曲线光顺在惯导平台自标定中的应用

提出了一种新的惯导平台自标定数据处理方法——曲线光顺法。根据自标定数据特点给出了适于自标定数据的曲线光顺准则。分析了野值对曲线二阶差商的影响规律,提出了一种野值剔除算法。通过将最小二乘与B样条结合得出二阶差商参考值,并使实际差商与参考差商距离达到最小从而得到野值修改值。实验结果表明,该文的算法能很好地解决惯导平台自标定数据的野值剔除问题,可通过调节参数来控制光顺精度,并具有算法简便、易于操作的优点。     

Wide‐Band Fine‐Resolution DCO with an Active Inductor and Three‐Step Coarse Tuning Loop

This paper presents a wide‐band fine‐resolution digitally controlled oscillator (DCO) with an active inductor using an automatic three‐step coarse and gain tuning loop. To control the frequency of the DCO, the transconductance of the active inductor is tuned digitally. To cover the wide tuning range, a three‐step coarse tuning scheme is used. In addition, the DCO gain needs to be calibrated digitally to compensate for gain variations. The DCO tuning range is 58% at 2.4 GHz, and the power consumption is 6.6 mW from a 1.2 V supply voltage. An effective frequency resolution is 0.14 kHz. The phase noise of the DCO output at 2.4 GHz is –120.67 dBc/Hz at 1 MHz offset.     

基于云平台的装备车辆状态监控系统

为提高装备车辆数据记录与存储的功能,设计一种基于云平台的装备车辆信息采集和状态监控系统.基于传感器与MCU模块搭建装备车辆状态采集系统,利用云平台对采集系统上传的数据进行存储、融合和预测,结合历史数据和预测结果,对出现的故障和存在的隐患进行预警,构建PC端显示软件,利用云平台的数据处理与存储功能,实现车辆的全维度监测与管理.验证结果表明,该设计可为装备车辆全生命周期的精细化保障和管理提供解决方案.     

水中兵器爆炸威力增强技术的发展思考

鱼雷、水雷和深水炸弹等水中兵器作为海军的主战武器,在历次海战中均发挥了重要作用.战斗部装药作为毁伤的核心要素,其能量水平和能量释放控制模式直接影响了水中兵器装备的作战效能,如何提高水中兵器毁伤威力,发展水中爆炸威力增强新技术一直是各军事强国高度关注的重大问题.现代潜艇和航母等水面舰艇抗爆抗冲击能力的提升,对水中爆炸毁伤技术提出了更高的要求,发展新型水中爆炸毁伤技术,对水中兵器的创新发展具有重要意义.     

焙烧预处理过程中硫的转化对浸金的影响

以贵州某卡林型金矿为悁究对象,采用XRD、化恘分析等方法,探索了焙烧预处理过程中焙烧温度、焙烧时间对硫转化率与金浸出率之间相互影响规律。结果表明,在700℃温度下,焙烧1.5~2 h,可以充分打开金的硫化物包裹,浸出率近90%;硫转化率由83.01%升高至91.02%,金浸出率与硫转化率基本呈线性正相关关系,相关系数r=0.93517。     

高能气体压裂最佳火药量理论计算

利用岩石力学和断裂力学的基础理论,阐述在动态加载下地层岩石强度随加载率的增大而不断变化的理论研究,并给出理论计算表达式.实验数据表明,在冲击载荷作用下,岩石强度会随冲击频率的加大而加大,当载荷速度由准静态增加到105Mpa/s时,岩样的抗压强度要比静态时的大1.65倍左右.这与理论计算数据比较接近,符合相同的变化规律,在此基础上,结合有关火药学理论知识,得出高能气体压裂施工中火药量的有效控制范围.研究结果表明,使用该计算结果能够非常有效的提高高能气体压裂的施工效果.     

固定化酵母薯干原料酒精发酵中试研究

本文论述了固定化酵母薯干原料带渣酒精发酵的中试结果。中试生物反应器容积为１０００Ｌ，采用改性海藻酸钙凝胶为固定化酵母细胞的载体。中试研究中设计了较合理的中试工艺流程，优选出较佳的发酵条件，并考察了生物反应器的性能。试验获得了如下结果：中试装置已运转１９２天，固定化酵母仍保持高活力，并可继续运转；发酵成熟醪酒精含量达６．５～８．０％（ｖ），它比同期传统式酒精发酵高出０．３～０．４％；淀粉利用率达９１～９２％；固定化酵母生物反应器的乙醇生产能力为９．５ＫｇＥｔＯＨ／Ｍ￣３·ｈ，它可比传统式发酵罐的生产能力提高１０～１２倍。     

基于连续时间戳的时钟同步与保持的技术研究

为解决分布式系统中时钟同步问题,提出了时钟服务器被动应答式的同步结构、基于连续时间戳统计平均值的误差、时延计算方法和基于设定时钟精度的时钟保持技术。在软件同步的情况下,提高了同步精度,减少了因时钟同步而产生的网络通信量、各分布式系统的CPU开销。     

Optimization design and realization of Gaussian apodized sample gratings for narrowband wavelength selectivity filters

A sample fiber Bragg grating（SFBG） with Gaussian apodization profile is designed and optimized for the narrowband wavelength filter,and the relevant conclusions provide a guide for the further filter fabrication.With the grating length limited,a narrowband（5 GHz） grating filter used in the radio over fiber（ROF） system is fabricated,which has insertion loss of 3.463 dB,sideband suppression of 24.21dB,3 dB bandwidth of 40 pm,and 20 dB bandwidth of 106.3 pm.     

Annealing before gate metal deposition related noise performance in AlGaN/GaN HEMTs

For a further improvement of the noise performance in AlGaN/GaN HEMTs, reducing the relatively high gate leakage current is a key issue. In this paper, an experiment was carried out to demonstrate that one method during the device fabrication process can lower the noise. Two samples were treated differently after gate recess etching: one sample was annealed before metal deposition and the other sample was left as it is. From a comparison of their Ig-Vg characteristics, a conclusion could be drawn that the annealing can effectively reduce the gate leakage current. The etching plasma-induced damage removal or reduction after annealing is considered to be the main factor responsible for it. Evidence is given to prove that annealing can increase the Schottky barrier height. A noise model was used to verify that the annealing of the gate recess before the metal deposition is really effective to improve the noise performance of AlGaN/GaN HEMTs.