Erfei Wang

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We report a physical mechanism responsible for initiating a vacuum breakdown process of a single carbon nanotube (CNT) during field emission. A quasidynamic method has been developed to simulate the breakdown process and calculate the critical field, critical emission current density and critical temperature beyond which thermal runaway occurs before the(More)
Wireless Sensor Networks (WSNs) have been widely applied in many domains. Medium Access Control (MAC) protocols, the bottom part of the WSNs' protocols, have a significant influence on the performance of the network. Considering the deficiencies of back off mechanism in SMAC, we modify the RTS frame as well as the contention window. Then we put forward an(More)
In standard backfill algorithms, a job will be terminated immediately it has been processed for its estimated runtime. This drives users not to provide tight estimates to make their jobs to be scheduled earlier but at the risk of being killed. This paper presents an enhanced mechanism to tolerate underestimated jobs by continuing processing them on(More)
Highly enantioselective pyridine-directed rhodium-catalyzed asymmetric hydrogenation of challenging 1,1-diarylalkenes is achieved by using [Rh(NBD)DuanPhos]BF4 as a precatalyst. Various types of 2-pyridine substituted 1,1-diarylalkenes could be hydrogenated with good to excellent enantioselectivities, which provide an efficient route to the synthesis of(More)
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