作者机构：
[Chen, You; Gong, Xueyu; Yu, Jun] Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.;[Gong, Xueyu] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Yu, Jun] U;Univ South China, Sch Math & Phys, Hengyang 421001, Hunan, Peoples R China.
关键词：
tokamak plasma;zonal flow;turbulence
摘要：
With the nonlinear dispersion relation derived, excitation of low frequency zonal flow by drift waves is examined in tokamak plasmas with toroidal rotation. It is shown that the growth rate of the low frequency zonal flow is decreased by the frequency shift of the geodesic acoustic mode and is increased by the additional nonlinear terms with toroidal rotation velocity. If the amplitude of the pump drift wave is greater than the threshold value, which is the function of the Mach number of the toroidal rotation, the toroidal rotation increases the nonlinear growth rate, otherwise, it decreases the nonlinear growth rate. There is always a finite nonlinear growth rate of the low frequency zonal flow if only there is a finite amplitude of the pump wave in tokamak plasmas with a finite velocity of the toroidal rotation.
作者机构：
[Zhang, Zhen-Hua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Zhen-Hua] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Hunan, Peoples R China.;[Wang, Chao; Guo, Xin-Heng] Beijing Normal Univ, Coll Nucl Sci & Technol, Beijing 100875, Peoples R China.
通讯机构：
[Zhang, Zhen-Hua] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.
关键词：
CP violation;Heavy baryon;Bottom quark
摘要：
We propose a new mechanism which can introduce large CP asymmetries in the phase spaces of three-body decays of heavy baryons. In this mechanism, a large CP asymmetry is induced by the interference of two intermediate resonances, which subsequently decay into two different combinations of final particles. We apply this mechanism to the decay channel Lambda(0)(b) -> p pi(0)pi(-), and find that the differential CP asymmetry can reach as large as 50%, while the regional CP asymmetry can reach as large as 16% in the interference region of the phase space. (C) 2015 The Authors. Published by Elsevier B.V.
期刊：
Journal of the Korean Physical Society,2015年66(11):1692-1696 ISSN：0374-4884
通讯作者：
Zhong, Yi-jun
作者机构：
[Zhong, Yi-jun; Gong, Xue-yu; Li, Xin-xia] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Hu, Ye-ming; Li, Xin-xia] Chinese Acad Sci, Inst Plasma Phys, Hefei 230031, Peoples R China.
通讯机构：
[Zhong, Yi-jun] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
Tokamak;Plasma equilibrium;Ion orbit;Particle loss rate
摘要：
By solving the Grad-Shafranov equation in the cylindrical coordinate system, we numerically obtain the tokamak plasma equilibrium configurations of the conventional mode and the high-to-lowfield-side current-reversal equilibrium mode (HL-CREC) by using the discharge parameters for the Experimental Advanced Superconductor Tokamak (EAST). By coupling with the particle’s motion equation, we obtain the orbits of trapped particles and passing particles under both equilibrium configurations. We find that the orbit of the passing particle in the HL-CREC is wholly confined on the low-field side and that the half width of the banana orbit of trapped particles increases greatly compared with those in the conventional equilibrium configuration. In addition, the ion loss is studied based on the Monte Carlo method. The results show that for ions near the plasma edge, a much high ion loss rate can be obtained in HL-CREC than that in the conventional equilibrium configuration.
作者机构：
[Zhang, Li; Zou, Yanhua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Li; Zou, Yanhua] Hunan Inst Technol, Inst Human Factors Engn & Safety Management, Hengyang 421002, Hunan, Peoples R China.;[Zhang, Li; Li, Pengcheng] Univ South China, Human Factor Inst, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Zhang, Li] H;Hunan Inst Technol, Inst Human Factors Engn & Safety Management, Hengyang 421002, Hunan, Peoples R China.
关键词：
Digital main control room;Dynamic network model;Human performance;Reliability forecasting;Situation assessment
摘要：
With the technical development of computer hardware and software, digitalization is a trend in large-scale complex systems such as nuclear power plants (NPPs). It changes the way main control room (MCR) operators interact with systems. Faced with these technical changes, operators need to continue improving their situation assessment (SA) reliability level. In addition to evaluate operators' SA reliability, managers and shift supervisors also want to forecast their SA reliability level. There have been many studies with respect to operators' SA, but most of them are static analysis method and cannot be applied to predict operators' SA reliability. So, on the basis of different forecasting approaches and observation data, how to predict the operators' SA reliability level has became a problem that many analyst interest in. In this paper, first we identified the influence factors associated with SA reliability, and then we developed the SA reliability model, finally we proposed a reliability forecasting model by integrating time series forecasting method with dynamic network model (DNM). Our experiment verification focused on steam generator tube rupture (SGTR) event, using the forecasting model, we demonstrated how to predict operators' SA reliability during the course, and the prediction results are consistent with measurement results. (C) 2015 Elsevier Ltd. All rights reserved.
