The 21st century ＂Maritime Silk Road＂ strategy is a significant part of the belt and road initiatives of China. The cognition and investigation of ocean environment is essential and necessary in these regions which ...The 21st century ＂Maritime Silk Road＂ strategy is a significant part of the belt and road initiatives of China. The cognition and investigation of ocean environment is essential and necessary in these regions which will provide scientific reference for many fields such as navigation, ocean engineering, and disaster prevent and reduction. A high-resolution cross-calibrated multi-platform wind product is used to analyze gales over the Maritime Silk Road. The yearly mean speed and space distribution of gale, and the frequencies and trends of gale and extreme wind speed are analyzed. The results show that relatively high pools of gale are mainly located in the waters of the Arabian Sea, the Somali Sea, Indo-China Peninsula sea area, and Bay of Bengal in the summer. The gale frequency of the Somali Sea is more than 90%. Overall, the gale days increase year by year in the majority of the South China Sea and the northern Indian Ocean, especially in the autumn and the winter.展开更多
The main aim of this research work is to be aware of the road traffic accident scenario, injurious effects and pattern in Bangladesh. Moreover we are interested to forecast the magnitude of road traffic accidents for ...The main aim of this research work is to be aware of the road traffic accident scenario, injurious effects and pattern in Bangladesh. Moreover we are interested to forecast the magnitude of road traffic accidents for the future so that decision makers can make appropriate decision for precaution. This study also provides an assessment of road traffic accidents in Bangladesh and its impact based on data collected for the period of 1971 to 2017. In this study we have tried to pick up the main reasons of road accidents and to observe the tremendous situation. The study observed that the general trends of road traffic accident (RTA), deaths and injuries reveal that the number of RTA, deaths and injuries increased gradually with little fluctuations form 1971 to 2007 and after 2007 there is a slow decreasing trend. Although the number of RTA and deaths observed decreasing trend in recent years, the ratio of number of deaths to number of accident increased significantly. The rate of register vehicles per 10,000 people increased moderately throughout the period but a sharp increment is exhibited from 2009. Highest percentage of RTA (34%) and deaths is due to RTA (32%) in Dhaka division while the lowest percentage of RTA (4%) in Barisal and Sylhet divisions and deaths is due to RTA (3%) in Barisal division. It is noticed that the maximum number of injuries occurred between ages 21 and 30 while the maximum number of deaths occurred between ages 11 and 30. Most of the RTA and deaths due to RTA are caused by run over by vehicles and head to head collision. The severity of occurring road accident and number of deaths are higher during the festive periods because of involving higher frequency of traveling than usual. The time plot shows that the graph maintains a decreasing movement from 2012 to 2015 but increases from 2015 to 2017. In the research an additive time series model approach is applied. It included the estimation of trend, seasonal variation and random variation using triple exponential smoothing method. We performed forecasting of RTA eliminating seasonal impact for the next three consecutive years (2018-2020) with 95% confidence interval using Holt-Winters exponential technique.展开更多
“一带一路”倡议是我国建立的国际性公共产品和国际合作平台。为全面分析“一带一路”倡议提出十年来国内外对该领域研究的基本状况、研究热点以及发展趋势,文章分别以中国知网(CNKI)收录的2014年至2021年的10337篇中文期刊论文及Web o...“一带一路”倡议是我国建立的国际性公共产品和国际合作平台。为全面分析“一带一路”倡议提出十年来国内外对该领域研究的基本状况、研究热点以及发展趋势,文章分别以中国知网(CNKI)收录的2014年至2021年的10337篇中文期刊论文及Web of Science(WOS)收录的2014年至2021年的1028篇外文期刊论文为分析研究对象,运用Citespace5.0工具软件进行了较为深入的分析。通过文献研究生成的知识图谱比较分析发现:“一带一路”研究的中文文献发文量远高于外文文献发文量,但国外研究机构的合作网络强度相比国内更加紧密。此外,关键词共现网络与关键词聚类图分析发现,“一带一路”中外文献研究热点都集中于“一带一路”提出动机、政治与外交政策、经贸合作、可持续发展、风险与挑战五个方面,但两者研究的侧重点却不尽相同。结合文献分析及“一带一路”倡议高质量发展的目标,提出绿色“一带一路”顶层设计与重点领域发展、“一带一路”数字融合发展以及“一带一路”卫生与健康领域发展等研究方向,以期为持续推进“一带一路”深入研究提供借鉴和参考。展开更多
近年来,综合交通运输体系进入新的发展阶段,对多式联运服务提出了新的要求。为了更好地促进多式联运服务发展,及时把握相关的研究热点、主流观点、理论及方法,本文选择Web of Science作为文献检索引擎,将2011—2022年的文献记录作为数据...近年来,综合交通运输体系进入新的发展阶段,对多式联运服务提出了新的要求。为了更好地促进多式联运服务发展,及时把握相关的研究热点、主流观点、理论及方法,本文选择Web of Science作为文献检索引擎,将2011—2022年的文献记录作为数据源,用动态网络分析的信息可视化技术和工具(CiteSpace)对多式联运进行文献共被引分析、主题共现分析、关键词聚类分析、关键词中介中心性分析以及关键词突现分析,绘制多式联运的知识图谱,呈现多式联运研究领域的知识结构与演进规律,并对未来研究方向进行展望。研究发现:多式联运相关领域的核心期刊文献数量呈现递增趋势,该领域研究受到持续关注;研究热点主要集中在模型方法、路网设计和系统,集装箱运输、公路运输,选址问题和设施配置。研究趋势主要是模型选择、多组分析、移动即服务、公共运输、网络设计、集装箱运输、重力模型、可持续性和恢复力、枢纽站选址。研究前沿主要是设施选址、供应链及交通可达性。未来研究方向可着力关注多式联运整个运输链的管理和归属,以及增强运输链弹性进而提高运输可达性等方面。展开更多
基金The National Natural Science Foundation of China under contract Nos 61501433 and Grant 412760
文摘The 21st century ＂Maritime Silk Road＂ strategy is a significant part of the belt and road initiatives of China. The cognition and investigation of ocean environment is essential and necessary in these regions which will provide scientific reference for many fields such as navigation, ocean engineering, and disaster prevent and reduction. A high-resolution cross-calibrated multi-platform wind product is used to analyze gales over the Maritime Silk Road. The yearly mean speed and space distribution of gale, and the frequencies and trends of gale and extreme wind speed are analyzed. The results show that relatively high pools of gale are mainly located in the waters of the Arabian Sea, the Somali Sea, Indo-China Peninsula sea area, and Bay of Bengal in the summer. The gale frequency of the Somali Sea is more than 90%. Overall, the gale days increase year by year in the majority of the South China Sea and the northern Indian Ocean, especially in the autumn and the winter.
