As a new type of green energy, lithium-ion battery(LIB) has been widely used in various electric portable devices because of its high-voltage, large specific capacity, long cycle life and environmental friendliness [1...As a new type of green energy, lithium-ion battery(LIB) has been widely used in various electric portable devices because of its high-voltage, large specific capacity, long cycle life and environmental friendliness [1,2]. However, today’s anode materials of commercial LIBs cannot meet the further development requirements of smart devices and electric car due to the limitations of the electrode capacity(e.g. 372 mAh g-1 for graphite).展开更多
Activated carbons with large surface area, abundant microporosity and low cost are the most commonly used electrode materials for energy storage devices. However, activated carbons are conventionally made from fossil ...Activated carbons with large surface area, abundant microporosity and low cost are the most commonly used electrode materials for energy storage devices. However, activated carbons are conventionally made from fossil precursors, such as coal and petroleum, which are limited resources and easily aggregate large block in high temperature carbonization processes. In this novel work, we examined the use of rice straw as a potential alternative carbon source precursor for the production of graphene-like active carbon. A very slack activated carbon with ultra-thin two-dimensional （2D） layer structure was prepared by our proposed approach in this work, which includes a pre-treatment process and potassium hydroxide activation at high temperatures. The obtained active carbon derived from rice straw exhibited a capacitance of 255 Fig at 0.5 A/g, excellent rate capability, and long cycling capability （98% after 10,000 cycles）.展开更多
贝叶斯网络(B ayes ian N etw ork)可以把统计学和图论有效地结合起来,近年来成为数据挖掘中的研究热点,其优点可以综合先验信息和样本信息,适于处理不完整数据集。本文采用280例病例作为训练数据,利用B ayes ian netw ork进行大脑胶质...贝叶斯网络(B ayes ian N etw ork)可以把统计学和图论有效地结合起来,近年来成为数据挖掘中的研究热点,其优点可以综合先验信息和样本信息,适于处理不完整数据集。本文采用280例病例作为训练数据,利用B ayes ian netw ork进行大脑胶质瘤高低度的自动诊断,利用严格的B ayes规则进行推理,在推理过程中采用了D分离来简化过程,其诊断正确率达到80%以上,达到了领域专家的要求,而且在可理解性方面要比多层感知器和决策树要好。展开更多
基金supported by National Key Research and Development Program of China (No.2017YFB0702100)the National Natural Science Foundation of China (No.11404017)+4 种基金Technology Foundation for Selected Overseas Chinese Scholar, Ministry of Human Resources and Social Security of China, Beijing Natural Science Foundation (No.20192029)supported by the European Regional Development Fund in the IT4Innovations National Supercomputing Center-Path to Exascale project, No.CZ.02.1.01/ 0.0/0.0/16_013/0001791 within the Operational Programme Research, Development and Education by the Ministry of Education, Youth, and Sport of the Czech Republicgrant No.17-27790S of the Czech Science FoundationsMobility grant No.8J18DE004 of the Ministry of Education, Youngth and Sports of the Czech RepublicSGS No.SP2019/110。
文摘As a new type of green energy, lithium-ion battery(LIB) has been widely used in various electric portable devices because of its high-voltage, large specific capacity, long cycle life and environmental friendliness [1,2]. However, today’s anode materials of commercial LIBs cannot meet the further development requirements of smart devices and electric car due to the limitations of the electrode capacity(e.g. 372 mAh g-1 for graphite).
基金financially supported by the Fundamental Research Funds for the Central Universities(Nos.XDJK2017D003,XDJK2017B055)the Program for Excellent Talents in Chongqing(No.102060-20600218)+1 种基金the Program for Innovation Team Building at Institutions of Higher Education in Chongqing(No.CXTDX201601011)the Chinese Government Scholarship(No.2016AUN032)
文摘Activated carbons with large surface area, abundant microporosity and low cost are the most commonly used electrode materials for energy storage devices. However, activated carbons are conventionally made from fossil precursors, such as coal and petroleum, which are limited resources and easily aggregate large block in high temperature carbonization processes. In this novel work, we examined the use of rice straw as a potential alternative carbon source precursor for the production of graphene-like active carbon. A very slack activated carbon with ultra-thin two-dimensional （2D） layer structure was prepared by our proposed approach in this work, which includes a pre-treatment process and potassium hydroxide activation at high temperatures. The obtained active carbon derived from rice straw exhibited a capacitance of 255 Fig at 0.5 A/g, excellent rate capability, and long cycling capability （98% after 10,000 cycles）.
文摘贝叶斯网络(B ayes ian N etw ork)可以把统计学和图论有效地结合起来,近年来成为数据挖掘中的研究热点,其优点可以综合先验信息和样本信息,适于处理不完整数据集。本文采用280例病例作为训练数据,利用B ayes ian netw ork进行大脑胶质瘤高低度的自动诊断,利用严格的B ayes规则进行推理,在推理过程中采用了D分离来简化过程,其诊断正确率达到80%以上,达到了领域专家的要求,而且在可理解性方面要比多层感知器和决策树要好。
