内河航道三维动态监控系统架构

为提升内河航道管理水平,结合内河航道场景以及航道维护业务特点,运用虚拟现实技术,提出一种基于三维的内河航道动态监控系统架构,并研究一种4D数据与动态3D航道业务模型数据相结合的三维航道场景更新维护机制,在确保三维场景稳定前提下实时立体展现航道中船舶、航标动态以及水位变化对航道、河床的影响.实践证明,该架构以及相应的更新维护机制确实可行.     

三维仿真技术在航标管理中的应用

分析近年来国内外高新信息技术在航标领域的应用情况,并结合航标日常管养的实际业务需求,开展了基于三维实时仿真技术的航标管养研究工作.运用船舶操纵模拟器的三维视景仿真功能,开展了航标配布模拟检验应用研究工作.简要介绍了三维仿真技术在航标管理中的研究情况,从检验航标布设间距及航道转向点航标布设的应用层面,介绍了三维仿真技术在航标管理中的应用.     

浅析内河航标信息化管理

内河航标是船舶在内河安全航行的重要助航设施,为船舶航行指出安全、经济的航道.文章重点阐述"数字航标"在内河中设置的必要性和重要性.     

桥区航道船舶通过能力仿真

为合理分析计算桥区航道船舶通过能力,根据武汉长江大桥桥区航道船舶AIS数据及实测数据,分析船舶类型比例、船舶尺寸分布规律、船舶到达速度分布规律、船舶到达规律分布和船舶间时距等数据特征,利用VC编程生成仿真船舶交通流,并嵌入电子江图,实现数据的可视化输出.建立桥区航道船舶通过能力仿真模型,通过数据输出及分析处理,实现桥区航道船舶通过能力的分析计算,可为桥区航道规划设计及航道整治提供理论依据.     

桥区船舶交通流可视分析系统

以武汉长江大桥桥区水域为研究对象,针对数据分析能力不足而造成海量AIS(Automatic Identification System)数据不仅无法更好地助力水上交通安全,反而为监管决策带来困扰的现状,研究了多维AIS数据的可视化表达和人机交互方法.提出了以电子航道图为载体的内河船舶交通状态平行坐标图模型,并针对传统网格划分法的不足,采用高斯密度函数为核函数利用二维核密度估计法生成热力图模型.在此基础上研发了船舶交通可视化系统,通过3组实例证明该系统有助于桥区船舶数据的异常分析和船舶行为模式识别,为海事管理人员提供有效的决策依据.     

基于ArcSDE的内河电子航道图改正方法

为提高内河电子航道图数据更新的准确性和及时性,保证船舶航行安全.提出一种基于ArcSDE的内河电子航道图改正方法,利用ArcSDE可扩展关系数据库为空间可用数据库的特点,将内河电子航道图数据存储到空间数据库中进行处理.结果表明该方法提高了航道数据处理的效率.     

长江电子航道图制作的关键技术

为使长江(内河)电子航道图的生产、发布和社会服务符合国际标准,根据长江(内河)数据源特点,结合国际标准电子海图的发展模式,提出长江电子航道图的标准体系、制作机制,解决长江电子航道图制作过程中涉及的关键技术,确保长江电子航道图的生产和应用遵循国际相关标准,同时体现中国内河的地域特色以及行业特征.实践结果表明:该研究可有效解决中国内河电子航道图生产所涉及的技术问题,有效推动江海联运.     

基于船舶行为特征的港口航道通过能力仿真

为使港口航道通过能力的计算更符合港口航道的实际情况,分析了港口航道系统特征及船舶交通流特征,建立基于船舶行为特征的港口航道通过能力模型.定义船舶行为特征的有关概念,并根据国内某大型海港的历史资料进行模型仿真试验.结果表明,该模型能较好地模拟港口航道交通流的实际运行状况,对港口航道通过能力的计算、评估和预测具有重要的理论价值和实际意义.     

海港复式航道通过能力动态系统仿真

基于SIMIO仿真平台,建立天津港航道系统仿真模型.采用Google Sketchup软件创建港口3D模型图像,与SIMIO仿真结果结合,使模型具有直观三维视觉效果.运用天津港2004年统计资料验证了仿真模型的可靠性.对天津港2011年全年全港船舶到港资料分析、拟合发现,2011年天津港船舶到港规律符合泊松分布.以天津港2011年基础设施情况和营运状况为模型约束条件,通过三组仿真试验,对比了复式航道实施前后天津港营运状况,分析了两种情况下的变化及其原因;给出不计泊位数影响前提下,双向航道及复式航道的极限通过能力;探讨了港口服务水平、泊位等待时间、锚地等待时间及航道等待时间等因素随船流密度变化的趋向.     

刍议海河下游内河电子航道图系统建设的意义

随着内河水运信息化的发展,构建内河电子航道图系统是当前国内各航道管理部门研究的热点。通过对国内外研究现状介绍,梳理了海河下游内河电子航道图系统构建的框架和主要功能模块,为海河下游内河电子航道图系统建设打下基础;对未来建设面临的困难和机遇进行了分析,总结了项目建设的意义,为海河航道信息化打下坚实基础。     

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