摘要：
We theoretically investigate the Autler-Townes (AT) splitting in the photoelectron spectra of threelevel ladder K2 molecule driven by a pump-probe pulse via employing the time-dependent wave packet approach. The effect of the pump/probe laser intensity and wavelength on AT splitting is detailed studied. The magnitude of AT splitting increases with increasing the pump laser intensity, but does not vary with probe intensity. The double splitting with asymmetric profiles arises due to the nonresonant excitation. The double structure is transformed into one peak progressively as the pump is detuned from the resonance wavelength, which can be explained in terms of the asymmetric excitation/population of dressed states. The splitting between AT doublet changes with pump wavelength, but does not change with probe wavelength. The double peaks shift to lower energy with the different shift with increasing pump wavelength, but with the same shift with probe wavelength.
作者机构：
[Yin Lan; Du Dan] Univ South China, Dept Math & Phys, Hengyang 421001, Peoples R China.;[Gong Xueyu; Xiang Dong; Li Jingchun] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
通讯机构：
[Gong Xueyu] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
ICRH antenna;impedance matching;transmission line theory
摘要：
The impedance matching is crucial for continuous wave operation of ion cyclotron resonance heating (ICRH) antennae with high power injection into plasmas. A sudden increase in the reflected radio frequency power due to an impedance mismatch of the ICRH system is an issue which must be solved for present-day and future fusion reactors. This paper presents a method for theoretical analysis of ICRH system impedance matching for a triple liquid stub tuner under plasma operational conditions. The relationship of the antenna input impedance with the plasma parameters and operating frequency is first obtained using a global solution. Then, the relations of the plasma parameters and operating frequency with the matching liquid heights are indirectly obtained through numerical simulation according to transmission line theory and matching conditions. The method provides an alternative theoretical method, rather than measurements, to study triple liquid stub tuner impedance matching for ICRH, which may be beneficial for the design of ICRH systems on tokamaks.
摘要：
The electron cyclotron wave (ECW) current drive (CD) for the HL-2A tokamak is investigated numerically with a new ray-tracing and Fokker-Planck code. The code is benchmarked with other well-tested linear and quasilinear codes and is then used to study the electron cyclotron current drive on the HL-2A tokamak. The wave propagation, power deposition, and driven-current profiles are presented. The effect of electron trapping is also assessed. It is found that quasilinear effects are negligible at the present ECW power levels and that when both waves are injected at an angle of 20° on the plasma equatorial plane, the CD efficiency for the HL-2A saturates at ∼0.029 × 1020 A/W/m2 and ∼0.020 × 1020 A/W/m2 for the 0.5 MW/68 GHz first harmonic ordinary (O1) and 1 MW/140 GHz second harmonic extraordinary (X2) modes, respectively. The effects of the plasma density, temperature, and wave-launching position on the driven current are also investigated analytically and numerically.
摘要：
The effect of concentration of U(VI), hydrazine, nitric acid and the amount of catalyst, and the thermodynamics and kinetics of the reaction in preparing U(IV) by catalyzing and reducing U(VI) are studied in catalytic reduction of U(VI) with hydrazine as reductant and Pt as catalyst. The comparison of calculated theoretical reaction heat value and practical value is also given. The result shows that with the increase of density of U(VI) and hydrazine, increase of amount of catalyst and decrease of nitric acid, reaction rate slows down. The reaction kinetic rate equation is as follow: − dC(UO22+)/dt = kC1.11(UO22+)C1.42(N2H5+)C−0.72(H+), and the reaction rate constant is 1.3 · 10–3 (mol/L)–0.81/min when rS/L is 0.008 kg/L at 50 ℃. The theoretical reaction equation of unit volume is as follows: Q = aΔfHm,1Θ + ΔfHm,2Θ[C(N2H4) − C(UO22+)a/2 − β]/3. The comparison shows the coincidence in 1 h of theoretical value and practical value.
摘要：
This paper is a proposal to evaluate radioactivity of coal fly ash used in cement according the national standard titled “Limits of radionuclides in building materials”. Because concrete includes cement and nature materials with low radioactivity, we propose that the limits of radionuclides in cement contained coal fly ash can be two times relaxed than that of this national standard, and the limit of the internal exposure index on cement may be unnecessary. There is no obviously increase of the Rn-222 exhalation rate from aerated concrete block when the radium content is similar to that of common concrete block.
