图像技术在飞行模拟器中的应用研究

利用图形技术实现了飞行模拟器,该系统可以模拟多个飞行目标。飞行目标的模拟是根据假设的需求,生成目标飞行航迹。系统利用Bresenham直线算法实现飞机坐标点的计算,利用双缓冲技术来实现飞机图像的显示,并且解决了飞机任意转角度等问题。     

战术飞行机动动作仿真设计与实现

针对数据链飞机模拟器中飞行平台轨迹的终端实时显示问题,以飞机动力学运动方程为基础,构建了盘旋机动和斤斗机动过程的轨迹方程,并给出了机动动作设计的一般流程。通过建立基于时间戳的自适应交互多模(AIMM)时延补偿模型,使飞机动作显示与实际作战网络负载下的飞机状态保持同步。最后设定2种机动动作场景,对飞行机动轨迹予以演示，验证了所设计的可视化平台能有效模拟飞机进行盘旋和斤斗机动,实现了地面指挥所对模拟飞机飞行状态的实时监视,为空战仿真模拟训练奠定基础。     

基于ADS-B空管模拟培训系统研究

广播式自动相关监视系统(Automatic Dependent Surveillance Broadcast,ADS-B)不仅成功应用于无雷达地区的远程航空器运行监视,且对于空中的高密度服务有广泛的应用前景.在对ADS-B技术的推广应用过程中,需要对空中交通管制员进行基于该系统的模拟培训,从而保证该系统安全高效地工作.该研究利用计算机仿真技术解决ADS-B空管模拟培训系统软件上的几个关键问题,较好地实现了飞机加入各种飞行程序的模拟仿真,并实现了通过鼠标和键盘对飞机的高度、航向、速度等参数的实时调整功能,模拟实现管制指挥过程.     

基于飞行计划集中处理的多航空器无冲突航迹规划

为增大空域容量,提高飞行安全,降低管制员的工作负荷,4D航迹预测与规划是国内新一代空管自动化系统中最为重要地一项核心技术。首先在预战术流量管理阶段,通过飞行计划集中处理得到的航空器飞行计划信息,将航线划分成若干航段。然后利用航空器在不同航段间的离散型模型和单个航段中运动的连续型模型建立混杂模型,通过全飞行剖面混杂模型进行航迹预测;在相对运动法中采用调整速度来规避航路交叉点冲突以实现冲突解脱。最后提出航迹规划方法并对航空器进行无冲突航迹规划。仿真算例表明：在飞行计划集中处理与混杂模型下预测的水平航迹与垂直航迹能够准确地反映航空器飞行状态变化;调速法或调整时刻能有效地规避飞行冲突,所以提出的无冲突4D航迹规划方法是切实可行的。     

基于北斗导航的通航航迹引导与管理系统研究

提出基于北斗导航的通航飞行航迹引导系统设计方案,方案设计使用北斗作为导航源、系统建立自己的导航数据库系统、并生成通航飞行计划航路航迹、使用北斗系统进行定位引导、根据我国空域要求制定偏航边界告警门限等方法构成一个可运用的导航监管系统.对实现北斗在我国航空运行中的实际应用,提高通航目视条件下的飞行安全具有极大意义.     

相控阵雷达仿真中的航迹关联算法研究

随着计算机计算的迅猛发展,仿真技术得到了越来越多的应用。本文主要介绍了在相控阵雷达仿真中的航迹关联算法的实现,包括关联门的选择,关联算法及航迹管理流程等。文中的航迹关联算法对于在仿真中准确模拟相控阵雷达系统的功能有重要意义。     

基于航迹特征的飞行程序噪声预测研究

针对目前飞行程序减噪设计的需要,研究了民机的航迹特征,选取了声暴露级（SEL）作为单个事件的飞机噪声评价指标,并在研究飞行程序特点的基础上,结合飞机噪声性能（ANP）数据库和NPD噪声计算方法,建立了一套基于航迹特征的离场飞行程序噪声预测方法。以某民用机场的离场程序为例,绘制出噪声等值线图,验证了方法的可行性。实例证明,该方法可以量化预测飞行程序的噪声影响,规范了飞行程序噪声预测的方法,可以为减噪飞行程序设计提供参考。     

基于支持向量机的雷达电子支援措施系统点迹-航迹关联算法

概率数据关联是多源信息融合算法中的关键问题,本文主要对基于雷达和电子支援措施(ESM)双传感器融合的数据关联问题展开研究.由于雷达和ESM传感器方位角数据分布近似相同,可以通过对ESM数据的分析得到判别函数,使用相应的判决规则对点迹和航迹进行关联,这本质上可以看作是一个模式识别问题.本文考虑到支持向量机(SVM)模型在模式分类中的良好表现,建立了基于SVM的雷达ESM系统的点迹-航迹关联模型,使用ESM传感器航迹数据训练SVM模型,对雷达点迹数据进行分类,获得关联结果.最终模拟结果表明:与经典的多假设跟踪算法相比,所提出的算法可有效提高关联准确率.     

舰载机进场动力补偿系统设计

舰载机事故主要发生在着舰过程,而其主要原因是由于舰载机低速着舰时航迹控制不稳定引起的,进场动力补偿系统就是为了解决这一不稳定现象而产生的推力自动控制系统。为了克服舰载机低速不稳定问题,提高航迹控制精度,并减轻飞行员在着舰阶段的工作负荷,飞机系统中需要引入速度恒定进场动力补偿系统。采用 F/A－18A 舰载机参数建立舰载机纵向运动小扰动线性化模型,分析模型飞行品质,并引入飞机姿态控制系统来解决俯仰控制不稳定的现象并使飞机满足一级飞行品质,之后采用衰减曲线法设计 PID 参数完成对速度恒定进场动力补偿系统的设计,解决航迹角无法跟踪俯仰角这一航迹控制不稳定问题,最后又引入舰尾流的垂直稳态分量验证了系统的抗扰动能力。     

基于灰色关联分析的异类传感器航迹相关算法

针对由雷达和红外传感器组成的异类传感器数据融合系统中的多目标航迹相关问题,提出了基于灰色关联分析的异类传感器航迹相关算法.该算法将目标航迹看成是方位信息的时间序列,所有目标航迹构成方位时间序列集合,利用B型关联度对该集合元素进行灰色关联分析,形成航迹灰色关联度矩阵,采用最低关联度门限与全局最优的策略确定航迹关联对,实现...     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to