摘要:
Existence, uniqueness and stability of forced pulsating waves as well as gap formation of reaction dif-fusion models in a shifting habitat are challenging problems in the field of propagation dynamics. In this paper, we design to tackle these problems for a time periodic Lotka-Volterra competition system. By using alternatively-coupling upper-lower solution method, we establish the existence of forced pulsating traveling wave, as long as the shifting speed falls in a finite interval where the end points are obtained from KPP-Fisher speeds. The asymptotic behaviors of the forced pulsating traveling wave are derived and this helps us show that this wave is unique. Moreover in the Lyapunov sense, the stability of the forced pulsating wave is also studied. Finally, when the forced speed is beyond the finite interval, gap formation is investigated theoretically and illustrated further by numerical simulations. (c) 2022 Elsevier Inc. All rights reserved.
期刊:
Journal of Radiation Research and Applied Sciences,2022年15(3):83-90 ISSN:1687-8507
作者机构:
[Chen, Yifan; Dai, Xingwang] Univ South China, Sch Resources Environm & Safety Engn, Hengyang 421001, Hunan, Peoples R China.;[Chen, Yifan; Dai, Xingwang; Xu, Zhenghua; Liu, Yong] Hunan Prov Engn Technol Res Ctr Uranium Tailings, Hengyang 421001, Peoples R China.;[Huang, Danxia; Hong, Yang] Univ South China, Sch Econ Management & Law, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Min] China Nucl Huachen Construct Engn Co LTD, Xian 710000, Shaanxi, Peoples R China.;[Xu, Zhenghua] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
关键词:
Uranium tailings pond;Interpreted structural model (ISM);Resilience;Risk coupling;Emergency management
摘要:
The safety of uranium tailings pond is closely related to social stability and economic development, so it is necessary to improve the emergency management of uranium tailings pond to ensure its safety by adjusting the emergency plan. The Interpretive Structural Model (ISM) is used to analyze the structural relationship between the main risk factors leading to the occurrence of emergencies. The results show that attention should be paid to the risk factors originating from humans and infrastructures, and effective management measures should be adopted in the process of emergency management, for example, people build tighter employee access system, clarify the responsibilities of employees at all levels, and improve monitoring and organizational means. Ac-cording to the results of ISM analysis, a structural risk control system can be constructed, and a defensive barrier that can effectively block the risk coupling transmission can be designed to prevent the risk from being trans-formed into an event. For other risks, system resilience management should be strengthened to respond to risks. The process is set as emergency response and accident response. Different management objects use different management methods to make emergency management work efficiently.
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 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
摘要:
Based on our direct shear creep experiment and the direct shear rheological constitutive model, a semi-empirical time-dependent parameter of the shear strength is obtained by Mohr-Coulomb shear strength theory, and different time-dependent traction force calculations between deep-sea sediment and a tracked miner are conducted by the work-energy principle. The time-dependent traction force calculation under its influencing factors, including the time, track shoe number, and grounding pressure, are analyzed and proved to be valid by the traction force experiment of a single-track shoe. The results show that the time-dependent cohesion force obtained by a semi-empirical way can be easily used to deduce the time-dependent traction force models under the different grounding pressure distributions and applied into deep-sea engineering application conveniently; the verified traction force models by the traction force experiment of a single-track shoe illustrate that traction force under the decrement grounding pressure distribution is the worst among the four kinds of grounding pressure distributions and suggested for evaluating the most unfavorable traction force and calculating the trafficability and stability of the deep-sea tracked miner.
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:
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
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.
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:
[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.