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MnO2-pillared layered manganese oxide has been first fabricated by a delamination/reassembling process followed by oxidation reaction and then by heat treatment. The structural evolution of MnO2-pillared layered manganese oxide has been characterized by XRD, SEM, DSC-GTA, IR and N2 adsorption-desorption. MnO2-pillared layered manganese oxide shows a relative high thermal stability and mesoporous characteristic. The layered structure with a basal spacing of 0.66 nm could be maintained up to 400 °C. The electrochemical properties of the synthesized MnO2-pillared layered manganese oxide have been studied using cyclic voltammetry in a mild aqueous electrolyte. Sample MnO2–BirMO (300 °C) shows good capacitive behavior and cycling stability, and the specific capacitance value is 206 F g−1. 相似文献
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提出一种根据断裂面匹配进行破碎刚体复原的算法。首先根据积分不变量采用简单区域生长算法,将碎块表面以棱边为界限分割成多张曲面,根据法矢扰动区分出断裂面和原始面;然后根据断裂面顶点的平均积分不变量是否相近和邻域曲面是否相似,获得少量特征显著的相似点对,其中采用基于相容性约束的方法判断邻域曲面的相似性;之后采用引入三角形相似约束的穷举搜索的方法和投票机制进行断裂面的匹配;最后使用基于回溯的子图融合的方法进行碎块的整体拼合。实验结果表明,该算法能够对较复杂的碎块进行准确的拼接复原。 相似文献
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文章以培养应用型人才为目标,探讨了对《机械常用机构制作与零部件装拆》课程改革的思路,通过项目教学实施了"教、学、做"相结合的教育理念,提出了对《机械常用机构制作与零部件装拆》课程设计的具体建议。 相似文献
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Shuping Yu Mingjun XiXin Jin Kefei HanZhongming Wang Hong Zhu 《Catalysis communications》2010,11(14):1125-1128
Polyaniline-intercalated layered manganese oxide (PANI-MnO2) nanocomposite was synthesized via the delamination/reassembling process. Scanning electron microscopy images indicated that the surface of the multilayer film was smooth and dense. X-ray diffraction analysis showed that the basal spacing of PANI-MnO2 was 1.64 nm. Cyclic voltammetry demonstrated that electrons could be efficiently shuttled between MnO2 and the electrode. At 0.9 V the PANI-MnO2 electrode versus standard calomel electrode, about 50% of rhodamine B was degraded within 70 min under visible light irradiation. 相似文献
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以氧化石墨(GO)为主体, 苯胺-邻甲氧基苯胺导电共聚物(P(An-co-oAs))为客体, 采用剥离/重新组装技术合成出P(An-co-oAs)嵌入GO复合材料. FTIR分析显示, P(An-co-oAs)的N-H基团与GO片层中的C=O基团存在着氢键作用. XRD和TEM分析表明, P(An-co-oAs)/GO保持良好的层状结构, 且随着P(An-co-oAs)含量的增加, 复合材料的层间距不断扩大. P(An-co-oAs)的插入, 使得复合材料的室温电导率比GO提高2~3个数量级. 同时发现, 增加P(An-co-oAs)的含量, 不仅提高了GO的电化学活性, 也改善了GO的锂离子嵌入/脱嵌的循环稳定性. 相似文献
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IP报文分片技术及其在故障分析中的应用 总被引:1,自引:0,他引:1
TCP/IP协议采用分片机制来解决传输层报文与MTU的适配问题及适应传输链路上MTU的变化,但传输层大包产生的连续分片会引起与分片相关的新问题,在网络建设和运行中这类问题往往被忽视。结合某专有网络实际应用中的典型分片相关故障,在对IP报文分片的机理和不同网络设备的分片处理机制差异性简单介绍的基础上,重点分析了故障机理并给出了相应处理措施。测试结果表明:这些措施可有效解决和预防与分片有关的故障,提高了网络的可用性。 相似文献
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A novel layered manganese oxide/poly(aniline-co-o-anisidine) nanocomposite [MnO2/P(An-co-oAs)] was successfully synthesized by a delamination/reassembling process using P(An-co-oAs) ionomer and layered manganese oxide in aqueous solution. This nanocomposite obtained was then characterized by Fourier transform infrared (FTIR) spectra, X-ray diffraction (XRD), electron microscopy (SEM), and thermogravimetric (TG) analysis. X-ray diffraction and electron microscope analysis showed that the MnO2/P(An-co-oAs) nanocomposite had a lamellar structure with increasing interlayer spacing. The MnO2/P(An-co-oAs) nanocomposite exhibited substantially improved conductivity, which was near 100 times greater than that of its pristine MnO2 (3.5 × 10−7 S cm−1). The specific capacitance of the MnO2/P(An-co-oAs) nanocomposite reached 262 F g−1 in 1 M Na2SO4 at a current density of 1 A g−1, which was significantly higher than that of either of its two pristine materials [MnO2 (182 F g−1) or P(An-co-oAs) (127 F g−1)] owing to the synergic effect between the two pristine components. The fabrication mechanism of the nanocomposite was also proposed and discussed in this paper. 相似文献