光纤陀螺的温度试验及温度补偿方法研究

分析了引起光纤陀螺非互易性效应的原因，针对光纤陀螺光、电路部分各自的特性对光纤陀螺整体温度特性的影响进行了高低温试验研究，并对温度试验结果进行了分析，试验结果证明了对光纤陀螺温度特性的理论分析．在试验研究的基础上给出了实施的温度补偿方案及补偿结果，并对补偿结果进行了分析．     

基于DSP的开环光纤陀螺的原理及其关键技术

介绍了基于DSP技术的开环光纤陀螺.开环光纤陀螺以Sagnac效应为基础,是一种新型的全固态陀螺仪,由于其具有潜在的良好的性价比,与数字信号处理芯片DSP接口简单等优点而倍受青睐,一经出现就受到世界各国的高度重视,已经成为新一代中低精度制导系统、国防装备中的理想惯性器件.     

光纤陀螺的研究现状及发展趋势

综述了光纤陀螺的最新进展,并着重介绍了中、低性能干涉式光纤陀螺（Ｉ－ＦＯＧ）的应用情况和高性能Ｉ－ＦＯＧ、谐振腔光纤陀螺（Ｒ－ＦＯＧ）以及布里渊光纤陀螺（Ｂ－ＦＯＧ）的研究状况．     

SLD光源谱型对光纤陀螺精度的影响

光纤陀螺仪的精度受到Sagnac相位差测量精度的限制,因此,减小相位差测量误差至关重要。通过相干函数,研究了SLD光源光谱形状及其纹波对光纤陀螺仪精度的影响,并结合实际情况进行了验证,最后给出了光纤陀螺对光源光谱的要求以及光源确定情况下陀螺的设计方向。     

基于TMS320F2812的IFOG信号检测方法研究及实现

高精度光纤陀螺是导航与制导系统的主要组成部分．采用基于数字信号调制解调技术对光纤陀螺进行闭环控制可以有效地提高光纤陀螺的精度．对光纤陀螺原理及信号检测方法进行了大量的研究和实验，以高速数字信号处理芯片TMS320F2812为基础，研制成功了基于阶梯波调制技术的闭环光纤陀螺全数字式信号检测系统，并给出了性能及测试结果．     

基于USB的光纤陀螺数据采集

光纤陀螺的研发过程中，原始数据实时采集对捷联算法的仿真及标定有重要意义．根据光纤陀螺数据采集特点，利用USB接口简单灵活，扩展性强且有较高的数据传输率的能力，设计了采用USB接口实现原始数据实时采集的系统．对整个系统的结构和USB接口的软硬件做了详细介绍．结果证明其8Mbit／s的传输速度很好地满足了系统需要．     

闭环光纤陀螺数字信号处理的设计方案

详细介绍了光纤陀螺的工作原理，并在TI公司16位高速数字信号处理器(DSP)TMS320VC5402的基础上，对闭环光纤陀螺的数据采集、数据处理进行了设计和实现．将混沌系统和互相关原理相结合，通过更加有效的软件算法，实现了提取掩埋于噪声中的微弱信号的提取和优化．     

光纤陀螺中的相位差与谐振频率差的推导及理论分析

光纤陀螺是一种基于Sagnac效应的环形干涉仪,常见的光纤陀螺包括干涉型和谐振型。首先,对于这2种光纤陀螺,本文采用了以惯性空间为参考系的路程叠加法证明了Sagnac效应是一种与介质无关的纯空间延迟,有效折射率n对Sagnac时间差Δt和光程差Δδ均没有影响;其次,对于干涉型光纤陀螺,有效折射率n对Sagnac相移差Δφ也没有影响;再次,对于谐振型光纤陀螺,文中提出了2种方法,即基于激光物理学中的行波谐振腔理论和基于多光束干涉机理,求出谐振环形腔的谐振频率差Δνq的表达式,其与光纤环匝数N无关。最后,得出光纤陀螺中的相位差Δφ和谐振频率差Δνq之间所满足的关系,并分别从数学形式和物理意义上对这一关系作出分析。2种陀螺的光路结构虽不同,但可使用统一的模型表达及分析光学物理量之间的关系。     

动态偏置干涉型光纤陀螺温度噪声的研究

从理论上分析了动态偏置干涉型光纤陀螺的温度噪声．在此基础上，进一步研究了调制频率对温度噪声的影响．最后给出抑制这种噪声的有效方法．     

光纤陀螺温度漂移自适应建模研究

针对光纤陀螺温度漂移模型参数随环境温度或陀螺本身工作状态的不同产生缓慢变化的现象，通过自适应建模的方法，自动修正模型参数，准确揭示了陀螺温度漂移特性．     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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