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SSRN 2022年

作者： He, Wenhui Li, Xian-Xiang Zhang, Xiaohu Yin, Tiangang Norford, Leslie K. Yuan, Chao School of Atmospheric Sciences Key Laboratory of Tropical Atmosphere-Ocean System Ministry of Education Sun Yat-sen University Guangdong Zhuhai China Southern Marine Science and Engineering Guangdong Laboratory Zhuhai China Department of Urban Planning and Design The University of Hong Kong Hong Kong Earth System Science Interdisciplinary Center University of Maryland College ParkMD United States Department of Architecture Massachusetts Institute of Technology CambridgeMA United States Center for Environmental Sensing and Modeling Singapore-MIT Alliance for Research and Technology Singapore Department of Architecture National University of Singapore Singapore

Heat released from the energy consumption in buildings (QB) is an important component of anthropogenic heat, which is a major contribution to the urban heat island (UHI) phenomenon. However, it is still a challenge to integrate all the available data to improve the estimation of QB due to inconsistence among multiple data sources. This paper presents a solution to estimate the anthropogenic heat from buildings in Singapore by classifying the buildings into the electricity consumption sectors based on random forest classification model using multiple data sources. The classification model achieves a cross validation accuracy score of 95% by using building use type, land use type of land parcel where the building stands, location and area as predictors. Based on the classification result, the daily average QB from the commercial buildings (CS), Housing and Development Board (HDB) apartments, private apartments and condominiums (AC), and landed properties (LP) were estimated to be 12.1, 4.4, 3.2 and 1.1 W m-2 on a 200 m-by-200 m grid, respectively. QB was approximately 9% of the net all-wave radiation in Singapore in 2015. Our approach can serve as a useful tool for integrating dataset from different sources with inconsistent categorisations. © 2022, The Authors. All rights reserved.

关键词： Energy utilization

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The Investigation of Removal and Mechanism by Different Permeable Paving systems on Runoff Pollutants

SSRN

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SSRN 2024年

作者： Zhang, Ziyang Yang, Ying Li, Zhifei Chen, Hongrui Zhang, Xiaoran Gong, Yongwei Tan, Chaohong Li, Haiyan Key Laboratory of Urban Stormwater System and Water Environment Ministry of Education Beijing University of Civil Engineering and Architecture Beijing102616 China Beijing Energy Conservation & Sustainable Urban and Rural Development Provincial Ministry Co-construction Collaboration Innovation Center Beijing100044 China Beijing General Municipal Engineering Design ＆ Research Institute Co. Ltd Beijing100082 China CRRC Environmental Science & Technology Cooperation Beijing100067 China Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control Beijing University of Civil Engineering and Architecture Beijing100044 China

In order to investigate the runoff pollutant control effects by different types of permeable paving systems (PPS), Porous asphalt (PA), Porous concrete (PC), Cement brick (CTB), Ceramic brick (CCB), Sand base brick (SBB) and Shale brick (SB) were selected. The removal effects and mechanisms of six PPS and individual filler layer on chemical oxygen demand (COD), ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3-N), total nitrogen (TN) and total phosphorus (TP)were investigated. Studies have shown that the removal of runoff pollutants varies widely among different PPS. PA had the best removal effect for nearly all runoff pollutants, which the maximum removal rate was 100% for both COD and NH4+-N. Permeable bricks could effectively control on NO3-N and TN pollutants, which the best removal efficiency were more than 94% for SB. Compared with other runoff pollutants, PC was more effective in removing TP with a removal rate of 95.8%. Furthermore, compared with surface material, base layer, subbase layer and soil layer were the most effective in controlling pollution in runoff, which the removal rate were more than 80%. Due to the deeper length, pollutants in runoff could contact with filler longer time and increased the removal efficiency. At the same time, graded gravel and medium sand have a stronger adsorption capacity for pollutants in runoff, resulting in a better purification. This study provides theoretical and practical significance not only for runoff pollution control, but also for the design and use of PPS in runoff. © 2024, The Authors. All rights reserved.

