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在非氯盐体系下,采用化学共沉淀法制备纳米级锑掺杂二氧化锡(ATO)粉体材料,分析锑掺杂浓度、前驱体pH值和前驱体煅烧温度对电导率的影响;采用优化的Adams法,以纳米ATO粉体为载体,制备担载型析氧催化剂二氧化锒(IrO_2)/ATO,并进行XRD分析、电化学阻抗及极化曲线测试。制备ATO粉体电导率最大时(0.581 S/cm)的条件为:Sb掺杂浓度10%,pH值为3.5,煅烧温度为600℃。采用IrO_2/ATO催化剂的单体电池,在800mA/cm~2、80℃时,所需槽电压仅为1.40V。 相似文献
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介绍了采用流延法制备板式固体氧化物燃料电池(SOFC)和化学沉浆法制备管式SOFC单电池的原料选择和制备工艺.通过试验测试,采用该工艺方法制备的两类单电池具有优良的性能. 相似文献
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以活性炭为碳材料,用熔融法、溶剂法、溶剂热浸渍法和沉淀法制备硫碳复合材料,通过SEM、XRD、循环伏安和充放电测试,研究复合工艺对硫碳复合材料性能的影响。溶剂法和溶剂热浸渍法制备的复合材料硫含量不可控,对溶剂选择性较强,且溶剂热浸渍法的操作繁琐,高温反应可能生成有毒物质,复合材料易团聚;熔融法制备的复合材料硫分布均匀,硫-碳间分子结合力强,具有良好的电化学性能;沉淀法操作复杂,硫含量不易控,但硫颗粒可达微纳米级,分布均匀,与碳结合力强,适合于制备石墨烯等前驱体复合物,制备的硫碳复合材料以0.2 C在1.5~3.0 V充放电,首次放电比容量达702.5 m Ah/g,循环20次的容量保持率为72%。 相似文献
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针对国内漆包铜扁线多规格、小批量的需求现状,研究了漆包铜扁线的毛毡法涂漆工艺,系统地介绍了该工艺的实施方案、关键流程、辅料及其制备方法。结果表明:该工艺可简化生产流程、提高成品率,并大大降低漆包扁线的生产成本及劳动强度。 相似文献
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Evaluation of Automatic Train Operation Design for Energy Saving Based on the Measured Efficiency of a Linear‐Motor Train
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Recently, interest in energy savings in railway systems has been increasing because of its environment‐friendly aspects, for example, CO2 emissions. In this paper, the authors propose a scheduling and control system for automatic train operation (ATO) that saves energy. This research in ATO concentrates on the optimization of speed profiles to save energy. The differences in this system from previous work are substantiative experiments on the track and a design that explicitly considers the following energy‐saving operations. First, coasting is installed in speed profiles and maximum speed is decreased by jerk regulation. Second, power‐limiting braking is used in the braking section and regenerative energy is increased. To achieve this braking efficiency, notch operations are updated. Finally, second‐order scheduling is achieved by high speed control using ATO. For the experiments on the track, the efficiency of a linear‐motor train was measured in a pre‐experiment and used to perform accurate numerical calculations. In conclusion, the numerical study shows an energy efficiency increase by 7.3% and the plan for further experiments is determined. 相似文献
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Lei Yang Mark Viste Joachim Hossick-Schott Brian W. Sheldon 《Journal of Electroceramics》2014,32(1):108-116
