Since it's made up of over 7,000 islands,the Philippines is not a nation with a well‑developed railway transportation.That means coach buses are going to be your best bet for getting city‑to‑city.There is a small ...Since it's made up of over 7,000 islands,the Philippines is not a nation with a well‑developed railway transportation.That means coach buses are going to be your best bet for getting city‑to‑city.There is a small light rail system called the Light Rail Transit(LRT)in the Metro Manila area,but it's desperately inefficient.展开更多
Considering the difference in driving parameters of buses and social vehicles on the arterial,an arterial traffic signal coordination model that takes into account social vehicles and buses on the basis of the maximum...Considering the difference in driving parameters of buses and social vehicles on the arterial,an arterial traffic signal coordination model that takes into account social vehicles and buses on the basis of the maximum bandwidth is proposed.By using the pre-set parameters of a common cycle,green/red duration and known parameters of bus dwell time distribution,link length and vehicle speed and solving the mixed-integer-linear programming and optimizing the signal offsets,the model obtains the signal control parameters of the green bands both of social vehicles and buses.Finally,taking Wangjiang Road in Hefei as an example,simulation and evaluation are carried out by VISSIM.The results show that the new model has 15.2%and 13.2%reduction in average person delay and number of stops,respectively,compared with the traditional coordinated control method.展开更多
With the continuous development of urban public transportation, the harmful GHG emissions and pollutants generated by itself and the consequent issues such as the losses of residents’ health, economic value and resid...With the continuous development of urban public transportation, the harmful GHG emissions and pollutants generated by itself and the consequent issues such as the losses of residents’ health, economic value and residents’ welfare have become the focus of social attention. In order to study the impacts of promoting new energy vehicles on public transportation pollution mitigation and residents’ health benefits, this paper adopts the LEAP model to build some scenarios that fulfill different development needs to quantitatively analyze the ownership of new energy buses, the reduction of pollutants and the losses of residents’ health welfare. It is concluded that promoting new energy buses comprehensively can significantly reduce the emissions of atmospheric pollutants and the economic losses of residents’ health, but cannot fully realize the targets of greenhouse gas reduction under Life Cycle Analysis.展开更多
AUTONOMOUS buses gliding through the streets,satellites with flexible solar wings whizzing through space,smart electric vehicle factories running at full speed...In recent years,Beijing has seen the emergence of a lar...AUTONOMOUS buses gliding through the streets,satellites with flexible solar wings whizzing through space,smart electric vehicle factories running at full speed...In recent years,Beijing has seen the emergence of a large number of cutting-edge technology companies,confirming the city’s role as a melting pot of scientific innovation in China.展开更多
With a boom in its science and technology sector,Beijing is establishing itself as a hotbed of innovation Autonomous buses gliding through the streets,satellites with flexible solar wings whizzing through space,smart ...With a boom in its science and technology sector,Beijing is establishing itself as a hotbed of innovation Autonomous buses gliding through the streets,satellites with flexible solar wings whizzing through space,smart electric vehicle factories running at full speed…In recent years,Beijing has seen the emergence of a large number of cutting-edge technology companies,confirming the city’s role as a melting pot of scientific innovation in China.展开更多