文摘The main aim of this research work is to be aware of the road traffic accident scenario, injurious effects and pattern in Bangladesh. Moreover we are interested to forecast the magnitude of road traffic accidents for the future so that decision makers can make appropriate decision for precaution. This study also provides an assessment of road traffic accidents in Bangladesh and its impact based on data collected for the period of 1971 to 2017. In this study we have tried to pick up the main reasons of road accidents and to observe the tremendous situation. The study observed that the general trends of road traffic accident (RTA), deaths and injuries reveal that the number of RTA, deaths and injuries increased gradually with little fluctuations form 1971 to 2007 and after 2007 there is a slow decreasing trend. Although the number of RTA and deaths observed decreasing trend in recent years, the ratio of number of deaths to number of accident increased significantly. The rate of register vehicles per 10,000 people increased moderately throughout the period but a sharp increment is exhibited from 2009. Highest percentage of RTA (34%) and deaths is due to RTA (32%) in Dhaka division while the lowest percentage of RTA (4%) in Barisal and Sylhet divisions and deaths is due to RTA (3%) in Barisal division. It is noticed that the maximum number of injuries occurred between ages 21 and 30 while the maximum number of deaths occurred between ages 11 and 30. Most of the RTA and deaths due to RTA are caused by run over by vehicles and head to head collision. The severity of occurring road accident and number of deaths are higher during the festive periods because of involving higher frequency of traveling than usual. The time plot shows that the graph maintains a decreasing movement from 2012 to 2015 but increases from 2015 to 2017. In the research an additive time series model approach is applied. It included the estimation of trend, seasonal variation and random variation using triple exponential smoothing method. We performed forecasting of RTA eliminating seasonal impact for the next three consecutive years (2018-2020) with 95% confidence interval using Holt-Winters exponential technique.
文摘“一带一路”倡议是我国建立的国际性公共产品和国际合作平台。为全面分析“一带一路”倡议提出十年来国内外对该领域研究的基本状况、研究热点以及发展趋势,文章分别以中国知网(CNKI)收录的2014年至2021年的10337篇中文期刊论文及Web of Science(WOS)收录的2014年至2021年的1028篇外文期刊论文为分析研究对象,运用Citespace5.0工具软件进行了较为深入的分析。通过文献研究生成的知识图谱比较分析发现:“一带一路”研究的中文文献发文量远高于外文文献发文量,但国外研究机构的合作网络强度相比国内更加紧密。此外,关键词共现网络与关键词聚类图分析发现,“一带一路”中外文献研究热点都集中于“一带一路”提出动机、政治与外交政策、经贸合作、可持续发展、风险与挑战五个方面,但两者研究的侧重点却不尽相同。结合文献分析及“一带一路”倡议高质量发展的目标,提出绿色“一带一路”顶层设计与重点领域发展、“一带一路”数字融合发展以及“一带一路”卫生与健康领域发展等研究方向,以期为持续推进“一带一路”深入研究提供借鉴和参考。
文摘近年来,综合交通运输体系进入新的发展阶段,对多式联运服务提出了新的要求。为了更好地促进多式联运服务发展,及时把握相关的研究热点、主流观点、理论及方法,本文选择Web of Science作为文献检索引擎,将2011—2022年的文献记录作为数据源,用动态网络分析的信息可视化技术和工具(CiteSpace)对多式联运进行文献共被引分析、主题共现分析、关键词聚类分析、关键词中介中心性分析以及关键词突现分析,绘制多式联运的知识图谱,呈现多式联运研究领域的知识结构与演进规律,并对未来研究方向进行展望。研究发现:多式联运相关领域的核心期刊文献数量呈现递增趋势,该领域研究受到持续关注;研究热点主要集中在模型方法、路网设计和系统,集装箱运输、公路运输,选址问题和设施配置。研究趋势主要是模型选择、多组分析、移动即服务、公共运输、网络设计、集装箱运输、重力模型、可持续性和恢复力、枢纽站选址。研究前沿主要是设施选址、供应链及交通可达性。未来研究方向可着力关注多式联运整个运输链的管理和归属,以及增强运输链弹性进而提高运输可达性等方面。
