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Development and application of a multi-physics and multi-scale coupling program for lead-cooled fast reactor

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Nuclear Science and Techniques 2022年第2期33卷 40-52页

作者： Xiao Luo Chi Wang Ze-Ren Zou lian-kai cao Shuai Wang Zhao Chen Hong-Li Chen School of Nuclear Science and Technology University of Science and Technology of ChinaHefei 230026China China Nuclear Power Technology Research Institute Co.Ltd Shenzhen 518000China

In this study,a multi-physics and multi-scale coupling program,Fluent/KMC-sub/NDK,was developed based on the user-defined functions(UDF)of Fluent,in which the KMC-sub-code is a sub-channel thermal-hydraulic code and the NDK code is a neutron diffusion *** coupling program framework adopts the"master-slave"mode,in which Fluent is the master program while NDK and KMC-sub are coupled internally and compiled into the dynamic link library(DLL)as slave *** domain decomposition method was adopted,in which the reactor core was simulated by NDK and KMC-sub,while the rest of the primary loop was simulated using Fluent.A simulation of the reactor shutdown process of M2LFR-1000 was carried out using the coupling program,and the code-to-code verification was performed with ATHLET,demonstrating a good agreement,with absolute deviation was smaller than 0.2%.The results show an obvious thermal stratification phenomenon during the shutdown process,which occurs 10 s after shutdown,and the change in thermal stratification phenomena is also captured by the coupling *** the same time,the change in the neutron flux density distribution of the reactor was also obtained.

关键词： Multi-physics and multi-scale coupling method User-defined functions Dynamic link library Thermal stratification Lead-cooled fast reactor

Experimental study on the dispersion behavior of a microemulsion collector and its mechanism for enhancing low-rank coal flotation

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International Journal of Mining Science and Technology 2023年第7期33卷 893-901页

作者： Fan lian Guosheng Li Yijun cao Baoxun Zhao Guangli Zhu kai Fan School of Chemical Engineering Zhengzhou UniversityZhengzhou 450001China School of Material Science and Engineering Zhengzhou UniversityZhengzhou 450001China

As the poor dispersion of oily collectors and the inferior hydrophobicity of the mineral surface, the lowrank coal has an unsatisfactory flotation performance when using traditional collectors. In this paper, an ionic liquid microemulsion was used as a collector to enhance its floatability. Flotation test results demonstrated the microemulsion collector exhibited a superior collecting ability. A satisfactory separation performance of 78.66% combustible material recovery was obtained with the microemulsion collector consumption of 6 kg/t, which was equivalent to the flotation performance of diesel at a dosage of25 kg/t. The dispersion behavior of the microemulsion collector was investigated using the CryogenicTransmission Electron Microscopy. The interaction mechanism of the microemulsion collector on enhancing the low-rank coal flotation was elucidated through the Zeta potential and contact angle measurements, the Fourier transform infrared spectroscopy and X-ray photoelectron spectroscopy *** microemulsion collector exhibited superior dispersibility, which was dispersed into positively charged oil droplets with an average size of 160.21 nm in the pulp. Furthermore, the nano-oil droplets could be more efficiently adsorbed on the low-rank coal surface through electrostatic attraction, resulting in the improvement of its hydrophobicity. Thus, the microemulsion collector shows great application potential in improving the flotation performance of low-rank coal.

关键词： Microemulsion Dispersion Nano-oil droplets Flotation Interaction mechanisms

Lithiophilic Cu-Li_(2)O matrix on a Cu Collector to Stabilize Lithium Deposition for Lithium Metal Batteries

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Energy & Environmental Materials 2022年第4期5卷 1270-1277页

作者： Zhe Gong Cheng lian Pengfei Wang kai Huang kai Zhu Ke Ye Jun Yan Guiling Wang Dianxue cao Key Laboratory of Superlight Materials and Surface Technology of Ministry of Education College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China State Key Laboratory of Chemical Engineering School of Chemical EngineeringEast China University of Science and TechnologyShanghai 200237China

Lithium metal anode is the most ideal candidate for next-generation energy storage ***,the uncontrolled dendrite growth,infinite volume expansion,and undesired side reactions lead to serious safety issues and hinder their potential ***,a pre-lithiation strategy is proposed to construct a high-lithiophilic Cu-Li_(2)O matrix on commercial Cu *** in situ-generated Li_(2)O promises adequate nucleation sites and strengthens solid electrolyte interphase and lateral lithium ***,the existence of 3D matrix reduces the local current *** synergy effect of Li_(2)O and Cu suppresses the growth of lithium *** a result,Cu-Li_(2)O matrix reveals an enhanced lithium plating/stripping behavior with Coulombic efficiency of 98.46%after 270 *** symmetrical cell assembled by Li-plated electrodes displays a prolonged lifespan of 1400 *** work demonstrates a scalable and effective approach for modified current collectors toward stable Li metal anode.

关键词： Cu-Li_(2)O matrix current collectors Li metal anodes SEI film

Distance-covariance-based tests for heteroscedasticity in nonlinear regressions

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Science China Mathematics 2021年第10期64卷 2327-2356页

作者： kai Xu Mingxiang cao School of Mathematics and Statistics Anhui Normal UniversityWuhu 241002China

In this paper,we propose a new numerical scheme for the coupled Stokes-Darcy model with the Beavers-Joseph-Saffman interface *** use the weak Galerkin method to discretize the Stokes equation and the mixed finite element method to discretize the Darcy equation.A discrete inf-sup condition is proved and the optimal error estimates are also *** experiments validate the theoretical analysis.

