The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse(HVP)breakage,yet its quantitative characterization still lacks deep understanding.Two indicators,namely breakdow...The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse(HVP)breakage,yet its quantitative characterization still lacks deep understanding.Two indicators,namely breakdown delay time(T_(d))and breakdown strength(E_(b))were compared,based on analysis on the two breakdown modes namely wavefront mode and post-wave mode.It was found that T_(d) is more suitable to characterize the susceptibility of ore particles to electrical breakdown in HVP breakage than E_(b).A probabilistic model based on the Weibull distribution is developed to describe the relation of breakdown probability to T_(d).Regression analyses were conducted to investigate how operating parameters and particle properties influence Td and size reduction degree of ore particles in HVP breakage.The regressed models demonstrate potential capability to predict metallic minerals content and HVP breakage degree based on operating parameters and particle properties.展开更多
Improving the electric output and durability of triboelectric nanogenerator(TENG)remains a great challenge.In sliding-mode TENG,surface charge dissipation and charge leakage caused by the volume effect result in serio...Improving the electric output and durability of triboelectric nanogenerator(TENG)remains a great challenge.In sliding-mode TENG,surface charge dissipation and charge leakage caused by the volume effect result in serious energy waste.In this work,a durable dual output mode TENG(DDO-TENG),which includes alteranting current and direct current output modes,is designed to capture the dissipating charges in the surface of charge space accumulation area and the inner leakage charge in porous network to further improve the output performance of sliding TENGs.The output charge density of DDO-TENG reaches 0.847 mC m^(-2),which is 2.39 times as that of the single mode device.In addition,it has strong durability,remaining 95.7%after over 271 k cycles,and it can continuously power electronics by harvesting wind energy.This work provides a strategy for achieving the improvement on output performance and durability and expands the application of TENG.展开更多
基金The financial supports from National Natural Science Foundation of China(Nos.52574313,52204272 and 52074091)to this project。
文摘The susceptibility of ore particles to electrical breakdown plays a critical role for high voltage pulse(HVP)breakage,yet its quantitative characterization still lacks deep understanding.Two indicators,namely breakdown delay time(T_(d))and breakdown strength(E_(b))were compared,based on analysis on the two breakdown modes namely wavefront mode and post-wave mode.It was found that T_(d) is more suitable to characterize the susceptibility of ore particles to electrical breakdown in HVP breakage than E_(b).A probabilistic model based on the Weibull distribution is developed to describe the relation of breakdown probability to T_(d).Regression analyses were conducted to investigate how operating parameters and particle properties influence Td and size reduction degree of ore particles in HVP breakage.The regressed models demonstrate potential capability to predict metallic minerals content and HVP breakage degree based on operating parameters and particle properties.
基金supported by the Natural Science Foundation of Chongqing(Grant No.CSTB2024NSCQMSX0440)the National Key R&D Project from Minister of Science and Technology(2021YFA1201602)+2 种基金the Science and Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJQN202400506)the Doctor Scientific Research Fund of Chongqing Normal University(Grant No.23XLB017)the Technology Research Program of Chongqing Municipal Education Commission(Grant No.KJZD-K202200505)。
文摘Improving the electric output and durability of triboelectric nanogenerator(TENG)remains a great challenge.In sliding-mode TENG,surface charge dissipation and charge leakage caused by the volume effect result in serious energy waste.In this work,a durable dual output mode TENG(DDO-TENG),which includes alteranting current and direct current output modes,is designed to capture the dissipating charges in the surface of charge space accumulation area and the inner leakage charge in porous network to further improve the output performance of sliding TENGs.The output charge density of DDO-TENG reaches 0.847 mC m^(-2),which is 2.39 times as that of the single mode device.In addition,it has strong durability,remaining 95.7%after over 271 k cycles,and it can continuously power electronics by harvesting wind energy.This work provides a strategy for achieving the improvement on output performance and durability and expands the application of TENG.
