نتایج جستجو برای: street traffic control
تعداد نتایج: 1430279 فیلتر نتایج به سال:
3 Dispersion of particles, as evidenced by changes in their number distributions (PNDs) and 4 concentrations (PNCs), in urban street canyons, is still not well understood. This study compares 5 measurements by a fast–response particle spectrometer (DMS500) of the PNDs and the PNCs (5– 6 1000 nm, sampled at 1 Hz) at street and rooftop levels in a Cambridge (UK) street canyon, and 7 examines mixi...
Three dimensional simulations are carried out to estimate the effect of wind direction, wind speed and geometry on the flow and dispersion of vehicular pollutant in a street canyon. The pollutant sources are motor vehicles passing between the two buildings. Suitable emission factors for petrol and diesel vehicles at varying vehicle speed are used for the estimation of the rate of emission from ...
BACKGROUND Outdoor ambient polycyclic aromatic hydrocarbon (PAH) concentrations are variable throughout an urban environment. However, little is known about how variation in semivolatile and nonvolatile PAHs related to the built environment (open space vs. semi-closed space) contributes to differences in concentrations. METHODS We simultaneously collected 14, two-week samples of PAHs from the...
Due to the concentration of population and economic activities in metropolitan areas, urban transportation system suffers many challenges, e.g. traffic congestion and parking space storage, which affect each individuals travel experience. Previous studies looked into the transportation condition sensing using various static or mobile sensors and the travel support services based on the sensing ...
In terms of its perceived threat to society, street racing seems to have fallen somewhere between regular traffic offences and car theft. Yet it has little in common with either. So far as I am aware, street racing has not been analysed by previous writers. Thus, not surprisingly, most theories have little to offer such an analysis. The key argument made in this article is that the norms of str...
A general proecological urban road traffic control idea for the street canyon is proposed with emphasis placed on development of advanced continuum field gasdynamical (hydrodynamical) control model of the street canyon. The continuum field model of optimal control of street canyon is studied. The mathematical physics' approach (Eu-lerian approach) to vehicular movement, to pollutants' emission,...
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