关键词： bootstrap distance covariance heteroscedasticity testing nonlinear regression test of independence

FINITE ELEMENT AND DISCONTINUOUS GALERKIN METHOD FOR STOCHASTIC HELMHOLTZ EQUATION IN TWO-AND THREE-DIMENSIONS

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Journal of Computational Mathematics 2008年第5期26卷 702-715页

作者： Yanzhao cao Ran Zhang kai Zhang Department of Mathematics Florida A&M University TaUahassee FL32307 USA Department of Mathematics Jilin University Changchun 130023 China

In this paper, we consider the finite element method and discontinuous Galerkin method for the stochastic Helmholtz equation in R^d （d = 2, 3）. Convergence analysis and error estimates are presented for the numerical solutions. The effects of the noises on the accuracy of the approximations are illustrated. Numerical experiments are carried out to verify our theoretical results.

关键词： Stochastic partial differential equation Finite element method Discontinuous Galerkin method Stochastic Helmholtz equation.

Class conditional distribution alignment for domain adaptation

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Control Theory and Technology 2020年第1期18卷 72-80页

作者： kai cao Zhipeng TU Yang MING Key Lab of Systems and Control Academy of Mathematics and Systems ScienceChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100190China

In this paper,we study the problem of domain adaptation,which is a crucial ingredient in transfer learning with two domains,that is,the source domain with labeled data and the target domain with none or few *** adaptation aims to extract knowledge from the source domain to improve the performance of the learning task in the target domain.A popular approach to handle this problem is via adversarial training,which is explained by the H△H-distance ***,traditional adversarial network architectures just align the marginal feature distribution in the feature *** alignment of class condition distribution is not ***,we proposed a novel method based on pseudo labels and the cluster assumption to avoid the incorrect class alignment in the feature *** experiments demonstrate that our framework improves the accuracy on typical transfer learning tasks.

关键词： Domain adaptation distribution alignment feature cluster

Learning implicit information in Bayesian games with knowledge transfer

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Control Theory and Technology 2020年第3期18卷 315-323页

作者： Guanpu CHEN kai cao Yiguang HONG Academy of Mathematics and Systems Science Chinese Academy of SciencesBeijing 100190China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

In this paper,we consider to learn the inherent probability distribution of types via knowledge transfer in a two-player repeated Bayesian game,which is a basic model in network *** the Bayesian game,the attacker's distribution of types is unknown by the defender and the defender aims to reconstruct the distribution with historical *** is dificult to calculate the distribution of types directly since the distribution is coupled with a prediction function of the attacker in the game ***,we seek help from an interrelated complete-information game,based on the idea of transfer *** provide two different methods to estimate the prediction function in difftrent concrete conditions with knowledge *** obtaining the estimated prediction function,the deiender can decouple the inherent distribution and the prediction function in the Bayesian game,and moreover,reconstruct the distribution of the attacker's ***,we give numerical examples to illustrate the effectiveness of our methods.

关键词： Bayesian game repeated game knowledge transfer security

Simulation-based study of wind-wave interactions under various sea conditions

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Journal of Hydrodynamics 2019年第6期31卷 1148-1152页

作者： Xuanting Hao Tianyi Li Tao cao lian Shen Department of Mechanical Engineering and Saint Anthony Falls Laboratory University of MinnesotaMinneapolisMinnesotaUSA

Despite their importance in the ocean environment,the key physical processes in wind-wave interactions are poorly *** a solver developed for undulatory boundaries,we perform numerical simulations of the wind-wave system under various sea conditions,including wind over monochromatic waves,early wind-wave generation,and wind over a broadband wave *** results show that the wave direction and wave age can significantly change the distribution of streamwise vorticity in the wind *** wave patterns are observed in the process of wind-wave *** a broadband wave field,the wave growth rate due to wind input is found to depend on the wave steepness.

关键词： Wind-wave interaction direct numerical simulation large eddy simulation phase-resolved wave simulation

A robust QRS detection and accurate R-peak identification algorithm for wearable ECG sensors

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Science China(Information Sciences) 2021年第8期64卷 213-229页

作者： kai ZHAO Yongfu LI Guoxing WANG Yu PU Yong lian Department of Micro and Nano Electronics Shanghai Jiao Tong University Alibaba Group

This paper presents a robust QRS detection algorithm that is capable of detecting QRS complexes as well as accurately identifying R-peaks. The proposed bilateral threshold scheme combined with QRS watchdog greatly improves the detection accuracy and robustness, resulting in consistent detection performance on 9 available ECG databases. Simulations show that the proposed algorithm achieves good results on the datasets from both QTDB healthy database and MITDB arrhythmia database, i.e. the sensitivity of99.99% and 99.88%, the precision of 99.98% and 99.88%, and the detection error rate of 0.04% and 0.31%,respectively. Furthermore, it also outperforms many existing algorithms on six other ECG databases, such as NSTDB, TWADB, STDB, SVDB, AFTDB, and FANTASIADB.

关键词： signal processing QRS detection R-peak detection wearable ECG sensors bilateral threshold