摘要：
Excited-states ab initio molecular dynamics model is employed to study the electronic stopping power of cubic silicon carbide nanocrystal when low-energy protons and helium ions are hyperchanneling in the [1 0 0], [1 1 0] and [1 1 1] major crystal axes. The energy transfer processes between the ions and the electronic subsystem of the cubic silicon carbide nanocrystalline are studied. The channeling effect in the electronic stopping power is determined by the unique electronic structure of these channels. The velocity-proportional stopping power is predicted for both protons and helium ions in the low-energy region. The calculated stopping power is in a quantitative agreement with the experimental data up to the stopping power maximum. The deviations of the stopping power of helium ions from the linear proportionality are attributed to the electron transfer at higher velocities. (C) 2014 Elsevier B.V. All rights reserved.
期刊：
Journal of Radioanalytical and Nuclear Chemistry,2015年303(1):867-876 ISSN：0236-5731
通讯作者：
Xiao, Zhihai
作者机构：
[Xiao, Zhihai; Gao, Yang] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Shao, Zhenyi] Chengdu Technol Univ, Dept Mech Engn, Chengdu 611730, Peoples R China.
通讯机构：
[Xiao, Zhihai] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
U(VI);Illite;Humic acid;Sorption;Desorption
摘要：
In this work, the effect of various environmental factors on U(VI) sorption to illite was investigated,such as pH, ionic strength, humic acid (HA) and temperature. U(VI) sorption to illite strongly depended on pH values, ionic strength and temperature. At pH < 6.0, the presence of HA obviously improved U(VI) sorption on illite, because of the strong complexation between HA and U(VI) on illite surface. However, a slight inhibiting effect appeared at pH > 6.0. The thermodynamic parameters (Delta HA degrees, Delta SA degrees and Delta GA degrees) calculated from the temperature dependent sorption isotherms indicated that U(VI) sorption on illite was endothermic and spontaneous. Desorption investigation indicated that U(VI) sorption on illite was reversible in the absence of HA. However, in the presence of HA, U(VI) sorption on illite was irreversible due to the strong complexation between HA and U(VI). U(VI) sorption on illite was mainly dominated by ion-exchange and outer-sphere complexation. The results are very important for estimating the uptake and transfer of U(VI) in the natural environment.
作者机构：
[Zhang, Li; Zou, Yanhua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Hunan, Peoples R China.;[Zhang, Li; Zou, Yanhua] Hunan Inst Technol, Inst Human Factors Engn & Safety Management, Hengyang 421002, Hunan, Peoples R China.;[Zhang, Li] Univ South China, Human Factor Inst, Hengyang 421001, Hunan, Peoples R China.
通讯机构：
[Zou, Yanhua] H;Hunan Inst Technol, Inst Human Factors Engn & Safety Management, Hengyang 421002, Hunan, Peoples R China.
关键词：
Boolean network;Digital main control room;Dynamic evolution;Human reliability analysis;Operators' behavior;Semi-tensor product
摘要：
Digitalization is a trend in large-scale complex systems such as nuclear power plants (NPPs). It changes the way main control room (MCR) operators interact with systems. Many studies shows that the adoption of digital technology has brought some new risks for MCR operators, and whether the reliability of these technologies can meet safety and economic requirements has become one of the urgent problems that NPPs must solve. The study consists of two parts. In Part I, we investigated the dynamic evolution of operators' four behaviors: monitoring and detection (MD), situation assessment (SA), response planning (RP), and response implementation (RI). This paper incorporates Boolean network (BN) analysis into the field of human reliability analysis (HRA), by applying semi-tensor product of matrix (STP), whereby the dynamics evolution of operators' behavior can be expressed in an algebraic form. Utilizing this algebraic representation, a BN analysis model is proposed, on which we based a qualitative analysis. An illustrative example is given to show how to construct the BN model via experimental data. We also discuss the advantage of the proposed methodology, its feasibility and highlighting the future work remaining. (C) 2015 Elsevier Ltd. All rights reserved.
作者机构：
[Zhang Zhen-Hua] Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.;[Zhang Zhen-Hua; Lu, Gang] Univ South China, Cooperat Innovat Ctr Nucl Fuel Cycle Technol & Eq, Hengyang 421001, Peoples R China.;[Wei Ke-Wei; Lu, Gang] Henan Univ Technol, Coll Sci, Zhengzhou 450001, Peoples R China.;[Wei Ke-Wei] Anyang Normal Univ, Coll Phys & Elect Engn, Anyang 455002, Peoples R China.
通讯机构：
[Zhang Zhen-Hua] U;Univ South China, Sch Nucl Sci & Technol, Hengyang 421001, Peoples R China.
关键词：
X(3872);mass degeneracy;B meson
摘要：
The spin is an important property of a particle. Although it is unlikely, there is still a possibility that two particles with different spins share similar masses. In this paper, we propose a method to probe this kind of mass degeneracy of particles with different spins. We use the cascade decay B+→X(3872)K+, X(3872)→D+D- to illustrate our method. It can be seen that the possible mass degeneracy of X(3872) can lead to interesting behavior in the corresponding cascade decay.
