摘要：Carbonyl compounds with elements of C, H, and O and reversible redox-active centers are promising elec- trode materials in rechargeable batteries owing to their high theoretical capacity, structure flexibility and resources abun- dance. However, the low conductivity and the dissolution of active molecules in organic electrolyte limit the practical ap- plication. Immobilizing the carbonyls on graphene provides a simple approach to address these two issues. However, most reported interaction between carbon-based substrates and carbonyl compounds is weak π-π interaction, which is not strong enough to prohibit the detachment of active ma- terials from carbon surface, and thus leading to undesirable cycling performance. Herein, we applied the first principle calculations to study the carbonyls-graphene interaction and found that the weak rc-a interaction can be rationally converted to the strong a-Li-~~ interaction via introducing the groups containing Li atoms. The introduced Li atoms can cooperatively bind with the two aromatic a components through the covalent Li-carbonyl compounds interaction and Li-graphene interaction. The concept of ~（-Li-Tr interaction provides a versatile method to suppress the dissolution of active materials and increase the electronic conductivity at the same time, which gains insight into the design of organic electrode materials for rechargeable batteries with high performance.

摘要：从经济和社会效益两方面说明建设古交坑口电厂是必要的。从燃料、水源、铁路运输等方面说明古交坑口电厂是可行的。

摘要：一、网格供电的必要性矿井供电的可靠性、安全性、连续性对矿井安全生产有着特别重要的意义.它直接影响矿井通风、产量和矿工生命安全.煤矿企业生产者对高压供电系统的可靠性虽已重视,但还没有达到使其完全能不停电的程度.有时主供电源线路故障,在投入备用电源线路前,尚有短时失电现象.按《煤矿安全规程》规定设有备用电源,但短时停电还是不可避免的.对于低压配电系统。

摘要：毫米波宽带频率源是现代电子战与雷达系统中的核心部件,对电子系统性能起着至关重要的作用。研制了一种微小尺寸的毫米波宽带频率源,采用单片低温共烧陶瓷(LTCC)集成技术,将PLL(Phase Lock Loop)产生的基带信号通过倍频、分段滤波和放大,在K至Ka波段范围内得到了低相噪、低杂散和50 MHz步进的信号输出。整个频率源在30.0 mm×30.0 mm×6.5 mm小体积尺寸内高密度封装实现,具有很好的实用性和广阔应用前景。