合肥光源逐束团测量和横向反馈系统及初步反馈效果实验

合肥光源逐束团测量和横向反馈系统不仅可以完成合肥光源逐束团的横向振荡、流强测量、纵向振荡和常规反馈任务,同时还开发了对多束团储存环中指定束团的激励,以及形成单束团和不同数量的束团串等附加功能.介绍了该系统研制中所涉及的部分关键问题,如矢量运算模块的开发、梳状(notch)滤波器研制、数据处理程序的开发和应用,并给出了相空间重建、模式分析和带束流反馈实验的初步结果.     

合肥光源束测系统的最新研究进展

介绍了合肥光源束测系统的最新进展及其研究工作，包括200MeV直线加速器BPM系统的研制和测量，利用交流K调制的基于束流准直测量研究，基于对数比处理技术的同步光位置测量系统的研制以及数字束流位置处理器的应用研究．直线加速器BPM系统已安装，并做了在线的束流位置测量实验，给出了测量结果．在合肥光源储存环上利用双向固态继电器开关可以对32块四极铁进行交流K调制，采用数字锁相放大和插值快速傅立叶分析算法进行了基于束流准直的交流K调制测量实验和研究，给出了实验结果．利用高精度对数运算放大器LOG112研制了基于对数比处理技术的同步光位置测量系统，其性能优于常用的差比和处理技术．利用数字束流位置处理器Libera在合肥光源储存环上完成了工作点、相空间和横向振荡阻尼时间常数等的测量，并取得了很好的结果．     

合肥光源束测系统的最新研究进展

介绍了合肥光源束测系统的最新进展及其研究工作,包括200MeV直线加速器BPM系统的研制和测量,利用交流K调制的基于束流准直测量研究,基于对数比处理技术的同步光位置测量系统的研制以及数字束流位置处理器的应用研究.直线加速器BPM系统已安装,并做了在线的束流位置测量实验,给出了测量结果.在合肥光源储存环上利用双向固态继电器开关可以对32块四极铁进行交流K调制,采用数字锁相放大和插值快速傅立叶分析算法进行了基于束流准直的交流K调制测量实验和研究,给出了实验结果.利用高精度对数运算放大器LOG112研制了基于对数比处理技术的同步光位置测量系统,其性能优于常用的差比和处理技术.利用数字束流位置处理器Libera在合肥光源储存环上完成了工作点、相空间和横向振荡阻尼时间常数等的测量,并取得了很好的结果.     

合肥光源束流轨道慢反馈系统

束流轨道稳定性是同步辐射光源的重要性能指标．合肥光源束流轨道反馈系统在二期工程的改造中，根据慢反馈理论设计的硬件结构和控制软件，已具备了束流轨道校正的硬件条件．经在合肥光源储存环上实现束流轨道慢反馈校正的研究与实验工作，目前使合肥光源的全环垂直轨道的稳定性达到｜△y｜〈30μm，与国际同类机器的稳定性指标相当．     

NSRL二期工程中束流测量系统的改造

介绍了NSRL二期工程中束流测量系统的改造，包括DCCT测量系统、闭轨测量系统、基于束流准直系统、工作点测量系统、光位置测量系统和200MeV直线加速器能谱测量系统．这些测量系统为合肥光源的运行调试和机器研究提供了有效的手段．另外，还给出了这些系统的应用和测量结果．     

曲面切槽晶体单色器设计

讨论了曲面切槽单色器的工作原理，并依据合肥光源上的XAFS光学参数，设计加工出晶体的切槽曲面，测量了曲面的形位误差，进而分析了曲面加工、定位误差以及入射光的束宽对单色器分光性能的影响．在测量所得的加工误差下，考虑由于束流宽束给衍射性能造成的影响，计算了实际晶体相对于理想晶体的理论衍射效率．计算结果证明该晶体单色器完全适用于合肥光源的XAFS光晕系统．     

合肥光源束流轨道慢反馈系统

束流轨道稳定性是同步辐射光源的重要性能指标.合肥光源束流轨道反馈系统在二期工程的改造中,根据慢反馈理论设计的硬件结构和控制软件,已具备了束流轨道校正的硬件条件.经在合肥光源储存环上实现束流轨道慢反馈校正的研究与实验工作,目前使合肥光源的全环垂直轨道的稳定性达到|△y|＜30 μm,与国际同类机器的稳定性指标相当.     

光功率稳定LD驱动力敏传感器的研究

在论述了光驱动力敏传感器工作原理的基础上．提出了实用化的闭环振荡式的压电晶体测为光驱动方案．采用光反馈稳定的３ｍＷＬＤ做光源．光驱动距离这５００ｍ．微功耗为敏传感探头总功耗仅为０．２７５ｍＷ．文中介绍了这种新型传感器的设计思想和实现光驱动的几个关键技术问题．给出了测量力参数的实验曲线．     

低能电子储存环lattice设计

描述了一台低能电子储存环的lattice设计,包括线性光学参数设计和非线性动力学孔径优化.该储存环有两种运行模式,在低发射度模式下束流发射度接近软X射线衍射限制发射度,光源亮度远高于合肥光源,同时用于安装插入元件的直线节数目较多;在等时性模式下线性动量紧缩因子连续可调,能够较方便地调节束团长度.     

NSRL二期工程中储存环高频系统的改造

分析了合肥光源电子储存环原高频系统中存在的问题，详细介绍了高频发射机和功率传输系统的改进、新高频腔的研制和高频控制系统的完善，并给出了设计指标和测试结果．结果表明：技术参数达到和优于设计指标，能满足储存环的工作要托     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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