yu Guo, Jingni Xie, Feng Wen, Yanwei Shan, Bin Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University Beijing100084 China School of Materials Science and Engineering Huazhong University of Science & Technology Wuhan430074 China

ISBN: (纸本)9784888982566

Tritium is one of the most concerned nuclides in nuclear power plants because of its high mobility and circulation in the environment. The high-temperature gas-cooled reactor pebble-bed module (HTR-PM) constructed in Rongcheng City, Shandong Province, China, is the first stage of the very high-temperature gas-cooled reactor (VHTR), which has been identified as one of the six Generation IV nuclear energy systems by Generation IV International Forum (GIF). Since it can diffuse from the primary loop to the secondary loop through heat exchanger tube, the control of tritium is significant for the high temperature thermal application of high-temperature gas-cooled reactors (HTGRs). Graphite is regarded as tritium sink to decrease the tritium activity in the primary loop due to its strong adsorption capability. Some researches on interaction between tritium and graphite indicate that tritium distributes mainly on the graphite surface layer, while in the interior the specific activity of tritium is almost constant. After oxidation, graphite can trap more tritium. However, the ratio of tritium in the surface to bulk decreased because of more tritium access from graphite surface to the bulk. In this paper, first-principles density functional theory was implemented to study the effect of oxidation on tritium adsorption at the graphite zigzag edge. The adsorption energy of oxygen and tritium at the zigzag edge of single graphene sheet was calculated. The influence of adsorbed oxygen on tritium adsorption was investigated. The electronic structure and charge density were presented to illustrate the bonding properties between zigzag edge carbon, oxygen, and tritium. Current study can provide a preliminary investigation on the mechanism of oxidation effect on tritium adsorption at graphite zigzag edge from an atomic scale. © 2023 by JSME.

关键词： Graphite

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NUMERICAL STUDY OF HEAT TRANSFER ENHANCEMENT IN NARROW RECTANGULAR CHANNEL WITH ROTATED ELLIPTIC DIMPLE WITH INCLINED SLIT 29

NUMERICAL STUDY OF HEAT TRANSFER ENHANCEMENT IN NARROW RECTA...

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2022 29th International Conference on Nuclear Engineering, ICONE 2022

作者： Wang, Chuntao Lu, Qi Qiu, Xiang Liu, Yu Deng, Jian Sun, Jie School of Chemical Engineering and Technology Xi'an Jiaotong University Xi'an China Key Laboratory of Nuclear Reactor System Design Technology Nuclear Power Institute of China Chengdu China

ISBN: (纸本)9780791886434

In order to enhance heat transfer performance of the reactor core coolant in the narrow rectangular channel of nuclear power system and ensure the safety of the reactor core without local high temperature as well as not cause excessive pressure loss, three different shapes of protruded elliptic dimple were adopted in the channel for numerical research. Firstly, the angle between long axis of the elliptic dimple and direction of the mainstream was rotated, which was defined as a rotated angle θ ranging from 0° to 90°. Secondly, streamwise (in line with the mainstream) slit was processed on the dimple. The last, inclined slit was processed on the dimple. There were five quantitative and two qualitative indicators to account for comprehensive effects of heat transfer, flow resistance and temperature distribution on the wall of the channel, namely, Nu for heat transfer capacity, f for flow resistance, performance evaluation criteria PEC for combination of heat transfer and flow resistance, T max and Tavg for maximum and average temperature on the outer wall respectively, velocity field near the inner wall and temperature distribution on the outer wall to show more detail information of the flow and heat transfer characteristics. The study results showed that with increase of θ, heat transfer efficiency and flow resistance all increased. Dimple with whether streamwise slit or inclined slit helped to reduce flow resistance. The dimple with streamwise slit performed best in flow resistance performance and the dimple with inclined slit performed best in heat transfer performance. Copyright © 2022 by ASME.

