Mesoporous LiFePO4/C microspheres consisting of LiFePO4 nanoparticles are successfully fabricated by an eco-friendly hydrothermal approach combined with high-temperature calcinations using cost-effective LiOH and Fe3...Mesoporous LiFePO4/C microspheres consisting of LiFePO4 nanoparticles are successfully fabricated by an eco-friendly hydrothermal approach combined with high-temperature calcinations using cost-effective LiOH and Fe3＋ salts as raw materials.In this strategy,pure mesoporous LiFePO4 microspheres,which are composed of LiFePO4 nanoparticles,were uniformly coated with carbon（1.5nm）.Benefiting from this unique architecture,these mesoporous LiFePO4/C microspheres can be closely packed,having high tap density.The initial discharge capacity of LiFePO4/C microspheres as positive-electrode materials for lithium-ion batteries could reach 165.3 mAh/g at 0.1 C rate,which is notably close to the theoretical capacity of LiFePO4 due to the large BET surface area,which provides for a large electrochemically available surface for the active material and electrolyte.The material also exhibits high rate capability（100 mAh/g at 8 C） and good cycling stability（capacity retention of 92.2%after 400 cycles at 8 C rate）.展开更多
A universal simulator capable of simulating virtually any user-defined electrochemical/chemical problems in one-dimensional diffusion geometry was developed based on an exponentially expanding grid modification of the...A universal simulator capable of simulating virtually any user-defined electrochemical/chemical problems in one-dimensional diffusion geometry was developed based on an exponentially expanding grid modification of the existing network approach. Some generalized reaction-diffusion governing equations of an arbitrary electrochemical/chemical process were derived, and program controlled automatic generation of the corresponding PSPICE netlist file was realized. On the basis of the above techniques, a universal simulator package was realized, which is capable of dealing with arbitrarily complex electrochemical/chemical problems with one-dimensional diffusion geometry such as planar diffusion, spherical diffusion, cylindrical diffusion and rotational disk diffusion-convection processes. The building of such a simulator is easy and thus it would be very convenient to have it updated for simulations of newly raised electrochemical problems.展开更多
目的验证改良经环甲膜肌电信号记录法用于全乳晕腔镜甲状腺手术术中神经监测安全性和可行性。方法行全乳晕腔镜单侧甲状腺手术病人50例。在使用气管插管表面电极的同时,一个双针电极经10 mm Trocar观察孔置入手术腔隙,在腔镜镜头引导下...目的验证改良经环甲膜肌电信号记录法用于全乳晕腔镜甲状腺手术术中神经监测安全性和可行性。方法行全乳晕腔镜单侧甲状腺手术病人50例。在使用气管插管表面电极的同时,一个双针电极经10 mm Trocar观察孔置入手术腔隙,在腔镜镜头引导下将针电极插入环甲肌直部和甲状软骨之间。在术中使用标准四步法(V1-R1-R2-V2)定位、显露并评估喉返神经功能。结果50例病人均成功实施了全乳晕腔镜单侧甲状腺手术。术中共监测了50条喉返神经,经环甲膜针电极和气管插管表面电极均成功记录到有效的肌电信号。经环甲膜针电极的肌电信号振幅大于气管插管表面电极[V1/R1=(2179.3±1252.3/2304.8±1644.0)μV vs(937.2±612.8/1088.9±613.5)μV]。术中未发生肌电信号丢失事件,肿瘤切除前后肌电信号无明显变化,手术前后电子喉镜均提示声带运动正常。结论改良经环甲膜肌电信号记录法用于全乳晕腔镜甲状腺手术中神经监测安全可行;安装方便,肌电信号强,不受气管插管位置影响,对腔镜手术操作影响小。展开更多
文摘Mesoporous LiFePO4/C microspheres consisting of LiFePO4 nanoparticles are successfully fabricated by an eco-friendly hydrothermal approach combined with high-temperature calcinations using cost-effective LiOH and Fe3＋ salts as raw materials.In this strategy,pure mesoporous LiFePO4 microspheres,which are composed of LiFePO4 nanoparticles,were uniformly coated with carbon（1.5nm）.Benefiting from this unique architecture,these mesoporous LiFePO4/C microspheres can be closely packed,having high tap density.The initial discharge capacity of LiFePO4/C microspheres as positive-electrode materials for lithium-ion batteries could reach 165.3 mAh/g at 0.1 C rate,which is notably close to the theoretical capacity of LiFePO4 due to the large BET surface area,which provides for a large electrochemically available surface for the active material and electrolyte.The material also exhibits high rate capability（100 mAh/g at 8 C） and good cycling stability（capacity retention of 92.2%after 400 cycles at 8 C rate）.
基金Project supported by the National Natural Science Foundation of China (No. 20173054).
文摘A universal simulator capable of simulating virtually any user-defined electrochemical/chemical problems in one-dimensional diffusion geometry was developed based on an exponentially expanding grid modification of the existing network approach. Some generalized reaction-diffusion governing equations of an arbitrary electrochemical/chemical process were derived, and program controlled automatic generation of the corresponding PSPICE netlist file was realized. On the basis of the above techniques, a universal simulator package was realized, which is capable of dealing with arbitrarily complex electrochemical/chemical problems with one-dimensional diffusion geometry such as planar diffusion, spherical diffusion, cylindrical diffusion and rotational disk diffusion-convection processes. The building of such a simulator is easy and thus it would be very convenient to have it updated for simulations of newly raised electrochemical problems.
文摘目的验证改良经环甲膜肌电信号记录法用于全乳晕腔镜甲状腺手术术中神经监测安全性和可行性。方法行全乳晕腔镜单侧甲状腺手术病人50例。在使用气管插管表面电极的同时,一个双针电极经10 mm Trocar观察孔置入手术腔隙,在腔镜镜头引导下将针电极插入环甲肌直部和甲状软骨之间。在术中使用标准四步法(V1-R1-R2-V2)定位、显露并评估喉返神经功能。结果50例病人均成功实施了全乳晕腔镜单侧甲状腺手术。术中共监测了50条喉返神经,经环甲膜针电极和气管插管表面电极均成功记录到有效的肌电信号。经环甲膜针电极的肌电信号振幅大于气管插管表面电极[V1/R1=(2179.3±1252.3/2304.8±1644.0)μV vs(937.2±612.8/1088.9±613.5)μV]。术中未发生肌电信号丢失事件,肿瘤切除前后肌电信号无明显变化,手术前后电子喉镜均提示声带运动正常。结论改良经环甲膜肌电信号记录法用于全乳晕腔镜甲状腺手术中神经监测安全可行;安装方便,肌电信号强,不受气管插管位置影响,对腔镜手术操作影响小。