关键词： Fillers

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Interfacial area correlation for annular flow in vertical pipes 27

Interfacial area correlation for annular flow in vertical pi...

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

作者： Liu, Hang Huang, Haojie Lai, Jianyong Pan, Liangming Li, Yi Zhou, Wenxiong Science and Technology on Reactor System Design Technology Laboratory Nuclear Power Institute of China Chengdu610041 China Nanjing Research Institute of El ectronics Technology Nanjing210000 China Department of Nuclear Engineering Chongqing University Chongqing400044 China

ISBN: (纸本)9784888983051

Interfacial area concentration is one of the most critical parameters in two-phase flow and reflects the interfacial area of mass, momentum and energy transfer. The prediction of interfacial area concentration is also essential to close the interfacial transfer terms in the two-fluid model. The calculation of interfacial area concentration has been well developed from bubbly flow to churn flow, including interfacial area correlations and two-group interfacial area transport equation. While seldom researchers focus on that for annular flow or annular mist flow. This paper proposed the one-dimensional interfacial area correlation for annular flow in vertical pipes based on the averaged liquid film thickness model for annular flow. The effects of the droplets in pipes were also considered in the model. The new model has been evaluated against the existing experimental data. The results indicate that the new model can provide the excellent prediction of the interfacial area concentration for annular flow in vertical pipes. Copyright © 2018-2019 by JSME

关键词： Two phase flow

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Effect of finned structure on critical heat flux (CHF) in downward-face pool boiling 27

Effect of finned structure on critical heat flux (CHF) in do...

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

作者： Wang, Kai Erkan, Nejdet Cai, Rong Okamoto, Koji Department of Nuclear Engineering and Management School of Engineering University of Tokyo Tokyo Japan Science and Technology on Reactor System Design Technology Laboratory Chengdu China Nuclear Professional School School of Engineering University of Tokyo Tokyo Japan

ISBN: (纸本)9784888983051

CHF plays an important role in the heat transfer process during the external reactor vessel cooling (IVR-ERVC) which is deemed as a very effective way to release the decay heat after the core melted. In this paper, the experiment of the macro-fin structure experiment positioned on slope that is declined at angles of 5°and 10°was done. The results of the copper bar experiment were then analyzed and compared with the results obtained from a copper block experiment that had been conducted previously at the same test facility, and it was found that the CHF decreased. Finally, the hot/dry spot theory for the copper bar was brought up in an attempt to explain the difference of copper and copper bar. It seemed that using this theory can explain the decrease of CHF for copper bar. Copyright © 2018-2019 by JSME

关键词： Heat flux

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Secure ISAC MIMO systems: Exploiting Interference With Bayesian Cramér-Rao Bound Optimization

arXiv

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arXiv 2024年

作者： Su, Nanchi Liu, Fan Masouros, Christos Alexandropoulos, George C. Xiong, Yifeng Zhang, Qinyu Shenzhen518055 China The School of System Design and Intelligent Manufacturing Southern University of Science and Technology Shenzhen518055 China The Department of Electronic and Electrical Engineering University College London LondonWC1E 7JE United Kingdom The Department of Informatics and Telecommunications National and Kapodistrian University of Athens Athens15784 Greece The School of Information and Electronic Engineering Beijing University of Posts and Telecommunications Beijing100876 China Shenzhen518055 China Peng Cheng Laboratory Shenzhen518055 China

In this paper, we present a signaling design for secure integrated sensing and communication (ISAC) systems comprising a dual-functional multi-input multi-output (MIMO) base station (BS) that simultaneously communicates with multiple users while detecting targets present in their vicinity, which are regarded as potential eavesdroppers. In particular, assuming that the distribution of each parameter to be estimated is known a priori, we focus on optimizing the targets’ sensing performance. To this end, we derive and minimize the Bayesian Cramér-Rao bound (BCRB), while ensuring certain communication quality of service (QoS) by exploiting constructive interference (CI). The latter scheme enforces that the received signals at the eavesdropping targets fall into the destructive region of the signal constellation, to deteriorate their decoding probability, thus enhancing the ISAC’s system physical-layer security (PLS) capability. To tackle the nonconvexity of the formulated problem, a tailored successive convex approximation method is proposed for its efficient solution. Our extensive numerical results verify the effectiveness of the proposed secure ISAC design showing that the proposed algorithm outperforms block-level precoding techniques. © 2024, CC BY-NC-ND.

