Study of the dry methane reforming process using a rotating gliding arc reactor

Dry methane reforming (DMR) via rotating gliding arc (RGA) discharge, co-driven by a magnetic field and tangential flow, was investigated in this study. Optical emission spectroscopy (OES) was used to characterize the major active species (energetic electrons, radicals, ions, atoms and excited molecules) in the DMR chemical process. The influence of the operational conditions (applied voltage and CH₄/CO₂ ratio) on the basic spectroscopic parameters (electron excitation temperature, electron density and rotational temperature) was determined by spectroscopic methods. The rotational and electron excitation temperatures were approximately 1100–1200 K and 1.1–1.7 eV, respectively, indicating the non-thermal equilibrium characteristics of the RGA discharge. The electron density was approximately 5–20 × 10²¹ m⁻³ by fitting the line shape of H_α at 656 nm. The conversions of the reactants (CH₄ and CO₂) and the selectivities of the products (H₂, CO and C₂ hydrocarbon) were analyzed using a gas chromatograph (GC) under different energy inputs or feed gas proportions. The structure and morphology of carbon black produced during the chemical process was characterized by high-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy, indicating the properties of electrical conductivity and high absorption capacity that can be useful for potential application.     

一种数据流驱动的计算通道容错方案

单粒子翻转发生在数据流驱动的计算通道中时,会产生错误结果甚至计算通道无法正常工作。针对这一问题,文中提出了一种基于地址回卷技术的双模冗余容错方案。该方案采用双计算通道比较,检测结果是否发生错误;利用地址回卷技术还原地址信息,驱动原数据重新计算;对相关性数据流计算进行特定优化回卷。文中基于数据流驱动运算器对方案进行具体实现,实验结果显示,该方案实现了99%以上的可靠率,面积开销仅为三模冗余的76%,时间开销比双模冗余节约最多50%,实现了面积和时间消耗的平衡。     

高斯色噪声下的子阵平滑主模式抑制波束形成

实际海洋波导是一种具有空-时相关性的衰落信道,且其驻留的海洋环境背景噪声场呈现非均匀各向异性的特性,噪声场时空相关性并非δ函数,大孔径声呐的探测性能会受到很大影响。将背景噪声建模为有色高斯随机过程,设计基于子阵平滑的主模式抑制(Dominant Mode Rejection, DMR)波束形成算法,以实现小快拍数条件下具有去相关作用的自适应处理,较好地提高了大孔径阵声呐在高斯色噪声环境下的探测能力。模拟仿真结果表明,该方法具有良好的抑制高斯色噪声的能力。     

EDF调度算法的实时性改进

在实时调度算法中,常用的EDF调度算法是非抢占式的,针对这个问题,研究应用SLAD算法和BACK-SLASH算法来改善EDF调度算法的实时性.对过载情况下的截止期错失率DMR的测试,结果表明其实时性确有所改进.     

改进的DMR位同步算法

位同步是数字通信中最基本和最重要的环节。DMR标准建议的位同步算法在弱信号情况下的同步能力不够强,失步、重新建立同步都会中断通信,最坏情况下会导致通信失败。针对这一情况,提出了一种新的改进同步算法,并对其在弱信号环境的性能进行了仿真测试,获得了显著的改善效果。     

Fundamental algorithm and computational codes for the light beam propagation in high power laser system

The fundamental algorithm of light beam propagation in high power laser system is investigated and the corresponding computational codes are given. It is shown that the number of modulation ring due to the diffraction is related to the size of the pinhole in spatial filter (in terms of the times of diffraction limitation, i. e. TDL) and the Fresnel number of the laser system; for the complex laser system with multi-spatial filters and free space, the system can be investigated by the reciprocal rule of operators.