Systematic study of α decay half-lives based on Gamow–like model with a screened electrostatic barrier
作者：
Cheng, Jun-Hao;Chen, Jiu-Long;Deng, Jun-Gang;Wu, Xi-Jun;Li, Xiao-Hua* ;...
期刊：
Nuclear Physics A ,2019年987:350-368 ISSN：0375-9474
通讯作者：
Li, Xiao-Hua
作者机构：
[Cheng, Jun-Hao; Li, Xiao-Hua; Deng, Jun-Gang; Chen, Jiu-Long] 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.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.;[Chu, Peng-Cheng] Qingdao Technol Univ, Sch Sci, Qingdao 266000, Shandong, Peoples R China.
通讯机构：
[Li, Xiao-Hua] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
alpha decay;Gamow-like model;Electrostatic shielding;Un-synthesized nuclei
摘要：
In the present work we systematically study alpha decay half-lives of Z > 51 nuclei using the modified Gamow-like model which includes the effects of the centrifugal potential and electrostatic shielding. For the case of even-even nuclei, this model contains two adjustable parameters: the parameter a related to the screened electrostatic barrier and the radius constant r(0), while for the case of odd-odd and odd-A nuclei, it is added a new parameter i.e. hindrance factor h which is used to describe the effect of an odd-proton and/or an odd-neutron. Our calculations can well reproduce the experimental data. In addition, we use this modified Gamow-like model to predict the alpha-decay half-lives of seven even-even nuclei with Z = 120 and some un-synthesized nuclei on their alpha decay chains. (C) 2019 Elsevier B.V. All rights reserved.
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Adsorption and Desorption of Tritium in Nuclear Graphite at 700 degrees C: A Gas Chromatographic Study Using Hydrogen
作者：
Deng, Ke;Zhang, Mingjun;Wu, Xijun;Zhang, Qin;Yang, Guo;...
期刊：
Nuclear Technology ,2019年205(9):1143-1153 ISSN：0029-5450
通讯作者：
Wang, Guanghua
作者机构：
[Deng, Ke; Wang, Guanghua; Yang, Guo; Liu, Wei; Zhang, Mingjun; Zhang, Qin; Ma, Zhaowei; Wei, Fei] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.;[Deng, Ke; Yang, Guo; Zhang, Mingjun; Zhang, Qin; Ma, Zhaowei; Wei, Fei] Univ Chinese Acad Sci, Beijing 100049, Peoples R China.;[Wu, Xijun] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Wang, Guanghua] C;Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
关键词：
Tritium;dynamic adsorption and desorption;nuclear graphite decontamination
摘要：
Because of its high content in irradiated nuclear graphite, tritium is treated as one of the most important radionuclides, and it should be carefully decontaminated before the final disposal of nuclear graphite. Tritium has similar chemical and physical characteristics to those of hydrogen; therefore, in this research, the adsorption and desorption of tritium in nuclear graphite using hydrogen were studied. Three kinds of nuclear graphite, IG-110, NBG-18, and NG-CT-10, were used to conduct adsorption and desorption experiments using a new method based on gas chromatography; subsequently, a first-principles calculation on graphene was carried out to simulate the desorption of hydrogen from graphite. The results showed that tritium can be weakly and strongly adsorbed in nuclear graphite. The differences found in the amount of weak adsorption within nuclear graphite were mainly due to the graphite’s porosity and Brunauer-Emmett-Teller surface area, as reported previously in similar research. The mechanism for the strong adsorption was not explained clearly; it could be attributed to the results of a combination of the various physical properties of the graphite, especially the average pore size. The amount of weakly adsorbed hydrogen ranged from 48.4% to 95.2% of the total amount of adsorption for the nuclear graphite working at a temperature of 350°C. The weakly adsorbed tritium easily escaped from the nuclear graphite, indicating that this fraction of tritium would be the main source of pollution during the dismantling or the transportation of decommissioned graphite materials. In addition, the strongly adsorbed hydrogen began to be desorbed when the nuclear graphite was heated over 600°C, and 14% to 71% of the stably adsorbed hydrogen was desorbed when the temperature reached 700°C. A first-principles calculation indicated the activation energy for desorption of tritium from graphene to be about 2.17 eV. © 2019, © 2019 American Nuclear Society.
