钽粉氧含量对其钽阳极漏电流的影响

在多年实践经验基础上，用氧含量Ｘ１（质量分数）０．２０％～０．３８％的四种钽粉，控制钽阳极中残余氧含量Ｘ２（质量分数）在０．０８％～０．２０％间，采用正交设计实验研究了对其漏电流的影响，并建立了漏电流峰值ＩＬ和Ｘ１、Ｘ２间的预示方程，描述了漏电流和钽粉氧含量（Ｘ１）、残余氧含量（Ｘ２）间的关系。随后，用预示方程讨论了钽中氧和钽阳极中残余氧对其漏电流的影响。     

日本的广播电视事业

本文较详细地介绍了日本广播电视事业的管理体制，覆盖手段，东京广播电视发射塔的设置情况，以及新媒体实验情况和计划等。并结合我国国情，笔者提出了一些看法。     

铟封稳频He－Ne激光器

稳频Ｈｅ－Ｎｅ激光器中布氏窗片的封接引起的各向异性损耗，是影响激光输出功率的主要因素。采用先进的铟封接技术，可以大大改善稳频管的窗口封接质量，从而减小了腔的损耗，明显地提高了稳频Ｈｅ－Ｎｅ激光器的输出功率。     

Atomic‐Scale CoOx Species in Metal–Organic Frameworks for Oxygen Evolution Reaction

The activity of electrocatalysts strongly depends on the number of active sites, which can be increased by downsizing electrocatalysts. Single‐atom catalysts have attracted special attention due to atomic‐scale active sites. However, it is a huge challenge to obtain atomic‐scale CoO_x catalysts. The Co‐based metal–organic frameworks (MOFs) own atomically dispersed Co ions, which motivates to design a possible pathway to partially on‐site transform these Co ions to active atomic‐scale CoO_x species, while reserving the highly porous features of MOFs. In this work, for the first time, the targeted on‐site formation of atomic‐scale CoO_x species is realized in ZIF‐67 by O₂ plasma. The abundant pores in ZIF‐67 provide channels for O₂ plasma to activate the Co ions in MOFs to on‐site produce atomic‐scale CoO_x species, which act as the active sites to catalyze the oxygen evolution reaction with an even better activity than RuO₂.     

Visual tracking based on the sparse representation of the PCA subspace

We construct a collaborative model of the sparse representation and the subspace representation. First, we represent the tracking target in the principle component analysis (PCA) subspace, and then we employ an L1 regularization to restrict the sparsity of the residual term, an L2 regularization term to restrict the sparsity of the representation coefficients, and an L2 norm to restrict the distance between the reconstruction and the target. Then we implement the algorithm in the particle filter framework. Furthermore, an iterative method is presented to get the global minimum of the residual and the coefficients. Finally, an alternative template update scheme is adopted to avoid the tracking drift which is caused by the inaccurate update. In the experiment, we test the algorithm on 9 sequences, and compare the results with 5 state-of-art methods. According to the results, we can conclude that our algorithm is more robust than the other methods.     

对全氮阴离子N_5~-非金属盐能量水平的认识

<正>火炸药的发展在很大程度上取决于含能化合物的进步,例如优良的推进剂要求具有更高生成焓的含能化合物,以提升火箭的速度和飞行范围。现有的传统单质炸药,爆炸能量最高只有2倍TNT当量;以爆热计,CL-20的能量为1.8倍TNT当量(Badgujar D M,Talawar M B,Asthana S N,et al.Advances in science and technology of modern energetic materials:An overview[J].J Hazard Mater,2008,151:289-     

基于果蝇算法优化广义回归神经网络的机枪枪管初速衰减建模与预测

机枪枪管初速衰减预测是一个复杂的非线性问题。广义回归神经网络方法被广泛应用于非线性问题的建模,但其平滑因子取值对神经网络的预测性能有较大影响。采用果蝇算法对广义回归神经网络的参数进行优化选取,提出了基于果蝇算法优化广义回归神经网络的机枪枪管初速衰减建模方法。基于机枪枪管初速衰减试验数据,建立在不同使用环境下随着累计射弹量的增加,以初速降为特征量的机枪枪管初速衰减预测模型,预测结果与试验结果基本一致,证实了所提方法的可行性。通过与未经优化的广义回归神经网络方法和反向传播神经网络方法建立的预测模型进行比较,其性能明显优于另外两种方法,验证了基于果蝇算法优化的广义回归神经网络方法在建立机枪枪管初速衰减模型中的有效性。     

火药燃烧等离子体电导率理论计算研究

基于火药燃烧等离子体低温、高压、瞬态的弱非理想性质,提出了综合考虑电子与离子、电子与中性粒子碰撞作用的电导率计算模型。通过计算含电离种子K_2CO_3发射药燃烧产物的电子密度和电导率,揭示了火药燃气电子密度和电导率随温度、时间的变化规律。结果表明:在2 000~3 000K范围内,火药燃气的电子密度和电导率随温度的上升而增大;火炮发射过程中,火药燃气的电子密度和电导率随时间逐渐减小,且呈非线性下降趋势。初始时刻,电子密度ne和电导率σ最大,分别为2×10~(22)m~(-3)、705.6 S/m。     

甲醇溶液中五氮唑负离子的制备与表征

以对氨基苯磺酸为起始原料,通过重氮化、缩合和水解反应,合成了3,5-二甲基-4-羟基苯胺盐酸盐,总收率为75%。用3,5-二甲基-4-羟基苯胺盐酸盐制备了-50℃下稳定的3,5-二甲基-4-羟基苯基五唑,收率为66.7%。以甲醇为溶剂,亚铁盐为还原剂,间氯过氧苯甲酸为氧化剂,可切断3,5-二甲基-4-羟基苯基五唑分子中的C—N键,得到少量的五唑负离子,并通过质谱、核磁等方法对其进行表征。同位素标记实验证明五唑环中N原子具有相同的化学环境,说明五唑负离子极有可能具有芳香性。     

基于GPS精确制导信息的"天地环境差"研究

结合某惯性制导运载体实际飞行弹道参数GPS解读值和遥测参数值,完整推导了地面静态标定误差系数和实际飞行惯性测量误差系数差异,为惯性制导系统的"天地环境差"研究奠定了基础.