基于可接受间隙理论的交汇段次航道通过能力

为研究内河交汇段航道通过能力,分析了内河交汇段船舶流特性。讨论了可接受间隙理论在内河交汇段实行"分道通航"规则下分析应用的可行性。借鉴公路无信号交叉口通过能力计算方法建立交汇段航道通过能力计算模型。以长江尹公洲"十字型"交汇航段为例,在条件相同下计算比较交汇段航道、基本段航道和船闸三种航段的通过能力。比较结果表明:交汇段通过能力小于基本段通过能力,但大于船闸通过能力;为内河航道设计、交通运输规划等相关领域的人员提供参考。     

智慧航道建设与港航管理业务融合模式研究

伴随我国“一带一路”政策的落地,我国与其他国家衔接较为紧密,贸易量持续性增加,航道行业也面临新的机遇。为加速我国航运建设,国家促进内河航道高速发展,积极推行和落实航运信息化、自动化建设。智慧航道建设与港航管理业务融合模式研究化作为核心构成,更是智能船舶与信息化管理的前提。港航管理业务较多,为提高其工作效率,逐步引入多个先进的信息技术,打造智慧化航道建设与港航管理业务平台,实现多元化功能,促进港航业良好发展。该文通过信息技术与港航管理深层次的融合,尝试建立完善的融合模式,营造一体化管理环境,发挥管理者主导作用又凸显船户主体地位,发挥智慧航道建设的作用,促进港航业高效化发展。     

天津港大沽沙航道交通组织优化

为保障天津港大沽沙航道通航安全畅通,对该航道通航环境和交通现状进行了研究,统计分析了大沽口港区和南疆南港区泊位及到港船舶情况,通过分析通航时间和通航密度,计算了航道实际通航能力,指出该航道交通组织优化的必要性.依据港口发展规划,对港区货物吞吐量及到港船舶数量进行了预测,在此基础上提出了大沽沙航道交通组织优化模式和安全保障措施及建议.     

浅谈内河航道数字化建设的意义

进入21世纪、我国内河航道建设飞速发展,如何加强内河航道数字化、信息化建设是当前研究的热点和难点,该文通过对航道信息化系统结构进行介绍,对航道信息化综合平台进行分析,从而为内河航道信息化具体实现打下了基础;通过对航道信息化建设的意义进行了分析,加强了提高航运管理能效的信心。     

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。     

海上突发事件下的航道通航效率分析

为研究海上交通突发事件对港口航道通航效率的影响,以交通波理论为基础,结合港口航道船舶交通流特性,分析突发事件时航道内船舶的聚集和消散过程,建立海上交通突发事件时空影响模型。以厦门港超大型船舶进港单向通航为例,定量计算出单向通航时最大排队长度及阻塞时间,为海事主管部门在超大型船舶进港时制定相应措施提供理论参考依据。     

上海港集装箱内河集疏运网络优化

对上海的内河网络做了比较全面深入的分析研究.首先,把上海内河航运网简化成网络结构图,把比较关键的航道交汇点抽象成结点并分配相应的集装箱数;其次,结合“一环十射”规划综合分析航道运输能力,力图与实际情况相符合;最后,采用Dijkstra算法计算出各节点到目的港区的最短途径,分析计算结果与各河段的运输能力,修正运输途径以得出航运系统比较满意的内河运输集疏运网络方案.     

测量技术在内河航道养护工程中的应用

江苏省地处我国大陆东部沿海中心,位于著名的长江三角洲经济发达地区,同时也是全国内河水运最为发达的省份之一。它为内河航道的发展提供了广阔的空间,但对航道养护和管理提出了更高的要求。测量技术在内河航道养护工程施工中发挥着重要的作用,因此本文主要阐述了内河航道养护工程主要测量工作内容及测量仪器设备,并重点分析了测量技术要点,最后通过对新通扬运河航道疏浚工程的测量放样进行了分析。     

依靠科技进步再创天津港辉煌

天津港位于华北平原海河入海口,处于京津城市带和环渤海经济圈的交汇点,是环渤海中与华北、西北等内陆地区距离最短的港口,是首都北京和天津市的海上门户,也是亚欧大陆桥的起点之一,背靠三北,面向东亚。 天津港是中国最大的人工港,由海港和河港两部分组成,港区现有陆域面积37平方公里,港口陆域规划面积80平方公里,航道为10万吨级,15万吨级航道正在建设中。天津港     

内河电子航道图数据交换技术研究

基于内河电子航道图相关标准与规范,开展数据交换技术研究,通过数据交换模型建立、基础数据与过程数据分层、分类与编码设计,在统一的数据处理平台下实现数据交换过程,为内河电子航道图数据组织、交换与应用提供有效的方法和手段,促进内河航道空间数据资源共享与信息交换。     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-