关键词： Quality of service

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The study of radiation effect on Raman Distributed optical fiber Temperature Sensor

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Journal of Physics: Conference Series 2021年第1期1780卷

作者： Meiqiong Xiang Yanyang Liu Xianguo Qing Zhengxi He Jialiang Zhu Peng He XinLv Science and Technology on Reactor System Design Technology LaboratoryNuclear Power Institute of China Chengdu610213China

The rapid development of big data and artificial intelligence technology is inseparable from the acquisition of massive basic data, and the data is acquired by sensors. The Raman Distributed optical fiber Temperature Sensor (RDTS) is a kind of sensor with many advantages, such as: anti-electromagnetic interference, intrinsic safety, small size, water and high temperature resistance. It has been applied in many fields for fast and continuous temperaturemeasurement. However, due to the rapid attenuation of transmitted light and the temperature error in radiated environment, it has not been applied innuclear field. Therefore, in order to improve the temperature accuracy of RDTS in radiated environment and provide basic data for advanced control. This paper studies the radiation effect on RDTS. Analyzesthe radiation damage mechanism and radiation damage influencing factors of RDTS. Proposes measures to improve the anti-radiation performance and provides four useful calibration methodsfortemperature error. Among them, two calibration methods have been proved right by experiments.

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Simulation study of an improved mechanical shim control strategy for AP1000 reactor 27

Simulation study of an improved mechanical shim control stra...

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

作者： Jian, Sun Yujia, Huo Junhui, Yu Rui, Zhang Yun, Yu Qi, Huang Science and Technology on Reactor Design Technology Laboratory Nuclear Power Institute of China Chengdu Sichuan China Nuclear Power Institute of China Chengdu Sichuan China

ISBN: (纸本)9784888983051

In this paper, a Mechanical Shim (MSHIM) control system simulation platform for the AP1000 reactor which was said as a Generation III+ pressurized water reactor was developed. Based on this platform, simulation studies for three MSHIM control strategies were performed. It has been demonstrated by the analysis results that the improved MSHIM control strategy purposed in this paper not only can provide much tighter axial offset (AO) control but also can reduce the control rod movement, indicating its superiority than the original MSHIM control strategy. The study can be used as a reference for engineering practices. Copyright © 2018-2019 by JSME

关键词： Pressurized water reactors

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An Approach on Visual Detecting Multi-Targets in the Unstructured and Complex Scenes Based on RGB-D Images 5

An Approach on Visual Detecting Multi-Targets in the Unstruc...

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5th International Conference on Automation, Control and Robotics Engineering, CACRE 2020

作者： Tan, Qimeng Sun, Yikun Xin, Pengfei Lin, Yimin Ma, Chao Wang, Xinyu Beijing Institute of Spacecraft System Engineering Beijing Key Laboratory of Intelligent Space Robotic Systems Technology and Applications Beijing China Beijing Special Engineering Design and Research Institute Propellant Injection Laboratory Beijing China Beijing University of Posts Telecommunications Institute of Optical Communication Optoelectronics Beijing China Beijing Information Science and Technology University School of Instrument Science and Optoelectronic Engineering Beijing China