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英文
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Adsorption and desorption of hydrogen on/from single-vacancy and double-vacancy graphenes
作者：
Wu, Xi-Jun* ;Fei, Ze-Jie;Liu, Wen-Guan* ;Tan, Jie;Wang, Guang-Hua;...
期刊：
核技术(英文版) ,2019年30(4):1-9 ISSN：1001-8042
通讯作者：
Wu, Xi-Jun;Liu, Wen-Guan
作者机构：
[Wu, Xi-Jun; Chen, Xue-Kun; Xiao, De-Tao] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Deng, Ke; Liu, Wei; Liu, Wen-Guan; Wu, Xi-Jun; Wang, Guang-Hua; Fei, Ze-Jie; Wu, XJ; Liu, WG; Wu, Sheng-Wei] Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.;[Tan, Jie] Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Guangdong, Peoples R China.;[Xia, Dong-Qin] Chinese Acad Sci, Key Lab Neutron & Radiat Safety, Inst Nucl Energy Safety Technol, Hefei 230031, Anhui, Peoples R China.
通讯机构：
[Wu, Xi-Jun] U;[Wu, XJ; Liu, WG] C;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai 201800, Peoples R China.
关键词：
Hydrogen;Graphene;Single vacancy;Double vacancy;Adsorption;Desorption;First-principles calculation
摘要：
Adsorption and desorption of hydrogen on/from single-vacancy and double-vacancy graphenes were studied by means of first-principles calculations. The structure and stability of continuous hydrogenation in single vacancy were investigated. Several new stable structures were found, along with their corresponding energy barriers. In double-vacancy graphene, the preferred sites of H atoms were identified, and H2 molecule desorption and adsorption of from/on were calculated from the energy barriers. This work provides a systematic and comprehensive understanding of hydrogen behavior on defected graphene.
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英文
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Systematic study of proton radioactivity based on Gamow-like model with a screened electrostatic barrier
作者：
Chen, Jiu-Long;Li, Xiao-Hua* ;Cheng, Jun-Hao;Deng, Jun-Gang;Wu, Xi-Jun*
期刊：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS ,2019年46(6) ISSN：0954-3899
通讯作者：
Li, Xiao-Hua;Wu, Xi-Jun
作者机构：
[Cheng, Jun-Hao; Li, Xiao-Hua; Deng, Jun-Gang; Chen, Jiu-Long] 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.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, 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：
[Li, Xiao-Hua; Wu, Xi-Jun] U;[Li, Xiao-Hua] H;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
关键词：
electrostatic barrier;half-life;proton radioactivity
摘要：
In the present work we systematically study the half-lives of proton radioactivity for 51 ≤ Z ≤ 83 nuclei based on the Gamow-like model with a screened electrostatic barrier. In this model there are two parameters while considering the screened electrostatic effect of Coulomb potential with the Hulthen potential, i.e. the effective nuclear radius parameter r 0 and the screening parameter a. The calculated results can reproduce the experimental data well. In addition, we extend this model to predict the proton radioactivity half-lives of 16 nuclei in the same region within a factor of 2.94, whose proton radioactivity are energetically allowed or observed but not yet quantified. Meanwhile, studying of the proton radioactivity half-life by a type of universal decay law has been done. The results indicate that the calculated half-lives are linearly dependent on Coulomb parameter with the same orbital angular momentum. © 2019 IOP Publishing Ltd.
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英文
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Systematic study of proton radioactivity of spherical proton emitters within various versions of proximity potential formalisms
作者：
Deng, Jun-Gang;Li, Xiao-Hua* ;Chen, Jiu-Long;Cheng, Jun-Hao;Wu, Xi-Jun
期刊：
EUROPEAN PHYSICAL JOURNAL A ,2019年55(4):1-10 ISSN：1434-6001
通讯作者：
Li, Xiao-Hua
作者机构：
[Cheng, Jun-Hao; Li, Xiao-Hua; Deng, Jun-Gang; Chen, Jiu-Long] 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.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Li, Xiao-Hua] U;[Li, Xiao-Hua] H;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
摘要：
In this work we present a systematic study of the proton radioactivity half-lives of spherical proton emitters within the Coulomb and proximity potential model. We investigate 28 different versions of the proximity potential formalisms developed for the description of proton radioactivity, α decay and heavy particle radioactivity. It is found that 21 of them are not suitable to deal with the proton radioactivity, because the classical turning points r in cannot be obtained due to the fact that the depth of the total interaction potential between the emitted proton and the daughter nucleus is above the proton radioactivity energy. Among the other 7 versions of the proximity potential formalisms, it is Guo2013 which gives the lowest rms deviation in the description of the experimental half-lives of the known spherical proton emitters. We use this proximity potential formalism to predict the proton radioactivity half-lives of 13 spherical proton emitters, whose proton radioactivity is energetically allowed or observed but not yet quantified, within a factor of 3.71. © 2019, Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature.
