Based on the 16–32 m simply-supported beam bridge Shanghai-Kunming high-speed railway, a collision model of CRTS II track system was established. The considered longitudinal, horizontal as well vertical nonlinear constraints among structural layers, and Kelvin element used to simulate pounding effect gaps. seismic response firstly analyzed then influences different cases damaged plate, base mor...

a typical radio frequency identification system (rfid) includes one reader and a number of tags. the reader transmit to commands to the tags with interrogation radio signals, and tags receive the command and then respond with their identification. readers with interrogation signals can read tags’ responses. in rfid systems, when multiple tags respond to one reader simultaneously, tag collision ...

rfid system is a wireless technology that can transfer data between tags and readers via radio frequency. in an rfid network, readers are located close to each other to obtain optimal connectivity and sufficient coverage. in such an environment, which is called dense reader environment (dre).different types of collisions such as reader-to-reader and reader-to-tag ones, often lead to serious pro...

This paper presented a new technique of over-height vehicle detection. This technique was advanced driver assistance system to reduce collisions between motorists and overhead structures. The proposed technique was design by three different methods; mechanical, optical, and image processing method. The technique achieved at a real-time operation. This technique consisted of three stages; overhi...

The present paper discusses the di↵usion approximation of the linear Boltzmann equation in cases where the collision frequency is not uniformly large in the spatial domain. Our result applies for instance to the case of radiative transfer in a composite medium with optically thin inclusions in an optically thick background medium. The equation governing the evolution of the approximate particle...

Lake Urmia in northwestern Iran is one of the hypersaline lakes of world. In the Urmia region a Cenozoic island arc was formed by northeastward subduction of Neo-Tethyan oceanic plate beneath central Iran; the lake is therefore located in the fore-arc basin tectonic setting. Satellite imagery of the Urmia region illustrates that the trend of faults are in two main NE-SW and NW-SE directions. Th...

The PHENIX muon trigger upgrade adds Level-1 trigger detectors to existing forward muon spectrometers and will enhance the ability of the experiment to pursue a rich program of spin physics in polarized proton collisions at √ s = 500 GeV . The additional muon trigger detectors and Level-1 trigger electronics will allow the experiment to select high momentum muons from the decay of W -bosons and...

We have produced a Bose-Einstein condensate of metastable helium He containing over 1.5 107 atoms, which is a factor of 25 higher than previously achieved. The improved starting conditions for evaporative cooling are obtained by applying one-dimensional Doppler cooling inside a magnetic trap. The same technique is successfully used to cool the spin-polarized fermionic isotope He , for which the...