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Entropic stochastic resonance in a confined structure driven by dichotomous noise and white noises

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chinese Physics B 2012年第8期21卷 71-77页

作者：郭锋程晓锋李少甫曹文黎恒 School of Information engineering Southwest University of Science and Technology research Center of laser fusion China Academy of Engineering Physics

The entropic stochastic resonance （ESR） in a confined system subjected to dichotomous noise and white noise and driven by a periodic sinusoidal force along the x axis of the structure and a time-dependent force in the declining direction, is investigated. Under the adiabatic approximation condition and based on the two-state theory, the expression of the output signal-to-noise ratio （SNR） is obtained. The results show that the SNR is a non-monotonic function of the strengths of dichotomous noise, white noise, and correlated strength of correlated noise. In addition, the SNR varies non-monotonically with the increase of the shape parameters of the confined structure, and also with the increase of the constant force along the y axis of the structure. The influence of the correlation rate of the dichotomous noise, and that of the frequency of the periodic force on the SNR are discussed.

关键词： entropic stochastic resonance dichotomous noise correlated noise square-wave signal,signal-to-noise ratio

Effect of Lanthanum-praseodymium-cerium Mischmetal on Mechanical Properties and Microstructure of Mg-A1 Alloys

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Journal of Wuhan University of Technology(Materials Science) 2011年第1期26卷 102-104页

作者：易勇 research Center of laser fusion China Academy of Engineering Physics School of Materials Science & engineering Southwest University of Science & Technology

The effects of lanthanum-praseodymium-cerium mischmetal （LPC） on the microstructure and mechanical properties of Mg-Al alloy were investigated. With the addition of LPC, an additional rod-like Al11La3 phase was deposited in the alloy. LPC greatly improves the tensile strength of cast Mg-Al alloys but negatively affects the elongation of cast alloys above 473 K. Cast alloys are strengthened by both precipitation strengthening and dispersion strengthening at ambient temperature. When the temperature exceeds 473 K, only the dispersion operates as a strengthening mechanism.

关键词： lanthanum-praseodymium-cerium mischmetal Mg-alloy microstructure mechanical properties

Theoretical study of aging effects on LaNi_(5) tritium storage

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Science china(Physics,Mechanics & Astronomy) 2005年第6期48卷 676-686页

作者： PING Feilin1,2, JIANG Gang1, ZHANG Lin2 & ZHU Zhenghe1 1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, china 2. research Center of laser fusion, mianyang 621.00, china 1. Institute of Atomic and Molecular Physics Sichuan University 610065 Chengdu China 2. research Center of laser fusion 621900 Miangyang China

The electronic structure and energy of La2Ni10H12 and La2Ni10H11He (He is at tetrahedral, octahedral or twelve-face polyhedral interstitials) double cells have been calculated using the density functional theory. Their equilibrium structure, energy bands, electronic density of states (DOS) and X-ray diffraction are presented and discussed. The results indicate the helium-3 produced due to the decay of tritium is most possibly sited at twelve-face polyhedral and octahedral interstices and changes the thermodynamic properties of LaNi5 tritide system. The changes due to aging such as the reduction in the isotherm plateau pressure, increase of the isotherm plateau slope, and appearance of deeply trapped hydrogen are caused not only by the lattice expansion, but also by modification of the electronic structure due to the presence of He.

关键词： LaNi5 alloy, density functional theory, electronic structure, aging.

Detecting the uniformity of TPX foam targets using -ray technology

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Detecting the uniformity of TPX foam targets using -ray te...

国家点火装置(NIF)点火靶制备技术研究进展

中国核学会核材料分会2007年度学术交流会

作者： Shan Wenwen~1 Zhang Lin (research Center of laser fusion,china academy of engineering Physics,mianyang 621.00)

The density uniformity of the foams used in inertial-confinement-fusion targets and Z-pinch loads is critical to understand the experimental *** average foam density used to be gravimetrically determined without providing any information on the density uniformity. This paper introduces a (?)-ray technology used to determine the density uniformity of foams. It shows that the (?)-ray technology can identify the spacial distribution of the density in a foam,thereby afford a new method for the process control in synthesizing foams.A comparison of the (?)-ray method with the gravimetry and the X-ray radiography is presented.

关键词： TPX foam Density uniformity beta radiation detecting technology

来源： cnki会议评论

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物理 2009年第12期38卷 914-919页

作者：杜凯唐永建中国工程物理研究院激光聚变研究中心绵阳621900

文章介绍了国家点火装置(NIF)点火靶制备技术在近年来取得的一些最新进展,主要内容包括芯轴与靶丸的制备,氘氚(DT)冰层的均匀化等方面.

