作者机构：
[Liu, Yong] Univ South China, Coll Elect Engn, Hengyang 421001, Peoples R China.;[Hu, Ji-wen; Xie, Ya-qian; Liu, Yong] Univ South China, Coll Math & Phys, Hengyang 421001, Peoples R China.
会议名称：
Conference on Biophysical-Society-of-GuangDong-Province-Academic-Forum - Precise Photons and Life Health (PPLH)
会议时间：
DEC 09-11, 2022
会议地点：
Guangzhou, PEOPLES R CHINA
会议主办单位：
[Liu, Yong] Univ South China, Coll Elect Engn, Hengyang 421001, Peoples R China.^[Liu, Yong;Hu, Ji-wen;Xie, Ya-qian] Univ South China, Coll Math & Phys, Hengyang 421001, Peoples R China.
会议论文集名称：
Proceedings of SPIE
关键词：
Atherosclerosis;Electromagnetic wave;Ablation of heat;Finite element method
摘要：
The purpose of this study is to explore the thermal damage of microwave to atherosclerotic plaques in order to achieve the purpose of treating atherosclerosis. In this paper, a fluid-solid-heat coupling model of thermal ablation of atherosclerotic plaque is established (The coupling model of blood-plaque-electromagnetic wave is studied in this paper, in which the thermal ablation of atherosclerotic plaque means that the electromagnetic wave is used to generate heat, and the temperature of atherosclerotic plaque tissue rises. If the cells in it reach the threshold of death temperature, they will be killed, so as to achieve the purpose of thermal ablation.). The electromagnetic field and bio-thermal equation are solved and analyzed by finite element method. By calculating the temperature and thermal damage distribution of microwave on atherosclerotic plaque, the effect of microwave on thermal ablation of atherosclerotic plaque was evaluated. The results show that the thermal damage degree of atherosclerotic plaque is positively correlated with electromagnetic wave frequency, electromagnetic wave power and heating time. The model shows that electromagnetic wave hyperthermia may provide a new therapeutic mode for thermal ablation of atherosclerotic plaques.
摘要：
Penta-graphene (PG), as a novel and stable pentagonal structure, has attracted considerable attention due to its large band gap, ultrahigh strength, negative Poisson's ratio, which indicates promising potential in nanoelectronics and nanomechanics. Thermal conductivity is a key physical quantity for the potential applications of PG based nano-devices. However, previous studies focused on the thermal conductivity of PG dominated by the well-known cubic anharmonic effect, and the quartic anharmonicity, although probably significant, was still neglected. In this work, we study the effect of four-phonon scattering on the thermal transport in PG through using first-principles calculations and solving the Boltzmann transport equation (BTE). We find that the intrinsic lattice thermal conductivity of PG is 182.1 W/mK at room temperature after including four-phonon scattering, which is reduced by 73.5 % as compared to the obtained results with only three-phonon scattering. Meanwhile, the relative contribution of the flexural acoustic (ZA) branch is reduced from 60.5 % to 32.5 % when four-phonon scattering is included. Thus, the large reduction in thermal conductivity can be ascribed to the large four-phonon scattering rates, which are completely comparable with those of three-phonon processes in the acoustic phonon frequency range even at 300 K. It is well believed that this finding is not a special case but should exist in other 2D materials with similar phonon features. Furthermore, the validity of the sum of three- and four-phonon scattering rates has been verified by the results based on the MD simulations. Our finding provides critical revisit and valuable insight to the exact thermal conductivity value of PG.
作者机构：
[Zhu, De-Xing; Li, Xiao-Hua; Xu, Yang-Yang; Hu, Xiao-Yuan] 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.;[Chu, Peng-Cheng] Qingdao Univ Technol, Res Ctr Theoret Phys, Sci Sch, Qingdao 266033, Peoples R China.;[Li, Xiao-Hua] Univ South China, Natl Exemplary Base Int Sci & Technol, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.
