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111.
Chen Hongfeng Li Fen Li Xiangling . School of Environment Natural Resources Renmin University of China Beijing China . School of Natural Resources Environment Hefei University of Technology Hefei Anhui China 《中国人口.资源与环境(英文版)》2007,5(2):41-48
As a megacity with thriving economy, Shanghai is experiencing rapid motorisation and confronted with traffic congestion problems despite its low car ownership. It is of value to look into the policies on emission control of motor vehicle and congestion reduction in such a city to explore how to reconcile mobility enhancement with the environment. Results of a dynamic simulation displayed time paths of emissions from motor vehicles in Shanghai over the period from 2000 to 2020. The simulation results showed that early policies on emission control of motor vehicle could bring about far-reaching effects on emission reduc- tion, and take advantage of available low-polluting technologies and technical innovation over time. Travel demand management would play an important role in curbing congestion and reducing motor vehicle pollution by calming down car ownership rise and deterring inefficient trips as well as reducing fuel waste caused by congestion. 相似文献
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The opportunity Value of Travel Time (VTT) is one of the most important elements of the total cost of recreation day-trips and arguably the most difficult to estimate. Most studies build upon the theoretical framework proposed by Becker (1965) by using a combination of revealed and stated preference data to estimate a value of time which is uniform in all activities and under all circumstances. This restriction is relaxed by DeSerpa's (1971) model which allows the value of saving time to be activity-specific. We present the first analysis which uses actual driving choices between open access and toll roads to estimate a VTT specific for recreation trips, thereby providing a value which conforms to both Becker's and DeSerpa's theoretical models. Using these findings we conduct a Monte Carlo simulation to identify generalizable results for subsequent valuation studies. Our results indicate that 3/4 of the wage rate provides a reasonable approximation of the average VTT for recreation trips, while the commonly implemented assumption of 1/3 of the wage rate generates downward biased results. 相似文献
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Allen H. Hu Ching-Yao Huang Chi-Fu Chen Chien-Hung Kuo Chia-Wei Hsu 《国际发展与全球生态学杂志》2013,20(4):313-323
The accommodation sector is the most demanding energy consumer among all building stock categories. This study quantifies an international tourist hotel in Taiwan to holistically estimate the greenhouse gas emissions of hotel accommodation services through a complete life cycle inventory. The study also investigates the difference between the carbon emissions of the baseline and reduction years to understand the effects of carbon emission reduction on the hotel industry. Results show that energy consumption is the main source of carbon footprint. However, the carbon emissions of other activities, such as the production and transportation of hotel amenities and laundry services, are 15.90% for the baseline year and 16.03% for the reduction year. These values are larger than the 5% cutoff rule according to PAS 2050. Thus, these factors should also be considered in assessing the carbon emissions of accommodation services. Hotel occupancy rate significantly affects carbon emissions during a one-night stay in a standard room as the functional unit. The selection of the functional unit should be considered in the hotel strategy. Although this case study involves an international tourist hotel in Taiwan, the findings and recommendations for improvements can be applied elsewhere. 相似文献
116.
上海市居民出行方式与城市交通CO2排放及减排对策 总被引:10,自引:1,他引:9
以上海市居民出行方式为研究对象,利用联合国政府间气候变化专门委员会(IPCC)温室气体排放计算指南中关于交通能源消费碳排放量的计算方法,探讨2002—2006年上海市居民出行选择的不同交通方式对CO2排放的影响和规律,并提供应对策略.结果表明,2002年以来上海市因居民出行导致的交通CO2排放总量呈显著增长趋势.私家车的CO2排放量增加速度最快,截至2006年私家车CO2排放量约相当于出租车、轨道交通和公交车3种公共交通方式之和.公共交通中,出租车的CO2年排放量和人均CO2排放量都最大,轨道交通的CO2年排放量和人均CO2排放量最小.公交车和出租车的CO2排放量所占比例减少,轨道交通的CO2排放量所占比例增加,这种排放结构的变化有利于减少CO2排放总量.CO2减排的具体措施包括限制私家车数量,设计合理的道路交通方案,使汽车尽可能接近其经济车速,改变汽车燃料种类等,其中限制私家车数量最为关键. 相似文献
117.
Scheringer M Hungerbühler K Matthies M 《Environmental science and pollution research international》2001,8(3):150-155
In the last years, the spatial range (SR) or characteristic travel distance (CTD) of organic chemicals has found increasing scientific interest as an indicator of the long-range transport (LRT) potential and, in combination with persistence, as a kind of 'hazard' indicator on the exposure level. This development coincides with European debates about more effective and more preventive approaches to the chemicals assessment, and about an international, legally-binding instrument for the phase out of persistent organic pollutants (POPs). Persistence and LRT potential are important issues in these debates. Here, the development of the concept of assessing the spatial scale from early ideas in the 1970s and 1980s to recent studies in the field of multimedia fate and transport modeling is summarized. Different approaches to the modeling of environmental transport (advective and dispersive) and different methods for quantifying the SR or CTD are compared. Relationships between SR or CTD and different persistence measures are analyzed. Comparison of these relationships shows that conclusions for chemical assessment should be based on an evaluation of different persistence and spatial scale measures. The use of SR or CTD and persistence as hazard indicators in the chemicals assessment is illustrated. 相似文献
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乡村旅游是现代生态旅游的重要组成部分,农家乐是近20年我国发展最为迅速的乡村旅游形式之一。首先分析了“乡土情结”的由来和与农家乐旅游的紧密联系,进而指出“乡土情结”是旅游者到农家乐去旅游的根本动机,它具体体现在中国人身上就是“土地情结”和“家乡情结”。在此基础上,剖析了农家乐旅游者由“情结”产生的旅游动机和旅游偏好。这类旅游者势必要求体验原汁原味的农家生活情趣,借以慰藉自己的“乡土情结”;然后对南充市近郊农家乐的发展现状和存在的误区进行诊断,以此对南充市近郊农家乐的发展走向提出建议,那就是“走原味之路”。 相似文献
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