期刊:
Journal of Biological Dynamics,2022年16(1):354-372 ISSN:1751-3758
通讯作者:
Zhu, X.
作者机构:
[Zhu, Xiaoxiao; Ouyang, Zigen; Wang, Huilan] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.
通讯机构:
[Xiaoxiao Zhu; Huilan Wang; Zigen Ouyang] S;School of Mathematics and Physics, University of South China, Hengyang, People's Republic of China<&wdkj&>School of Mathematics and Physics, University of South China, Hengyang, People's Republic of China<&wdkj&>School of Mathematics and Physics, University of South China, Hengyang, People's Republic of China
关键词:
34A37;34C25;37N25;Poincaré map;State-dependent impulse;order-1 periodic solution;predator–prey model;successor function
作者机构:
[Pang, Min; Chen, Xue-Kun; Liu, Jun; Tan, Jia-Ling] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Xie, Zhong-Xiang] Hunan Inst Technol, Dept Math & Phys, Hengyang 421002, Peoples R China.;[Zhou, Wu-Xing] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China.;[Zhou, Wu-Xing] Hunan Univ Sci & Technol, Hunan Prov Key Lab Adv Mat New Energy Storage & Co, Xiangtan 411201, Peoples R China.
通讯机构:
[Xie, Z.-X.] D;[Zhou, W.-X.; Liu, J.] S;School of Mathematics and Physics, China;Department of Mathematics and Physics, China;School of Materials Science and Engineering, China
期刊:
Journal of Radioanalytical and Nuclear Chemistry,2022年331(10):4179-4188 ISSN:0236-5731
通讯作者:
Zhenghua Xu
作者机构:
[Chen, Yifan; Lin, Dongyin; Dai, Xingwang; Chen, Yan] Univ South China, Sch Resource Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Yifan; Lin, Dongyin; Dai, Xingwang; Xu, Zhenghua; Liu, Yong; Chen, Yan] Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Hunan, Peoples R China.;[Liu, Yong] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518060, Guangdong, Peoples R China.;[Xu, Zhenghua] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Zhenghua Xu] H;Hunan Province Engineering Technology Research Centre of Uranium Tailings Treatment Technology, Hengyang, China<&wdkj&>School of Mathematics and Physics, University of South China, Hengyang, China
摘要:
Acceleration, displacement, stress response, and other dynamic response topics are currently the key topics of research. Because uranium tailings reservoirs are radioactive, earthquakes can also cause radon to be released. In order to monitor the acceleration response, displacement (both surface and interior), and radon exhalation rate of the dam body of the uranium tailings reservoir under various seismic peak accelerations, the shaker model test is used. When the peak acceleration is 0.7 g, the displacement swings even more visibly, and when the peak acceleration is 1.0 g, the surface of the dam shows clear fissures. However, the radon response will be quicker and stronger, and as the acceleration of the seismic peak keeps rising, the response gets stronger and stronger. As a result, the dynamic reaction can also be determined from the radon response. The findings of the tests can be used as a guide for the safe and stable operation of uranium tailings reservoirs.
期刊:
Journal of Radiation Research and Applied Sciences,2022年15(1):21-31 ISSN:1687-8507
通讯作者:
Chen, Yifan;Liu, Y
作者机构:
[Lin, Dongying; Chen, Yifan; Dai, Xingwang; Liu, Yong; Chen, YF; Xie, Jiali] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Liu, Yong] Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.;[Liu, Yong; Xie, Jiali] Hunan Prov Engn Res Ctr Radioact Control Technol, Hengyang 421001, Peoples R China.;[Lin, Dongying; Chen, Yifan; Dai, Xingwang] Univ South China, Sinosteel Maanshan Inst Min Res PostgraduateTrain, Hengyang 421001, Hunan, Peoples R China.;[Wu, Xianwei] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
通讯机构:
[Liu, Y ; Chen, YF] U;Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.
关键词:
Analytic hierarchy process;Cloud model;Uranium tailings impoundment dam security
摘要:
To solve the problem of safety and stability of the uranium tailings impoundment dam, based on the whole process of emergency management, the safety and stability evaluation system of the uranium tailings impoundment dam is established by using analytic hierarchy process (AHP) from the four aspects of design and construction, natural environment, operational stability and management, and the general weight of each evaluation index is calculated; the improved AHP-cloud model is introduced to obtain the basic evaluation cloud map for the safety and stability of the uranium tailing dam and two typical dams were evaluated in a large uranium tailings impoundment in southern China. The results show that the model can produce a more accurate evaluation of the safety and stability of the uranium tailings impoundment dam, and provide a reference for the subsequent decommissioning management work.
