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Your search keyword '"Zhou Xinyu"' showing total 1,140 results
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1,140 results on '"Zhou Xinyu"'

1. Research on Online Energy Group Condensation Method for Fine Group Energy Spectrum

Author

ZHOU Xinyu, RAO Junjie, ZHANG Hongbo, ZHAO Chen, ZHAO Wenbo, WANG Lianjie, CHEN Zhang

Subjects
fine group energy spectrum, online energy group condensation, deterministic one-step method, efficiency optimization, shark, Nuclear engineering. Atomic power, TK9001-9401, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Because the elastic scattering cross sections of medium-mass nuclides have very strong elastic scattering resonance phenomenon in the fast neutron region, which will lead to the self-shielding effect of energy scale and make distortions of the neutron flux distribution to zigzagging. In order to accurately describe the distribution of neutron flux in the energy scale, the deterministic one-step method needs to divide a large number of energy intervals for description, and the number of energy groups is generally thousands. Deterministic one-step transport calculation has large memory and low computational efficiency with thousands of groups. In the traditional calculation of the whole-core non-uniform transport calculation for the thousands of groups, the section generation software was mainly used to prepare the self-shielding cross section by using the ultra-fine groups, and then the broad-group cross section was prepared offline by the transport calculation of the equivalent model of cells or components. Finally, the deterministic one-step program was used to calculate the whole-core non-uniform transport. The broad-group cross sections prepared off-line cannot reflect the characteristics of materials of different reactor locations and bring the approximations. In order to solve the problem that the thousand-group energy structure of fast reactors leads to the high computational cost of the deterministic one-step method, an online energy group condensation method with fine group energy spectrum based on SHARK was developed. For the fuel cells of fast reactors, it can keep the composition of fuel and other materials unchanged and search the radius of the fuel to make the escape cross section conserved. It has the capability of online equivalent model establishment, online calculation of fine group energy spectrum and broad group cross sections condensation. For non-fuel cells, the broad group cross section was condensed using the fine group energy spectrum calculated by the one-dimensionalal constant volume model of practical problems. Based on the MOX1000 material of the benchmark for neutronic analysis of sodium-cooled fast reactor cores, a two-dimensional 5×5 rectangular single-assembly problem and a two-dimensional 3×3 multi-assembly problem were constructed and calculated. The numerical results show that compared with the calculation results of the group in 1 968, the acceleration ratio of the online energy group condensation method in the two-dimensional 5×5 rectangular single-assembly problem is 8 to 18 and that in the two-dimensional 3×3 multi-assembly problem is 12 to 17, which can significantly improve the calculation efficiency. In terms of calculation accuracy, the relative deviation of pin power distribution is less than 1%, and the maximum deviation of eigenvalue is about 360 pcm. It is of great significance to deterministic one-step method for fast reactor transport calculation.

Published
2024
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2. New Green’s Function Method for Solving Underground Oil Seepage Problems

Author

Li Linkai, Kang Hao, Gong Wangting, Zhou Xinyu, Fang Pengwei, Wang Zaizhou, Zhang Chunxiang, and Qu Yongjie

Subjects
point source function, transient flow, dirac function, green’s function, spherical flow, 46n40, Mathematics, QA1-939
Abstract

Compared with the variables separation method and integral-transform method, Green’s function method is much more applicable and thus of great practical significance. Based on the general steps of Green’s function method, a new method is originally raised to get Green’s function in oil and gas flow problems through underground formations. After that, the transient pressure solution is get for flow in a spherical reservoir by using this method. This case enlarged the application of Greenʼs method function, and this work can also be a good foundation for the solution of more and more complicated flow problems in oil and gas reservoirs.

Published
2023
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8. Correction: A Randomized, Double-Blind, Positive-Controlled, Multicenter Clinical Trial on the Efficacy and Safety of ShuganJieyu Capsule and St. John’s Wort for Major Depressive Disorder with Somatic Complaints

Author

Xiang, Yajie, Wang, Lihua, Gu, Ping, Wang, Chunxue, Tian, Yuling, Shi, Wanying, Deng, Fang, Zhang, Yongbo, Gao, Li, Wang, Kai, Wang, Yi, He, Jincai, Zhao, Wenfeng, Bi, Xiaoying, Hu, Jian, Zhong, Lianmei, Guo, Yi, Zhou, Xinyu, Wang, Hongxing, and Xie, Peng

Published
2024
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35. A Randomized, Double-Blind, Positive-Controlled, Multicenter Clinical Trial on the Efficacy and Safety of ShuganJieyu Capsule and St. John’s Wort for Major Depressive Disorder with Somatic Complaints

Author

Xiang, Yajie, Wang, Lihua, Gu, Ping, Wang, Chunxue, Tian, Yuling, Shi, Wanying, Deng, Fang, Zhang, Yongbo, Gao, Li, Wang, Kai, Wang, Yi, He, Jincai, Zhao, Wenfeng, Bi, Xiaoying, Hu, Jian, Zhong, Lianmei, Guo, Yi, Zhou, Xinyu, Wang, Hongxing, and Xie, Peng

Published
2023
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38. Motivation, Self-Efficacy, Perception, Curiosity, and Barriers toward Medical Research among Undergraduates in China

Author

Chen, Huiyu, Teng, Teng, Chen, Hongyu, Liu, Xiaoying, Liu, Zhaohong, Li, Xuemei, Jie, Wang, Wu, Xiang, Cao, Lu, Hongyan, Wu, Zhu, Dan, and Zhou, Xinyu

Abstract

Medical research is important to scientific progress and medical education. Institutions worldwide have sought to increase student involvement in research such as clinician-scientists training programs, while little is known about how medical undergraduates perceive research. A cross-sectional study was conducted in Chongqing Medical University, Chongqing, China, with first--fourth year undergraduates. An online, anonymous, and self-rating 5-point Likert questionnaire was conducted to investigate medical undergraduates' demographic characteristics and assess motivation, self-efficacy, perception, curiosity, and barriers regarding medical research. Content validity was checked with experts and face validity was checked for clarity and understanding of the questionnaire. The Cronbach's alpha coefficient of the questions ranged from 0.813 to 0.879. A total of 3273 medical undergraduates were surveyed, and 86.62% (2835) participants (male 962, female 1873) were identified as effective. Males scored higher than females on self-efficacy (p < 0.001), perception (p = 0.017), and curiosity (p < 0.001), and lower on barriers (p < 0.001). The second year students are at the peak of their perception (p = 0.006) and lowest barrier scores (p = 0.003). Students with scientific research experience scored higher in motivation (p = 0.002), self-efficacy (p < 0.001), perception (p < 0.001), and curiosity (p < 0.001). Lack of proper mentoring opportunity (86.2%) and knowledge (84.5%) were the main barriers in conducting research. Even though they have a positive perspective, only a few undergraduates enrolled in research. Medical universities should encourage faculties to supervise and guide undergraduates' projects, and provide feasible solutions for students to learn scientific knowledge and skills. It is vital to build a research-oriented environment and academic atmosphere.

Published
2023
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