Propagators and Masses of Light Quarks

Based on Dyson-Schwinger equations in “rainbow” approximation, fully dressed confining quark propagator is obtained, and then the masses of light quarks (mu, md, and ms) are derived from the fully dressed confining quark propagator. At the same time, the local and non-local quark vacuum condensates as well as the quark-gluon mixed condensate are also predicted. Furthermore, the quark masses are also deduced from the Gell-Mann-Oakes-Renner relation and chiral perturbative theory. The results from different methods are consistent with each other.     

AMS在核物理与天体物理研究中的应用

加速器质谱学方法在核物理与天体物理研究中有重要应用.主要介绍了该方法在寻找泡利不相容原理的违背事例和超新星活动研究等工作中的应用. As an ultra high sensitive analyzing method, accelerator mass spectrometry is playing an important role in the studies of nuclear physics and astrophysics. In this article, accelerator mass spectrometry (AMS) applications in searching for violation of Pauli exclusion principle and study on supernovae are discussed as examples.     

Magnetic-Flux-Controlled Giant Fano Factor for Coherent Tunneling Through a Parallel Double-Quantum-Dot

We report our studies of zero-frequency shot noise in tunneling through a parallel-coupled quantum dot interferometer by employing number-resolved quantum rate equations. We show that the combination of quantum interference effect between two pathways and strong Coulomb repulsion could result in a giant Fano factor, which is controllable by tuning the enclosed magnetic flux.     

General Decoherence Suppression in Three-Level Atom in V- and Ξ-Configurations

In this paper, we present the decoupling bang-bang （BB） twin-born pulses to suppress the genera/deco- herence, both amplitude and phase decoherence, in a three-level atom in V- and Ξ-configurations. We give the exact sequence of periodic twinborn pulses in such systems.     

Perfect Biparticle Teleportation by Using Multi-particle Quantum Channel with Joint Measurement

In this paper, we reinvestigate the faithful quantum teleportation of an arbitrary two-qubit state by a multi-particle channel with multi-particle joint measurements. The relationship between multi-particle quantum channel and the multi-particle joint measurement bases has been found. In addition, we show how to construct the multi-particle joint measurement bases.     

第一届Batchelor 奖获得者Howard Stone教授研究工作简评

Howard Stone 是哈佛大学工程和应用数学Vicky Joseph教授,因为1998至2007年之间的出色研究成果获得ICTAM2008年度Batchelor Prize。Batchelor流体力学奖和Lodney Hill固体力学奖是国际理论与应用力学协会设立的两奖项,旨在表彰获奖者在过去十年内在其力学研究的分支中所取得的重要贡献。Stone教授是Batchelor 奖的第一位获奖人。Batchelor 奖评选委员会对Stone教授获奖的评价为:"Howard Stone 由于1998-2007十年间具有广度和深度的研究工作以及在流体力学方面广为公认的领导地位而获得承认。他特别地因以下的开创性研究工作而众所周知: 微尺度流体力学,包括对滑移边界条件的研究,混合控制,电渗流效应;泡沫流,特别是提出和验证了新的泡沫渗流通用方程;表面张力和表面效应;生物流体力学;胶体动力学。他具有设计和分析简单模型问题的非凡能力,并通过理论、计算和实验方法对这些模型问题进行研究,从而获得重要的基础认识和实际应用。"      

感光影像微结构分析仪的影像分析软件包研制

在感光影像微结构分析仪上研制出一套专用感光材料性能测试及影像质量评价专用分析测试软件包,使该分析仪具有一机多功能的特点,即能够同时对感光影像的多项性能指标进行分析测试.在测试过程中能自动进行数字采样,按编制好的程序计算,具有快速简便的优点.本文还对该软件包的设计思想、软件构成、测试方法、软件性能及测试结果作出详细介绍.     

育龄期妇女血清EFAs和NEFAs轮廓谱及其用于NTDs预防性营养干预研究

本文借助GC/MS代谢组学方法, 测定了育龄期妇女血清中酯化和非酯化脂肪酸轮廓谱, 并对营养干预前后育龄期妇女血清脂肪酸含量变化进行了研究. 按营养干预组(48例)和对照组(48例)分组, 测定了育龄期妇女血清中酯化脂肪酸(EFAs)和非酯化脂肪酸(NEFAs)的平均含量; 利用SIMCA-P软件对定量结果进行PLS-DA分析, 聚类结果良好. 基于定量结果, 指认了6种潜在营养生物标志物, 并由此初步探讨了这些潜在生物标志物的生理意义以及营养素干预对育龄期妇女血清脂肪酸含量的影响, 以及脂肪酸代谢变化可能对胚胎神经发育造成的影响.     

On Husimi Distribution for Systems with Continuous Spectrum

We propose a procedure to generalize the Husimi distribution to systems with continuous spectrum. We start examining a pioneering work, by Gazeau and Klauder, where the concept of coherent states for systems with discrete spectrum was extended to systems with continuous one. In the present article, we see the Husimi distribution as a representation of the density operator in terms of a basis of coherent states. There are other ways to obtain it, but we do not consider here. We specially discuss the problem of the continuous harmonic oscillator.     

参数振动系统响应的频谱成分及其分布规律

采用Sylvester理论和Fourier级数展开方法分别研究了参数振动系统自由响应和强迫响应的频谱特性(频谱成分及其分布规律),讨论了系统稳定性和阻尼对于频谱幅值的影响,并给出了系统外激励共振条件. 理论研究结果表明:由于参数激励作用使得系统响应具有多频特点,这些频谱成分与系统固有频率、参数激励频率和外激励频率具有密切联系,而且其在频域分布也呈现出一定的规律. 此外,参数振动系统具有多个外激励共振点,除了外激励频率等于系统固有频率将发生共振外,当外激励频率等于系统固有频率和参数激励频率的组合值时,同样将发生外激励共振现象.