In transit

Calculation of 99mTc-DTPA transit times in normal kidney [Persian]

Introduction: Renal dynamic study is a well-established and popular test in routine practice of nuclear medicine. The test is non-invasive, rapid and unique in evaluation of the kidney function. In despite of its clinical values, the parameters derived from renogram are physiologically meaningless. That is due to the fact that renogram is not the true kidney function. From mathematical po...

Fleet Size and Frequency in Rapid Transit Systems

Given is a set of stations linked by railway tracks, forming an undirected railway network. One or more lines are formed in this network. Each line consists of an origin station, a destination station, and a number of intermediate stations. In order to complete the line configuration, you need to decide the frequency (number of services per hour) and the capacity (number of carriages) for each ...

GAO-02-1075T Mass Transit: Challenges in Securing Transit Systems

We appreciate the opportunity to speak with you today about mass transit safety and security in the United States. Over a year has passed since the terrorist attacks of September 11, 2001, realigned our national priorities. While most of the early attention following the September 11 terrorist attacks focused on airport security, emphasis on the other modes of transportation has since grown. Mo...

Improved Public Transit Improved Public Transit

Transit Stops and Stations: Transit Managers’ Perspectives on Evaluating Performance Transit Stops and Stations: Transit Managers’ Perspectives on Evaluating Performance

Passengers, transit managers, adjacent businesses and residents, and local governments all can have strong, and sometimes conflicting, ideas about what makes a good transit stop or station. This paper examines stops and stations from the transit agency’s perspective; transit managers must consider both the logistical and political factors inherent to transit operations as well as the perspectiv...