基于分形的地形分类技术及其在导航中的应用

将ｆＢｍ模型引入地形分析中，通过ｆＢｍ模型的参数Ｈ和σ来描述地形的复杂度和起伏程度，以此特征来实现对地形的分类，仿真实验证实了在地形辅助导航中，以Ｈ和σ作为地形的特征参数，可以区别不同种类地形对地形辅助导航的影响，为航迹规划和飞行走廊地形的选取提供了依据和准则。     

B3H7和B3H9分子中多中心键的研究

用Ｄｕｎｎｉｎｇ基进行从头计算的结果表明：在Ｂ＿３Ｈ＿７（１１０３）中氢桥三中心键与ＢＢＢ三中心键已用σ－共轭效应“融合”为１个四中心键，其特性为ｆ＿Ｂ１－Ｂ２＝１３．６１６２ｎＪ／ｍ，ｆ＿Ｂ２－Ｂ３＝１１．７７１１ｎＪ／ｍ，ｆ＿Ｂ－Ｈｂ－Ｂ＝２８．１３８６ｎＪ／ｍ，ｆ＿４ｃｅｎｔｅｒ＝５８．７０７１ｎＪ／ｍ。但在Ｂ＿３Ｈ＿９中３个氢桥三中心键不相互作用，保持独立，其特征为ｆ＿Ｂ－Ｂ＝４．５９６４ｎＪ／ｍ，ｆ＿Ｂ－Ｈｂ－Ｂ＝３２．３０６６ｎＪ／ｍ，ｆ＿Ｈｂ３ｃｅｎ＝４２．１３３７ｎＪ／ｍ。     

水下地形匹配导航研究综述

地形辅助导航系统以地形高程特征为定位信息源,可为水下航行器提供有界的定位误差,并能显著地抑制捷联惯性导航系统的误差漂移。而地形匹配算法是地形辅助导航系统的关键技术,其输出的匹配位置可作为组合导航滤波器的观测值以修正导航参数,地形匹配精度直接决定了整个导航系统性能。本文首先概述了现有水下导航定位技术,然后阐述了地形辅助导航基本原理与组成,最后详细总结了国内外地形辅助导航系统和地形匹配算法的研究进展,为我国地形辅助导航系统的开发和研制提供有益参考和支撑。     

基于自适应分形内插的数字地面重建

模拟在测绘过程中被忽略的地形细节对逼真地形重建来说是十分重要的。本文提出了一种基于从原始观测数据提取的分形特征的快速自适应分形内插方法。所介绍的内插模型是对ｆＢｍ的一个局部稳态的近似，由此产生的几何纹理细节不论在视觉上还是在精度上都更接近真实地形。     

整函数与基样条的关系

主要结果是：对ｆ∈Ｌ２（Ｒ），有ｌｉｍＥ（ｆ，π／σ，ｍ∩Ｌ２（Ｒ））２（Ｒ）＝Ｅ（ｆ，σ∩Ｌ２（Ｒ））２（Ｒ），且存在ｆ０∈Ｌ∞（Ｒ），使得ｌｉｎＥ（ｆ０，π／σ，ｍ∩Ｌ∞（Ｒ））∞（Ｒ）＞Ｅ（ｆ０，σ∩Ｌ∞（Ｒ））∞（Ｒ），其中π／σ，ｍ为ｍ－１次的以｛（１／２）ｊπσ－１（ｍ＋１）｝ｊ∈Ｚ为节点的基样条的全体，σ表示指数σ型的整函数在Ｒ的限制的全体，其中σ＞０。     

Banach空间值鞅的两种新型BMO空间和Sharp算子

借助于ｐ－条件均方算子和ｐ－均方算子,首先引入了Ｂａｎａｃｈ空间值鞅的两种新型ＢＭＯ空间ＢＭＯ＾σ（ｐ）（Ｘ）和ＢＭＯ＾Ｓ（ｐ）ｒ（Ｘ）以及两种新型ｓｈａｒｐ算子ｆ＾σ（ｐ）ｒ和ｆ＾ｓ（ｐ）ｒ,并且讨论了ＢＭＯ＾σ（ｐ）ｐ（Ｘ）与ＢＭＯ＾＋ｐ（Ｘ）,ＢＭＯ＾ｓ（ｐ）ｐ（Ｘ）与ＢＭＯｐ（Ｘ）的相互嵌入关系,以及ｆ＾σｐｐ与ｆ＾＃ｐ,ｆ＾ｓ（ｐ）ｐ与ｆ＾＃ｐ之间的凸Φ不等式,所得结果给出了Ｂａａｎｃｈ     

井间地层分形描述

用线性插值和分形插值方法建立了井间参数精细剖面模型。在相同的井点值下，修改随机数发生器的种子值，完成分形随机模拟的多次实现，然后用黑油模拟器对不同剖面模型进行动态模拟。对生成的精细剖面图进行了对比，结果表明，分形随机建模能同时考虑地层参数分布的结构性和间歇性，而分数高斯噪声（ｆＧｎ） 比分数布朗运动（ｆＢｍ） 更适合描述沉积环境变化剧烈、随机干扰强的地层。用多次实现的分形随机模型进行动态预测，对开发指标可给出最好、最坏和最可能的估计。间歇指数对ｆＧｎ 法所建模型的动态预测结果影响较大，对ｆＢｍ 影响较小， 在两端注、采井工作制度相同的情况下，用不同的间歇指数建立的ｆＢｍ 分形剖面模型的最终采收率基本不变     

卡尔曼滤波地形辅助导航防止发散问题研究

对卡尔曼滤波地形辅助导航的发散原因作了分析,通过地形拟合误差的去相关法采用一种扩充状态变量的系统,实验证明此系统能够有效地减少发散的发生     

噪声背景下fBm的小波分析及H参数的估计

分析了在加性白噪声背景下ｆＢｍ的小波系数的二阶统计特性，得出了同一尺度上小波系数序列的平稳性结论，同时分析了噪声对Ｈ值的影响，并提出了一种根据小波系数估计Ｈ值的改进算法．实验表明，该算法能有效地抑制噪声的影响，估计出原信号的Ｈ值来     

基于Unscented卡尔曼滤波算法在海底地形辅助导航中的应用

为了解决SITAN海底地形辅助导航算法将非线性过程线性化,容易产生不稳定甚至滤波发散的问题,提出了一种基于Unscented卡尔曼滤波的海底地形辅助导航算法,该算法无需对非线性系统的状态方程和观测方程进行线性化,直接采用UT变换(unscented transform,UT)近似非线性函数的概率密度分布,并求取变换后的点集的均值和方差。利用海底地形SEAMAPnew Hill100为真实海底地形数据对算法进行了测试。实验结果表明,该算法较传统算法有较强的精确性和鲁棒性。     

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.     

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