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英文
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Tunable thermal rectification in graphene/hexagonal boron nitride hybrid structures
作者：
Chen, Xue-Kun* ;Hu, Ji-Wen;Wu, Xi-Jun;Jia, Peng;Peng, Zhi-Hua;...
期刊：
Journal of Physics D: Applied Physics ,2018年51(8) ISSN：0022-3727
通讯作者：
Chen, Xue-Kun
作者机构：
[Wu, Xi-Jun; Peng, Zhi-Hua; Chen, Xue-Kun; Jia, Peng; Hu, Ji-Wen] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Chen, Ke-Qiu] Hunan Univ, Sch Phys & Elect, Dept Appl Phys, Changsha 410082, Hunan, Peoples R China.;[Chen, Ke-Qiu] Synerget Innovat Ctr Quantum Effects & Applicat H, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Chen, Xue-Kun] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
关键词：
thermal rectification;hybrid nanostructures;phonon resonance;molecular dynamics
摘要：
Using non-equilibrium molecular dynamics simulations, we investigate thermal rectification (TR) in graphene/hexagonal boron nitride (h-BN) hybrid structures. Two different structural models, partially substituting graphene into h-BN (CBN) and partially substituting h-BN into graphene (BNC), are considered. It is found that CBN has a significant TR effect while that of BNC is very weak. The observed TR phenomenon can be attributed to the resonance effect between out-of-plane phonons of graphene and h-BN domains in the low-frequency region under negative temperature bias. In addition, the influences of ambient temperature, system size, defect number and substrate interaction are also studied to obtain the optimum conditions for TR. More importantly, the TR ratio could be effectively tuned through chemical and structural diversity. A moderate C/BN ratio and parallel arrangement are found to enhance the TR ratio. Detailed phonon spectra analyses are conducted to understand the thermal transport behavior. This work extends hybrid engineering to 2D materials for achieving TR.<br/> ©2018 IOP Publishing Ltd.
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英文
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α decay properties of ~(296)Og within the two-potential approach
作者：
Deng, Jun-Gang;Zhao, Jie-Cheng;Chen, Jiu-Long;Wu, Xi-Jun* ;Li, Xiao-Hua
期刊：
中国物理C ,2018年42(4): 044102-1-044102-5 ISSN：1674-1137
通讯作者：
Wu, Xi-Jun
作者机构：
[Li, Xiao-Hua; Zhao, Jie-Cheng; Deng, Jun-Gang; Chen, Jiu-Long] 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.;[Li, Xiao-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Li, Xiao-Hua] Hunan Normal Univ, Key Lab Low Dimens Quantum Struct & Quantum Contr, Changsha 410081, Hunan, Peoples R China.
通讯机构：
[Wu, Xi-Jun] U;Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.
关键词：
a decay;~(296)Og;hindrance factor;two-potential approach
摘要：
The present work is a continuation of our previous paper [J.-G. Deng, et al., Chin. Phys. C, 41: 124109 (2017)]. In the present work, the a decay half-life of the unknown nucleus 2960g is predicted within the two-potential approach and the hindrance factors of all 20 even-even nuclei in the same region as ~(296)Og, i.e. proton number 82<Z<126 and neutron number 152<N<184, from ~(250)Cm to ~(294)Og, are extracted. The prediction is 1.09 ms within a factor of 5.12. In addition, based on the latest experimental data, a new set of parameters of a decay hindrance factors for the even-even nuclei in this region, considering the shell effect and proton-neutron interaction, are obtained.
