柴电潜艇混合航行工作制仿真研究

建立了柴电潜艇动力系统各组成部分的“准稳态”数学模型，在实现了潜艇水下艇行过程和充电航行过程仿真的基础上，提出了采用仿真确定潜艇混合航行工作制的具体方法。     

现代常规动力潜艇动力系统计算机仿真

建立了动力系统各组成部分的“准稳态”仿真数学模型，对潜艇水下航行工况和充电航行工况分别进行了仿真计算，并与实际测量值进行了对比，结果表明该方法是有效的和实用的．     

现代常规动力潜艇动力系统计算机仿真

建立了动力系统各组成部分的“准稳态”仿真数学模型，对潜艇水下航行工况和充电航行工况分别进行了仿真计算，并与实际测量值进行了对比，结果表明该方法是有效的和实用的。     

常规潜艇水下电量消耗建模与仿真

为计算常规潜艇在水下航行时的电量消耗,制定混合航行工况预案,分别对蓄电池的放电特性、推进电机的耗电功率情况和辅机的耗电功率情况进行了建模。根据蓄电池的放电电流近似等于推进电机工作电流和辅机用电设备工作电流之和的关系,综合上述三个模型建立了常规潜艇水下电量消耗模型。仿真结果表明,利用该模型可准确预测常规潜艇在不同航行工况下的电量消耗情况,为指挥员正确制定航行计划提供了参考依据。     

基于多级层次结构的潜艇作战效能水下环境影响评估

为了评估水下环境对潜艇作战效能的影响,针对水下环境特征和潜艇作战效能属性,采用层次分析法构建潜艇综合效能评估模型的层次结构;用灰色关联方法进行潜艇的一级评估,得出航行安全、战术隐蔽和鱼雷攻击等3项效能指数;在一级评估基础上,采用模糊向量方法实行潜艇的二级评估,得出潜艇的综合作战效能指标.通过模型仿真实验,得到影响评估的量化结果.该结果基本反映了水下环境对潜艇作战的影响程度.     

基于神经网络的潜艇水面航向控制研究

针对水面航行的潜艇易受到风浪高频干扰而产生频繁操舵的问题,提出了采用直接模型参考的神经网络自适应控制方法.在潜艇航向的离线辨识中引入了参考模型,通过参考模型的输出和潜艇模型的实际输出的比较来调整RBF神经网络的权值,以达到潜艇水面航向的自适应控制,并且针对风浪干扰设计了切比雪夫II型滤波器.仿真结果表明:结合切比雪夫II型滤波算法和直接模型参考神经网络自适应控制算法,能够很好地解决潜艇航向控制在海浪干扰下的无效操舵问题.     

水下和海底大地坐标的精确测量

潜艇水下高精度定位，长期以来一直是水下导航定位领域的一个难题．为了解决潜艇在水下长时间航行过程中的高精度定位问题，提出了一种比较实用的解决方案．该方案构建了由DGPS定位和水声定位相结合的水下定位系统．系统采用系缆浮筏作为潜艇，利用DGPS进行水下定位的中继站，利用水声相对定位技术将：DGPS水面定位向水下延伸，使潜艇在工作潜深就可以直接获得自身的大地经纬度坐标．系统将DGPS的优良性能与超短基线在水下定位中的优势很好地结合在一起，其定位精度可以保证与DGPS水面定位精度在同一量级。     

基于OpenGL的某航行体水下运动可视化仿真

详细介绍了航行体水下航行可视化仿真的实现过程.利用OpenGL建立航行体的几何模型,并根据获取的数据资料控制三维动画的显示,在计算机上进行航行体水下航行的三维动画可视化仿真.     

附体对潜艇兴波尾迹的影响分析

基于RANS(雷诺时均)方程和Realizable k-ε湍流模型,采用Simple算法求解压力-速度耦合项,建立了求解水下潜体兴波阻力的数值模型,并对潜艇近水面航行时的兴波特征进行了模拟.首先进行了网格及时间步长的收敛性验证,并验证了本数值模型的准确性.接着计算了SUBOFF潜艇在裸艇工况下以不同潜深航行时的兴波阻力,并针对特定潜深研究了潜艇在不同附体工况下以不同航速航行时的兴波特性.研究表明:当潜艇在弗劳德数为0.5附近时,兴波阻力系数最大;当潜深接近1/2艇长时,兴波阻力系数接近0;当单独存在尾翼附体时,会产生较大的兴波,驾驶舱与尾翼附体同时存在则会减少该影响;潜艇表面形状的突变会产生较大的压力变化.     

低温漂便携式水平校正仪设计

为了给潜艇航行自动化提供可用信息，满足潜艇部分仪器工作平台实时水平校正的要求，利用NS45/P2数字输出双轴倾角传感器设计了一种便携式水平校正仪，并通过实验对倾角传感器零点温漂进行了补偿。实际应用表明，该水平校正仪转换线性好，工作稳定，可实时、准确的测量倾角。     

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.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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