通讯机构：
[Xiao-Hua Li] S;School of Nuclear Science and Technology, University of South China, Hengyang, China<&wdkj&>National Exemplary Base for International Science and Technology. Collaboration of Nuclear Energy and Nuclear Safety, University of South China, Hengyang, China<&wdkj&>Cooperative Innovation Center for Nuclear Fuel Cycle Technology and Equipment, University of South China, Hengyang, China<&wdkj&>Key Laboratory of Low Dimensional Quantum Structures and Quantum Control, Hunan Normal University, Changsha, China
关键词：
Proton radioactivity;Gamow model;Half-lives
摘要：
In the present study, on the basis of the screened electrostatic effect of the Coulomb potential, we propose an improved Gamow model within the centrifugal potential in which there are only two adjustable parameters, i.e., the screened parameters t and g, which represent the combined effect of the interaction potential and reduced mass of the emitted proton-daughter nucleus on the half-life of proton radioactivity in the overlapping region. Using this model, we systematically calculated the proton radioactivity half-lives of 31 spherical nuclei and 13 deformed nuclei and obtained corresponding root-mean-square deviations of 0.274 and 0.367, respectively. The relationship between the proton radioactivity half-life of
$$^{177}$$
Tl
$$^{\mathrm{m}}$$
and the corresponding angular momentum l removed by the emitted proton is also discussed. In addition, we used the proposed model to predict the proton radioactivity half-lives of 18 nuclei whose proton radioactivity is energetically allowed or observed but not yet quantified in NUBASE2020. For comparison, we used the universal decay law of proton radioactivity proposed by Qi et al. (Phys Rev C 85:011303, 2012.
https://doi.org/10.1103/PhysRevC.85.011303
), and the new Geiger–Nuttall law of proton radioactivity proposed by Chen et al. (Eur Phys J 55:214, 2019.
https://doi.org/10.1140/epja/i2019-12927-7
).
作者机构：
[Zhang, Yiqing; Li, Zhenbo; Xu, Feng; Zhang, YQ] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
通讯机构：
[Zhang, YQ ] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
摘要：
The highly in-plane mechanical anisotropic black phosphorus (BP) has widely used in nanoelectromechanical systems. The dynamic behavior and thermoelastic damping of circular single-layered BP-based (CSLBP-based) mass sensor are investigated. Molecular dynamic (MD) simulations and circular orthotropic elastic plate (COEP) attached a concentrate mass are adopted to obtain the natural frequency of CSLBP attached atomic mass. Thermoelastic damping of CSLBP attached atomic mass is calculated by COEP attached a concentrate mass considering thermal effect. The effect of attachment mass and CSLBP size on the natural frequency of CSLBP attached atomic mass are discussed. The natural frequency of CSLBP-based mass sensor is very sensitive to the attachment mass. Thermoelastic damping of CSLBP-based attached atomic mass depends on the radius of CSLBP-based mass sensor, the attachment mass and the environmental temperature. The thermoelastic damping of CSLBP-based mass sensor decreased with increasing the attachment mass and the radius of CSLBP. The COEP can predict the dynamic behavior of CSLBP-based mass sensor.
期刊：
Fractal and Fractional,2023年7(2):142- ISSN：2504-3110
通讯作者：
Maoxin Liao
作者机构：
[Li, Weinan; Li, Bingbing; Liao, Maoxin; Chen, Huiwen] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Xu, Changjin] Guizhou Univ Finance & Econ, Guizhou Key Lab Econ Syst Simulat, Guiyang 550004, Peoples R China.
通讯机构：
[Maoxin Liao] S;School of Mathematics and Physics, University of South China, Hengyang 421001, China<&wdkj&>Author to whom correspondence should be addressed.
摘要：
In this paper, we study the stability and Hopf bifurcation of a class of six-neuron fractional BAM neural networks with multiple delays. Firstly, the model is transformed into a fractional neural network model with two nonidentical delays by using variable substitution. Then, by assigning a value to one of the time delays and selecting the remaining time delays as parameters, the critical value of Hopf bifurcation for different time delays is calculated. The study shows that when the time lag exceeds its critical value, the equilibrium point of the system will lose its stability and generate Hopf bifurcation. Finally, the correctness of theoretical analysis is verified by simulation.
期刊：
Communications in Nonlinear Science and Numerical Simulation,2023年118:107043 ISSN：1007-5704
通讯作者：
Changjin Xu
作者机构：
[Xu, Changjin] Guizhou Univ Finance & Econ, Guizhou Key Lab Econ Syst Simulat, Guiyang 550004, Peoples R China.;[Mu, Dan; Liu, Zixin; Pang, Yicheng] Guizhou Univ Finance & Econ, Sch Math & Stat, Guiyang 550004, Peoples R China.;[Liao, Maoxin] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Aouiti, Chaouki] Univ Carthage, Fac Sci Bizerta, UR13ES47 Res Units Math & Applicat, Bizerte 7021, Tunisia.