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基于氢研究核石墨中氚的去除
作者：
邓珂;马玉华;秦来来;刘佳煜;张钦;...
期刊：
核技术 ,2018年41(5):61-67 ISSN：0253-3219
通讯作者：
Liu, W.
作者机构：
[刘卫; 王广华] Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai, 201800, China;University of Chinese Academy of Sciences, Beijing, 100049, China;[吴喜军] College of Maths and Physics, University of South China, Hengyang, 421001, China;[秦来来; 马兆伟; 杨果; 邓珂; 马玉华; 刘佳煜; 张钦; 卫飞] Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai, 201800, China, University of Chinese Academy of Sciences, Beijing, 100049, China
通讯机构：
[Liu, W.] S;Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai, China
关键词：
核石墨去污;吸附;解吸;氢;氚
摘要：
世界现阶段有大量的退役核石墨需要处理,3H和14C为其中含量最多、需重点去污核素。对于14C来说,低温(不高于700 ℃)低氧环境下的热处理能比较有选择性地去除核石墨中的14C。基于氚是氢的同位素、与氢具有相同的物理化学特性,本研究通过对三种不同产地的核石墨中氢在350 ºC的吸附以及400~700 ºC的解吸行为,探究核石墨中氚的去污工艺。实验发现:三种核石墨的氢吸附量不同,解吸规律大致相同,解吸量随时间的变化上有差异。国产核石墨NG-CT-10、日本核石墨IG-110以及德国核石墨NBG-18的氢总吸附量分别为6.7×10~(–3) mL·g~(–1)、9.30×10~(–3) mL·g~(–1)以及9.12×10~(–3) mL·g~(–1),其中化学吸附量分别为3.2×10~(–3) mL·g~(–1)、 3.0×10~(–3) mL·g~(–1)和0.92×10~(–3) mL·g~(–1)。石墨对氢吸附量上的差异可能来源于三种核石墨的不同制备工艺和物理性质上的一些差异,这些差异主要来自于平均孔径、比表面积、成型工艺以及焦粒粒径上的区别;NG-CT-10有效吸附量所占比最高,表明NG-CT-10有较大量的氚吸附量。400~700 ºC的核石墨氢解吸实验表明:三种石墨中的氢主要是从700 ºC开始有效解吸,但各自相对于总吸附量的解吸量有明显区别,NG-CT-10、IG-110和NBG-18在700 ℃时的解吸量分别为7%、13.5%和70%。由此可得,NBG-18中的氚最易被解吸出来。根据氢在石墨中的吸附模型,700 ºC解吸出来的氢应该位于石墨晶粒边缘。为了解吸剩余氚,同时不影响14C的有效去除,不提高热处理温度,可能需要改变解吸时的载气组分。
语种：
中文
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熔盐堆中石墨吸附氚的理论研究
作者：
吴喜军;钱楠;王广华;黄豫;邓柯;...
期刊：
核技术 ,2018年41(6):060602-1-060602-5 ISSN：0253-3219
通讯作者：
Zeng, Y.
作者机构：
南华大学数理学院;中国科学院上海应用物理研究所;[吴喜军] 南华大学数理学院, 衡阳, 421001 中国科学院上海应用物理研究所, 上海, 201800;[钱楠; 王广华; 黄豫; 邓柯; 曾友石; 吴胜伟; 刘文冠; 刘卫] 中国科学院上海应用物理研究所, 上海, 201800;[陈学坤] 南华大学数理学院, 衡阳, 421001
通讯机构：
Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, China
关键词：
氚;氟;石墨;吸附;第一性原理;熔盐堆
摘要：
为明确石墨表面的氟、氟化氚中的氟和单空位缺陷对氚吸附的影响机理,利用第一性原理模拟研究熔盐堆中石墨对氚的吸附,研究了在完整石墨和单空位石墨表面上氢原子(离子)、氟原子(离子)、氟气分子与氟化氢分子的吸附行为。研究发现:当氟和氢同时存在的时候,氟会优先和石墨表面的碳原子成键;石墨表面的单空位促使氟化氢在单空位处解离,以化学吸附形成存在;石墨表面吸附氢(或者氚)、氟后,表面会发生畸变;可预测熔盐堆运行过程中,氚会优先在反应堆中的石墨表面的单空位等反应活性强的地方吸附、积聚。
语种：
中文
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222Rn/220Rn子体连续测量仪研制
作者：
吴喜军;李志强;单健;周青芝
期刊：
核电子学与探测技术 ,2017年37(3):289-294 ISSN：0258-0934
作者机构：
[吴喜军] 南华大学核科学技术学院,湖南衡阳421001;[吴喜军] 南华大学数理学院,湖南衡阳421001;南华大学核科学技术学院,湖南衡阳,421001;[李志强; 周青芝; 单健] 南华大学
关键词：
222Rn/220Rn子体;累积活度函数;连续测量;α能谱法
摘要：
实验研制了基于oα能谱法的222Rn/220Rn子体连续测量仪.该仪器采用微孔滤膜采样,采用PIPS探测器与α能谱测量技术实现222Rn、220Rn子体的α粒子计数与测量.实验测试表明:在不更换滤膜的前提下,可实现222 Rn/220 Rn子体的活度浓度及潜能的有限次连续测量;测222Rn、220Rn子体活度浓度的下限为10 Bq/m3,222Rn子体活度浓度为100 Bq/m3时的测量合成不确定度优于10％.