Designed and built by eight Dutch engineers,the worlds longest bicycle is 55.16 meters,roughly the same length as four double-decker buses.39-year-old Ivan Schalk had been thinking about building the world's longe...Designed and built by eight Dutch engineers,the worlds longest bicycle is 55.16 meters,roughly the same length as four double-decker buses.39-year-old Ivan Schalk had been thinking about building the world's longest bicycle since reading about it in The Guinness Book of Records when he was a child,but he only started this project in 2018,as a way to fill up his free time.展开更多
氢燃料电池车在碳排放方面具有独特优势,研究氢燃料电池车的碳减排贡献,对于实现“碳达峰”、“碳中和”目标有着很大的意义.为了评价氢燃料电池车的碳排放情况,本文以氢燃料电池车中比较典型的氢燃料电池大客车为研究对象,针对其生产...氢燃料电池车在碳排放方面具有独特优势,研究氢燃料电池车的碳减排贡献,对于实现“碳达峰”、“碳中和”目标有着很大的意义.为了评价氢燃料电池车的碳排放情况,本文以氢燃料电池车中比较典型的氢燃料电池大客车为研究对象,针对其生产、使用以及回收阶段的排放的CO_(2)进行了全生命周期评价,分析其在全生命周期各环节的碳足迹.并且研究轻量化材料在使用阶段中对碳足迹的影响,着重研究组成膜电极的主要成分铂(Pt)在回收阶段的碳排放情况.结果表明,在生产阶段,高压储氢罐以及燃料电池堆的碳排放比较严重,生产整车的碳排放达到84550.90 kgCO_(2)eq;在使用阶段,使用轻量化材料能够使碳排放减少大约30%;在回收阶段,除了回收作为客车储能电池的磷酸铁锂(Lithium Iron Phosphate,LFP)电池之外,车身、底盘、平衡装置以及Pt的回收都对碳减排有贡献,回收阶段最终可实现12308 kgCO_(2)eq的碳减排.展开更多
The transit bus environment is considered one of the primary sources of transmission of the COVID-19(SARSCoV-2)virus.Modeling disease transmission in public buses remains a challenge,especially with uncertainties in p...The transit bus environment is considered one of the primary sources of transmission of the COVID-19(SARSCoV-2)virus.Modeling disease transmission in public buses remains a challenge,especially with uncertainties in passenger boarding,alighting,and onboard movements.Although there are initial findings on the effectiveness of some of the mitigation policies(such as face-covering and ventilation),evidence is scarce on how these policies could affect the onboard transmission risk under a realistic bus setting considering different headways,boarding and alighting patterns,and seating capacity control.This study examines the specific policy regimes that transit agencies implemented during early phases of the COVID-19 pandemic in USA,in which it brings crucial insights on combating current and future epidemics.We use an agent-based simulation model(ABSM)based on standard design characteristics for urban buses in USA and two different service frequency settings(10-min and 20-min headways).We find that wearing face-coverings(surgical masks)significantly reduces onboard transmission rates,from no mitigation rates of 85%in higher-frequency buses and 75%in lower-frequency buses to 12.5%.The most effective prevention outcome is the combination of KN-95 masks,open window policies,and half-capacity seating control during higher-frequency bus services,with an outcome of nearly 0%onboard infection rate.Our results advance understanding of COVID-19 risks in the urban bus environment and contribute to effective mitigation policy design,which is crucial to ensuring passenger safety.The findings of this study provide important policy implications for operational adjustment and safety protocols as transit agencies seek to plan for future emergencies.展开更多
文摘Since it's made up of over 7,000 islands,the Philippines is not a nation with a well‑developed railway transportation.That means coach buses are going to be your best bet for getting city‑to‑city.There is a small light rail system called the Light Rail Transit(LRT)in the Metro Manila area,but it's desperately inefficient.
基金The National Natural Science Foundation of China(No.51878236)。
文摘Considering the difference in driving parameters of buses and social vehicles on the arterial,an arterial traffic signal coordination model that takes into account social vehicles and buses on the basis of the maximum bandwidth is proposed.By using the pre-set parameters of a common cycle,green/red duration and known parameters of bus dwell time distribution,link length and vehicle speed and solving the mixed-integer-linear programming and optimizing the signal offsets,the model obtains the signal control parameters of the green bands both of social vehicles and buses.Finally,taking Wangjiang Road in Hefei as an example,simulation and evaluation are carried out by VISSIM.The results show that the new model has 15.2%and 13.2%reduction in average person delay and number of stops,respectively,compared with the traditional coordinated control method.