通讯机构：
[Changjin Xu] G;Guizhou Key Laboratory of Economics System Simulation, Guizhou University of Finance and Economics, Guiyang 550004, PR China
关键词：
Boundedness;Delay;Existence and uniqueness;Fractional-order 4D neural networks;Hopf bifurcation;Stability
摘要：
Delay has a vital influence on the dynamics of neural networks. Exploring the effect of time delay on the dynamics of neural networks has become a hot issue in mathematics and engineering fields. In this current manuscript, on the basis of the earlier publications, we put forward a new fractional-order 4D neural networks incorporating two different time delays. First of all, the existence and uniqueness, boundedness of the solution of the fractional-order 4D neural networks incorporating two different time delays. are analyzed by applying contraction mapping principle, construct of an adaptive function, respectively. Next, the stability and the emergence of Hopf bifurcation are explored by making use of the stability and bifurcation theory of fractional-order dynamical system. A series of novel stability criteria and bifurcation conditions guaranteeing the stability and the emergence of Hopf bifurcation of the considered fractional-order 4D neural networks under the different delay cases are built. What,s more, the impact of delay on stabilizing neural networks and controlling the emergence of Hopf bifurcation of neural networks is adequately uncovered. At last, Matlab simulation figures are presented to confirm scientificness of the derived prime conclusions. The derived prime conclusions of this manuscript are perfectly innovative and own momentous theoretical reference value in the control issue and design aspect of neural networks.(c) 2022 Published by Elsevier B.V.
期刊：
JOURNAL OF PHYSICS-CONDENSED MATTER,2023年35(7) ISSN：0953-8984
作者机构：
[Jia, Pin-Zhen; Xie, Zhong-Xiang; Deng, Yuan-Xiang; Yu, Xia; Xie, Jia-Ping; Zhang, Yong] Hunan Inst Technol, Dept Math & Phys, Hengyang 421002, Peoples R China.;[Chen, Xue-Kun] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Zhou, Wu-Xing; Zeng, Yu-Jia] Hunan Univ Sci & Technol, Sch Mat Sci & Engn, Xiangtan 411201, Peoples R China.;[Zhou, Wu-Xing; Zeng, Yu-Jia] Hunan Univ Sci & Technol, Hunan Prov Key Lab Adv Mat New Energy Storage & Co, Xiangtan 411201, Peoples R China.
关键词：
in-plane heterostructures;thermal conductivity;thermoelectric transport;two-dimensional materials;van der Waals heterostructures
摘要：
The rapid development of synthesis and fabrication techniques has opened up a research upsurge in two-dimensional material heterostructures, which have received extensive attention due to their superior physical and chemical properties. Currently, thermoelectric energy conversion is an effective means to deal with the energy crisis and increasingly serious environmental pollution. Therefore, an in-depth understanding of thermoelectric transport properties in two-dimensional heterostructures is crucial for the development of micro-nano energy devices. In this review, the recent progress of two-dimensional heterostructures for thermoelectric applications is summarized in detail. Firstly, we systematically introduce diverse theoretical simulations and experimental measurements of the thermoelectric properties of two-dimensional heterostructures. Then, the thermoelectric applications and performance regulation of several common two-dimensional materials, as well as in-plane heterostructures and van der Waals heterostructures, are also discussed. Finally, the challenges of improving the thermoelectric performance of two-dimensional heterostructures materials are summarized, and related prospects are described.
摘要：
This work principally probes into the stability, the existence, and control of Hopf bifurcation of new established fractional-order delayed bidirectional associative memory (BAM) neural networks with four neurons. Firstly, based on the earlier study, we set up a class of new fractional-order multiple delayed BAM neural networks with four neurons. Secondly, applying an appropriate variable transformation, we get a new equivalent fractional-order single delayed BAM neural networks with four neurons. With the aid of the stability theory and bifurcation knowledge of fractional-order differential dynamical systems, a novel sufficient criterion to guarantee the stability and the appearance of Hopf bifurcation of the addressed fractional-order delayed BAM neural networks is set up. Thirdly, designing a suitable time-delayed feedback controller, the stability region and the time of appearance of Hopf bifurcation for the involved neural networks have been adjusted. Finally, two simulation examples are presented to illustrate the rationality of the mathematical derivation results. The study vindicates that the time delay has great effect on the stability, bifurcation, and its control for involved network models. The obtained fruits of this work can be effectively applied to control and design neural networks. Also, some research ideas will play a key role in studying the related fractional-order dynamical models in actual world.