Previous study has demonstrated that field crystallization of anodic tantalum oxide (ATO) films is associated with large in-plane compressive stresses that evolve in several characteristic stages. The mechanism(s) associated with this stress evolution are not well defined, and the impact of these stresses on the field crystallization process requires further understanding. This work reports investigations of the stress evolution that are designed to evaluate contributions from hydration of the amorphous Ta oxide (ATO), electrostriction and crystal growth. Stresses were monitored in situ with a multi-beam optical technique, to elucidate these different contributions. Measurements were conducted during exposure to the acid electrolyte with and without an applied field, and also during different growth stages. The stress evolution mechanisms include contributions from reactions with the electrolyte (hydration), electrostriction and growth of amorphous and crystalline oxides. In addition, a strong linear correlation between stress evolution and crystal growth was established during longer exposure to electric field. 相似文献
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Joon-Ho Oh Tae-Yeon Seong H.-G. Hong Kyoung-Kook Kim S.-W. Yoon J.-P. Ahn 《Journal of Electroceramics》2011,27(3-4):109-113
We characterized the electrical and chemical properties of Cu-doped In2O3(CIO) (2.5 nm thick)/Sb-doped SnO2(ATO) (250 nm thick) contacts to p-type GaN by means of current-voltage measurement, scanning transmission electron microscope (STEM) and x-ray photoemission spectroscopy (XPS). The CIO/ATO contacts show ohmic behaviors, when annealed at 530 and 630°C. The effective Schottky barrier heights on diodes made with Ni (5 nm)/Au (5 nm) contacts decrease with increasing annealing temperature. STEM/energy dispersive x-ray (EDX) profiling results exhibit the formation of interfacial In-Ga-Sn-Cu-oxide. XPS results show a shift of the surface Fermi level toward the lower binding energy side upon annealing. Based on the STEM and XPS results, the ohmic formation mechanisms are described and discussed. 相似文献
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智能配电网通信业务需求分析及技术方案 总被引:7,自引:0,他引:7
配电通信网是发展智能配电网的基础条件,随着智能配电网、分布式新能源和智能用户的接入,配电通信网的业务需求发生了很大变化。文章分析了智能配电网各部分(高级配电运行、高级量测体系、高级输电运行、高级资产管理)通信业务的需求,初步给出了采用配网光纤、宽带无线接入方式实现智能配电网的通信技术方案,为制定智能配电网通信规划提供参考。 相似文献
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地下直埋发热管稳态温度场计算新方法-模拟热荷法的研究 总被引:1,自引:0,他引:1
为了寻找一种既可真实反映电缆实际情况,又可简便、快速计算电缆温度场的方法,笔者根据温度场和电场的相似性,提出了一种计算地下直埋发热管稳态温度场的新方法—模拟热荷法。首选利用换热量相等的原则,将地表空气对流换热系数等效为一定厚度的土壤,在发热管芯和空气中用模拟热荷代替原来的发热管损耗和空气对土壤温度场的影响;然后根据镜像法,按照地表空气等温、导体等温列出约束方程组;最后利用高斯法求解方程组,求得地下直埋发热管稳态温度场的分布。试验及有限元Ansys仿真验证了模拟热荷法在地下直埋发热管稳态温度场计算中的有效性。 相似文献
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利用模拟热荷法计算地下电缆稳态温度场 总被引:17,自引:0,他引:17
根据电场和温度场的相似性,提出了用于计算地下电缆群稳态温度场的模拟热荷法。利用热路的方法将电缆金属套损耗和铠装层损耗归算到电缆导体。利用调和平均法对电缆导体外的多层介质进行处理,最终将电缆等效为导体和外护层的2层结构。根据换热量相等的原则,将地表空气对流换热系数等效为一定厚度的土壤。在电缆线芯和空气中用模拟热荷代替原来的线芯损耗和空气对土壤温度场的影响。然后根据镜像法,按照地表空气等温、导体等温以及外护层和土壤边界温度梯度相同列出约束方程组。利用高斯法求解方程组,求得地下电缆群稳态温度场的分布。试验和有限元仿真验证了模拟热荷法在地下电缆群稳态温度场计算中的有效性。 相似文献
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永磁直线同步电机由于存在边端效应以及齿槽效应,在运行中不可避免地产生推力波动。针对高速大推力密度应用场景,对一种双边长初级PMLSM开展了优化设计。将有限元法与解析法结合,首先独立分析了轴向长度、极弧系数和初级轭部高度等单个参数对电机水平推力和推力波动的影响,并进一步采用Taguchi法筛选显著性较高的结构参数。在此基础上,以提高电磁推力、减小推力波动为优化目标对电机进行响应面分析,得到最终的电机尺寸优化参数。最后制作样机并搭建实验平台,验证了所提优化方法的有效性。 相似文献