关键词：国家点火装置(NIF) 靶丸柱腔

金属纳米团簇复合薄膜Au/BaTiO_3与Fe/BaTiO_3的PLD制备及其光吸收特征

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物理学报 2004年第3期53卷 932-935页

作者：王伟田杨光关东仪吴卫东陈正豪中国科学院物理研究所光物理开放实验室北京100080 中国工程物理研究院激光聚变研究中心绵阳621900

用脉冲激光沉积技术制备了掺杂纳米金属颗粒Au或Fe的BaTiO3复合薄膜 .用透射电子显微镜和x射线光电子能谱表征了金属颗粒的形态和化学态 .330— 80 0nm范围的吸收谱研究表明 ,掺Au颗粒的BaTiO3薄膜在 5 80nm附近有一个明显的共振吸收峰 ... 详细信息

用脉冲激光沉积技术制备了掺杂纳米金属颗粒Au或Fe的BaTiO3复合薄膜 .用透射电子显微镜和x射线光电子能谱表征了金属颗粒的形态和化学态 .330— 80 0nm范围的吸收谱研究表明 ,掺Au颗粒的BaTiO3薄膜在 5 80nm附近有一个明显的共振吸收峰 ,而掺Fe颗粒的BaTiO3薄膜没有这样的吸收峰 .

关键词：复合薄膜纳米金属颗粒脉冲激光沉积技术掺杂钛酸钡薄膜 Mie散射

Study on Thermodynamic Properties of Lithium by First-principles and Quasi-harmonic Debye Model

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Semiconductor Photonics and Technology 2010年第4期16卷 141-145页

作者： LEI Jiehong1,3, DUAN Hao2, XING Pifeng3, TANG Yongjian3 (1. Physics and Electronic Information Institute, china West Normal University, Nanchong 637002, CHN 2. Chemistry and Chemical engineering College, mianyang Normal University, mianyang 621.00, CHN 3. research Center of laser fusion, china academy of Engingeering Physics, mianyang 621.00, CHN) Physics and Electronic Information Institute China West Normal University Nanchong 637002 Chemistry and Chemical engineering College Mianyang Normal University Mianyang 621000 research Center of laser fusion China Academy of Engingeering Physics Mianyang 621900

In this paper, the lattice parameter and bulk modulus of lithium(Li) at different pressures and temperatures are calculated by using the density functional theory method within the generalized gradient approximation(GGA).Through the quasi-harmonic Debye model, the thermodynamic properties of Li are predicted. The dependences of the normalized primitive cell volume V/V0 on pressure P, the variation of the thermal expansion coefficient α with pressure P and temperature T, as well as the dependences of the heat capacity Cv on pressure P and temperature T are obtained systematically in the ranges of 0~100 GPa and 0~2 000 K.

关键词： density functional theory the quasi-harmonic Debye model thermodynamic properties

Theoretical analysis of radiation-balanced double clad fiber laser

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Optoelectronics Letters 2005年第3期 18-20页

作者： CHEN Ji-xin~(1,2**), SUI Zhan~2, CHEN Fu-shen~1, LI Ming-zhong~2, and WANG Jian-jun~21.Key Lab of Optical Fiber,School of Communication and Information engineering,University of Electronic Science and Technology,Chengdu 610054,china2.research Center of laser fusion,china academy of engineering Physics,mianyang 621.00,china

In this letter,a theoretical model of radiation-balanced double clad fiber laser is *** characteristic of the laser with Yb doped double clad fiber is analyzed *** is concluded that high output laser power can be obtained by selecting output coupling mirror with lower reflectivity,improving Yb doped concentration and choosing fiber length. This result can help us to design radiation balanced fiber laser.

关键词： Theoretical analysis of radiation-balanced double clad fiber laser length

三类构型激光脉冲压缩器光栅拼接误差容限比较

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物理学报 2011年第12期60卷 229-235页

作者：胡摇王逍朱启华北京理工大学光电学院北京100081 清华大学精密测试技术及仪器国家重点实验室北京100084 中国工程物理研究院激光聚变研究中心绵阳621900

建立了包含拼接光栅的三类典型构型(双程Z型、X型及菱型)激光脉冲压缩器的理论模型.利用光线追迹法计算压缩器引入的相位变化,结合傅里叶变换的方法仿真分析并比较了各压缩器相应的光栅拼接误差容限.以远场焦斑峰值能量下降到理想值的0.... 详细信息

建立了包含拼接光栅的三类典型构型(双程Z型、X型及菱型)激光脉冲压缩器的理论模型.利用光线追迹法计算压缩器引入的相位变化,结合傅里叶变换的方法仿真分析并比较了各压缩器相应的光栅拼接误差容限.以远场焦斑峰值能量下降到理想值的0.9倍为限确定了三类压缩器光栅拼接误差容限,明确了不同构型激光脉冲压缩器对拼接误差的敏感程度.这对脉冲压缩器的选型和设计具有指导意义.

关键词：光栅拼接脉冲压缩误差容限光线追迹