期刊：
Journal of Analysis,2023年31(2):881-897 ISSN：0971-3611
通讯作者：
Mi Zhou
作者机构：
[Mi Zhou] School of Mathematics and Physics, University of South China, Hengyang, People’s Republic of China
通讯机构：
[Mi Zhou] S;School of Mathematics and Physics, University of South China, Hengyang, People’s Republic of China
关键词：
Iterative fractional differential equations;Fractional Gronwall inequalities;Fixed point theorem;Existence
摘要：
In this paper, we discuss the existence and uniqueness of solutions for a class of nonlinear fractional quadratic iterative differential equations in Banach space C([0, T], [0, T]),
$$C_{L_T}([0,T],[0,T])$$
, and
$$C_{L_A}([0,T],[0,T])$$
, respectively. Our analysis is based on Schauder’s fixed point theorem, fractional Gronwall inequalities and Picard operator theory. Furthermore, our results can be extend to extra complex nonlinear terms. Finally, some examples are given to illustrate our results.
作者机构：
[Chen, Xue-Kun; Zhang, En -Ming] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Wu, Dan] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410114, Peoples R China.;[Chen, Ke-Qiu] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Peoples R China.
摘要：
Motivated by the synthesized Cu4TiSe4 with ultralow room-temperature thermal conductivity [Angew. Chem., Int. Ed. 60, 9106 (2021)], we systematically investigate its thermoelectric (TE) properties via combining Boltzmann transport equations and first-principles calculations. The results show that the thermal conductivity of Cu4TiSe4 determined considering only three-phonon scattering is reduced by about 40% after including four-phonon scattering at room temperature, indicating the importance of four-phonon scattering in phonon transport. On the other hand, the coexistence of high dispersion and valley degeneracy at the top valence band in the electronic structure causes a high power factor. Consequently, the isotropic figure of merit (ZT) value of 1.5 at 500 K is captured in the p-type doped Cu4TiSe4 . In addition, the value of ZT can be further enhanced to 2.2 by applying 2.25% triaxial tensile strain, which is ascribed to the remarkably enhanced four-phonon scattering processes induced by the tensile strain. Meanwhile, the significant suppression of thermal conductivity allows the optimal carrier concentration for the ZT peak to be reduced, which is of important practical significance for the experimental preparation of Cu4TiSe4 -based TE devices. Our results pave a way for the design of adjustable medium-temperature TE devices.
作者机构：
[Zhu, De-Xing; Li, Xiao-Hua; Xu, Yang-Yang; Li, XH] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Chu, Li-Jia] Anhui Univ Sci & Technol, Dept Chem Engn, Huainan 232001, Peoples R China.;[Wu, Xi-Jun; Wu, XJ] 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; Li, XH] Univ South China, Natl Exemplary Base Int Sci & Tech, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.
通讯机构：
[Li, XH ; Wu, XJ ] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;Univ South China, Natl Exemplary Base Int Sci & Tech, Collaborat Nucl Energy & Nucl Safety, Hengyang 421001, Peoples R China.;Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Equ, Hengyang 421001, Peoples R China.
关键词：
2p radioactivity;CPPM;Half-lives;Excited state
摘要：
In the present work, we extend the Coulomb and Proximity Potential Model (CPPM) to study two-proton (2p) radioactivity from excited states while the proximity potential is chosen as AW95 proposed by Aage Withner in 1995. Demonstration reveals that the theoretical results acquired by CPPM exhibit a high level of consistency with prior theoretical models such as the unified fission model (UFM), generalized liquid-drop model (GLDM) and effective liquid-drop model (ELDM). Furthermore, within the CPPM, we predicted the half-lives of potential 2p radioactive nuclei for which experimental data are currently unavailable. The predicted results were then assessed, compared with UFM, ELDM and GLDM models, and examined in detail.
摘要：
In this paper, the stability and Hopf bifurcation of a six-neuron fractional BAM neural network model with multiple delays are considered. By transforming the multiple-delays model into a fractional-order neural network model with a delay through the variable substitution, we prove the conditions for the existence of Hopf bifurcation at the equilibrium point. Finally, our results are verified by numerical simulations.
