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The level of air quality in urban centres is affected by emission of several pollutants, mainly coming from the vehicles flowing in their road networks. This is a well known phenomenon that influences the quality of life of people. Despite the deep concern of researchers and technicians, we are far from a total understanding of this phenomenon. On the contrary, the availability of reliable forecasting models would constitute an important tool for administrators in order of assessing suitable actions concerning the transportation policies, public as well private. Referring to the situation of the running fleet and the measured pollutant concentrations concerning the Italian town of Palermo, a data-deduced traffic model is here derived, its truthfulness being justified by a fuzzyfication of the phenomenon. A first validation of the mod...
Comment: 7 pages, 13 figures. Presented at the 2004 IEEE Nuclear Science Symposium, October 18-21, Rome, Italy. Accepted for publication by IEEE Transactions on Nuclear Science
A large system of silicon strip detectors with double sided readout has been successfully commissioned over the course of the last year at the e/sup +/e/sup -/ collider LEP. The readout of this 73728 channel system is performed with custom designed VLSI charge sensitive amplifier chips (CAMEX64A). An overall point resolution of 12 mu m on both sides has been achieved for the complete system. The most important difficulties during the run were beam losses into the detector, and a chemical agent deposited onto the electronics; however, the damage from these sources was understood and brought under control. This and other results of the 1991 data-taking run are described with special emphasis on the operational experience.
The ALEPH Silicon Vertex Detector is the first detector operating in a colliding beam environment that uses silicon strip detectors which provide readout on both sides and hence a three-- dimensional point measurement for the trajectory of charged particles. \par The detector system was commissioned successfully at the $e^+e^-$ collider LEP at the research centre CERN, Switzerland, during the year 1991 while taking data at the $Z^0$ resonance. The achieved spatial resolution of the complete 73~728 channel device (intrinsic plus alignment) is $12 \; \mu m$ in the $r \cdot \phi$ view and $ 12 \; \mu m$ in the $z$ view. \par The design and construction of the entire detector system are discussed in detail and the experience gained in running the detector will be described with special emphasis on the uses of this novel tracking device for...
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