关键词： Temperature distribution

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PyEBSDIndex: Indexing Electron Backscattered Diffraction Patterns on the GPU

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Microscopy and microanalysis : the official journal of Microscopy Society of America, Microbeam Analysis Society, Microscopical Society of Canada 2023年第1期29卷 475-476页

作者： Rowenhorst, David J. Callahan, Patrick Wiik Ånes, Håkon Metallurgical Alloy Design Section US Naval Research Laboratory WA United States Department of Materials Science and Engineering Norwegian University of Science and Technology Trondheim Norway

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Developing and designing a smart cladding for UK existing building envelopes to improve thermal performance

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International Journal of Energy and Water Resources 2024年第3期8卷 427-435页

作者： Sabery, S.M. Sanaieian, H. Bartlett School of Architecture University College London (UCL) London United Kingdom Building and Environment Research Laboratory School of Architecture and Environmental Design Iran University of Science and Technology Tehran Iran

The design of a building’s envelope can considerably affect the building’s energy performance. However, finding the best building envelope parameters to achieve the optimal design in respect to the energy performance is a complicated task. Therefore, some different methods have been developed to optimize building envelope parameters to achieve better thermal behaviour and energy consumption. Many types of smart claddings and kinetics have been developed, but their details remain unclear and unstructured. The smart cladding discussed in this work is defined as an integrated sustainable tool to control energy consumption regarding comfort parameters. These parameters directly affect the occupant’s behaviour, and considering these parameters helps to achieve better practical results. This paper aims to design a control system process and its supporting theory, to develop a model of smart cladding. In order to clarify the theory (methodology), related calculations are provided based on formulations. The obtained data was validated by the carrier hourly analysis program (HAP) v4.90. During the design of the mentioned control system, effective parameters are investigated;such as glazing ratio, visual comfort and the effect of dwelling occupation on heat transfer. The research took into account both full-time and part-time employment as two separate time periods during the day. The energy consumption was evaluated regarding different parameters, such as visual comfort and occupation period;and the results show a heat transfer reduction of approximately half. Consequently, the smart cladding’s design increased energy savings by 45%. © The Author(s), under exclusive licence to Iranian Society of Environmentalists (IRSEN) and science and Research Branch, Islamic Azad University 2023.

关键词： Comfort Envelope Heat transfer Optimization Smart cladding

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A Concise Formula for Backscattering Prediction of Truncated Wedge Model 22

A Concise Formula for Backscattering Prediction of Truncated...

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22nd IEEE International Conference on Communication technology, ICCT 2022

作者： Yao, Gengjiang Chen, Lijie Xiao, Long He, Fan Hu, Xiao Cao, Zhaowang China Ship Development and Design Center China Science and Technology on Electromagnetic Compatibility Laboratory Huazhong University of Science and Technology Wuhan China

ISBN: (纸本)9781665470674

In this paper, a concise monostatic radar cross section (RCS) expression of truncated wedge model is obtained by geometric diffraction theory (GTD). The truncated wedge model consists of two flat plates with a certain angle. The monostatic RCS expression of truncated wedge model is derived and simplified by analyzing the monostatic RCS of the flat plate. The calculated results are in good agreement with the simulation results obtained by the commercial software CST STUDIO SUITE, which verifies the accuracy of the proposed expression. The obtained concise expressions require fewer computational resources and are useful for analysis of scattering characteristic. © 2022 IEEE.

关键词： Backscattering

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Effect of Fission Defects on Tensile Strength of U3si2 Σ5(210) Grain Boundary from First-Principles Calculations

SSRN

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SSRN 2023年

作者： Zhao, Jiajun Sun, Dan Xi, Liu Chen, Ping Zhao, Jijun Wang, Yuanyuan Dalian University of Technology Liaoning Dalian China Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Sichuan Chengdu China