期刊:
EUROPEAN PHYSICAL JOURNAL A,2022年58(9):1-19 ISSN:1434-6001
通讯作者:
Xiao-Hua Li
作者机构:
[Zhu, De-Xing; Li, Xiao-Hua; Xu, Yang-Yang; Chen, Xun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[He, Biao] Cent South Univ, Coll Phys & Elect, Changsha 410083, Peoples R China.;[Li, Xiao-Hua] Univ South China, Natl Exemplary Base Int Sci & Tech Collaborat Nuc, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.
通讯机构:
[Xiao-Hua Li] S;School of Nuclear Science and Technology, University of South China, Hengyang, People’s Republic of China<&wdkj&>National Exemplary Base for International Sci and Tech. Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang, People’s Republic of China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang, People’s Republic of China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha, People’s Republic of China
摘要:
Based on the Hatsukawa formula (Hatsukawa et al. in Phys Rev C 42:674, 1990), modifying the coefficient F(Z) and considering the blocking effect of unpaired nucleons, in our previous work (Xu and Liu in Eur Phys J A 58:16, 2022) we proposed an improved semi-empirical formula for evaluating the favored
$$\alpha $$
decay half-lives. In this work, considering the contribution of centrifugal potential, we generalize this formula to unfavored
$$\alpha $$
decay and propose a unified formula for
$$\alpha $$
decay half-lives. Using this formula, we systematically calculate the unfavored
$$\alpha $$
decay half-lives of 130 odd-A and 78 odd–odd nuclei with the corresponding root-mean-square (rms) deviations being 0.503 and 0.603, respectively. Meanwhile the rms deviation of
$$\alpha $$
decay half-lives for all the 700 nuclei taken from NUBASE2020 is only 0.380. Moreover, we extend this formula to predict the
$$\alpha $$
decay half-lives of 144 even–even, odd-A and odd–odd nuclei with Z = 117, 118, 119 and 120. For comparison, the unitary Royer formula (DZR) (Deng et al. in Phys Rev C 101:034307, 2020) proposed by Deng et al. and the modified universal decay law (MUDL) (Soylu and Qi in Nucl Phys A 1013:122221, 2021) proposed by Soylu et al. are also used. The predictions of these formulas are basically consistent with each other.
作者机构:
[Cheng, Jun-Hao; Li, Xiao-Hua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zhang, Zhen] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Peoples R China.;[Wu, Xi-Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chu, Peng-Cheng] Qingdao Technol Univ, Sch Sci, Qingdao 266000, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.
关键词:
proton radioactivity;Skyrme;Hartree-Fock;macroscopic quantities of nuclear matter
摘要:
In this study, we systematically investigate the proton radioactivity half-lives of 33 spherical nuclei based on the relationship between Skyrme parameters and the macroscopic quantities of nuclear matter. Using the two-potential approach with the spherical Skyrme-Hartree-Fock model, the correlation between proton radioactivity half-life and the macroscopic quantities is analyzed. Moreover, we obtain a new Skyrme parameter set by fitting the two most weighted macroscopic quantities. Compared with the Skyrme parameters MSL0 and the theoretical model of proton radioactivity UDLP, the theoretical proton radioactivity half-life calculated using the new Skyrme parameter set can better reproduce the experimental data.
摘要:
We consider a one-dimensional classical Poisson-Nernst-Planck model with two ion species, one positively charged and one negatively charged, and a simple profile of nonzero permanent charges. Of particular interest is to examine the effect from boundary layers on zero-current ionic flows in terms of reversal potentials and reversal permanent charges through membrane channels. This is important because boundary layers of charge are particularly likely to create artifacts over long distances, and this could dramatically affect the behavior of ionic flows. With boundary layers, the existence of reversal potentials and reversal permanent charges is established. Particularly, the reversal potentials are further compared with those identified under electroneutrality boundary conditions, and their orders are provided, which sensitively depends on the complicated nonlinear interaction among system parameters, particularly, boundary layers, boundary concentrations and channel geometry.
期刊:
Journal of Alloys and Compounds,2022年918:165408 ISSN:0925-8388
通讯作者:
Xueping Gan<&wdkj&>Xijun Wu
作者机构:
[Wu, Xijun; Cheng, Jinjuan] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Gan, Xueping; Zhang, Ziyan; Gao, Yi; Lei, Qian] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China.
