钨偏滤器的单元结构设计以及相关实验研究

主要针对偏滤器的单元结构进行了设计,重点研究了靶板表面结构的尺寸以及偏滤器靶板和拱顶两种水冷结构的几何参数、流动参数等对偏滤器结构和性能的影响。在此基础上,确定偏滤器单元结构设计和优化的指导原则,并针对偏滤器靶板和拱顶的水冷结构进行了高热负荷的热工水力试验,对偏滤器冷却结构的换热性能进行试验评估。最后,对偏滤器单元在热载荷、电磁载荷和机械载荷共同作用下的结构应力和安全性进行分析。     

Stability of concentration-related self-interstitial atoms in fusion material tungsten

Based on the density functional theory, we calculated the structures of the two main possible self-interstitial atoms(SIAs) as well as the migration energy of tungsten(W) atoms. It was found that the difference of the 110 and 111 formation energies is 0.05–0.3 e V. Further analysis indicated that the stability of SIAs is closely related to the concentration of the defect. When the concentration of the point defect is high, 110 SIAs are more likely to exist, 111 SIAs are the opposite. In addition, the vacancy migration probability and self-recovery zones for these SIAs were researched by making a detailed comparison. The calculation provided a new viewpoint about the stability of point defects for selfinterstitial configurations and would benefit the understanding of the control mechanism of defect behavior for this novel fusion material.     

Distillability sudden death in a two qutrit systems under a thermal reservoir

The dynamics of distillability entanglement between qutrit-qutrit systems interacting with a thermal reservoir is investigated in this paper.We discovered an interesting phenomenon that under a thermal reservoir certain initially prepared free-entangled states become bound-entangled states in a finite time,which is called distillability sudden death(DSD).We use a realignment criterion to measure the nine-dimensional density matrix of the entanglement.Moreover,we analyze some other parameters to investigate the effects to the systems.Explanations are then given.     

一个在BaBar、BES和Belle实验上发现的新强子(英文)

BaBar合作组在 e+e-→f0(980) 衰变道的 f0(980) 不变质量谱上发现了一个新强子态Y(2175)。 随后, BES和Belle实验都相继证实了这一发现。 与此同时, 理论家们也对Y(2175)的内部性质进行了大量的研究。 本工作对目前Y(2175)在实验和理论上的进展进行了详细的评述。同时,讨论了在f0(980) 不变质量谱中的2175 MeV以上能区寻找其它增长结构的可能性。Since the BaBar Collaboration announced a new hadron Y(2175) observed in the f0(980) invariant mass spectrum of e+e-→ f0(980), both BES and Belle confirmed BaBar’s observation. Meanwhile, the theorist also carries out the study to reveal the underlying properties of Y(2175). In this review paper, we give a detailed review of the present experimental and theoretical statues of Y(2175). In terms of the published experimental data of Y(2175), we also discuss the possibility of searching for other enhancement structuresafter 2175 MeV in the f0(980) invariant mass spectrum.     

Generation of motional cat states for a trapped ion in a cavity

Beyond the Lamb－Dicke limit, we propose a simple scheme for generating Schr?dinger cat states of the motion of a trapped two-level ion interacting with a quantized light field in a single-mode cavity.     

Dynamics of quantum discord in a two-qubit system under classical noise

We study the quantum discord dynamics of two noninteracting qubits that are, respectively, subject to classical noise. The results show that the dynamics of quantum discord are dependent on both the coupling between the qubits and classical noise, and the average switching rate of the classical noise. In the weak-coupling Markovian region, quantum discord exhibits exponent decay without revival, and can be well protected by increasing the average classical noise switching rate. While in the strong-coupling non-Markovian region, quantum discord reveals slowly decayed oscillations with quick revival by decreasing the average switching rate of the classical noise. Thus, our results provide a new method of protecting quantum discord in a two-qubit system by controlling the coupling between the qubits and classical noise, and the average switching rate of the classical noise.     

Determination of Atomic Number Densities of ^87Rb and ^3He Based on Absorption Spectroscopy

The atomic number densities of ^87 Rb vapor and surrounding gas 3He in a sealed cubic cell were measured by sweeping the absorption line and fitting the experimental data with a Lorentzian profile. The absorption was carried out around the D1 transition at different temperatures. We compare our results for the number density for^87 Rb with the previous methods and calculate the fractional error to be less than 5% as well as the error for ^3He between this work and the density obtained from the filling procedure to be no more than 4.2% at 370K. In addition, we discuss the factors that contribute to the error, among which the cell temperature plays the most important role.     

基于FPGA的光纤陀螺自适应LMS滤波算法研究

光纤陀螺仪的精度严重制约着以其为核心的惯性导航系统精度,为进一步提高系统精度须对光纤陀螺进行滤波处理。本文在自适应LMS滤波算法的基础上,以FPGA实现光纤陀螺数据的采集和滤波处理。以光纤陀螺的延时信号作为参考值,实时自适应调整陀螺不同时刻输出的权值来实现对噪声的滤除。在FPGA中,利用有限状态机的方式来完成该滤波算法的实现,同时完成权值系数的更新和信号采集等模块的功能。结果表明,经过FPGA采集并滤波后的光纤陀螺信号中的噪声分量明显降低,滤波延时远小于采样周期,完全满足工程实际需要。     

Oddball Y（4140） as the molecular cousin of Y（3930）

In my talk,we present the dynamical study of Y（4140） and Y（3930） under the D＊s D＊s and D＊ D＊ molecular assignments respectively.The importance to theoretically and experimentally study their open-charm decay,hidden-charm decay,radiative decay and double-photon decay is proposed combing with the theoretical calculation of the decay behavior of Y（4140） and Y（3930）.According to the recent new experimental progress made by Belle,we further indicate the reasonability of molecular explanation to Y（4140）.Another event cluster around 4270 MeV in the J/ψφ invariant mass spectrum of B → KJ/ψφ can provide us more hints to reveal the creation mechanism of molecular structure in B meson decay,which will be helpful to clarify the underlying structure of Y（4140） and Y（3930）.     

Efficient scheme for teleportation of an unknown N-atom state via a two-atom entangled state without the Bell-state measurement in cavity QED

We propose a scheme for teleportation of an unknown N-atom state using a two-atom entangled state within a cavity QED and show the feasibility in experiment. Our scheme does not involve the Bell-state measurement and is insensitive to the cavity decay, which is important from the experimental point of view. Another feature of the scheme is that teleporting a N-atom state just requires a small amount of entanglement （i,e. a two-atom entangled state） and less classical bits （two bits）.