U3Si2 is regarded as a promising accident tolerant fuel (ATF) to replace the commercial fuel UO2;however, U3Si2 grain boundary (GB) embrittlement caused by irradiation-induced defect segregation remains to be clarified. In this work, U3Si2 Σ5(210) symmetrically tilt GB is taken as representative to elucidate the individual effect of xenon (Xe) and vacancy on the tensile strength and failure of GB using first-principles calculations. Compared with the predicted segregation energies of defects at the most energetically favourable positions of GB, Si vacancy (VSi) has much stronger preference to segregate to GB than that of Xe substitution on Si sublattice (XeSi). Moreover, the strengthening/embrittlement potency of GB with single vacancy/Xe is evaluated using the first-principles-based uniaxial tensile test. Although both VSi and XeSi yield a weakening effect on the strength of U3Si2 Σ5(210) GB, such defective GBs exhibit significantly stronger interface strengths compared to the corresponding defects segregated to UO2 Σ3(111) GB. The underlying mechanism of strength change of U3Si2 GB is discussed in terms of charge analysis. Our results can provide fundamental understanding on the mechanical behavior of irradiated GB from an atomic perspective. © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

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Modulator-directed assembly of hybrid composites based on metalorganic frameworks and upconversion nanoparticles

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Nano Research 2023年第1期16卷 1482-1490页

作者： Yanhui Feng Xingjun Li Shan Lu Renfu Li Zhongliang Gong Xiaoying Shang Yifan Pei Wei Zheng Datao Tu Xueyuan Chen CAS Key Laboratory of Design and Assembly of Functional Nanostructures Fujian Key Laboratory of Nanomaterialsand State Key Laboratory of Structural ChemistryFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China College of chemistry Fuzhou universityFuzhou 350108China Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou 350108China College of Chemistry and Materials Science Fujian Normal UniversityFuzhou 350117China

Hybrid composites made of metal-organic frameworks(MOFs)and lanthanide-doped upconversion nanoparticles(UCNPs)have attracted considerable interest for their synergistically enhanced functions in various applications such as chemical sensing,photocatalysis,anticounterfeiting and ***,precise assembly of MOF/UCNP hybrid composites with tunable morphologies remains a challenge due to the lack of effective synthetic methods and fundamental understanding of the growth ***,we propose a modulator-directed assembly strategy to synthesize a series of ZIF-8@UCNP composites(ZIF-8=zeolitic imidazolate framework-8).The UCNPs densely paved on the surface of ZIF-8 microcrystals and endowed the composites with intense upconversion blue emission,which were verified by steady-state/transient photoluminescence(PL)spectroscopy and single-particle ***(EDA)was firstly used as a modulator to fine-tune the predominant MOF facets and realized distinct morphologies of the *** adjusting the concentration of EDA from 0 to 25 mmol/L,the morphology of the ZIF-8@UCNP composites was tuned from rhombic dodecahedron(RD)to truncated rhombic dodecahedron(TRD),cube with truncated edges(CTE),cube,and finally a unique form of interpenetration twins(IT).The nucleation and growth process of the ZIF-8@UCNP composites was monitored by time-dependent scanning electron microscopy(SEM)images and the formation mechanism was thoroughly ***,we demonstrated that the strategy for assembly of morphology-controllable ZIF-8@UCNP composites was generally applicable to various UCNPs with different sizes and *** proposed strategy is expected to open up new avenues for the controllable synthesis of MOF/UCNP composites toward diverse applications.

关键词： metal-organic frameworks upconversion nanoparticles hybrid composites ethylenediamine modulator

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design and Investigation of Frequency Selective Surface Loaded Thermoplastic Polyurethane Polymer-Based 5G Absorber

Design and Investigation of Frequency Selective Surface Load...

