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Fast charging-discharging is one of the important requirements for next-generation high-energy Li-ion batteries, nevertheless, electrons transport in the active oxide materials is limited. Thus, carbon coating of active materials is a common method to supply the routes for electron transport, but it is difficult to synthesize the oxide-carbon composite for LiNiO2-based materials which need to be calcined in an oxygen-rich atmosphere. In this work, LiNi0.8Co0.1Mn0.1O2 (NCM811) coated with electronic conductor LaNiO3 (LNO) crystallites is demonstrated for the first time as fast charging-discharging and high energy cathodes for Li-ion batteries. The LaNiO3 succeeds in providing an exceptional fast charging-discharging behavior and initial coulombic efficiency in comparison with pristine NCM811. Consequently, the NCM811@3LNO electrode presents a higher capacity at 0.1 C (approximately 246 mAh g−1) and a significantly improved high rate performance (a discharge specific capacity of 130.62 mAh g−1 at 10 C), twice that of pristine NCM811. Additionally, cycling stability is also improved for the composite material. This work provides a new possibility of active oxide cathodes for high energy/power Li-ion batteries by electronic conductor LaNiO3 coating. 相似文献
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改善门诊流程 促进医患和谐 总被引:2,自引:0,他引:2
改善门诊流程就是以病人为中心,在现有就诊流程的基础上,充分利用信息技术手段,对门诊的作业流程进行重新思考和重新设计,以求得医院门诊在成本、质量、服务和速度等方面获得进一步的改善,从而减缓医护人员与病人之间可能出现的矛盾。从几个方面探讨了改善门诊流程的途径和方法,经多家医院实施和验证,在医护人员工作效率、病人满意度、医院效益等指标上都有了显著提高,和谐的医患关系得到加强。 相似文献
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目的:实现治疗科室业务流程优化和治疗信息实时采集。方法:首先针对治疗科室业务流程特点,详细梳理治疗信息采集共享需求,然后围绕流程优化和科室管理对原有流程进行改进,同时讨论治疗申请与计价软件的主要功能模块和关键实现技术。最后,对软件的应用效果进行小结,并提出持续改进的三点措施。结果:系统已在放疗科试用,取得良好效果。结论:该系统实现放疗等治疗科室治疗业务流程的优化和关键业务信息的实时采集,不仅促进了治疗科室的信息共享、流程改进和业务发展,还提高了医院精细化管理水平。 相似文献
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Thomas P. Forbes F. Levent Degertekin Andrei G. Fedorov 《Journal of electroanalytical chemistry (Lausanne, Switzerland)》2010,645(2):167-173
Electrochemistry and ion transport in a planar array of mechanically-driven, droplet-based ion sources are investigated using an approximate time scale analysis and in-depth computational simulations. The ion source is modeled as a controlled-current electrolytic cell, in which the piezoelectric transducer electrode, which mechanically drives the charged droplet generation using ultrasonic atomization, also acts as the oxidizing/corroding anode (positive mode). The interplay between advective and diffusive ion transport of electrochemically generated ions is analyzed as a function of the transducer duty cycle and electrode location. A time scale analysis of the relative importance of advective vs. diffusive ion transport provides valuable insight into optimality, from the ionization prospective, of alternative design and operation modes of the ion source operation. A computational model based on the solution of time-averaged, quasi-steady advection–diffusion equations for electroactive species transport is used to substantiate the conclusions of the time scale analysis. The results show that electrochemical ion generation at the piezoelectric transducer electrodes located at the back-side of the ion source reservoir results in poor ionization efficiency due to insufficient time for the charged analyte to diffuse away from the electrode surface to the ejection location, especially at near 100% duty cycle operation. Reducing the duty cycle of droplet/analyte ejection increases the analyte residence time and, in turn, improves ionization efficiency, but at an expense of the reduced device throughput. For applications where this is undesirable, i.e., multiplexed and disposable device configurations, an alternative electrode location is incorporated. By moving the charging electrode to the nozzle surface, the diffusion length scale is greatly reduced, drastically improving ionization efficiency. The ionization efficiency of all operating conditions considered is expressed as a function of the dimensionless Peclet number, which defines the relative effect of advection as compared to diffusion. This analysis is general enough to elucidate an important role of electrochemistry in ionization efficiency of any arrayed ion sources, be they mechanically-driven or electrosprays, and is vital for determining optimal design and operation conditions. 相似文献
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电容充放电X线机是放射设备中必不可少的一种,它有使用灵活方便、结构简单、易操作、投资少的特点。具体介绍了该类设备的工作原理和结构特征。 相似文献
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罗启芳 《华中科技大学学报(医学版)》1991,(2)
本文根据劳动卫生和环境保护的要求,对电力、邮电、化工等部门用作备用电源的铅蓄电池采取防酸、隔爆、消氢措施,并研制成实用装置,效果较好。文中叙述了该装置的工作原理及主要试验结果。 相似文献
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