20位单片音频数模转换器PCM63P

PCM63P是美国BB公司生产的具有超低失真性能(满量程输出最大为-93dB)的精密20位数模转换器，可应用于低失真频率合成、高级消费品和特殊的数字音频应用等方面。文中介绍了PCM63P的工作原理及应用电路。     

基于TC8830AF的智能语音卡结构与设计

本文描述一种基于８０３１单片机和ＴＣ８８３０ＡＦ语音处理器的ＰＣ机智能语音卡，通过软硬件设计解决了ＰＣ－８０３１－ＴＣ８８３０ＡＦ结构中的通讯问题。该语音卡在进行语音的合成、编辑和播放时，仅占用极少的ＰＣ机ＣＰＵ处理时间，能满足计算机系统进行实时语音合成的要求。     

心电图信号的频域分析

提出了一种简便有效的、由心电图（ECG）曲线提取QRS-T复合波的新方法，从而获得P波（当房颤未发生时）或f波（当房颤时）；利用功率谱、自相关、互相关等信号处理技术，对它进行了处理和分析，特别是，比较了未房颤时和发生房颤时的相关信息的显著差别。     

2400系列数字源表在二极管测试中的应用

本文章将介绍Kethley2400系列数字源表在二极管测试中的应用及相应的编程算法。     

Differential geometry based active fault tolerant control for aircraft

This work shows how to use a differential geometry tool to design a novel nonlinear active fault tolerant flight control system for aircraft. The proposed control scheme consists of two main subsystems: a controller, which is designed for the nominal plant, and a fault detection and diagnosis module, which provides fault estimation. A further feedback loop exploits the fault estimation to accommodate faults affecting the system. The estimate convergence and the stability of the active fault tolerant flight controller are theoretically proved. Finally, high fidelity simulations show the effectiveness of the scheme.     

氟橡胶双酚AF/BPP硫化体系的研究

研究了硫化剂双酚AF、促进剂BPP用量及硫化温度对氟橡胶硫化特性的影响。结果表明：双酚AF和BPP的用量主要影响胶料的交联密度及硫化时间，并对加工性能有一定的影响；硫化温度的提高会缩短焦烧时间和正硫化时间．但有使交联密度下降的趋势。     

Al2O3 coated glass by aerosol deposition with excellent mechanical properties for mobile electronic displays

Al₂O₃ thin film was deposited on Gorilla glass using an aerosol deposition method to improve the mechanical property of cover glass for mobile electronic device. The deposited Al₂O₃ film (approximately 1 μm thick) was a polycrystalline structure and showed a high light transmittance of approximately 90% in the visible light region. The CIE color space (L*a*b) measurement also showed a characteristic corresponding to the acceptable optical range of the cover glass. Further, it was confirmed that the bending strength improved by 10 %, as compared with bare Gorilla glass (from 6970 kgf/cm² to 7704 kgf/cm²), and the Vickers hardness increased to approximately 1700–2000 HV, as compared with that of Gorilla glass (<700 HV). Owing to the improved mechanical properties, the Al₂O₃ thin film exhibited good anti-scratch properties and is expected to be applied to the cover glass of various display products.     

紫外分光光度法测定双酚 AF

碱性条件下,双酚 AF 紫外光谱的吸收峰会发生红移,从225 nm 移至248 nm,据此建立了简单、灵敏、快捷、选择性较好的测定双酚 AF 可见分光光度法,并研究了氨水用量、反应时间、反应温度对吸光度的影响。结果表明：双酚 AF 的最大吸收波长为248 nm,线性范围是0.6～7．2 mg／L,相关系数 r 为0.9998,为检测食品塑料包装中双酚 AF 的残留提供了新的实验方法。     

基于μC/OS-Ⅱ的设备管理层设计

针对目前μC/OS-Ⅱ操作系统没有驱动设备管理部分的现状,通过建立驱动设备列表和驱动程序列表来分别对设备和驱动程序进行管理,实现了设备管理层的设计方案。设备管理系统分为三个层次：上层提供了统一的访问接口函数,中间层对设备链表和驱动程序列表进行管理同时将上层的接口函数定位到底层对应的驱动程序,底层直接完成设备的各项操作。另外,给出了在LPC2400硬件环境下串行接口的管理实例。应用结果表明,该系统具有很强的通用性和可移植性。     

Optimal cooperative beamforming design schemes  for AF MOMO two way relay channels

In this paper,beamforming parameters in multiple input multiple output (MIMO) two-way relay channels (TWRCs) are designed.We investigate three communicating scenarios,in which,the source nodes are all ...