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2023 IEEE International Conference on Electrical, Electronics, Communication and Computers, ELEXCOM 2023

作者： Agrawal, Anjali Kumar, Anil Panwar, Ravi Indian Institute of Information Technology Design & Manufacturing Department of Electronics and Communication Engineering Jabalpur India School of Materials Science and Technology Indian Institute of Technology Bhu High-Frequency Materials and Structures Laboratory Varanasi India

ISBN: (纸本)9798350305111

In the past few years, numerous efforts have been undertaken towards the development of microwave absorbers that are simple, broadband, angularly stable, lightweight, conformal, and unaffected by polarization effects. This work comprises a single-layer decagonal ring-shaped frequency selective surface (FSS) loaded thermoplastic polyurethane polymer-based absorber for the mm-wave band. The designed absorber with a dielectric substrate having a thickness of only 1.7 mm achieves a -10 dB reflection coefficient (RC) bandwidth of 5.5 GHz (23-28.5 GHz) for the normal angle of incidence. Furthermore, the proposed absorber shows a minimum RC of -28 dB at 26 GHz centre or resonant frequency. Moreover, the surface current distributions at a resonant frequency of the proposed microwave absorber are also investigated. The presented absorber is lightweight, flexible, polarization insensitive, angularly stable, and suitable for 5G applications. © 2023 IEEE.

关键词： Frequency selective surfaces

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Research on the Remaining Useful Life Prediction Model of Complex Equipment

Research on the Remaining Useful Life Prediction Model of Co...

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Artificial Intelligence and Intelligent Manufacturing (AIIM), International Symposium on

作者： Lei Tang Yifei Tang Junhao Zhang Mengjuan Liu Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu China School of Information and Software Engineering University of Electronic Science and Technology of China Chengdu China Glasgow College University of Electronic Science and Technology of China Chengdu China

ISBN: (数字)9798331541729

ISBN: (纸本)9798331541736

With the rapid advancement of artificial intelligence technology, the development of intelligent manufacturing has become an inevitable trend. Utilizing AI technology to ensure the safe operation of factories is a crucial aspect of smart factories. In particular, research focused on fault diagnosis and remaining useful life (RUL) prediction models based on machine learning has garnered significant attention from both academia and industry. This paper explores RUL prediction models for complex equipment, introduces four representative models, and analyzes their performance using two benchmark datasets, C-MAPSS and N-CMAPSS. Finally, the paper discusses the future research and application trends of artificial intelligence technology in complex equipment operation and maintenance.

关键词： Fault diagnosis Training Analytical models Machine learning Predictive models Market research Production facilities Maintenance Monitoring Smart manufacturing

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Ship model self-propulsion instrument development and test verification 8

Ship model self-propulsion instrument development and test v...

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2024 8th International Conference on Hydrodynamics, Energy and Electric Power System, HEEPS 2024

作者： Wu, Yongshun Ma, Qiang Xu, Wenjun Xia, Wenjing Yang, Sujun Marine Design & Research Institute of China Shanghai200011 China Shanghai Key Laboratory of Ship Engineering Shanghai200011 China China Institute of Marine Technology & Economy Beijing100081 China Laboratory of Science and Technology on Water Jet Propulsion Shanghai200011 China

Aimed at the characteristics of high precision requirements and large environmental changes of the thrust and torque coupling test in the self-propulsion test of the ship model, the paper carries out the design of the instrument of the ship model test, the calculation of structural strength, the design of anti-jamming of the thrust and torque coupling, and the selection and realization of thrust and torque module. Based on the above, the instrument was calibrated with sensitivity coefficient, high and low temperature, and dynamic stability tests. Besides this, a self-propulsion test at the design speed point of a ship was carried out to verify the accuracy and environmental adaptability. From the static calibration result, the coefficient of determination is 1.0. The max zero drift of thrust and torque is 0.11% FS and 0.05% FS respectively from the low-high temperature test, and the max zero drift of torque under different revolutions is 0.23% FS from the dynamic test. In addition to the above, the max deviation between Maric-SP01 and R31 of thrust and torque is less than 0.78% and 0.65% respectively from the ship model self-propulsion test. So, in one word, the instrument has good reliability and accuracy and can meet the requirements of the ship model self-propulsion test. © Published under licence by IOP Publishing Ltd.

关键词： Low temperature testing

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