Urban rail is widely considered to be a form of low-carbon green transportation, but there is a lack of specific quantitative research to support this. By comparing the mode, distance, and corresponding energy consumption of residents before and after the opening of rail transit, this paper establishes a carbon reduction method for rail transit. A measurement model takes the passenger carbon em...

In recent years, the rail transport has achieved rapid development. In assuming the responsibility of promoting the transport task of the economic development, it also faces greater challenges of the rapid growth of passenger volume and safety guarantee. To carry out research on rail traffic safety assessment has essential theoretical and practical significance in protecting public property and...

We have demonstrated a novel micro/nano transportation system using the adenosine triphosphate (ATP)-driven biomolecular motors. Two kinds of linear biomolecular motor systems, microtubulekinesin [1] and actinmyosin [2], are investigated as driving mechanisms in the system. The rail molecules, microtubules, and actin are patterned on a glass substrate using a regular soft lithography technique ...

This report explores pathways to reducing transportation based carbon dioxide emissions in the United States. The goal is to analyze the feasibility of reducing the level of transportation based carbon dioxide emissions in 2050 to 50% of the level they were at in 2005. Emissions have been steadily rising over the past century, and if left uncurbed, will have a negative effect on the quality of ...

Urban transportation has become a planner's quagmire in a war that seemingly cannot be won. America's highways are jammed at rush hour, causing infuriating delays. Bus service, never fast, has deteriorated over the years, while fares have risen. Pressures to expand rail service to outlying areas remain strong, even though current rail operations cannot attract enough riders to cover more than a...

America’s transportation infrastructure is the backbone of our economy. A strong infrastructure means a strong America – an America that competes globally, supports local and regional economic development, and creates jobs. Strategic investments in our transportation infrastructure are vital to our national security, economic growth, transportation safety and our technology leadership. This doc...

Rail surface defects such as the abrasion, scratch and peeling often cause damages to the train wheels and rail bearings. An efficient and accurate detection of rail defects is of vital importance for the safety of railway transportation. In the past few decades, automatic rail defect detection has been studied; however, most developed methods use optic-imaging techniques to collect the rail su...

A rail transit network usually represents the core of a city’s public transportation system. The overall topological structures and functional features of a public transportation network, therefore, must be fully understood to assist the safety management of rail transit and planning for sustainable development. Based on the complex network theory, this study took the Beijing Subway system (BSS...