When Rasa is in motion, hydrogen stored in a compressed tank at the rear of the vehicle flows through a small fuel cell, where it combines with oxygen to produce water and electricity.
Our major conclusions are as follows: (1) At a constant vehicle flow, the airflow at the roof opening was always from outside to inside, and no respiration phenomenon was observed.
(4) At a constant vehicle flow rate, roof openings provided a significant volume of ventilation, and the ventilation ability was different at different locations.
Their results showed that there was a critical value that divides the vehicle flow into free and congested flow portions.
Encouraged by the results, London plans to introduce new charges based on a vehicle's carbon emissions; Singapore is going a step further, using the toll and traffic data it collects to predict vehicle flow patterns with technology developed at I.B.M.'s research center here.
In this context, the models allow goods vehicle flows on each link (e.g. at each junction branch) to be estimated and accidents, that may result from a combination of factors including conflicting turning movements, speed differentials between motor vehicles and other traffic entities, pedestrians' need to cross roads, to be investigated.
"Just one year after some roads were completed, they reached vehicle flow volumes that were forecast for 15 to 20 years from now," said Yang Dongyuan, a professor at the School of Transportation Engineering and vice president of Tongji University.
The portion of eq. 9 within brackets predicts the amount of enhanced or diminished dispersion relative to that occurring with V = 10,000 vehicles hr-1, and its value ranges from 0.89 at high vehicle flows and longer distances, to 1.29 at low vehicle flows.
Vehicle flows and speeds were collected at each element in the study sites.
Long traffic light intervals are useful mainly at major intersections with continuous vehicle flows and only during about four peak traffic hours a day.
"We certainly saw heavier than normal congestions into London this morning on all the main routes into the city," said Mick Savage, head of traffic networks at Trafficmaster, a private company that monitors vehicle flows.
