一种提高嵌入式系统UBI分区挂载速度的设计方案与研究

根据Linux嵌入式系统UBI分区的挂载原理,在系统关机时预先扫描UBI设备中PEB块的相关头信息,并进行相关压缩处理后存储在UBI分区中的指定物理位置,使得系统下次开机时内核可直接读取预先存储的扫描信息,节省了大量时间.以关机时间换取开机速度的提高,在大量使用UBIFS的基于NAND flash嵌入式系统应用中有很好的优势.     

汽轮机湿蒸汽参数在线计算方法的优化

优化改进了湿蒸汽参数计算的方法,将湿蒸汽计算单独使用的能量平衡法和曲线外推法相结合,通过嵌套式综合迭代,在保证精度的前提下,使迭代收敛速度显著提高.     

Improvement in the volume efficiency of multilayered ceramic capacitors (MLCCs)

An attempt was made to improve the conventional lamination process in the multilayered ceramic capacitors (MLCCs) fabrication by adapting a solvent treatment on the BaTiO₃ green sheets. During the lamination process, additional particle rearrangement in the BaTiO₃ green block was stimulated by solvent treatment. This rearrangement resulted in a more compact structure of the BaTiO₃ green sheets compared to that obtained through the conventional lamination process. The overall thickness of BaTiO₃/Ni/BaTiO₃ laminates was also reduced after solvent treatment. It is suggested that miniaturization in the fabrication of MLCCs can be improved by adapting a solvent treatment during the lamination process.     

低速旋转机器振动测试与评价

低转速机器振动频率低、幅值小,测量困难.在考察转子的平衡情况时,不能仅通过振动幅值的大小来评价转子的平衡状况,而应该通过试加重量计算加重灵敏度以后,再计算出转子残余不平衡量并与标准要求值进行比较和判断.     

谱映像定理在欧氏空间中的另类证明

以泛函分析中的谱映像定量为基础,利用矩阵可以约化为若当型的特点,用一种非常简便的方法证明了欧氏空间中的谱映像定理,给出了一类矩阵指数特征值与原矩阵特征值之间的关系,并给出具体的实例验证结果的有效性.     

The Research and Application of Prediction Control in Multi-variable Control Process

The modern industrial control objects become more and more complicated, and higher control quality is required, so a series of new control strategies appear, applied, modified and develop quickly. This paper researches a new control strategy-prediction control-and its application in Multi-Variable Control Process. The research result is worthy for automatic control in process industry.     

实时广播教学环境下资源同步方案

文中介绍了一种在远程实时广播教学中的资源同步播放方案。该方案使用目前成熟的流媒体技术,配合流媒体脚本技术,可以实现静态教材切换以及动态教材播放,满足了教学的需要。同时可以将教材远程展示的同步时间保持在一个理想的水平内,保证网络教学效果。该方案实现简单,具有很强的实用性、可靠性和可扩展性。     

G.729A+B语音编解码在新一代定点DSPs上的实现

文章介绍了ITU-TG．729A算法与ITU-TG．729B算法配合使用的语音编解码方案，并讨论了其在TI公司最新一代定点数字信号处理器(DSPs)TMS320C6416上实现的关键技术。G．729A是G.729编码器的简化版本，G．729B是带VAD(活动话音检测)的静音压缩算法。两者结合可以有效地降低码率，同时保持很好的合成语音质量。     

Molecular dynamic study for nanopatterning using atomic force microscopy

The atomic force microscopy (AFM)-based nanolithographic technique is currently used to directly machine material surfaces and fabricate nanocomponents for microelectromechanical systems (MEMS) devices. In the current study, three-dimensional molecular dynamic (MD) simulations with potentials based on the Morse function were performed to evaluate the effect of crystallographic factors and process variables on the nanodeformation characteristics of the nanolithography processing of monocrystalline copper. Moreover, the effects of process variables (tool shape, cutting speed, and ploughing depth) on the nanostructural pattern are investigated. The simulation results revealed that the crystal orientation and ploughing direction had a significant influence on varying the forces (cutting force, thrust force, and width-direction force); the nature of the nanodeformation ahead of the tool; and the surface quality of the machined material.