基于激光干涉法测水介质正弦压力的动态校准技术

针对动态压力传感器校准中,压力无法直接准确溯源的问题,一种利用激光干涉法测量水介质折射率的方法用于正弦压力校准。压力腔内充满水介质并产生动态压力,以周期型的正弦压力为例,通过激光干涉测量正弦压力下水介质折射率的改变,得到介质动态压力的大小。为了对正弦压力进行精确测量,建立数学模型并进行实验验证,研制专门的解调系统,通过硬件和软件的配合来实现正弦压力的精确测量。通过静态和动态试验验证了基于激光干涉测量压力的数学模型,激光干涉方法来测量动态压力切实可行,实现动态压力的量值溯源到时间、长度等基本量上。     

Factors determining gasoline soot abatement over CeO2–ZrO2-MnOx catalysts under low oxygen concentration condition

Soot oxidation under a low concentration O₂ (0.5% O₂/N₂) was investigated using CeO₂–ZrO₂-MnO_x mixed oxides with varied amounts of MnO_x, in order to gain low temperature catalytic activity and find out the main factors affecting the soot oxidation. The catalytic activity was remarkably improved over these catalysts compared to that of non-catalyst in such a low concentration of O₂. In particular, CeO₂–ZrO₂-MnO_x with 10% MnO_x doping (M10-CZ) showed the highest catalytic activity with its T₅₀ values of 340 °C under tight contact condition. The results of N₂ adsorption-desorption and X-ray diffraction (XRD) indicated that the textural and structural properties were not positive correlation with soot oxidation, are not the main factors affecting the catalytic activity of CeO₂–ZrO₂ and CeO₂–ZrO₂-MnO_x catalysts. The results of oxygen storage capacity (OSC), hydrogen-temperature programmed reduction (H₂-TPR), O₂ temperature program desorption (O₂-TPD), UV Raman spectroscopy (UV Raman) and X-ray photoelectron spectroscopy (XPS) testified that redox ability, oxygen storage capacity, oxygen desorption capacity at low temperature and surface active oxygen species are more important for soot oxidation. The enhancements of the catalytic behavior after MnO_x addition can be due to the improving of the adsorbed, activation and mobility of reactive oxygen species. In this work, these factors about generation and movement of reactive oxygen species are crucial for soot oxidation in a low oxygen concentration condition.     

STM32F101VB微处理器在气相色谱仪中的应用

由于传统的气相色谱仪外围接口电路存在不通用缺陷,且控制核心单片机无法满足现代气相色谱仪对多维图谱大量数据处理的要求。针对上述问题,研究了一种基于STM32F101VB微处理器的气相色谱仪控制电路。该微处理器使用高性能的ARM Cortex-M3 32位的RISC内核,具有增强I/O端口和APB总线的功能,适用于气相色谱仪的新型控制核心。该设计满足了现代气相色谱仪对通用接口和多维大量数据处理的要求。     

基于恒星观测的船载雷达精度检验方法

针对传统的船载雷达精度检验方法存在诸如协调量大、不能经常进行的不足,提出了基于恒星观测的船载雷达精度检验方法。该方法以安装于船载雷达天线的星敏感器观测恒星的数据为比对基准。推导了将星敏感器光轴在J2000.0地心惯性坐标系中的指向,转换为以船载雷达三轴中心为原点的地平系中指向的公式。针对被跟踪目标在星敏感器中可见和不可见,给出了两种不同的光电偏差修正方法。外场试验结果表明,利用该方法检验雷达精度得到的结果与利用精轨卫星相比,残差小于0.3c,满足对雷达精度检验的要求。该方法不仅可实现雷达精度检验的经常性,也可提高雷达精度检验的实时性和有效性。     

旅客列车线路选择的蚁群算法求解

高速铁路建成后客运通道内的线路组成要素及线路功能将发生较大变化,旅客列车在通道内的线路选择方案也需要进一步优化。采用蚁群算法（ACO）对旅客列车的线路选择进行了设计,给出了转移概率及信息量更新方法,并采用对每个蚁群单独寻优的思路,制定了相应的求解策略。经过实例验证,取得了较好的结果,为今后基于路网条件下的旅客列车线路选择方案决策优化提供了一种新的参考方法。