Three-dimensional interconnected cobalt oxide-carbon hollow spheres arrays as cathode materials for hybrid batteries

Hierarchical porous metal oxides arrays is critical for development of advanced energy storage devices. Herein, we report a facile template-assisted electro-deposition plus glucose decomposition method for synthesis of multilayer CoO/C hollow spheres arrays. The CoO/C arrays consist of multilayer interconnected hollow composite spheres with diameters of ～350 nm as well as thin walls of ～20 nm. Hierarchical hollow spheres architecture with 3D porous networks are achieved. As cathode of high-rate hybrid batteries, the multilayer CoO/C hollow sphere arrays exhibit impressive enhanced performances with a high capacity (73.5 mAh g?1 at 2 A g?1), and stable high-rate cycling life (70 mAh g?1 after 12,500 cycles at 2 A g?1). The improved electrochemical performance is owing to the composite hollow-sphere architecture with high contact area between the active materials and electrolyte as well as fast ion/electron transportation path.     

基于脉冲耦合神经网络模型的混合噪声滤除

脉冲耦合神经网络模型是一种仿生系统，它模拟了猫猴的视觉神经系统，受到广泛研究并已应用于图像处理的各个领域。针对现有脉冲耦合神经网络模型的缺陷设计了一种阈值线性衰减的输出带权均值型PCNN模型，简称为L&A-PCNN，并应用于混合噪声去除领域。进一步扩充了PCNN模型的应用领域，并提高了处理图像的性能。以改进后的模型为基础，通过数学推理和实验获得模型关键参数的最优设置方法和范围。将L&A-PCNN与中值滤波器结合对图像去噪领域的难点混合噪声进行修复，仿真实验结果证明在去噪性能上使用L&A-PCNN的算法比现有算法有5%-30%的提高。     

On the the management of rural accountants training information

文章论述了农村财会人员培训信息管理的必要性,介绍了农村财会人员财政支农政策培训管理系统,通过本系统可以对农村财会人员的培训信息进行管理.     

我国公务员道德建设刍议

公务员是特殊的社会群体,加强和改善其道德建设事关和谐社会与政治文明的构建。本文通过分析我国公务员道德建设存在的主要问题及原因,探讨了解决问题的有关对策。     

现代传感器前置放大器设计误区与对策

结合现代传感器前置放大器构成特点,探讨了现代传感器前置放大器设计过程中的几个误区与对策.结果表明:噪声系数最小有时并不能得到最佳噪声性能;RFI整流误差是一个重要而容易被忽视的误差源;驱动电容性负载的情形常见且易振荡;芯片电源噪声(纹波)频率较高时单电容去耦无效.给出了这些问题的实用解决方法.     

班级管理艺术

"软管理"作为一种新的思想观念和新的工作方法,主张在班级管理中应把学生的自我管理、自我教育、自我发展置于教育的中心位置,为学生创设宽容、民主的学习氛围,关注学生的差异.     

子午流注纳支法对大鼠乙酸性胃溃疡愈合质量影响的实验研究

目的 :证实纳支法对消化性溃疡的疗效并探讨其可能机制。方法 :采用醋酸浆膜涂抹法 ,选择溃疡愈合质量评价标准指标 ,观察纳支法对消化性溃疡的疗效。结果 :纳支法组溃疡愈合质量显著高于其他各组 (P<0 .0 1～ 0 .0 5 )。结论 :纳支法的穴位一时间配伍具优越性     

SAR imagery coding based on blocking high frequency energy matching

A new fractal image compression algorithm based on high frequency energy (HFE) partitioning andmatched domain block searching is presented to code synthetic aperture radar (SAR) imagery. In the hybridcoding algorithm, the original SAR image is decomposed to low frequency components and high frequencycomponents by wavelet transform (WT). Then the coder uses HFE of block to partition and searchthe matched domain block for each range block to code the low frequency components. For the high frequencycompone...     

Ecological Footprint and Ecological Security Evaluation in the Upper Min River Basin

On the basis of the ecological footprint (EF) model, this paper studied the ecological security in the Upper Min River Basin ecosystem. The result shows that with 2. 038 2hm^2 per capita ecological capacity (0.422 2hm^2 higher than per capita EF), and 165 825hm^2 ecology surplus, the ecosystem in Upper Min River is generally secure at present. But the arable land is overweighed and omens an ecosecurity crisis. Meanwhile, problems such as low forest coverage rate, severe loss of water and soil, enlargement of aridvalley area, frequent occurrence of mountain hazards and degradation of pastures have been major threats to the eco-security of this region. The calculation result of ten thousand-yuan (RMB) GDP shows that the use of natural resources is extensive, and there will be a rapid increase tendency of EF in the future. In order to maintain the present eco-security, the ways of use natural resources must be improved in the Upper Min River Basin.     

高温装置维修规划的力学原则

从连续损伤力学的基本理论出发,分析了二力杆、承压圆筒、材料不连续结构以及温度场不均匀结构的蠕变损伤规律,据此对高温装置维修规划的力学原则进行了探讨.