语种：
中文
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Systematic study of α preformation probability of nuclear isomeric and ground states
作者：
Sun, Xiao-Dong;Wu, Xi-Jun;Zheng, Bo;Xiang, Dong;Guo, Ping;...
期刊：
中国物理C ,2017年41(1):014102-1-014102-7 ISSN：1674-1137
通讯作者：
Li, Xiao-Hua
作者机构：
[Guo, Ping; Wu, Xi-Jun; Sun, Xiao-Dong] Univ South China, Sch Math & Phys, Hengyang 421001, Peoples R China.;[Zheng, Bo; Li, Xiao-Hua; Xiang, Dong] Univ South China, Sch Nucl Sci & Technol, 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：
[Li, Xiao-Hua] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.
关键词：
α decay;α preformation probability;nuclear isomer;two-potential approach
摘要：
In this paper, based on the two-potential approach combining with the isospin dependent nuclear potential, we systematically compare the α preformation probabilities of odd-A nuclei between nuclear isomeric states and ground states. The results indicate that during the process of α particle preforming, the low lying nuclear isomeric states are similar to ground states. Meanwhile, in the framework of single nucleon energy level structure, we find that for nuclei with nucleon number below the magic numbers, the α preformation probabilities of high-spin states seem to be larger than low ones. For nuclei with nucleon number above the magic numbers, the α preformation probabilities of isomeric states are larger than those of ground states.
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英文
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222Rn/220Rn及其子体测量系统的软件设计
作者：
胡轶豪;肖德涛;吴喜军;单健;李志强
期刊：
核电子学与探测技术 ,2016年36(2):140-143 ISSN：0258-0934
通讯作者：
Wu, X.-J.
作者机构：
[胡轶豪] 南华大学核科学技术学院，湖南衡阳421001;南华大学数理学院，湖南衡阳421001;南华大学核科学技术学院,湖南衡阳,421001;南华大学数理学院,湖南衡阳,421001;[李志强; 肖德涛; 吴喜军; 单健] 南华大学
通讯机构：
School of Mathematics and Physics, University of South China, Hengyang, Hunan, China
关键词：
连续监测;上位机;设计;触摸屏
摘要：
本文基于^（222）Rn/^（220）Rn测量仪与^（222）Rn/^（220）Rn子体测量仪,利用VC＋＋开发环境的MFC框架开发了一套上位机触摸屏软件系统。该软件系统具有实时监控和图形处理、历史数据查询和分析、参数设置和运行控制、报表打印和导出等功能,经长期测试,本软件能满足测量环境^（222）Rn/^（220）Rn及其子体的连续监测的需求。
语种：
中文
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碳纳米管聚合物复合材料导电性能研究
作者：
谢凝钰;彭志华;郭萍;吴喜军;胡林华;...
