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Since a laptop caught fire in 2006 at the latest, Li-ion cells were considered as more dangerous than other accumulators [1]. Recent incidents, such as the one involving a BYD e6 electric taxi [2] or the Boeing Dreamliner [3], give rise to questions concerning the safety of L#i-ion cells. This is a crucial point, since Li-ion cells are increasingly integrated in all kinds of (electric) vehicles. Therefore...
In order to study stability of geogrids-reinforced high embankment, by indoor direct shear test and pull-off test respectively, interface properities between geogrids and stuffing were studied. The study results indicate that: the variation of water content of stuffing have great influence on geogrids-reinforced high embankment, along with increasing of water content of stuffing, the frictional resistance...
The lithium ion (Li-ion) battery market has undergone tremendous growth since its conception in 1990. Projections have indicated that the Li-ion battery market in the United States will top $9 billion in the next 3 years. Several factors including technical innovation, increased use of sophisticated consumer electronic gadgets and surge in high efficiency power sources for industrial applications...
This paper presents a structural health monitoring system for monitoring, with reduced visual impact, one historical building structure. The system is based on fiber Bragg gratings and comprises 19 displacement sensors and 5 temperature sensors. All the sensors were custom made according to the monitoring points' characteristics. The results obtained over the first year of monitoring are presented...
Safety of lithium-ion cells is mainly related to thermal reactivity of the components. Active materials play a major role: carbon materials because they directly influence the kinetics of reactions at the negative electrode, positive materials because of their relation with their respective delithiation state. Adequately substituted nickel based materials appear as the most stable positive materials...
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