我国港口铁矿石物流发展模式及优化建议

目前,90％以上的铁矿石国际贸易集中于海运贸易,而中国是世界上最大的铁矿石买家,60％以上都需要从国外进口,港口成为铁矿石进口的重要节点,因此,港口铁矿石物流链的建设对降低铁矿石运输的成本至关重要,而运用物联网技术提高服务质量是港口铁矿石物流未来发展的方向.文章简要总结了港口铁矿石物流的几种模式,分析了当前港口铁矿石物流发展存在的问题,并提出了相应的对策和建议.     

中国海上石油进口的安全风险及对策

我国作为最大的石油净进口国面临着巨大的能源缺口,过分依赖海运的进口方式以及途经地区复杂的地缘环境使得我国海上石油进口面临重重风险.本文通过分析2007年～2016年石油进口状况以及我国主要途径的各大石油运输节点数据,构建海上石油进口安全评价体系,从运输节点安全、来源地安全以及运输能力这三方面评估我国当前海上石油进口安全风险,可以看出我国海上石油进口面临着主要运输节点地缘环境严峻、来源地单一集中、国运与储备能力弱等问题.我国应该积极拓展稳定的海外石油新来源以及新航线,改善过于依赖海运的进口方式,修建或增加管道容量,削减沿途地区复杂地缘局势带来的负面影响,建立强大深蓝海军和海外基地保护海外航线畅通以及油轮在大洋自由航行,加强储备能力应对突发事件发生,从而提高我国进口石油安全性,保障社会经济平稳发展.     

国家安全视角港口基础设施保障能力评价

港口(本文中的港口均指沿海民用港口)作为连接陆与海战略通道的重要节点,在国家安全面临威胁时极可能被征用,其集疏能力与保障的时效性关乎国家安全军事行动的进程乃至成败.本研究定位于沿海港口应对领土与主权纠纷等特殊时期、特殊任务需求的运输保障能力评价.针对该领域缺少定量研究及需求分析的现状,笔者通过"需求与供给"的定量对比分析,从而明确国家安全视角的港口基础设施保障能力,综合特殊时期的任务需求、特殊的运输品类,以及对港口基础设施的特殊要求,设定了"供给-需求"双侧指标评价体系,确定了港口特殊评价内容,选定了评价指标,建立了"供给-需求"双侧指标评价模型,并以沿海4个区域港口作为案例开展实证研究,计算得到了各区域港口的大规模兵力投送能力指数、军民综合运输保障能力指数及疏港交通能力指数.通过比较分析,一方面验证了方法的有效可用性,另一方面确定了各区域港口基于国家安全的运输保障能力的短板.针对短板制定了相应的改进方案,局部改进后,北部区大规模兵力投送能力指数从0.444提升到了0.747;南部区该指数从0.368提升到了0.776,二者的军民综合运输保障能力指数调整后可接近最大值1.000,该方案的提出为下一步港口基于国家安全的规划建设提供决策依据.     

福建省海洋运输学科发展研究报告

深入分析福建省海洋运输学科发展现状及海洋运输需求,预测海洋运输发展趋势,阐述了福建省海洋运输学科的发展思路和目标,提出了如下发展对策：政府扶持,给福建航运业创造良好的发展环境;以项目带发展,走合作、规模发展的道路;做大海西三大港口,促进海运规模发展;进一步拓展闽台“三通”先试功能;优化港口陆路集疏运体系,建设内陆“无水港”;以市场需求为导向,加强人才培养。     

浅析秦皇岛港安全生产管理工作

秦皇岛港是我国北煤南运的枢纽港,年输出煤炭占全国煤炭输出总量的?50%?以上,在巩固煤炭运输基础上,正在下大力气发展矿石、集装箱等主要业务,逐步拓展海运煤炭交易市场、电子商务等其他产业,打造国际化港口品牌。但港口安全形势却不容乐观,今年来发生多起安全生产事故。文章从安全生产事故案例入手,对事故案例进行分析并做出对策和措施。     

进口原木运输的工艺技术

研究了进口原木运输工艺及其工程设备。将传统的港口码头陆上木材中转作业改在港口水上贮木工程中进行，加快原木卸船，提高港口吞吐能力。解决了进口原木运输工艺的技术瓶颈问题。     

基于复杂网络的全球海运网络鲁棒性研究

为研究全球集装箱海运网络鲁棒性,了解全球集装箱海运网络抗干扰能力,根据2015年全球最新10大集装箱班轮运输公司中的7家公司的航运数据构建了全球集装箱海运网络。运用复杂网络理论和方法测算其拓扑结构特征,设计随机干扰和蓄意攻击两种仿真系统,从连通鲁棒性和功能鲁棒性两个角度展开研究。仿真实验结果表明:全球集装箱海运网络针对随机干扰具有较强的鲁棒性,而在蓄意攻击下鲁棒性较差;不同港口对网络鲁棒性的影响差异较大,通过仿真分析分别得到了对全球集装箱海运网络连通鲁棒性和功能鲁棒性影响最大的10个港口,这些港口大多是亚洲港口,其中上海洋山港对全球海运网络连通鲁棒性和功能鲁棒性都具有较大的影响。研究结果可为全球集装箱海运网络重要港口的保护提供参考。     

海运交通经济带系统演化及平衡点研究

为研究海运通道与其沿海经济区域发展的相互作用关系和演化趋势,在交通经济带理论中拓展海运部分,以海运通道运输量和经济带陆向纵深为共生规模变量,建立海运交通经济带单方非独立共生演化的Logistic模型,以运输经济、烟羽模型、微积分等方法提出其变量作用系数的量化途径和形式,解决未知参数,实现交通运输和地理空间不同范畴、无法...     

中国LNG进口海上运输通道安全评价

建立安全评价指标体系,运用投影寻踪方法构建安全评价模型,通过基于实数编码的遗传算法求解,得到最优的投影方向及综合投影结果.评价结果表明,澳大利亚—大鹏及澳大利亚—唐山通道安全状况较好,其次为马来西亚—洋山、澳大利亚—珠海、澳大利亚—大连,而卡塔尔—如东、卡塔尔—天津、也门—洋山通道进口LNG海上运输的安全性较差.评价结果与现状相符,这为相关部门制订我国LNG进口海上运输安全保障措施提供了科学依据.     

全球集装箱海运航线网络关键港口识别

针对关键港口识别方法相对孤立、测度指标相对单一的现状,基于复杂网络理论,以海运航线网络中港口度、港口介数、接近度、集聚因数和港口流量为指标,运用主成分分析法,得出了海运航线网络中港口的综合排名。以排名比较靠前的港口为关键港口,并运用相关性分析对港口的综合排名进行验证。验证结果表明:关键港口的分布受腹地位置影响,在数量上,亚洲和欧洲居于主导地位,新加坡港口以绝对优势居于综合排名的首位,中国的上海港口和香港港口分别进入了前10位。     

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.     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has