期刊：
洛阳理工学院学报(自然科学版) ,2016年26(2):10-14+18 ISSN：1674-5043
作者机构：
南华大学 数理学院，湖南 衡阳42001;[张亚楠; 彭志华; 吴喜军; 郭萍; 胡林华; 谢凝钰] 南华大学
关键词：
碳纳米管;聚合物;交叠接触模型;导电性能;电子隧道效应
摘要：
提出了聚合物基碳纳米管的交叠接触模型。深入探讨了碳纳米管和聚合物两种组分材料各自的电导率与质量分数、碳纳米管的几何参数和碳纳米管连接处聚合物基质填缝小区域中的电子隧道效应等因素对碳纳米管聚合物复合材料导电性能的影响，导出了碳纳米管聚合物复合材料的电导率公式。数值计算了不同条件下多壁碳纳米管苯氧基复合材料和多壁碳纳米管聚苯醚砜复合材料的电导率对数。模拟结果表明：适当增加碳纳米管的质量分数能显著改善复合材料的导电性能；增大碳纳米管的弯曲度会导致材料的导电性能明显减弱；对于每一种碳纳米管聚合物复合材料，碳纳米管质量分数存在一个临界值，超过临界值时，随着碳纳米管质量分数增加，电导率的增加逐渐变缓，并最终趋于一个定值，即在复合物中形成了比较稳定的导电网络。理论值与已获得的实验数据相吻合。
语种：
中文
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α放射性气溶胶沉积对微孔滤膜自吸收的影响研究
作者：
吴喜军;肖德涛;王佳;单健;周青芝;...
期刊：
核电子学与探测技术 ,2015年35(4):347-349and353 ISSN：0258-0934
通讯作者：
Xiao, D.-T.
作者机构：
[吴喜军] 南华大学核科学技术学院，湖南衡阳421001;南华大学数理学院，湖南衡阳421001;南华大学核科学技术学院,湖南衡阳,421001;[肖德涛; 金畅; 周青芝; 王佳; 单健] 南华大学;[吴喜军] 南华大学数理学院，湖南衡阳421001
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词：
微孔滤膜;α放射性气溶胶;自吸收因子;α能谱法;222Rn子体;220Rn子体
摘要：
模拟基于α能谱法的混合222 Rn、220 Rn子体测量程序，分别就醋酸纤维素酯微孔滤膜对222 Rn、220 Rn各α放射性子体的自吸收进行了实验研究。研究结果表明：该滤膜对222 Rn、220 Rn 子体的自吸收以及同种滤膜间的差异较小，可取0．978为α能谱法（或总α法）的滤膜自吸收因子；微孔滤膜模拟α能谱法以120 min为测量周期，重复使用时沉积在滤膜表面的α放射性气溶胶对滤膜自吸收的影响可忽略。
语种：
中文
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222^Rn/^220Rn子体连续测量仪采集α能谱的峰重叠因子研究
作者：
吴喜军;肖德涛;李志强;周青芝;金畅;...
期刊：
核电子学与探测技术 ,2015年35(2):176-179 ISSN：0258-0934
通讯作者：
Xiao, D.-T.
作者机构：
[吴喜军] 南华大学核科学技术学院，衡阳421001;南华大学数理学院，衡阳421001;南华大学核科学技术学院,衡阳,421001;[黄成; 李志强; 肖德涛; 金畅; 周青芝] 南华大学;[吴喜军] 南华大学数理学院，衡阳421001
通讯机构：
School of Nuclear Science and Technology, University of South China, Hengyang, China
关键词：
连续测量;峰重叠因子;222Rn子体;220Rn子体;α能谱法
摘要：
为配合222^Rn/220^Rn子体连续测量仪的研制,开展了用222^Rn/220^Rn子体测量仪采集α能谱的峰重叠因子研究。本研究以国家标准222^Rn室与220^Rn室分别作为纯222Rn子体与220^Rn子体测量环境,用222^Rn/220^Rn子体连续测量仪采集222^Rn子体与220^Rn子体α能谱,求得各α能峰的重叠因子。研究结果表明：非真空条件下220Rn子体发射的8.78Me Vα粒子慢化到7.69Me Vα能谱峰计数区,以及222^Rn子体发射的7.69Me Vα粒子慢化到6.00Me Vα能谱峰计数区的概率较大,可取0.0335、0.1791作为表征α能谱峰重叠情况的峰重叠因子θ1、θ2典型值。而8.78Me Vα粒子慢化到6.00Me Vα能谱峰计数区的概率非常小,其峰重叠因子θ3可以忽略;同一张滤膜重复多次使用并未导致峰重叠因子显著的变化,且不同滤膜的峰重叠因子的差异在2%以内,对测量仪测量误差的贡献有限。
语种：
中文
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基于半导体探测法220Rn测量仪的准确刻度
作者：
吴喜军;李志强;单健;周青芝;黄成
期刊：
南华大学学报(自然科学版) ,2015年(3):6-8 ISSN：1673-0062
作者机构：
南华大学 数理学院,湖南 衡阳,421001;南华大学 核科学技术学院,湖南 衡阳,421001;[黄成; 李志强; 吴喜军; 周青芝; 单健] 南华大学
关键词：
连续测量仪;峰重叠因子;220Rn测量仪;刻度
摘要：
采用多道脉冲幅度分析器测定216 Po 6.78 MeV能谱峰对6.00 MeV计数区的峰重叠因子μ为0.0897.将流气式固体220 Rn源作为标准源测定220 Rn测量仪测220 Rn刻度系数为9.4004.提高了半导体探测法型220 Rn测量仪刻度的准确性与测220 Rn准确度.
