A DCT-based multipoint video composition scheme

针对视频会议应用中传统的像素域多路视频混合方法存在运算复杂度高、画面质量损伤的问题,提出了一种基于压缩域的替代方法,并给出了详细的码流映射算法步骤.该方法按照混合后多画面的空间位置关系,通过对输入的多路码流中宏块编码次序的重排和语法元素的映射,在码流级别将多路视频合成到同一画面中,并采取提前量化策略消除可能出现的二次量化失真,从而可兼具处理速度快和高保真的双重优点.以H.263为例验证了此方法的有效性.实验结果表明,与编解码器级联的方法相比,此方法的峰值信噪比(PSNR)平均提高2dB,运算效率提高百倍以上.此研究工作有望为正在制定的国际视频编码标准H.265贡献一种视频混合解决方案.     

稠密融合卷积神经网络的多模态地基云状分类

为了解决现有的地基云状分类方法对多模态信息利用不充分的问题,有效融合地基云样本的视觉特征与多模态特征,提出稠密融合卷积神经网络的多模态地基云状分类方法.稠密融合卷积神经网络采用卷积神经网络作为视觉子网络提取地基云图像的视觉特征,采用多模态子网络提取多模态特征,在网络内部加入了5个稠密融合模块,用于充分融合视觉特征与多模...     

南美蟛蜞菊洗手液的研制

以南美蟛蜞菊为原料提取制备叶绿素铜钠盐,添加相关试剂后制成具有清洁、杀菌的洗手液。通过正交试验,确定了洗手液的最佳配方:19 g复合表面活性剂、4.05 g羧甲基维生素钠、9 mL甘油、3 mL叶绿素铜钠盐、220 mL蒸馏水、3.51 g柠檬酸、适量香精。     

塑料材料的摩擦学性能研究综述

述了塑料材料摩擦、磨损的研究概况,详细阐述了摩擦因数、载荷、温度、速度、润滑、表面粗糙度pv值和热性能等因素对塑料材料摩擦性能的影响,介绍了磨损的衡量标准和测量方法.     

钢筋工程优化在海上国际花园的应用

结合海上国际花园项目在施工过程中所遇到的钢筋问题,详细阐述了如何正使做用平法解决的,并保证了钢筋工程的施工质量。     

Initial bond formation in thermosonic gold ball bonding on aluminium metallization pads

The morphological features of lift-off footprints on the aluminium metallization pads were investigated to gain an understanding of the effects of bonding parameters on formation of initial bonds during thermosonic gold ball bonding. The obtained results showed that metallurgical bonding initiated at the peripheral areas of the contact area situated along the direction of ultrasonic vibration. Those areas extended inwards with an increase in ultrasonic power. Both the external bonded area and central non-bonded area increased with increasing bonding force. Based on the evolution of footprints, the bonding models were proposed, and the effects of the bonding parameters on the formation of initial bonds were discussed.     

燃烧器管理系统(BMS)的应用与研究

以九江发电厂三期 2× 35 0MW机组的BMS为例 ,介绍了BMS的概念、设计功能及要求。在机组调试过程中 ,对系统设备与控制系统接口以及运行方式方面存在的大量问题 ,提出了严谨而又精准的改进方案 ,并在业主与外方技术代表认同下得到实施 ,为机组的安全、稳定、经济运行奠定了良好的技术基础。     

基于GPS的配电系统多媒体网络RTU的研究与分析

本文提出了一个应用于无人值班变电站的多媒体网络远端监控系统的构想，其核心是基于卫星定时同步的多媒体网络远端监控系统，它是将先进的多媒体技术、GPS技术引入到RTU中，实现多媒体实时监控、变电站安全防卫及IP电话等功能。     

一种基于分布式融合策略的声定位方法

随着城市环境中对各类目标声检测的需求的发展,开发分布式组网声探测手段越来越有必要。然而对于分布式组网声探测技术,当前的声定位方法对全链路的数据传输依赖程度较高,通信传输会带来巨大的带宽压力和很高的通信成本。因此,本文从能耗的角度研究分布式融合声定位的方法,提出通过分布式位置的声事件能量幅度进行目标的融合定位处理,并通过试验测试进行了可行性验证。验证结果表明,无线声感知网络可以在只接收幅度信息且激发少数节点的情况下实现对目标的定位,定位精度的均方根误差(Root Mean Square Error,RMSE)不大于6 m。     

Self‐Powered Trace Memorization by Conjunction of Contact‐Electrification and Ferroelectricity

Triboelectric nanogenerator (TENG) is a newly invented technology that can effectively harvest ambient mechanical energy from various motions with promising applications in portable electronics, self‐powered sensor networks, etc. Here, by coupling TENG and a thin film of ferroelectric polymer, a new application is designed for TENG as a self‐powered memory system for recording a mechanical displacement/trace. The output voltage produced by the TENG during motion can polarize the dipole moments in the ferroelectric thin film. Later, by applying a displacement current measurement to detect the polarization density in the ferroelectric film, the motion information of the TENG can be directly read. The sliding TENG and the single‐electrode TENG matrix are both utilized for realizing the memorization of the motion trace in one‐dimensional and two‐dimensional space, respectively. Currently, the ferroelectric thin film with a size of 3.1 mm² can record a minimum area changing of 30 mm² and such resolution can still be possibly improved. These results prove that the ferroelectric polymer is an effective memory material to work together with TENG and thereby the fabricated memory system can potentially be used as a self‐powered displacement monitor.