航空货运产业关联性及临空产业体系构建研究

本文将从航空经济链条体系结构入手,运用投入产出法对航空货运业与各产业部门的关联性进行定量分析,构建以运输成本为主要影响因素的区位选择指标分析货运枢纽机场的产业带动机制。最后本文对目前我国航空货运业对国民经济的整体贡献进行评价,并提出通过航空货运业带动区域经济发展的政策建议。     

由两起操作性污染事故引发的关于液货船装卸作业安全的思考

随着我国对石油的需求不断增长,液货船舶数量不断增多,船舶操作性污染事故日益增多。文中试图分析两起发生在天津港的操作性污染事故产生的原因,浅谈目前液货船在装卸作业方面存在的安全问题,从而提出建议和对策,希望能在避免液货船操作性污染事故发生以及减少海洋环境损害方面起到积极的作用。     

我国机场货运规模体系评价及优化建议

新形势下,优化中国机场货运规模体系对中国民航高质量发展和民航强国建设具有重要现实意义。从总量规模、货运功能、整体优化水平的多视域角度可以对中国机场货运规模体系进行综合评价。分析表明:(1)目前,我国航空货运形成了"4+3+N"机场发展格局;(2)我国机场货运功能整体呈现"低水平、扁平化"发展态势;(3)我国机场货邮规模体系优化程度有待提高,与美国也存在一定发展差距。本文的政策涵义在于,中国机场货运规模体系优化要有系统性思维,结合当前发展新形势和新机遇,重点应在供需两侧、系统布局、改革协同三个维度进行顶层设计。     

岙山5#货运泊位设计特点

结合水文、地质等自然条件，介绍岙山5#泊位码头平面布置、结构选型和桩基设计的特点。     

基于载波移相控制的脉冲整流器直流侧支撑电容电压谐波抑制研究

以电力牵引交流传动系统中两重化脉冲整流器拓扑为研究对象,以实现其直流侧支撑电容电压谐波抑制为目标,首先从理论上分析了直流侧支撑电容容量的设计方法;然后分析了稳态运行时直流侧电压高次谐波的产生机理,并重点分析了两重化脉冲整流器载波移相控制方法对直流侧脉动的影响.理论分析表明直流侧电压高次纹波主要分布在2倍开关频率附近,载波移相控制技术可以有效地抑制直流侧2倍开关频率附近的纹波电压,从而减小直流侧电压纹波系数.因此在传统直流侧支撑电容容量设计方法的基础上,加入载波移相控制可以进一步减小所设计的支撑电容大小.最后对未添加载波移相控制和添加载波移相控制的方法分别进行了计算机仿真和半实物试验测试.Matlab仿真和dSPACE半实物测试结果都验证了理论分析的正确性和有效性.     

航母飞行作业空间安全布局研究

研究针对航空母舰飞行作业空间安全问题而开展。研究首先根据作业特点划分航母作业区域，针对飞行作业分析构成空间危害因素的来源，提出一套度量危险因素的空间关联安全水平指标，以便对危险因素的空间关系进行量化；然后在此基础上，对2套不同起飞作业布局进行安全评价；最后，并围绕航母飞行甲板作业空间安全的典型问题进行分析和讨论。     

Time-variant bulk carrier reliability analysis in pure bending intact and damage conditions

Time-variant reliability analysis of a corroded bulk carrier in intact and damage conditions is performed by First-Order (FORM), Second-Order (SORM) Reliability Methods and Importance Sampling simulation. Annual failure probabilities are determined up to 25-year ship lifetime, accounting for time-variant corrosion wastage of structural members contributing to hull girder strength. Statistical properties of hull girder capacity are determined by Monte Carlo simulation, applying three correlation models among corrosion wastages of structural members contributing to hull girder strength, namely no correlation, full correlation and full correlation among wastages of structural members belonging to the same category of compartments. A modified incremental-iterative method is applied, to account for instantaneous neutral axis rotation, in case of asymmetrical damage conditions, as for collision and grounding events. Incidence of intact/damage condition, as well as correlation among corrosion wastages, on annual sagging/hogging time-variant failure probability is investigated and discussed. Time-variant sensitivity analyses for intact and damage conditions are also performed, to investigate the incidence of random variables' uncertainties on the attained failure probability. Finally, the bulk carrier section scheme, benchmarked in the last ISSC Report, is applied as test case.     

Empirical estimation of price and income elasticities of air cargo demand: The case of Hong Kong

This paper estimates the price and income elasticities of air cargo demand and examines how they may change after the 2008 financial crisis. Using a set of time series data, we simultaneously estimate the aggregated demand and supply functions of air cargo at Hong Kong International Airport (HKIA). We find that during the entire sampling period of 2001–2013, the price elasticity for air cargo transport demand at HKIA ranges from −0.74 to −0.29, suggesting that air cargo demand in Hong Kong reacts negatively to price (as expected) but does not appear to be very sensitive to price. The income elasticity ranges from 0.29 to 1.47 and appears sensitive to seasonality adjustment approaches. However, in terms of the speed of changes, air cargo demand changes much faster than overall economy, indicating the presence of a pro-cyclical pattern of air cargo traffic with respect to the overall economy. Our analysis shows that air cargo demand becomes more sensitive to changes in both price and income after 2008.     

关于木材运输船安全运输的几点分析

木材船海上运输具有一定的风险,一旦积载和绑扎不当或管理不妥,造成货物滚动、移位、货垛倒塌,就会引发安全事故甚至导致船舶倾覆。因此,加强木材船的安全管理,落实各项安全保障措施,是确保木材船安全运输生产的重要举措。     

6000DWT沥青船液货梯级加热系统设计

提出一种利用船舶主机余热的沥青船液货梯级加热系统,包括四个加热回路,即缸套冷却水余热提取环路、废气热油锅炉环路、燃油热油锅炉环路、沥青加热环路和相应的控制装置。该加热系统可以实现船舶主机缸套冷却水余热、废气余热的梯级利用。经过经济性计算,该系统可节省燃料60%以上,十二个航程便可收回增加的设备投资,节能效果明显。