Analysis of a proposed mechanism for carbon-neutral growth in international aviation

In October 2013, the International Civil Aviation Organization (ICAO) announced that it would put in place a market-based mechanism to cap net greenhouse gas emissions from international civil aviation at 2020 levels. This paper analyses the obligations that would be placed on real airlines under an initial draft “Strawman” proposal that was originally formulated as a starting point for discussions within ICAO, and the extent to which such a proposal would succeed in keeping emissions at or below the desired level. The provisions of the ICAO proposal were then applied to more than 100 existing airlines. In order to protect commercial sensitivities, we used hierarchical cluster analysis to identify groups of different types of airlines. We report the results for these groups rather than for individual airlines. While ambiguities in the Strawman proposal complicated the analysis, we found that, depending on their size and rate of growth, airlines will be required to offset very different proportions of their emissions from international flights. A system of de minimis exemptions, as currently proposed, would benefit some rich countries as well as poor ones. Targeting such exemptions more narrowly would raise practical difficulties, which we describe. We conclude by recommending that ICAO design and implement a much simpler system; and propose one alternative.     

Estimation of cost and CO2 emissions with a sustainable cross-border supply chain in the automobile industry: A case study of Thailand and neighboring countries

CO₂ emissions are increasing because of the growth in the cross-border supply chain, which is leading the locations of assembly plants and suppliers to spread across a wider area. Given that one passenger vehicle needs more than 20,000 components and parts, the automobile industry exploits the cross-border supply chain. Recently, the free cross-border movement of people, goods, capital, and information has accelerated in Asia. Therefore, a sustainable cross-border supply chain is required to reduce both CO₂ emissions and cost. This study estimates total CO₂ emissions per vehicle including production and transportation processes in Thailand and neighboring countries and the change in CO₂ emissions based on future policy scenarios that consider the automobile market and locational conditions in 2030. The results show that locating production close to the place of consumption and the electricity emissions factors in each country should be considered.     

Discovering themes and trends in transportation research using topic modeling

Transportation research is a key area in both science and engineering. In this paper, we present an empirical analysis of 17,163 articles published in 22 leading transportation journals from 1990 to 2015. We apply a latent Dirichlet allocation (LDA) model on article abstracts to infer 50 key topics. We show that those characterized topics are both representative and meaningful, mostly corresponding to established sub-fields in transportation research. These identified fields reveal a research landscape for transportation. Based on the results of LDA, we quantify the similarity of journals and countries/regions in terms of their aggregated topic distributions. By measuring the variation of topic distributions over time, we find some general research trends, such as topics on sustainability, travel behavior and non-motorized mobility are becoming increasingly popular over time. We also carry out this temporal analysis for each journal, observing a high degree of consistency for most journals. However, some interesting anomaly, such as special issues on particular topics, are detected from temporal variation as well. By quantifying the temporal trends at the country/region level, we find that countries/regions display clearly distinguishable patterns, suggesting that research communities in different regions tend to focus on different sub-fields. Our results could benefit different parties in the academic community—including researchers, journal editors and funding agencies—in terms of identifying promising research topics/projects, seeking for candidate journals for a submission, and realigning focus for journal development.     

发展我国铁路冷藏运输的建议

分析铁路冷藏运输发展现状及存在的问题,提出加强运输组织管理,发展冷藏运输设备,制定灵活运价政策,以及完善冷藏链建设、开展易腐货物多式联运等发展我国铁路冷藏运输的建议。     

Multi-scale robustness model for highway networks under flood events

Transportation system infrastructure often experiences severe flood-related disruptions such as overtopping, erosion, and scour. The ensuing damages can result in enormous direct and indirect economic losses to the traffic network and consequently the individuals through conditions like inaccessibility to commuters and reduction in traffic safety. Many studies have claimed that a robust transportation system could significantly prevent such consequences from natural hazards such as floods, highlighting the importance of robustness measures that could be used by decision-makers to properly manage flooded transportation system. Most available measures related to network robustness assessment are qualitative, and while some recent studies have focused on such evaluation using quantitative assessment approaches related to environmental or social-economic operations, they lack the holistic view towards robustness under flood events. This study develops a composite multi-scale transportation-system robustness model considering flood hazards by synthesizing geographical damage recognition, topological functionality analysis, network operation evaluation, and traffic-user loss estimation. This integrated model has been applied in a real-world highway network, mainly revealing that a given intensive flood occurrence at different locations may result in a variety of after-flood disruptions in the transportation network. To assist the asset owners with developing more reasonable prevention and recovery plans, the developed multi-scale robustness index presents both visible multi-denominational flood consequences and an overall post-event transportation-system robustness indicator.     

国际集装箱多式联运与东部港口竞争力分析

从北方中西部地区外贸货物国际集装箱多式联运的路径优化分析入手，分别通过对经上海、青岛和连云港转运的全程广义运输成本的估算，以及概率型交通量分配模型的应用，就我国东部港口之间的竞争力水平进行了实证研究。     

浅谈4900carPCTC倾斜试验的组织与实施

我司在为英国建造的4900carPCTC中,制定了一套行有效的试验方法,首制船倾斜试验一次性成功。首制船能取得这样的成果,最主要是得益于合理的组织机构,科学的管理方法,这也标志着我司管理水平上了新台阶,这种科学的试验方法值得推广。     

Economic indicators for the US transportation sector

Since the transportation sector plays an important role in business cycle propagation, we develop indicators for this sector to identify its current state, and predict its future. We define the reference cycle, including both business and growth cycles, for this sector over the period from 1979 using both the conventional National Bureau of Economic Research (NBER) method and modern time series models. A one-to-one correspondence between cycles in the transportation sector and those in the aggregate economy is found; however, both business and growth cycles of transportation often start earlier and end later than those of the overall economy. We also construct an index of leading indicators for the transportation sector using rigorous statistical procedures, and is found to perform well as a forecasting tool.     

我国铁路双层集装箱列车运输组织研究

分析了国外铁路双层集装箱运输的组织方法,研究了我国铁路双层集装箱列车的种类、编成辆数、开行条件、组织原则和车底需要数量。     

浙江省发展江海联运的可行性研究

江海联运是一种经济有效的运输模式。本文对江海联运的特点进行了概括说明,分析了国内外的发展状况,重点对影响浙江省江海联运发展的航道、货源等因素进行了研究,得出浙江省应适度发展江海联运的结论。