ISBN: (纸本)9781728198880

The technology of detecting and identifying multitarget is of significance for robotic visual navigation within the unknown, unstructured, complex scenes, whose result could be considered as important references of 3D map building and path planning for mobile robot. Traditional algorithms of target detection can be applied to 2D images without depth information generally, which is disturbed by few factors such as illumination, view and scale easily. Therefore, an approach on visual detecting multi-target of unstructured and complex scenes based on RGBD images is proposed in this article to solve the above problem, which is composed of extracting descriptor of rotation and scale invariance feature, local encoding of targets, random ferns classifier training, Hough map generation, Hough voting theoretical model and local maximum search. Experimental results have shown that the proposed approach reduce the calculation of extracting and matching local feature, improve the accuracy of object recognition and detection in unknown complex environments, be capable of well robust against few disturbing factors i.e. rotation, scale, illumination, occlusion and non-rigid body deformation. © 2020 IEEE.

关键词： Motion planning

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Experimental study on corrugated plate dryer in steam generator under hot working conditions

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iscience 2025年第6期28卷 112581页

作者： Li, Ru Wang, Bo Wang, Gongqing Ye, Xuan Bo, Hanliang Tian, Ruifeng Wei, Xiong Institute of Nuclear and New Energy Technology of Tsinghua University Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Beijing 100084 China College of Nuclear Science and Technology Harbin Engineering University Heilongjiang Harbin 150001 China Wuhan Second Ship Design and Research Institute Hubei Wuhan 430205 China

In advanced pressurized water reactors, the corrugated plate dryer (CPD) is essential for ensuring the safety and efficiency of nuclear power plants by influencing steam quality in the separation system of steam generators. While previous research has focused on cold-condition experiments, this study addresses the complexities of hot operational conditions, which are more representative of real-world scenarios. By investigating the effects of CPD structural parameters on separation performance, the research establishes an experimental platform that reveals a critical plate spacing where the CPD's critical velocity (CV) peaks. Additionally, the study explores the internal gas flow dynamics, demonstrating that increased recirculation along the plate walls significantly impacts flow velocity. These findings contribute to a deeper understanding of CPD performance under realistic conditions, enhancing the reliability and efficiency of nuclear power generation. © 2025 The Authors

关键词： Computational mechanics Heat transfer Mechanical engineering

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Global Dynamics and Optimal design of a New Highly Efficient Nonlinear Energy Sink Based on Magnetic-Elastic Impacts with Negative Stiffness

Research Square

引用

Research Square 2021年

作者： Li, Shuangbao Wang, Tingting Chen, Jianen Research Institute of Science and Technology Innovation Civil Aviation University of China Tianjin300300 China College of Science Civil Aviation University of China Tianjin300300 China Tianjin Key Laboratory for Advanced Mechatronic System Design and Intelligent Control School of Mechanical Engineering Tianjin University of Technology Tianjin300384 China

A new highly efficient elastic-impact bistable nonlinear energy sink (EI-BNES) based on magnetic-elastic impacts with negative stiffness and bistability is proposed and optimized through global dynamical analysis. The EI-BNES has better robustness and higher energy dissipation rates with nearly more than 96.5% for broadband impulsive excitations than the traditional cubic NESs and single bistable NESs. The structure of negative stiffness impacts is realized by reasonable layout of permanent ring magnets and springs. A two-degree-of-freedom (two-DOF) elastic-impact system is established to describe the coupled nonlinear interaction between the main structure and the attached EI-BNES. A global Melnikov reduction analysis (GMRA) is proposed to study global dynamics and homoclinic bifurcations of the reduced two-dimensional subsystem, which is used to explain the mechanism of nonlinear targeted energy transfer (TET) and detect the threshold of impulsive amplitudes of EI-BNES for in-well and compound motions between in-well and cross-well resonance responses. A special type of saddle-center equilibrium points is also found in the non-smooth system of the EI-BNES and can be used to effectively increase the energy dissipation rates. The optimal design criterion of the tuned EI-BNES for better dissipation performance is also first discussed based on the GMRA and numerical techniques for calculating the Melnikov function of the non-smooth systems. The effectiveness of the analytical GMRA is also verified by numerical simulations. © 2021, CC BY.

关键词： Stiffness

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