针对当前地面测距机(DME)导航台的作用范围一般为200 n miles左右[3],飞机在航行过程中往往需要经过多个DME导航台,而传统的机载DME设备只能工作在单频率下,这就需要飞行员手动切换对应地面台的频率,从而增加了飞行员工作量的问题。本...针对当前地面测距机(DME)导航台的作用范围一般为200 n miles左右[3],飞机在航行过程中往往需要经过多个DME导航台,而传统的机载DME设备只能工作在单频率下,这就需要飞行员手动切换对应地面台的频率,从而增加了飞行员工作量的问题。本文从实际工程应用出发,通过对机载DME设备工作过程进行分析,提出多台轮询技术,研究并实现直接扫描和自由扫描两种模式情况,该技术可提高航路定位的精准性,减少飞行员工作量。展开更多
The electrochemical surface area (ESA) of the half-membrane electrode assembly (HMEA) and dimethyl-ether (DME) electrooxidation on the HMEA were examined by cyclic voltammetry (CV). The ESAs of the electrode before an...The electrochemical surface area (ESA) of the half-membrane electrode assembly (HMEA) and dimethyl-ether (DME) electrooxidation on the HMEA were examined by cyclic voltammetry (CV). The ESAs of the electrode before and after DME electrooxidation were calculated from the integrated charge during the adsorption (and/or desorption) of atomic hydrogen minus the charge for the double layer charging in 0.5 mol·L-1 H2SO4. The increase in ESA was observed, and this was attributed to the change of catalyst layer structure, leading to a more effective contact between catalysts and the electrolyte Nafion.展开更多
文摘针对当前地面测距机(DME)导航台的作用范围一般为200 n miles左右[3],飞机在航行过程中往往需要经过多个DME导航台,而传统的机载DME设备只能工作在单频率下,这就需要飞行员手动切换对应地面台的频率,从而增加了飞行员工作量的问题。本文从实际工程应用出发,通过对机载DME设备工作过程进行分析,提出多台轮询技术,研究并实现直接扫描和自由扫描两种模式情况,该技术可提高航路定位的精准性,减少飞行员工作量。
文摘The electrochemical surface area (ESA) of the half-membrane electrode assembly (HMEA) and dimethyl-ether (DME) electrooxidation on the HMEA were examined by cyclic voltammetry (CV). The ESAs of the electrode before and after DME electrooxidation were calculated from the integrated charge during the adsorption (and/or desorption) of atomic hydrogen minus the charge for the double layer charging in 0.5 mol·L-1 H2SO4. The increase in ESA was observed, and this was attributed to the change of catalyst layer structure, leading to a more effective contact between catalysts and the electrolyte Nafion.