通讯机构:
[Xueping Gan; Xijun Wu] S;State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China<&wdkj&>School of Mathematics and Physics, University of South China, Hengyang 421001, China
摘要:
The effects of yttrium on the cellular precipitation kinetics, grain growth behavior and mechanical properties of Cu-15Ni-8Sn alloy are investigated. Results show that the added yttrium leads to the formation of NiSnY and Ni2Y compounds, which increases the strength, refines the grains and slows the grain growth rate of the Cu-15Ni-8Sn alloy. Also, the addition of yttrium changes the nucleation rate and crystal growth type of the gamma phase, postponing cellular precipitation in the early stages of aging treatment. Compared with the peak-aged Cu-15Ni-8Sn alloy, the peak-aged Cu-15Ni-8Sn-0.2Y alloy possesses higher hardness and strength. The hardness increases from 348 HV to 372.2 HV, the yield strength increases from 960 MPa to 1098 MPa, and the ultimate tensile strength increases from 1044 MPa to 1166 MPa. (C) 2022 Published by Elsevier B.V.
作者机构:
[Lin, Wenbin; Jiang, Chunhua; Yang, Bo; Lin, WB] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Lin, Wenbin] Southwest Jiaotong Univ, Sch Phys Sci & Technol, Chengdu 610031, Peoples R China.
通讯机构:
[Lin, WB ] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
摘要:
We derive the second post-Newtonian solution for the quasi-Keplerian motion of a charged test particle in the Reissner-Nordström spacetime under harmonic coordinates. We formulate the solution in terms of the test particle’s orbital energy and angular momentum, both of which are constants at the second post-Newtonian order. The charge effects on the test particle’s motion including the orbital period and perihelion precession are displayed explicitly. Our results can be applied to the cases in which the test particle has small charge-to-mass ratio, or the test particle has arbitrary charge-to-mass ratio but the multiplication of the test particle and the gravitational source’s charge-to-mass ratios is much smaller than 1.
期刊:
STUDIES IN APPLIED MATHEMATICS,2022年148(1):186-218 ISSN:0022-2526
通讯作者:
Chunhua Ou
作者机构:
[Pan, Chaohong; Wang, Hongyong] Univ South China, Sch Math & Phys, Hengyang, Peoples R China.;[Ou, Chunhua] Mem Univ Newfoundland, Dept Math & Stat, St John, NF A1C 5S7, Canada.
通讯机构:
[Chunhua Ou] D;Department of Mathematics and Statistics, Memorial University of Newfoundland, St. John's, Newfoundland, Canada
作者机构:
[Chen, Xue-Kun; Hu, Xiao-Yan] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Jia, Pin-Zhen] Hunan Inst Technol, Dept Math & Phys, Hengyang 421002, Peoples R China.;[Xie, Guo-Feng] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China.;[Xie, Guo-Feng] Hunan Univ Sci & Technol, Hunan Prov Key Lab Adv Mat New Energy Storage & C, Xiangtan 411201, Peoples R China.
通讯机构:
[Pin-Zhen Jia] D;[Guo-Feng Xie] S;School of Materials Science and Engineering & Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion, Hunan University of Science and Technology , Xiangtan 411201, China<&wdkj&>Department of Mathematics and Physics, Hunan Institute of Technology , Hengyang 421002, China
期刊:
Journal of Radioanalytical and Nuclear Chemistry,2022年331(11):4503-4511 ISSN:0236-5731
通讯作者:
Yong Liu<&wdkj&>Yifan Chen
作者机构:
[Lin, Dongying; Chen, Yifan; Dai, Xingwang; Chen, Zhangkai] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Fang, Shijie] Univ South China, Sch Elect Engn, Hengyang 421001, Hunan, Peoples R China.;[Wu, Xianwei] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.;[Liu, Yong] Shenzhen Univ, Coll Phys & Optoelect Engn, Shenzhen 518000, Guangdong, Peoples R China.
通讯机构:
[Yong Liu] C;[Yifan Chen] S;College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, China<&wdkj&>School of Resources Environmental and Safety Engineering, University of South China, Hengyang, China
摘要:
To study the law of uranium tailings impoundment cover fissures and radon exhalation under the continuous heat and insolation conditions, the soil and uranium tailings samples from South China are made into the uranium tailings impoundment scale mode. The model was placed in a climate chamber for continuous heat and insolation environments. The fissures rate, radon exhalation rate and electrical conductivity of the model soil layer were calculated and analyzed. The results show that: (1) the radon exhalation rate and fissure ratio have the same variation pattern (2) the electrical conductivity characterization correlates with fracture rate and precedes fracture rate, which may predict the fissure growth. (3) When the experimental time exceeded 21 h, the electrical conductivity and the radon exhalation rate change showed a strong inverse correlation.