语种：
中文
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“卓越医生教育培养计划”背景下医用物理学的教学改革
作者：
吴喜军;彭志华;胡继文;贾鹏;杜丹;...
期刊：
科教文汇(下旬刊) ,2015年(24):38-39 ISSN：1672-7894
作者机构：
南华大学数理学院 湖南·衡阳 421001;[胡继文; 彭志华; 胡苹; 吴喜军; 杜丹; 吕云宾; 贾鹏] 南华大学
关键词：
医用物理学;教学改革;临床应用
摘要：
本文总结了南华大学医用物理学课程教学中存在的问题,并从教学目标、教学内容的选择、教学模式的改革、教学手段的整合、教学团队的建设、评价体系的建立等六个方面进行了探索。希望通过对"卓越医生班"与"卓越免费全科医生班"的医用物理学课程的教学改革,以点带面真正实现"老师好教、学生好学"的双赢局面,以适应学校施行"卓越医生教育培养计划"的新形势。
语种：
中文
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短程关联对核内核子动量分布的影响
作者：
李小华;李明;吴喜军;向东;郑波
期刊：
西北大学学报(自然科学版) ,2014年44(6):890-892,903 ISSN：1000-274X
作者机构：
[李小华; 李明; 向东; 郑波] 南华大学核科学技术学院;[吴喜军] 南华大学数理学院
关键词：
短程关联;动量分布;费米动量
摘要：
原子核内核子的动量分布对于研究原子核结构的性质至关重要,核子关联是影响核内核子动量分布的一个重要因素。文中基于核内核子短程关联的性质,分析研究了核内核子的动量分布,并计算了一些原子核内核子处在费米面以上的几率,计算结果与实验数据符合得很好。
语种：
中文
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《麻醉设备学》教学中多媒体技术作用浅析
作者：
吴喜军;彭志华;贾鹏;胡继文;吕云宾
期刊：
中国科教创新导刊 ,2014年(02):177 ISSN：1673-9795
作者机构：
南华大学数理学院 湖南衡阳 421001;[胡继文; 彭志华; 吴喜军; 吕云宾; 贾鹏] 南华大学
关键词：
多媒体技术;《麻醉设备学》;临床实践
摘要：
南华大学物理教研室在充分调研麻醉专生学生培养方案与培养目标的基础上,结合《麻醉设备学》课程的教学特点,探讨了多媒体技术在《麻醉设备学》教学中的地位、作用及注意事项.以实现多媒体技术更好地藏务于教与学的过程.
语种：
中文
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色散光学模型中色散积分的解析和数值计算
作者：
宋誉;吴喜军;郑波;向东;谢安平;...
期刊：
广西物理 ,2013年(03):14-16 ISSN：1003-7551
作者机构：
1. 南华大学核科学技术学院核物理系;2. 南华大学数理学院;3. 南开大学物理科学学院
关键词：
色散光学模型;色散积分;数值积分
摘要：
利用解析和数值计算的方法计算了色散光学模型中色散积分的数值,并与Quesada等人的解析计算作了比较,结果显示两者结果基本一致。
语种：
中文
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