文摘With the continuous development of urban public transportation, the harmful GHG emissions and pollutants generated by itself and the consequent issues such as the losses of residents’ health, economic value and residents’ welfare have become the focus of social attention. In order to study the impacts of promoting new energy vehicles on public transportation pollution mitigation and residents’ health benefits, this paper adopts the LEAP model to build some scenarios that fulfill different development needs to quantitatively analyze the ownership of new energy buses, the reduction of pollutants and the losses of residents’ health welfare. It is concluded that promoting new energy buses comprehensively can significantly reduce the emissions of atmospheric pollutants and the economic losses of residents’ health, but cannot fully realize the targets of greenhouse gas reduction under Life Cycle Analysis.
文摘AUTONOMOUS buses gliding through the streets,satellites with flexible solar wings whizzing through space,smart electric vehicle factories running at full speed...In recent years,Beijing has seen the emergence of a large number of cutting-edge technology companies,confirming the city’s role as a melting pot of scientific innovation in China.
文摘With a boom in its science and technology sector,Beijing is establishing itself as a hotbed of innovation Autonomous buses gliding through the streets,satellites with flexible solar wings whizzing through space,smart electric vehicle factories running at full speed…In recent years,Beijing has seen the emergence of a large number of cutting-edge technology companies,confirming the city’s role as a melting pot of scientific innovation in China.
文摘Designed and built by eight Dutch engineers,the worlds longest bicycle is 55.16 meters,roughly the same length as four double-decker buses.39-year-old Ivan Schalk had been thinking about building the world's longest bicycle since reading about it in The Guinness Book of Records when he was a child,but he only started this project in 2018,as a way to fill up his free time.
文摘氢燃料电池车在碳排放方面具有独特优势,研究氢燃料电池车的碳减排贡献,对于实现“碳达峰”、“碳中和”目标有着很大的意义.为了评价氢燃料电池车的碳排放情况,本文以氢燃料电池车中比较典型的氢燃料电池大客车为研究对象,针对其生产、使用以及回收阶段的排放的CO_(2)进行了全生命周期评价,分析其在全生命周期各环节的碳足迹.并且研究轻量化材料在使用阶段中对碳足迹的影响,着重研究组成膜电极的主要成分铂(Pt)在回收阶段的碳排放情况.结果表明,在生产阶段,高压储氢罐以及燃料电池堆的碳排放比较严重,生产整车的碳排放达到84550.90 kgCO_(2)eq;在使用阶段,使用轻量化材料能够使碳排放减少大约30%;在回收阶段,除了回收作为客车储能电池的磷酸铁锂(Lithium Iron Phosphate,LFP)电池之外,车身、底盘、平衡装置以及Pt的回收都对碳减排有贡献,回收阶段最终可实现12308 kgCO_(2)eq的碳减排.
文摘The transit bus environment is considered one of the primary sources of transmission of the COVID-19(SARSCoV-2)virus.Modeling disease transmission in public buses remains a challenge,especially with uncertainties in passenger boarding,alighting,and onboard movements.Although there are initial findings on the effectiveness of some of the mitigation policies(such as face-covering and ventilation),evidence is scarce on how these policies could affect the onboard transmission risk under a realistic bus setting considering different headways,boarding and alighting patterns,and seating capacity control.This study examines the specific policy regimes that transit agencies implemented during early phases of the COVID-19 pandemic in USA,in which it brings crucial insights on combating current and future epidemics.We use an agent-based simulation model(ABSM)based on standard design characteristics for urban buses in USA and two different service frequency settings(10-min and 20-min headways).We find that wearing face-coverings(surgical masks)significantly reduces onboard transmission rates,from no mitigation rates of 85%in higher-frequency buses and 75%in lower-frequency buses to 12.5%.The most effective prevention outcome is the combination of KN-95 masks,open window policies,and half-capacity seating control during higher-frequency bus services,with an outcome of nearly 0%onboard infection rate.Our results advance understanding of COVID-19 risks in the urban bus environment and contribute to effective mitigation policy design,which is crucial to ensuring passenger safety.The findings of this study provide important policy implications for operational adjustment and safety protocols as transit agencies seek to plan for future emergencies.
